Multifrequency linear filter networks with active elements

Details Multifrequency linear filter networks with active elements Multifrequency linear filter networks with active elements

1974-09-30

1976-04-20

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340311, 340171PF, H04Q 1102

Patent

active

039522881

ABSTRACT:
A linear filter network incorporating active elements, and which obeys the relation f.sub.t .varies..sqroot.G.sub.1 G.sub.2, where f.sub.t is the band-pass center frequency of the network; and G.sub.1 and G.sub.2 are the conductance values of certain network circuit elements, has its transfer function for bandpass output controlled by a group of switchable conductances (G.sub.1 G.sub.2) in a digitally-controllable switching system that reduces the number of conductances required to achieve a given number of discrete pass-bands all having the same, or constant, bandwidth. A network that is switchable among 10 or more frequencies is used in a tone-responsive paging system for response to one or more of a series of calling tones or frequencies that follow each other in equal frequency intervals or steps ".DELTA.f" chosen so that for a series of "n" steps no tone in the series is harmonically related to any of the others.

REFERENCES:
patent: 3098220 (1963-07-01), De Graaf
patent: 3629837 (1971-12-01), Fraunfelder

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