Empire of the Air

Empire of the Air PDF

Author: Tom Lewis

Publisher: Cornell University Press

Published: 2021-09-15

Total Pages: 446

ISBN-13: 1501759337

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Empire of the Air tells the story of three American visionaries—Lee de Forest, Edwin Howard Armstrong, and David Sarnoff—whose imagination and dreams turned a hobbyist's toy into radio, launching the modern communications age. Tom Lewis weaves the story of these men and their achievements into a richly detailed and moving narrative that spans the first half of the twentieth century, a time when the American romance with science and technology was at its peak. Empire of the Air is a tale of pioneers on the frontier of a new technology, of American entrepreneurial spirit, and of the tragic collision between inventor and corporation.

Democratizing Innovation

Democratizing Innovation PDF

Author: Eric Von Hippel

Publisher: MIT Press

Published: 2006-02-17

Total Pages: 224

ISBN-13: 0262250179

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The process of user-centered innovation: how it can benefit both users and manufacturers and how its emergence will bring changes in business models and in public policy. Innovation is rapidly becoming democratized. Users, aided by improvements in computer and communications technology, increasingly can develop their own new products and services. These innovating users—both individuals and firms—often freely share their innovations with others, creating user-innovation communities and a rich intellectual commons. In Democratizing Innovation, Eric von Hippel looks closely at this emerging system of user-centered innovation. He explains why and when users find it profitable to develop new products and services for themselves, and why it often pays users to reveal their innovations freely for the use of all.The trend toward democratized innovation can be seen in software and information products—most notably in the free and open-source software movement—but also in physical products. Von Hippel's many examples of user innovation in action range from surgical equipment to surfboards to software security features. He shows that product and service development is concentrated among "lead users," who are ahead on marketplace trends and whose innovations are often commercially attractive. Von Hippel argues that manufacturers should redesign their innovation processes and that they should systematically seek out innovations developed by users. He points to businesses—the custom semiconductor industry is one example—that have learned to assist user-innovators by providing them with toolkits for developing new products. User innovation has a positive impact on social welfare, and von Hippel proposes that government policies, including R&D subsidies and tax credits, should be realigned to eliminate biases against it. The goal of a democratized user-centered innovation system, says von Hippel, is well worth striving for. An electronic version of this book is available under a Creative Commons license.

Getting the message through: A Branch History of the U.S. Army Signal Corps

Getting the message through: A Branch History of the U.S. Army Signal Corps PDF

Author: Rebecca Robbins Raines

Publisher: Government Printing Office

Published: 1996

Total Pages: 488

ISBN-13: 9780160872815

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Getting the Message Through, the companion volume to Rebecca Robbins Raines' Signal Corps, traces the evolution of the corps from the appointment of the first signal officer on the eve of the Civil War, through its stages of growth and change, to its service in Operation DESERT SHIELD/DESERT STORM. Raines highlights not only the increasingly specialized nature of warfare and the rise of sophisticated communications technology, but also such diverse missions as weather reporting and military aviation. Information dominance in the form of superior communications is considered to be sine qua non to modern warfare. As Raines ably shows, the Signal Corps--once considered by some Army officers to be of little or no military value--and the communications it provides have become integral to all aspects of military operations on modern digitized battlefields. The volume is an invaluable reference source for anyone interested in the institutional history of the branch.

Something in the Air

Something in the Air PDF

Author: Marc Fisher

Publisher: Random House

Published: 2009-04-02

Total Pages: 402

ISBN-13: 0307547094

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A sweeping, anecdotal account of the great sounds and voices of radio–and how it became a bonding agent for a generation of American youth When television became the next big thing in broadcast entertainment, everyone figured video would kill the radio star–and radio, period. But radio came roaring back with a whole new concept. The war was over, the baby boom was on, the country was in clover, and a bold new beat was giving the syrupy songs of yesteryear a run for their money. Add transistors, 45 rpm records, and a young man named Elvis to the mix, and the result was the perfect storm that rocked, rolled, and reinvented radio. Visionary entrepreneurs like Todd Storz pioneered the Top 40 concept, which united a generation. But it took trendsetting “disc jockeys” like Alan Freed, Murray the K, Wolfman Jack, Cousin Brucie, and their fast-talking, too-cool-for-school counterparts across the land to turn time, temperature, and the same irresistible hit tunes played again and again into the ubiquitous sound track of the fifties and sixties. The Top 40 sound broke through racial barriers, galvanized coming-of-age kids (and scandalized their perplexed parents), and provided the insistent, inescapable backbeat for times that were a-changin’. Along with rock-and-roll music came the attitude that would literally change the “voice” of radio forever, via the likes of raconteur Jean Shepherd, who captivated his loyal following of “Night People”; the inimitable Bob Fass, whose groundbreaking Radio Unnameable inaugurated the anything-goes free-form style that would come to define the alternative frontier of FM; and a small-time Top 40 deejay who would ultimately find national fame as a political talk-show host named Rush Limbaugh. From Hunter Hancock, who pushed beyond the limits of 1950s racial segregation with rhythm and blues and hepcat patter, to Howard Stern, who blew through all the limits with a blue streak of outrageous on-air antics; from the heyday of summer songs that united carefree listeners to the latter days of political talk that divides contentious callers; from the haze of classic rock to the latest craze in hip-hop, Something in the Air chronicles the extraordinary evolution of the unique and timeless medium that captured our hearts and minds, shook up our souls, tuned in–and turned on–our consciousness, and went from being written off to rewriting the rules of pop culture.

Software-Defined Radio for Engineers

Software-Defined Radio for Engineers PDF

Author: Alexander M. Wyglinski

Publisher: Artech House

Published: 2018-04-30

Total Pages: 378

ISBN-13: 1630814598

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Based on the popular Artech House classic, Digital Communication Systems Engineering with Software-Defined Radio, this book provides a practical approach to quickly learning the software-defined radio (SDR) concepts needed for work in the field. This up-to-date volume guides readers on how to quickly prototype wireless designs using SDR for real-world testing and experimentation. This book explores advanced wireless communication techniques such as OFDM, LTE, WLA, and hardware targeting. Readers will gain an understanding of the core concepts behind wireless hardware, such as the radio frequency front-end, analog-to-digital and digital-to-analog converters, as well as various processing technologies. Moreover, this volume includes chapters on timing estimation, matched filtering, frame synchronization message decoding, and source coding. The orthogonal frequency division multiplexing is explained and details about HDL code generation and deployment are provided. The book concludes with coverage of the WLAN toolbox with OFDM beacon reception and the LTE toolbox with downlink reception. Multiple case studies are provided throughout the book. Both MATLAB and Simulink source code are included to assist readers with their projects in the field.