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Audio decoder, method and program

An audio decoder and audio signal technology, applied in the field of decoders, can solve problems such as sound quality deterioration, and achieve the effect of improving reproduction accuracy

Inactive Publication Date: 2007-08-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, since the directional information of the phase difference is not required, the phase difference can only be represented by 0° and 180°, so this will cause the sound quality to deteriorate

Method used

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  • Audio decoder, method and program
  • Audio decoder, method and program
  • Audio decoder, method and program

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Experimental program
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Embodiment approach 1

[0072] The audio decoder in Embodiment 1 of the present invention will be described below with reference to the drawings.

[0073] FIG. 1 is a diagram showing the configuration of an audio decoder according to the first embodiment. The audio decoder shown in Figure 1 decodes the bit stream, which includes: the first coded data, which represents the downmixed signal obtained by downmixing two audio signals; the second coded data, which represents the gain between the above two audio signals Ratio D; the third coded data, representing the phase difference θ between the two audio signals; and the fourth coded data, representing phase polarity information S, which phase polarity information S shows which of the above two audio signals The phase of one signal is advanced; and the above-mentioned two audio signals are reproduced, and the above-mentioned audio decoder includes: a decoding part 100 , a conversion part 101 , a phase rotation operator determination part 102 , a separati...

Embodiment approach 2

[0171] An audio encoder in Embodiment 2 of the present invention will be described below with reference to the drawings.

[0172] FIG. 7 is a diagram showing the configuration of an audio encoder in the second embodiment. This audio encoder is an encoder that generates a bit stream that has been successfully decoded by the audio decoder described in Embodiment 1; this audio encoder includes: a first encoding unit 700, a first Conversion unit 701, second conversion unit 702, first division unit 703, second division unit 704, third division unit 705, fourth division unit 706, second encoding unit 707, third encoding unit 708, and formatter 709.

[0173] The first encoding unit 700 encodes a signal obtained by downmixing two audio signals.

[0174] The first conversion unit 701 converts the first audio signal into a frequency domain signal, and the second conversion unit 702 converts the second audio signal into a frequency domain signal.

[0175] The first division unit 703 d...

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Abstract

An audio decoder for reproducing original signals from a bit stream including the downmix signals of a plurality of the original signals and auxiliary information representative of the gain ratio D and phase difference theta between the original signals, comprising a decoding part (100) for extracting the downmix signals form the bit stream; a transforming part (101) for transforming the extracted downmix signals to signals of frequency domain; a phase rotator determining part (102) for determining two phase rotators having their respective phase rotation angles a and ss that are obtained by dividing, with a diagonal line, a contained angle of a parallelogram, the length ratio of two adjacent lines of which is equal to the gain ratio D and the contained angle of which is equal to the phase difference theta; a separating part (103) for separating the signals of frequency domain to two separated signals whose phase differences than the decoded downmix signals are the angles alpha and beta, respectively; and an inverse transforming part (104) for inverse transforming the two separated signals into respective signals of time domain to reproduce the two audio signals.

Description

technical field [0001] The present invention relates to a decoder that decodes an original signal based on auxiliary information indicating the relationship between a signal that downmixes a plurality of original signals and the original signal, and in particular, the present invention relates to a phase difference between the original signals and In the case of gain ratio, high-precision decoding technology of the original signal. Background technique [0002] In recent years, a technology called Spatial Codec (Spatial Codec) is being developed. Its purpose is to compress and encode multi-channel presence with a very small amount of information. For example, AAC (Advanced Audio Coding), a multi-channel codec that has been widely used as a digital TV sound method In this way, 5.1 channels must have a bit rate of 512kbps or 384kbps. However, in Spatial Codec, the goal is to compress and encode multi-channel signals with a very small bit rate of 128kbps, 64kbps, or even 48kbp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/008
Inventor 宫阪修二高木良明田中直也津岛峰生
Owner PANASONIC CORP
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