Automatic detection of kind of cable converter unit coupled to a VCR
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United States of America Patent
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Sep 5, 1995
Issued Date -
N/A
app pub date -
Feb 17, 1994
filing date -
Dec 13, 1991
priority date (Note) -
In Force
status (Latency Note)
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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.
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Family
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