System for comparing a real-time waveform with a stored waveform

Details System for comparing a real-time waveform with a stored waveform System for comparing a real-time waveform with a stored waveform

1981-10-09

1983-06-07

Apley, Richard J.

Surgery

Truss

Pad

340721, 340722, A61B 500

Patent

active

043866140

ABSTRACT:
A system for storing time-varying kinesiograph waveforms and continuously displaying the stored waveforms on the screen of a cathode-ray tube (CRT). In a recording mode, the waveforms are periodically sampled, digitized, and then stored in a block of random access memory reserved for that waveform. In a display mode, the Y axis of the CRT is driven by a digital-to-analog converter which receives digitized samples from the memory block corresponding to the displayed waveform. The X axis of the CRT is driven by a second digital-to-analog converter, which, in an X-Y mode, also receives digitized samples from a selected block of memory. In a sweep mode, the X axis digital-to-analog converter receives the continuously incrementing memory addresses, which read out digitized samples from the memory block for the displayed waveform. The system may also display an expanded portion of a waveform in the sweep mode by incrementing the memory address from one of several predetermined values. In the X-Y mode, two pairs of kinesiograph waveforms may be displaced with respect to each other on the left and righthand sides of the CRT screen. A multiplexer for the X and Y axes allows a real-time kinesiograph waveform to be superimposed on the same stored waveform to facilitate mandibular movement comparisons. The system may also operate in a sensor positioning mode in which a line connecting the optimum position of the sensors and the current position of the sensors is generated on the screen of the CRT.

REFERENCES:
patent: 2416353 (1947-02-01), Shipman et al.
patent: 3406387 (1968-10-01), Werme
patent: 3522597 (1970-08-01), Murphy
patent: 3881059 (1975-04-01), Stewart
patent: 4222048 (1980-09-01), Johnson
patent: 4328491 (1982-05-01), Demetrescu et al.
patent: 4342086 (1982-07-01), Adib

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