Periodic noise widely appears in raw images and is often accompanied with white noise. The removal of such compound noise is a challenging problem in image processing. To avoid using the time-consuming methods such as Fourier transform, a simple and efficient spatial filter called optimal soft morphological filter (OSMF) is proposed in this paper. The filter is a combination of basic soft morph...

Periodic noise is perceived as different from ordinary non-repeating noise due to the involvement of echoic memory. Since this stimulus does not contain simple physical cues (such as onsets or spectral shape) that might obscure sensory memory interpretations, it is a valuable tool to study sensory memory functions. We demonstrated for the first time that the processing of periodic noise can be ...

We report the effect of doubly stochastic resonance which appears in nonlinear extended systems if the influence of noise is twofold: A multiplicative noise induces bimodality of the mean field of the coupled network and an independent additive noise governs the dynamic behavior in response to small periodic driving. For optimally selected values of the additive noise intensity stochastic reson...

This paper gives experimental proof of an intriguing physical effect: periodic on–off switching of MOS transistors in a CMOS ring oscillator reduces their intrinsic 1=f noise and hence the oscillator’s close-in phase noise. More specifically, it is shown that the 1=f phase noise is dependent on the gate-source voltage of the MOS transistors in the off state. Measurement results, corrected for w...

This paper focuses on periodic motions and chaos relative to the impacting chatter and stick in order to find the origin of noise and vibration in such a gear transmission system. Such periodic motions are predicted analytically through mapping structures, and the corresponding local stability and bifurcation analysis are carried out. The grazing and stick conditions presented in [Luo & O’Conno...

Current approaches for detecting periodic motion assume a stationary camera and place limits on an object's motion. These approaches rely on the assumption that a periodic motion projects to a set of periodic image curves, an assumption that fails in general. Using a ne-invariance, we derive necessary and sufcient conditions for an image sequence to be the projection of a periodic motion. No re...

It was demonstrated recently that noise in an optimal window allows a bistable system to operate reliably as reconfigurable logic gates (Murali et al., 2009) [1], as well as a memory device (Kohar and Sinha, 2012) [11]. Namely, in a range of moderate noise, the system can operate flexibly, both as a NAND/AND/OR/NOR gate and a Set Reset latch. Here we demonstrate how the width of the optimal noi...

Noise pollution remains a challenging problem requiring the development of novel systems for noise insulation. Extensive work in field acoustic metamaterials has led to various ventilated structures which, however, are usually demonstrated rather narrow regions audible spectrum. In this work, idea metamaterial-based is further extended, developing concept metahouse chamber representing structur...