Patent ID: 7171106
Filing Date: 2007-01-30
Classification: G08B,H04N

Abstract:
1. A method for processing and recording video signals generated by a plurality of video transmitters and propagated via video transmission lines to a recording receiver for outputting processed video signals and for feeding each of said processed video signals mixed with individually allotted code signals in timed sequence to a digital recorder; said code signals are generated and mixed into said video signals through at least one code generator and mixer circuit selected from a group consisting of individual code generator and mixer included in each of said transmitters, individual code generator and mixer extended along each of said transmission lines, multiple code generator and mixer included in said recording receiver and a combination thereof; said recording receiver including at least one timing circuit selected from a group consisting of a synchronous switch, time base corrector, external synchronizing generator, parallel video signals compressing circuit, parallel to serial converter and a combination thereof for processing and organizing the timing of said video signals and for outputting said processed video signals selected from a group consisting of externally synchronized, time base corrected, compressed, parallel to serially converted and a combination thereof in said timed sequence to said digital recorder having at least one main memory storage device for routine recording of said video signals in endless sequence rotation, and at least one secured memory selected from exclusive memory device and a portion of said main memory for retaining said video signals recorded during an alarm state and an alarm data signal input for triggering said alarm state, the method comprising the steps of: extracting said identification code from each sequencing individual video signal, for routinely storing individual processed video signals one after another in sequence along with the extracted identification code thereof, on the basis of the time and date of said routine recording, into said at least one main memory storage devices, one after another, each to its capacity, in endless cascaded rotation, wherein freshly recorded signals replace the oldest stored signals; at least one of duplicating and transferring said signals recorded during said alarm state to said at least one secured memory. Thereby retaining and protecting said signals recorded during said alarm state from routine replacement by said freshly recorded signals; retrieving said stored signals from said at least one main memory storage device and said at least one secured memory on the basis of said time and date of the routine recording of at least one of said stored signals and said stored identification code, and said alarm data signal; and decompressing the retrieved signals and re-injecting said identification code signals, with or without the time and date signals of the time and date of the recording of said retrieved signals, and with or without said alarm data signal into the vertical blanking portion of the decompressed video signals for outputting said decompressed video signals to a monitor and a playback receiver.