Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
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
Deckelmann Winfried
Ott Stefan
Richter Hans-Peter
Britton Howard W.
BTS Broadcast Television Systems GmbH
LandOfFree
Test pattern signal generator for producing zone plate and other does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Test pattern signal generator for producing zone plate and other, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Test pattern signal generator for producing zone plate and other will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1991000