Showing papers on "Bessel filter published in 1988"

Analog MOS integrated circuits

Abstract: The goal was to design single-chip lowpass filters with constant group delay in the pass band and 60 dB minimum attenuation in the stop band. The desired 3 dB frequencies are (in Hertz) 2.5, 5, 10, 20, 40, 80, 160, and 320. A filter class that satisfies the constant delay (linear phase) requirement while providing quite a narrow transition band is the Bessel-Chebyshev filters. It was found that the 7th order Bessel-Chebyshev response satisfied the requirement of the filter.

Robust and adaptive control of a beam deflector

Abstract: A DC-motor driven beam-deflector is to be controlled such that the beam moves with constant velocity for 12 ms out of a 20-ms period before swinging back to the original position One control system must serve any deflector without retuning The problem is difficult because the dynamics vary from one deflector to another It is found that a closed-loop system with poles in a Bessel filter configuration will satisfy the specifications A straightforward pole-placement design is insufficiently robust Redesigning it yields greater, but still insufficient, robustness against the known extent of plant parameter variation The problem is solved by adding an adaptive control loop >

On the bilateral generating functions of simple Bessel polynomial

Abstract: In this note the bilateral generating relation of simple Bessel polynomial derived by Das, Chongdar and Chatterjea has been extended by using the group-theoretic method. An application of our result is also pointed out.