Audio signal encoding device, audio signal decoding device, method thereof and program

A technology of audio signal coding and signal coding, which is applied in voice analysis, stereo systems, instruments, etc., and can solve the problems of multi-calculation and calculation cache calculation unit power consumption and cost

Inactive Publication Date: 2007-02-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of reproduction with two speakers or earphones, a large amount of calculation and a buffer for calculation are required, which in turn increases the power consumption and cost of the calculation unit such as the DSP where it is installed.

Method used

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  • Audio signal encoding device, audio signal decoding device, method thereof and program
  • Audio signal encoding device, audio signal decoding device, method thereof and program
  • Audio signal encoding device, audio signal decoding device, method thereof and program

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The auxiliary information generation unit according to the first embodiment will be described with reference to FIGS. 3 to 5 .

[0051] FIG. 3 is a block diagram showing a functional configuration of a supplementary information generation unit in the first embodiment.

[0052] The auxiliary information generating unit of the first embodiment generates auxiliary information 205A encoded differently according to the channel information 207 from the first input signal 201 and the second input signal 202. The inter-signal level difference calculating unit 303, An inter-signal phase difference calculation unit 304 , a perceptual direction estimation unit 305 , and an encoding unit 306 are configured.

[0053] The auxiliary information 205A is a combination of the inter-signal level difference calculated by the inter-signal level difference calculation unit 303 , the inter-signal phase difference calculated by the inter-signal phase difference calculation unit 304 , and the p...

Embodiment 2

[0078] The auxiliary information generation unit according to the second embodiment will be described with reference to FIGS. 6 and 7 .

[0079] FIG. 6 is a block diagram showing a functional configuration of a supplementary information generation unit in the second embodiment.

[0080] The auxiliary information generating unit of the second embodiment is a part that generates auxiliary information 205B encoded based on the channel information 207 from the first input signal 201 and the second input signal 202, and the inter-signal correlation calculation unit 401, the sense of diffusion The estimation unit 402 and the encoding unit 403 are configured.

[0081] Here, the auxiliary information 205B is obtained by quantizing and encoding at least one of the inter-signal correlation calculated by the inter-signal correlation calculation unit 401 , the inter-signal similarity, and the diffuse feeling estimation value calculated by the diffuse feeling estimation unit 402 . informa...

Embodiment 3

[0105] A supplementary information generation unit related to the third embodiment will be described using FIG. 8 .

[0106] FIG. 8 is a block diagram showing the functional configuration of a supplementary information generation unit according to the third embodiment.

[0107] The auxiliary information generating unit of the third embodiment is a part that generates auxiliary information 205C encoded based on the channel information 207 from the first input signal 201 and the second input signal 202, and the inter-signal correlation calculation unit 401, the sense of distance estimation The unit 502 and the encoding unit 503 are composed.

[0108] Here, the auxiliary information 205C is information obtained by quantizing and encoding at least one of the inter-signal correlation calculated by the inter-signal correlation calculation unit 401 , the inter-signal similarity, and the estimated distance value calculated by the distance estimation unit 502 . .

[0109] The first i...

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Abstract

An audio signal encoding device includes a downmix signal encoding unit 203 and an auxiliary information generation unit 204 . The downmix signal encoding unit 203 generates a downmix signal acquired by adding input signals each other using a predetermined method, encodes the downmix signal, and outputs downmix signal information 206 . The auxiliary information generation unit 204 generates auxiliary information 205 using the downmix signal and the downmix signal information 206 generated by the downmix signal encoding unit 203 . The auxiliary information generation unit 204 efficiently quantizes the auxiliary information 205 using human's characteristics of a perceptual direction of a sound source, a perceptual broadening, and a perceptual distance.

Description

technical field [0001] The present invention relates to an audio signal encoding device, decoding device, method and program. Background technique [0002] As a conventional audio signal encoding method and decoding method, known methods include the ISO / IEC international standard method, commonly known as the MPEG method, and the like. Currently, ISO / IEC 13818-7, commonly known as MPEG2 AAC (Advanced Audio Coding, Advanced Audio Coding), etc., are widely used as high-quality coding methods even at low bit rates. There are currently multiple specification extensions to this approach. [0003] As one of them, there is a technology using information called spatial acoustic information (Spatial Cue Information) or auditory acoustic information (Binaural Cue). As an example of such a technology, there is a parametric stereo (Parametric Stereo) method specified in MPEG-4 Audio (ISO / IEC 14496-3), which is an ISO international standard specification (see Non-Patent Document 1). I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H04S3/00H04S7/00
CPCH04S3/00
Inventor 饭田一博津岛峰生高木良明田中直也
Owner PANASONIC CORP
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