NOISE INTERMODULATION LEVEL METER Russian patent published in 2005 - IPC

FIELD: radio engineering; measurement technology.

SUBSTANCE: device can be used for estimation of non-linear distortions introduced by processing sections or for amplification of low frequency signals, for example, sonic signals. The algorithm of operation of the system is based upon comparison of autocorrelation functions of random output and input signals. The task of estimation of introduced intermodulation distortions reduces to estimation of degree of changes in autocorrelation function of signal passed through non-linear circuits. Meter has random signal oscillator, band-pass filter, multiplexer, correlator, comparison unit and control unit.

EFFECT: improved precision of estimation.

5 cl, 5 dwg