Signal processing method and device, and terminal

Abstract

The present invention provides a signal processing method and device and a terminal, and relates to the field of audio technology. The method and device can compensate for the low-frequency loss of anobtained cardioid directivity signal in a process of generating the surround sound, and improve the signal-to-noise ratio of the cardioid directivity signal in a low-frequency band, The method in specific solution includes: acquiring the signals of a first microphone, a second microphone, a third microphone, and a fourth microphone in a microphone array; performing a differential process on the signals of respective microphones to obtain a first initial directivity signal, a second initial directivity signal, a third initial directivity signal and a fourth initial directivity signal; based ona Wiener filtering method, performing low-frequency compensation on respective initial directivity signals to obtain a first directivity signal, a second directivity signal, a third directivity signal, and a fourth directivity signal; according to respective directivity signals, obtaining a first sound field component, a second sound field component, a third sound field component, and a fourth sound field component.

Description

technical field [0001] Embodiments of the present invention relate to the field of audio technology, and in particular, to a signal processing method, device, and terminal. Background technique [0002] With the development of 4G technology and 5G technology, the rapid increase of broadband (Broad band), surround sound recording and playback technology is more and more applied in current mobile terminals. Wherein, the sound field of the surround sound may be a three-dimensional sound field. [0003] Currently, four directional microphones can be used to collect cardioid directional signals in four different directions (referred to as directional signals for short), so as to generate sound field components W, X, Y, and Z of a three-dimensional sound field. Wherein, the above-mentioned sound field components W, X, Y and Z are signals in B-format format. Subsequently, the above-mentioned sound field components W, X, Y and Z can be decoded to obtain speaker excitation signals ...

AI Technical Summary

Problems solved by technology

The existing problem is that although the low-frequency loss of the four directional signals after differential processing is compensated by the above-mentioned low-pass filter, the noise floor of the four directional signals is raised at the same time, so that the four directional signals Low signal-to-noise ratio at low frequencies

Thereby, the quality of the loudspeaker excitation signal obtained according to these 4 directional signals needs to be improved

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