Secret communication control apparatus
US5001750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1990 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Mar 7, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A secret communication control apparatus used to effect secret communication with communication equipment, for example, facsimile equipment, which transmits picture information by use of public communication lines. When a communication control code that is utilized to set a communication mode is to be transmitted, the intervention of the secret communication control apparatus in the communication is suspended by switching a change-over switch, so that the main body of the local communication equipment and the remote communication equipment perform direct transmission of the communication control code therebetween without passing it through the secret communication control apparatus. It is therefore possible to transmit the signal in the minimized time, that is, in the same way as in the case of ordinary, nonsecret communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.