A Method of Using Random Array to Realize the Focusing of Reverberation Sound Field

A technology of random array and reverberation sound field, applied in the direction of sound-generating equipment, instruments, etc.

Active Publication Date: 2011-12-28
INST OF ACOUSTICS CHINESE ACAD OF SCI
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the existing sound field focusing method, thereby proposing a method for realizing reverberant sound field focusing by using a random array, the method retransmits the received signal by the random array after inverting the time domain The principle of space-time domain focusing at the receiving point realizes the reverberation sound field focusing when the array elements are randomly arranged and the frequency response between the array elements is different.

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
  • A Method of Using Random Array to Realize the Focusing of Reverberation Sound Field
  • A Method of Using Random Array to Realize the Focusing of Reverberation Sound Field
  • A Method of Using Random Array to Realize the Focusing of Reverberation Sound Field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] In this embodiment, as figure 1 As shown, on the ground of the reverberation room (length 5.1m, width 4.9m, height 4.0m), 4 speaker units with a power of 20W are randomly placed to form an array, and a microphone unit is placed at the desired focus point for Measure the received signal at the desired point, place another microphone directly in front of the focus point, and move the position of the microphone forward at an interval of 3 cm to measure the focus signal at other locations other than the desired location point. Use the Pulse instrument of the Danish B&K company to record the received signals collected by the two microphones, and write the code on the matlab software of the PC to realize the time domain inversion and amplitude amplification of the received signal recorded by the Pulse instrument corresponding to the desired focus point .

[0071] The specific implementation process of this embodiment includes the following steps:

[0072] 1) First set the sampli...

Embodiment 2

[0079] In this embodiment, as figure 2 As shown, 4 loudspeaker units are randomly placed on the floor of the reverberation room, and the single-period sine pulse signals with frequencies of 600 Hz, 1000 Hz, and 3000 Hz are mixed in a 4-element random array according to the three steps described in Example 1. Sound field focusing experiment.

[0080] When the microphone unit slides along the X-axis, Y-axis and Z-axis at 3cm intervals, the sound pressure peaks of the focus signals corresponding to these three frequency source signals are measured with the distance difference on the three coordinate axes (the position of the microphone) And the desired focus point). Picture 10 , 11 And 12 respectively give the normalized distribution curves of the peak sound pressure of the focus signal corresponding to the source signal with frequencies of 600 Hz, 1000 Hz, and 3000 Hz on the X-axis, Y-axis and Z-axis.

[0081] Comparing these curves, it can be seen that the spatial scale of the foc...

Embodiment 3

[0083] In this embodiment, as image 3 As shown, in the reverberation room, the 4-element line arrays are respectively placed at the locations of the 4 speaker units mentioned in Example 2. Also in accordance with the three steps described in Example 1, at these 4 locations The four-element linear array reverberation sound field focusing experiments were performed on single-period sine pulse signals with frequencies of 600 Hz, 1000 Hz, and 3000 Hz, respectively, and the reverberation sound field focusing experimental results of the 4-element linear array and the 4-element random array were compared.

[0084] When the microphone unit slides along the X-axis, Y-axis and Z-axis at 3cm intervals, the sound pressure peaks of the focus signals corresponding to these three frequency source signals are measured with the distance difference on the three coordinate axes (the position of the microphone) And the desired focus point). Figure 13 , 14 And 15 are when the linear array is placed ...

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 a method for realizing focusing of a reverberation sound field by using a random array. The method comprises the following steps: 1) the random array transmits the same source signal synchronously in a reverberation environment, and at the same time starts to record the sound collected by a microphone at a desired position. Receive the signal; 2) Perform time-domain inversion and amplitude amplification processing on the recorded received signal; 3) Transmit the time-domain inversion signal amplified in step 2) by a random array again, thereby generating acoustic focus at the desired position . The advantages of the present invention are: the array elements can be arranged randomly; the focus blur caused by the phase difference between the array elements can be completely eliminated; function, which relieves the computational burden; the distance between array elements breaks through the half-wavelength limit; in the case of the same number of array elements, the spatial resolution of random array focusing is slightly greater than that of linear array focusing.

Description

Technical field [0001] The present invention relates to the technical field of sound field control. Specifically, the present invention particularly relates to a method for realizing reverberation sound field focusing by using a random array. Background technique [0002] Sound field focusing is to increase the sound intensity as much as possible in a desired area of ​​space, and to reduce the sound intensity at any point outside the area as much as possible. In order to achieve the sound field focusing, the amplitude and phase of the array elements are usually adjusted to change the spatial distribution of the radiated power of the array, so that the radiated power falls within the desired area to the greatest extent, and the power to other areas is minimized. Give way. The sound field focus can control the sound in a certain desired area to achieve the best reception effect in this area and avoid the interference of sound to other areas. [0003] When the sound source sounds in...

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 Patents(China)
IPC IPC(8): G10K11/16G10K15/08
Inventor 杨军马登永匡正
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap