By E. Hansler, Gerhard Schmidt
Authors are renowned and hugely famous by way of the "acoustic echo and noise community."Presents an in depth description of sensible easy methods to keep watch over echo and noiseDevelops a statistical idea for optimum keep an eye on parameters and provides functional estimation and approximation tools
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Additional resources for Acoustic Echo and Noise Control: A Practical Approach
Fig. 1 “Bell’s new telephone” (with permission from [ 11). In the very early days of the telephone conducting a phone call meant to have both hands busy; one was occupied to hold the loudspeaker close to the ear and the 1 2 INTRODUCTION other hand to position the microphone in front of the mouth [l] (see Fig. 2). This troublesome way of operation was due to the lack of efficient electroacoustic converters and amplifiers. The inconvenience, however, guaranteed optimal conditions: a high signal-to-(environmental) noise ratio at the microphone input, a perfect coupling between loudspeaker and the ear of the listener, and-last but not least-a high attenuation between the loudspeaker and the microphone.
Special emphasis is put on the fact that subband impulse responses are noncausal. The design of filters and filterbanks used in acoustic echo and noise control systems is the topic of Appendix B. 1 NOTATION Throughout this book the notation will follow the same basic rules. Lowercase letters will be used for scalar quantities in the (discrete) time domain; uppercase letters will denote quantities in the frequency domain. Lowercase boldface letters will indicate column vectors; uppercase boldface letters will describe matrices.
Dark colors represent areas with high energy; light colors mark areas with low energy. 18 FUNDAMENTALS 10000 0 t I -I O0O0 10000 1 'I 4 I 5000 90 80 70. 60 - 0 50 -5000 40. -1 0000 I 0 20 40 Time in milliseconds 30 20 60 - 0 1000 2000 3000 Frequency in Hz 4000 I" 80 10000 70 5000 0 60 -5000 40 50 -1 0000 0 1000 20 40 30 20 Time in milliseconds I L 0 60 / 2000 1000 Frequency in Hz 3000 --I 4000 I 70 60 50 -1000 1 0 20 40 Time in milliseconds ' 4 60 40 30 20'0 1000 2000 3000 4dOO Frequency in Hz Fig.
Acoustic Echo and Noise Control: A Practical Approach by E. Hansler, Gerhard Schmidt