Dynamic range compression for variable area or wiggle trace display method and apparatus
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United States of America Patent
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Feb 24, 1987
Grant Date -
N/A
app pub date -
Jun 11, 1984
filing date -
Jun 11, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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