Title:
MULTIPLE HIGHHANDDBAND PASS FILTER
Document Type and Number:
Japanese Patent JPS53134701
Kind Code:
A
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.
Inventors:
JIYOOJI TADEUTSU MIODOUSUKII
POORU MAKUDONARUDO MOOGAN
KAARU HAATSU SABUITSUTO
RII EDOWAADO SHIIMUSU
POORU MAKUDONARUDO MOOGAN
KAARU HAATSU SABUITSUTO
RII EDOWAADO SHIIMUSU
Application Number:
JP5018278A
Publication Date:
November 24, 1978
Filing Date:
April 28, 1978
Export Citation:
Assignee:
WESTERN GEOPHYSICAL CO
International Classes:
H03H7/01; G01D5/12; G01V1/16; G01V1/22; G01V1/24; G01V1/38; G08C15/00; G08C15/06; H03G3/20; H03H7/06; H03H11/04; H03H11/12; H03H19/00; H04J3/04; H04J3/10; H04L25/49; (IPC1-7): G01D5/12; G01V1/16; G08C15/00; H03H7/02; H03H11/04
Domestic Patent References:
| JPS518053B2 | 1976-03-13 | |||
| JPS51140751A | 1976-12-03 |
Previous Patent: JPS53134700
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