Alarm circuit and electronic device utilizing the same

摘要

An alarm circuit applied in an electronic device includes an audio interface, an audio processor, a speaker, and a control unit. A first terminal of the control unit is coupled to the audio interface, to receive a first control signal or a second control signal. A second terminal of the control unit receives an alarm on/off signal. A third terminal of the control unit is coupled to the audio processor. When the second terminal of the control unit receives the alarm on signal, and the first terminal of control unit receives the first control signal meanwhile, the alarm on signal is transmitted to the alarm processor through the third terminal of the control unit, and the audio processor outputs the alarm signal through the speaker unit, to warn the user the mobile phone is being stolen immediately.

主权项

1. An alarm circuit comprising:
an audio interface configured to be coupled to a plug, wherein the audio interface outputs a control signal; an audio processor coupled to the audio interface and configured to start or halt an audio decoding signal based on the control signal; a speaker unit coupled to the audio processor and outputting an alarm signal based on the audio decoding signal; a switch unit comprising a slide switch which is configured to output an alarm on signal or an alarm off signal; and a control unit comprising a first terminal coupled to the audio interface for receiving the control signal, a second terminal receiving the alarm on signal or the alarm off signal, a third terminal coupled to the audio processor.