Dynamic range compression for variable area or wiggle trace display method and apparatus
US4646275A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Jun 11, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.