Realtek Semiconductor Inc.

Chu-Ting Su

Yi-Shu Chang

Wen-Chi Wang

Jul-Cheng Huang

An apparatus and method of automatic identification an external audio input/output device. The external device connected to an audio jack is identified as an audio output or input device, according to the impedance thereof. Furthermore, the present invention automatically selects the most suitable internal circuit to connect to the external device.

Apparatus for automatic identification of audio input/output device and method thereof

An Audio Codec which comprises a power selecting circuit an audio compiler circuit and a control amplifier circuit. The power selecting circuit receives at least a primary power source and an auxiliary power source and outputs a working power selected from the power sources. The auxiliary power source is selected and output to the control amplifier circuit only when the computer is at a power-off status. When the computer is power-on, the primary power source will be selected and output to both the audio compiler circuit and the control amplifier circuit. Therefore, the Audio Codec of the present invention only needs one set of internally furnished control amplifier circuit to both operate on the normal power-on status and perform the Power OFF CD function.

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Hsinchu, Taiwan

Chu-Ting Su