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Small scale microphone array speech enhancement system and method

A microphone array and voice enhancement technology, which is applied in the anti-noise system and related technical fields, can solve the problems of inconvenience, inconvenient portability, large-scale microphone array, etc., and achieve the effect of good removal and good enhancement effect

Inactive Publication Date: 2007-05-23
北京大学科技开发有限公司
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Problems solved by technology

But in many occasions, this kind of manual adjustment is very inconvenient, such as remote video conferencing, etc.
[0008] 2. The scale of the array
In the past, the size of the microphone array was relatively large (generally more than 50cm), which made it inconvenient to carry and could not be applied on mobile devices

Method used

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  • Small scale microphone array speech enhancement system and method
  • Small scale microphone array speech enhancement system and method
  • Small scale microphone array speech enhancement system and method

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Embodiment Construction

[0043] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings of the present invention.

[0044] The small-scale microphone array speech enhancement system of the present invention is mainly divided into two sub-parts: signal acquisition and signal processing.

[0045] Figure 1 shows a schematic diagram of the system architecture of the signal acquisition part. The signal acquisition part is composed of a microphone array and an AD converter. The noise-containing speech signal is collected by the microphone as an analog signal, converted into a digital signal by an AD converter, and enhanced in a DSP processing chip, and then transmitted to a computer through a USB port for storage.

[0046] 1. The implementation principle and method of the signal acquisition part

[0047] The system uses three omni-directional microphones to collect signals from th...

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Abstract

The invention provides the small-scale microphone array speech enhancement system and method. The system in the invention consists of two-part, signal acquisition and signal processing. Signal acquisition part comprises the microphone array and the AD converter component. Noisy voice signal is collected from the microphone as analog signals, through the AD converter, turning into digital signals, getting signal enhancement in the DSP chip, and then through USB port, transmitting to the computer for preservation. Signal processing part comprises the microphone consistency calibration module, the adaptive noise cancellation module, the SNR (Signal Noise Ratio) estimation module, and acoustic source location adaptive module, etc. The system in the invention can remove the introduced environmental noise in collection process, increase the collected acoustic source SNR, and obtain better acoustic source signal. In most cases the sound source signal is the speech signal, speech intelligibility improves a little after de-noising process.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an anti-noise system and method based on a small microphone array, including the anti-noise system and related technologies. Background technique [0002] With the rapid development of communication technology and digital signal processing technology, people's requirements for multimedia communication are getting higher and higher, and technologies such as car hands-free calling and video conferencing are more and more widely used. In these applications, although the video signal can increase the amount of communication information and make the communication more natural, the communication between people mainly depends on language. If the quality of the sound is not guaranteed, the communication will become meaningless. Therefore, the quality of the audio signal determines the performance of the entire communication system, and whether the voice is clear and...

Claims

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Application Information

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IPC IPC(8): G10L21/02G10L21/0232
Inventor 迟惠生吴玺宏曲天书赵硕
Owner 北京大学科技开发有限公司
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