CONTROL CIRCUIT FOR CONTROLLING AUDIO SIGNAL OUTPUT OF EARPHONE

摘要

A control circuit for audio signal outputting of an earphone includes a central processing unit (CPU), an audio codec, an amplifier, and a detecting circuit. The audio codec receives audio signals from the CPU, and decodes the audio signals. The amplifier receives the decoded audio signals from the audio codec, amplifies the decoded audio signals, and outputs the amplified audio signals to the earphone. The CPU controls the detecting circuit to detect an impedance of the earphone, and controls the amplifier to adjust a volume of the audio signal output from the earphone according to the detected impedance of the earphone.

主权项

1. A control circuit for controlling audio signal output of an earphone, comprising:
a central processing unit (CPU); an audio codec receiving audio signals from the CPU and decoding the audio signals; an amplifier receiving the decoded audio signals from the audio codec, amplifying the decoded audio signals, and outputting the amplified audio signals to the earphone; and a detecting circuit; wherein the CPU controls the detecting circuit to detect an impedance of the earphone, and controls the amplifier to adjust a volume of the audio signal output from the earphone according to the detected impedance of the earphone.