METHOD FOR LIMITING ADAPTIVE EXCITATION GAIN IN AN AUDIO DECODER

摘要

The invention concerns a decoder for an audio signal coded by an encoder comprising a long-term predictive filter. According to the invention, said decoder comprises: a block (211) for detecting losses of transmission frames, a module (222) for calculating values of an error indicating function, representing the accumulated error in decoding on the adaptive excitation following said transmission frame loss, an arbitrary value being assigned to said adaptive excitation for the lost frame, a module (213) for calculating an error indicating parameter based on said values of the error indicating function, a comparator (214) of said error indicating parameter with at least one given threshold, a discriminator (215) for determining based on of the result provided by the comparator (214) a value of at least one adaptive excitation gain to be used by the decoder. The invention is applicable to encoding and decoding digital signals such as audiofrequency signals.