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Methods and devices for coding and decoding digital audio signals

A technology of digital audio and coding method, applied in the field of digital signal coding, can solve the problem of high computational complexity

Inactive Publication Date: 2011-06-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] The technical problem to be solved by the present invention is to solve the problem of high computational complexity existing in the existing MCLT transform-based digital audio signal encoding and decoding method, and provide a digital audio signal encoding and decoding method and device with lower complexity

Method used

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  • Methods and devices for coding and decoding digital audio signals
  • Methods and devices for coding and decoding digital audio signals
  • Methods and devices for coding and decoding digital audio signals

Examples

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example 1

[0184] attached image 3 The specific implementation process of 4-point MCLT is given. This flow graph implements

[0185] X ( k ) = Σ n = 0 4 - 1 x ( n ) h ( n ) exp [ - j π 8 ( 2 n + 3 ) ( 2 k + 1 ) ] ; k = 0,1

[0186] The input is an audio signal x(n) of length 4: x(0), x(1), x(2), x(3); the output is an MCLT domain coefficient X(k) of length 2: X( 0), X(1).

[0187] The equivalent implementation process is as follows: ...

example 2

[0196] attached Figure 4 The specific implementation flow diagram of the 4-point IMCLT is given ( image 3 transpose of the flow graph). This flow graph implements

[0197]

[0198] The input is the MCLT domain coefficient X(k) of length 2: X(0), X(1); the output is the "overlapped" audio signal of length 4

example 3

[0200] attached Figure 5 An 8-point MCLT calculation flow diagram is given. This flow graph implements

[0201] X ( k ) = 2 2 Σ n = 0 8 - 1 x ( n ) h ( n ) exp [ - j π 16 ( 2 n + 5 ) ( 2 k + 1 ) ] ; k = 0,1,2,3

[0202] The input is an audio signal x(n) of length 8: x(0), x(1), ..., x(7); the output is an MCLT domain coefficient X(k) of length 4: X(0 ), X(1), X(2), X(3).

[0203] Th...

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Abstract

The invention discloses methods for coding and decoding digital audio signals, belonging to the technical field of digital signal coding. The methods are characterized by decomposing MCLT (modulated complex lapped transform) and IMCLT (inverse modulated complex lapped transform) matrixes with the length of 2M into two MCLT and IMCLT matrixes with the length of M respectively to be rapidly calculated when the digital audio signals are coded or decoded, thus reducing the calculation complexity. Compared with the prior art, the methods have the advantages of low calculation complexity, good real-time performance and easiness in implementation. The invention also discloses devices for coding and decoding digital audio signals. The devices adopt the methods.

Description

technical field [0001] The invention relates to a digital audio encoding and decoding method and device, belonging to the technical field of digital signal encoding. Background technique [0002] Since digital audio signals have a strong correlation in the spatial domain, one-dimensional overlapped orthogonal transform is an effective method to remove the redundancy in the spatial domain of digital audio signals, so it is widely used in various audio coding standards (such as: MPEG, E-AC-3, etc.). A digital audio encoding device generally includes a data input unit, a data forward transform unit, a quantization unit, and an entropy encoding unit, and a corresponding decoding device includes an anti-entropy encoding unit, an inverse quantization unit, a data inverse transform unit, and an output unit. Usually, in order to make the overlapped digital audio signal obtained after data inverse transformation can be completely recovered to obtain the original digital audio signal...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/02G10L19/18
Inventor 伍家松舒华忠王膂李松毅罗立民
Owner SOUTHEAST UNIV
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