Digital filter

Details Digital filter Digital filter

1998-01-29

1999-12-14

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327 47, 36472416, 375350, H03K 500

Patent

active

060022973

ABSTRACT:
In a bandpass filter, a first cyclical analogue signal V3 at a center frequency divided by integer N in divide 44 and the divided signal supplied to a digital filter 48 as its system clock; a second cyclical analogue signal at a frequency, to be measured, differing by a small amount from the center frequency, is delayed by N cycles by a dynamic store 54; a substractor 56 subtracts the second signal from the delayed second signal and supplies any difference to the digital filter 48; the output of the digital filter is related to the frequency of the second signal, but the center frequency is suppressed. The filter may be used in an interrogation for an electronic detection system in which an interrogation signal is modified in frequency by a small amount, characteristic of a device to be detected.

REFERENCES:
patent: 4325030 (1982-04-01), Xolamonico
patent: 5271039 (1993-12-01), Suzuki
Patent Abstracts of Japan vol. 7, No. 233 (E-204) [1378], Oct. 15, 1983 & JP, A, 58 121802 (Matsushita Denki Sangyo KK), Jul. 20, 1983, see abstract.
Nachrichtentechnische Zeitschrift N.T.Z., vol. 36, No. 12, Dec. 1983, Berlin, Germany, pp. 806-808, XP002019332 Hausszmann Wolfgang: "Ein Digitaler Demodulator fur Equidistant Abgetastet FM-Signal".

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