Portable device using inductive antenna to receive data transmitted via modulating vertical or horizonal line synchronization signals of a swept frame video display monitor
US5978656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/44
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Data transmission system comprising a data transmitter (1) including: PA1 swept frame display means (2), and PA1 a generator of composite video signals (20, 22) to control the operation of said swept frame display means (2); and a portable information detection device (7) for receiving said transmitted data by said data transmitter (1). The data transmitter (1) further comprises means (23) for modulating at least one of the elementary signals constituting said composite video signals with the data to be transmitted, and said information detection device (7) further comprises any inductive antenna (44, 45) for detecting said modulated elementary signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.