Method for estimating direction of arrival of directional microphone microarray

Abstract

The invention discloses a method for estimating a direction of arrival of a directional microphone microarray. The method comprises the steps of: (1) constructing the directional microphone microarrayto receive external sound wave analog signals, wherein the directional microphone microarray is composed of two microphones with directivity; (2) preprocessing the received analog signals by means ofthe two microphones with directivity respectively, and converting the analog signals into digital signals by means of an AD module; (3) performing noise reduction and voice enhancement processing onthe digital signals to obtain voice signals with a high signal-to-noise ratio; (4) comparing the acquired signal energy of the two microphones, judging the approximate direction of arrival by adoptingan energy comparison method, and partitioning the direction of arrival; and (5) solving voice time delay by using a generalized cross-correlation method, and calculating a precise direction of arrival by using a time delay estimation method. The method is simple in structure, reliable in performance, low in calculation complexity and suitable for a microphone solution under the condition that thenumber and the size of microphone arrays are greatly limited.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a direction-of-arrival estimation method of a directional microphone microarray. Background technique [0002] With the rapid development of computer technology and the maturity of deep learning technology, voice interaction has become an important interaction method for human-computer interaction. For example, voice assistants such as Siri in mobile phones and other terminals, car voice control, navigation, smart home, industrial automation, military and other fields have many applications. In the voice interaction process, voice signal acquisition is a particularly critical process. Speech signal acquisition involves a series of technologies, including microphone array, analog-to-digital conversion, signal preprocessing and signal storage / transmission, etc. All technologies are interrelated and affect each other, and none of them can be dispensed with. Among them, ...

AI Technical Summary

Problems solved by technology

[0006] Based on the technical problems existing in the background technology, the present invention proposes a method for estimating the direction of arrival of a directional microphone microarray, which solves the problem of the direction of arrival (speech) of the omnidirectional dual-mic microphone microarray in the positive and negative directions of the y-axis. Indistinguishable problems, to achieve accurate estimation of the direction of arrival (speech) in the whole space

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