Dynamic range compression for variable area or wiggle trace disp

Details Dynamic range compression for variable area or wiggle trace disp Dynamic range compression for variable area or wiggle trace disp

1984-06-11

1987-02-24

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 65, 330254, G01V 100, H03G 300

Patent

active

046462759

ABSTRACT:
In a system for providing maximum display deflection within a preselected scale size for a time-varying imput whose envelope may be monotonically decreasing, or otherwise varying, automatic gain control means produces a multiplication factor by which an input signal is multiplied to provide an output signal for provision to utilization means such as a display. The multiplier signal is produced as a function of an error signal. The output signal is compared to a value indicative of a desired trace size to produce a signal representative of percentage error rather than a difference. The percentage error is subtracted from 100% to provide a gain error signal, a function of which is the multiplier signal. The function may be further generated by sampling the gain error signal over a window length and summing the samples. The integral thus obtained may be utilized as an exponent in the value of the multiplication factor.

REFERENCES:
patent: 3394315 (1968-07-01), Gray
patent: 4546326 (1985-10-01), Van Uffelen et al.

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