SE8903572L - WIRELESS INFORMATION TRANSFER SYSTEM - Google Patents

WIRELESS INFORMATION TRANSFER SYSTEM

Info

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
Application number
SE8903572A
Other languages
Swedish (sv)
Other versions
SE8903572D0 (en
Inventor
Goesta Rosen
Original Assignee
Goesta Rosen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Goesta Rosen filed Critical Goesta Rosen
Priority to SE8903572A priority Critical patent/SE8903572L/en
Publication of SE8903572D0 publication Critical patent/SE8903572D0/en
Priority to PCT/SE1990/000692 priority patent/WO1991007026A1/en
Priority to AU70428/91A priority patent/AU7042891A/en
Publication of SE8903572L publication Critical patent/SE8903572L/en

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).
SE8903572A 1989-10-26 1989-10-26 WIRELESS INFORMATION TRANSFER SYSTEM SE8903572L (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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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