Patent ID: 9362689
Filing Date: 2016-06-07
CPC Classification: H01R,H04R

Claim Text:
1. A system comprising: a mobile computing device comprising an audio plug, wherein said audio plug comprises first and second contacts; a peripheral device comprising an audio jack, and a microprocessor; and a circuit connecting the audio jack and the microprocessor and used for detecting a microphone-in (MIC-IN) and a ground (GND) among the first and second contacts of the audio plug, wherein the MIC-IN comprises a higher voltage than the GND; wherein said circuit comprises a first comparator connected to a first switch and a second comparator connected to a second switch and wherein the first comparator connects to the first and second contacts of the audio plug and measures a first voltage between the first and second contacts and the second comparator connects to the first and second contacts of the audio plug in a reverse way and measures a second voltage between the first and second contacts and wherein the circuit further compares the first and second voltages between the first and second contacts and thereby identifies the MIC-IN and GND among the first and second contacts of the audio plug; wherein said circuit further comprises a resistor connected between first and second inputs of the first comparator and wherein the first and second inputs of the first comparator are connected to the first and second contacts of the audio plug and the resistor is used to establish the first voltage between the first and second inputs of the first comparator and the first and second contacts of the audio plug.