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Three-dimensional sound field synthesizing method aiming at sub-Band coding audio

A sound field synthesis, sub-targeted technology, applied in speech analysis, code conversion, electrical components and other directions, can solve problems such as large computational workload, and achieve the effect of reducing computational complexity

Inactive Publication Date: 2011-08-24
昆山杰得微电子有限公司
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Problems solved by technology

The processing flow of split-band duplex synthesis is as follows: figure 2 As shown, it directly processes the time-domain signal of the target audio, and can achieve a good simulation effect when the frequency band is divided finely; but the fly in the ointment is that this method requires additional sub-band filtering and synthesis of the sound signal, making The additional computational effort is significant

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  • Three-dimensional sound field synthesizing method aiming at sub-Band coding audio
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  • Three-dimensional sound field synthesizing method aiming at sub-Band coding audio

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Embodiment Construction

[0017] The specific implementation method of the present invention will be described below using a binaural earphone as a playback device, but it should be emphasized that the present invention is not limited to the application of earphones.

[0018] Such as figure 2 As shown, in the three-dimensional sound field synthesis process based on the band-division duplex theory, the audio to be processed is filtered by the band-division filter bank, and n sub-band signals of different frequency band ranges are output. The sub-band signals with the same frequency in the left and right channels are input to their corresponding ITD / IID adjustment units (band-division duplex adjustment units) to adjust each other's ITD and IID. The adjusted sub-band signals are grouped according to the channels, input to the integrated filter banks of the respective channels, and synthesized into the final playing time-domain signals.

[0019] The subband filter bank used for subbanding has nothing to ...

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Abstract

The invention discloses a three-dimensional sound field synthetic method aiming at sub-band coding audio; with a standard decoding flow stipulated by an audio format as the base, an audio data flow is decoded; an ITD / IID adjusting unit is inserted in the front of an integrated filter bank of the standard decoding flow; an input signal of the ITD / IID adjusting unit is a sub-band signal which is obtained after being decoded through the standard decoding flow; an output signal is a sub-band signal which is adjusted through the ITD / IID adjusting unit and has the same format with the input signal; the output signal is sent to the integrated filter bank of the standard decoding flow for processing. The invention can reduce the workload of calculation, achieve high-fidelity and can be suitable for earphone playback and loudspeaker playback simultaneously.

Description

technical field [0001] The invention relates to a duplex three-dimensional sound field synthesis method based on sub-band processing, in particular to a three-dimensional sound field synthesis method based on various sub-band codes (such as mp3, AC3, AAC, etc.) audio. Background technique [0002] When people listen to the sound, they can not only hear the content and strength of the sound, but also hear the direction of the sound. Various recording and playback technologies can easily record information such as the content and strength of the original sound, but the direction information is often unable to be preserved. The recording and playback technology that reproduces the directional information of the original sound by using various acoustic and auditory psychology principles is called three-dimensional sound field synthesis (or three-dimensional virtual sound source, three-dimensional sound field reconstruction, etc.). [0003] Duplex theory is one of the important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/02H03M7/30
Inventor 欧阳合王阳周毅王新成黄娟徐晖顾群楠
Owner 昆山杰得微电子有限公司
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