Idle channel noise suppressor for speech encoders

Details Idle channel noise suppressor for speech encoders Idle channel noise suppressor for speech encoders

H - Electricity

04

B

354/71

H04B 14/04 (2006.01)

Patent

CA 1127311

IDLE CHANNEL NOISE SUPPRESSOR FOR SPEECH ENCODERS Abstract of the Disclosure The idle channel for a speech encoder is detected by the detection, at the encoder comparator output, of zero-level traversals caused by noise transient signals appearing at the analog input of the encoder. In response to the detection of an idle channel, the encoder is caused to output a PCM code sample corresponding to a zero amplitude analog signal. In order that a speech signal passing through zero amplitude during the sampling period not be confused with an idle channel condition, the detection circuit responds only to a plurality of zero-level traversals. -1-

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