Geometric correction circuit for ultrasonic scan display
AssigneeSonometric Systems, Inc.
InventorKai E. Thomenius
Life of this patent
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Abstract
Circuitry for generating a distortion-free sector display in a cathode ray tube for displaying signals from an ultrasonic transducer moving back and forth in an arcuate path. Sine and cosine beam sweep signals are developed using signals respectively representing the angular position .theta. of the transducer on its angular path (representing the sine) and 1-.theta..sup.2 /2(representing the cosine). A transducer position signal is stored on a relatively large capacitor, and a capacitor of smaller capacitance is used to generate a ramp signal in producing the sine and cosine beam sweep signals.
Claims8
In ultrasonic scan and display apparatus utilizing a transducer pulsed at a relatively high frequency and which moves back and forth in an arcuate path at a relatively lower frequency, the improvement for generating a beam deflection signal to produce a sector display in a cathode ray tube comprising first capacitor means of relatively large capacitance for storing a signal related to the angular position of said transducer in said path, second capacitor means of relatively small capacitance for generating a signal producing a trace sweep of the beam in said cathode ray tube, and first gate means for coupling together and decoupling said first and second capacitor means at a rate dependent upon said transducer pulsing frequency.
Dependencies are inferred from the claim text.