Charles A Bowen

Address:

141 Sycamore Ln, Louisa, KY 41230

Phone:

6066733305

VIN:

WAUSF78K09N033096

Make:

AUDI

Model:

A4

Year:

2009

US Patent:

48751669, Oct 17, 1989

Filed:

Oct 9, 1987

Appl. No.:

7/107500

Inventors:

Paul E. Carroll - Houston TX
Roy W. James - Houston TX
Charles K. Bowen - Richmond TX
Gillan C. Smith - Houston TX

Assignee:

Input/Output, Inc. - Stafford TX

International Classification:

G06C 748

US Classification:

364421

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.