Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1994-02-17
1995-09-05
Brier, Jeffery
Facsimile and static presentation processing
Facsimile
Recording apparatus
348734, H04N 576
Patent
active
054483700
ABSTRACT:
A VCR controls a cable box, and monitors television signals received from the cable box in a "closed loop" manner. By monitoring an appropriate signal the controller of the VCR can detect perturbations of signal level which indicate that the cable box has changed channels. That is, the output signal of the cable box remodulated on, for example, the RF carrier frequency of channel 3, will be momentarily lost during the period in which the cable box changes channels. Thus, the subject apparatus can automatically determine the proper control code format for the cable box by issuing a channel change command and observing if the cable box responds to the channel change command. In one embodiment of the invention the VCR causes an on-screen display of an error message if it determines that it is unable to control the cable box.
REFERENCES:
patent: 4337486 (1982-06-01), Akutsu et al.
patent: 4425578 (1984-01-01), Haselwood et al.
patent: 4977455 (1990-12-01), Young
patent: 5034819 (1991-07-01), Tsukagoshi
patent: 5034820 (1991-07-01), Cho
patent: 5123046 (1992-06-01), Levine
Furrey John H.
Kim Sung J.
Brier Jeffery
Chevalier Robert
Emanuel Peter M.
Lenihan Thomas F.
Thomson Consumer Electronics Inc.
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