Digital filter for filtering complex signals

Details Digital filter for filtering complex signals Digital filter for filtering complex signals

1976-03-10

1977-04-26

Smith, Jerry

Registers

Transfer mechanism

Traveling pawl

333 18, 333 70T, G06F 738, G06F 1534

Patent

active

040203336

ABSTRACT:
In a Fermat representation of numbers, the imaginary operator j is a real number which is a power of two. This is applied here to the implementation of complex digital filters, i.e., filters deriving the real and imaginary components of the desired filtered signal y by processing the components of the input signal x. Let (xm, xm) and (ym, ym) be samples of the real and imaginary components of x and y, respectively. The samples xm are delayed to provide j xm in the Fermat system, then both xm and j xm are fed to digital adders to provide xm + j xm and xm - j xm, which are separately applied to the input of transversal digital filters. The outputs of said filters are combined in simple digital adders to provide the desired y components.

REFERENCES:
patent: 3679882 (1972-07-01), McAuliffe
patent: 3906347 (1975-09-01), Motley et al.
patent: 3914588 (1975-10-01), Nussbaumer
patent: 3926367 (1975-12-01), Bond et al.

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