HEADPHONE DETECTION CIRCUIT AND ELECTRONIC DEVICE WITH HEADPHONE DETECTION CIRCUIT

摘要

A headphone detection circuit includes a voltage output module and a trigger signal producing module. The voltage output module is used to produce a first voltage to trigger an audio amplifier to output amplified left and right channel signals to a loudspeaker when the headphone port is not connected to the headphone, and produce a second voltage to trigger the audio amplifier to output the amplified left and right channel signals to the headphone port when the headphone port is connected to the headphone. The trigger signal producing module is used to trigger the processing unit to output left channel signals and right channel signals with a relative higher gain when receiving the first voltage, and trigger the processing unit to output the left channel signals and right channel signals with a relative lower gain when receiving the second voltage.