Zone plate signal generator

Details Zone plate signal generator Zone plate signal generator

1988-06-06

1989-08-08

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 10, H04N 1700, H04N 1702

Patent

active

048558265

ABSTRACT:
A generator of circular zone plate signals for testing digital television signals, particularly those in circuits conforming with CCIR-Rec. 601, contains counters operating at horizontal and vertical sampling scan frequencies for producing an orthogonal pattern. The phase values generated by ROMs in response to the horizontal and vertical counters are combined additively and then converted into amplitude values by another set of ROMs separately for the luminance and chrominance signals. The counters also drive still another set of PROMs that provide, through a logic circuit, modulation of the luminance signal to show horizontal and vertical frequency markers that can be turned on and off by switches. The horizontal marker PROM also produces chrominance blanking signals for eliminating frequency components above half the sampling frequency.

REFERENCES:
patent: 4322749 (1982-03-01), Weston
patent: 4408337 (1983-10-01), Pham Van Cang
patent: 4635096 (1987-11-01), Morgan
BBC Research Department Report; Jul. 1978; "The Zone Plate as a Television Test Pattern".
"The Zone Plate: Its Principles and Applications", by M. Weston; pp. 218-226.
Rec. 601-1 Section 11F: Digital Methods of Transmitting Television Information, pp. 319-321.

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