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Time domain broadband harmonic region beam former and beam forming method for spherical array

A technology of harmonic domain and shaper, which is applied in the field of spherical microphone array, beamformer of spherical hydrophone array and its beamforming field, can solve the problem of not giving the implementation method, not specifying the filter, and not considering the beamformer other performance issues

Active Publication Date: 2013-06-26
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the main disadvantage of frequency-domain beamforming is that since it is a block process, there is an inevitable delay between beam output and input, which cannot be used in some applications that require real-time listening (for example: listening to speech signals)
However, the patent does not give a specific implementation method, does not indicate what kind of filter to use, and does not give a design method for the filter
Moreover, this method introduces a division operation when calculating harmonics, so that the beamformer is less robust when the divisor is particularly small at some frequencies
Also, it does not take into account other properties of the beamformer, such as SNR gain, sidelobe levels, etc.

Method used

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  • Time domain broadband harmonic region beam former and beam forming method for spherical array
  • Time domain broadband harmonic region beam former and beam forming method for spherical array
  • Time domain broadband harmonic region beam former and beam forming method for spherical array

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Embodiment Construction

[0112] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0113] The time-domain broadband harmonic domain beamformer of this embodiment, the beamformer includes the following steps:

[0114] Step 1): Construct various performance parameters of the time-domain broadband harmonic domain beamformer, including: beam response, directivity index, white noise gain, broadband main lobe response with frequency consistency and side lobe size, etc.), specifically:

[0115] First, according to the matrix model, the modes b of each order of the matrix are obtained n (ka), where a is the spherical radius, k=2πf / c represents the wave number, c represents the speed of sound, and f represents the frequency;

[0116] Then, according to each mode b n (ka) Calculate the array manifold vector u(f, Θ) in the broadband harmonic domain, and then construct the beam response expression B(f, Ω), where Θ is the beam pointing ...

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Abstract

The invention relates to a time domain broadband harmonic region beam former and a beam forming method for a spherical array. The beam former comprises a harmonic wave conversion module, a beam guide module and a beam pattern synthesis module, wherein the harmonic wave conversion module is used for sampling data received by a sensor array and performing spherical harmonic conversion to obtain harmonic region data; the beam guide module is used for performing weighting and partial summation processing on the harmonic region data and outputting guided harmonic region data; the beam former is characterized in that: the beam pattern synthesis module is a finite impulse response (FIR) filter-based beam pattern synthesis module; and each order of harmonic region data output after wave guidance is transmitted to one FIR filter respectively, and then outputs of the FIR filters are summed to output beam output time domain data. In the method, FIR filtering and summing processing are performed on each order of harmonic region data after guidance, the each order of harmonic region data is transmitted to one FIR filter and outputs of the FIR filters are summed to obtain a time domain beam output signal.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to a mode beamforming method for a spherical array, especially a beamformer and a beamforming method for spherical microphone arrays and spherical hydrophone arrays suitable for broadband acoustic signals. Background technique [0002] Beamforming processing is widely used in the fields of microphone arrays, sonar, radar, and wireless communications. The general array element domain beamforming process is as follows: a spatially distributed sensor array is used to collect data, and then the collected array data is linearly weighted and combined The processing results in a scalar beam output, and the processor is called a beamformer. By designing the weighting coefficients, the response of the array receiving system can be directional, so the beamformer can be used for spatial filtering and improve the signal-to-noise ratio. [0003] In recent years, mode beamforming methods f...

Claims

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Application Information

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IPC IPC(8): H04R3/00
Inventor 鄢社锋马晓川侯朝焕
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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