Accession Number : ADD008422
Title : Commutating Narrowband Filter.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Campbell,Kenneth J
Report Date : 30 Dec 1980
Pagination or Media Count : 6
Abstract : This abstract describes a signal to be filtered that is applied to a commutating filter which is controlled by a tunable oscillator tuned to a desired filter frequency. The commutating filter includes a plurality of RC networks to whcih the input signal is sequentially connected. The output of the commutating filter is a series of discrete voltages from the capacitor sections and of the RC networks which are fed to an analog to digital converter. The resulting digital words produced by the converter are stored in a microprocessor and used to compute the spectral content of the input signal by means of the Discrete Fourier Transform. The computed output from the microprocessor represents the effect of the cascaded filter sections of the system.
Descriptors : *Patents, *Bandstop filters, *Signal processing, Tuned circuits, Analog to digital converters, Networks, Q factors, Digital filters, Discrete fourier transform, Microprocessors, Data storage systems
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE