In-service cable television measurements

Details In-service cable television measurements In-service cable television measurements

1990-11-19

1991-12-17

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 86, 358 21V, 358145, H04N 1700, H04N 710, H04N 704

Patent

active

050738224

ABSTRACT:
A cable television measurement system uses a modified spectrum analyzer for determining both carrier-to-noise and triple beat ratios for a cable television (CATV) system. The modified spectrum analyzer is triggered for single sweep during the vertical interval of a selected channel, and the noise amplitude, peak sync tip amplitude and frequency of the channel are determined. The carrier-to-noise ratio is determined from the noise amplitude and the peak sync tip amplitude and the ratio and frequency are displayed. For triple beat ratio measurements a headend unit coupled between a television signal source and a combiner in the CATV headend prior to distribution offsets a selected channel by a predetermined frequency for a specified number of lines in the vertical interval. The modified spectrum analyzer measures the peak sync tip amplitude and a triple beat amplitude at the end of the specified number of lines. The triple beat ratio is determined from the triple beat amplitude and the peak sync tip amplitude and displayed.

REFERENCES:
patent: 3469190 (1969-09-01), Rheinfield
patent: 3651403 (1972-03-01), Fluck, Jr.
patent: 4023104 (1977-05-01), Rheinfield
patent: 4207431 (1980-06-01), McVoy
patent: 4408227 (1983-10-01), Bradley
patent: 4700222 (1987-10-01), Large et al.

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