A real-time sound source orientation method based on sound intensity difference effect
A sound source and effect technology, applied in direction finders using ultrasonic/sonic/infrasonic waves, systems for determining direction or offset, etc. The effect of low system overhead and simple method operation
Active Publication Date: 2018-07-13
江苏高新兴机器人有限公司
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However, there are some inherent shortcomings in the method based on time delay estimation: most of the methods for estimating time delay use the cross-correlation method and its various improved methods, and the accuracy of the cross-correlation method is affected by the sampling rate of the signal, and the higher the sampling rate , the higher the accuracy of time delay estimation, which has special requirements on the signal sampling rate, which increases the overhead of the system
Moreover, the implementation of the algorithm is complicated, and a large number of mathematical models such as Fourier transform, cross-correlation method, least square method, covariance, etc. need to be used in the process of signal processing and noise processing, which also increases the system overhead; in addition, the traditional positioning method is also easy. Affected by reverberation
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[0048] The principle adopted by the present invention is as follows figure 1 As shown, a plane rectangular coordinate system is constructed with a cross matrix, the ac direction is the X axis of the coordinate system, the ac distance is 30cm, the db direction is the Y axis of the coordinate system, and the db distance is also 30cm. When a sudden sound signal is transmitted to the cross array from a certain direction, the four pickups will detect the sound signal successively. Take the transient sound intensity when the four pickups just detected the sound, subtract the sound intensity of c from the sound intensity of a to get the vector sound intensity V1 in the X-axis direction, and subtract the sound intensity of b from the sound intensity of d to get the Y-axis The vector sound intensity V2 in the direction. The pickups are subtracted in pairs to eliminate the effects of ambient noise. Using V1 and V2, the direction of the sudden sound in the coordinate system can be obta...
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The invention discloses a sound-intensity-difference-effect-based real-time sound source orientation method. A four-element cross pick-up unit is used for carrying out sound source direction detection; and a smoothing algorithm is employed during a processing and orientation process of a detected sound source signal. With the method, a sound direction can be determined in real time according to a sudden sound signal; and the influence on sound source direction determination by the system by an echo can be avoided. And the system costs are low.
Description
technical field [0001] The invention belongs to the technical field of sound source orientation, and in particular relates to a real-time sound source orientation method based on sound intensity difference effect. Background technique [0002] Most of the current research and applications are mostly based on time-delay estimation. This method is completed in two steps. The first step is to process the signals received by each microphone to estimate the time delay; the second step is to calculate the spatial orientation of the sound source based on the spatial structure of the microphone and the time delay estimated in the first step. . However, the method based on time delay estimation has some inherent shortcomings: most of the methods for estimating time delay use the cross-correlation method and its various improved methods, and the accuracy of the cross-correlation method is affected by the sampling rate of the signal, the higher the sampling rate. , the higher the acc...
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IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 覃学松黄洪加俞翔刘玉姣黄仝宇宋一兵汪刚柏林刘双广
Owner 江苏高新兴机器人有限公司