Telephone headset interface circuit
US4782524A · kind A · utility
18Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | May 5, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/58
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An interface circuit interfaces a four wire telephone circuit to a telephone headset. An adjustable receiver portion of the interface circuit receives a line input signal from the four wire circuit and produces a headset input signal limited to a predetermined signal level. An adjustable output portion of the interface circuit accepts a headset output signal and conditions it for use as a line output signal on the four wire circuit. A DC voltage is also supplied to a headset microphone through the output portion of the interface circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.