Digital symbol generator with symbol error checking

Details Digital symbol generator with symbol error checking Digital symbol generator with symbol error checking

1980-08-05

1983-11-01

Smith, Jerry

Boots, shoes, and leggings

340730, 340739, 340791, G06F 3153

Patent

active

044133235

ABSTRACT:
A digital symbol generator for developing analog deflection voltages to drive a cathode ray tube display forming a plurality of symbols from successive blanked and unblanked vectors rotatable about an arbitrary angle of rotation. Each vector is specified by a binary representation of its polar coordinates including vector angle and length, rotation being accomplished by digital addition of the vector angle and angle of rotation. A line length counter generates a pulse train the number of pulses of which is proportional to vector length and the frequency of which is greater for blanked vectors than for unblanked vectors so that blanked vectors are drawn at a faster rate. Symbol error checking is accomplished by a vector closure technique wherein the symbology end point is measured at the output of the symbol generator and compared with the independently calculated true end point.

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