Bts Broadcast Television Systems Gmbh

Stefan Ott

Hans-Peter Richter

Winfried Deckelmann

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.

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Ulm, Germany

Stefan Ott