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VCD小影碟机,作为新潮的多媒体民用产品,在不到半年时间里已大量推向家庭。由于VCD影碟机所用的12cm碟片价格低廉,仅为LD激光影碟的十分之一,因此倍受消费者青睐。本文介绍一种VCD解码板,可使拥有CD机的用户花较少的钱而享受到VCD的乐趣。 VCD解码板,是采用MPEG数字压缩技术标准的解码器。该解码板要将MPEG_1标准的编码数据进行解码,解码过程包括两个独立的MPEG_1视频和音频解码系统、活动图像和音频编码数据的分离处理以及同步、NTSC/PAL制式自动转换、复合视频信号的产生、音频数据信号的D/A转换等。整个系统由板内的CPU处理。该板的主要技术指标(1)视频特性:①制式:NTSC/PAL;②视频特性:复合视频输出;③输出电平:1V_(P-P);④阻抗:75欧姆;⑤分辨率:352×288(PAL)、352×240(NTSC);
VCD small player, as a trendy multimedia civilian products, in less than six months has been a lot of push to the family. Due to the low cost of 12cm discs used by VCD players, only one-tenth of LD laser discs, so much consumers. This article describes a VCD decoder board that allows users who have CD players to spend less money and enjoy the fun of VCD. VCD decoder board, using MPEG digital compression standard decoder technology. The decoding board to decode the MPEG_1 standard encoding data, the decoding process includes two independent MPEG_1 video and audio decoding system, the separation of moving images and audio encoded data processing and synchronization, NTSC / PAL automatic conversion, composite video signal Generation, D / A conversion of audio data signals and the like. The whole system is handled by the CPU inside the board. The board’s main technical indicators (1) Video Features: ① standard: NTSC / PAL; ② video features: composite video output; ③ output level: 1V_ (PP); ④ Impedance: 75 ohms; ⑤ resolution: 352 × 288 (PAL), 352 × 240 (NTSC);