公开(公告)号：NO20023346D0

公开(公告)日：2002-07-11

申请号：NO20023346

申请日：2002-07-11

Applicant: INPUT OUTPUT INC

Inventor： DOWNEY JR JOHN C ,  KRUSE RALPH ,  BISHOP ALLEN J ,  BYERLY KENT A

IPC: G01V1/22 ,  G08C15/00 ,  G01V

Abstract: A two-conductor bidirectional digital telemetry interface between a seismic sensor acquisition/conversion module and a seismic data collection module. The data collection module is configured as a master electronics device and the sensor acquisition/conversion module is configured as a slave electronics device in the telemetry system. The master device provides power to the slave device over the two conductors. The master device transmits portions of commands to the slave device at a first time and the slave device transmits portions of a digital seismic data packet to the master at a different second time in a fixed-duration frame. The frames are transmitted at regular intervals. The outbound commands and inbound data are encoded by block codes. A phase-locked loop in the slave is locked to a master clock in the master by deriving a clock and a sync point from the block-coded commands it receives from the master. The block code representing each command bit minimizes dc drift and provides a level transition in the command that can be used to maintain synchronism between master and slave.

公开(公告)号：NO993249A

公开(公告)日：1999-08-26

申请号：NO993249

申请日：1999-06-29

Applicant: INPUT OUTPUT INC

Inventor： CARROLL PAUL ELLINGTON ,  JAMES III ROY WILSON ,  BEDNAR EUGENE DAVID ,  RICE CHARLES GEOFFREY ,  BYERLY KENT A

IPC: G01V1/20 ,  G01V1/38 ,  G01V

CPC classification number: G01V1/3835 ,  G01V1/201

公开(公告)号：EP0958511A4

公开(公告)日：2004-06-09

申请号：EP98956316

申请日：1998-10-29

Applicant: INPUT OUTPUT INC

Inventor： CARROLL PAUL ELLINGTON ,  JAMES ROY WILSON III ,  BEDNAR EUGENE DAVID ,  RICE CHARLES GEOFFREY ,  BYERLY KENT A

IPC: G01V1/20 ,  G01V1/38 ,  G01V1/18

CPC classification number: G01V1/3835 ,  G01V1/201

Abstract: A seismic ocean bottom positioning device includes a series of seismic stations (14) spaced apart at a predetermined interval along a cable. Each station (14) includes a hydrophone, a motion sensing device such as a geophone (22) and an acoustic positioning circuit (24). A preamplifier is coupled to a seismic channel. The hydrophone (20) is also coupled to the seismic channel. An acoustic channel is also coupled to the preamplifier and coupled to the hydrophone.