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Method and device for efficient binaural sound spatialization in the transformed domain

A technology of spatialization and transformation domain, applied in the field of spatialization, can solve problems such as subband frequency aliasing and application complexity

Active Publication Date: 2011-03-30
FRANCE TELECOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0039] However, in the above case, the application of HRTF filtering operation is very complicated, because the latter requires the use of subband filters with a fixed minimum length and the frequency aliasing of subbands must be considered

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  • Method and device for efficient binaural sound spatialization in the transformed domain
  • Method and device for efficient binaural sound spatialization in the transformed domain
  • Method and device for efficient binaural sound spatialization in the transformed domain

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Embodiment Construction

[0067] to combine Figure 2a and the following figures, the method for sound spatialization of an audio scene according to the subject matter of the present invention will be described in detail.

[0068] The method according to the invention is applicable to an audio scene, such as a 3D audio scene, represented as comprising N channels, where N is greater than or equal to 1, which are spatially coded on a given number of frequency subbands and in the transform domain to decode.

[0069] Transform domain, understandably, means a transformed frequency domain, such as Fourier domain, PQMF domain or any hybrid domain, obtained by time domain decimation or other steps to create additional frequency domain subbands.

[0070] The spatially coded channels forming the first set of N channels are then denoted in non-limiting form as the Fl, Fr, Sr, Sl, C, lfe channels described earlier in this specification and as described earlier in the specification Corresponds to the decoding mode...

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Abstract

The invention concerns a method and a system for sound spatialization of a first set of not less than one of the audio channels encoded on of a number of frequency subbands (SBk) and decoded in a transformed domain (Fl, C, Fr, Sr, SI, Ife) into a second set of not less than two (Bl, Br) sound channels in the time domain, from modelling filters converted into a gain and a delay applicable in the transformed domain involving: filtering (A) through equalization, subband delay of the signal by applying at least one gain and one delay to generate from each of said encoded channels an equalized anddelayed component; adding (B) a subset of equalized and delayed signals to create a number of filtered signals corresponding to not less than two; synthesizing (C) each of said filtered signals to obtain the second set of not less than two reproduction sound channels (Bl, Br) in the time domain.

Description

technical field [0001] The present invention relates to spatialization of compressed audio signals, commonly referred to as 3D-rendered sound. Background technique [0002] The above-mentioned operations are performed, for example, in decompressing a compressed 3D audio signal, for example, decompressing the signal represented by a certain number of channels into different numbers of channels, such as 2 channels, to represent, allowing for reconstruction of 3D audio effects on a pair of headphones. [0003] Hence, the term "binaural" is used to reconstruct an audio signal on a pair of stereo headphones and still have spatialization effects. The invention is not limited to the aforementioned techniques, but the invention is clearly applicable to techniques derived from "binaural" techniques, such as those known as The reconstruction technique, in other words, the technique of reconstructing the audio signal on a remote speaker. It is a commercial trademark of COOPER BAUC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04S3/02G10L19/00G10L19/02
CPCH04S3/008H04S1/007H04S3/02
Inventor 马克·埃默里皮耶里克·菲利普达维德·维雷特
Owner FRANCE TELECOM SA
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