Facsimile communication with an active addressing display device
US5459482A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1993 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jun 24, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A selective call signaling system (10) capable of facsimile communication with a selective call receiver (40) having an active addressing display (100) comprising picture elements (pixels) (108) controlled by a plurality of first and second electrodes (106, 104). A data compressor (12) compresses the data. A transmitter (30) transmits the compressed data organized in frames to the selective call receiver (40). The selective call receiver (40) comprises a receiver (60) receiving the compressed data; the active addressing display (100) displaying the compressed data. The active addressing display (200) comprises a controller (500) controlling the plurality first electrodes (106) by a plurality of periodic first drive signals (400) represented as a sequency ordered Walsh Hadamard transform (WHT) matrix (300) and the plurality of second electrodes (104) by a plurality of second drive signals responsive to the compressed data. A processor (510) calculates the plurality of second drive signals directly from the compressed data and identifies a plurality of hierarchical tree structures (FIG. 11 ) corresponding to the WHT matrix (300) for processing the frames of compressed data directly w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.