Cellular telephone headset
US5191602A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Jan 9, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6058
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone headset apparatus for use with an existing cellular telephone. The headset apparatus is modularly connectable to the existing cellular telephone system, and no electrical or mechanical modification of the existing telephone system is required. A "handset primacy" feature of the headset apparatus ensures that normal handset operation of the cellular telephone system is unaffected by the installation of the headset apparatus. In addition, the handset may remain resting in its cradle even while the headset is operated. A slave unit connects with the cellular telephone's transceiver unit, and a headset control unit connects both the headset and handset to the slave unit. The headset control unit contains a pushbutton for selecting headset operation, as well as a volume control dial for controlling the volume of sound reproduced by the headset's earpiece. The slave unit contains circuitry for controlling whether the handset, the headset, or both, are to be coupled to the telephone transmitting and receiving voice signal lines. The slave unit further contains circuitry for disabling the speaker-phone, if any, in the existing cellular telephone system when the headset is opera…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.