Device for modifying an analog electric signal
US3997845A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for modifying an analog electric signal and producing a modified analog electric signal being a pre-selectable non-linear function of the first signal comprises a plurality of amplifiers having individually variable gains. All amplifiers, possibly with exception for one amplifier, have their inputs connected to an input terminal for the signal to be modified through associated threshold circuits having individually variable threshold values, so that each amplifier operates only when the signal to be modified exceeds the threshold value of the associated threshold circuit and then provides an output signal proportional to the portion of the signal to be modified which lies above said threshold value. The output signals of the amplifiers operating at a given instant are combined into a combined signal constituting the desired modified analog signal. The device approximates the desired non-linear function between the original signal and the modified signal with a chain of successive straight line sections having different inclinations. The knee-points between these straight line sections in the approximation are selected by pre-setting the threshold values of the threshold ci…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.