Method for improving the coding efficiency of an audio signal

A technology of audio signal and encoding method, which is applied in the field of audio signal encoding, can solve the problems of complexity, not paying attention to the relationship between the frequency periodicity of audio signal, and not being able to fully simulate audio signal, etc., and achieve the effect of effective encoding

Inactive Publication Date: 2006-01-04
PROVENANCE ASSET GRP LLC
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Existing encoders suffer from the drawback of not paying attention to the relationship between the frequency of the audio signal and its periodicity
Using a fixed-order pitch predictor is too complex in some cases, while not adequately simulating the audio signal in others

Method used

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  • Method for improving the coding efficiency of an audio signal
  • Method for improving the coding efficiency of an audio signal
  • Method for improving the coding efficiency of an audio signal

Examples

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Embodiment Construction

[0024] figure 1 is a simplified block diagram showing an encoder 1 according to a preferred embodiment of the invention. Figure 4 is a flowchart 400 illustrating the method in accordance with the present invention. The encoder 1 can be, for example, a wireless communication device 2 ( image 3 ) voice coder for converting the audio signal into a coded signal to be transmitted in a data transmission system such as a mobile communication network or the Internet. In this way, it is very convenient to install the decoder 33 in the base station of the mobile communication network. Correspondingly, an analog audio signal, for example a signal generated by the microphone 29 and amplified in the audio unit 30 , can be converted into a digital signal in the analog-to-digital converter 4 if desired. The conversion precision is, for example, 8 or 12 bits, and the interval between successive samples (time resolution) is, for example, 0.125 ms. Obviously, the numerical values ​​presen...

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Abstract

The invention relates to a method for improving the coding accuracy and transmission efficiency of an audio signal. According to the method, a part of the audio signal to be coded is compared with earlier stored samples of the audio signal and a reference sequence of samples that best corresponds to the audio signal to be coded is identified. Predicted signals are produced from the reference sequence by means of long-term prediction, using at least two different LTP orders (M), a group of pitch predictor coefficients (b(k)) being formed for each pitch predictor order. The predicted signals for each pitch predictor order are compared with the audio signal to be coded in order to determine a prediction error. The amount of information required to code the predicted signals is compared with the amount of information required to code the original signal and a coding method that provides the best representation of the audio signal while minimising the amount of data required is selected.

Description

technical field [0001] The invention relates to a method for coding an audio signal for improving the coding efficiency of the audio signal. The invention also relates to a data transmission system comprising means for encoding an audio signal, to an encoder for encoding an audio signal, to a decoder for decoding an encoded audio signal and relates to a decoding method for decoding an encoded audio signal. Background technique [0002] Generally, audio coding systems generate coded signals from an analog audio signal, such as a speech signal. Usually, the coded signal is transmitted to a receiver by means of a data transmission method specific to a certain data transmission system. In the receiver, the audio signal is generated based on the coded signal. The amount of information to be transmitted is influenced, for example, by the bandwidth used to encode the information within the system, and also by the coding efficiency with which the coding is performed. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/04H03M7/30G10L19/09G10L19/18H03M7/36H04B14/04
CPCG10L19/18G10L19/09G10L19/08
Inventor J·奥延佩雷
Owner PROVENANCE ASSET GRP LLC
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