Open AccessTwo‐microphone subband noise reduction scheme with a new noise subtraction parameter for speech quality enhancement
Author(s) -
Aung Thiri Thandar,
Thumchirdchupong Hathaichanok,
Tangsangiumvisai Nisachon,
Nishihara Akinori
Publication year - 2015
Publication title -
iet signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.384
H-Index - 42
ISSN - 1751-9683
DOI - 10.1049/iet-spr.2013.0182
Subject(s) - noise reduction , noise (video) , microphone , computer science , speech recognition , distortion (music) , speech enhancement , noise measurement , gradient noise , acoustics , value noise , attenuation , reduction (mathematics) , noise floor , mathematics , physics , telecommunications , bandwidth (computing) , artificial intelligence , amplifier , sound pressure , optics , geometry , image (mathematics)
An improved subband noise reduction technique is proposed for two‐microphone voice communication systems. The technique aims to enhance the speech quality by utilising a subband structure with different noise reduction schemes for different frequency bands. In the low‐frequency band where dominant cues of speech spectral components are usually located and the noise signals from the two channels are mainly correlated, the spectral subtraction method, together with a new variable noise subtraction parameter, is employed so that the noise attenuation performance and speech distortion are controllable. In the high‐frequency band where less‐dominant frequency information of speech spectrum is located, the modified cross‐spectral subtraction technique is utilised to remove the high‐frequency decorrelated noise spectral components. Extensive comparisons among various noise reduction techniques based on computer simulations demonstrate that the proposed two‐microphone subband noise reduction scheme achieves excellent noise attenuation performance while preserving the speech quality.