Data compression system
US4777620A · kind A · utility
69Cited by
14References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1985 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | Feb 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data compression-expansion (decrease-increase) method for improving the signal-to-noise ratio of compressed-expanded data while retaining the fidelity of the original data comprises the steps of using a filter that can be separated into a smoothing portion and an enhancing portion. The selected filter is separated into the two portions: a first portion for smoothing prior to decreasing the data, and a second portion for enhancing after increasing the data whereby the filter has the maximal effect of decreasing noise while having a minimal effect on the data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.