Idle channel noise suppressor for speech encoders

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

1979-06-13

1982-04-06

Sloyan, Thomas J.

Multiplex communications

Wide area network

Packet switching

370 4, 375 5, H03K 1301, H03K 1320

Patent

active

043237304

ABSTRACT:
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.

REFERENCES:
patent: 3508007 (1970-04-01), Goodall et al.
patent: 3712959 (1973-01-01), Fariello
patent: 3838416 (1974-09-01), Brown
patent: 3890467 (1975-06-01), Sciulli
patent: 4027102 (1977-05-01), Ando et al.
patent: 4061878 (1977-12-01), Adoul et al.
patent: 4142066 (1979-02-01), Ahamed

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