公开(公告)号：CA1313565C

公开(公告)日：1993-02-09

申请号：CA578456

申请日：1988-09-26

Applicant: INPUT OUTPUT INC

Inventor： CARROLL PAUL E ,  JAMES ROY W III ,  BOWEN CHARLES K ,  SMITH GILLAN C

IPC: G01V1/24 ,  G01V1/28 ,  G01V1/36

Abstract: BANDWIDTH ENHANCING SEISMIC ACQUISITION SYSTEM AND METHOD An improved geophysical data acquisition system is disclosed for enhancing effective system bandwidth of a seismic signal having an amplitude frequency spectrum characterized by high amplitude low frequencies and low amplitude high frequencies. A low-cut filter (35) is provided which has a frequency response with its low frequency end attenuation limited. The low-cut filter (35) has the effect of increasing effective channel bandwidth while simultaneously allowing low frequency signals from deep within the earth to be included in the output signal. Effective channel bandwidth is increased because low frequency seismic signals are attenuated, automatically allowing channel gain to be increased by a gain ranging amplifier. Increased channel gain automatically amplifies the low-amplitude high-frequency end of the spectrum resulting in increased effective bandwidth. A high frequency boost filter (30) is provided whereby the high frequency signal components of the seismic signals may be further relatively amplified thereby enhancing the channel effective bandwidth. The boost filter (30) is provided in the system's input stage in order to keep its effect on system input noise to a minimum.

公开(公告)号：AU584061B2

公开(公告)日：1989-05-11

申请号：AU7120887

申请日：1987-02-11

Applicant: INPUT OUTPUT INC

Inventor： ABRAMS MICHAEL LEE ,  RICE CHARLES GEOFRREY ,  CARROLL PAUL E ,  JAMES ROY WILSON III

IPC: G01V1/28 ,  G01V1/36

Abstract: The system for suppressing an ambient noise signal which comtaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the detected noise signal into noise data. A reference noise generator converts the noise data into a reference noise signal. The noise generator automatically adjusts the reference noise signal to correspond with changes in the noise signal as it is being detected. A filter filters the reference noise signal into an error signal which is adapted to remove the noise signal from the contaminated signal. A cross-correlator cross-correlates the contaminated signal with the reference noise signal and adjusts the filter to produce the required error signal.

公开(公告)号：DE3888203T2

公开(公告)日：1994-09-29

申请号：DE3888203

申请日：1988-10-03

Applicant: INPUT OUTPUT INC

Inventor： CARROLL PAUL E ,  JAMES ROY ,  BOWEN CHARLES K ,  SMITH GILLAN C

IPC: G01V1/24 ,  G01V1/28 ,  G01V1/36

公开(公告)号：DE3888203D1

公开(公告)日：1994-04-07

申请号：DE3888203

申请日：1988-10-03

Applicant: INPUT OUTPUT INC

Inventor： CARROLL PAUL E ,  JAMES ROY ,  BOWEN CHARLES K ,  SMITH GILLAN C

IPC: G01V1/24 ,  G01V1/28 ,  G01V1/36

公开(公告)号：AU7120887A

公开(公告)日：1987-09-28

申请号：AU7120887

申请日：1987-02-11

Applicant: INPUT OUTPUT INC

Inventor： ABRAMS MICHAEL LEE ,  RICE CHARLES GEOFFREY ,  CARROLL PAUL E ,  JAMES ROY WILSON III

IPC: G01V1/28 ,  G01V1/36

Abstract: The system for suppressing an ambient noise signal which comtaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the detected noise signal into noise data. A reference noise generator converts the noise data into a reference noise signal. The noise generator automatically adjusts the reference noise signal to correspond with changes in the noise signal as it is being detected. A filter filters the reference noise signal into an error signal which is adapted to remove the noise signal from the contaminated signal. A cross-correlator cross-correlates the contaminated signal with the reference noise signal and adjusts the filter to produce the required error signal.

公开(公告)号：CA1260131A

公开(公告)日：1989-09-26

申请号：CA530180

申请日：1987-02-20

Applicant: INPUT OUTPUT INC

Inventor： ABRAMS MICHAEL L ,  RICE CHARLES G ,  CARROLL PAUL E ,  JAMES ROY W III

IPC: G01V1/28 ,  G01V1/36

Abstract: TITLE: NOISE SUPPRESSION DURING SEISMIC EXPLORATION The system for suppressing an ambient noise signal which contaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the detected noise signal into noise data. A reference noise generator converts the noise data into a reference noise signal. The noise generator automatically adjusts the reference noise signal to correspond with changes in the noise signal as it is being detected. A filter filters the reference noise signal into an error signal which is adapted to remove the noise signal from the contaminated signal. A cross-correlator cross-correlates the contaminated signal with the reference noise signal and adjusts the filter to produce the required error signal.