CCTV system using multiplexed signals to reduce required cables
US5623304A · kind A · utility
19Cited by
25References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1994 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cable-saving type CCTV system for transmitting a multiplexed video signal over a single coaxial cable connecting a camera site and a control site by frequency-modulating a bi-directional audio signal and producing a digital control signal and a digital alarm signal and multiplexing the resultant signals and an external synchronizing signal in a blanking period of the video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.