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differentiator

[dif-uh-ren-shee-ey-ter] /ˌdɪf əˈrɛn ʃiˌeɪ tər/
noun
1.
a person or thing that differentiates.
2.
Computers. an electronic device whose output signal is proportional to the derivative of its input signal.
3.
Electricity, Electronics. a transducer or circuit (differentiator circuit) whose output is proportional to the rate of change of the input signal.
Origin
1885-1890
1885-90; differentiate + -or2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for differentiator circuit

differentiator

a device or set of components for performing the mathematical operation of differentiation-i.e., supplying an output proportional to the derivative of the input with respect to one or more variables. The many common examples of mechanical differentiators in which a displacement is differentiated with respect to time include speedometers and generators. In such devices, the derivative is frequently measured by deflections of spring-loaded elements

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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