| 摘要 |
An audio plug detection structure is disclosed, which is adapted for an audio jack corresponding to an audio plug and includes a first and second connection points, a time-varying signal generation circuit, and a comparison circuit. The time-varying signal generation and comparison circuits are connected to the first connection point. When the audio plug is inserted into the audio jack, the first connection point is connected to a first pole of the audio plug and the second connection point is connected to a second pole different from the first pole of the audio plug. Therefore, the time-varying signal generation circuit, the first connection point, an inner impedance circuit of the audio plug and the second connection plug form a loop. The comparison circuit outputs a determination signal indicating the audio plug is inserted by detecting a change of a time-varying signal generated by the time-varying signal generation circuit. |
| 主权项 |
1. An audio plug detection structure, applicable to an audio jack corresponding to an audio plug, comprising:
a plurality of connection points, disposed on an inner side of the audio jack, one-to-one or multiple-to-one connected to a plurality of pole points of the audio plug when the audio plug is inserted into the audio jack, wherein each of the plurality of connection points is connected to a functional circuit or a chip pin corresponding to each of the plurality of pole points of the audio plug or a ground terminal, the plurality of connection points comprise a first connection point and a second connection point, and when the audio plug is inserted into the audio jack, the first connection point is connected to a first pole point of the plurality of pole points, and the second connection point is connected to a second pole point of the plurality of pole points; a time-varying signal generation circuit, connected to the first connection point and outputting a time-varying signal; and a comparison circuit, connected to the first connection point and receiving the time-varying signal, and comparing the time-varying signal with a reference signal; wherein when the audio plug is inserted into the audio jack, the time-varying signal generation circuit, the first connection point, an inside impedance circuit of the audio plug, and the second connection point form a loop, and the comparison circuit outputs a determination signal to determine the audio plug is inserted into the audio jack by comparing a variation of the time-varying signal with the reference signal. |
