Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1981-09-24
1984-04-17
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 77E, G01R 2316
Patent
active
044437579
ABSTRACT:
A multiplexed filter with n channels comprises at least one amplifier G.sub.2 with n feedback capacitors C.sub.5 to C.sub.8 associated with the switches S.sub.5 to S.sub.8. A switch-controlled resistance R.sub.2 (C'.sub.r, K.sub.5, K.sub.6, K.sub.7, K.sub.8) is connected to its input. Switching signals .phi..sub.i and .phi..sub.p out of phase with each other are supplied to the switches K.sub.5 to K.sub.8 while the multiplexing signals .phi..sub.1 to .phi..sub.4 are applied to the switches S.sub.5 to S.sub.8. The signal .phi..sub.1 has a period T.sub.1 and the signals .phi..sub.2 to .phi..sub.4 have periods T.sub.i =2.sup.(i-1) T.sub.1 where i=2 to 4. The period T.sub.1 is twice the period of .phi..sub.i and .phi..sub.p and the time intervals of all of T.sub.1 to T.sub.4 are equal to the period of .phi..sub.i and .phi..sub.p. This filter with n band pass ranges (n=4 in this example) can serve with advantage for the frequency analysis of an electrical signal delivered by a microphone.
REFERENCES:
patent: 3466431 (1969-09-01), Fuchs et al.
patent: 4179665 (1979-12-01), Gregorian
patent: 4306197 (1981-12-01), Gregorian
Asulab S.A.
Tokar Michael J.
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