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An indoor sound field speaker playback method based on the equivalent source method

A loudspeaker and equivalent source technology, which is applied in the field of spatial sound field playback, can solve problems such as large playback errors, and achieve good effects, high operability, and fast calculation speed

Active Publication Date: 2022-07-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the control point of this method is limited to the measurement point of the microphone, and the playback error is large

Method used

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  • An indoor sound field speaker playback method based on the equivalent source method
  • An indoor sound field speaker playback method based on the equivalent source method
  • An indoor sound field speaker playback method based on the equivalent source method

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Experimental program
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Embodiment Construction

[0039] The present invention will now be further described in conjunction with the embodiments and accompanying drawings:

[0040] Step 1: Determine the location of the speaker array. The arrangement form of the loudspeaker array can be a line array, a plane array, a ring array, a spherical array, etc. as required, or it can be a randomly arranged loudspeaker array. The number of speakers is L. Sets the placement of the speaker array in the room. It can be placed against the wall, or according to the needs, the speaker array can be arranged at the desired sound field boundary.

[0041] Step 2: Set the target sound field area. The target sound field area is usually the spatial sound field position expected by the listener in the room. Place microphones at the boundary of the target sound field area and measure the room impulse response from each speaker to each microphone. In the measurement frequency range, the peak sound pressure level generated by the impulse sound sour...

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Abstract

The invention relates to an indoor sound field loudspeaker reproducing method based on an equivalent source method. The acoustic transfer function from the speakers in the area to the predicted point is obtained by using the inverse operation of the sound field to obtain the driving function of the speaker array. The sound field inverse operation is usually ill-posed and ill-posed, and a regularization method is used to ensure the stability of the solution. The regularization method chooses Tikhonov regularization. The invention uses the equivalent source method to interpolate the sound transfer function of the loudspeaker array to reproduce the sound field. Compared with the currently used sound pressure matching method, the invention increases the degree of freedom of the arrangement of the loudspeaker array and the microphone array, is more economical and practical, and has a high degree of operability. The calculation speed is fast, and the playback effect is high in precision. In closed space sound field playback, good results can be achieved.

Description

technical field [0001] The invention belongs to the technical field of spatial sound field playback, and relates to an indoor sound field speaker playback method based on an equivalent source method. Background technique [0002] Sound Field Reproduction (SFR) aims to reproduce a complete acoustic environment or synthesize a desired acoustic scene. Spatial sound field playback technology is a method of providing the listener with a spatial stereo experience through headphones or multiple speakers. Using earphones to replay the sound field is a relatively convenient method, but if wearing earphones for a long time will cause discomfort to the ears, and earphone reproduction is also insufficient in terms of spatial positioning. Therefore, for multiple listeners, to realize the reproduction of spatial sound, it is necessary to use a speaker reproduction method. In order to avoid complicated calculations in the playback process of speaker arrays, "an iterative method for speak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R5/02H04S7/00
CPCH04R5/02H04S7/302H04R2205/024
Inventor 曾向阳洪汐杜博凯路东东
Owner NORTHWESTERN POLYTECHNICAL UNIV