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Audio encoding device, decoding device, method, and program

An audio coding and coding technology, which is applied in speech analysis, speech recognition, instruments, etc., can solve problems such as the inability to flexibly adjust the optimal balance point of code rate and sound quality, and achieve the effect of reducing code rate and improving coding efficiency

Inactive Publication Date: 2007-05-23
PANASONIC CORP
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  • 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, method, and program
  • Audio encoding device, decoding device, method, and program
  • Audio encoding device, decoding device, method, and program

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Embodiment Construction

[0057] Embodiments of the present invention will be described below with reference to the drawings.

[0058] FIG. 1 is a block diagram showing an example of the functional configuration of an audio encoding device 100 and an audio decoding device 200 according to this embodiment.

[0059] (audio encoding device 100)

[0060] 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 .

[0061] In this embodiment, as an example of a pl...

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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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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