In-service CATV HUM measurement technique

Details In-service CATV HUM measurement technique In-service CATV HUM measurement technique

1993-01-08

1995-02-28

Kostak, Victor R.

Television

Monitoring, testing, or measuring

Transmission path testing

348180, H04N 1700

Patent

active

053941853

ABSTRACT:
An in-service hum and low frequency distortion measurement technique for in-service cable television channels having a video modulated carrier frequency obtains peak samples of the horizontal sync signal to effectively filter out the vertical interval frequency. The data record formed by the peak samples is filtered and input to a fast Fourier transform to obtain magnitude values for the fundamental and first harmonic frequency components corresponding to a powerline. From these magnitude values hum and low frequency distortion is computed as a percentage relative to the amplitude of the carrier frequency. The same procedure may be used with an input CW signal in an out-of-service measurement for hum only, the difference between the in-service and out-of-service measurements determining the low frequency distortion due to the video signal.

REFERENCES:
patent: 4686457 (1987-08-01), Banno
patent: 5073822 (1991-12-01), Gumm
patent: 5075618 (1991-12-01), Katayama
patent: 5103402 (1992-04-01), Morton
No Loose Ends the Tektronix Proof-of -Performance Program for CATV by Clifford B. Schrock. Copyright 1973 Tektronix Inc.

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