Facsimile transmission method and system
US4000371A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Mar 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/33307
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two facsimile devices, each capable of operating in a plurality of communication modes and having at least one common communication mode are connected together by a telephone line. One of the devices sends to the other a plurality of low and high group frequency signals arranged in a code designating the possible communication modes of the device. The other device receives the signals, determines from them a common communication mode based on its own possible communication modes in accordance with a priority arrangement, and sends high and low group frequency signals to the first device indicating the selected common communication mode so that both of the facsimile devices are set to the selected common communication mode prior to the transmission of graphic information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.