Patent ID: 7961895
Filing Date: 2011-06-14
Classification: H04R

Abstract:
1. An audio interface, comprising: a connector, electrically connected with a microphone plugged thereinto; an analog readout circuit, acquiring an analog audio signal from an analog microphone; a digital readout circuit, acquiring a digital audio signal from a digital microphone; and a decision circuit, selectively connecting the analog or digital readout circuit to the connector to acquire the analog or digital audio signal respectively according to whether the microphone plugged into the connector is analog or digital; wherein the decision circuit comprises: a detection unit, detecting a type of the microphone plugged into the connector; and a switching unit, connecting either the analog readout circuit or the digital readout circuit to the connector according to detection of the detection unit; wherein the connector is an audio jack connector with a tip contact, a ring contact, first and second sleeve contacts, corresponding to a plug configuration of the digital microphone; wherein one of the first and second sleeve contacts is connected to a reference ground, and the other receives the digital audio signal from the digital microphone plugged into the connector; and wherein the detection unit controls the switching unit to connect the digital readout circuit to the connector such that the digital readout circuit sends an active voltage and a clock signal to the microphone plugged into the connector through the tip and ring contacts of the connector, whereby the detection unit detects that the microphone plugged into the connector is the digital microphone when receiving a data signal from the microphone plugged into the connector at the first or second sleeve contact not connected to the reference ground, otherwise detects the microphone plugged into the connector is analog and alternately controls the switching unit to connect the analog readout circuit to the connector.