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Dynamic power management in a portable media delivery system

  • US 7,848,527 B2
  • Filed: 02/27/2006
  • Issued: 12/07/2010
  • Est. Priority Date: 02/27/2006
  • Status: Active Grant
First Claim
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1. A method for managing power in a media delivery system operable in either a DC or an AC mode arranged to output audio by way of one or more speakers, comprising:

  • setting a maximum allowable sound pressure level (SPL) of an output audio signal produced by the one or more speakers when the media delivery system is operating in the DC mode; and

    monitoring a charge status of an internal power supply that provides power to the one or more speakers by sensing, in real time, a voltage across a capacitor electrically coupled to the internal power supply, wherein the sensed voltage is directly related to the charge status of the internal power supply, when the charge status is less than a threshold value, then shutting down the media delivery system, otherwise, changing the maximum allowable SPL based upon the charge status of the internal power supply by reducing the maximum allowable SPL by a preset factor.

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