Acoustic Signal Processing for Telecommunication

✍ Scribed by Steven L. Gay, Jacob Benesty (auth.), Steven L. Gay, Jacob Benesty (eds.)

• Publisher: Springer US
• Year: 2000
• Tongue: English
• Leaves: 337
• Series: The Springer International Series in Engineering and Computer Science 551
• Edition: 1
• Category: Library

✦ Synopsis

158 2. Wiener Filtering 159 3. Speech Enhancement by Short-Time Spectral Modification 3. 1 Short-Time Fourier Analysis and Synthesis 159 160 3. 2 Short-Time Wiener Filter 161 3. 3 Power Subtraction 3. 4 Magnitude Subtraction 162 3. 5 Parametric Wiener Filtering 163 164 3. 6 Review and Discussion Averaging Techniques for Envelope Estimation 169 4. 169 4. 1 Moving Average 170 4. 2 Single-Pole Recursion 170 4. 3 Two-Sided Single-Pole Recursion 4. 4 Nonlinear Data Processing 171 5. Example Implementation 172 5. 1 Subband Filter Bank Architecture 172 173 5. 2 A-Posteriori-SNR Voice Activity Detector 5. 3 Example 175 6. Conclusion 175 Part IV Microphone Arrays 10 Superdirectional Microphone Arrays 181 Gary W. Elko 1. Introduction 181 2. Differential Microphone Arrays 182 3. Array Directional Gain 192 4. Optimal Arrays for Spherically Isotropic Fields 193 4. 1 Maximum Gain for Omnidirectional Microphones 193 4. 2 Maximum Directivity Index for Differential Microphones 195 4. 3 Maximimum Front-to-Back Ratio 197 4. 4 Minimum Peak Directional Response 200 4. 5 Beamwidth 201 5. Design Examples 201 5. 1 First-Order Designs 202 5. 2 Second-Order Designs 207 5. 3 Third-Order Designs 216 5. 4 Higher-Order designs 221 6. Optimal Arrays for Cylindrically Isotropic Fields 222 6. 1 Maximum Gain for Omnidirectional Microphones 222 6. 2 Optimal Weights for Maximum Directional Gain 224 6. 3 Solution for Optimal Weights for Maximum Front-to-Back Ratio for Cylindrical Noise 225 7. Sensitivity to Microphone Mismatch and Noise 230 8.

✦ Table of Contents

Front Matter....Pages i-xxii
An Introduction to Acoustic Echo and Noise Control....Pages 1-19
Front Matter....Pages 21-21
The Fast Affine Projection Algorithm....Pages 23-45
Subband Acoustic Echo Cancellation Using the FAP-RLS Algorithm: Fixedpoint Implementation Issues....Pages 47-65
Real-Time Implementation of the Exact Block NLMS Algorithm for Acoustic Echo Control in Hands-Free Telephone Systems....Pages 67-80
Double-Talk Detection Schemes for Acoustic Echo Cancellation....Pages 81-97
Front Matter....Pages 99-99
Multi-Channel Sound, Acoustic Echo Cancellation, and Multi-Channel Time-Domain Adaptive Filtering....Pages 101-120
Multi-Channel Frequency-Domain Adaptive Filtering....Pages 121-133
A Real-Time Stereophonic Acoustic Subband Echo Canceler....Pages 135-152
Front Matter....Pages 153-153
Subband Noise Reduction Methods for Speech Enhancement....Pages 155-178
Front Matter....Pages 179-179
Superdirectional Microphone Arrays....Pages 181-237
Microphone Arrays for Video Camera Steering....Pages 239-259
Nonlinear, Model-Based Microphone Array Speech Enhancement....Pages 261-279
Front Matter....Pages 281-281
3D Audio and Virtual Acoustical Environment Synthesis....Pages 283-301
Virtual Sound Using Loudspeakers: Robust Acoustic Crosstalk Cancellation....Pages 303-317
Front Matter....Pages 319-319
An Introduction to Blind Source Separation of Speech Signals....Pages 321-329
Back Matter....Pages 331-333

✦ Subjects

Signal, Image and Speech Processing; Electrical Engineering