Pyroelectric vidicon with improved signal-to-noise ratio

Details Pyroelectric vidicon with improved signal-to-noise ratio Pyroelectric vidicon with improved signal-to-noise ratio

1980-08-05

1984-03-13

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250333, 250334, 358223, H04N 533

Patent

active

044371187

ABSTRACT:
A pyroelectric vidicon has an improved signal-to-noise ratio by essentially eliminating pedestal noise and using signal gain to overcome preamplifier noise. Pedestal noise is substantially eliminated by charging the target, during the flyback read period, down to a small fixed value above the quiescent value. This is accomplished by setting the cathode potential, during the flyback read period, at a value below the reference value. The time duration of the flyback read period is such that the target is charged down to a value which is still above the quiescent value.

REFERENCES:
patent: 3774043 (1973-11-01), Le Carvennec
patent: 4100574 (1978-07-01), Felix

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