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A Comparative Study of Dynamic Voltage Scaling Techniques for Low-Power Video Decoding



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A Comparative Study of Dynamic Voltage Scaling Techniques for Low Power Video Decoding Eriko Nurvitadhi and Ben Lee School of Electrical Engineering and Computer Science Oregon State University nurviter benl eecs orst edu Chansu Yu Department of Electrical and Computer Engineering Cleveland State University c yu91 csuohio edu Abstract This paper presents a comparison of power aware video decoding techniques that utilize Dynamic Voltage Scaling DVS capability Three techniques were simulated and compared in terms of power consumption accuracy and deadline misses The simulation results show that the dynamic per frame technique where the decoding time prediction adapts to the particular video being decoded is the most promising approach due to its feasibility of implementation and comparable performance to the ideal case Our findings also indicate that in general as the number of available processor settings increases the amount of power saving increases but the number of deadline misses increases as well More importantly most of these deadline misses are within 10 20 of the playout interval and thus insignificant However video clips with high variability in frame complexities combined with inaccurate decoding time predictions may degrade the video quality Finally our results show that a processor with 13 voltage frequency settings is sufficient to achieve near maximum performance with the experimental environment and the video workloads we have used Keywords Dynamic voltage scaling video decoding lowpower techniques decoding time prediction 1 Introduction Power efficient design is one of the most important goals for mobile devices such as PDAs handhelds and mobile phones As the popularity of multimedia applications for these portable devices increases reducing their power consumption will become increasingly important Among multimedia applications delivering video will become the most challenging and important applications of future mobile devices Video conferencing



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