Dereverberation and noise reduction techniques based on acoustic multi-channel equalization (2015)
Abstract / truncated to 115 words
In many hands-free speech communication applications such as teleconferencing or voice-controlled applications, the recorded microphone signals do not only contain the desired speech signal, but also attenuated and delayed copies of the desired speech signal due to reverberation as well as additive background noise. Reverberation and background noise cause a signal degradation which can impair speech intelligibility and decrease the performance for many signal processing techniques. Acoustic multi-channel equalization techniques, which aim at inverting or reshaping the measured or estimated room impulse responses between the speech source and the microphone array, comprise an attractive approach to speech dereverberation since in theory perfect dereverberation can be achieved. However in practice, such techniques suffer from several drawbacks, ... toggle 8 keywordsdereverberation – noise reduction – equalization – sparsity – automatic regularization – condition number – l-curve – l-hypersurface
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