Patent ID: 7848527
Filing Date: 2010-12-07
Classification: G06F

Abstract:
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.