SP noise cancellation technique
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United States of America Patent
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-
Jul 20, 1993
Grant Date -
N/A
app pub date -
May 8, 1991
filing date -
May 8, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An adaptive transversal filter is incorporated with an SP conductor extending through a logging cable to the surface from an SP electrode supported on a sonde. This logging cable is operated in a noisy environment and there is the risk of noise on the logging cable obscuring the SP signal. The SP signal is obtained at the surface and is passed through a filter system. One input to the filter system utilizes an AC ammeter connected to the AC power source for the logging cable and that signal is input to a multi-stage adaptive transversal filter. The filter output is a recreation of the noise imposed on the SP conductor and when summed with the SP output signal, provides a signal which is substantially noise free.
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