| 摘要 |
23 ABSTRACR MEMOD FOR WAVELET DENOISING OF CCNTROLLED SOURCE ELECI'FU4AGNETIC SURVEY DATA METHOD FOR DENOISING A RECEIVER SIGNAL FROM A CONTROLLED SOURCE ELECTROMAGNETIC SURVEY. A DISCRETE WAVELET TRANSFORM IS PERFORMED ON THE SIGNAL, AND THE RESULTING DETAIL COEFFICIENTS ARE TRUNCATED USING A SELECTED THRESHOLD VALUE, WHICH MAY BE ZERO. FURTHER LEVELS OF DECOMPOSITION MAY BE PERFORMED ON THE 5 APPROXIMATION COEFFICIENTS FROM THE PRECEDING LEVEL. AFTER THE FINAL LEVEL OF DECOMPOSITION, A DENOISED SIGNAL IS RESTRUCTURED BY PERFORMING THE INVERSE WAVELET TRANSFORMATION ON THE LAST SET OF APPROXIMATION COEFFICIENTS COMBINED WITH THE THRESHOLDED DETAIL COEFFICIENTS ACCUMULATED FROM ALL LEVELS OF DECOMPOSITION. 10 @00(@ 502
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