Patent ID: 9646616
Date: 2017-05-09
CPC Classifications: G10L

Claim:
1. A method for generating an encoded audio signal, the method comprising: receiving a frame comprising a time-frequency (T/F) representation of an input audio signal, the T/F representation having time slots, each time slot having subbands; estimating energy in subbands of the time slots; estimating a time variance across a first plurality of time slots for each of a second plurality of subbands; estimating a frequency variance of the time variance across the second plurality of subbands; determining a class of audio signal by comparing the frequency variance with a threshold; and transmitting the encoded audio signal, the encoded audio signal comprising a coded representation of the input audio signal and a control code based on the class of audio signal, wherein the encoded audio signal further comprises a representation of high-band coefficients and low-band coefficients, and wherein the control code indicates whether modification of the low-band coefficients and high-band coefficients in the time-frequency domain to correct for audio coding artifacts in post-processing should be performed.