Tag Archives: broadband

Study and Design of Differential Microphone Arrays

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Jacob Benesty, Jingdong Chen, "Study and Design of Differential Microphone Arrays"
English | 2013 | ISBN-10: 364233752X, 3642427561 | 180 pages | PDF | 6 MB

Study and Design of Differential Microphone Arrays
Microphone arrays have attracted a lot of interest over the last few decades since they have the potential to solve many important problems such as noise reduction/speech enhancement, source separation, dereverberation, spatial sound recording, and source localization/tracking, to name a few. However, the design and implementation of microphone arrays with beamforming algorithms is not a trivial task when it comes to processing broadband signals such as speech. Indeed, in most sensor arrangements, the beamformer output tends to have a frequency-dependent response. One exception, perhaps, is the family of differential microphone arrays (DMAs) who have the promise to form frequency-independent responses. Moreover, they have the potential to attain high directional gains with small and compact apertures. As a result, this type of microphone arrays has drawn much research and development attention recently. This book is intended to provide a systematic study of DMAs from a signal processing perspective. The primary objective is to develop a rigorous but yet simple theory

for the design, implementation, and performance analysis of DMAs. The theory includes some signal processing techniques for the design of commonly used first-order, second-order, third-order, and also the general Nth-order DMAs. For each order, particular examples are given on how to form standard directional patterns such as the dipole, cardioid, supercardioid, hypercardioid, subcardioid, and quadrupole. The study demonstrates the performance of the different order DMAs in terms of beampattern, directivity factor, white noise gain, and gain for point sources. The inherent relationship between differential processing and adaptive beamforming is discussed, which provides a better understanding of DMAs and why they can achieve high directional gain. Finally, we show how to design DMAs that can be robust against white noise amplification.
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Optimization and Performance Analysis of High Speed Mobile Access Networks

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Optimization and Performance Analysis of High Speed Mobile Access Networks
Publisher: Vieweg+Teubner Verlag | ISBN: 3834817090 | 2012 | PDF | 263 pages | 5.6 MB

Optimization and Performance Analysis of High Speed Mobile Access Networks
The design and development of cost-effective mobile broadband wireless access networks is a key challenge for many mobile network operators. The over-dimensioning or under-dimensioning of an access network results in both additional costs and customer dissatisfaction. A Thushara Weerawardane introduces new transport technologies and features for High Speed Packet Access HSPA and Long-Term Evolution LTE networks.
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Networking For Dummies (3rd edition) [Repost]

Doug Lowe – Networking For Dummies (3rd edition)
Published: 2007-05-29 | ISBN: 0470056207 | CHM + PDF | 432 pages | 33 MB

Company just hooked you up to a network and you’re wondering what the heck you’re supposed to do with it? Tired of burning spreadsheets onto CDs just so you can share them with coworkers, and you’re wondering what it’ll take to set up a network in your organization? Been tasked with setting up a network and you don’t have a clue about where to begin? Don’t fret, you’ll find all the answers you’re looking for in Networking for Dummies.
Written for even the most network-shy novice, it begins with the most basic of basics—“A network is nothing more than two or more computers connected by a cable (or wireless adapter) so that they can share information”—and progresses through all the essentials, from cables, routers and hubs to building a wireless network. In clear, simple language, peppered with enough wry quips and jabs at the cult of IT to make it fun, Doug Lowe walks you through:
What a network is and how to use it
How to build a wired or wireless network
How to secure and optimize a network
How to troubleshoot a network
Safely connecting a network to the Internet
Networking with all major operating systems
This new edition of the bestselling guide features extensive updates on the latest networking tools and trends—including new Windows Vista and Server 2003 R2—the latest broadband options, new storage and back-ups, and an all new-chapter on VoIP and Internet telephony.

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