Thomson Licensing

Bts Broadcast Television Systems Gmbh

Winfried Deckelmann

Hans-Peter Richter

Sieghard Hasenzahl

Stefan Ott

For a possibly flexible use of an arrangement () for mixing and/or processing one or more video signals, the arrangement () includes video hardware components () which are implemented for a dedicated purpose and, within the arrangement (), are exclusively usable for said dedicated purpose, in that the arrangement () also includes video computers () which can alternatively perform a plurality of functions and are thus usable within the arrangement () for different purposes, dependent on their need, the video hardware components () being implemented for uses which are computer-intensive and/or require a large bandwidth, the video computers () being provided for uses which can be processed in real time by the video computers (), the arrangement () accommodating a control circuit () which assigns tasks to the video computers (), dependent on their need.

Arrangement for mixing and/or processing video signals

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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Weiterstadt, Germany

Winfried Deckelmann