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Audio encoding device, decoding device, and method

An audio coding and coding technology, applied in speech analysis, speech recognition, instruments, etc.

Inactive Publication Date: 2011-11-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009]However, according to the conventional audio coding method and decoding method, since the phase difference between the signals of each channel is coded in each sub-band, there is a possibility that it cannot be flexibly The topic of adjusting the best balance point between bit rate and sound quality

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  • Audio encoding device, decoding device, and method
  • Audio encoding device, decoding device, and method
  • Audio encoding device, decoding device, and method

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Embodiment Construction

[0058] Embodiments of the present invention will be described below with reference to the drawings.

[0059] figure 1 It is a block diagram showing an example of the functional configuration of the audio coding device 100 and the audio decoding device 200 according to this embodiment.

[0060] (audio encoding device 100)

[0061] Audio coding device 100 is a kind of coding device, encodes the phase difference between a representative audio signal and a plurality of audio signals that should be separated from its representative audio signal, including: variable frequency division encoding section 110, representative signal generation unit 106 , representative signal encoding unit 107 , and multiplexing unit 108 . The variable frequency division encoding unit 110 includes: phase difference degree calculation units 101 , 102 , and 103 ; a selection unit 104 ; and a phase difference degree and division information encoding unit 105 .

[0062] In this embodiment, as an example ...

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Abstract

There are provided an audio encoding device and a decoding device capable of flexibly adjusting the optimal trade off between a code rate and sound quality. A variable frequency division encoding unit (110) includes: difference degree calculation units (101, 102, 103) for calculating the difference degree between the first and the second input signal according to the division methods A, B, C for dividing the frequency band into sub-bands; a selection unit (104) for selecting one of the selection methods; and a difference degree and division information encoding unit (105) for encoding the selected division method and the difference degree for each of the sub-bands in accordance with the selected division method. A variable frequency division decoding unit (210) includes: a division information decoding unit (202) for decoding the division information to know the division method; a switching unit (203) for outputting the difference degree code to one of the difference degree decoding units based on the division method; and difference degree decoding units (204, 205, 206) for decoding the difference degree code into a difference degree for each sub-band.

Description

technical field [0001] The present invention relates to a coding device and a decoding device of an audio signal, and in particular to a technology enabling flexible adjustment of the optimal balance point between code rate and sound quality. Background technique [0002] Originally, an ISO / IEC international standard system, commonly known as an MPEG (Moving Picture Experts Group: Moving Picture Experts Group) system, is widely used as an audio encoding method and a decoding method. At present, ISO / IEC13818-7, commonly known as MPEG-2AAC (Advanced Audio Coding: Advanced Audio Coding), has appeared as a coding method aimed at expressing high-fidelity audio signals with high applicability and at a low bit rate. method. [0003] According to this AAC, when encoding a multi-channel audio signal, a method called MS stereo (Mid Side Stereo) or intensity stereo (Intensity Stereo) is used to represent the correlation between channels, thereby compressing Audio information, improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L21/02G10L15/20G10L19/008
CPCG10L19/008G10L19/0208
Inventor 津岛峰生高木良明小野耕司郎田中直也宫阪修二
Owner PANASONIC CORP