Microphone array voice enhancement device with sound source direction tracking function and method thereof

Abstract

The invention provides a microphone array voice enhancement device with a sound source direction tracking function and a method for the microphone array voice enhancement device. The microphone array voice enhancement device relates to voice signal processing. A microphone array, an adjustable parallel beam former group module, a fixed parameter FIR (Finite Impulse Response) filter module, a fixed parameter signal blocking module, an adaptive noise canceller module and a sound source direction update module are aranged in the devide. The method comprises the following steps of: initializing, forming an adjustable beam, fixing parameter filtering, blocking a signal, carrying out adaptive noise cancelling, and updating a sound source direction. The invention provides an adjustable parallel beam former group combined with a sidelobe canceller structure to achieve real-time tracking of a target sound source direction, embeds the sound source direction tracking function directly to a generalized sidelobe canceller structure, can achieve sound source direction tracking and voice enhancement, thereby overcoming sensibility of an algorithm performance on a DOA (Direction of Arrival) estimation error.

Description

technical field [0001] The invention relates to a voice signal processing, in particular to a microphone array voice enhancement device with sound source direction tracking function and its method. Background technique [0002] The research and application based on microphone array is a new field of speech signal processing. In the field of speech signal processing such as speech recognition, speech control, and speech synthesis, the speech signal received by the microphone is greatly affected by environmental noise and interference, which seriously affects the processing quality of the speech signal. The general speech enhancement system based on a single microphone is difficult Get a better enhancement effect. Since the microphone array utilizes the spatial information of the target signal, noise and interference, the speech enhancement system based on the microphone array can provide better enhancement effect. [0003] Array microphones can form multiple microphones int...

AI Technical Summary

Problems solved by technology

However, according to the traditional generalized sidelobe canceller algorithm structure, the sound source localization calculation needs to be performed first, and then the GSC microphone array speech enhancement processing is performed according to the obtained target sound source azimuth, which will cause the expected sound source azimuth aligned by the GSC to be different from the actual sound source. There is a lag between the source bearings, which affects the speech enhancement effect

[0008] At the same time, since the classic generalized sidelobe canceller needs to obtain the target sound source direction as the precondition for the algorithm to run, when there is a certain error between the target sound source direction and the actual sound source direction, the sound source direction (DOA, Direction of arrival) mismatch will be It affects the blocking effect of the blocking matrix on the desired signal in the direction of the sound source, that is, part of the signal of the non-adaptive branch leaks to the input of the noise canceller of the adaptive branch, causing the speech signal to be weakened, thus affecting the effect of speech enhancement

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