Accession Number : ADD008422

Title :   Commutating Narrowband Filter.

Descriptive Note : Patent,


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