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Acoustic cloaking method based on MVDR

A technology of hidden sound and sound source, which is applied in the field of hidden sound of the microphone array, which can solve the problems of poor dynamic effect, inability to meet the application of hidden sound, and unsatisfactory promotion of communication earphones, etc., and achieve the effect of good hidden sound effect

Inactive Publication Date: 2017-09-15
临境声学科技江苏有限公司
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Problems solved by technology

Although bone conduction microphone technology has made a breakthrough, the current promotion of its communication earphones is not very ideal. There are several problems: 1) poor dynamic effect; 2) high cost; 3) poor packaging effect; 4) poor sound quality
However, the separation performance achieved by the current separation technology is still very limited, which cannot meet the needs of hidden sound applications.

Method used

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  • Acoustic cloaking method based on MVDR
  • Acoustic cloaking method based on MVDR
  • Acoustic cloaking method based on MVDR

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Embodiment Construction

[0060] The technical solutions of the present invention will be clearly and completely described below through specific embodiments.

[0061] The hidden sound method based on MVDR of the present invention, this method first utilizes short-time Fourier transform, decomposes the time-domain signal that the sensor array receives into subband signal, constructs appropriate hidden sound filter on each subband, makes The acoustic signal from the sound source within the hidden sound distance passes through the hidden sound filter without attenuation, and finally the estimated signal is obtained through inverse STFT.

[0062] Method of the present invention comprises the steps:

[0063] S1: According to the structure of the array, the number of array elements, the position of the sound source and other parameters, construct the steering vector

[0064]

[0065] S2: The signal y received by the sensor in the microphone array m (k)=x m (k)+v m (k), m=1, 2,..., M is divided into s...

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Abstract

The invention discloses a method for concealing sound based on MVDR. The method first uses short-time Fourier transform to decompose the time-domain signal received by the sensor array into frequency-domain sub-band signals, and constructs a sub-band signal based on MVDR on each sub-band. The hidden sound filter, so that the acoustic signal from the sound source within the hidden sound distance passes through the hidden sound filter without attenuation, and finally the estimated signal is obtained through inverse STFT. The invention has better sound hiding effect.

Description

technical field [0001] The invention relates to a sound hiding technology of a microphone array, in particular to an MVDR-based sound hiding method. Background technique [0002] The research on hidden sound technology has a long history. People have mainly explored two methods in the field of acoustic signal sensing: bone conduction microphone and ultrasonic microphone, and explored signal separation technology and differential microphone array in the field of acoustic signal processing. [0003] Bone conduction microphones use the slight vibration of the head and neck bones caused by human speech to collect sound signals and convert them into electrical signals. Because it is different from traditional microphones that pick up sound through air conduction, it can also transmit high-definition sound in a very noisy environment. As early as hundreds of years ago, people had many practical applications of bone conduction technology, but the voice quality of early bone conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L21/0224
CPCG10L21/0216G10L21/0224G10L2021/02166
Inventor 陈景东梁菲菲王雪瀚黄海聂玮奇
Owner 临境声学科技江苏有限公司
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