TY - GEN
T1 - Extending the lifetime of media recorders constrained by battery and flash memory size
AU - Kim, Younghyun
AU - Cho, Youngjin
AU - Chang, Naehyuck
AU - Chakrabarti, Chaitali
AU - Cho, Nam Ik
PY - 2008
Y1 - 2008
N2 - The lifetime of a stand-alone media recorder is a function of both the battery size and flash memory size. In this paper, we present a power management framework for media recorders that significantly enhances their lifetime while minimizing the flash memory usage and maintaining the same level of recording quality. This is achieved by implementing a mixture of encoding algorithms of different complexities that generate data with different compression ratios, and in turn balancing the energy consumption and the flash memory usage. The proposed method can be effectively employed on a direct battery drive system which does not use a DC-DC converter. The gradual drop of the battery voltage of such system is compensated by operating algorithms of lower complexity more and more. For a speech encoding application where a mixture of ADPCM (low complexity) and MP3 (high complexity) is used, the proposed algorithm achieves 70% more lifetime than a DC-DC converter with a highest clock frequency, and 20% more lifetime than even a DC-DC converter with the optimal clock frequency.
AB - The lifetime of a stand-alone media recorder is a function of both the battery size and flash memory size. In this paper, we present a power management framework for media recorders that significantly enhances their lifetime while minimizing the flash memory usage and maintaining the same level of recording quality. This is achieved by implementing a mixture of encoding algorithms of different complexities that generate data with different compression ratios, and in turn balancing the energy consumption and the flash memory usage. The proposed method can be effectively employed on a direct battery drive system which does not use a DC-DC converter. The gradual drop of the battery voltage of such system is compensated by operating algorithms of lower complexity more and more. For a speech encoding application where a mixture of ADPCM (low complexity) and MP3 (high complexity) is used, the proposed algorithm achieves 70% more lifetime than a DC-DC converter with a highest clock frequency, and 20% more lifetime than even a DC-DC converter with the optimal clock frequency.
KW - Dynamic voltage scaling
KW - Multimedia
KW - Passive voltage scaling
UR - http://www.scopus.com/inward/record.url?scp=57549089870&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=57549089870&partnerID=8YFLogxK
U2 - 10.1145/1393921.1393964
DO - 10.1145/1393921.1393964
M3 - Conference contribution
AN - SCOPUS:57549089870
SN - 9781605581095
T3 - Proceedings of the International Symposium on Low Power Electronics and Design
SP - 159
EP - 164
BT - ISLPED'08
T2 - ISLPED'08: 13th ACM/IEEE International Symposium on Low Power Electronics and Design
Y2 - 11 August 2008 through 13 August 2008
ER -