Velocity controlled CRT auto tracking system

Details Velocity controlled CRT auto tracking system Velocity controlled CRT auto tracking system

1989-03-23

1990-05-01

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 1704

Patent

active

049223283

ABSTRACT:
A digital auto tracking system compares sampled operating data from a CRT with corresponding reference data and develops an error signal therefrom. The error signal is truncated to produce a desensitized three bit error signal. Three AND gates each have one input supplied with the three error bits, respectively, and three programmable velocity control bits are supplied to the other inputs by a microprocessor. A demultiplexer has a plurality of input taps that are coupled together so as to provide a minimum of zero and a maximum of seven clock pulses depending upon the outputs of the AND gates. The clock pulses sequence up/down counters in accordance with the derived error signal. The speed or velocity of change in response to the error signal is determined by the velocity control bits which may be microprocessor controlled for optimum block and white tracking of the particular cathode ray tube.

REFERENCES:
patent: 4562479 (1985-12-01), McDonald
patent: 4587566 (1986-05-01), Hinn
patent: 4723158 (1988-02-01), White

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