by Steven L. Gay, Jacob Benesty (2000)
The current revolution in electronic switching and transport technologies promises a dramatic increase in the intimacy and satisfaction that users will experience over imminent telecommunications networks. However, unless there is a corresponding improvement in the technologies of the acoustics of telecommunications, this promise will soon prove empty. The sense of presence that people feel when together in a room is largely due to the psycho-acoustic cues they sense from the human binaural hearing system evolved over millennia. Modern acoustic signal processing is just now beginning to be able to deliver that same experience to users remotely located from each other. This includes the ability to communicate in full duplex with wider bandwidths and multiple audio streams (e.g. stereo, 3D audio). It also involves locating and separating audio sources, suppressing noise, and using sound to automatically steer video cameras. Acoustic Signal Processing for Telecommunication presents digital signal processing techniques for telecommunications acoustics that are both cutting-edge and practical. Each chapter presents material that has not appeared in book form before and yet is easily realizable in today's technology. To this end, both new theory and new implementation techniques are presented. Topics include new adaptive filtering algorithms, multi-channel acoustic echo cancellation, noise control, virtual sound, sound source localization for camera tracking, source separation, and microphone arrays.
Janet Abbate
In Inventing the Internet, Janet Abbate focuses on the social and cultural factors that influenced the Internet's design and use. She unfolds an often twisting tale of collaboration and conflict among a remarkable variety of players, including government and military agencies, computer scientists in academia and industry, graduate students, telecommunications companies, standards organizations, and network users.
Kathlyn Gay
Discusses the theories of ancient Greek philosopher-scientists such as Ptolemy, Pythagoras, Hippocrates, and Aristotle, and describes scientific discoveries and their applications in ancient Greece.
Frank Ross, Jr
Discusses the achievements of the ancient Chinese in astronomy, medicine, science, and engineering, as well as such influential Chinese inventions as paper, printing, gun powder, and the compass.
Philip G. Howlett, Peter J. Pudney
Rail is potentially a very efficient form of transport, but must be convenient, reliable and cost-effective to compete with road and air transport. Optimal control can be used to find energy-efficient driving strategies for trains. This book describes the train control problem and shows how a solution was found at the University of South Australia. This research was used to develop the Metromiser system, which provides energy-efficient driving advice on suburban trains. Since then, this work has been modified to find practical driving strategies for long-haul trains. The authors describe the history of the problem, reviewing the basic mathematical analysis and relevant techniques of constrained optimisation. They outline the modelling and solution of the problem and finally explain how the fuel consumption can be minimised for a journey, showing the effect of speed limits and track gradients on the optimal driving strategy.