A Reduced-Order Frequency Invariant Robust Super Directional Beamforming Algorithm

A super-pointing and beam-based technology, applied in direction finders using electromagnetic waves, etc., can solve problems such as changes, filter white noise gain, directivity factor spatial response cannot be controlled independently, and is not suitable for extracting broadband signals, etc., to achieve good results Effects of Frequency Consistency and White Noise Gain Improvement

Active Publication Date: 2018-05-08
临境声学科技江苏有限公司
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Problems solved by technology

However, the problem with this type of algorithm is that the spatial response of the array varies with the frequency, which is not suitable for extracting broadband signals from complex environments; to control the white noise gain of the final filter
However, the filter's white noise gain, directivity factor, and spatial response cannot be independently controlled

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  • A Reduced-Order Frequency Invariant Robust Super Directional Beamforming Algorithm
  • A Reduced-Order Frequency Invariant Robust Super Directional Beamforming Algorithm
  • A Reduced-Order Frequency Invariant Robust Super Directional Beamforming Algorithm

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Embodiment

[0121] Such as figure 1 As shown, wherein M=10, δ=2cm, M′=4, γ=2, design a super-directional beamforming with a 12dB directivity factor with an M=10 array element microphone array with an array element spacing of δ=2cm filter. Therefore, the required M' satisfies,

[0122] 10logM' 2 =12

[0123] It is not difficult to find that the corresponding M' is equal to 4.

[0124] (a.1), (a.2) and (a.3) are the beam patterns of h′(ω), h″(ω), and h(ω). For the convenience of comparison, the traditional super-pointing The directivity factor and white noise gain of the array, the reduced-order superdirectional array maximizing the white noise gain criterion, and the superdirectional array under the white noise gain constraint are plotted in (b.1) and (b.2). The traditional The beam pattern of the super-directional array is the same as that of h′(ω), the reduced-order super-directional array that maximizes the white noise gain criterion and the beam pattern of the super-directional ar...

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Abstract

The invention provides a reduced-order constant-frequency robust super-directivity wave beam formation algorithm, and the algorithm mainly comprises the steps: the building of a frequency domain signal model; the designing of a wave beam pattern forming algorithm; the designing of a directional factor forming algorithm and the designing of a white noise gain algorithm. The algorithm also comprises the step: the forming of a super-directivity wave beam formation filter which is formed by the convolution of a first sub-filter and a second sub-filter. The first sub-filter is used for designing a low-order super-directivity wave beam pattern, and the second sub-filter is used for improving the white noise gain. The algorithm is improved on the basis of the prior art, can achieve the constant-frequency airspace response, and also can control the constant-frequency features of the directional factor and airspace response.

Description

Technical field: [0001] The invention relates to the field of sound source signals, in particular to a reduced-order, frequency-invariant, robust super-directional beamforming algorithm. Background technique: [0002] Microphone arrays combined with beamforming techniques are often used to extract sound source signals of interest from noisy observation signals. The basic idea of ​​beamforming technology is to form a filter in the spatial domain, and then point the direction with the largest filter response to the direction of the desired sound source, while attenuating noise and interference from other directions. Since the voice signal is broadband, in order to avoid distortion of the voice signal and background noise, it is usually hoped that the spatial domain response of the microphone array does not vary with frequency during design. Among all the beamforming algorithms, super-directional beamforming has been a widely concerned beamforming algorithm. The reason is tha...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/78
CPCG01S3/78
Inventor 陈景东潘超
Owner 临境声学科技江苏有限公司
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