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目前市面上众多的VCD碟片,已兴起新的消费热潮。将CD机改制成VCD机、LD机增加播放VCD碟片的功能已成热点。其原理就是在CD机、LD机的解码芯片DSP中取出BCK、LRCK、DATA数字信号,经过MPEG解码板输出图像及声音信号。VCD解码板,其输入通常为三线,即BCK、LRCK、DATA,经内部解码电路后,分视频、音频输出。改CD机或LD机加装VCD功能时,首先要注意接口格式,现大多数VCD解码板支持国内大多数CD、LD机型输出格式。一般BCK位频率为2.1168MHz,LRCK位为44.1kHz,倍速则为88.2kHz,这类格式的DSP芯片为多,CD机的DSP还
Currently on the market many VCD discs, has started a new consumer boom. The CD machine into a VCD machine, LD machine to play VCD discs has become a hot spot. The principle is to remove the BCK, LRCK, DATA digital signal in the DSP decoder chip DSP, LD machine, through the MPEG decoder board output images and sound signals. VCD decoder board, the input is usually three lines, namely BCK, LRCK, DATA, after the internal decoding circuit, sub-video, audio output. To change the CD or LD machine installed VCD function, we must first pay attention to the interface format, most VCD decoders support most of the domestic CD, LD models output format. General BCK bit frequency of 2.1168MHz, LRCK bit is 44.1kHz, double speed is 88.2kHz, DSP chip for such formats as much as the CD machine’s DSP also