GB332834A - - Google Patents
Info
- Publication number
- GB332834A GB332834A GB31336/29A GB3133629A GB332834A GB 332834 A GB332834 A GB 332834A GB 31336/29 A GB31336/29 A GB 31336/29A GB 3133629 A GB3133629 A GB 3133629A GB 332834 A GB332834 A GB 332834A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- generator
- auxiliary
- transformer
- relay
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Radio Relay Systems (AREA)
- Superheterodyne Receivers (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
332,834. Telefunken Ges. fiir Drahtlose Telegraphie. Oct. 15, 1928, [Convention date]. Thermionic homodyne receivers.-An auxiliary frequency, such as is used for example to effect automatic gain control, is made to serve the further purpose of synchronizing the frequency of a local oscillator employed at the receiving end to re-introduce a suppressed carrier wave. The homodyne generator 3 is coupled to the receiving amplifier and rectifier 2. The auxiliary frequency is accepted by a filter 5 and is fed to two amplifiers 8, 9 in push-pull through a transformer 6, and simultaneously in parallel through a transformer 7. The circuit 6, 10 is tuned to the auxiliary transmitted frequency, so that if the local frequency supplied by the generator 3 is the same as that transmitted, the voltages applied to the grids of the valves 8, 9 by the transformers 6, 7 will be 90‹ out of phase, the plate currents from both valves will be equal, and a relay 11 remains unaffected. If the two frequencies are different, however, the relay 11 is operated to place a positive or negative bias on the grid of a valve 12, which, in turn, detunes the circuits of the generator 3 until exact synchronism is attained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET35820D DE509946C (en) | 1928-10-16 | 1928-10-16 | Receiving arrangement with carrier wave addition by means of a local generator automatically regulated in frequency |
| DE341766X | 1929-03-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB332834A true GB332834A (en) | 1930-07-31 |
Family
ID=25821141
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31336/29A Expired GB332834A (en) | 1928-10-16 | 1929-10-15 | |
| GB7405/30A Expired GB341766A (en) | 1928-10-16 | 1930-03-06 | Improvements in or relating to radio and similar high frequency communication systems |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7405/30A Expired GB341766A (en) | 1928-10-16 | 1930-03-06 | Improvements in or relating to radio and similar high frequency communication systems |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1917395A (en) |
| DE (1) | DE509946C (en) |
| FR (2) | FR683292A (en) |
| GB (2) | GB332834A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2462630A (en) * | 1945-02-28 | 1949-02-22 | Honeywell Regulator Co | Phase-sensitive self-balancing frequency meter |
| DE872969C (en) * | 1951-01-13 | 1953-04-09 | Siemens Ag | Method for reducing fading in wireless single sideband transmissions |
| US2871349A (en) * | 1954-07-14 | 1959-01-27 | Jonas M Shapiro | Discriminator circuit |
| US3101448A (en) * | 1954-12-23 | 1963-08-20 | Gen Electric | Synchronous detector system |
| FR2526554B1 (en) * | 1982-05-06 | 1985-06-07 | Telecommunications Sa | METHOD FOR REGULATING LUMINOUS INFORMATION TRANSMITTERS AND THE IMPLEMENTING SYSTEM |
-
1928
- 1928-10-16 DE DET35820D patent/DE509946C/en not_active Expired
-
1929
- 1929-10-02 US US396895A patent/US1917395A/en not_active Expired - Lifetime
- 1929-10-15 FR FR683292D patent/FR683292A/en not_active Expired
- 1929-10-15 GB GB31336/29A patent/GB332834A/en not_active Expired
-
1930
- 1930-01-24 FR FR37916D patent/FR37916E/en not_active Expired
- 1930-03-06 GB GB7405/30A patent/GB341766A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB341766A (en) | 1931-01-22 |
| FR37916E (en) | 1931-02-07 |
| DE509946C (en) | 1930-10-14 |
| US1917395A (en) | 1933-07-11 |
| FR683292A (en) | 1930-06-10 |
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