METHOD AND DEVICE FOR MEASURING BY CORRELATION, IN REAL TIME, THE DELAYS BETWEEN MATCHING ELECTRICAL SIGNALS

摘要

The device according to the invention comprises: - n independent delayed lines, which are connected in parallel are provided for receiving said first signal at said first point, n being equal or greater than two, - samples of said first signal taken at n different sampling frequencies are stored - in said n delayed lines respectively, samples of said second signal are taken in the direct line at one of said n frequencies, and - the correlation function between the samples of the direct line and the samples of one of said n independent delay lines is calculated, said one of said n independent delay lines being determined as a function of the value of the measured delay. The invention finds an application for measuring the speed of a movable object advancing in linear manner, such as for example a web of paper.