Method and device for implementing voice decode in voice decoder

Abstract

The invention relates to a decoding method and a device thereof, which comprises receiving data frames sent out from an encoding end. When the frame are destroyed, calculating and determining the basic tone delay parameter of the destroyed frames and conducting decoding operation according to the calculated and determined basic tone delay parameter of the destroyed frames to obtain data after decoding, wherein the treating process of determining the basic tone delay parameter of destroyed frames concretely comprises firstly determining the number of continuously happening destroyed frames and the tone delay parameter of the frames before, then adjusting and calculating the tone delay parameter of the frames according to the number of the continuously destroyed frames and the preset adjusting strategy to obtain the basic tone delay parameter of the current destroyed frames, the preset adjusting strategy is that the basic tone delay parameter of the current destroyed frames determined according to the change of the continuously destroyed frames fluctuates within a set value range, thereby overcoming the over-periodicity in the process of decoding and secures the accuracy of decoding.

Description

technical field [0001] The invention relates to the technical field of decoding, in particular to an implementation scheme for realizing speech decoding in a speech decoder. Background technique [0002] In the speech transmission system, the coding principle commonly used by the speech coder is ACELP (Algebraic Code Excited Linear Prediction, Algebraic Code Excited Linear Prediction). The code stream generated by the ACELP-based speech encoder is based on speech frames. 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] The parameters of the speech frame generated by the A...

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Problems solved by technology

[0034] It can be seen that in this scheme, if there is a connection bad frame, and Q lag = 1, then there will be multiple consecutive frames using the pitch delay parameters of the good frame received last time, which will obviously lead to the occurrence of excessive periodicity problems, and the classification of signals will also increase the complexity of the entire operation process

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