Multi-Microphone Speech Enhancement - =1=Using LCMV ...

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Introduction Overview of Spatial Noise Reduction Techniques 1 Fixed beamforming Combine the microphone signals using a time-invariant filter-and-sum operation (data-independent). Jan, Flanagan, 1996; Doclo, Moonen, 2003; Schäfer, Heese, Wernerus, Vary, 2012 2 Adaptive Beamforming Combine the spatial focusing of fixed beamformers with adaptive suppression of (spectrally and spatially time-varying) background noise. General reading: Cox et al., 1987; Van Veen, Buckley, 1988; Van Trees, 2002 3 Blind Source Separation (BSS) Considers the received signals at the microphones as a mixture of all sound sources filtered by the RIRs. Utilizes Independent Component Analysis (ICA) techniques. Makino, 2003 4 Computational Auditory Scene Analysis (CASA) Aims at performing sound segregation by modelling the human auditory perceptual processing. Brown, Wang, 2005 Back S. Gannot (BIU) Multi-Microphone Speech Enhancement IWAENC 2012 34 / 53
The Transfer Function GSC RTF Estimation Relative Transfer Function Estimation System Perspective: z m = ˜h mz d 1 + u m System Identification: ˆΦ zmz1 = ˜h m d ˆΦ z1 z 1 + Φ umz1 + ε m Estimation is Biased: u m and z 1 are correlated ⇒ Biased estimator for ˜h d m S. Gannot (BIU) Multi-Microphone Speech Enhancement IWAENC 2012 35 / 53
Page 1 and 2: Multi-Microphone Speech Enhancement
Page 3 and 4: Introduction Room Acoustics Essenti
Page 5 and 6: Problem Formulation Problem Formula
Page 7 and 8: Problem Formulation Problem Formula
Page 9 and 10: LCMV Beamformer Criterion and Solut
Page 11 and 12: LCMV Beamformer The GSC Implementat
Page 13 and 14: MVDR Criterion, Solution, GSC The M
Page 15 and 16: The Transfer Function GSC Relative
Page 17 and 18: The Transfer Function GSC RTF Estim
Page 19 and 20: The Constraints Set Multi-Constrain
Page 21 and 22: Single Desired Speaker Directional
Page 23 and 24: Binaural LCMV Binaural LCMV Beamfor
Page 25 and 26: Double LCMV Criterion Binaural LCMV
Page 27 and 28: Binaural LCMV ISR vs. ITF ISR vs. I
Page 29 and 30: Binaural LCMV Experimental Study So
Page 31 and 32: Binaural LCMV Experimental Study IL
Page 33: Vielen dank ! Acoustic Lab S. Ganno
Page 37 and 38: CTF vs. MTF Motivation The Convolut
Page 39 and 40: CTF vs. MTF Simulation Results Expe
Page 41 and 42: CTF vs. MTF Known RTF, Input SNR=0d
Page 43 and 44: Summary CTF vs. MTF Simulation Resu
Page 45 and 46: Multi-Constraint GSC Interferences
Page 47 and 48: Multi-Constraint GSC Parameter Esti
Page 49 and 50: Multi-Constraint GSC Parameter Esti
Page 51 and 52: QRD Pruning Graphical Interpretatio
Page 53: Setup Binaural LCMV Experimental St

Multi-Microphone Speech Enhancement - =1=Using LCMV ...

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