Microphone-array speech-beam forming method as well as speech-signal processing device and system

Abstract

The embodiment of the invention discloses a microphone-array speech-beam forming method, which comprises a digital-signal converting step, a frequency-region signal-obtaining step, a time-delay obtaining step, a time-delay compensating step and a weighted stacking step, wherein time-delay estimation based on phase conversion is adopted particularly in the time-delay obtaining step, thereby a beam-forming signal pointed to a target sound-source spatial position after enhancement processing is obtained. Compared with the prior art, the positioning precision and the directivity of a three-dimensional space are enhanced, the long-distance sound-picking capability in a complicated acoustics environment is greatly enhanced, high-quality voice signals are obtained, and noise and other interferences are reduced. The embodiment of the invention also discloses a speech-signal processing device and a system.

Description

technical field [0001] The present invention relates to the acquisition of indoor / outdoor audio signals in complex acoustic environments, such as the long-distance sound pickup digital microphone array (digital microphone array, DMA) technology under the conditions such as large noise pollution or serious room reverberation (room reverberation), especially relates to a A microphone array voice beamforming method, voice signal processing device and system. Background technique [0002] Since the target sound source may be affected by factors such as background noise (cars, people talking, explosions, etc.) and multipath reflection and reverberation, the signal-to-noise ratio of the signal received by a single microphone is reduced, which seriously deteriorates the quality of voice communication. making it difficult to hear the voice of the speaker of interest. In terms of noise processing, traditional single isolated microphones generally use techniques such as spectral subt...

AI Technical Summary

Problems solved by technology

Unfortunately, these received signals and noise often overlap each other in time and spectrum, especially in indoor speech conditions, the reflection signals of walls and other objects are actually copies of the original signal, and it is extremely difficult to remove these multipath reflections. difficulty

Therefore, it is quite difficult to enhance the sound of interest and effectively suppress background noise, strong directional interference (such as uninteresting sound, etc.) and room reverberation using a traditional single microphone and its corresponding digital signal processing method

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