GB409115A - Improvements in or connected with the transmission of radio or carrier current line communications or signals - Google Patents
Improvements in or connected with the transmission of radio or carrier current line communications or signalsInfo
- Publication number
- GB409115A GB409115A GB6778/33A GB677833A GB409115A GB 409115 A GB409115 A GB 409115A GB 6778/33 A GB6778/33 A GB 6778/33A GB 677833 A GB677833 A GB 677833A GB 409115 A GB409115 A GB 409115A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- effected
- channels
- common
- signalling
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
409,115. Multiplex wireless signalling. ELWELL, C. F., 31, Felday Road, Lewisham, London, and TERMAN, F. E., 659, Salvatierra Street, Stanford University, California, U.S.A. March 6, 1933, No. 6778. Convention date, March 5, 1932. [Class 40 (v).] In a multiplex signalling system, the frequency separation between the several channels is maintained constant by providing a separate oscillator 1, 2 of comparatively low frequency for each channel, and raising the frequency in each channel by heterodyning with a separate oscillator 4 common to them all. The frequency changes occur in the modulators 5, 6 and the upper side frequency is selected by filters 7, 9. A further step-up in frequency may be effected by an oscillator 10, common to all the channels, feeding modulators 11, 12 and filters 14, 15. Signalling is effected at 16, 17 and the channels then merge in a common line or aerial 20. Heterodyning may be effected by the means described in Specifications 407,933 and 407,934.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US409115XA | 1932-03-05 | 1932-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB409115A true GB409115A (en) | 1934-04-26 |
Family
ID=21913664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6778/33A Expired GB409115A (en) | 1932-03-05 | 1933-03-06 | Improvements in or connected with the transmission of radio or carrier current line communications or signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB409115A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2458124A (en) * | 1944-11-14 | 1949-01-04 | Raymond M Wilmotte | Synchronous frequency broadcasting |
| US2589838A (en) * | 1946-06-21 | 1952-03-18 | Us Sec War | Single side band modulator |
-
1933
- 1933-03-06 GB GB6778/33A patent/GB409115A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2458124A (en) * | 1944-11-14 | 1949-01-04 | Raymond M Wilmotte | Synchronous frequency broadcasting |
| US2589838A (en) * | 1946-06-21 | 1952-03-18 | Us Sec War | Single side band modulator |
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