Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-10-25
1993-08-03
Peng, John L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 10, 358 86, 358145, 358 21V, 455 31, 455 674, H04N 1700
Patent
active
052334180
ABSTRACT:
A non-interference method of determining the frequency characteristics of a cable television (CATV) system adds an RF test pulse to an RF video signal in the vertical interval between equalizer pulses. A gated receiver coupled to the distribution system receives the RF video signal only during the vertical interval and extracts the envelope of the RF test pulse, with the sync pulses being attenuated. RF pulses of different frequencies within each channel of the CATV system are used to determine the frequency characteristics of each channel.
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TEK User's Manual, Part, No. 070-7789-01, Product Group 2F. "2721/2722 Non-Interfering Sweep System" Latest Revision Jan. 1991.
Gumm Linley F.
King Richard T.
Gray Francis I.
Hsia Sherrie
Peng John L.
Tektronix Inc.
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