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Reference.org
PCM adaptor
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<p>A PCM adaptor is a device that encodes <a href="/facts/Digital_audio/PgugcLAI">digital audio</a> as <a href="/facts/Video/F1AV8ben">video</a> for recording on a <a href="/facts/Videocassette_recorder/vNXMylt5">videocassette recorder</a>. The adapter also has the ability to decode a video signal back to digital audio for playback. This digital audio system was used for <a href="/facts/Mastering_(audio)/2EG4KMxC">mastering</a> early <a href="/facts/Compact_disc/g51GRloc">compact discs</a>. </p>