(redirected from correlate)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Idioms, Wikipedia.


A device that detects weak signals in noise by performing an electronic operation approximating the computation of a correlation function. Also known as correlation-type receiver.



(correlation-type receiver), an instrument used to measure the correlation functions of random processes. A knowledge of the correlation coefficient permits an analysis to be made of physical phenomena having probabilistic characteristics, such as the noise in radio receiving apparatus, cosmic particle showers, and biopotentials (see). When two random signals in the form of AC electrical voltages U1(t) and U2(t) are supplied to the inputs of a correlator, its output voltage is proportional to the cross-correlation function of these signals. If a signal Uc(t) is supplied to both inputs, the correlator measures the autocorrelation coefficient.

Electronic correlators are the most widely used. The indicator is usually a pointer-type instrument calibrated in terms of the correlation coefficient, or a cathode-ray tube. Provision is usually made for the connection to a digital or a chart recording system. Correlators are employed in radio-communication devices (to measure the transient attenuations in multi-channel systems); in radar, sonar, and radio astronomical equipment (for correlation direction finding and to improve the resolution of transmission); and in medical diagnostic equipment. The signals studied in a cross-correlation have frequencies ranging from 1 Hz to 50 MHz. Special signal-processing methods are used to raise the signal frequency factor to 500 MHz. The measuring gauge for the correlation coefficient ranges from 0.01 to 1, and the error of the correlator is between 5 and 10 percent.


Lange, F. Korreliatsionnaia elektronika. Leningrad, 1963. (Translated from German.)
Mirskii, G. la. Radioelektronnye izmereniia, 2nd ed. Moscow, 1969.
Valitov, R. A., and V. N. Sretenskii. Radiotekhnicheskie izmereniia. Moscow, 1970.


References in periodicals archive ?
Correlates of psychological hardiness in Canadian adolescents, Journal of Social Psychology, 127, 339-344.
That may happen because the brain correlates image changes with the action of certain sets of muscles, allowing it to interpret the effect of eye movements correctly.
One of the roadblocks companies face when implementing a BSM solution is being able to correlate and understand the massive amounts of heterogeneous business and systems data in their environment.
Monitoring over 550 networks worldwide to gather, correlate and evaluate an unparalleled volume of information, we give our customers the industry's broadest real-time view of, and response to, global IT security threats.
With this new integration, IBM Tivoli customers are provided with a value-added solution that can automatically analyze and statistically correlate performance monitoring data in real-time, increasing overall productivity and decreasing costs.
Together, the products provide customers with a comprehensive performance monitoring infrastructure solution that can automatically analyze and correlate performance monitoring data in real-time.
The goal of any OEM is to eliminate product returns, and we learned from listening to our OEM customers -- with products that can include hundreds if not thousands of parts from multiple sources including suppliers and subcontract manufacturers -- that there aren't any sufficient off-the-shelf software systems that effectively correlate information on the types and quantities of parts or products that are failing, following the shipment of their products to the market," said Nader Fathi, CEO at SigmaQuest.