Programmable digital filter with substantially equal bandwidth i

Details Programmable digital filter with substantially equal bandwidth i Programmable digital filter with substantially equal bandwidth i

1994-04-11

1996-08-13

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

3647241, H04B 110, G06F 1717

Patent

active

055464319

ABSTRACT:
A shifter circuit of a digital filter circuit for providing an adjustable correction coefficient (.beta.) for the digital filter is described. The shifter circuit includes a first shifter for providing a first shift amount (S.sub.1) to an input signal, and a second shifter for providing a second shift amount (S.sub.2) to the input signal. Logic circuitry is provided in the shifter circuit that is coupled to the first and second shifters for receiving outputs of the first and second shifters under control of a control signal to generate an output signal of the shifter circuit with the adjustable correction coefficient (.beta.) such that digital filter has an adjustable bandwidth (BW) that is adjusted at a fine and substantially equal bandwidth increment. The adjustable correction coefficient (.beta.)is selectively derived from a combination of 2.sup.-S1 and 2.sup.-S2 such that the adjustable bandwidth (BW) is obtained from the equation: BW=-In(1-.beta.)/2.pi.T.sub.P.

REFERENCES:
patent: 4975702 (1990-12-01), Bazes
patent: 4980585 (1990-12-01), Bazes
patent: 5036230 (1991-07-01), Bazes
patent: 5103466 (1992-04-01), Bazes
patent: 5325318 (1994-06-01), Harris et al.

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