Patent ID: 7576649

Claim:
An anti-theft alarm system for a portable computer, the anti-theft alarm system comprising: a controller; a button for delivering an anti-theft enabling signal to the controller; a transistor; and a motion sensor for detecting unauthorized movement of the portable computer from a stationary position and sending a detection signal to the controller, the controller sending an alarm control signal to an audio portion when the detection signal is received, the audio portion producing an audible sound for a theft deterrence effect when the alarm control signal is received, wherein in response to receipt of a detecting signal, the controller outputs a mute-disabling signal to the audio portion for disabling a possible mute status of the audio portion, wherein the audio portion comprises: a speaker; a codec for converting the alarm control signal to an analog audio signal; and an audio amplifier for amplifying the analog audio signal to make the speaker sound an alarm, the transistor includes a collector connected to an earphone input of the audio amplifier, and a base receiving an earphone bypass input from the controller for making the speaker sound the alarm even if an earphone is plugged into the portable computer.