Sawtooth waveform generating circuit for utilization in a helmet

Details Sawtooth waveform generating circuit for utilization in a helmet Sawtooth waveform generating circuit for utilization in a helmet

1980-07-10

1981-12-01

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 93, H01J 2970, H01J 2972

Patent

active

043038689

ABSTRACT:
A sawtooth waveform circuit for a cathode ray tube display apparatus or the ike is disclosed for providing a sawtooth waveform signal in synchronization with the uniformly spaced pulses of a sync signal. A direct current voltage is supplied to an integrator which produces a ramp voltage. Switching means responsive to each pulse of the sync signal shorts the integrator so as to cause the ramp voltage to appear at the output of the integrator as a sawtooth waveform signal. A summing amplifier amplifies the sawtooth waveform signal, and then combines the amplified sawtooth waveform signal with a variable direct current voltage generated by a head tracker so as to provide at the output of the summing amplifier a raster drive signal.

REFERENCES:
patent: 3885095 (1975-05-01), Wolfson et al.

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