Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-01-12
1984-01-10
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
3581911, 455150, H04M 100
Patent
active
044255780
ABSTRACT:
A system and method is provided for determining the channel to which a video wave receiver is tuned. The system includes an RF signal source connected to the antenna input of the video wave receiver, a frequency control stage that determines the signal frequencies generated by the RF signal source and a system and advance control stage to appropriately program operation of the frequency control stage. The RF signal source is conditioned by the system and advance control stage and the frequency control stage to output signals such that the fundamental or one of the harmonics when combined with the video carrier of a corresponding channel results in a signal having a predetermined frequency. The RF signal source is successively advanced to output a set of predetermined frequencies, corresponding to each of the receivable channels to which the video receiver is tunable. The system includes a detector/receiver arranged to monitor the video signal of the video receiver to detect the predetermined frequency resulting from the combined signal from the RF signal source and a video carrier to which the video receiver is tuned. The RF signal source is stepped through a predetermined set of frequencies corresponding to each receivable channel and the system outputs a signal denoting the received channel to which the video receiver is tuned when the predetermined frequency is detected by the detector/receiver.
REFERENCES:
patent: 3864636 (1975-02-01), Fukuda et al.
patent: 4020419 (1977-04-01), Caspari et al.
patent: 4216497 (1980-08-01), Ishman et al.
Haselwood Donald E.
Thumm Jeffrey R.
A. C. Nielsen Company
Chin Tommy P.
Coles Edward L.
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