Quick codebook searching method for LSP coefficient quantization in AMR speech coding
An AMR voice and coding technology, applied in the field of voice coding and mobile communication
Active Publication Date: 2012-03-28
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology
Although the current digital signal processor (DSP) technology has developed by leaps and bounds, it is still not a wise choice to use too much full search in the process of real-time speech processing.
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[0058] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.
[0059] see figure 1 Shown, the method for the quick codebook search of LSP coefficient quantization in this AMR speech coding, comprises the following steps:
[0060] (1) Initialize the quantized codeword index number output by the system, the current minimum Euclidean distance and the current quantized codeword index number in the system codebook, including the following steps:
[0061] (a) the quantization code word index number that system output is set is index=0;
[0062] (b) Set the initial minimum Euclidean distance as the maximum value dist_min=MAX that occurs in the calculation of the system;
[0063] (c) setting the current quantized codeword index number as k=0;
[0064] (2) Set the system cumulative count n to 1;
[0065] (3) under the current quantization codeword index number, the system carries out the weighted Euclidean su...
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The invention relates to a quick codebook searching method for LSP coefficient quantization in AMR speech coding, which comprises the following steps that: in a calculation process using a weighted Euclidean distance as a distortion measure, an intermediate result is compared with a given minimum distance constantly; if the intermediate result is greater than the minimum distance, continuous calculation of the code word distance is terminated; and thus, code words failing to meet requirements can be quickly screened out. The quick codebook searching method for the LSP coefficient quantizationin AMR speech coding avoids a large amount of unnecessary redundancy calculation by performing judgment after each time of weighted sum calculation when calculating the weighted Euclidean distance, as well as reduces calculation complexity, improves system execution efficiency and meet performance and efficiency requirements of real-time voice processing on the premise of no performance loss. In addition, the method has stable and reliable operation performance and wide application range and lays a firm foundation for the application the AMR technology to the third-generation mobile communication.
Description
technical field [0001] The invention relates to the technical field of mobile communication, in particular to the technical field of speech coding, in particular to a fast codebook search method for LSP coefficient quantization in adaptive multi-rate (AMR) speech coding. Background technique [0002] Adaptive Multi-Rate (AMR) speech coding is a speech compression coding applied to the third generation mobile communication WCDMA system formulated by 3GPP. It solves the rate allocation problem of source and channel coding in a more intelligent way. This makes allocation and utilization of wireless resources more efficient. It supports eight rates: 12.2kb / s, 10.2kb / s, 7.95kb / s, 7.40kb / s, 6.70kb / s, 5.90kb / s, 5.15kb / s and 4.75kb / s, in addition, it also Including low rate (1.80kb / s) background noise encoding mode. [0003] The scheme adopted by AMR speech coding is Algebraic Codebook Excited Linear Prediction (ACELP) technology, which is based on Codebook Excited Linear Predict...
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IPC IPC(8): G10L19/14G10L19/12G10L19/07
Inventor 薛奕冰许大山
Owner SPREADTRUM COMM (SHANGHAI) CO LTD