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US 4,344,037 AGranted
System and method for analyzing tonosignals
AssigneeCavitron Corporation
InventorCharles W. Ragsdale
Life of this patent
Estimating the term…
Abstract
A system and method analyzes tonosignals and other electrical signals such as those representative of force-displacement information from applanating probes initially to determine the presence of an acceptable waveform or tonosignal. Once an acceptable waveform is found, that waveform is analyzed further to locate the point of applanation. The level of the waveform at that point may be converted to a digital signal and displayed to indicate the pressure within the eye or other objects to which the probe is applied.
Claims7
In a system for analyzing the waveform of an input signal:
- a threshold detector, means for coupling said input signal to said threshold detector, a timer coupled to the output of said threshold detector, a time window circuit coupled to the output of said timer, a differentiator circuit for producing an output signal corresponding in level to the magnitude of the slope of said input signal, means for coupling said input signal to said differentiator, level detector means coupled to the output of said differentiator for detecting a change of slope of said waveform beyond a predetermined value, a pulse width discriminator coupled to the output of said level detector means, and means responsive to the outputs of both said time window circuit and said pulse width discriminator for providing a utilization signal corresponding substantially to the level of said input signal at the time of said change in slope.
Dependencies are inferred from the claim text.