Accession Number : ADD003262

Title :   Time Multiplexing Hybrid Sample Data Filter.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Franks,Lewis E

Report Date : 19 Oct 1976

Pagination or Media Count : 5

Abstract : The patent describes a hybrid sample data filter system using quantized data of an analog signal obtained from a delta modulator. A shift register having N preselected taps is fed by the delta modulator. Each of the N taps are fed to a series of AND gates corresponding to the R stages of a coefficient counter and between the stages of the coefficient counter and the AND gates are coefficient setting switches set in accordance with the predetermined weighting of the output taps of the shift register. A ring counter having N stages is also fed to the AND gates for time multiplexing with each of the stages of the ring counter feeding those AND gates that are fed by the corresponding tap of the shift register. Each of the AND gates fed by the same stage of the R stage coefficient counter is combined in one of a series of N-input OR gates, the output of which is fed to a R-input digital-to-analog converter. A demodulating filter is then connected to the output of the digital-to-analog filter.

Descriptors :   *Patents, *Filters, *Data processing equipment, Hybrid systems, Time division multiplexing, Delta modulation, Shift registers, Digital to analog converters, Gates(Circuits)

Subject Categories : Electrical and Electronic Equipment
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE