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Title:	POWER REDUCTION BY DYNAMICALLY VARYING SAMPLING RATE
Authors:	Datta, Srabosti
Keywords:	Digital signal processors Audio applications Dynamic voltage scaling frequency scaling sampling rate
Date Created:	2006
Publisher:	University of Kentucky
Abstract:	In modern digital audio applications, a continuous audio signal stream is sampled at a fixed sampling rate, which is always greater than twice the highest frequency of the input signal, to prevent aliasing. A more energy efficient approach is to dynamically change the sampling rate based on the input signal. In the dynamic sampling rate technique, fewer samples are processed when there is little frequency content in the samples. The perceived quality of the signal is unchanged in this technique. Processing fewer samples involves less computation work; therefore processor speed and voltage can be reduced. This reduction in processor speed and voltage has been shown to reduce power consumption by up to 40% less than if the audio stream had been run at a fixed sampling rate.
URI:	http://hdl.handle.net/10225/289
Appears in Collections:	Electronic Theses and Dissertations

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