Intelecommunications,equivalent pulse code modulation (PCM)noise is the amount ofnoise power on afrequency-division multiplexing (FDM) or wirecommunication channel necessary to approximate the same judgment of speech quality created byquantization noise in aPCM channel.

Note 1: The speech quality judgment is based on comparative tests.

Note 2: Generally, 33.5dBrnC ±2.5dB is considered the approximate equivalent PCM noise of a 7-bit PCMsystem.

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