Adaptive microphone array system and its voice signal processing method

A microphone array, voice signal technology, applied in voice analysis, instruments, etc., can solve the problem of reducing the effective voice signal amplitude, and achieve the effect of the best filtering and denoising effect

Active Publication Date: 2006-10-25
北京中星天视科技有限公司
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Problems solved by technology

[0014] In view of this, the main purpose of the present invention is to provide an adaptive microphone array system, which can control the update of adaptive filter coefficients and solve the problem of reducing the effective voice signal amplitude
[0015] In view

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  • Adaptive microphone array system and its voice signal processing method
  • Adaptive microphone array system and its voice signal processing method
  • Adaptive microphone array system and its voice signal processing method

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Embodiment Construction

[0048] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] In the adaptive microphone array system and its speech signal processing method of the present invention, by adding an adaptive filter coefficient update control module in the microphone array system, it is possible to control whether the adaptive filter coefficients are updated or to use when the adaptive filter coefficients are updated. The step size value, thereby avoiding the adaptive first-order differential microphone array system in the prior art, when the noise component contained in the signal from the rear is comparable to or much smaller than the speech component in the signal from the front , appears to reduce the effective speech signal amplitude and introduce speech distortion side effects.

[0050] see image 3 ,...

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Abstract

This invention discloses an self-adaptive mike array system and a method for processing its phone signals, which adds an self-adaptive filter coefficient refresh control module in the mike system to control if the filter should refresh the coefficient or the step-size value when refreshing the coefficient, so that the refreshment of the coefficient is only against the noise so as to avoid the side effect of reducing effective phone signal amplitude while conducting filter coefficient refresh using existing technology when the noise component from the back signals is comparable with or smaller so than the phone component from frontage. This invented system applies a high-order adaptive filter to reduce the noise amplitude to the utmost degree and ensures the best noise-elimination effect no matter what positions the system zero-point directs when multiple noise sources exist.

Description

technical field [0001] The invention relates to speech processing technology, in particular to an adaptive microphone array system and a speech signal processing method thereof. Background technique [0002] In the real life environment, it is full of various noises and echoes. These interferences will seriously affect people's normal communication and communication, and will also reduce the performance of the speech recognition system. One solution is to use a microphone array system. The commonly used first-order differential microphone array system uses beamforming technology, using two non-directional microphones to form two back-to-back cardioid directional microphones. The microphone array can not only overcome the influence of environmental noise and echo on the voice signal, restore clean voice, but also can perform long-distance recording, remove most of the environmental noise while recording, and solve the problem of inconvenient use of head-mounted microphones. ...

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Application Information

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IPC IPC(8): G10L21/02
Inventor 邓昊冯宇红林中松王箫程
Owner 北京中星天视科技有限公司
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