IEEE 802.11 Standard's Evolution
Several lessons were learned as standards makers crafted 802.11a,b, and e. That's one of the reasons why 802.11n is so important.
October 31, 2006
Software Adds Smarts to Sensor Nets
A University of California at Berkeley team responsible for the TinyOS embedded operating system has formed a company to provide software intelligence to ZigBee and other wireless sensor networks. Arch Rock Corp.'s Primer Pack environment builds on middleware work done at Berkeley on three generations of "motes"--sensor nodes designed into meshes that use TinyOS 2 for self-discovery and monitoring. The work also included a dedicated database called TinyDB, used in making sensor information available through Web services via an application-layer language like the Extensible Markup Language.
October 30, 2006
Smartphone Buyer's Guide
Smartphones are building a loyal fan base and connecting to company networks. Here's our indepth investigation into the top smartphone vendors' strategies, strengths, and weaknesses.
October 30, 2006
Network, Physical Access Via One Device? Meet Mobio
Security startup Cryptolex emerges from stealth mode today with a handheld biometric security offering that can be used to access networks, applications, and door and building security systems.
October 23, 2006
Boosting LCD Brightness for Mobile Video Without Increasing Power
PenTile RGBW technology enables higher luminance levels for mobile displays without sacrificing resolution or increasing power usage, by adding a white subpixel to the traditional RGB Stripe layout of red, green, and blue, and then applying proprietary subpixel rendering technology to better align those subpixels with the way that people see. This ensures that display power and brightness resources are not wasted rendering images that cannot be seen by the human eye.
October 20, 2006
Spoken Word Search Analyzes Audio Content
Innumerable audio files available on the Web make searching based on keywords or metadata tricky. But spoken-word search technology is making it easier for enterprises to find the right audio content online.
October 19, 2006
Back to the Basics: Audio in the 21st Century - Part 2
In part 2 of Scott Janus' book serialization, we learn more about waveforms and their characteristics. This installment: period, frequency, phase offset, phase difference, phase quadrature, in phase, out of phase, and phase opposition.
October 17, 2006
Audio in the 21st Century
Sound is simply vibrations in matter. No matter what you may hear in most science fiction films, sound does not travel through a vacuum, no matter how big the ex-plosion is. This excerpt from Audio in the 21st Century provides a technical introduction to sound. Part 1 of an onging series.
October 17, 2006
'Backwards' Approach Leads to 1-pixel Camera
Remember how digital converters for audio started out at 8 bits, then went to 16 and 24 bits before resetting to 1 bit with oversampling? Engineers at Rice University will propose this week that we reset our megapixel cameras to 1 pixel and our video cameras to 1 voxel, both with oversampling.
October 16, 2006
JPEG2000 Codec for Robust, Scalable Video
The JPEG2000 wavelet-based algorithm generates a compressed codestream that retains the ability to easily extract different representations of the image, including different frame dimensions, without transcoding or recompressing. Yes, the name sounds dated (note MPEG-4 is even older, dating to 1998) but with the ability to simultaneously deliver HD and lower resolution video from the same signal, the six-year old JPEG2000 codec has a very bright future for broadcast, surveillance and consumer video applications, says Analog Devices.
October 13, 2006
Tear Down: Inside the Apple 8GB iPod nano
What makes the new 8GB iPod nano are the "mystery chips" that have been widely speculated about. These three Apple packaged components in the latest iPod nano have telltale marks that unequivocally prove the manufacturers.
October 8, 2006
ARM Seeks Help in Refining Mobile Security API
ARM Holdings has asked a handful of mobile chip makers to help define the next-generation applications programming interface for its TrustZone extensions to the ARM core.
October 5, 2006
Implementing ZigBee networks
As industrial control engineers study ZigBee, one of the decisions they'll have to make is how the tasks are handled. Here's a look at the reasons for picking single- versus multi-chip solutions.
October 4, 2006
Saving Power in Portable Applications
New techniques for multiple low-power modes, clock gating, dynamic voltage and frequency scaling will help developers deal with critical static and dynamic power requirements in battery-powered portable designs.
October 4, 2006
Catching the Z-Wave
It's the other home network: simple but reliable, this lesser-known protocol competes with the IEEE-supported ZigBee standard. The author explains the basics of Z-Wave and compares it with ZigBee.
October 2, 2006
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