Showing papers on "Bessel filter published in 1970"
TL;DR: In this paper, a simple recurrence technique for fast generation of spherical Bessel functions of order n and real or complex arguments is presented, especially when the order of the function is less than the magnitude of the argument.
Abstract: A simple recurrence technique for fast generation of spherical Bessel functions of order n and real or complex arguments is presented. The technique is accurate and very efficient, especially when the order of the function is less than the magnitude of the argument.
4 citations
TL;DR: where the integral is to be interpreted as the Cauchy principal value and the sign represents the natural extension of the function El(z) ~ f~ e-$.
Abstract: where the integral is to be interpreted as the Cauchy principal value. Except for the sign, it represents the natural extension of the function El(z) ~ f~ e-$
TL;DR: In this article, a device for the operation of correlation at microwave frequencies (L-band) was described, where two transmission mode yttrium-iron-garnet delay lines were magnetically biased for magnetoelastic wave propagation.
Abstract: A device is described which performs the operation of correlation at microwave frequencies (L-band). Signal delay is provided by two transmission mode yttrium-iron-garnet delay lines magnetically biased for magnetoelastic wave propagation. Variation of delay is effected by electronically changing the magnetic bias on each delay line. Because group and phase delay are different functions of applied magnetic field, the autocorrelation function obtained for band-limited signals exhibits a sidelobe structure dependent on group delay variation and a fine structure which depends on phase delay variation. Calculations and experimental results are given for a sinusoidally frequency-modulated signal of large modulation index. This signal has a power spectrum with sharply defined frequency limits, easily variable bandwidth, and provides an autocorrelation function with a zero-order Bessel function amplitude variation.