Bandwidth enhancing seismic acquisition system and method
US4875166A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1987 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Oct 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/364
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low-cut filter is provided which has a frequency response with its low frequency end attenuation limited. The low-cut filter 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 amplified the low-amplitude high-frequency end of the spectrum resulting in increased effective bandwidth. A high frequency boost filter 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 is provided in the system's input stage in order to keep its effect on system input noise to a minimum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.