Applies to the reversible process achieved by the PCMencoder/decoder system that transforms two audio signals into onePCM signal for compatibility, with either 525 line/ 60 fieldor 625 line/50 field television system. Establishes the signalformat for the PCM encoder decoder for reproducing audio signals inPCM form on a consumer video cassette system. Ensures standardizedsystem operation compatibility of encoder/decoder systems andinterchangeability of recorder tapes with players and systems.