Audio-reverberation inhibiting device and inhibiting method thereof

Abstract

The invention discloses an audio-reverberation inhibiting device and an inhibiting method thereof. The device includes a reverberation-time blind estimation module, a later-period reverberation power spectrum estimation module, a spectral-subtraction module and a complex-cepstrum-domain filtering module. A reverberation voice estimates a reverberation time through the reverberation-time blind estimation module. The later-period reverberation power spectrum estimation module establishes a reverberation statistical model through the estimated reverberation time and carries out analysis processing on the reverberation voice so that a later-period reverberation power spectrum is obtained. The spectral-subtraction module includes a gain function structure and a spectral-subtraction implementation module and a spectral-subtraction gain function is constructed firstly through use of a reverberation-voice power spectrum and a later-period reverberation power spectrum. Then the spectral-subtraction gain function and the reverberation voice are input into the spectral-subtraction implementation module so that an earlier-period voice is obtained. Finally, the earlier-period voice is input into the complex-cepstrum-domain filtering module so that a reverberation-removed voice is obtained. The audio-reverberation inhibiting device and the inhibiting method thereof is low in calculation complexity, convenient to handle in a real-time manner and capable of inhibiting audio reverberation obviously and improving voice quality efficiently.

Description

technical field [0001] The invention relates to an audio processing technology, in particular to an audio reverberation suppression device and a suppression method thereof. Background technique [0002] Reverberation is an acoustic phenomenon produced by the reflection of sound waves in a room. An appropriate amount of reverberation can make the sound round and pleasant, and it sounds like a sense of space; if the reverberation is insufficient, the sound will be "dry" and sound unnatural; very bad. [0003] In many occasions where sound is collected, especially when the distance between the sound source and the microphone is long, or when the reverberation in the room is strong, the audio signal collected by the microphone often contains a large reverberation sound, which will seriously affect the clarity and reliability of speech. The intelligibility will also affect the performance of subsequent audio processing systems (such as speech recognition systems, etc.). At thi...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the reverberation time is required to be known, but the reverberation time is usually unknown in the actual application environment; (2) it is difficult to accurately estimate the late reverberation in practice, so this method often introduces some artificial Noise, that is: when overestimating, "musical" noise will be generated; when underestimating, more noise will remain

The system divides the microphone speech into multiple signal blocks, and estimates the energy of the reverberation part for each signal block, which will significantly increase the computational complexity and is difficult to process in real time

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