Seismic system with signal-to-noise determination

Details Seismic system with signal-to-noise determination Seismic system with signal-to-noise determination

1976-03-24

1977-06-21

Birmiel, Howard A.

Communications: electrical

Selective

Having electron beam device

340 155A, 340 155GC, 238 92SH, 328135, 328148, 307351, 307352, G01V 128

Patent

active

040315053

ABSTRACT:
An improvement to a seismic system, which provides data words, having digital signals corresponding to sensed vibrations in an earth formation or to noise occurring in a seismic system, permits the determination of the signal to noise ratio of the seismic system in the field. The improvement comprises a new word register receiving the data word signals from the seismic system, an H register and an L register. The improvement also includes control circuits and comparators whereby the comparators and the registers are controlled so that the data word is periodically entered into a new word register and the signals provided by the new word register is compared with signals provided by the H register and the L register so that after one cycle of operation, the most positive data word occurring during the cycle is stored in either the H or L register while the most negative data word occurring is stored in the remaining register of the H and L registers. A digital subtractor subtracts the H and L register contents from each other to provide an output corresponding to the absolute difference between the words stored in the H and L register. A logic network provides digital signals corresponding to the signal to noise ratio in decibels. A visual display is provided of the signal to noise ratio.

REFERENCES:
patent: 3506813 (1970-04-01), Trimble
patent: 3585507 (1971-06-01), Bickel
patent: 3789306 (1974-01-01), Hammerschlag

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