Abstract

Rippled-spectrum signals are known for measurements of ripple density resolution. Such signals used previously had uniform ripple patterns across the entire signal’s frequency band. In the present study, signals consisted of two overlapping test and additional patterns with different ripple densities. Ripple density resolution in the test signal was measured as a function of ripple density in the additional pattern. Two discrimination tasks were conducted: either discrimination between a rippled test signal and rippled reference signal or a non-rippled reference signal. The additional pattern reduced the resolution of the test signal in general. For a rippled reference signal, the effect of the additional pattern could be explained by decreased ripple depth in the test signal. For a non-rippled reference signal, the resolution of the test signal was lower for a rippled than for a non-rippled additional pattern. In such a case, there was no dependence on the density of ripples in the additional pattern. The last cannot be explained by a decrease of the ripple depth and was interpreted as a manifestation of temporal processing equivalent to the reveal of a delayed segment of the autocorrelation function of the test signal. [This study was supported by Russian Foundation for Basic research, Grant No. 20-015-00054.]

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