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Audio coding and decoding device and coding and decoding method

An audio codec, decomposed technology, applied in speech analysis, instruments, etc., can solve problems such as large computational load and high complexity

Active Publication Date: 2011-08-24
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the current technology, MDCT has high complexity and requires a large amount of calculation

Method used

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  • Audio coding and decoding device and coding and decoding method
  • Audio coding and decoding device and coding and decoding method
  • Audio coding and decoding device and coding and decoding method

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Embodiment Construction

[0024] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0025] figure 1 Shown is a schematic structural diagram of an audio codec device according to an embodiment of the present invention. As shown in the figure, the audio codec device 10 of the embodiment of the present invention includes a judging module 101 and a computing module 103 . A judging module 101, configured to determine that the number 2N of received signals to be converted is 2 i+1 ×3 j , i and j are integers; the operation module 103 is used to perform i-time radix 2 recursive decomposition of the signal to be transformed, decomposed into 3 j point discrete cosine transform; and for the 3 j The point discrete cosine transform is decomposed j-time base 3 recursively, and decomposed into 3 point discrete cosine transform.

[0026] Wherein, the operation module 103 further includes a butterfly operation module 1031 and a recursive oper...

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Abstract

The embodiment of the invention discloses an audio coding and decoding method, which comprises the following steps: determining the number 2N of received signals to be transformed by MDCT or IMDCT to 2<i+1>*3<j>, wherein i and j are integers; and performing N discrete cosine transform to the 2N signals to be transformed by the MDCT or IMDCT, performing 2-based recursive factorization to the N discrete cosine transform for i times into 3<j> discrete cosine transform, then performing the 3-based recursive factorization for j times into 3 discrete cosine transform. The embodiment of the invention also discloses an audio coding and decoding device, which can realize a unit structure for unified realization of 2 point and 3 point discrete cosine transform so as to make the unified unit structure realize 2*3<j> point discrete cosine transform finally. The audio coding and decoding method and the audio coding and decoding device can improve the performance for realizing an audio coding and decoding system, reduce power consumption, simultaneously realize any 2*3<j> signal to be transformed through the 2 point and 3 point discrete cosine transform, and complete the unifiedrealization of various audio standards.

Description

technical field [0001] The present invention relates to digital signal processing, in particular to an audio codec device and a codec method. Background technique [0002] There are many standards for the current audio signal format, such as MP3 (MPEG Audio Layer 3), AAC (Advanced Audio Coding), AAC+, AAC++, WMA (Windows Media Audio) and Real Audio, etc. The current audio standards use MDCT (Modified Discrete Cosine Transform, Improved Discrete Cosine Transform) / IMDCT (Inverse Modified Discrete Cosine Transform, Improved Inverse Discrete Cosine Transform) as the method of signal time-frequency and frequency-time conversion. [0003] US patent application US2008 / 65373 discloses an audio encoding device and method. The audio coding device can keep the time delay in a relatively small range, and alleviate the inter-frame distortion. The apparatus and method refer to MDCT. However, in the current technology, MDCT has high complexity and requires a large amount of calculation....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L19/16
Inventor 李昙张本好黄鹤云林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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