Test pattern signal generator for producing zone plate and other

Details Test pattern signal generator for producing zone plate and other Test pattern signal generator for producing zone plate and other

1991-01-09

1991-08-06

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328187, 328188, 358 10, H04N 1702

Patent

active

050382101

ABSTRACT:
A test pattern generator for digital television signals produces a zone plate pattern on an orthogonal pixel raster generated by pixel and line counters. The counter outputs are supplied to respective ROMs each storing a parabolic function. Their outputs are added to define zone plate circles on the basis of the circle equation x.sup.2 =y.sup.2 =r.sup.2. Circular patterns of evenly spaced color bars are produced by interposing a square root extracting ROM ahead of another ROM which converts the phase values into amplitude values. The optional interposition of a square root function after the addition and before the conversion into amplitude values provides a different circular test pattern. It can be readily modified in various ways under control of a microprocessor or EPROM.

REFERENCES:
patent: 4408337 (1983-10-01), Cano
patent: 4855826 (1989-08-01), Wischermann et al.
patent: 5003393 (1991-03-01), Riegel

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