Patent ID: 9705461
Date: 2017-07-11
CPC Classifications: G10L,H03G,H04S

Claim:
1. A method for adjusting a level of an audio signal in an audio processing apparatus, the method comprising: dividing an audio signal into a plurality of frequency bands; obtaining modification parameters for at least some of the plurality of frequency bands, the modification parameters comprising filter coefficients and amplitude scale factors, each amplitude scale factor respectively operating in a frequency band of a plurality of frequency bands and each amplitude scale factor representing an average energy over a frequency band and a time segment; deriving gain factors for at least some of the plurality of frequency bands, the gain factors determined at least in part from the amplitude scale factors; smoothing the gain factors; determining a level of noise from noise compensation factors; applying the gain factors to at least some of the frequency bands to generate gain adjusted frequency bands; adding the level of noise to the gain adjusted frequency bands; filtering at least some of the frequency bands with a filter generated with the filter coefficients; synthesizing the plurality of frequency bands to generate an output audio signal; wherein the gain factors are both time and frequency varying.