Field responsive vertical pulse generator

Details Field responsive vertical pulse generator Field responsive vertical pulse generator

1985-02-19

1986-12-23

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358154, 358158, H04N 704

Patent

active

046315870

ABSTRACT:
In an NTSC television system there are an odd number (262.5) of horizontal lines in each field. This relationship causes a 50% duty cycle horizontal rate signal (H) to be high during one specific horizontal half line in one field and low for that same horizontal half line in the other field. A 2H rate signal is normally divided by 525 with counters to obtain a field rate. The outputs of the counters are combined with a regenerated horizontal rate signal (H) to generate a plurality of unique addresses. This provides a mapping for each field to within a half horizontal line resolution. These addresses can be decoded by a programmable logic device or other devices to define half, single or groups of horizontal lines in one or both fields.

REFERENCES:
patent: 4245251 (1981-01-01), Steckler et al.
patent: 4498103 (1985-02-01), Aschwanden

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