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EE Times Special SectionsSeptember 08, 2008 issueAudio pros look, listen and learn September 08, 2008 issue A new standard for surround sound Until recently, the implementation of surround sound for radio broadcast has faced considerable challenges. Compatibility issues, poor surround quality and the high bit rates required for surround transmission, among other factors, have conspired to put the brakes on the multichannel juggernaut, leaving analysts and professionals to wonder exactly when 5.1 radio might finally become a practical proposition. September 08, 2008 issue Getting smaller and more powerful The usual amplifier metaphor is a "straight wire with gain," the ideal being a linear multiplier of audio signal voltages neither adding nor subtracting from their sonic quality. Thus, audio performance is asymptotic and not open-ended--making an amp perform "better" means only that it more closely approaches a perfect reproduction of the input signal. September 08, 2008 issue Why audio needs standards September 08, 2008 issue My 6 biggest digital audio blunders September 08, 2008 issue Evolution and design Twenty years ago, when someone wanted real-time audio on a personal computer, it typically meant toggling bit 1 in I/O port 97 to generate a pulse waveform through the PC's small built-in annunciator speaker. Ten years ago, real-time audio on a PC typically meant buying a PCI-bus plug-in sound card. In the past decade, however, the vast majority of PCs have emerged from the shipping box ready to play with motherboard audio solutions based on the Audio Codec (AC) '97 specification and its successor, the Intel High Definition Audio (HDA) multichannel spec. September 08, 2008 issue Optimizing dynamic range of balanced audio inputs Balanced interfaces are ubiquitous in professional audio systems due to their ability to reject common-mode hum and noise. They are especially important in long-distance connections where each end has a different ground reference. Maximizing common-mode rejection (CMR) is often a primary concern of designers. This article explores another important consideration--maximizing dynamic range. September 08, 2008 issue Secrets of Audio ADC buffer design Several aspects of audio converter design are generally not well understood but have a dramatic impact on performance, both measurable and audible. One of these is interfacing to the sampling networks of highly oversampled multibit delta-sigma A/D converters, and it is probably the least understood topic in A/D systems design. September 08, 2008 issue Audio engineering: More challenging than you'd think It might be tempting to think that designing for audio--with its "nominal" frequency band of 20 Hz to 20 kHz--is elementary and offers few new challenges. The authors of this special report, however, who all specialize in audio engineering, know differently. September 08, 2008 issue Audio pros look, listen and learn Next month the Audio Engineering Society (AES) will hold its 125th convention in San Francisco, bringing together top-notch researchers, engineers (audio, electrical, software and acoustic) and manufacturers for a four-day gathering (Oct. 2 through Oct. 5). July 21, 2008 issue Lenovo trains for personal best In some ways, the Beijing Olympics reaffirms a passing of the torch in computing. July 21, 2008 issue Innovation stars hit the world stage The China that greets the world next month for the 2008 Summer Olympic Games wasn't imaginable 40 years ago. July 21, 2008 issue Olympics technology: LEDs brighten the venues Contractors for the Beijing Olympics considered fluorescent lighting for some of their key venues until they evaluated light-emitting diodes and found them to be a more colorful, lower-power route to illuminating their creations. July 21, 2008 issue Olympics technology: RFID's the ticket for secure Games When the 2008 Summer Olympic Games open in August, the event will put more than athletes in the spotlight. July 21, 2008 issue For large--really large--screens, only LEDs make the cut How do you choose a panel technology for a display that's bigger--at 33 by 33 feet--than the side of a barn? July 21, 2008 issue Olympics technology: Keeping 'em honest About 4,500 separate tests will be performed at the Summer Olympic Games in Beijing to screen the participating athletes for banned substances. July 21, 2008 issue Locals will tune in--on analog How many people in China will watch the Beijing Olympic Games on mobile phones? July 21, 2008 issue Local spec takes its mark For some observers, the performance of the athletes next month will take a backseat to the performance of China's much-anticipated, homegrown 3G wireless network. The time-division, synchronous code-division multiple-access (TD-SCDMA) 3G network began commercial trial rollouts in earnest on April 1. It is scheduled to cover at least 10 Chinese cities in time for the Games, Aug. 8-24 July 21, 2008 issue Olympics technology: Planners' heads are in the clouds Everyone talks about the weather, but the organizers of the Beijing Olympics are doing something about it. July 21, 2008 issue Torch is passed to MEMS Microelectromechanical system (MEMS) chips have been built into the Olympic Torch--not the one that traveled around the world, but the replicas that spectators will wave at the 2008 Beijing Summer Olympics. July 21, 2008 issue ART work: driverless rail China has made large investments in transport systems throughout Beijing to ease the way for the 3 million spectators who will pour into the city for the Olympics.
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