New constructions of 3-dimensional optical orthogonal codes are presented. In each case the codes have ideal autocorrelation λa = 0, and cross correlation of λc = 1. All codes produced are demonstrated to be optimal. The constructions utilize a particular automorphism (a Singer cycle) of PG(k,q), the finite projective geometry of dimension k over the field of order q, or its affine analogue in ...

A PIV algorithm is presented for estimating time-averaged or phase-averaged velocity fields. The algorithm can be applied to situations where signal strength is not sufficient for standard cross correlation techniques, such as a low number of particle images in an interrogation spot, or poor image quality. The algorithm can also be used to increase the spatial resolution of measurements by allo...

Let d = (3 +1) 20 , where k is an odd integer. We show that the magnitude of the cross-correlation values of a ternary m-sequence {st} of period 3 − 1 and its decimated sequence {sdt} is upper bounded by 5 √ 3n + 1, where n = 4k.

Neher et al 2 Summary Typically, measurements that aim to predict perceived spatial impression of music signals in concert halls are performed by calculating the interaural cross-correlation coefficient (IACC) of a binaurally-recorded impulse response. Previous research, however, has shown that this can lead to results very different from those obtained if a musical input signal is used. The re...

In this paper, a coherence function technique is introduced for Tangible Acoustic Interfaces (TAI) using the Location Template Matching (LTM) approach. A simple workflow is proposed for the purpose of evaluating the performance of different TAI techniques and investigating the effect of various parameters based on experimental data. Performance analysis shows that the method of magnitude square...

Detecting a stationary, stochastic gravitational wave signal is complicated by the impossibility of observing detector noise independently of the signal. Here we describe a method of identifying this source of systematic error by varying the orientation of one of the detectors, leading to separate and independent modulations of the signal and noise contribution to the cross-correlation. The met...

­ Network intrusion detection sensors are usually built around low level models of network traffic. This means that their output is of a similarly low level and as a consequence, is difficult to analyze. Intrusion alert correlation is the task of automating some of this analysis by grouping related alerts together. Attack graphs provide an intuitive model for such analys...

In this study, seismic interferometry is investigated in which the Green’s function is estimated between two receivers by cross-correlation and integration over sources. For smoothly varying source strengths, the dominant contributions for the correlation integral come from the stationary phase directions in the forward and backward directions from the alignment of the two receivers. Gaussian b...