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The book reflects the state of the art in important areas of speech and audio signal processing. It presents topics which are missed so far and most recent findings in the field. Leading international experts report on their field of work and their new results. Considerable amount of space is covered by multi-microphone systems, specific approaches for noise reduction, and evaluations of speech signals and speech processing systems. Multi-microphone systems include automatic calibration of microphones, localisation of sound sources, and source separation procedures. Also covered are recent approaches to the problem of adaptive echo and noise suppression. A novel solution allows the design of filter banks exhibiting bands spaced according to the Bark scale und especially short delay times. Furthermore, a method for engine noise reduction and proposals for improving the signal/noise ratio based on partial signal reconstruction or using a noise reference are reported. A number of contributions deal with speech quality. Besides basic considerations for quality evaluation specific methods for bandwidth extension of telephone speech are described. Procedures to reduce the reverberation of audio signals can help to increase speech intelligibility and speech recognition rates. In addition, solutions for specific applications in speech and audio signal processing are reported including, e.g., the enhancement of audio signal reproduction in automobiles and the automatic evaluation of hands-free systems and hearing aids.

Signal processing. --- Acoustical engineering. --- Noise control. --- Echo suppression (Telecommunication) --- Noise prevention --- Acoustical engineering --- Environmental engineering --- Noise --- Acoustic engineering --- Sonic engineering --- Sonics --- Sound engineering --- Sound-waves --- Engineering --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Echo cancellation (Telecommunication) --- Echo control (Telecommunication) --- Suppression, Echo (Telecommunication) --- Telecommunication --- Radio noise --- Signal processing --- Telecommunication systems --- Industrial applications --- Echo suppression --- Acoustics. --- Signal, Image and Speech Processing. --- Image processing. --- Speech processing systems. --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing

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Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression.

Ambient intelligence. --- Automatic data collection systems -- Standards. --- Echo cancellation. --- Stereophony. --- Echo suppression (Telecommunication) --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Applied Physics --- Telecommunications --- Acoustical engineering. --- Acoustic engineering --- Sonic engineering --- Sonics --- Sound engineering --- Sound-waves --- Echo cancellation (Telecommunication) --- Echo control (Telecommunication) --- Suppression, Echo (Telecommunication) --- Telecommunication --- Industrial applications --- Echo suppression --- Engineering. --- User interfaces (Computer systems). --- Fourier analysis. --- Signal, Image and Speech Processing. --- User Interfaces and Human Computer Interaction. --- Fourier Analysis. --- Engineering --- Radio noise --- Signal processing --- Telecommunication systems --- Computer science. --- Analysis, Fourier --- Mathematical analysis --- Informatics --- Science --- Signal processing. --- Image processing. --- Speech processing systems. --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing

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Speech dereverberation is a signal processing technique of key importance for successful hands-free speech acquisition in applications of telecommunications and automatic speech recognition. Over the last few years, speech dereverberation has become a hot research topic driven by consumer demand, the availability of terminals based on Skype™ which encourage hands-free operation and the development of promising signal processing algorithms. Speech Dereverberation gathers together an overview, a mathematical formulation of the problem and the state-of-the-art solutions for dereverberation. Speech Dereverberation presents the most important current approaches to the problem of reverberation. It begins by providing a focused and digestible review of the relevant topics in room acoustics and also describes key performance measures for dereverberation. The algorithms are then explained together with relevant mathematical analysis and supporting examples that enable the reader to see the relative strengths and weaknesses of the various techniques, as well as giving a clear understanding of the open questions still to be addressed in this topic. Techniques rooted in speech enhancement are included, in addition to a substantial treatment of multichannel blind acoustic system identification and inversion. The TRINICON framework is shown in the context of dereverberation to be a powerful generalization of the signal processing for a important range of analysis and enhancement techniques. Speech Dereverberation offers the reader an overview of the subject area, as well as an in-depth text on the advanced signal processing involved. The book benefits the reader by providing such a wealth of information in one place, defines the current state of the art and, lastly, encourages further work on this topic by offering open research questions to exercise the curiosity of the reader. It is suitable for students at masters and doctoral level, as well as established researchers.

Acoustical engineering. --- Echo suppression (Telecommunication). --- Electronic data processing -- Distributed processing. --- Noise control. --- Signal processing -- Mathematics. --- Signal processing. --- Speech processing systems --- Echo suppression (Telecommunication) --- Sound --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Applied Physics --- Electrical Engineering --- Telecommunications --- Reverberation --- Prevention --- Speech processing systems. --- Prevention. --- Acoustics --- Echo cancellation (Telecommunication) --- Echo control (Telecommunication) --- Suppression, Echo (Telecommunication) --- Telecommunication --- Echo suppression --- Engineering. --- Data structures (Computer science). --- Artificial intelligence. --- Computational intelligence. --- Signal, Image and Speech Processing. --- Artificial Intelligence (incl. Robotics). --- Data Structures, Cryptology and Information Theory. --- Computational Intelligence. --- Intelligence, Computational --- Artificial intelligence --- Soft computing --- AI (Artificial intelligence) --- Artificial thinking --- Electronic brains --- Intellectronics --- Intelligence, Artificial --- Intelligent machines --- Machine intelligence --- Thinking, Artificial --- Bionics --- Cognitive science --- Digital computer simulation --- Electronic data processing --- Logic machines --- Machine theory --- Self-organizing systems --- Simulation methods --- Fifth generation computers --- Neural computers --- Information structures (Computer science) --- Structures, Data (Computer science) --- Structures, Information (Computer science) --- File organization (Computer science) --- Abstract data types (Computer science) --- Construction --- Industrial arts --- Technology --- Continuum mechanics --- Mathematical physics --- Physics --- Pneumatics --- Radiation --- Wave-motion, Theory of --- Radio noise --- Signal processing --- Telecommunication systems --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Singing voice synthesizers --- Data structures (Computer scienc. --- Artificial Intelligence. --- Data Structures and Information Theory. --- Image processing. --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication)