US 7,191,123 B1
Gain-smoothing in wideband speech and audio signal decoderGeneral
US 7,191,123 B1
Gain-smoothing in wideband speech and audio signal decoder
Tech Center:
2600 Communications
Examiner:
David Hudspeth
Art Unit:
2626 Selective Visual Display Systems
Agent:
Inventors:
Bruno Bessette; Redwan Salami; Roch Lefebvre
Assignee:
Priority:
11/18/99
Filed:
11/17/00
Granted:
03/13/07
Expiration:
08/24/22
Abstract
The gain smoothing method and device modify the amplitude of an innovative codevector in relation to background noise present in a previously sampled wideband signal. The gain smoothing device comprises a gain smoothing calculator for calculating a smoothing gain in response to a factor representative of voicing in the sampled wideband signal, a factor representative of the stability of a set of linear prediction filter coefficients, and an innovative codebook gain. The gain smoothing device also comprises an amplifier for amplifying the innovative codevector with the smoothing gain to thereby produce a gain-smoothed innovative codevector. The function of the gain-smoothing device improves the perceived synthesized signal when background noise is present in the sampled wideband signal.