Speakerphone control circuit
US4490582A · kind A · utility
10Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1983 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Feb 18, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
There is disclosed a speakerphone circuit employing precision peak detectors in which the processing of talk down signals and switch guard signals is partitioned in order to accurately control complementary switched gain in the transmit and receive channels to achieve improved sensitivity to talk down switching action by setting a low switching threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.