Voiced, unvoiced or noise modes in a CELP vocoder

Details Voiced, unvoiced or noise modes in a CELP vocoder Voiced, unvoiced or noise modes in a CELP vocoder

1994-04-18

1998-03-31

MacDonald, Allen R.

395 217, 395 219, 395 232, G10L 900

Patent

active

057347891

ABSTRACT:
A bit rate Codebook Excited Linear Predictor (CELP) communication system which includes a transmitter that organizes a signal containing speech into frames of 40 millisecond duration, and classifies each frame as one of three modes: voiced and stationary, unvoiced or transient, and background noise.

REFERENCES:
patent: 4058676 (1977-11-01), Wilkes et al.
patent: 4771465 (1988-09-01), Bronson et al.
patent: 5125030 (1992-06-01), Noruma et al.
patent: 5293449 (1994-03-01), Tzeng
patent: 5295223 (1994-03-01), Saito
patent: 5341456 (1994-08-01), DeJaco

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