System for recording and processing seismic reflection signals
First Claim
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1. A method of processing seismic reflection signals, comprising the steps of:
- (a) recording a plurality of seismic reflection signals in a plurality of recording channels,(b) amplifying the seismic reflection signals in each recording channel by a given number of units of amplification,(c) converting each amplified seismic signal into a plurality of digital samples,(d) producing a first signal representing the number of units of amplification applied to the seismic reflection signals, said first signal being represented by a plurality of digital bits,(e) producing a second signal representing a desired scale factor to be applied to the seismic reflection signals, said second signal being represented by a plurality of digital bits,(f) producing a third signal identifying the combined count represented by the digital bits of said first and second signals, and(g) shifting said digital samples by the number of bit positions represented by said third signal.
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Abstract
A seismic recording system employs amplifiers, a multiplexer, and an analog-to-digital converter for converting analog seismic reflection signals obtained during seismic exploration operations to a serial output of multiplexed digital samples. An input controller restores to the digital samples the original amplitude of the seismic signals as they were received by the field recorder and scales the digital samples for later compositing into a seismic record in a central processing unit. An output controller then applies to each digital sample in the composite record a desired gain prior to recording on a magnetic tape unit.
17 Citations
9 Claims
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1. A method of processing seismic reflection signals, comprising the steps of:
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(a) recording a plurality of seismic reflection signals in a plurality of recording channels, (b) amplifying the seismic reflection signals in each recording channel by a given number of units of amplification, (c) converting each amplified seismic signal into a plurality of digital samples, (d) producing a first signal representing the number of units of amplification applied to the seismic reflection signals, said first signal being represented by a plurality of digital bits, (e) producing a second signal representing a desired scale factor to be applied to the seismic reflection signals, said second signal being represented by a plurality of digital bits, (f) producing a third signal identifying the combined count represented by the digital bits of said first and second signals, and (g) shifting said digital samples by the number of bit positions represented by said third signal. - View Dependent Claims (2, 3, 4, 5)
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6. In a seismic exploration system having a source of seismic energy, a plurality of receivers for detecting seismic reflection signals, and a recorder for amplifying and converting each seismic reflection signal to a plurality of digital samples, the improvement comprising:
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(a) means for producing a first signal having a plurality of digital bits representing the units of amplification applied to each seismic signal in the recorder, (b) means for producing a second signal having a plurality of digital bits representing a desired scale factor to be applied to each seismic signal, (c) means for producing a third signal having a plurality of digital bits indentifying the combined count represented by the digital bits of said first and second signals, and (d) means for shifting the digital samples for each seismic signal the number of bit positions represented by said third signal. - View Dependent Claims (7, 8, 9)
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Specification