Microphone array in sound source orienting device

A microphone array and directional device technology, which is applied to parts of ultrasonic/sonic/infrasonic directional devices, systems for determining direction or offset, and direction finders using ultrasonic/sonic/infrasonic waves. Convenient transportation and portability, reducing the adaptability and practicability of sound source localization devices, etc.

Active Publication Date: 2014-09-17
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a microphone array in the sound source directional device, which is composed of four microphones, a support frame, a rotating rod, a rotating shaft and an angle measuring mechanism, and the rotating rod of the microphone array in the sound source directional device It can rotate along the rotation axis. When in use, the microphone array is opened along the axis to form different angles. The four microphones present an array of geometric structure changes in the three-dimensional space, thereby completing multi

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Embodiment 1

[0056] according to the above figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 The illustrated embodiment is used to assemble the microphone array in the sound source directional device of the cost embodiment, including four microphones, microphone IS1, microphone IIS2, microphone IIIS3 and microphone IVS4, support frame 1, rotating rod 2, rotating shaft 4 and angle measuring mechanism 9. The included angle measurement mechanism 9 includes a rotary potentiometer 3 , a hub plug 5 , a power supply 8 , a microcontroller 6 , a serial port 7 and a PC host computer 13 .

[0057] In the microphone array in the sound source directional device of the present embodiment, the microphone is the MPA201 microphone produced by Beijing Shengwang Shengdian Technology Co., Ltd., and its diameter is 1.27cm; the support frame 1 is a rigid material, and each side of its triangle The side length is 42cm, the width is 2cm, and the thickness is 0...

Embodiment 2

[0059] In the positioning method of the array, the sound waveform collected by the microphone array in the sound source directional device of embodiment 1 is sent to the hardware connection mode of the PC upper computer 13 as follows: Figure 11 Examples are shown. In the present embodiment, the power supply device 10 is an MC104 power supply device, the data acquisition card 12 is a NI9215A data acquisition card, and the PC host computer 13 uses the software MATLAB, and the written MATLAB program mainly completes the following functions:

[0060] A. Realize serial port debugging, obtain and display the array angle;

[0061] B. filter and denoise the target sound source information collected by the four microphones of the array of the present invention, and calculate the time difference t between the arrival of the target sound source at the four microphones according to the generalized cross-correlation algorithm i1 (i=2,3,4), that is, the target sound source signal reaches ...

Embodiment 3

[0077]In addition to selecting the position of the target sound source according to the measured environmental conditions, set the radian value of its yaw angle relative to the array to be 1.1071, and the radian value of the pitch angle to be 1.1503; The sound source information and the sound signal are transmitted to the upper computer 13 through the data acquisition card. The rotating rod 2 in the microphone array in the sound source directional device rotates through an angle, and at this time the array included angle θ2=1.3090; the time difference for the host computer 13 to obtain the microphone is: the time difference t from the sound source to the microphone II S2 and the microphone IS1 21 48×10 -5 s (seconds), the time difference t from the sound source to microphone IIIS3 and microphone IS1 31 Yes - 59×10 -5 s, time difference t from sound source to microphone IVS4 and microphone IS1 41 Yes - 37×10 -5 s; the calculated radian value of the target sound source yaw a...

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Abstract

The invention relates to a device for matched positioning by repeatedly determining the direction of a target through sound wave application, in particular to a microphone array in a sound source orienting device. The microphone array in the sound source orienting device comprises four microphones, a supporting frame, a rotating bar, a rotating shaft and an included angle measuring mechanism. The rotating bar of the microphone array in the sound source orienting device can rotate along the rotating shaft, in the using process, the microphone array is opened along the shaft, so that different included angles are formed, the four microphones form a geometric structure change array in three-dimensional space, hence, the target can be repeatedly oriented, the orienting accuracy is improved, when the microphone array is not used, the rotating bar of the microphone array is rotated to be in the state that the array included angle is zero degree, and the defects that a microphone array in an existing sound source orienting device is fixed in structure, so that the occupied space is large, transporting and carrying are not convenient, in the target locating process, a single array is used for receiving sound source signals, locating can be limited by the size and the geometric structure of the array easily, and thus the adaptability and practicability of the sound source orienting device are greatly lowered can be overcome.

Description

technical field [0001] The technical solution of the present invention relates to a device for coordinating positioning by using sound waves to determine the direction of a target multiple times, specifically the microphone array in the sound source directional device. Background technique [0002] In many research fields such as robot navigation, speech enhancement, and target positioning, auditory perception technology has always been a research focus and hot topic. The sound source directional device with exquisite design, high precision and portability has important application value in many fields such as medical treatment, search and rescue, military and national defense. [0003] The microphone array used in the existing sound source directional device has a fixed structure and is bulky, and moving the array is time-consuming and labor-intensive and is likely to damage its components, which brings great difficulties to the sound source directional device to carry and ...

Claims

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Application Information

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IPC IPC(8): G01S3/801G01S3/802
CPCG01S3/80G01S3/802
Inventor 孙昊范智美杨鹏陈萌徐勤奇
Owner HEBEI UNIV OF TECH
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