Time multiplexing hybrid sample data filter

Details Time multiplexing hybrid sample data filter Time multiplexing hybrid sample data filter

1975-04-22

1976-10-19

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

325 38B, 332 11D, G06F 1534

Patent

active

039872882

ABSTRACT:
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 mutliplexing 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.

REFERENCES:
patent: 3633170 (1972-01-01), Jones, Jr.
patent: 3814917 (1974-06-01), Nussbaumer
patent: 3822404 (1974-07-01), Croisier et al.
patent: 3906400 (1975-09-01), Gooding et al.
G. B. Lockhart, "Digital Encoding & Filtering Using Delta Modulation" The Radio & Elect. Engr. vol. 42, No. 12, Dec. 1972, pp. 547-551.
Peled & Liv, "A New Approach to the Realization of Nonrecursive Digital Filters" IEEE Trans. on Audio & Electro. vol. AU-21, No. 6, Dec. 1973, pp. 477-484.

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