By E. Hansler, Gerhard Schmidt
Authors are popular and hugely famous via the "acoustic echo and noise community."Presents an in depth description of sensible easy methods to regulate echo and noiseDevelops a statistical concept for optimum regulate parameters and provides sensible estimation and approximation equipment
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Extra info for Acoustic Echo and Noise Control: A Practical Approach
For someone who deals with (adaptive) algorithms, speech certainly belongs to the most difficult signals she or he has to handle. Its properties are far away from the properties of white noise that is popular for designing and analyzing algorithms. As background noise we will discuss noise in a car and noise in an office. ,by Rabiner and Juang ) than backgroundnoise. Therefore, we will be brief on speech and elaborate on background noise. 1 Speech Speech might be characterized by nearly periodic (voiced) segments, by noiselike (unvoiced) segments, and by pauses (silence).
The envelope of a speech signal exhibits a very high dynamics. If a sampling frequency of 8 kHz (telephony) is used, the 15 76 FUNDAMENTALS mean spectral envelope may range over more than 40 dB [ 1261. , for teleconferencing systems), the variations increase even further. Parameters derived from a speech signal may be considered valid only during an interval of about 20 ms [49, 1931. Properties of a speech signal are illustrated in Fig. 1. It shows a 5-second time sequence sampled at 8 kHz (upper diagram), the average power spectral density (center), and the result of a time-frequency analysis (lower diagram).
The problem of acoustic echoes and environmental noise is by no way confined to hands-free telephones. Public announce systems, audio and video conference sys- 4 INTRODUCTION tems, systems to interview a person that stays in a remote location are just a few examples. Suppression of noise additively mixed with a useful signal can be considered as a “standalone” problem. Originally solutions to these problems used analog technology. New digital solutions led to a considerable increase of their functionality.
Acoustic Echo and Noise Control: A Practical Approach by E. Hansler, Gerhard Schmidt