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 who 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 varying reference frequency which is used to produce all of the unique key frequencies for each remote installation. There is also provided a backup on-site recorder and an alternative downstream transmission capability.

This invention relates generally to electronic security and surveillance systems for monitoring a large number of remote installations or facilities by a central monitoring station, and more particularly concerns electronic circuitry and methods for transmitting and receiving security information between each remote installation and the central monitoring station over a transmission medium having a finite information bandwidth.

Submit manuscripts at https://www.scholarscentral.org/submissions/industrial-electronics-applications.html or an e-mail attachment to the Editorial Office at manuscript@scitechnol.com

Best Regards,
Editorial Manager
Journal of Industrial Electronics and Applications
Email: industrialelect@peerreviewedjournal.org