Reuse of plug detection contacts to reduce crosstalk
US9793658B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2015 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Apr 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2420/09
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An audio jack may include two contacts to electrically connect to a ground contact of an audio plug in order to detect that a metallic audio plug is inserted into the audio jack. A first of these two contacts may be grounded to form a current return path that generates a ground voltage at the ground contact of the audio plug. The second of these two contacts may be repurposed after the detection to sense the ground voltage. The sensed ground voltage may be added to right and left audio signals. The net voltages provided to the audio plug may be right and left audio signals that include the sensed ground voltage minus the actual ground voltage at the ground contact of the audio plug. This may remove the ground voltage from the net audio output signals, which may reduce crosstalk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.