Coding and decoding methods and devices thereof

Abstract

The embodiment of the invention discloses a coding method, which comprises: scaling a data frame according to the energy and coding bit number of the data frame; quantizing coded vectors in the scaleddata frame into closest RE8 grid points to acquire vectors to be coded; and coding the vectors to be coded by layer to acquire a coded code stream. The embodiment of the invention also discloses a decoding method, a coding device and a decoding device. The methods and the devices of the invention effectively reduce operation complexity and save storage space on the premise of ensuring coding anddecoding quality.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to an encoding method, a decoding method and a device thereof. Background technique [0002] In the current field of speech signal coding, a very important implementation method is transform coding. Its main idea is to divide the speech signal to be coded into several frames, and use Fast Fourier Transform (Fast Fourier Transform, FFT) or Discrete Cosine Transform (Discrete Cosine Transform). Cosine Transform, DCT) etc. convert the speech signal from the time domain to the frequency domain, and quantize the spectrum. The lattice vector quantization method is a commonly used method in the field of quantization at present. The design of the trellis vector quantization method mainly includes two aspects: selecting the appropriate trellis and designing a codebook with a specific trellis structure. [0003] The prior art provides a RE-based 8 Lattice vector quantization method...

AI Technical Summary

Problems solved by technology

The design of the lattice vector quantization method mainly includes two aspects: selecting an appropriate lattice and designing a codebook with a specific lattice structure.

[0004] However, in the prior art, the algorithm for generating each vector to be quantized in the data frame by using the absolute guide item and calculating the arrangement method has high computational complexity, and the storage space occupies a large amount, which is not conducive to the expansion and implementation of the scheme.

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