Dual-channel voice enhancement method and device

Abstract

The invention discloses a dual-channel voice enhancement method and device, wherein the method comprises the following steps: inputting a first sound signal received from a first microphone and a second sound signal received from a second microphone into a delay addition beam former to obtain N paths of beams; determining a beam corresponding to the direction of the sound to be enhanced as a target beam, wherein the target beam is one of the N paths of the beams; calculating according to N paths of the beams to obtain the existence probability of the sound to be enhanced in the target beam; the target beam is enhanced based on the probability of presence. By generating the N paths of beams based on the received dual-channel sound signal and determining the presence of desired speech at thetarget beam based on the target beam and other beam joint calculations with the target beam being identified, interference from other directional speech is avoided, and a higher signal-to-noise ratiois obtained.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to a dual-channel speech enhancement method and device. Background technique [0002] In reverberant and noisy environments, multi-channel systems are usually used to obtain high-quality voice communication. Compared with single-channel systems, the spatial filtering capabilities of multi-channel can suppress interfering signals from undesired directions, so significant performance improvements can be obtained , and the greater the number of channels, the stronger the interference suppression ability. However, in the case of spatially incoherent noise fields, beamforming alone cannot provide sufficient noise reduction, and post-filtering needs to be introduced. [0003] The currently proposed post-filtering technology includes single-channel post-filtering. The single-channel post-filtering algorithm can better eliminate steady-state noise and is relatively stable w...

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Problems solved by technology

[0005] However, when this method is used in dual-channel speech enhancement, there will be a big problem, because the spatial filtering capability of the dual-channel is very limited, and the estimation of the blocking matrix will often have a large deviation, resulting in more noise in the reference channel. If the voice is expected to leak in, there will be a large error in the estimation of TBRR, which will lead to a serious self-elimination problem, which will seriously distort the voice, which is not conducive to subsequent interactive functions such as recognition.

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