Search method, device and speech coder for algebraic codebook
An algebraic codebook and search method technology, applied in the field of speech encoders, can solve problems such as affecting the application value of algorithms, high time complexity, and difficulty in real-time implementation of speech encoding algorithms.
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[0073] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0074] The present invention decomposes the algebraic sub-codebook track into multiple paths, and searches the final codebook index through a combination of a fixed path and a dynamic path, which effectively reduces the implementation complexity of the codebook search while ensuring the coding quality.
[0075] In speech coding, the input speech signal undergoes preprocessing and linear prediction analysis to obtain the perceptually weighted synthesis filter and the target vector x 0 For x 0 After adaptive codebook search, the residual target vector X′ can be obtained 0 :
[0076] x′ 0 (n)=X 0...
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