Interfacing circuit for a removable microphone
US8059838B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Sep 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides an interfacing circuit for a removable microphone. In one embodiment, the interfacing circuit comprises a jack for receiving the removable microphone and an integrated circuit comprising a biasing circuit, a buffer amplifier, and an insertion detecting circuit. The jack comprises a first terminal receiving an output voltage of the removable microphone and a second terminal coupling the removable microphone to a ground voltage source. The integrated circuit is coupled to the first terminal of the jack via a first node. The biasing circuit, coupled between the first node and a second node, biases the removable microphone and passes only an alternative current (AC) portion of the output voltage of the removable microphone to the second node. The buffer amplifier, coupled to the second node, buffers the AC portion to generate a voltage signal. The insertion detecting circuit, coupled to the first node, generates an insertion signal indicating whether the removable microphone is inserted in the jack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.