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从解复用器和解码器输出的音视频数据信号,并不能为我们直接所利用,视频数据信号还要通过视频编码器进行D/A即数/模转换,并按一定的制式标准变换成模拟视频,而音频数据信号也要通过音频D/A数/模转换器,将PCM音频数据转换成模拟立体声音频信号,并经过一级运放放大后才能推动后级电路,下面我们就分两部分加以说明。1、视频编码器:视频编码器采用的是一种高性能的PAL/NTSC/SECAM编码器,其作用是将由视频解码器输入的4:2:2格式的视频数据进
The audio and video data signals output from the demultiplexer and decoder can not be directly used by us. The video data signals are also D / A converted by digital / analogue encoders and converted into Analog video, and audio data signals through the audio D / A D / A converter, the PCM audio data into analog stereo audio signal, and after a stage amplifier to promote after-class circuit, the following we will be divided into two Part to explain. 1, video encoder: video encoder uses a high-performance PAL / NTSC / SECAM encoder, its role is to be input by the video decoder 4: 2: 2 format video data into