Patent ID: 9704501
Date: 2017-07-11
CPC Classifications: G10L

Claim:
1. A method of a codec apparatus for coding/decoding a signal in a communication system, the method comprising: generating, with a generator, a fixed codebook excited signal by using a pulse index for a speech signal; generating a first adaptive codebook excited signal by using a pitch index for the speech signal; generating a fixed codebook signal by multiplying the fixed codebook excited signal by a fixed codebook gain; generating a first adaptive codebook signal by multiplying the first adaptive codebook excited signal by a first adaptive codebook gain; generating a synthesis filter excited signal by summing up the fixed codebook signal and the first adaptive codebook signal: generating a second adaptive codebook excited signal by filtering the first adaptive codebook excited signal through a Low-Pass Filter (LPF); and generating a second adaptive codebook signal by multiplying the second adaptive codebook excited signal by a second adaptive codebook gain corresponding to a filtering of the LPF, wherein the second adaptive codebook gain is calculated using the second adaptive codebook excited signal.