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Improved head related transfer functions for panned stereo audio content

A technology of loudspeaker and virtual sound source, which is applied in stereophonic devices, stereophonic systems, quasi-stereophonic systems, etc., and can solve problems such as inaccuracy

Active Publication Date: 2007-09-19
DOLBY LAB LICENSING CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Likewise, splitting the signal unevenly between the left and right channel inputs followed by binauralization by, for example, a binauralizer as shown in Figure 2 does not correctly create the illusion of the desired virtual position of the sound source between the virtual left and right speakers

Method used

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  • Improved head related transfer functions for panned stereo audio content
  • Improved head related transfer functions for panned stereo audio content
  • Improved head related transfer functions for panned stereo audio content

Examples

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Embodiment Construction

[0070] One aspect of the invention is a binauralizer and a binauralization method that, for the case of a stereo input pair, uses a measured or assumed pair of HRTFs for two sound sources located at a first sound source angle and a second sound source angle Binauralize a stereo input pair for more than two source angles, for example, to create signals that move between stereo input pairs from a source at a third source angle that lies between the first and second source angles hallucinations.

[0071] Figure 3 shows examples of HRTFs for three sound source angles, the first azimuth denoted as θ, for the virtual left speaker, and for the virtual right speaker, under the assumption of symmetry in Fig. 3 is the angle of -θ, and the central virtual speaker located at an angle of 0 degrees, that is, in the center of the left and right virtual speakers. For the center virtual speaker, HRTF pairs are denoted as pairs HRTF(0,L) and HRTF(0,R), respectively. The virtual left speaker H...

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Abstract

A method to process audio signals, an apparatus accepting audio signals, a carrier medium that carried instructions for a processor to implement the method to process audio signals, and a carrier medium carrying filter data to implement a filter of audio signals. The method includes filtering a pair of audio input signals by a process that produces a pair of output signals corresponding to the results of: filtering each of the input signals with a HRTF filter pair, and adding the HRTF filtered signals. The HRTF filter pair is such that a listener listening to the pair of output signals through headphones experiences sounds from a pair of desired virtual speaker locations. Furthermore, the filtering is such that, in the case that the pair of audio input signals includes a panned signal component, the listener listening to the pair of output signals through headphones is provided with the sensation that the panned signal component emanates from a virtual sound source at a center location between the virtual speaker locations.

Description

technical field [0001] The present invention relates to the field of audio signal processing, and more particularly to processing sound channels through filters to provide a perception of spatial dimension, including correct localization of a moving signal when listening with a binaural or transaural playback system. Background technique [0002] FIG. 1 shows a general binaural playback system including processing multiple channels through multiple head-related transfer function (HRTF) filters, such as FIR filters, to provide the listener 20 with a specific direction for each input channel. impression that appears. Fig. 1 shows the information of N audio sources consisting of the first channel 11 (channel 1), the second channel (channel 2), ..., and the Nth channel 12 (channel N) of information deal with. A binaural playback system is used for playback using a pair of headphones 19 worn by a listener 20 . Each channel is processed by a pair of HRTF filters, one for playba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S5/00H04R5/02
CPCH04S3/00H04S2400/01H04S2420/01H04S5/00H04R5/00H04R5/02
Inventor 大卫·S.·麦克格拉斯
Owner DOLBY LAB LICENSING CORP
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