Wave transmission lines and networks – Coupling networks – Frequency or time domain filters and delay lines utilizing...
Patent
1977-10-05
1980-04-08
Smith, Alfred E.
Wave transmission lines and networks
Coupling networks
Frequency or time domain filters and delay lines utilizing...
333 19, 333173, H03H 714, H03H 710, H04B 1500
Patent
active
041975154
ABSTRACT:
By combining a number of integrators with periodically switching means, which are sensing an input signal during circularly successive time intervals, sampled values are available for some of the latest time intervals sampled with a sampling frequency. By switching these values in a successive manner to an analog arithmetic circuit, it is possible to obtain an output signal with useful band-pass and band-reject properties depending on the sampling period and the arithmetic operation. According to one preferred embodiment, the output signal is the mean over the latest time intervals, giving an averaging system which, contrary to RC circuits, has a strictly limited memory. According to another preferred embodiment, the output signal is the different between the outputs of two integrators.
REFERENCES:
patent: 3268824 (1966-08-01), Hinrichs et al.
patent: 3518557 (1970-06-01), Harmuth et al.
patent: 3681701 (1972-08-01), Maier
patent: 3714581 (1973-01-01), Sage
patent: 4032720 (1977-06-01), Morez et al.
Komachi et al.-"Lock-In Amplifier Using a Sampled-Data Synchronous Filter", 8 Journal of Physics E: Scientific Instruments 1975, pp. 967-971.
Nittrouer-"Modern Signal Processing Techniques for Overcoming Noise", Technical Notes T-200, Princeton Applied Research, 1968; 12 pages.
Gafvert Karl O. U.
Hornfeldt Sven P.
Nussbaum Marvin
Smith Alfred E.
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