Unlock instant, AI-driven research and patent intelligence for your innovation.

Indoor sound field loudspeaker playback method based on equivalent source method

A loudspeaker, equivalent source technology, applied in the field of spatial sound field playback, can solve problems such as large playback errors

Active Publication Date: 2021-09-14
NORTHWESTERN POLYTECHNICAL UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Indoor sound field loudspeaker playback method based on equivalent source method
  • Indoor sound field loudspeaker playback method based on equivalent source method
  • Indoor sound field loudspeaker playback method based on equivalent source method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

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

[0041] Step 2: Set the target sound field area. The target sound field area is usually the position of the spatial sound field expected by the listener in the room. Microphones are placed at the boundaries of the target soundfield area, and the room impulse response from each speaker to each microphone is measured. Within the measurement frequency range, the peak sound pressure level generated by the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an indoor sound field loudspeaker playback method based on an equivalent source method, which comprises the following steps: measuring room impulse response at the boundary of a target playback area, obtaining a sound transfer function in a frequency domain by using FFT, interpolating a sound transfer function from a loudspeaker in the playback area to a prediction point by using the equivalent source method, performing sound field inverse operation, and solving a driving function of the loudspeaker array. The inverse operation of the sound field is usually ill-conditioned and has discomfort, and the solution stability is ensured by using a regularization method. Tikhonov regularization is selected as a regularization method. According to the method, an equivalent source method is used for interpolating a loudspeaker array sound transfer function for sound field playback, compared with a currently used sound pressure matching method, the degree of freedom of arrangement of a loudspeaker array and a microphone array is increased, and the method is more economical and practical, high in operability, high in calculation speed and high in playback effect precision. A good effect can be achieved in sound field playback in a closed space.

Description

technical field [0001] The invention belongs to the technical field of spatial sound field reproduction, and relates to a method for reproducing indoor sound field loudspeakers 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 to provide listeners with a spatial stereo experience through headphones or multiple speakers. Using headphones to replay the sound field is a relatively convenient method, but if you wear headphones for a long time, it will cause discomfort to the ears, and there are also deficiencies in spatial positioning in headphone playback. Therefore, for multiple listeners, the reproduction of spatial sound requires the use of loudspeaker reproduction. In order to avoid complicated calculations during speaker array playback, "An iterative method for speaker layout optimiz...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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