Phase distortion detection circuitry for low cost automatic equa

Details Phase distortion detection circuitry for low cost automatic equa Phase distortion detection circuitry for low cost automatic equa

1981-09-30

1984-01-03

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 35, 358139, 358 10, H04N 531

Patent

active

044245335

ABSTRACT:
A system for detecting phase distortion in video signals due to multipath effects includes circuitry for extracting the high and low frequency content of a horizontal synchronization signal, and for comparing the phase of the high frequency content to the low frequency content to produce a signal indicative of phase distortion in the video signal. The phase distortion signal may be applied to distortion reduction circuitry, and specifically in a three tap delay line equalizer, to reduce phase distortion in the video signal.

REFERENCES:
patent: 3334301 (1967-08-01), Sarkany et al.
patent: 3911478 (1975-10-01), Rhodes
patent: 4044381 (1977-08-01), Shimano et al.
patent: 4127874 (1978-11-01), Iwasawa et al.
patent: 4128848 (1978-12-01), Nakagawa
Schmid, "The Measurement of Linear Chroma Distortion in NTSC TV Facilities, " IEEE Transactions on Broadcasting, vol. BC-18, No. 3, Sep. 1972, pp. 77-80.

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