JPH0550832U - Vehicle receiver - Google Patents

Abstract

(57) [Summary] [Purpose] Receives traffic information from the station with the highest electric field strength. [Structure] The traffic information that is periodically broadcast is set as a predetermined time that is shorter than the time interval of the traffic information, and after the start of the traffic information broadcasting, a channel selection operation is performed automatically after each predetermined time. By detecting the electric field strength for each frequency and the identification signal of whether it is a traffic information broadcasting station or not, the traffic information broadcasting station with the strongest electric field strength is tuned in immediately before the traffic information broadcasting starts and the vehicle is received by receiving it. After selecting the traffic information station in the area where the vehicle is currently traveling, the traffic information broadcasting will start in a short time, and it will be possible to reliably hear the traffic information in the area where the vehicle is currently traveling. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an in-vehicle radio receiver.

[0002]

[Prior Art]

 When a broadcasting station broadcasts, it transmits an identification signal indicating whether the broadcasting station is a traffic information broadcasting station and whether or not it is currently broadcasting traffic information, and the receiving side transmits this identification signal. By selecting the traffic information station and receiving it, or during the broadcasting of the traffic information, the cassette receiver or the CD receiver can be temporarily interrupted by the audio receiver with cassette or the radio receiver with CD, RDS and ARI are known as broadcasting systems that can switch to a radio and listen to traffic information.

In RDS, 57KHZ, which is the third harmonic of the 19KHZ stereo pilot signal outside the frequency band of the FM modulated wave, is used as a subcarrier, and 2-phase PSK-modulated digital data is added to this subcarrier. This sub-carrier is frequency-modulated to the main carrier for broadcasting. As one of the transmitted digital data, an identification signal (TP code) as to whether or not it is a traffic information broadcasting station and an identification signal (TA code) as to whether or not traffic information is currently being broadcast are transmitted. ing. Therefore, by detecting this TP code, it becomes possible to select a traffic information broadcasting station. Also, by detecting the TA code, it becomes possible to pause the playback when playing the cassette or CD, switch the audio to radio, and hear the traffic information.

[0004]

[Problems to be solved by the device]

 However, the TP code and TA code can be received even outside the area where the broadcasting station that transmits them is covered by the traffic information service, so if the reception condition deteriorates and the TP code cannot be received. In the tuning operation of automatically selecting new traffic information, there is a possibility that traffic information other than the area in which the vehicle is traveling may be received. In this case, the radio receiver user needs to listen. You will hear no traffic information.

In order to solve this situation, there is a tuning method of selecting the communication information station having the strongest electric field strength when the electric field strength is below a certain level, but after the tuning, the traffic information starts before the traffic information starts. Since both sides are moving, there is a drawback that they are out of the service area of the selected traffic information station.

[0006]

[Means for Solving the Problems]

 Therefore, it is used that the traffic information station in the area where the vehicle is currently traveling has a stronger electric field strength than other traffic information stations and that the traffic information is periodically broadcast at 30-minute intervals or 1-hour intervals. However, a certain number of minutes shorter than the interval between the periodically broadcast traffic information and the traffic information is set as a predetermined time, and after this predetermined time has elapsed after the start of the traffic information broadcast, the channel selection operation is automatically performed The electric field strength and TP signal are detected for each frequency, and the traffic information broadcasting station with the highest electric field strength is selected and received immediately before the traffic information starts.

[0007]

[Action]

 After selecting a traffic information broadcasting station in the area where the vehicle is currently traveling, traffic information will be sent out in a short time, and you can definitely hear the traffic information in the area where the vehicle is currently traveling. It will be possible.

[0008]

【Example】

 FIG. 1 shows an embodiment of a radio receiver with a cassette according to the present invention. Except for the controller and the audio selector switch, it has the same structure as a well-known radio receiver with cassette, so a detailed explanation is omitted. The operation of the embodiment of the present invention will be described. When the FM broadcast is received by the antenna 1, it is amplified by the high frequency amplifier 2, is detected by the wave detector 4 through the intermediate frequency amplifier 3, and the audio signal is demodulated by the stereo demodulator 5 and becomes the output signals of the L and R channels. On the other hand, the RDS data obtained through the RDS data demodulator 9 and the error corrector 10 is input to the controller 11 via the 57KHZ band pass filter 8 and the signal level is detected from the intermediate frequency amplifier 3 via the level detector 7. Is input and selected by the PLL 13. Also, the reproduction head 14 and the equalizer amplifier 15 reproduce the sound from the cassette tape. Further, the sound of the FM or the cassette is selected by the sound changeover switch 16, amplified by the amplifier 17, and output.

Next, the operation of the present invention will be described with reference to the operation flow shown in FIG. The controller 11 always monitors whether or not the traffic information broadcasting station which is currently receiving has started the traffic information S1, and if the traffic information has started, clears the timer and starts the timer S2. Except when the traffic information starts, whether or not the set time has elapsed is monitored S3, and if the set time has not elapsed, the process returns to S1. The strong traffic information station is received, and the process ends at S5.

[0010]

[Effect of the device]

 As described above, according to the present invention, since the traffic information starts in a short time after selecting the traffic information broadcasting station with the strongest electric field strength, even if the vehicle is running, the area where the vehicle is currently running is definitely being run. You can hear traffic information.

[Brief description of drawings]

FIG. 1 is a block diagram of a radio receiver with a cassette of the present invention.

FIG. 2 is a diagram showing the flow of channel selection.

[Explanation of symbols]

 1 Antenna 2 High Frequency Amplifier 3 Intermediate Frequency Amplifier 4 Detector 5 Stereo Demodulator 6 Station Detector 7 Level Detector 8 57KHZ Bandpass Filter 9 RDS Demodulator 10 Error Corrector 11 Controller 12 LPF 13 PLL 14 Playhead 15 Playback Equalizer Amplifier 16 audio selector switch 17 amplifier 18 speaker output

Claims (1)

[Scope of utility model registration request] 1. When another program source is reproduced, the traffic information broadcasting station is automatically selected and received, and while the traffic information broadcasting station is broadcasting the traffic information, the reproduction is suspended and the audio output is switched to the radio. For a receiver that can hear traffic information, set a time that is a few minutes shorter than the interval between traffic information that is periodically broadcast and the traffic information as a predetermined time, and after the traffic information starts, automatically after this predetermined time elapses. By performing a channel selection operation and detecting the electric field strength and the identification signal of whether or not it is a traffic information broadcasting station for each frequency, the traffic information with the highest electric field strength is selected immediately before the traffic information broadcasting starts. An in-vehicle radio receiver characterized in that