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Digital audio broadcasting. --- Broadcasting, Digital audio --- DAB (Broadcasting) --- Digital radio transmission --- Digital communications

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Multimedia communications --- Digital audio broadcasting --- Mobile communication systems --- Réseaux multimédias --- Radio numérique --- Radiocommunications mobiles --- Periodicals. --- Périodiques --- Digital audio broadcasting. --- Mobile communication systems. --- Multimedia communications. --- multimedia broadcasting --- multimedia streaming --- Multimedia networks --- Multimedia telecommunications --- Multimedia systems --- Telecommunication systems --- Vehicles --- Vehicular communication systems --- Radio --- Wireless communication systems --- Broadcasting, Digital audio --- DAB (Broadcasting) --- Digital radio transmission --- Digital communications --- Communication systems --- Telecommunications --- Telecommunication services

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Over seventy-five million Americans listen to podcasts every month, and the average weekly listener spends over six hours tuning into podcasts from the more than thirty million podcast episodes currently available. Yet despite the excitement over podcasting, the sounds of podcasting's nascent history are vulnerable and they remain mystifyingly difficult to research and preserve. Podcast feeds end abruptly, cease to be maintained, or become housed in proprietary databases, which are difficult to search with any rigor. Podcasts might seem to be highly available everywhere, but it's necessary to preserve and analyze these resources now, or scholars will find themselves writing, researching, and thinking about a past they can't fully see or hear. This collection gathers the expertise of leading and emerging scholars in podcasting and digital audio in order to take stock of podcasting's recent history and imagine future directions for the format. Essays trace some of the less amplified histories of the format and offer discussions of some of the hurdles podcasting faces nearly twenty years into its existence. Using their experiences building and using the PodcastRE database--one of the largest publicly accessible databases for searching and researching podcasts--the volume editors and contributors reflect on how they, as media historians and cultural researchers, can best preserve podcasting's booming audio cultures and the countless voices and perspectives podcasting adds to our collective soundscape.

Podcasting. --- Digital audio broadcasting. --- Podcasting --- Podcasts --- History. --- Archival resources. --- Conservation and restoration. --- Social media --- Sound recordings --- Video recordings --- Webcasting --- Broadcasting, Digital audio --- DAB (Broadcasting) --- Digital radio transmission --- Digital communications --- podcast preservation; podcasts; sound; historiography --- Preservation.

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The “digital revolution” of the last two decades has pervaded innumerable aspects of our daily lives and changed our planet irreversibly. The shift from analog to digital broadcasting has facilitated a seemingly infinite variety of new applications—audience interactivity being but one example. The greater efficiency and compression of digital media have endowed broadcasters with a “digital dividend” of spare transmission capacity over and above the requirements of terrestrial broadcasting. The question is, who will use it, and how? Comparing the European experience with that of broadcasters elsewhere in the world, the author sketches the current status of international frequency management, quantifies the value of the “dividend” itself, analyzes the details of the analog-to-digital switchovers already completed, and posits what the future holds for the sector. As we grapple with new devices, inconceivable a mere generation ago, that allow us to access digital media instantly, anywhere and at any time of day, this book is a potent reminder that what we have witnessed so far may be just the first wavering steps along a road whose destination we can only guess at.

Digital audio broadcasting. --- Radio broadcasting. --- Broadcasting --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Telecommunications --- Radio --- Radio industry and trade --- Broadcasting, Digital audio --- DAB (Broadcasting) --- Digital radio transmission --- Engineering. --- Management. --- Industrial management. --- Image processing. --- Electrical engineering. --- Communications Engineering, Networks. --- Signal, Image and Speech Processing. --- Innovation/Technology Management. --- Image Processing and Computer Vision. --- Freedom of information --- Government publicity --- Mass media --- Digital communications

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High resolution analog-to-digital conversion and digital-to-analog conversion is often realized with the use of a Sigma-Delta Modulator (SDM). The sigma-delta modulation process, although very non-linear when a 1-bit quantizer is used, is nowadays well understood and can be made to deliver a very high signal conversion quality. An example system that pushes the traditional sigma-delta modulation algorithm to its performance limit is the Super Audio CD (SA-CD) standard, in which a 64 times oversampled 1-bit signal is used to represent audio content with an SNR of up to 120~dB over 20~kHz bandwidth.  Look-Ahead Based Sigma-Delta Modulation presents a number of alternative digital sigma-delta modulation techniques that make use of look-ahead, a process that takes into account the effect of decisions on the future, to realize an even higher conversion quality than possible with traditional sigma-delta modulation. This book provides the reader with a clear overview of various encoding techniques and demonstrates the improvements in signal conversion quality that can be obtained from their use. Starting from the basic full look-ahead approach that requires several orders of magnitude more computational power than a normal SDM, more efficient structures are derived that are able to realize a far higher signal conversion performance at a fraction of the computational cost. In addition to this, a modulator is derived that is able to generate bitstreams that are optimized for SA-CD usage, i.e. a high signal conversion quality combined with minimal signal entropy. All the look-ahead algorithms presented in this book are described in pseudocode and ample simulation results are provided to judge the effects on the signal conversion performance.

Analog-to-digital converters. --- Digital audio broadcasting. --- Electronics. --- Modulators (Electronics). --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Digital-to-analog converters. --- Modulators (Electronics) --- Converters, Digital-to-analog --- Analog-digital converters --- Engineering. --- Computer organization. --- Electronic circuits. --- Circuits and Systems. --- Computer Systems Organization and Communication Networks. --- Modulation (Electronics) --- Pulse circuits --- Radio --- Digital electronics --- Hybrid computers --- Analog electronic systems --- Computer input-output equipment --- Electronic data processing --- Transmitters and transmission --- Systems engineering. --- Computer network architectures. --- Architectures, Computer network --- Network architectures, Computer --- Computer architecture --- Engineering systems --- System engineering --- Engineering --- Industrial engineering --- System analysis --- Design and construction --- Organization, Computer --- Electronic digital computers --- Electron-tube circuits --- Electric circuits --- Electron tubes --- Electronics