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Acoustic Echo and Noise Control: A Practical Approach by E. Hansler, Gerhard Schmidt PDF

By E. Hansler, Gerhard Schmidt

Authors are renowned and hugely famous via the "acoustic echo and noise community."Presents a close description of functional easy methods to regulate echo and noiseDevelops a statistical idea for optimum keep watch over parameters and offers sensible estimation and approximation tools

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It was clear from the beginning that modeling a loudspeaker-enclosure-microphone system by an adaptive filter formed a much more demanding task than the modeling of electric systems as used for line echo canceling. Nevertheless, at least laboratory models using adaptive filters were investigated in the 1970s [180]. It took at least two more decades of breathtaking progress in digital technology until commercial applications of adaptive filters for acoustic echo and noise control became feasible.

5 Architecture of a hearing aid. tems. It uses the filterbank outputs and estimates their amplitude modulation depths. If the modulation depth of a subband signal is low, noise is assumed and the band is attenuated. Improved processing capabilities will also allow spectral subtraction techniques (see Chapter 14) in the future. In speech pauses the microphone output is switched off and an electronically generated noise is inserted. Since this is not correlated with the microphone output signals, it is very well suited for identifying the acousticaVmechanica1 feedback loop.

Its size measures about 18 m2 and its volume is about 50 m3. The floor is covered by carpet. There are 34 . FUNDAMENTALS 3640 mm b 460 rnm 3 1 lrayl can. diameter 280 mm. height 3W mm 460 rnm ga 3 3 3 3 V Door. hegnt 2 M a rnm Fig. 74 Floorplan of an office with 300 ms reverberation time. curtains in front of the windows. The ceiling consists of plaster board. All these materials exhibit attenuations that increase with frequency. The walls of the office are acoustically hard. The reverberation time of this office is approximately 300 ms.

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