초록 ▼

An electronic circuit with an output that may be used, for example, to control a servo system which positions grinders of a tire grinding machine to correct tires with large cleats is disclosed. The electronic circuit is responsive to an analog electrical signal to detect whether or not the rate of

An electronic circuit with an output that may be used, for example, to control a servo system which positions grinders of a tire grinding machine to correct tires with large cleats is disclosed. The electronic circuit is responsive to an analog electrical signal to detect whether or not the rate of change in amplitude of the analog electrical signal equals or exceeds a preselected limit. If the rate of change in amplitude of the analog electrical signal does not equal or exceed the preselected limit, the output of the electronic circuit has a characteristic that is similar to the analog electrical signal. If the rate of change in amplitude of the analog electrical signal equals or exceeds the preselected limit, the output of the electronic circuit preferably remains constant at an amplitude which the analog electrical signal attained prior to the change in amplitude at a rate equal to or in excess of the preselected limit. Broadly, the electronic circuit functions as a slope discrimination system which permits passage of an analog electrical signal if the rate of change in amplitude is below a predetermined rate but blocks passage of the analog electrical signal when the rate of change in amplitude reaches or surpasses the predetermined rate. Circuitry is preferably provided to adjustably preset the value for the preselected limit. Additional circuitry is preferably provided to facilitate automatic reset during operation.

대표청구항 ▼

An electronic circuit for detecting an analog electrical signal having a rate of change in amplitude equal to or greater than a predetermined rate, comprising: first connection means for connecting an analog electrical signal from an external source to a) circuit means having a time constant and to

An electronic circuit for detecting an analog electrical signal having a rate of change in amplitude equal to or greater than a predetermined rate, comprising: first connection means for connecting an analog electrical signal from an external source to a) circuit means having a time constant and to b) a first input of a comparator; said circuit means being responsive in a first state to said analog electrical signal for inverting said analog electrical signal; second connection means for connecting said inverted analog electrical signal from said circuit means to said first input of said comparator; said time constant being effective to produce a difference signal at said first input of said comparator whenever the rate of change in amplitude of said analog electrical signal is not less than a predetermined rate, said difference signal causing said comparator to produce an indication signal whenever said rate of change is at least equal to said predetermined rate; a switch alternatively operative in a first mode and a second mode; switch control means connected to said switch for controlling said switch; and third connection means for connecting said comparator to said switch control means; said switch control means being responsive to place said switch in said first mode in the absence of said indication signal and being responsive to place said switch in said second mode in the presence of said indication signal; said switch being operative in said first mode to cause said circuit means to assume said first state for inverting said analog electrical signal; said switch being operative in said second mode to cause said circuit means to assume a second state for storing the amplitude of said analog electrical signal at the time said indication signal is produced.