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Method and device for controlling broadband sound field of loudspeaker array by utilizing secondary residual sequence

A technology of quadratic residual sequence and loudspeaker array, which is applied to frequency/direction characteristic devices and other directions, and can solve problems such as insufficient optimization and limited performance

Active Publication Date: 2012-10-03
SUZHOU SONAVOX ELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0013] The object of the present invention is to provide a loudspeaker array broadband sound field control method and device using a quadratic residual sequence to overcome the limited performance and insufficient optimization of the array sound field based on a single specific quadratic residual sequence. question

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  • Method and device for controlling broadband sound field of loudspeaker array by utilizing secondary residual sequence
  • Method and device for controlling broadband sound field of loudspeaker array by utilizing secondary residual sequence
  • Method and device for controlling broadband sound field of loudspeaker array by utilizing secondary residual sequence

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Embodiment 1

[0164] In this embodiment, assuming that the frequency of the sound source signal is 5 KHz, the sound field radiation model of the array is established according to the input parameters of the speaker array (number of array elements, array element spacing, speaker aperture, array element position, and observation point position), and then The specified quadratic residual sequence is divided into blocks and the subsequences are combined sequentially to generate a combined sequence, and each phase delay vector is designed by using each combined sequence as follows: , ,..., , use these phase delay vectors to control the loudspeaker array sequentially, and each sound pressure magnitude vector after control is: , ,..., , calculate the variance sequence of these sound pressure magnitude vector sequences as: , ,..., , through analysis and comparison, find out the sequence index number corresponding to the minimum variance element in the variance sequence, and the p...

Embodiment 2

[0168] In this embodiment, assuming that the frequency of the sound source signal changes point by point from 100 Hz to 20 KHz at a frequency interval of 100 Hz, we compare and analyze the uniformity of the spatial sound field distribution of the array in three cases at each frequency point.

[0169] Case 1: In this case, no phase delay control is applied to the array, and the sound pressure distribution characteristics of the array in the desired area are observed when a single-frequency input is made.

[0170] Case 2: In this case, we use the phase delay vector designed based on a single quadratic residual sequence proposed in Document 6 to perform delay control on the array, and observe the sound pressure distribution of the array in the expected radiation area when a single frequency is input characteristic. In this case, the quadratic residual sequence is , the phase delay vector designed according to this sequence is , use this phase delay vector to realize t...

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Abstract

The invention discloses a method and a device for controlling a broadband sound field of a loudspeaker array by utilizing a secondary residual sequence. The method comprises the following steps: carrying out multichannel FFT (fast Fourier transform); carrying out multichannel multi-subband equilibrium processing; carrying out multichannel multi-subband phase delay processing; carrying out IFFT (inverse fast Fourier transform); and sending a multichannel time domain sequence to a multichannel power amplifier to drive the loudspeaker array to generate a uniform sound field. The device comprises a sound source, a multichannel FFT transformer, a multichannel multi-subband equalizer, a parameter estimator for multichannel equilibrium, a multichannel multi-sub-band phase delayer, an optimal phase delay estimator, a multichannel IFFT transformer, the multichannel power amplifier and the loudspeaker array which are successively and sequentially connected. The method and the device can be used for effectively expanding the coverage area of a broadband array space radiation sound field and improving the uniformity degree of the broadband array space radiation sound field, so that the requirement on the sound field space distribution quality of a broadband array sound amplification system is met.

Description

technical field [0001] The invention relates to a loudspeaker array broadband sound field control method and device, in particular to a loudspeaker array broadband sound field control method and device using a quadratic residual sequence. Background technique [0002] In large-space audio-visual venues such as large halls, stadiums, open-air plazas, railway stations, and airports, the traditional sound reproduction system based on multiple loudspeakers placed separately has serious interference effects in the spatial sound field radiated by multiple loudspeakers. , will cause more peaks and valleys in the superimposed sound field of multiple speakers in space, especially as the frequency of the radiation signal increases, the unevenness of the spatial distribution of the superimposed sound field will become more serious. In order to solve the problem of uniform coverage of the sound field in large spaces, the design of an array system based on multiple loudspeaker units has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/20
Inventor 马登永
Owner SUZHOU SONAVOX ELECTRONICS
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