GB1473640A - Inductive signalling arrangements - Google Patents
Inductive signalling arrangementsInfo
- Publication number
- GB1473640A GB1473640A GB1351673A GB1351673A GB1473640A GB 1473640 A GB1473640 A GB 1473640A GB 1351673 A GB1351673 A GB 1351673A GB 1351673 A GB1351673 A GB 1351673A GB 1473640 A GB1473640 A GB 1473640A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inductive
- loop
- desk
- source
- loops
- Prior art date
- 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.)
- Expired
Links
- 230000001939 inductive effect Effects 0.000 title abstract 6
- 230000011664 signaling Effects 0.000 title abstract 3
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electrically Operated Instructional Devices (AREA)
Abstract
1473640 Inductive signalling COVENTRY CITY COUNCIL 20 June 1974 [21 March 1973] 13516/73 Heading H4U In an inductive signalling system, e.g. for teaching purposes, receiver units are provided on a desk or table for selecting a desired source of a plurality of signal sources such as tapes carrying recorded instructional material, at least one inductive loop under a corresponding desk or table top being provided, a pick up coil of the receiver responding to the source signals transmitted by the loop(s). As described, desks in a classroom are each provided with an inductive loop and a switching arrangement coupled to a plurality of tape recorders enables the desired signal source to be selected and the remaining signals to be by-passed so that they are available for connection to the other inductive loops. Alternatively, the switching is dispensed with and each desk top carries a plurality of separate transmitting loops each connected to a different tape recorder, the receiving unit being selectively placed on the desk top to co-operate with the required loop.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1351673A GB1473640A (en) | 1974-06-20 | 1974-06-20 | Inductive signalling arrangements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1351673A GB1473640A (en) | 1974-06-20 | 1974-06-20 | Inductive signalling arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1473640A true GB1473640A (en) | 1977-05-18 |
Family
ID=10024401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1351673A Expired GB1473640A (en) | 1974-06-20 | 1974-06-20 | Inductive signalling arrangements |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1473640A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138657A (en) * | 1983-04-22 | 1984-10-24 | Stephen John Irwin | Near Field Signalling System |
GB2178617A (en) * | 1985-07-23 | 1987-02-11 | Recoton Corp | Tv stereo adaptor |
US4750206A (en) * | 1986-10-28 | 1988-06-07 | Recoton Corporation | Adapter for TV stereo, SAP and auxiliary signals |
GB2258358A (en) * | 1991-08-02 | 1993-02-03 | Teleste Cablevision Limited | Control of tv accessory in dependence on detected tv radiation or field. |
CN113470444A (en) * | 2021-04-07 | 2021-10-01 | 顺德职业技术学院 | Teaching platform desktop |
-
1974
- 1974-06-20 GB GB1351673A patent/GB1473640A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138657A (en) * | 1983-04-22 | 1984-10-24 | Stephen John Irwin | Near Field Signalling System |
GB2178617A (en) * | 1985-07-23 | 1987-02-11 | Recoton Corp | Tv stereo adaptor |
GB2178617B (en) * | 1985-07-23 | 1989-08-09 | Recoton Corp | Tv stereo adaptor |
US4750206A (en) * | 1986-10-28 | 1988-06-07 | Recoton Corporation | Adapter for TV stereo, SAP and auxiliary signals |
GB2258358A (en) * | 1991-08-02 | 1993-02-03 | Teleste Cablevision Limited | Control of tv accessory in dependence on detected tv radiation or field. |
GB2258358B (en) * | 1991-08-02 | 1995-05-17 | Teleste Cablevision Limited | Improvements relating to television accessory units |
CN113470444A (en) * | 2021-04-07 | 2021-10-01 | 顺德职业技术学院 | Teaching platform desktop |
CN113470444B (en) * | 2021-04-07 | 2023-07-28 | 顺德职业技术学院 | Teaching platform desktop |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |