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WO2018138068A1 - Procédé et appareil d'exploitation d'un récepteur de signal numérique - Google Patents

Procédé et appareil d'exploitation d'un récepteur de signal numérique Download PDF

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Publication number
WO2018138068A1
WO2018138068A1 PCT/EP2018/051513 EP2018051513W WO2018138068A1 WO 2018138068 A1 WO2018138068 A1 WO 2018138068A1 EP 2018051513 W EP2018051513 W EP 2018051513W WO 2018138068 A1 WO2018138068 A1 WO 2018138068A1
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WO
WIPO (PCT)
Prior art keywords
receiver
channels
channel
antenna
mode
Prior art date
Application number
PCT/EP2018/051513
Other languages
English (en)
Inventor
Ali Louzir
Jean-Yves Le Naour
Original Assignee
Thomson Licensing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP17305096.4A external-priority patent/EP3355492A1/fr
Application filed by Thomson Licensing filed Critical Thomson Licensing
Publication of WO2018138068A1 publication Critical patent/WO2018138068A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

Definitions

  • DTT Digital Terrestrial Television
  • Using small size indoor antenna rather than roof-top antenna would improve the user experience by simplifying the product, reducing the wiring and making the installation easier in the building.
  • using small size indoor antennas for receiving DTT signals raises at least three challenges.
  • the total extra-loss may vary from typically 20 dB up to 40 dB or more depending on the height, the type of building and the orientation regarding the broadcast tower.
  • the frequency selective multipath fading worsen the signal strength and interferences issues. It is generally not easy for a user to find the best place for the localization of the product/antenna within the home, in particular when taking into account the above issues. A method for automatic antenna/product installation within the home is therefore needed.
  • a salient idea of the present principles is to use a smart antenna system embedded in a digital signal receiver, the smart antenna system being operable in an omnidirectional mode and in a plurality of directional modes, the smart antenna system being further associated with a two steps installation method of the digital signal receiver.
  • the first step of the installation method comprises determining an indoor location for positioning the digital signal receiver based on measuring the Received Signal Strength (RSS) of the available RF channels received through an omnidirectional radiation pattern of the smart antenna system.
  • the second step of the installation method comprises configuring the smart antenna system, located at the determined location by the selection of a directional mode for each channel, based on a signal quality such as a signal to noise ratio, a bit error rate or any combination thereof.
  • the smart antenna system can also be advantageously leveraged by a further optional step of dynamic optimization of the signal quality in order to take into account dynamic changes of the propagation conditions.
  • a digital signal receiver device comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes.
  • the digital signal receiver comprises a processor configured to:
  • the processor is further configured to measure the first signal quality of each channel for each directional mode of the antenna.
  • the digital signal receiver further comprises a first RF receiver connected to the antenna via a selector, the selector being adapted to configure the antenna in a first mode associated with the first RF receiver, the first mode being among the omnidirectional mode and the plurality of directional modes.
  • the digital signal receiver further comprises a second RF receiver connected to the antenna via the selector, the selector being further adapted to configure the antenna in a second mode associated with the second RF receiver, in parallel of the first mode associated with the first RF receiver, the second mode being among the omnidirectional mode and the plurality of directional modes.
  • the first RSS is measured for a first channel by the first receiver in parallel of a second RSS being measured by the second receiver for a second channel.
  • the first signal quality is measured for a first channel by the first receiver in parallel of a second signal quality being measured by the second receiver for a second channel.
  • the first RF receiver is configured to receive a TV program from the antenna, being configured in a first directional mode corresponding to a channel of the TV program, the second RF receiver being configured to sequentially configure the antenna in other directional modes and to measure the second signal quality of the channel of the TV program for each other directional mode.
  • the processor is further configured to set the antenna in a second directional mode in case the second signal quality measured by the second RF receiver as the second directional mode is set, is of higher quality than the first signal quality.
  • the first and the second signal quality comprise a signal to noise ratio value.
  • the first and the second signal quality comprise a bit error rate value.
  • the set of channels corresponds to a subset of available channels, and is configurable by a user.
  • an antenna adapted to a digital signal reception is also disclosed.
  • the antenna is operable in an omnidirectional mode and in a plurality of directional modes, the omnidirectional mode being used for measuring a received signal strength for a set of channels at various locations so as to determine a location, a directional mode of the antenna being determined for each channel of the set of channels based on measuring a signal quality of each channel at the determined location.
  • a method for operating a digital signal receiver comprises an antenna operable in an omnidirectional mode and in a plurality of directional modes.
  • the method comprises:
  • the method further comprises: - receiving a TV program from the antenna, being set in a first directional mode corresponding to a channel of the TV program,
  • a computer program for operating a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes is also disclosed.
  • the computer program comprises program code instructions executable by at least one processor for:
  • the disclosed principles are directed to a computer program product comprising instructions of program code for execution by at least one processor to perform the disclosed method.
  • a non-transitory computer-readable storage medium storing computer-executable program code instructions to operate a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes is also disclosed.
  • the program code instructions are executable by at least one processor for:
  • a digital signal receiver device comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes.
  • the digital signal receiver comprises a processor configured to:
  • the processor is further configured to further select the location based on a set of quality indicator values determined for the set of channels at the different locations, with the antenna configured in the omnidirectional mode, the selected location corresponding to quality indicator values determined for that location for the at least part of the set of channels and meeting a second criterion, wherein a quality indicator value is determined for a given channel of the set of channels, by dividing a RSS value measured for the given channel of the set of channels by an average of a set of noise levels determined for a subset of the set of channels.
  • a noise level of the set of noise levels is determined for each channel of the subset of the set of channels by dividing a measured RSS value of the channel by a signal quality of the channel.
  • the signal quality belongs to a set at least comprising a Signal to Noise Ratio, SNR, and Modulation Error Ratio, MER.
  • the set of noise levels is determined for the subset of the set of channels prior to measuring the RSS value of the given channel.
  • the given channel is not included in the subset of the set of channels.
  • the digital signal receiver further comprises a first RF receiver connected to the antenna via a selector, the selector being adapted to configure the antenna in a first mode associated with the first RF receiver, the first mode being among the omnidirectional mode and the plurality of directional modes.
  • the digital signal receiver further comprises a second RF receiver connected to the antenna via the selector, the selector being further adapted to configure the antenna in a second mode associated with the second RF receiver, in parallel of the first mode associated with the first RF receiver, the second mode being among the omnidirectional mode and the plurality of directional modes.
  • the set of RSS values for the set of channels are obtained by measuring a first RSS value for a first channel by the first RF receiver in parallel of measuring a second RSS value by the second RF receiver for a second channel.
  • the first signal quality of a first channel is obtained by the first RF receiver in parallel of a second signal quality of a second channel being obtained by the second RF receiver.
  • the set of noise levels for the set of channels is obtained by measuring a first RSS and obtaining a first signal quality of a first channel by the first RF receiver in parallel of measuring a second RSS and obtaining a second signal quality of a second channel by the second RF receiver.
  • the set of noise levels for the set of channels is obtained by measuring a first RSS and obtaining a first signal quality of a first channel by the first RF receiver in parallel of measuring a second RSS and obtaining a second signal quality of a second channel by the second RF receiver.
  • the first RF receiver is configured to receive a TV program from the antenna, being configured in a first directional mode corresponding to a channel of the TV program, the second RF receiver being configured to sequentially configure the antenna in other directional modes and to obtain the second signal quality of the channel of the TV program for each other directional mode.
  • the processor is further configured to set the antenna in a second directional mode in case the second signal quality obtained for the second RF receiver as the second directional mode is set, is of higher quality than the first signal quality.
  • the first and the second signal quality belong to a set at least comprising a signal to noise ratio value and a bit error rate value.
  • the set of channels corresponds to a subset of available channels, and is configurable by a user.
  • a further digital signal receiver device comprises:
  • o tune the RF receiver to a given channel; o determine a quality indicator of the given channel, by dividing a RSS value measured for the given channel by an average of a set of noise levels determined for a plurality of channels; o display the quality indicator of the given channel with an indication of whether the quality indicator meets a second criterion.
  • a method for operating a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes.
  • the method comprises:
  • determining a directional mode of the antenna for operating at the selected location wherein a signal quality of each channel of the set of channels is obtained for each directional mode at the selected location, the determined directional mode of the channel corresponding to the highest first signal quality of the channel.
  • a computer program product for operating a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes is disclosed.
  • the method comprises program code instructions executable by at least one processor for:
  • the present embodiments may be employed in any combination or sub-combination.
  • the present principles are not limited to the described variants, and any arrangement of variants and embodiments of a smart antenna system can be used.
  • the present principles are not limited to the described omnidirectional and directional beam examples.
  • the present principles are not further limited to the described signal quality metrics, and any other signal quality metric (measured or estimated from measured parameters are compatible with the disclosed principles.
  • the present principles are not further limited to the described receivers comprising an integrated antenna and are applicable to any other receivers connected to an external indoor antenna.
  • any characteristic, variant or embodiment described for the digital signal receiver device is compatible with the further digital signal receiver device, the antenna, the smart antenna system the method for operating the digital signal receiver device, a computer program product comprising program code instructions and with a non-transitory computer-readable storage medium storing program instructions for performing the method in any variant.
  • FIG. 1 a describes a method for operating a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes, according to a specific and non-limiting embodiment of the disclosed principles
  • Figure 1 b details a step of the method of Figure 1 a, according to a specific and non-limiting embodiment of the disclosed principles
  • FIG. 2 details another step of the method of Figure 1 a, according to a specific and non-limiting embodiment of the disclosed principles
  • FIG. 3a describes a processing device comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes, according to a specific and non-limiting embodiment of the disclosed principles
  • FIG. 3b describes a processing device for displaying a quality indicator of a given channel, according to a specific and non-limiting embodiment of the disclosed principles
  • FIG. 4a describes an antenna operable in an omnidirectional mode and in a plurality of directional modes, according to a specific and non- limiting embodiment of the disclosed principles
  • FIG. 4b represents an exemplary architecture of the processing device of figure 3 according to a specific and non-limiting embodiment of the present principles.
  • Figure 1 a describes a method for operating a digital signal receiver comprising an antenna operable in an omnidirectional mode and in a plurality of directional modes, according to a specific and non-limiting embodiment of the disclosed principles.
  • the digital signal receiver is for example a Digital Terrestrial Television receiver, but any kind of receiver adapted to receive wireless digital signals from a set of radio frequency channels is compatible with the disclosed principles.
  • the term channel is used throughout the description aiming at designating a Radio Frequency (RF) channel.
  • Digital Terrestrial Television is for example compliant with the American ATSC (Advanced Television Systems Committee) standard in any of its version, particularly the ATSC 3.0 version based on the OFDM (Orthogonal Frequency Division Multiplexing) technology.
  • Digital Terrestrial Television is compliant with the DVB-T (Digital Video Broadcast - Terrestrial) standard in any of its version.
  • the antenna is integrated in the digital signal receiver, for example as a part of the main printed circuit board of the digital signal receiver and does not need to be positioned independently from the digital signal receiver.
  • the digital signal receiver further comprises a network interface for connection to a home network such as for example and without limitation an Ethernet, WiFi, or Powerline network.
  • the network interface is for example configured to transmit over the home network a received television program to another device connected to the home network.
  • a home network such as for example and without limitation an Ethernet, WiFi, or Powerline network.
  • the network interface is for example configured to transmit over the home network a received television program to another device connected to the home network.
  • such digital signal receivers may be advantageously located in the attic of the home, being remotely configured from the network interface and benefiting of some more height (because being closer to the roof, but remaining protected from bad weather conditions).
  • DTT indoor reception being sensitive to multipath, is highly depending on a location of the antenna. Identifying an indoor location with a good reception is of primary importance. Given the important number of potential locations and channels to test, the time response and the overall search time must be minimized and an adequate interface should be provided to the user, to facilitate his installation.
  • a salient idea is to associate a smart antenna system to a multi-step method comprising a first S1 and a second S2 step of installation of the digital signal receiver, wherein the smart antenna system is operable in an omnidirectional mode and in a plurality of directional modes.
  • the smart antenna system is further configurable to operate several modes sequentially. For example, the smart antenna system is configurable for operating first in the omnidirectional mode, as described in the step S1 , and then in a plurality of directional modes, as described in the step S2.
  • the smart antenna system is further configurable to operate at least two modes in parallel, and to direct the received power corresponding to each mode towards a dedicated output. For example, the smart antenna system is configurable to operate the omnidirectional mode twice in parallel, or to operate several different directional modes in parallel.
  • the method further comprises an optional third step S3 of dynamically improving a signal quality of the digital signal receiver.
  • Step S1 Determining a best location for positioning the digital signal receiver in the home
  • the idea is to use the power level of the RF channel received through the omnidirectional radiation mode of the antenna as an indicator of the average received signal strength of that channel at a given location within the home.
  • a Received Signal Strength is measured from the antenna operated in the omnidirectional mode, for a set of channels at various indoor locations.
  • Using the omnidirectional mode advantageously allows the reception of all the existing channels from all broadcast towers with equal antenna gain, making thus possible to fairly compare all the various locations without orientation discrimination.
  • the level of the received RF power is advantageously deducible from the value of the AGC (Automatic Gain control) available at the tuner/demodulator interface.
  • a high value of the AGC implies low signal power while a low value implies a high signal power at the tuner stage.
  • Modern tuners provide high dynamic ranges (typically over 80dB) of the AGC with settling time of the AGC of few tens of milliseconds.
  • the antenna is configured in the omnidirectional mode all along the step 1 .
  • a displayable user interface is used so as to assist a user in the installation step S1 .
  • the user for example triggers received signal strength measurements from the user interface of the digital signal receiver at each location among a set of candidate locations around the home.
  • the displayable user interface provides a feedback to the user with regards to the measured values of received signal strength for the channels at the candidate locations.
  • bar graphs are used to instantaneously display average power information of the set of channels at a candidate location.
  • a threshold value is determined by the digital signal receiver and is used by the user interface to change the color of a bar graph, depending on whether the measured received signal strength is above the threshold value (i.e. display the bar in green) or below the threshold value (i.e.
  • the threshold value is for example determined to take into account the minimum required signal level at the antenna input for proper reception. In another example, the threshold value takes into account the fact that the omnidirectional mode input is followed by a power splitter for feeding two parallel tuner/demodulator chains. Also average improvement brought by the use of a directional mode of the antenna (i.e. antenna directional mode gain as well as multipath and interferences rejection gain), are taken into account for the estimation of this threshold value.
  • the set of channels on which the received signal strength is measured by the digital signal receiver at various candidate locations is a subset of the available channels and corresponds to a list of preferred channels.
  • the list of preferred channels is for example determined from a list of preferred TV programs configured by a user from the user interface. Taking the United States as an example, a channel of 6 MHz includes between 1 and 6 programs with an average of 3 programs per channel. A channel comprising a preferred program as configured by the user is determined as a preferred channel.
  • a priority order is also configured by the user for the preferred programs / channels via the user interface.
  • Configuring a list of preferred TV programs with an optional priority order is advantageous as it allows displaying the measured received signal strength according to the priority as configured by the user, assisting the user in deciding what is the location fitting the greatest number of preferred channels / programs.
  • a location is determined by the digital signal receiver, wherein an acceptable RSS value has been measured, at that location, for at least a subset of the channels.
  • the subset of the channels is for example a list of preferred channels corresponding to a list of preferred TV programs.
  • the user After having triggered a measurement of RSS values of a set of channels on the digital signal receiver positioned at different candidate locations, the user completes the installation process by positioning the digital signal receiver in the location for which an acceptable RSS value has been measured, for example thanks to the display of the bar graphs described above in any of the variants.
  • the location is determined as the location at which, for example, the installation process is terminated from the user interface.
  • the digital signal receiver automatically determines a location among the candidate locations based on the RSS values measured at the different candidate locations for at least a subset of the channels. For example, a location is selected if the RSS values measured at that location meet a first criterion for at least the subset of channels. More precisely, the location, also called best location, is determined for example from a metric calculated from the RSS values measured for the channels at the different candidate locations. There is for example a RSS value for each channel measured at each candidate location. In addition, a priority is associated with each channel. The priority is for example an integer, being 0, 1 or any value in an interval of values.
  • Setting all the priorities to 1 represents considering all the available channels in the metric calculation. Setting the priority to 1 for some channels and to zero to other channels represents considering a set of preferred channels in the metric calculation. Setting the priority of the channels to a value greater than 1 for the preferred channels represents allocating a further prioritization among the preferred channels in the metric calculation.
  • the metric for selecting the best channel is for example a weighted sum of the RSS values, wherein the weights are the priorities in any of their variants. In that example, the location corresponding to the highest metric is selected as the best location. In another example, the fact that a RSS value is above a threshold value is further taken into account. For example the location for which the greatest number of preferred channels have a measured RSS value above a threshold value is selected as the best location.
  • any combination of the previous examples and more generally any technique for automatically selecting a best location among candidate locations from RSS values measured at the different candidate locations for at least a subset of the channels is compatible with the disclosed principles.
  • the selected location is for example suggested to the user and validated by the user via the user interface. More generally a location is selected based on a set of RSS values measured for a set of channels at different locations, with the antenna configured in the omnidirectional mode. More precisely, at each location among candidate locations, a set of local RSS values is obtained, one local RSS value per channel of the set of channels at a given location.
  • the location is selected among the candidate locations according to a first criterion, that is met by at least a subset of the set of local RSS values measured at that location for at least a subset of the channels.
  • the first criterion does not need to be met by all the channels (i.e. all the values) but only for the RSS values corresponding to the subset of the channels.
  • the variants previously described are possible examples of such first criterion.
  • Possible criteria to be met by the subset of local RSS values for a location to be selected include without limitation: all local RSS values of the subset to be above a first value, at least a given number of local RSS values to be above the value, a weighted sum of the local RSS values of the subset to be above a second value (the sum being weighted by channel priorities), no local RSS value to be below a third value, no more than another given number of local RSS values to be below the third value, ...
  • a typical number of seventy-five programs corresponds to typically twenty-five RF channels.
  • the refreshment period of scanning all the RF channels is equal for example to seven hundred fifty milliseconds leading to almost instantaneous assessment (at least in less than one second) of each location within the home.
  • a first RF receiver is used in parallel to a second RF receiver, each RF receiver comprising a RF tuner and a demodulator. This allows to divide by two the time needed for measuring a RSS for all the available channels, or for the preferred channels.
  • the first RF receiver measures the first RSS of a first subset of channels in parallel to the second RF receiver measuring a second RSS of a second subset of channels, the aggregation of the first and the second subsets of channels, corresponding to all the available channels, or all the preferred channels.
  • Figure 1 b describes the step S1 of the method of Figure 1 a, according to a specific and non-limiting embodiment of the disclosed principles.
  • measuring RSS values with the antenna configured in the omnidirectional mode allows to quickly determine an amount of energy received at a given location, so as to fairly compare received amounts of energy at various locations without orientation discrimination.
  • measuring only the RSS value for a set of channels is not sufficient to assess a quality of reception as it may not be sufficiently representative of reception conditions at various locations. For example, in presence of a nearby interfering transmitter, excessive signal level, including out of band signal may induce significant in-band noise due mainly to amplifier/tuner non-linearity.
  • the reception conditions, due to interference may be very bad.
  • out of band emissions of an increasing number of licensed and unlicensed devices operating in the White Spaces may increase the noise floor, in particular in indoor conditions as they might be within few meters from the receiver.
  • a salient idea is to determine, for the set of channels at various locations, in addition to the set of RSS values, a set of quality indicator values, that are more representative of reception conditions, while remaining efficient (i.e. fast) to determine.
  • the quality indicator values are determined in a short time compared to a more sophisticated signal quality as described in steps S2 and/or S3.
  • Some signal quality metrics such as for example and without limitation a Signal to Noise Ratio (SNR) or a Modulation Error Ratio (MER) are more representative of a reception condition than only the RSS.
  • SNR is a measure that compares the level of a desired signal to the level of background noise (SNR is noted C/N, C representing the signal level, N representing the background noise).
  • the MER is a measure used to quantify the performance of a digital transmitter or receiver in a communications system using digital modulation, it is often noted C/(N+I), C being the signal level, N the background noise and I the Interference level.
  • a MER is a bit more complicated to determine than a SNR, but is also more realistic (because taking the Interferences into account).
  • the signal quality metrics can be measured for a channel, but requires more time than only measuring a RSS value.
  • a background noise is estimated by performing a few noise measurements at the beginning of the process in a few channels, followed by an estimation of the signal quality (SNR or MER) of other channels based on only a measured RSS value and the estimated background noise. Estimating the signal quality for the other channels, based only the RSS and background noise is advantageous as it is faster than measuring the signal quality for every channel of the set of channels.
  • the background noise is estimated by measuring a RSS value and obtaining a signal quality value in each channel of a subset of channels, for example comprising 3 channels, by determining and averaging noise levels.
  • the quality signal is measured or estimated from other measured metrics.
  • the SNR or the MER may either be directly measured by a RF receiver, or estimated from other measured metric such as for example and without limitations a number of uncorrected packets (calculable from a packet error rate), or a measured EVM (Error Vector Magnitude)
  • noise levels of different channels are determined in parallel by obtaining SNR and RSS values for different channels by different RF receivers in parallel.
  • the set of noise levels for the set of channels is obtained by measuring a first RSS value and obtaining a first signal quality value for a first channel by the first RF receiver in parallel of measuring a second RSS value and obtaining a second signal quality value by the second RF receiver for a second channel.
  • a first noise level of the set of noise levels is then obtained by dividing the measured first RSS value by the obtained first signal quality value.
  • a second noise level of the set of noise levels is then obtained by dividing the measured second RSS value by the obtained second signal quality value.
  • the disclosed principles are not limited to two RF receivers in parallel, and advantageously the number of noise levels determined in parallel corresponds to the number of RF receivers available in parallel in the digital receiver.
  • a location is selected among a set of candidate locations based on a set of Received Signal Strength RSS values measured for a set of channels at different locations of the set of candidate locations, with the antenna configured in the omnidirectional mode.
  • a location is selected if the RSS values measured at that location for at least a part of the set of channels meet a first criterion, according to any variant described above.
  • the location is further selected based on a set of quality indicator values determined for the set of channels at the different locations, with the antenna still configured in the omnidirectional mode.
  • a location is selected if the quality indicator values determined for that location and for the at least part of the set of channels meet a second criterion.
  • the set of quality indicator values are described below as a set of estimated SNR values, but any other type of indicator value such as for example an estimated MER is compatible with the disclosed principles.
  • a set of local SNR values are estimated, one estimated local SNR value per channel of the set of channels at a given location.
  • the set of noise levels is determined for the subset of the set of channels and the background noise is estimated prior to measuring the RSS value of a given channel for estimating the local SNR value of that given channel.
  • the given channel is not comprised in the subset of the set of channels (on which the background noise estimation is based). Indeed, for channels belonging to the subset of channels, the local SNR value is measured and does not need to be estimated.
  • the location is selected among the candidate locations according to a second criterion, to be met by at least a subset of the set of local SNR values estimated for that location and for at least a subset of the channels.
  • the second criterion does not need to be met by all the channels (i.e. all the values) but only for the estimated SNR values corresponding to the subset of the channels.
  • the variants previously described are possible example of such first criterion.
  • Possible criteria to be met by the subset of estimated local SNR values for a location to be selected include without limitation: all estimated local SNR values of the subset to be above a first value, at least a given number of estimated local SNR values to be above the value, a weighted sum of the estimated local SNR values of the subset to be above a second value (the sum being weighted by channel priorities), no estimated local SNR value to be below a third value, no more that another given number of estimated local SNR values to be below the third value, ...
  • a reception threshold may be defined, and indicate that a channel for which the estimated SNR is above the threshold is very likely to be received in good conditions by the digital signal receiver.
  • the second criterion may also be based on a number of channels among the preferred channels for which the estimated SNR is above the threshold, that number being required to be above a given number or ratio.
  • the same criterion may be used based on number of received programs instead of the number of channels (considering each channel comprises a plurality of programs). According to this specific and non-limiting embodiment, both the first and the second criteria need to be met for a location to be selected.
  • Measuring a RSS using an omnidirectional antenna while allowing a practical and quick identification of a good place for the localization of the digital signal receiver within the home, does not guarantee the best reception quality, in particular in presence of multipath and interferers.
  • an interfering signal or a multipath could improve the received signal power while it might degrade the reception quality.
  • a directional radiation pattern even moderate helps improving the desired signal level, reducing interferences and multipath, therefore leading to better overall performances, sometimes even with lower received power.
  • signal quality being measured
  • the disclosed principles are also applicable to signal quality being estimated based on other measured metrics such as for example and without limitation a number of uncorrected packets (calculable from a packet error rate), or a measured EVM (Error Vector Magnitude)
  • a directional mode of the antenna is determined responsive to measuring a first signal quality of each channel of the set of channels at the determined location.
  • the set of channels is a subset of the available channels and correspond to a list of preferred channels as described above.
  • the first signal quality is measured by a first RF receiver for each channel and for each directional mode of the antenna.
  • the first RF receiver comprises a tuner and a demodulator including AGC adjustment, Intermediate Frequency amplification, interferences rejection, multipath cancellation and Forward Error Correction, leading to an optimal SNR (Signal to Noise Ratio (SNR) and/or BER (Bit Error Rate).
  • the first signal quality comprises a SNR.
  • the directional mode of the antenna for a given channel is selected based on the SNR measured among the directional modes for that given channel.
  • the directional mode of the antenna for a given channel is selected as the directional mode for which the highest SNR has been measured among the other directional modes for that given channel.
  • the directional mode for a given channel is selected as a directional mode for which the SNR has been measured above a value for that channel.
  • the first signal quality comprises a BER.
  • the directional mode of the antenna for a given channel is selected based on the BER measured among the directional modes for that given channel.
  • the directional mode of the antenna for a given channel is selected as the directional mode for which the lowest BER has been measured among the other directional modes for that given channel.
  • the directional mode for a given channel is selected as a directional mode for which the BER has been measured below a value for that channel.
  • any combination of the first and second variants is compatible with the disclosed principles.
  • any technique for selecting a directional mode for a channel based on the measured SNR and/or BER values for other directional modes for that channel are compatible with the disclosed principles.
  • the first signal quality in any of its variant, is measured for a first channel by the first RF receiver in parallel of a second signal quality being measured by a second RF receiver for a second channel.
  • Any variant for the second signal quality similar to the variants of first signal quality is compatible with the disclosed principles. Measuring a SNR for a channel takes a few hundred of milliseconds
  • the duration time of the step S2 of the installation, using a single RF receiver is about: - forty seconds, with a first signal quality based on a SNR only - ten minutes, with a first signal quality level based on a BER only.
  • durations are advantageously divided by two thanks to the use of the two RF receivers in parallel which finally leads to a typical duration for the installation of all the channels of about twenty seconds (respectively five minutes) when using SNR (respectively BER) as first (and second) signal quality.
  • Step S3 (optional): Dynamic improvement of the received signal
  • step S3 of antenna diversity advantageously leverages a second optional RF receiver in order to improve the stability of the reception of the first RF receiver.
  • a TV program is received from the antenna and the first receiver, the antenna being set in a first directional mode corresponding to a channel of the TV program.
  • the received TV program is further transmitted to another device of the home via a network interface.
  • the antenna is sequentially set in other directional modes and a second signal quality of the channel is measured for each other directional mode by a second RF receiver, so as to identify another directional mode associated to a second signal quality of higher quality than the first signal quality for that TV program.
  • Figure 2 describes the sub-step S32 of the method of Figure 1 with more details, according to a specific and non-limiting embodiment of the disclosed principles.
  • the first signal quality is denoted SQ1
  • the second signal quality is denoted SQ2
  • directional modes are denoted by the letter p designating for example numbers, and corresponding to the selected directional beam 1 1 , 1 2, 13, 14, 15, 16, 17, 18 for a given directional mode, as described later in Figure 4a.
  • Any variant described in the disclosed principles for the first and second signal quality are applicable to SQ1 and SQ2
  • the sub-step S32 comprises two distinct loops operating simultaneously.
  • the first loop S321 , S322, S323, S324 also called receiving mode is based on the first RF receiver and is devoted to the decoding of the channel/program to be rendered to a user, the antenna 2 being set to a first directional mode, also denoted current mode in Figure 2.
  • the first directional mode is for example the directional mode that was determined for that channel during the installation step S2 previously described. In another example, the first directional mode is the directional mode that was used the last time the same channel was received by the digital signal receiver.
  • the second loop S326, also called scanning mode is based on the second RF receiver and is devoted to the scanning of all remaining directional modes, in order for the digital signal receiver to switch to the best one when required, the objective being to maintain the optimum reception quality.
  • the corresponding configuration including the RF channel and the first directional mode (i.e. current mode) is retrieved.
  • the antenna 2 and the first RF receiver are configured according to the current mode.
  • the first signal quality metric SQ1 of the current mode is continuously tracked in the sub- step S321 , and is denoted SQ1 .
  • SQ1 is evaluated against a predetermined level denoted Threshold depending on the variant of signal quality (SNR, BER, any combination). Threshold is determined so as to preserve a good audio/video decoding even in case of a reasonable degradation of a reception quality.
  • Threshold represents a quality level, wherein the higher the Threshold, the higher the quality of the link. If the first signal quality SQ1 is of higher quality than the predetermined level, the current mode selected for program decoding is kept. In parallel of the first loop, all directional modes except the current mode are scanned by the second RF receiver in the second loop S326. Scanning these directional modes comprises setting the antenna 2 in one of these directional modes, measuring a second signal quality of the channel for that that directional mode, storing in memory the measured second signal quality associated with that directional mode and repeating the process (set, measure, store) with another directional mode.
  • the first signal quality SQ1 is further evaluated against the second signal quality SQ2(p) corresponding to other directional modes p, and measured by the second RF receiver.
  • the current mode is switched to the directional mode p for which the measured second signal quality SQ2(p) is of higher quality than the first signal quality SQ1 .
  • the current mode is switched to the directional mode corresponding to the highest signal quality.
  • the current mode is kept, and the first signal quality SQ1 is further measured in the sub-step S321 .
  • Evaluating the first signal quality against a predetermined level in the sub-step S322 before evaluating the first signal quality against the second signal quality of other directional modes in the sub-step 323 is advantageous as it allows keeping the current mode is case the first signal quality is at least corresponding to the predetermined level, and to avoid frequent switching between directional modes. Indeed in case of frequent switching between different directional modes of similar performance, the risk of experiencing micro cut in the overall signal decoding significantly increases.
  • FIG 3a describes a processing device 1 as a digital signal receiver, according to a specific and non-limiting embodiment of the disclosed principles.
  • the processing device 1 is for example a Digital Terrestrial Television receiver, but as mentioned above any kind of receiver adapted to receive wireless digital signals is compatible with the disclosed principles.
  • the processing device 1 comprises an antenna 2 operable in an omnidirectional mode and in a plurality of directional modes.
  • the antenna 2 comprises a reconfigurable radiating system, i.e. an antenna capable of modifying dynamically its radiation properties in a controlled and reversible manner.
  • the antenna for example comprises inner mechanisms (such as RF switches, varactors, etc ..) and/or tunable materials that enable controllable redistribution of the RF currents over the antenna surface and produce reversible modifications over its radiation patterns.
  • inner mechanisms such as RF switches, varactors, etc ..
  • tunable materials that enable controllable redistribution of the RF currents over the antenna surface and produce reversible modifications over its radiation patterns.
  • these reversible modifications of the antenna radiation properties are further described as the omnidirectional mode and the plurality of directional modes.
  • the omnidirectional mode corresponds to an omnidirectional radiation pattern 10, adapted to receive an equivalent power from all directions.
  • the antenna 2 is further operable in eight different directional modes, each directional mode corresponding to a moderately directional beam 1 1 , 12, 13, 14, 15, 16, 17, 18.
  • Directional beams 1 1 , 1 2, 13, 14, 1 5, 1 6, 17, 18 are determined in such a way that each directional beam 1 1 , 12, 13, 14, 15, 16, 17, 18 corresponds to a different direction for receiving a greater amount of power, and that all directions are covered by a juxtaposition of all the directional beams 1 1 , 12, 13, 14, 15, 16, 17, 18 as illustrated in Figure 4a.
  • An antenna operable in an omnidirectional mode in addition to a plurality of directional modes is advantageous over an antenna operable only in a plurality of directional modes as it allows to fairly and quickly compare a set of various locations by evaluating the received power of a set of channels from all broadcast towers with an equal antenna gain at each location.
  • the comparison is fair as the omnidirectional antenna allows measuring the received power without orientation discrimination.
  • the comparison is fast as based on a RSS which can be measured in a very short period of time compared to other more sophisticated signal quality measurements.
  • the processing device 1 further comprises a selector 100 adapted to configure the antenna 2 in a mode among the omnidirectional mode and the plurality of directional modes.
  • a selector 100 adapted to configure the antenna 2 in a mode among the omnidirectional mode and the plurality of directional modes.
  • the antenna 2 When the antenna 2 is configured in the omnidirectional mode, its radiating system is reconfigured so as to receive equivalent power from all directions via the omnidirectional radiation pattern 10.
  • the antenna 2 When the antenna 2 is configured in a directional mode, its radiating system receives greater power from a specific direction corresponding to a direction of the directional beam 1 1 , 12, 13, 14, 1 5, 16, 17, 1 8.
  • the selector 100 further comprises at least one switch, for example a single pole multiple throw (SPMT) switch, connected to the antenna 2. The switch is capable of switching at least one input connected to the antenna 2 to a first output.
  • SPMT single pole multiple throw
  • the switch comprises eight inputs, and one output, each input corresponding to a directional mode of the antenna 2.
  • one of the eight inputs also corresponds to the omnidirectional mode of the antenna.
  • the switch comprises at least one additional input corresponding to the omnidirectional mode.
  • the switch is configurable to switch any of the inputs corresponding to any of the antenna 2 modes to the first input.
  • a combination of at least the antenna 2 and the selector 100 are an example of a smart antenna system.
  • the processing device 1 further comprises a first RF receiver 101 connected to the antenna 2 via the first output of the selector 100, the selector 100 being adapted to configure the antenna 2 in a first mode associated with the first RF receiver 101 , the first mode being among the omnidirectional mode and the plurality of directional modes.
  • the first RF receiver 101 comprises a first tuner and a first demodulator including AGC adjustment, Intermediate Frequency amplification, interferences rejection, multipath cancellation and Forward Error Correction, leading to an optimal SNR (Signal to Noise Ratio (SNR) and/or BER (Bit Error Rate).
  • the processing device 1 further comprises a second RF receiver 102 connected to the antenna 2 via a second output of the selector 100, the selector 100 being further adapted to configure the antenna 2 in a second mode associated with the second RF receiver 102, in parallel of the first mode associated with the first RF receiver 101 , the second mode being also among the omnidirectional mode and the plurality of directional modes.
  • the second RF receiver 102 comprises a second tuner and a second demodulator including AGC adjustment, Intermediate Frequency amplification, interferences rejection, multipath cancellation and Forward Error Correction, leading to an optimal SNR (Signal to Noise Ratio (SNR) and/or BER (Bit Error Rate).
  • both the first and second antenna modes are the omnidirectional mode.
  • a configurable power splitter included in either the selector 100 or in the antenna 2, is configured by the processing module 1 30 so as to split the power received from the omnidirectional radiation pattern 1 0 towards both the first and the second outputs of the selector 1 00.
  • both the first and second antenna modes are a different directional mode, each mode respectively corresponding to a first and a second directional beam 1 1 , 12, 13, 14, 15, 16, 17, 18.
  • the selector 1 00 is configured by the processing module 130 to direct the power received from the first directional beam to the first output and the power received from the second directional beam to the second output in parallel.
  • the first antenna mode is the omnidirectional mode and the second antenna mode is a directional mode corresponding to a directional beam 1 1 , 12, 13, 14, 15, 16, 17, 18.
  • the selector 1 00 is configured by the processing module 130 to direct the power received from the omnidirectional radiation pattern 10 towards the first output in parallel of directing the power received from the directional beam to the second output.
  • the third example is for example advantageous for further parallelizing the steps S1 and S2.
  • a first RSS and/or a first signal quality is measured for a first channel by the first receiver in parallel of a second RSS and/or a second signal quality being measured by the second receiver for a second channel.
  • the processing device 1 further comprises a processing module 130, for example a processor, configured to set the antenna 2 in at least a mode among the omnidirectional mode and the plurality of directional modes.
  • the antenna mode selection is done by the processing module 130 sending a control signal to the selector 1 00 further appropriately reconfiguring the antenna 2.
  • the processing module 130 is configured to set the antenna 2 in the omnidirectional mode for measuring a first RSS for a set of channels at various indoor locations so as to determine a location.
  • the processing module 130 is further configured to set the antenna 2 in a directional mode selected for each channel based on a first signal quality measured for each channel of the set of channels at the determined location. According to a specific and non-limiting embodiment the processing module 130 is further configured for measuring the first (and/or second) signal quality of each channel for each directional mode of the antenna.
  • the processing module 130 is further optionally configured to set the antenna 2 in the omnidirectional mode for measuring a second RSS for a second subset of channels at various indoor locations in parallel to measuring the first RSS for a first subset of channels at the various indoor locations, so as to determine a location.
  • the processing module is further optionally configured to set the antenna 2 in a directional mode selected for each channel based on a first signal quality measured for each channel of a first subset of channels at the determined location, in parallel of a second signal quality measured for each channel of a second subset of channels at the determined location.
  • the processing module 130 is further optionally configured for measuring the first (and/or second) signal quality of each channel for each directional mode of the antenna, the selected directional mode for a channel corresponding to the highest quality of the first and/or second quality factor being measured for the channel et for each directional mode.
  • the processing module 1 30 is further optionally configured to configure the first RF receiver 101 to receive a TV program from the antenna, being configured in a first directional mode corresponding to a channel of the TV program.
  • the processing module 130 is further configured to configure the second RF receiver 102 to sequentially configure the antenna in other directional modes and to measure the second signal quality of the channel of the TV program for each other directional mode.
  • the processing module 130 is further configured to switch the antenna 2 from a first directional mode to a second directional mode and the associate the second directional mode of antenna 2 with the first RF receiver 101 for receiving the channel in case the second signal quality measured by the second receiver 102 for the channel as the second directional mode is configured, is of higher quality than the first signal quality being measured for the channel by the first RF receiver 101 as the first directional mode was configured.
  • the first RSS and/or the first signal quality, in any of its variant are permanently measured by the first RF receiver 101 , and are accessible to the processing module 130 on request.
  • the level of the received signal strength is deducible from the value of the AGC (Automatic Gain control) available at the tuner and/or demodulator interface.
  • the first received signal strength and/or the first signal quality in any of its variant are measured by the first RF receiver 1 01 based on a request sent by the processing module 130.
  • measured second RSS and/or second signal quality are compatible with the disclosed principles.
  • the processing device 1 further comprises an optional input 150 to receive user data from a user.
  • User data comprise trigger data generated from a user interface in order to trigger RSS measurements by the processing module 130, as the processing device 1 is located at various candidate locations.
  • User data also comprise validation data generated from a user interface so that, for example, the processing module 130 determines the location for positioning the processing device 1 .
  • the input 150 belongs to a set comprising: - a touch screen sensor and its accompanying controller based firmware able generate trigger data and validation data from a locally displayed user interface;
  • Any other hardware adapted to enable a user to communicate user data to the processing module in relation to a user interface.
  • the processing device 1 further comprises an optional network interface 140 coupled in signal communication to the processing module 1 30, the first RF receiver 101 and the optional second receiver 1 02.
  • the network interface 140 is for example configured to transmit a TV program received from and demodulated by the first 101 or the second 102 RF receiver to another network device over a network.
  • the network interface 140 is also for example configured to receive user data from a remote device displaying a remote user interface to the user, and to send them to the processing module 130.
  • the network interface 140 is a local area network interface and belongs to a set comprising:
  • Ethernet interface or any network interface compatible with the IEEE 802 family of wired standards
  • a WiFi network interface in any of its variants, or more generally any networking standard compatible with the IEEE 802.1 1 family of standards;
  • the processing device 1 further comprises an optional audio video decoder 1 10 coupled in signal communication to the processing module 130 and the first RF receiver 101 .
  • the audio video decoder 1 10 receives TV programs from the first RF receiver 101 .
  • the audio video decoder 1 1 0 is further configured to decode the TV program and send the decoded data to an optional audio video output 120 such as an audio video rendering means.
  • the audio video rendering means is external to the device and the output 120 sends the decoded data to render to an external rendering means.
  • the rendering means internal or external, belongs to a set comprising:
  • the processing module 130 comprises a first processor 1 31 coupled in signal communication to a second processor 132.
  • the first processor 1 31 is advantageously further connected to the selector 100 and the antenna, while the second processor 132 is further connected to the first receiver 101 , and to the optional second receiver 102, input 150, network interface 140, decoder 101 and output 120.
  • Two independent processors 131 and 132 allow to implement an antenna 2 separated from the processing device, i.e. not necessarily integrated in the digital signal receiver.
  • the antenna 2 is a frequency tunable antenna.
  • the antenna 2 is frequency tunable between the UHF (Ultra High Frequency) band, typically 470-700MHz, and the VHF (Very High Frequency) band, typically 174-216MHz.
  • the antenna 2 is frequency tunable for each RF channel of both bands.
  • a frequency tunable antenna advantageously improves the performances of a small size antenna in dedicated frequency bands.
  • the processing module 130 is further configured to tune the frequency of the antenna, for operating in a RF channel, operating in a RF channel comprising any operation mentioned on the steps S1 , S2 and S3 of the disclosed principles.
  • the disclosed principles are also applicable to devices directly connected to a display means or integrating a display means such as digital TVs. Indeed the disclosed principles allow to assist a user in the installation of the device by identifying a best location among candidate locations and by appropriately configuring the antenna in the best location.
  • Figure 3b depicts a processing device 1 b for displaying a quality indicator of a given channel.
  • the processing device 1 b comprises an RF receiver 10 configured to receive digital TV signal from a broadcast network interface such a digital terrestrial network interface.
  • the RF receiver 10 comprises an antenna, internal or external to the processing device 1 b, as well as a tuner a demodulator including AGC adjustment, similar to the RF receiver 101 of the processing device 1 of figure 1 a.
  • the processing device comprises a second RF receiver (not represented), connected to the same antenna as the RF receiver 1 0, and able to receive the same signal in parallel.
  • the input 1 0 is linked to a processing module 14 configured to tune the RF receiver to a given channel, to determine a quality indicator of the given channel, by dividing a RSS value measured for the given channel by an average of a set of noise levels determined for a plurality of channels, and to send for display to the output 18 such as a display means, the quality indicator of the given channel with an indication of whether the quality indicator meets a second criterion.
  • the display means is external to the device and the output 18 sends the data to display to an external display means.
  • the display means internal or external, belongs to a set comprising:
  • any display means allowing to display a quality indicator of a given channel with an indication of whether the quality indicator meets a criterion, is compatible with the disclosed principles.
  • the processing module is further configured to scan a set of channels. More precisely, the processing module is configured, for each channel of the set of channels, to tune to the channel, to determine a quality indicator of the channel, by dividing a RSS value measured for the channel by an average of a set of noise levels determined for a plurality of channels, and to display the quality indicators of the channels together with indications of whether the quality indicators meet a second criterion. All the variants for displaying indications according to the user interface described in Figure 1 are compatible with the processing device 1 b. Displaying these indications are advantageous as a user is able to quickly determine whether a candidate location will provide good reception conditions or not.
  • FIG. 4b represents an exemplary architecture of the processing device 1 , 1 b according to a specific and non-limiting embodiment.
  • the processing device 1 comprises one or more processor(s) 410, which is (are), for example, a CPU, a GPU and/or a DSP (English acronym of Digital Signal Processor), along with internal memory 420 (e.g. RAM, ROM, EPROM).
  • the processing device 1 , 1 b comprises one or several Input/Output interface(s) 430 adapted to send to display output information and/or to allow a user to enter commands and/or data (e.g.
  • the processing device 1 further comprises a computer program stored in the memory 420.
  • the computer program comprises instructions which, when executed by the processing device 1 , 1 b, in particular by the processor 410, make the processing device 1 carry out the processing method described with reference to figures 1 a and 1 b.
  • the computer program is stored externally to the processing device 1 , 1 b on a non-transitory digital data support, e.g.
  • the processing device 1 , 1 b thus comprises an interface to read the computer program. Further, the processing device 1 , 1 b could access one or more Universal Serial Bus (USB)-type storage devices (e.g., "memory sticks.") through corresponding USB ports (not shown).
  • USB Universal Serial Bus
  • the processing device 1 is a device, which belongs to a set comprising:

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Abstract

L'invention concerne un procédé d'exploitation d'un récepteur de signal numérique. Une idée saillante des présents principes est d'utiliser un système d'antenne intelligent intégré dans un récepteur de signal numérique, le système d'antenne intelligent pouvant fonctionner dans un mode omnidirectionnel et dans une pluralité de modes directionnels, le système d'antenne intelligent étant en outre associé à un procédé d'installation en deux étapes du récepteur de signal numérique. La première étape du procédé d'installation consiste à déterminer un emplacement intérieur destiné à positionner le récepteur de signal numérique sur la base de la mesure de l'intensité de signal des canaux RF disponibles reçus par l'intermédiaire d'un diagramme de rayonnement omnidirectionnel du système d'antenne intelligent. La seconde étape du procédé d'installation consiste à configurer le système d'antenne intelligent, situé à l'emplacement déterminé, par la sélection d'un mode directionnel pour chaque canal, sur la base d'une qualité de signal telle qu'un rapport signal sur bruit, un taux d'erreur sur les bits ou n'importe quelle combinaison de ceux-ci. Le système d'antenne intelligent peut également être avantageusement exploité par une autre étape optionnelle d'optimisation dynamique de la qualité du signal afin de prendre en compte des changements dynamiques des conditions de propagation.
PCT/EP2018/051513 2017-01-30 2018-01-23 Procédé et appareil d'exploitation d'un récepteur de signal numérique WO2018138068A1 (fr)

Applications Claiming Priority (4)

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EP17305096.4A EP3355492A1 (fr) 2017-01-30 2017-01-30 Procédé et appareil permettant de faire fonctionner un récepteur de signal numérique
EP17305096.4 2017-01-30
EP17306309 2017-10-02
EP17306309.0 2017-10-02

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050289609A1 (en) * 2004-06-28 2005-12-29 Funai Electric Co., Ltd. Television broadcast receiver
EP2963834A1 (fr) * 2014-07-01 2016-01-06 Funai Electric Co., Ltd. Récepteur et circuit de syntonisation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050289609A1 (en) * 2004-06-28 2005-12-29 Funai Electric Co., Ltd. Television broadcast receiver
EP2963834A1 (fr) * 2014-07-01 2016-01-06 Funai Electric Co., Ltd. Récepteur et circuit de syntonisation

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Title
DVB ORGANIZATION: "a_74-2010.pdf", DVB, DIGITAL VIDEO BROADCASTING, C/O EBU - 17A ANCIENNE ROUTE - CH-1218 GRAND SACONNEX, GENEVA - SWITZERLAND, 9 April 2010 (2010-04-09), XP017846665 *

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