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Technical Papers
AudioDE™ - THE AUDIO POWER-PLAY FROM ARM®
by Steve Steele, ARM Data Engines (published in IQ Magazine)
We examine various aspects of the AudioDE processor in detail; the core architecture, subsystem autonomy and system-level software integration. We take a look at third-party software support for AudioDE and review the types of product where AudioDE is typically used; portable media players, music cell phones, wireless headsets and digital radio.
THE BEST-SOUNDING MP3 PLAYERS
SPIRIT software within Sigmatel's chip has won CNET quality contest inside one of the best-sounding MP3 players.
A group of CNET editors listened to a lineup of high-profile, high-capacity MP3 players and rated them based on sound quality. Purely a subjective (though blind) comparison, the experiment involved listening to high-quality MP3s in a variety of genres on players set at factory settings.
ECHO CANCELLATION DEMYSTIFIED
Today it is easy to implement echo cancellation on DSPs and this is what engineers are doing in their devices. However, many of them face certain difficulties with achieving echo cancellation because of incomplete understanding of the echo cancellation principles and not meeting the requirements imposed by the echo cancellers. The information provided herein is based on the experience of developing echo cancellers and supporting echo canceller customers at SPIRIT.
SPEAKER VERIFICATION AND IDENTIFICATION SYSTEMS FROM SPIRIT
by Vladimir Sviridenko, SPIRIT's CTO
A great importance of voice technologies for biometrics has been proved many times. Still, only a high level of implementing automatic speaker verification and identification systems (SVI-systems) can provide putting such technologies in practice. They are applied in security systems (controlling the access to a room or to data resources), bank technologies, e-commerce and law-enforcement practice.
FRAMEWORK FOR TELEPHONY
Since invention of a telephone by Alexander Graham Bell in 1875, telephony has become a widely used means of information interchange. In the beginning, it was primarily used for transmitting human voice over telegraph wires. It is now possible to make phone calls all around the globe, quickly connect people that are thousands of miles far from one another, and talk to each other as easy as if the talking parties were in the same room. It is due to recent (and not so recent) technology advances and this very fact that the telephony is so widely spread, a number of other uses of the telephony appeared, not to mention several improvements in the telephony itself and its services.
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