X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1994-02-02
1996-08-06
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 982, H04N 100
Patent
active
055442145
ABSTRACT:
A video system, for example an X-ray examination apparatus, includes a variable gain video amplifier (20) whose gain is varied by a control circuit (40), which produces a control signal at a control input (23) of the amplifier. The value of the control signal is derived to the control circuit from the ratio of a reference value (Vref) to the amplitude of the amplified video signal (Vu). This amplitude is measured in a detector (30) which supplies an amplitude signal (Vd) as input for the control circuit. By combining this ratio with the already adjusted gain (K), stored in a memory (47), practically instant adaptation of the gain is possible when the amplitude (Vi) of the input signal changes.
REFERENCES:
patent: 4910592 (1990-03-01), Shroy, Jr. et al.
patent: 5003572 (1991-03-01), Meccariello et al.
Porta David P.
Slobod Jack D.
U.S. Philips Corporation
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