Multiplexer commutated high pass filter

Details Multiplexer commutated high pass filter Multiplexer commutated high pass filter

1976-03-08

1977-06-21

Birmiel, Howard A.

Communications: electrical

Selective

Having electron beam device

340 155TS, 179 15A, 179 15BL, 340183, 328137, 328151, 328154, 307243, G01V 122, H03K 1756, H04Q 1104

Patent

active

040315061

ABSTRACT:
A multi-channel analog system comprises a plurality of channels each being adapted to receive analog signals from a signal source such as a seismic sensor. A multiplexer multiplexes the analog channels prior to converting the channels' signals into digital numbers. Each channel has a DC blocking capacitor connected to one terminal of a normally-open multiplexer switch; the other terminal of the switch is coupled to a multiplexer bus. In accordance with this invention, the bus is connected to a common resistor. Control means consecutively close the multiplexer switches so that the capacitor whose switch has been closed forms a high-pass filter with the common resistor. The resistor is preferably connected as the input resistor to an operational amplifier. The capacitors, the multiplexer, and the common resistor form a multiplexer-commutated high-pass filter which is particularly adapted for multi-channel seismic systems.

REFERENCES:
patent: 2773982 (1956-12-01), Trousdale
patent: 2900504 (1959-08-01), Weiss
patent: 2958857 (1960-11-01), Johnson et al.
patent: 3604950 (1971-09-01), Anderson
patent: 3659054 (1972-04-01), Koch

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