Abstract
A cross-correlation function of two time-varying signals and two spatial signals is considered analytically for real-time signal processing. An electro-optical heterodyne signal processor with a set of two successive ultrasonic light modulators and two optical masks is simply used because this optical system is not so sensitive in its alignment as conventional Mach-Zehnder-like interferometers for photomixing. As two special cases, a convolution function of two rectangular pulses fed to both the modulators and a correlation function of a rectangular pulse, fed only to one of the modulators, with a rectangular aperture made in one mask are produced experimentally for verification.
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