Digital Correction of linear system distortion
US4873646A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Jan 4, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/345
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An M-element waveform data sequence representative of an analog input signal during a period of interest is produced by first amplifying the input signal with a linear amplifier and periodically digitizing the amplifier output signal to produce a first data sequence having M+N-1 elements. The first N-1 elements of the first data sequence represent magnitudes of the amplifier output signal preceding the period of interest, and the remaining M elements of the first data sequence represent magnitudes of the amplifier output signal during the period of interest. The first data sequence is applied as input to a digital filter which produces an output second data sequence wherein each element of the second data sequence corresponds to an element of the first data sequence and is a linear combination of its corresponding first data sequence element and N-1 data preceding data elements of the first data sequence. The impulse response of the filter is adjusted to compensate for signal distortion caused by the amplifier. The desired M-element waveform data sequence is then obtained as the last M elements of the second data sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.