Patent ID: 8406434

Claim:
An audio processing system, comprising: an audio processor, receiving a data signal, and processing the data signal to generate a processed signal, wherein the audio processor comprises: at least one gain control circuit, generating a gain signal according to a volume control signal, a reference signal, and a feedback signal; and at least one operational amplifier, coupling to the gain control circuit, and amplifying the data signal by the gain signal to generate the processed signal; an audio amplifier, coupling to the audio processor, and amplifying the processed signal to generate an amplified signal; a USB port, receiving an audio signal; a USB controller, coupling to the USB port and the audio processor, and receiving the audio signal to generate the data signal; and an input device coupling to the USB controller, wherein the volume control signal is inputted to the audio processing system via the input device, wherein the reference signal is selected from the data signal.