SE8903572L - WIRELESS INFORMATION TRANSFER SYSTEM - Google Patents
WIRELESS INFORMATION TRANSFER SYSTEMInfo
- Publication number
- SE8903572L SE8903572L SE8903572A SE8903572A SE8903572L SE 8903572 L SE8903572 L SE 8903572L SE 8903572 A SE8903572 A SE 8903572A SE 8903572 A SE8903572 A SE 8903572A SE 8903572 L SE8903572 L SE 8903572L
- Authority
- SE
- Sweden
- Prior art keywords
- light
- unit
- intended
- frequency
- change
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/1149—Arrangements for indoor wireless networking of information
Landscapes
- Engineering & Computer Science (AREA)
- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to a cordless communication system for the transmission of information between at least two units (1, 2), of which one unit (1) is equipped with one or more light-emitting diodes (3), preferably diodes adapted to generate infrared light (IR-light), and the other unit (2) is equipped with one or more photodetectors (5), preferably adapted to receive IR-light. One of the units also includes means for modulating the light generated by the light-emitting diodes in dependence on the desired information content, and the other unit is provided with means for interpreting the received modulated light signal in order to obtain the prevailing information content. The means of one unit (1) is intended to form, via respective diodes (3), a light change which corresponds to a continuous function. The modulation for information transmission conforms to the principles of frequency modulation and/or amplitude modulation, and the means of the other unit (2) evaluates the prevailing light change and/or frequency change. Each unit (1) includes a switch device (8c) which is able to alternate frequencies, one frequency being intended for internal communication (1, 2) and one intended for external communication (1, 1' and 1, 2' respectively).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8903572A SE8903572L (en) | 1989-10-26 | 1989-10-26 | WIRELESS INFORMATION TRANSFER SYSTEM |
PCT/SE1990/000692 WO1991007026A1 (en) | 1989-10-26 | 1990-10-25 | Cordless communication system |
AU70428/91A AU7042891A (en) | 1989-10-26 | 1990-10-25 | Cordless communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8903572A SE8903572L (en) | 1989-10-26 | 1989-10-26 | WIRELESS INFORMATION TRANSFER SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8903572D0 SE8903572D0 (en) | 1989-10-26 |
SE8903572L true SE8903572L (en) | 1991-04-27 |
Family
ID=20377294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8903572A SE8903572L (en) | 1989-10-26 | 1989-10-26 | WIRELESS INFORMATION TRANSFER SYSTEM |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7042891A (en) |
SE (1) | SE8903572L (en) |
WO (1) | WO1991007026A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779493A (en) * | 1993-06-18 | 1995-03-20 | Sony Corp | Infrared ray signal receiver |
JP2863990B2 (en) * | 1994-11-30 | 1999-03-03 | 株式会社ユニトロン | Infrared wireless microphone |
WO2000001096A1 (en) * | 1998-06-29 | 2000-01-06 | Eclipse Concepts Limited | Infrared communication system for simulated wargame |
JP2006527559A (en) | 2003-06-10 | 2006-11-30 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | LED system with illumination and data transmission |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2431937C2 (en) * | 1974-07-03 | 1982-04-01 | Sennheiser Electronic Kg, 3002 Wedemark | Method for wireless optical communication |
DE2559646B2 (en) * | 1975-08-02 | 1978-12-14 | Neumann Elektronik Gmbh, 4330 Muelheim | Device for the transmission of audio-frequency messages in buildings and vehicles |
DE2837907C3 (en) * | 1978-08-31 | 1981-06-25 | Sennheiser Electronic Kg, 3002 Wedemark | Method for the transmission of low-frequency signals |
DE2920208A1 (en) * | 1979-05-18 | 1980-11-27 | Oticon Electronics As | Modulated light signals receiver - has parallel control circuits for input photodiode and load resistance for interference protection |
US4456793A (en) * | 1982-06-09 | 1984-06-26 | Bell Telephone Laboratories, Incorporated | Cordless telephone system |
JPS6081306A (en) * | 1983-10-07 | 1985-05-09 | 日本碍子株式会社 | Working helmet |
US4727600A (en) * | 1985-02-15 | 1988-02-23 | Emik Avakian | Infrared data communication system |
DE3607885A1 (en) * | 1986-03-10 | 1987-09-17 | Precitronic | Intercom device |
US4882770A (en) * | 1987-12-14 | 1989-11-21 | H. M. Electronics, Inc. | Wireless optical communication system |
-
1989
- 1989-10-26 SE SE8903572A patent/SE8903572L/en not_active Application Discontinuation
-
1990
- 1990-10-25 AU AU70428/91A patent/AU7042891A/en not_active Abandoned
- 1990-10-25 WO PCT/SE1990/000692 patent/WO1991007026A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
AU7042891A (en) | 1991-05-31 |
WO1991007026A1 (en) | 1991-05-16 |
SE8903572D0 (en) | 1989-10-26 |
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Legal Events
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NAV | Patent application has lapsed |
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