Multiplex transmission method for voice and video signals
专利汇可以提供Multiplex transmission method for voice and video signals专利检索，专利查询，专利分析的服务。并且PURPOSE: To easily obtain a reproduced picture excellent in quality by applying a video signal with a low carrier wave frequency moudlation to convert it to an FM signal in 1MHz 10 MHz band, multiplexing it with a voice signal transmitted in baseband≤10kHz, and transmitting it.
CONSTITUTION: In a doorbell-camera multiplex transmission system for instance, a slave unit 10 includes a handset 11, a CCD camera 12, an FM moudlator 13, and a multiplexing part 14, while a master unit 20 comprises a branching part 21, a handset 22, a limiter 23, an FM modulator 24, and a monitor television 25. For a cable 30 to connect the slave unit 10 and the master unit 20, for instance, a pair-parallel PVC interior wire is used. A video signal in the baseband of 2∼3MHz is frequency-modulated by the FM modulator 13, and its frequency spectrum is expanded to 1.5∼6.5MHz, however, the cable 30 can transmit the FM video signal without any attenuation. A band lower than 10kHz is made a voice channel, and a crosstalk between voice and video is eliminated.
COPYRIGHT: (C)1987,JPO&Japio，下面是Multiplex transmission method for voice and video signals专利的具体信息内容。
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