| 摘要 |
1526055 Processing seismograms DEUTSCHE TEXACO AG 3 Oct 1975 [9 Oct 1974] 40625/75 Heading G1G Suppression of harmonics in seismograms is obtained by generating a series of phase-displaced seismograms in response to respective phase displaced up-swept or down-swept vibrator signals, phase shifting the seismograms after Fourier transform, and adding them, genuine signals reinforcing, harmonics cancelling. |
