Method for determining ISF parameter in linear predication analysis

A linear predictive analysis and parameter technology, applied in the field of codec compression, can solve problems such as time-consuming and precision loss, and achieve the effect of simple operation steps

Active Publication Date: 2008-03-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0005] The disadvantage of this method is that there are a lot of multiplications in the process of lattice search root, and the introduction of time-consuming calculations such as inverse cosine in the process of calculating ISF by inverse cosine
If the look-up table method is used, the accuracy will be lost

Method used

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  • Method for determining ISF parameter in linear predication analysis
  • Method for determining ISF parameter in linear predication analysis
  • Method for determining ISF parameter in linear predication analysis

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Embodiment Construction

[0016] As shown in Figure 3, the method for determining ISF parameter of the present invention is, after obtaining the coefficient of polynomial with iterative method, can adopt two kinds of different methods of using root finding (shown in conjunction with Fig. 4,5) to search for root respectively The interval and the linear interpolation method can directly and quickly obtain the ISF parameters.

[0017] The method of using the iterative method to find the polynomial coefficient is to assume that the input linear prediction coefficient is recorded as a 1 , a 2 ,...,a 16 , then the corresponding LP polynomial is:

[0018] A ( z ) = 1 + Σ i = 1 16 a i z - i - - - ...

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Abstract

The method for determining ISF parameter in linear prediction analysis includes: deriving the polynome coefficient by iteration method, searching the interval where the root is at to obtain ISF parameter. Advantage: simple operation and suitable to audio/voice coding.

Description

technical field [0001] The present invention relates to a codec compression method, in particular to a method for determining ISF parameters during linear predictive analysis in audio / speech coding. Background technique [0002] As shown in Figure 1, in the existing audio / speech coding based on linear predictive analysis, the input signal of the linear predictive analysis module is a speech / audio signal, and the output signal is a linear predictive coefficient, which is used to extract the linear predictive coefficient of the input signal ;The linear prediction coefficient encoding module converts the linear prediction coefficient into ISF parameters for further parameter encoding, which is an important part of the entire encoding process; the input signal of the ISF encoding and quantization module is the ISF parameter, and the output signal is the quantized value of the ISF parameter , which is used to encode and quantize the input ISF parameters as a part of the encoded c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/12G10L19/14
Inventor 黄鹤云林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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