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Energy-Efficient Technologies for the Dismounted Soldier (1997) / Chapter Skim
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Appendix E
Pages 263-266

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From page 263...
... depicts the evolution of a speech-operated system implemented in software from a standard laptop computer to a belt-worn computer to a handheld device. The effectiveness of the design is measured by a figure of merit defined by real time response divided by the volume multiplied by the weight and the power normalized to fruity for the laptop.
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From page 264...
... Further examination indicated that even when the system was idle the operating system was making more than 150 different types of calls to system utilities that consumed energy, not only in the processor but also in the peripheral devices, such as the hard disk drive by keeping it actively spinning. By replacing the functionality of the old idle loop with a halt instruction, the processor was able to enter standby mode and save more than a factor of two in energy consumption.
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From page 265...
... 265 O w: lo: o~ so .
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From page 266...
... Power reductions made over the two generations of the Navigator speechoperated system are examples of what can be accomplished using standard PC hardware by moving from general-purpose operation to function-specific operation. Much greater improvements, by factors of 10 to 100, can be achieved by moving away from PC hardware platforms to dedicated embedded systems.
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Key Terms

  • speech recognition
  • processor clock
  • mbyte disk
  • basic hardware
  • energy consumption

  • pcmcia card
  • standby mode
  • hard disk
  • loading programs
  • circuit enabled

  • accomplished using
  • recognition pcmcia
  • actively spinning
  • dedicated speech
  • speech application

  • energy usage
  • examination indicated
  • separate dedicated
  • application pcmcia
  • recognition card

  • mhz dsp
  • hardware configuration
  • power normalized
  • merit defined
  • called navigator

  • main storage
  • processor operating
  • halt instruction
  • cut energy
  • power reductions


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