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Pulse codec method and pulse codec

A technology of pulse coding and pulse, which is applied in the direction of instruments and voice analysis, etc., can solve the problems of coding bit waste, coding index redundancy accumulation, and large computational complexity, and achieve the effect of saving coding bits

Active Publication Date: 2018-09-28
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] In the process of proposing the present invention, the inventors found that the algebraic pulse coding method provided by AMR_WB+ uses similar recursive coding logic to split the situation with a large number of coded pulses into several cases with a small number of coded pulses. The computational complexity is large, and at the same time, as the number of coded pulses on the track increases, the redundancy of the coded index will gradually accumulate, which is likely to cause a waste of coded bits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1. A pulse encoding method, such as figure 1 shown, including:

[0065] A1. Obtain pulses to be encoded on T tracks, where T is an integer greater than or equal to 2.

[0066] The total number of pulses that need to be encoded on each of the T tracks is usually determined according to the code rate. The more pulses that need to be encoded, the more bits are required for the encoding index and the higher the code rate. In this paper, pulse_num t Indicates the total number of pulses that need to be encoded on the t-th track, assuming t ∈ [0, T-1]; the total number of pulses on each track of the joint encoding can be the same or different.

[0067] A2. Count the pulses that need to be encoded on each track according to their positions, and obtain the number N of pulse positions on each track t , the distribution of pulsed positions on the track and the number of pulses at each pulsed position.

[0068] In this article:

[0069] to pos_num t Indicates the ...

Embodiment 2

[0123] Embodiment 2. A pulse encoding method. In this embodiment, each track of the joint encoding is calculated for its respective index, and then combined into an encoding index, such as image 3 shown, including steps:

[0124] B1. Obtain pulses to be encoded on T tracks, where T is an integer greater than or equal to 2.

[0125] B2, count the pulses that need to be encoded on each track according to their positions, and obtain the number N of pulse positions on each track t , the distribution of pulsed positions on the track and the number of pulses at each pulsed position.

[0126] Steps B1 and B2 can be performed with reference to steps A1 and A2 of Embodiment 1.

[0127] B3. Determine the first index I1 of each track according to the number of pulse positions on each track respectively t , the first index I1 t Corresponding to the number of pulse positions it represents, all possible distributions of pulse positions on the track.

[0128] B4. Determine the second i...

Embodiment 3

[0138] Embodiment 3. A pulse coding method. This embodiment is based on Embodiment 1 or 2 and proposes a method for further saving coding bits.

[0139] The encoding index Ind generation process of the pulse encoding method in this embodiment can be performed with reference to the method in the first or second embodiment, and the following operations are performed after the encoding index Ind is generated, such as Figure 4 shown, including:

[0140] C1. Comparing the coding index Ind and adjusting the threshold value THR, wherein,

[0141] THR≤2 Bmax -I max (T),

[0142] I max (T) represents the upper limit of Ind, Bmax represents the upper limit of the number of bits used to encode the coding index, if Ind is less than THR, then go to step C2, otherwise go to step C3.

[0143] C2. Encode Ind by using the first number of encoding bits.

[0144] C3, using the second number of coded bit pairs plus an offset value THR 0 Ind is encoded, THR≤THR 0 ≤2 Bmax -I max (T), the...

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Abstract

The embodiment of the invention discloses a pulse encoding and decoding method and a pulse coder-decoder. Two or more tracks are combined for conducting encoding, and therefore unoccupied code book space can be combined in the joint encoding process under the condition of single-track encoding to form encoding bits which can be saved; in addition, pulses to be encoded on each track are combined according to the positions, encoding is conducted for the number of positions with pulses, distribution of the positions with the pulses on the tracks, and the number of the pulses in the positions, multiple pulses in the same position are prevented from being encoded respectively, and more encoding bits are saved.

Description

technical field [0001] The invention relates to a pulse codec method and a pulse codec. Background technique [0002] In vector coding technology, algebraic codebooks are often used to quantize and code the residual signal after adaptive filtering. After searching and obtaining the position and symbol information of the best algebraic codebook pulse on the track, the corresponding index value is obtained through encoding calculation, so that the decoder can reconstruct the pulse sequence according to the index value. Under the premise of guaranteeing lossless reconstruction, reducing the bits needed to encode the index value as much as possible is one of the main goals of the research and development of the algebraic codebook pulse coding method. [0003] Taking a better coding method in speech coding—AMR_WB+: Adaptive Multi-Rate Wideband coding method as an example, a specific coding method adopted by the existing algebraic codebook pulse is illustrated. According to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/008
Inventor 马付伟张德军
Owner HUAWEI TECH CO LTD
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