Method for improving far-field sound pickup of microphone array based on keywords

A microphone array and keyword technology, applied in speech analysis, speech recognition, instruments, etc., can solve the problems of limited speech enhancement effect and low input signal amplitude, so as to improve the speech enhancement effect and reduce the loss of speech components Effect

Active Publication Date: 2019-01-11
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0011] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology, and provide a method for improving microphone array far-field sound pickup based on keywords, which can solve the problems caused by unreliable single-frame sound source direction and low input signal amplitude in the microphone array far-field sound pickup algorithm. The effect of speech enhancement is limited. By caching the single-

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  • Method for improving far-field sound pickup of microphone array based on keywords

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Embodiment

[0042] When the present invention is not used, the sound pickup process in the monitoring state: echo cancellation, noise suppression, reverberation elimination, automatic gain control, etc., and the sound pickup process in the wake-up state: sound source positioning, beam forming, noise suppression, reverberation elimination, automatic gain control, etc.

[0043] When the present invention is adopted, the sound pickup process in the monitoring state: echo cancellation, noise suppression, reverberation cancellation, single-frame sound source direction calculation and buffering, signal envelope calculation and buffering, automatic gain control, etc.

[0044] When the keyword recognition engine recognizes the target keyword, it uses the fuzzy C-means clustering algorithm to obtain the direction of the sound source, calculates the signal amplitude gain in the wake-up state, and then switches to the wake-up state; in the wake-up state, after gaining the input signal , beamforming ...

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Abstract

The invention discloses a method for improving far-field sound pickup of a microphone array based on keywords, including the steps: after the keywords are detected by a keyword recognition engine, performing clustering operation on the cached single-frame sound source orientation to obtain the sound source orientation with high reliability, and then calculating the input signal gain of the far-field sound pickup algorithm by using the signal envelope maximum value, and switching the device to the wake-up state, wherein in a wake-up state, the algorithm includes input signal gain adjustment, beam forming, noise suppression, reverberation elimination, AGC, etc, At this time, the AGC can set a small adjustment range to avoid amplifying the low-amplitude signal as background noise, so that when the target keyword is detected, the sound source direction and the amplitude gain of the input signal in the wake-up state can be determined according to the keyword, thereby improving the speech enhancement effect of the far-field sound pick-up of the microphone array.

Description

technical field [0001] The invention relates to the technical field of speech recognition, in particular to a method for improving far-field sound pickup by a microphone array based on keywords. Background technique [0002] In recent years, artificial intelligence has shown explosive growth. Voice interaction is an important field of artificial intelligence, and far-field voice-friendly human-computer interaction has gradually become the dominant way of voice interaction, such as smart speakers, car voice, etc.; microphone array and far-field The high-quality voice signal provided by the voice pickup algorithm for voice interaction is the premise of voice interaction. [0003] The current mainstream far-field pickup method is: the device works in the monitoring state most of the time, and when the keyword recognition engine detects keywords, the device enters the wake-up state; in the wake-up state, the input voice is recognized as various interactive commands; After the i...

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Application Information

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IPC IPC(8): G10L21/0216G10L21/0208G10L21/0316G10L15/08
CPCG10L15/08G10L21/0208G10L21/0216G10L21/0316G10L2021/02082G10L2021/02166
Inventor 董天旭
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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