Patent ID: 9583115
Date: 2017-02-28
CPC Classifications: G10L

Claim:
1. A method comprising: calculating, at an audio encoder, a sum of energy values based on a spectrally flipped version of an audio signal, the sum of energy values corresponding to an upper frequency range of a high-band portion of the audio signal; determining, at the audio encoder, whether a signal characteristic of the upper frequency range of the high-band portion satisfies a threshold; generating a high-band excitation signal corresponding to the high-band portion; generating a synthesized high-band portion based on the high-band excitation signal; determining a value of a temporal gain parameter based on a comparison of the synthesized high-band portion to the high-band portion; responsive to the signal characteristic satisfying the threshold, adjusting the value of the temporal gain parameter, wherein adjusting the value of the temporal gain parameter controls a variability of the temporal gain parameter; and transmitting the temporal gain parameter as part of a bit-stream from the audio encoder to a receiver.