Multiplexed electrical signal processor
US4443757A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1981 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Sep 24, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H19/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.