Electronic security and surveillance system
US4511886A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1983 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Oct 6, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/085
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A security and surveillance system having a central monitoring station connected to a plurality of remote installations or subscribers by a transmission medium having a finite bandwidth. Each remote installation includes a plurality of surveillance equipment, including video, audio, and alarm signals, associated with a plurality of monitored locations. The security information collected by the surveillance equipment is serially sampled by a switcher which provides that information to an interface unit transmitter. The interface unit transmitter compresses the video information and decodes the alarm information and then using a key frequency and single side band modulation techniques modulates and sub-channelizes the processed security information into a frequency spectrum. The sub-channelized security information is translated in frequency and transmitted on the transmission medium. The information received at the central station is demodulated, and the alarm information monitored by means of a command computer. The system provides an upstream command channel so that the central station can communicate with each remote installation. The central station generates a master randomly v…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.