JPS56501665A - - Google Patents
Info
- Publication number
- JPS56501665A JPS56501665A JP50202379A JP50202379A JPS56501665A JP S56501665 A JPS56501665 A JP S56501665A JP 50202379 A JP50202379 A JP 50202379A JP 50202379 A JP50202379 A JP 50202379A JP S56501665 A JPS56501665 A JP S56501665A
- Authority
- JP
- Japan
- Legal status (The legal status 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 status listed.)
- Pending
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
- H04B10/1143—Bidirectional transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/725—Cordless telephones
- H04M1/737—Characterised by transmission of electromagnetic waves other than radio waves, e.g. infrared waves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DE1979/000138 WO1981001491A1 (en) | 1979-11-22 | 1979-11-22 | Subscriber telephone station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56501665A true JPS56501665A (en) | 1981-11-12 |
Family
ID=6699869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50202379A Pending JPS56501665A (en) | 1979-11-22 | 1979-11-22 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS56501665A (en) |
| WO (1) | WO1981001491A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610947A (en) * | 1994-10-14 | 1997-03-11 | International Business Machines Corporation | IR FM modem with flash modulation |
| JP2863990B2 (en) * | 1994-11-30 | 1999-03-03 | 株式会社ユニトロン | Infrared wireless microphone |
Family Cites Families (6)
| 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 |
| DE2609283A1 (en) * | 1976-02-04 | 1977-08-18 | Franz Osterholzer | Telephone handset linked to terminal by I:R transmission - has switchable volume control and dialling keyboard |
| DE2604652A1 (en) * | 1976-02-04 | 1977-08-11 | Franz Osterholzer | Infra:red telephone handset - replaces wires by linking handset to terminal with infra:red transmission device |
| GB1548145A (en) * | 1978-02-21 | 1979-07-04 | Standard Telephones Cables Ltd | Telephones |
| DE2823931A1 (en) * | 1978-05-31 | 1979-12-06 | Siemens Ag | Telephone subscriber's appts. using PPM IR radiation - transmits voice signals from handset to main unit connected to telephone line obviating extension wires |
| DE2832374B1 (en) * | 1978-07-24 | 1979-10-18 | Telefonbau & Normalzeit Gmbh | Method for operating a hands-free device connected to a telephone connection |
-
1979
- 1979-11-22 JP JP50202379A patent/JPS56501665A/ja active Pending
- 1979-11-22 WO PCT/DE1979/000138 patent/WO1981001491A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1981001491A1 (en) | 1981-05-28 |