Patent ID: 7561698

Claim:
A system for automatic shutoff, comprising: a portable audio player for transmitting an audio signal; a user input mechanism for selecting functions and settings on the portable audio player; an external speaker system connected to the portable audio player for transmitting an audio signal output of the audio signal; a microphone attached to the portable audio player for receiving the audio signal output emanating from the speaker system and for reproducing the audio signal from the audio signal output; an audio detector connected to the microphone for assigning an audio signal value to the audio signal received from the microphone; a processor for storing an audio signal threshold value and a file copy of the audio signal and for comparing the audio signal value received from the audio detector to the stored file copy; a switch mechanism in the portable audio player for powering down the portable audio player, which is activated when the audio signal value fails to correlate to the stored file copy according to the audio signal threshold level value for a predetermined duration; and an audio signal threshold setting function in connection with the processor for setting the audio signal threshold value and for setting the predetermined duration as set by a user using the user input mechanism.