Patent ID: 9489961
Filing Date: 2016-11-08
CPC Classification: G10L,H04B

Claim Text:
1. A method comprising: receiving a digital audio input signal by a coder device; performing an ADPCM-type coding of the digital audio input signal by the coder device to produce multiplexed quantization indices; during the ADPCM-type coding of the digital audio input signal, controlling shaping of coding noise by implementing a feedback by the coder device comprising a filtering of the noise, wherein controlling shaping comprises the following acts: obtaining a second reflection coefficient arising from a linear prediction analysis of the input signal, this parameter indicating a large spectral dynamic range of the signal and a risk of instability of the feedback; detection of a risk of instability by comparing the second reflection coefficient with at least one predetermined threshold; deactivation of the feedback by the coder device in the case of detection of risk of instability; and progressive reactivation of the feedback by the coder device over several frames following a current frame for which the feedback has been deactivated; and transmitting the quantization indices on a transmission channel.