Analog to digital conversion system that enables high-level signal excursions without clipping
US6195029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/1235
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for combining analog and digital processing techniques to thereby capture a much wider dynamic range of an original input signal than an A/D converter can by itself, to thereby preserve a maximum amount of information from the original input signal, wherein a processing amplifier combines a level-dependent, soft logarithmic limiting function with a high-frequency pre-emphasis filter, such that the pre-emphasis helps to compensate for a disproportionate reduction of high frequency information when portions of the signal are in an overload region, and wherein digital de-emphasis of the digitized signal enables recovery of the dynamic range that was sacrificed to create the overload region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.