Apparatus for producing continuous graphic displays from intermi

Recorders – Writers – Receiver and marker movable

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340 155A, 340 155AP, 340324A, G01D 942

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active

039684997

ABSTRACT:
The minimum and maximum values attained by an analog data signal in each of successive sampling periods are determined by alternately operative amplitude detectors which produce and store a corresponding minimum and maximum signal for each of these periods. A generator produces a ramp signal which repeats in each period in synchronism with the sweep of the beam of a fiber optics strip cathode ray tube along the strip thereof. A record sheet is advanced at right angles to this strip. Comparators are operative in each period to compare the stored detector signals of the immediately preceding period with the ramp signal, and to produce an output when the ramp signal exceeds either of the detector signals. An EXCLUSIVE OR gate receives these outputs and unblanks the normally blanked tube beam for a time in each period to produce a line on the sheet extending along the strip between points representing the minimum and maximum signal values for the preceding period. The successive lines of the successive periods combine to form a recorded curve for the data signal.

REFERENCES:
patent: 2811665 (1957-10-01), McNaney
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patent: 3040320 (1962-06-01), Ikard
patent: 3383701 (1968-05-01), Smith et al.
patent: 3605109 (1971-09-01), Tyler et al.
patent: 3648270 (1972-03-01), Metz et al.
patent: 3714663 (1973-01-01), Smith
patent: 3715762 (1973-02-01), Magill et al.

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