Decoding method and device

Abstract

The invention relates to a decoding method and a device. The invention mainly comprises the following steps: receiving a data frame sent from a coding terminal; if a bad frame occurs, then computing and determining a spectrum parameter of the current bad frame; and performing decoding operation according the spectrum parameter of the bad frame determined by computation and acquiring the data after decoding, wherein the processing procedure for determining the spectrum parameter of the bad frame comprises the following steps: first, determining quantity of current continuous bad frame, spectrum parameter of good frame before the bad frame occurs and constant average of the spectrum parameter; thereafter, offsetting the spectrum parameter of the good frame toward the constant average of the spectrum parameter in self-adapting manner and computing the spectrum parameter information of the current bad frame. Because the invention reduces gradually the relevancy between the spectrum parameter of the nearest good frame and the spectrum parameter of the current bad frame when the continuous bad frame occurs, more accurate spectrum parameter of the current bad frame can be acquired, and better voice quality can be acquired under the same code rate and frame error rate.

Description

technical field [0001] The invention relates to the technical field of speech decoding, in particular to a technology for processing bad frames received by a speech decoder. Background technique [0002] In a communication system, a code stream generated by a speech encoder based on ACELP (Algebraic Code Excited Linear Prediction) is based on a speech frame. The transmission process of the input data for each frame is as follows: figure 1 As shown, the speech encoder at the sending end needs to encode it into a set of parameters, and the parameters usually need to be quantized before being transmitted through the communication channel; the decoder at the receiving end needs to resynthesize the received parameters into a speech signal , so as to realize the transmission process of the voice signal. [0003] Parameters involved in the speech frame generated by the ACELP-based speech encoder generally include: spectral parameters, adaptive codebook parameters, algebraic codeb...

AI Technical Summary

Problems solved by technology

[0020] In the spectral parameter replacement implementation scheme of frame error concealment of AMR-WB and AMR-WB+ speech codec, when there are multiple bad frames in a row, the correlation between the ISF of the latest good frame and the current bad frame should be weakened , therefore, the calculation method of the corresponding replacement spectral parameters still cannot obtain better spectral parameters, that is, better speech performance cannot be obtained

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