Fm multiplex broadcast receiver

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an FM multiplex broadcast receiver that receives paging information and emergency information and enhances convenience.

【0002】

[Conventional technology]

As shown in FIG. 2, the conventional FM multiplex broadcast receiver splits the FM detection signal from one tuner 201 into which the FM broadcast wave received by the antenna 1 is input into two, and each of them is combined with the stereo demodulation circuit 5. The multiple decoder 15 demodulates the stereo audio signal and the multiple signal, and the amplifier 6, the speaker 9, or the display 16 reproduces the audio or displays characters.

【0003】

Also, as shown in Figure 3, some televisions and VCRs were equipped with two tuners 301 and 302 to receive counterprograms.

【0004】

[Problems to be Solved by the Invention]

The conventional FM multiplex broadcast receiver has the following problems. (1) Since there is only one tuner, it was not possible to receive audio broadcasting and multiplex broadcasting at any broadcasting station. (2) There was no configuration that corresponded to paging information and emergency information.

【0005】

The present invention has been made in view of the above circumstances, and an FM multiplex broadcasting receiver capable of selecting audio broadcasting and multiplex broadcasting at any broadcasting station and adding convenience to paging information and emergency information. The purpose is to provide.

【0006】

[Means for solving problems]

In order to solve the above problems, the FM multiplex broadcasting receiver of the present invention is provided with a ringing tone synthesis circuit that superimposes a ringing tone and an audio attenuator that lowers the volume of audio broadcasting, and in the case of paging information or emergency information, it is controlled by a microcomputer. Was detected, and the above attenuator and ring tone synthesis circuit were controlled. In addition, the configuration is equipped with two tuners, an audio tuner and a multiplex tuner that can independently select audio broadcasting and multiplex broadcasting.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

By configuring the FM multiplex broadcast receiver as described above, if the multiplex signal output through the multiplexing tuner and multiplex decoder is paging information or emergency information, the microcomputer detects it, and the microcomputer detects it with the attenuator or the above-mentioned attenuator. The ringing sound synthesis circuit is controlled to automatically lower the volume of the audio broadcast and the ringing sound is superimposed. In addition, it has a configuration having a plurality of tuners capable of selecting audio broadcasting and multiplex broadcasting at any broadcasting station.

【0008】

[Example]

Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the FM multiplex broadcasting receiver of the present invention. In FIG. 1, the FM broadcast wave received by the antenna 1 is split into two, and one is frequency-converted to an intermediate frequency by the front end 2 of the audio tuner 101 and the local oscillator 3. The intermediate frequency is detected by the FM detector 4 in the FM detection signal. The FM detection signal is demodulated into a stereo audio signal by the stereo demodulation circuit 5. The stereo audio signal is amplified by the audio amplifier circuit 6. The amplified stereo audio signal is supplied to the speaker 9 through the attenuator 7 and the ring tone synthesis circuit 8 which can be controlled by the microcomputer 17.

【0009】

The other branched FM broadcast wave is frequency-converted to an intermediate frequency by the front end 12 of the multiplexing tuner 102 and the local oscillator 13. The intermediate frequency is detected by the FM detector 14 in the FM detection signal. The FM detection signal is demodulated into multiple signals by the multiplex decoder 15. The multiplex signal is taken into the microcomputer 17 and signal processed. The signal-processed multiplex signal is displayed as characters on the display 16. The selection of the audio tuner 101 and the multiplexing tuner 102 and the operation of the display 16 are performed by processing the input from the key 18 with the microcomputer 17.

【0010】

When the multiplex signal is paging information or emergency information, the microcomputer 17 detects it, attenuates the stereo audio signal by the attenuator 7 under the control of the microcomputer 17, and further paging by the ringing sound synthesis circuit 8. The composite signal on which the ringing sound is superimposed is supplied to the speaker 9.

【0011】

Further, in the case of the emergency information, the voice tuner 101 is selected in the same manner as the multiplexing tuner 102 by controlling the local oscillator 3 from the microcomputer 17. When the emergency information is finished, the microcomputer 17 returns the audio tuner 101 to the original channel selection in the same manner.

【0012】

When a call is made to an external pager placed near the FM multiplex broadcast receiver of the present invention, the ringing sound is detected by the microphone 11 and the ringing vibration is detected by the sensor 10, which is detected by the microcomputer 17, and the microcomputer 17 The stereo audio signal is attenuated by the attenuator 7 by the control from the speaker 9, and the composite signal on which the paging ring sound is superimposed is supplied to the speaker 9 by the ring sound synthesis circuit 8.

【0013】

Further, when the microcomputer 17 receives the multiplex signal in which the information for controlling the attenuator is input in advance on the transmitting side, the microcomputer 17 attenuates the stereo audio signal by the attenuator 7 according to this information, and further paging by the ringing sound synthesis circuit 8. The composite signal on which the ringing sound is superimposed is supplied to the speaker 9.

【0014】

[Effect of the invention]

As described above, according to the present invention, since the voice attenuator and the ring tone synthesis circuit are provided, in the case of paging information or emergency information, the volume of the voice broadcast is automatically lowered to synthesize the ring tone. Can reliably inform paging and emergency information. In addition, the same operation can be performed for a call to an external pager. Furthermore, since it has two tuners, an audio tuner and a multiplex tuner, audio broadcasting and multiplex broadcasting can be selected independently, and when multiplex broadcasting is emergency information, audio broadcasting is automatically selected as the same station as multiplex broadcasting. You can return to the original channel selection when you have finished broadcasting or emergency information. When the multiplex signal in which the information for controlling the attenuator is input in advance on the transmitting side is received, the FM multiplex broadcast receiver can be operated according to the control information.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram which shows the Example of the FM multiplex broadcasting receiver of this invention.

[Figure 2]

It is a block diagram which shows the conventional FM multiplex broadcasting receiver.

[Fig. 3]

It is a block diagram which shows the conventional 2 tuner television, a video tape recorder.

[Explanation of symbols]

1, 21 antenna 2, 12, 22, 26 front end 3, 13, 23, 27 local oscillator 4, 14 FM detector 5 Stereo demodulation circuit 6, 32 audio amplifier circuit 7 Attenuator 8 Ring tone synthesis circuit 9, 34 speakers 10 sensor 11 Mike 15 Multiple decoder 16, 33 indicators 17, 30 microcomputer 18 keys 101 Audio Tuner 102 Tuner for multiplex 201 Tuner 24, 28 Video detector 25, 29 Voice detector 31 Video amplifier circuit 301, 302 TV tuner