CN117241011B - Measuring device supporting 4K/8K broadcast television signals - Google Patents
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Abstract
The invention discloses a measuring device supporting 4K/8K broadcast television signals, which comprises an MCU module, a numerical control attenuation module, a tuning-demodulation module, a power module, a processing standard selection module and a display screen, wherein the numerical control attenuation module is used for receiving analog signals or digital signals, and attenuating the received signals when the intensity of the received signals is higher than a set threshold value; the processing standard selection module is used for selecting a plurality of different processing standards; the tuning-demodulating module selects ISDB-S, ISDB-S3 and CATV signals from the signals input by the numerical control attenuation module, and tunes and demodulates the selected signals according to the selected processing standard; and the MCU module processes the signals demodulated by the tuning-demodulation module to obtain a measurement result, and the measurement result is displayed through the display screen. The invention can be compatible to carry out multi-standard measurement on analog or digital signals in the broadcast television signals, intuitively display the measurement results and improve the maintenance efficiency and quality of broadcast television network maintenance personnel.
Description
Technical Field
The invention relates to the technical field of broadcast television network signal measurement, in particular to a measuring device supporting 4K/8K broadcast television signals.
Background
The central broadcasting television total station successfully realizes the CCTV test broadcast of the 8K ultra-high definition channel in 2021 and 2 months, which marks the first realization of the 8K ultra-high definition television live broadcast worldwide. 4K/8K broadcast definition is 4-16 times higher than HDTV. Currently, in many countries and regions, some broadcast television channels already provide 4K channels. As 8K technology advances and consumer demand for higher quality content increases, it is expected that more broadcast television channels will begin to provide 8K content in the future.
At present, the maintainer of the broadcast television network lacks corresponding measuring equipment to support accurate and visual measurement of 4K/8K broadcast television signals, and has low maintenance efficiency and quality.
Accordingly, the prior art is in need of improvement.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a measuring device supporting 4K/8K broadcast television signals, which aims to support measurement of 4K/8K broadcast television signals, and is compatible with multi-standard measurement of 4K/8K broadcast television signals and cable television analog signals or digital signals, and intuitively display measurement results, thereby improving maintenance efficiency and quality of broadcast television network maintenance personnel.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the measuring device supporting the 4K/8K broadcast television signals comprises an MCU module, a numerical control attenuation module, a tuning-demodulation module, a power supply module, a processing standard selection module and a display screen, wherein the numerical control attenuation module, the tuning-demodulation module, the power supply module, the processing standard selection module and the display screen are connected with the MCU module;
the digital control attenuation module is used for receiving an analog signal or a digital signal to be measured, and attenuating the received signal when the received signal strength is higher than a set threshold value;
the processing standard selection module is used for selecting a plurality of different processing standards, wherein the processing standards comprise a digital/analog measurement mode and a signal system;
the tuning-demodulating module gates signals of three frequencies of ISDB-S, ISDB-S3 and CATV in the signals input by the numerical control attenuation module, and tunes and demodulates the selected signals according to the selected processing standard;
the MCU module processes the signals demodulated by the tuning-demodulation module to obtain measurement results, and the measurement results are displayed through a display screen;
the power supply module provides working voltage for the MCU module.
The signal system in the processing standard comprises: PAL, NTSC, SECAM, DVB-T/T2/C, ISDB, DTMB, ATSC 1.0.0, ATSC3.0, J.83B.
The optical power detection module is used for detecting optical signals in the optical fiber network and displaying the power of the optical signals on a display screen after the optical signals are processed by the MCU module.
The optical power detection module comprises a photodiode, a detection circuit and a first operational amplifier;
the input end of the photodiode receives an optical signal, the output end of the photodiode is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the MCU module.
The detection circuit comprises a first capacitor, a second capacitor, a first resistor and a first inductor;
the first capacitor, the second capacitor and the first resistor are connected in parallel, wherein the first ends of the first capacitor, the second capacitor and the first resistor are commonly connected with the output end of the photodiode, and the second ends of the first capacitor, the second capacitor and the first resistor are commonly grounded;
the first end of the first inductor is connected with the output end of the photodiode, and the second end of the first inductor is connected with the positive input end of the first operational amplifier.
The temperature compensation unit is used for comparing the actual temperature detected by the temperature detection module with a preset temperature and compensating a measurement result of a measurement signal according to the comparison result.
When the actual temperature is greater than a preset temperature, the temperature compensation unit compensates the measurement result in a high-temperature compensation mode;
when the actual temperature is lower than the preset temperature, the temperature compensation unit compensates the measurement result in a low-temperature compensation mode.
The temperature detection module comprises a first temperature detection module and a second temperature detection module which are respectively connected with the MCU module, wherein the temperature detected by the first temperature detection module is used for compensating the measurement result of the CATV signal by the MCU module, and the temperature detected by the second temperature detection module is used for compensating the measurement result of the ISDB-S or ISDB-S3 signal by the MCU module.
The tuning-demodulating module transmits the input signal to be measured through two paths of ISDB-S+CATV and ISDB-S3 signal channels, then transmits the signal output in the ISDB-S+CATV signal channel through two paths of ISDB-S, CATV signal channels, and tunes and demodulates the selected ISDB-S3 and ISDB-S, CATV signals.
The tuning-demodulation module comprises a first duplexer, a second duplexer, a radio frequency switch module, an amplifying module, a satellite tuner, a CATV tuner and a multi-purpose demodulator;
the input end of the first duplexer receives an analog signal or a digital signal to be measured, the first duplexer divides the input signal into two paths of ISDB-S+CATV and ISDB-S3 signals, outputs the ISDB-S+CATV signals to the second duplexer, and outputs the ISDB-S3 signals to the radio frequency switch module;
the second duplexer divides the ISDB-S+CATV signal into two paths of ISDB-S, CATV signals, outputs the ISDB-S signals to the radio frequency switch module and outputs the CATV signals to the amplifying module;
the radio frequency switch module selectively outputs ISDB-S3 or ISDB-S signals to the satellite tuner, and the satellite tuner tunes the input ISDB-S3 or ISDB-S signals and outputs the signals to the multi-purpose demodulator;
the amplifying module amplifies or does not amplify the input CATV signal and outputs the amplified signal to the CATV tuner, and the CATV tuner tunes the input CATV signal and outputs the tuned signal to the multi-purpose demodulator;
the multipurpose demodulator demodulates the input signals of the tuned ISDB-S3 and the ISDB-S, CATV respectively and outputs the signals to the MCU module.
It should be understood that within the scope of the present invention, the above technical features of the present invention and the technical features specifically described in the following (embodiment) may be combined with each other, so as to constitute a new or preferred technical solution, which is not described in detail herein.
The invention has the beneficial effects that: the system can measure 4K/8K broadcast television signals, cable television analog signals and digital signals, can demodulate according to various signal systems, and can intuitively display measurement results on a display screen, such as the intensity of the analog signals and the quality of the digital signals, so that maintenance staff can accurately and intuitively measure and maintain the broadcast signals, prompt maintenance efficiency and improve maintenance quality. Meanwhile, the tuning-demodulation module of the device can integrate various processing standards to carry out corresponding tuning demodulation on different signals, thereby reducing the equipment cost and being capable of being widely popularized and applied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of an embodiment of a measuring apparatus supporting 4K/8K broadcast television signals according to the present invention.
Fig. 2 is a schematic circuit diagram of the MCU module of the present invention.
Fig. 3 is a schematic circuit diagram of the digitally controlled attenuation module of the present invention.
Fig. 4 is a circuit schematic diagram of the optical power detection module of the present invention.
Fig. 5 is a schematic block diagram of another embodiment of a measuring apparatus supporting 4K/8K broadcast television signals according to the present invention.
Fig. 6 is a circuit schematic diagram of the first temperature detection module according to the present invention.
Fig. 7 is a circuit schematic of a second temperature detection module according to the present invention.
Fig. 8 is a functional block diagram of a tuner-demodulator of the present invention.
Fig. 9 is a circuit schematic of the first duplexer of the present invention.
Fig. 10 is a circuit schematic diagram of the rf switch module of the present invention.
Fig. 11 is a circuit schematic of the satellite tuner according to the present invention.
Fig. 12 is a schematic circuit diagram of a CATV tuner of the present invention.
Fig. 13 is a functional block diagram of a power module of the present invention.
Reference numerals illustrate:
100-device, 10-MCU module, 11-temperature compensation unit, 20-numerical control attenuation module, 30-tuning-demodulation module, 31-first duplexer, 32-second duplexer, 33-radio frequency switch module, 34-amplification module, 35-satellite tuner, 36-CATV tuner, 37-multipurpose demodulator, 40-power module, 50-processing standard selection module, 60-display screen, 70-optical power detection module, 71-photodiode, 72-detection circuit, 73-first operational amplifier, 80-temperature detection module, 81-first temperature detection module, 82-second temperature detection module, 90-bluetooth module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1 and 2, the present invention provides a measuring device 100 supporting 4K/8K broadcast television signals, which includes an MCU module 10, a digital control attenuation module 20 connected to the MCU module, a tuning-demodulation module 30, a power supply module 40, a processing standard selection module 50, and a display screen 60, wherein the digital control attenuation module 20 is further connected to the tuning-demodulation module 30. As an embodiment, the MCU module 10 of the present invention adopts a chip U1 as shown in fig. 2, and the chip U1 is connected with the digital control attenuation module 20, the tuning-demodulation module 30, the power module 40, the processing standard selection module 50 and the display screen 60 to control the coordination operation among the modules. Preferably, the type of the chip U1 of the MCU module 10 of the embodiment of the invention is UPD78F1146A.
The digital control attenuation module 20 is configured to receive an analog signal or a digital signal to be measured, and the digital control attenuation module 20 attenuates the received signal when the received signal strength is higher than a set threshold.
As shown in fig. 3, the digital control attenuation module 20 of the present invention adopts a U7 chip, and the 5 th pin of the U7 is connected to a broadcast television signal to be measured, where the connected broadcast television signal may be an analog signal, such as a CATV analog signal, or a digital signal, such as a satellite digital signal or a CATV digital signal. The 16 th pin of the U7 outputs a signal, and the output signal can be a signal attenuated or not attenuated by the numerical control attenuation module 20. The 1 st, 2 nd and 3 rd pins of the U7 are connected with the MCU module 10. Preferably, the U7 chip model of the embodiment of the invention is PE4312C-Z.
In this embodiment, the set threshold of the signal strength is 50dBuV, when the signal strength received by the digital attenuation module 20 is higher than 50dBuV, the input signal is automatically attenuated appropriately, and when the signal strength received by the digital attenuation module 20 is lower than 50dBuV, the digital attenuation module 20 directly transmits the signal to the tuning-demodulation module 30 at the subsequent stage without attenuating the signal. The determination of the input signal strength may be performed by the MCU module 10.
The processing standard selection module 50 of the present invention is used for selecting a plurality of different processing standards, including a digital/analog measurement mode and a signal system.
The processing standard selection module 50 may be a knob selection mode or a touch selection mode, the MCU module 10 receives a selection result of the processing standard selection module 50 and sends the selection result to the tuning-demodulation module 30, and the tuning-demodulation module 30 performs tuning and demodulation of the input signal according to the selection result.
The broadcast television signal input by the invention can be an analog signal or a digital signal. Meanwhile, the analog signal or the digital signal can be divided into different signal systems. The tuning-demodulation module 30 needs to process the input signal in a corresponding digital/analog measurement mode and signal format. If an analog signal is input, the tuning-demodulation module 30 performs tuning and demodulation according to a rule corresponding to the analog signal.
Preferably, in the embodiment of the present invention, a signal system in a signal processing standard includes: PAL, NTSC, SECAM, DVB-T/T2/C, ISDB, DTMB, ATSC 1.0.0, ATSC3.0, J.83B, etc., the measuring device 100 of the invention can be widely adapted to the measurement of signals of various systems so as to meet the measurement requirements of broadcast signal maintainers.
The tuning-demodulating module 30 according to the embodiment of the present invention gates signals of three frequencies, i.e., ISDB-S, ISDB-S3 and CATV, among the signals input from the digitally controlled attenuation module 20, and tunes and demodulates the selected signals according to the selected processing criteria.
That is, the tuning-demodulation module 30 has a signal filtering and screening function, and meanwhile, a plurality of signal processing standards are built in to process different screened signals according to the standards. Specifically, the tuning-demodulating module 30 of the present invention screens the incoming broadcast television signal for ISDB-S signals if ISDB-S signals are present, screens ISDB-S3 signals if ISDB-S3 signals are present, screens CATV signals if CATV signals are present, that is, any one of the three types of signals, ISDB-S, ISDB-S, CATV, of the incoming signals can be selected by the tuning-demodulating module 30 and passed through the tuning-demodulating module 30.
The signal frequency of ISDB-S3 is: 2224-3224 MHz.
The signal frequency of ISDB-S is: 1032-2072 MHz.
The signal frequencies of CATV are: 50-1000 MHz.
Wherein: the ISDB-S, ISDB-S3 signal is a satellite digital signal, and the CATV signal includes a cable television analog signal and a cable television digital signal.
The frequency range of the ISDB-S3 signal is the 4K/8K ultra-high definition signal to be supported by the present invention, so the measurement device 100 of the present invention can support measurement of 4K/8K broadcast television signals, and can also be compatible with measurement of cable television analog signals and digital signals.
If an ISDB-S signal (satellite signal) of an ISDB standard is input, the tuning-demodulation module 30 screens out the ISDB-S signal, then tunes according to the digital satellite signal, and demodulates according to the ISDB standard.
If a CATV signal (analog signal) of the PAL standard is input, the tuning-demodulation module 30 screens out the CATV analog signal, then tunes according to the analog signal, and demodulates according to the PAL standard.
Thus, the tuning-demodulation module 30 of the invention can be compatible with processing of analog signals, digital signals and signals of various systems, integrates various demodulation functions, and can save equipment cost.
The MCU module 10 processes the signal demodulated by the tuning-demodulation module 30 to obtain a measurement result, and displays the measurement result through the display 60. The tuning-demodulation module 30 completes demodulation calculation of the input signal, and the MCU module 10 converts the calculation result in the tuning-demodulation module 30 to obtain a specific measurement result value. In the embodiment of the invention, for analog signals, the measurement result is signal strength, for digital signals, the measurement result is signal quality, the signal quality of the digital signals comprises CNR (carrier-to-noise ratio), BER (bit error rate) and PER (packet error rate), the measurement result is accurately and intuitively displayed on the display screen 60 after being processed by the MCU module 10, and maintenance personnel can quickly judge the problem of a line or a node according to the measurement result, thereby improving the maintenance efficiency and the maintenance quality. It will be appreciated that the measuring device 100 of the present invention may also be used for laboratory testing of broadcast television signals.
The power module 40 of the present invention provides the MCU module 10 with a working voltage to ensure the MCU module 10 to work normally, and the power module 40 also provides power for other modules in the measuring device 100 of the present invention.
Preferably, as shown in fig. 1, the measuring device 100 of the present invention further includes an optical power detection module 70 connected to the MCU module 10, where the optical power detection module 70 is configured to detect an optical signal in the optical fiber network and display the power of the optical signal on the display screen 60 after processing the optical signal by the MCU module 10. With the development of technology, the broadcast television signal can be transmitted through the optical fiber at home, and the existing broadcast television network detection device has no function of measuring the broadcast television signal in the optical fiber network, while the measuring device 100 of the invention not only can measure the digital signal and the analog signal in the broadcast television signal, but also can measure the optical signal in the optical fiber network, and can intuitively display the power of the optical signal to judge the problem of the optical fiber network, thereby improving the maintenance capability.
As an embodiment, as shown in fig. 4, the optical power detection module 70 of the present invention includes a photodiode 71, a detection circuit 72, and a first operational amplifier 73.
The input end of the photodiode 71 (Q1 in fig. 4) receives an optical signal, the output end of the photodiode 71 is connected to the input end of the detection circuit 72, the output end of the detection circuit 72 is connected to the input end of the first operational amplifier 73 (U2 in fig. 4), and the output end REV of the first operational amplifier 73 is connected to the MCU module 10.
The measured optical signal is converted into an electrical signal through Q1, then detected by the detection circuit 72, and then converted into a voltage signal readable by the MCU through U2.
Specifically, the detection circuit 72 of the present invention includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a first inductor L1; the first capacitor C1, the second capacitor C2 and the first resistor R1 are connected in parallel, wherein the first ends of the first capacitor C1, the second capacitor C2 and the first resistor R1 are commonly connected with the output end of the Q1, and the second ends of the first capacitor C1, the second capacitor C2 and the first resistor R1 are commonly grounded. The first end of the first inductor L1 is connected with the output end of the Q1, and the second end of the first inductor L1 is connected with the positive input end of the U2.
C1, C2, R1 and L1 form a detection circuit, and input signals are detected, input through the positive input end of U2 and converted into voltage signals which can be acquired by the MCU module. In this embodiment, the negative input terminal of U2 is connected to resistors R3 and R4, and R3 and R4 are used to adjust the amplification factor of U2. The input end of Q1 is still connected with L2 and C4, and L2 is connected with the power, and L2 and C4 are parallelly connected, and L2 and C4 constitute the filter circuit of power end, avoid the interference of power to the optical signal.
Further, as shown in fig. 1, the measuring device 100 of the present invention further includes a temperature detection module 80 connected to the MCU module 10, and a temperature compensation unit 11 is disposed in the MCU module 10, where the temperature compensation unit 11 is configured to compare an actual temperature detected by the temperature detection module 80 with a preset temperature, and compensate a measurement result of a measurement signal according to the comparison result.
The temperature compensation unit 11 is used for reducing the error value of the measurement result caused by the temperature characteristic of the level test result of the measurement device 100 to compensate. Because the components have temperature characteristic fall under different temperature conditions, the test results of the same input signals to be tested at low temperature and high temperature have slight deviation compared with the test at normal temperature. The temperature compensation unit 11 of the temperature detection module 80 reduces measurement errors caused by the temperature characteristics of components.
Specifically, in the embodiment of the present invention, when the actual temperature is greater than a preset temperature, the temperature compensation unit 11 compensates the measurement result by adopting a high temperature compensation manner; when the actual temperature is lower than a preset temperature, the temperature compensation unit 11 compensates the measurement result by adopting a low temperature compensation mode. Thus, the measuring device 100 of the present invention can obtain accurate measurement results in both low temperature and high temperature environments, and is suitable for complex field environments.
If the preset temperature is set to 25 ℃, when the detected current temperature is compared with the preset temperature of 25 ℃, the broadcast signal measurement result at low temperature and high temperature is correspondingly compensated according to the preset compensation value in the temperature compensation unit 11, and the measurement result at low temperature and high temperature is kept the same as the measurement result at the preset temperature of 25 ℃.
Preferably, as shown in fig. 5, the temperature detection module 80 of the present invention includes a first temperature detection module 81 and a second temperature detection module 82 respectively connected to the MCU module 10, wherein the temperature detected by the first temperature detection module 81 is used for the MCU module 10 to compensate the measurement result of the CATV signal, and the temperature detected by the second temperature detection module 82 is used for the MCU module 10 to compensate the measurement result of the ISDB-S or ISDB-S3 signal.
As shown in fig. 6 to 7, the first temperature detection module 81 and the second temperature detection module 82 each include a temperature sensor and an operational amplifier, specifically, the first temperature detection module 81 includes a first temperature sensor U4 and a second operational amplifier U3, the output pin 6 of the U3 is connected to the pin 76 of the MCU for compensation in the CATV signal measurement process, the U4 detects the ambient temperature and converts the ambient temperature into an electrical signal, then the signal is input to the pin 3 of the U3, and the U3 amplifies the signal and transmits a voltage signal identifiable by the MCU. The second temperature detection module 82 includes a second temperature sensor U6 and a third operational amplifier U5, where the output pin 6 of the U5 is connected to the pin 76 of the MCU for compensation during measurement of the satellite signal (ISDB-S, ISDB-S3), the U6 detects the ambient temperature and converts the ambient temperature into an electrical signal, and then the signal is input to the pin 3 of the U5, and the U5 amplifies the signal and transmits a voltage signal that can be identified by the MCU. Preferably, in the embodiment of the present invention, the chip types of the first temperature sensor U4 and the second temperature sensor U6 are BD1020HFV-TR.
Preferably, the measuring device 100 of the present invention further includes a bluetooth module 90 connected to the MCU module 10.
The bluetooth module 90 is connected with the MCU module 10 through a serial port, and a user can wirelessly connect with the measuring device 100 of the present invention through a bluetooth function of a mobile phone, so as to transmit measurement data, log information, etc. of the measuring device 100, thereby avoiding the complexity of transmitting data through wired connection and improving convenience.
As one implementation, the tuning-demodulating module 30 of the present invention transmits the input signal to be measured through two paths of ISDB-S+CATV and ISDB-S3 signal paths, then transmits the signal output in the ISDB-S+CATV signal path through two paths of ISDB-S, CATV signal paths, and tunes and demodulates the selected ISDB-S3 and ISDB-S, CATV signals.
Namely, the tuning-demodulating module 30 of the invention firstly selects 2224-3224 MHz high-frequency signals ISDB-S3 or firstly selects 50-2072 MHz CATV and ISDB-S mixed signals, then respectively screens CATV and ISDB-S signals from the CATV and ISDB-S mixed signals, namely, firstly selects the highest-frequency ISDB-S3 from the input signals in the 50-3224 MHz frequency range, then respectively selects ISDB-S, CATV signals, sorts the 3 signals, and each sorted signal can be independently tuned and demodulated.
Because the ISDB-S3 signal has the highest frequency and is easy to be interfered, the ISDB-S3 signal is firstly selected in the first screening, the influence of the signal mixing with signals of other frequency bands in a subsequent circuit is avoided, and the measurement accuracy of the ISDB-S3 signal is improved.
Specifically, as shown in fig. 8, the tuning-demodulation module 30 of the present invention includes a first duplexer 31, a second duplexer 32, a radio frequency switch module 33, an amplification module 34, a satellite tuner 35, a CATV tuner 36, and a multi-purpose demodulator 37.
The input end of the first duplexer 31 receives an analog signal or a digital signal to be measured, the first duplexer 31 divides the input signal into two paths of ISDB-s+catv and ISDB-S3 signals, outputs the two paths of ISDB-s+catv signals to the second duplexer 32, and outputs the two paths of ISDB-S3 signals to the radio frequency switch module 33.
As shown in fig. 9, the first diplexer 31 is formed by C1, C2, C3, C4, L1, L2, L3, L4 together to form the high-pass portion of the diplexer, and C5, C6, C7, C8, L5, L6, L7, L8 together to form the low-pass portion of the diplexer.
The first diplexer 31 divides an input signal into two parts, i.e., an ISDB-s+catv 50-2072 MHz low-pass part and an ISDB-s3:2224-3224 MHz high-pass part, according to frequency limits, wherein the ISDB-S3 part is passed to the radio frequency switch module 33 and the ISDB-s+catv part is passed to the second diplexer 32. In fig. 9, RFin is an input signal terminal, ISDB-S3 is an output signal of a high-pass portion of the diplexer, and ISDB-s+catv is an output signal of a low-pass portion of the diplexer.
The second diplexer 32 splits the ISDB-s+catv signal into two signals ISDB-S, CATV, outputs the ISDB-S signal to the radio frequency switch module 33, and outputs the CATV signal to the amplifier module 34.
The circuit configuration in the second duplexer 32 is similar to that in the first duplexer 31 except that the parameter values of the respective elements are different. The second diplexer 32 is also divided into a high pass portion and a low pass portion. The second diplexer 32 is formed by dividing the incoming signal into two parts, namely, a CATV: 50-1000 MHz low pass part and an ISDB-S: 1032-2072 MHz high pass part, by frequency limitation, wherein the ISDB-S part is passed to the radio frequency switching module 33 and the CATV part is passed to the amplifying module 34.
The rf switch module 33 of the present invention selectively outputs ISDB-S3 or ISDB-S signals to the satellite tuner 35, and the satellite tuner 35 tunes the input ISDB-S3 or ISDB-S signals and outputs the signals to the multi-purpose demodulator 37.
The radio frequency switch module 33 is used for selecting which part of the signals is output according to the control signals provided by the MCU. As shown in fig. 10, where C1 and C2 are blocking capacitors, when the external input V1 is high and V2 is low, pins 1 to 5 of the rf switch module 33 (U8 in fig. 10) are turned on, the ISDB-S signal is output to ISDB out, and the ISDB-S3 signal is blocked; when the external input V1 is low and V2 is high, pins 3 to 5 of U8 are turned on, and accordingly, the ISDB-S3 signal is output to ISDBout and the ISDB-S signal is blocked. Isdblout accesses satellite tuner 35.
The RF switch module 33 corresponds to a dual-purpose switch, and transmits ISDB-S3 to the satellite tuner 35 when the input signal is ISDB-S3, and transmits ISDB-S to the satellite tuner 35 when the input signal is ISDB-S.
As shown in FIG. 11, the chip U9 in the satellite tuner 35 tunes the incoming ISDB-S or ISDB-S3 signal. Preferably, the model of the chip U9 in the satellite tuner 35 of the embodiment of the present invention is RT740.
The amplification module 34 of the present invention amplifies or does not amplify the input CATV signal and outputs the amplified signal to the CATV tuner 36, and the CATV tuner 36 tunes the input CATV signal and outputs the tuned signal to the multi-purpose demodulator 37.
The amplification module 34 may employ an RF low noise amplifier. For amplifying the incoming CATV signal and transmitting it to the CATV tuner 36 when the incoming CATV signal is below a threshold value, and for directly conducting the signal to the CATV tuner 36 when the incoming CATV signal is greater than or equal to the threshold value. An amplification module 34 is also connected to the MCU module for controlling amplification or non-amplification.
As shown in fig. 12, the chip U10 in the CATV tuner 36 tunes the input CATV signal. Preferably, the chip U10 in the CATV tuner 36 of the present embodiment is of the type R842.
The multipurpose demodulator 37 of the present invention demodulates the input signals ISDB-S3 and ISDB-S, CATV after tuning, respectively, and outputs the demodulated signals to the MCU module 10.
The multi-purpose demodulator 37 can demodulate both satellite signals (ISDB-S3, ISDB-S) and CATV signals, and is therefore called a multi-purpose demodulator, which saves cost by not having to provide a demodulator for each different signal. The demodulation standard of the multi-purpose demodulator 37 is controlled by a signal inputted from the MCU module 10, and the demodulation standard control instruction of the MCU module 10 is inputted from the processing standard selection module 50. Preferably, in the embodiment of the present invention, the chip type of the multi-purpose demodulator 37 is MN884433.
Preferably, as shown in fig. 13, the power module 40 of the present invention includes a rechargeable lithium battery, a power input terminal, a start switch circuit, a DC-DC circuit for powering the measuring device 100 of the present invention.
A 5000mAh rechargeable lithium battery is selected and used to power the measuring device 100 when used outdoors. The starting switch circuit is connected to a key switch, and when the key is triggered, the MCU module 10 controls the starting switch circuit to start to be in a conducting state. When the power input terminal is connected with external power supply, the power input terminal directly supplies power to the DC-DC circuit and the MCU module, meanwhile, the rechargeable lithium battery is charged, and when the power input terminal is charged to a threshold value, the MCU module controls the lithium battery to stop charging. When the power input terminal is not connected with external power supply, the lithium battery supplies power to the whole circuit.
The measuring device 100 supporting the 4K/8K broadcast television signal can measure the analog signals and the digital signals in the broadcast television signal through the MCU module 10, the numerical control attenuation module 20, the tuning-demodulation module 30, the power module 40, the processing standard selection module 50 and the display screen 60, can demodulate according to various signal systems, and then intuitively displays the measuring result on the display screen, is compatible with measuring the 4K/8K broadcast television signal and the cable television analog signals or the digital signals, is convenient for maintenance personnel to accurately and intuitively measure and maintain the broadcast signal, prompts maintenance efficiency and improves maintenance quality. Meanwhile, the device 100 of the invention is also provided with an optical power detection module 70, which can measure the optical signals in the optical fiber network for transmitting the broadcast signals and further improve the maintenance capability. Meanwhile, the device 100 of the invention is also provided with a temperature compensation unit 11, which can compensate errors caused by temperature influence and ensure the accuracy of measurement results. The tuning-demodulation module 30 of the device 100 integrates various processing standards to perform corresponding tuning demodulation on different signals, reduces equipment cost and can be popularized and applied.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims, rather, as the description of the invention covers all embodiments of the invention.
Claims (3)
1. The measuring device supporting the 4K/8K broadcast television signals is characterized by comprising an MCU module, a numerical control attenuation module, a tuning-demodulation module, a power supply module, a processing standard selection module and a display screen, wherein the numerical control attenuation module, the tuning-demodulation module, the power supply module, the processing standard selection module and the display screen are connected with the MCU module;
the digital control attenuation module is used for receiving an analog signal or a digital signal to be measured, and attenuating the received signal when the received signal strength is higher than a set threshold value;
the processing standard selection module is used for selecting a plurality of different processing standards, wherein the processing standards comprise a digital/analog measurement mode and a signal system;
the tuning-demodulating module gates signals of three frequencies of ISDB-S, ISDB-S3 and CATV in the signals input by the numerical control attenuation module, and tunes and demodulates the selected signals according to the selected processing standard;
the MCU module processes the signals demodulated by the tuning-demodulation module to obtain measurement results, and the measurement results are displayed through a display screen;
the power supply module provides working voltage for the MCU module;
the optical power detection module is used for detecting optical signals in the optical fiber network and displaying the power of the optical signals on a display screen after the optical signals are processed by the MCU module;
the optical power detection module comprises a photodiode, a detection circuit and a first operational amplifier;
the input end of the photodiode receives an optical signal, the output end of the photodiode is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the MCU module;
the detection circuit comprises a first capacitor, a second capacitor, a first resistor and a first inductor;
the first capacitor, the second capacitor and the first resistor are connected in parallel, wherein the first ends of the first capacitor, the second capacitor and the first resistor are commonly connected with the output end of the photodiode, and the second ends of the first capacitor, the second capacitor and the first resistor are commonly grounded;
the first end of the first inductor is connected with the output end of the photodiode, and the second end of the first inductor is connected with the positive input end of the first operational amplifier;
the temperature compensation unit is used for comparing the actual temperature detected by the temperature detection module with a preset temperature and compensating a measurement result of a measurement signal according to the comparison result;
the temperature detection module comprises a first temperature detection module and a second temperature detection module which are respectively connected with the MCU module, wherein the temperature detected by the first temperature detection module is used for compensating the measurement result of the CATV signal by the MCU module, and the temperature detected by the second temperature detection module is used for compensating the measurement result of the ISDB-S or ISDB-S3 signal by the MCU module;
the tuning-demodulation module comprises a first duplexer, a second duplexer, a radio frequency switch module, an amplifying module, a satellite tuner, a CATV tuner and a multi-purpose demodulator;
the input end of the first duplexer receives an analog signal or a digital signal to be measured, the first duplexer divides the input signal into two paths of ISDB-S+CATV and ISDB-S3 signals, outputs the ISDB-S+CATV signals to the second duplexer, and outputs the ISDB-S3 signals to the radio frequency switch module;
the second duplexer divides the ISDB-S+CATV signal into two paths of ISDB-S, CATV signals, outputs the ISDB-S signals to the radio frequency switch module and outputs the CATV signals to the amplifying module;
the radio frequency switch module selectively outputs ISDB-S3 or ISDB-S signals to the satellite tuner, and the satellite tuner tunes the input ISDB-S3 or ISDB-S signals and outputs the signals to the multi-purpose demodulator;
the amplifying module amplifies or does not amplify the input CATV signal and outputs the amplified signal to the CATV tuner, and the CATV tuner tunes the input CATV signal and outputs the tuned signal to the multi-purpose demodulator;
the multipurpose demodulator demodulates the input signals of the tuned ISDB-S3 and the ISDB-S, CATV respectively and outputs the signals to the MCU module.
2. The apparatus for measuring a 4K/8K broadcast television signal according to claim 1, wherein the signal system in the processing standard comprises: PAL, NTSC, SECAM, DVB-T/T2/C, ISDB, DTMB, ATSC 1.0.0, ATSC3.0 and J.83B.
3. The apparatus for measuring a supported 4K/8K broadcast television signal according to claim 1,
when the actual temperature is greater than a preset temperature, the temperature compensation unit compensates the measurement result in a high-temperature compensation mode;
when the actual temperature is lower than the preset temperature, the temperature compensation unit compensates the measurement result in a low-temperature compensation mode.
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| CN2810069Y (en) * | 2005-07-25 | 2006-08-23 | 武汉电信器件有限公司 | An optical receiving module for television signals |
| CN101800876A (en) * | 2010-01-26 | 2010-08-11 | 上海光家仪器仪表有限公司 | Analogue television and digital television signal analyzer |
| CN102685416A (en) * | 2011-01-06 | 2012-09-19 | 硅实验室股份有限公司 | Receiver and method of receiving analog and digital television signals |
| CN216700155U (en) * | 2022-01-24 | 2022-06-07 | 深圳市频信科技有限公司 | Demodulator circuit with satellite simulation and digital broadcasting |
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2023
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2810069Y (en) * | 2005-07-25 | 2006-08-23 | 武汉电信器件有限公司 | An optical receiving module for television signals |
| CN101800876A (en) * | 2010-01-26 | 2010-08-11 | 上海光家仪器仪表有限公司 | Analogue television and digital television signal analyzer |
| CN102685416A (en) * | 2011-01-06 | 2012-09-19 | 硅实验室股份有限公司 | Receiver and method of receiving analog and digital television signals |
| CN216700155U (en) * | 2022-01-24 | 2022-06-07 | 深圳市频信科技有限公司 | Demodulator circuit with satellite simulation and digital broadcasting |
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