Monitoring system for tv, cable and vcr

Details Monitoring system for tv, cable and vcr Monitoring system for tv, cable and vcr

H - Electricity

04

B

H04B 17/00 (2006.01) H04N 5/765 (2006.01) H04N 5/775 (2006.01) H04N 5/782 (2006.01) H04N 7/00 (2006.01) H04H 9/00 (2006.01)

Patent

CA 2147834

In a system for monitoring use of a video monitoring sys- tem, RF signals are injected into a cable converter (26) and a VCR (24) in order to detect channels selected by the cable conver- ter (26) and VCR (24). Installation of probes is not required for channel detection. Channel identification signals are also inject- ed into the VCR (24) and cable converter (26) for recording by the VCR on videotape. Respective channel identification signals are provided to the cable converter (26) and VCR (24) is deter- mined by injecting a code signal into the VCR (24) with time mul- tiplexing. The state of the "TV/VCR" switch of the VCR (24) and determining whether that signal is present in an RF video signal output by the VCR (24). The system includes a switch for inter- connecting the cable converter (26), VCR (24) and T.V. (22) and also for coupling injection signals to respective inputs of the cable converter (26) and VCR (24).

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