Telephone system with automatic volume control
US5604798A · kind A · utility
Inventors
Key dates
| Filing date | Apr 18, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Apr 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/715
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A You Talk Two Phone is provided that is a true two handset telephone device. With conventional telephones, when more than one telephone is bridged to a phone line the amplitude of the incoming and outgoing signals drop as telephones are added. The You Talk Two Phone contains two handsets and circutry that automatically adjusts internal amplifier gain to compensate for the extra handset even when not in use. The invention has audible and visible indicators of incoming calls as well as lamps that indicate when either or both handsets are in use. A jack is provided that allows a conventional phone to plugged in, or an additional You Talk Two Phone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.