Method and apparatus for maintaining convergence within an ADPCM

Details Method and apparatus for maintaining convergence within an ADPCM Method and apparatus for maintaining convergence within an ADPCM

1995-03-16

1996-09-24

Tse, Young T.

Pulse or digital communications

Pulse code modulation

Differential

375259, 341143, H04R 1406

Patent

active

055598323

ABSTRACT:
An information gap in an ADPCM signal is detected in one or both of a transmitter or receiver. This detection can be accomplished using a voice activity detector. When an information gap is detected, a clock signal to the encoder and/or decoder is interrupted. Alternatively, null frames can be inserted into the encoder and/or decoder. When null frames are used, it is preferable to insert comfort noise into the signal output from the decoder.

REFERENCES:
patent: 4142066 (1979-02-01), Ahamed
patent: 4672669 (1987-06-01), DesBlache et al.
patent: 4774496 (1988-09-01), Tomasevich
patent: 4864561 (1989-09-01), Ashenfelter et al.
The 32-kb/s ADPCM Coding Standard; Nevio Benvenuto, Guido Bertocci, and William R. Daumer; AT&T Technical Journal, vol. 65, Issue 5, Sep./Oct. 1986.

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