While a great deal of experimental evidence supports the Reichardt correlator as a mechanism for biological motion detection, the correlator does not signal true image velocity. This study examines the accuracy with which physiological Reichardt correlators can provide velocity estimates in an organism’s natural visual environment. Both simulations and analysis show that the predictable statist...

A seven-port wave-correlator based vector network analyzer is proposed. The seven-port wave-correlator is a combination of two six-port wave-correlators which share common components. Furthermore, the complex wave ratio measurement accuracy is improved since the input signals can be directly detected by the side-arm ports. A seven-port wave-correlator is fabricated using microstrip branch line ...

An adaptive joint transform correlator for real-time pattern recognition is presented. A reference image for the correlator is generated with a new iterative algorithm. The training algorithm is based on synthetic discriminant functions. The obtained reference image contains the information needed to reliably discriminate a target against known false objects and a cluttered background. Calibrat...

Proposed HI structure observatories for studying the epoch of reionization (z ≈ 6–15) and dark energy (z ≈ 0–6) envision compact arrays with tens of thousands of antenna elements. Fully correlating this many elements is computationally expensive using XF or FX correlators, and has led some groups to reconsider direct imaging/FFT correlators. In this paper we develop a variation of the direct im...

We construct approximate formulas for the O(α3 s ) QCD contributions to the vector current correlator, which is valid for arbitrary values of momenta and masses. The derivation is based on conformal mapping and the Padé approximation procedure and incorporates known expansions in the low energy, threshold and high energy regions. We use our results to estimate additional terms in these expansions.

Although a great deal of experimental evidence supports the notion of a Reichardt correlator as a mechanism for biological motion detection, the correlator does not signal true image velocity. This study examines the accuracy with which realistic Reichardt correlators can provide velocity estimates in an organism's natural visual environment. The predictable statistics of natural images imply a...

The effective action for hard thermal loops in Quantum Chromodynamics (QCD) is related to a gauged Wess-Zumino-Novikov-Witten theory. Some of the technical issues of this approach are clarified and the Hamiltonian formulation is presented. The two-point correlator for the induced current in QCD is obtained; some simplifications of the dynamics of the longitudinal modes are also pointed out.

Low-area matched filter and correlator designs are explored in this thesis, for ADC resolutions of 1and 2-bits. Correlators are used extensively in spread-spectrum communication technologies, where they serve as a means of detecting a known pseudo-random sequence (PN code). The correlator designs presented here are intended for direct-sequence spread spectrum (DSSS) radio, where the data to be ...

The evidence and the theoretical justification of chiral symmetry restoration in high-lying hadrons is presented. I. CHIRAL SYMMETRY RESTORATION OF THE SECOND KIND It has recently been suggested that the parity doublet structure seen in the spectrum of highly excited baryons may be due to effective chiral symmetry restoration for these states [1]. This phenomenon can be understood in very gener...

This paper presents a voltage similarity circuit (bump circuit) based on novel correlator. The proposed is characterized by power consumption which depends the between two inputs. sensitivity of bump and are at highest values when inputs equal. As input voltages decreases, total current decreases with bell-shaped behavior. very simple in design, made new correlator combination differential pair...