Signal transition detection method and system

Details Signal transition detection method and system Signal transition detection method and system

1987-06-18

1988-06-07

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

235436, 235462, 250568, 307518, 307358, 328164, H03K 508, H03K 5153

Patent

active

047498790

ABSTRACT:
A system and method are provided for determining the occurrence of transitions in a binary encoded analog input signal. The system includes a threshold circuit, responsive to the input signal, for generating first and second grating signals in dependence upon whether the input signal exceeds or is less than a first threshold level, respectively. A first circuit means, responsive to the input signal, differentiates the input signal to form a first derivative signal. A threshold circuit, responsive to the first derivative signal, generates third and fourth gating signals in dependence upon whether the first derivative signal exceeds a second threshold level or is less than a third threshold level, respectively. A second circuit means, responsive to the first derivative signal, differentiates the first derivative signal to form a second derivative signal. The second derivative signal has zero crossings which are detected by a zero crossing means, responsive to the second derivative signal and to the first, second, third and fourth gating signals.

REFERENCES:
patent: 3892949 (1975-07-01), Dodson, III
patent: 4000397 (1976-12-01), Hebert et al.
patent: 4131857 (1978-12-01), Clymer
patent: 4697098 (1987-09-01), Cloke

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