Inverse hyperbolic comb filter
US5270803A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Oct 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An inverse hyperbolic comb filter decodes an encoded signal by subtracting a vertically filtered and horizontally filtered version of the encoded signal from a delayed version of the encoded signal whereupon the resulting output is further horizontally filtered to provide a first decoded output. A twice delayed version of the input signal then has the first output signal subtracted therefrom to provide a second output. Optional further vertical filtering may be employed to vertically filter the output of the first subtractor before the final horizontal filtering is performed. The filter may also be employed in encoding signals wherein the components to be encoded are first filtered prior to combining. The inverse hyperbolic comb filter is applicable to any system employing combining of two-dimensional signals via quadrature modulation and may also be employed in three-dimensional systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.