Patent ID: 8271273
Filing Date: 2012-09-18
Classification: G10L,H04B

Abstract:
1. A method of improving a perceptual weighting filter W(z) or a perceptual noise shaping filter F(z)=W(z)−1, used to enhance perceptual performance of a G.711 codec, the method comprising: i. inputting an unquantized signal sample to a G.711 encoder; ii. encoding said unquantized signal via the G.711 encoder to produce a coded bitstream using W(z) or F(z) as follows: where A(z) is an LP (Linear Prediction) predictor obtained from analyzing an input signal, {a wherein the controlling parameter α depends on an input signal level; when the input signal level becomes low (towards zero), α is towards 0; iii. receiving said bitstream at a decoder; and iv. outputting an enhanced decoded signal.