Test pattern generators

Details Test pattern generators Test pattern generators

1982-06-30

1985-01-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 331153, H04N 702

Patent

active

044955197

ABSTRACT:
A test pattern generator comprises vertical line pulse generating circuit (20) for generating a first pulse train (VL) and a second pulse train (Hi), the first pulse train being used to display vertical lines on a raster scan display apparatus and including, between successive pulses of the second pulse train, a number of pulses equal to the number of vertical lines. A horizontal sync pulse generating circuit (30) receives the second pulse train and generating a horizontal sync pulse train (M sync). A vertical blanking and sync pulse generating circuit (40, 42, 44, 46) is connected to the horizontal sync pulse generating circuit for generating a vertical sync pulse train (V sync) and a vertical blanking pulse train (Vb), and a horizontal line pulse generating circuit (50) generates a horizontal line pulse train (HL), used to display horizontal lines, in response to the horizontal sync pulse train and the vertical blanking pulse train.

REFERENCES:
patent: 3376518 (1968-04-01), Emmer

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