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Method for improving signal to noise ratio

  • US 5,555,530 A
  • Filed: 12/06/1993
  • Issued: 09/10/1996
  • Est. Priority Date: 12/12/1992
  • Status: Expired due to Term
First Claim
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1. A method for improving the signal-to-noise ratio from a pair of seismic detectors which each detect a noisy signal comprising a seismic signal (S) and a noise signal (N), wherein the seismic signal (S) has a different moveout across the pair of seismic detectors from that of the noise signal (N), the noise signal (N) from a given source is detected at the first detector at a time Δ

  • t before the corresponding noise signal is detected at the second detector, and the separation of the detectors is such that the noise signal (N) detected at the second detector is substantially the same as that detected at the first detector, the method comprising delaying the noisy signal (S+N) detected at the first detector by an amount τ

    being greater than the moveout of the seismic signal but not more than Δ

    t and subtracting the delayed signal from that detected at the second detector by means of an adaptive filter so as to minimize the power in the resultant signal, yielding a representation of the seismic signal with attenuated noise level.

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