Abstract
A comparatively simple and inexpensive instrument capable of computing autocorrelation functions is described. It was built for the analysis of irregularity in yarn, roving and slivers in the textile industry, but it should find application in a much wider field in cases where the high accuracy of the expensive precision computer is not required. The instrument also lends itself to the computation of cross-correlation functions. Principles of operation and construction are given together with data on performance. The yarn irregularity is recorded on a magnetic tape as a frequency-modulated signal and use is made of a modified d.c. watthour meter for carrying out the multiplying and integrating operations.
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