The effects of digitization on the dynamic range of Vibroseis signals /
(i.e., many signals must be averaged) is required to control
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (i.e., many signals must be averaged) is required to control 1/0 relation approximated a straight line provided that the 4, 2, and 1 bit on: 1) the dynamic range, 2) the S/N ratio, acceptable results compared with the 16-bit digitization. also showed that they acted like noise for each other which amplitudes of -54 dB relative to the primary signals were and 3) the input/output relationship were investigated. The and/or in the presence of large noise. bits increased. In the presence of gaussian noise however, bits than required to achieve the desired dynamic range. The by the numbers of bits used in the digitization. However, for delectability. However, these two properties were reduced as digitization of Vibroseis signals showed comparable and drastically reduced the digitization distortion of both effects of digitization of Vibroseis signals using 16, 8, 6, function of the sweep duration (number of samples), the generating the fmal seismic section. Therefore, it is not Hence, the recording instruments need not utilize more binary improved. The input/output (I/O) relation changed from a increased the dynamic range and the small-signal individual samples of a redundant signal are combined in instruments to measure a small signal accurately in the it is shown that, for sign-bit and 2-bit digitizations, the nature of degradation of the digitized Vibroseis signals necessary to have the full dynamic range and precision in the noise standard deviation is larger than the signal (i.e., non-redundant signals, the dynamic range is directly affected number of (fixed) source repetitions, and the number of presence of a large signal or in the presence of noise. For raw data to achieve the desired quality of the final section. recovered in the presence of another strong signal (primary) redundunt signals such as Vibroseis, the dynamic range is a requires sufficient dynamic range in the recording S/N<I.O) because noise provided a background that randomized signals which occurs in the absence of noise. The 8-bit stair-step like (nonlinear) to a sight line as the number of the amount of noise present. Overlapping Vibroseis signals The detection of geologic reflectors in seismic signals the digitization distortion. However, sufficient redundancy the number of bits was decreased. The S/N ratio was also traces in a common-depth point (CDP) stacking because the varied with the number of bits used. The Vibroseis method With an 8-bit digitizes, small Vibroseis signals with |
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| Item Description: | "Major subject: Geophysics". In title, symbols are used. Vita. |
| Physical Description: | xi, 61 leaves : illustrations ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references. |