GB484202A - Improvements in or relating to television systems - Google Patents
Improvements in or relating to television systemsInfo
- Publication number
- GB484202A GB484202A GB2647436A GB2647436A GB484202A GB 484202 A GB484202 A GB 484202A GB 2647436 A GB2647436 A GB 2647436A GB 2647436 A GB2647436 A GB 2647436A GB 484202 A GB484202 A GB 484202A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- resistance
- synchronizing impulses
- condenser
- 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
- 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
-
- 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
- H04N5/53—Keyed automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
484,202. Valve circuits for wireless reception. KALLMANN, H. E., and SPENCER, R. E. Sept. 30, 1936, No. 26474. [Class 40 (v)] A.V.C. voltages are derived from a television signal by displacing the synchronizing impulses so that the minimum amplitude of the resulting signal corresponds to minimum vision modulation and deriving a voltage corresponding to said minimum amplitude. The complete signal from the cathode resistance 21 of a V.F. amplifier 11 is applied through condenser 23 to the grid 26 of a valve 27 and also through resistance 31 to the grid 36 of valve 37. The valve 27 produces phase reversed synchronizing impulses at its anode which are applied through condenser 29 to the grid of valve 37 where they more than balance out the synchronizing impulses fed through resistance 31. Gain controlling voltage is taken from the cathode of valve 37 through filter 51, 53, 55, a diode 48, 49 being provided to prevent the production of positive control voltage. D.C. insertion may be provided in valve 27 by the method described in Specification 422,906.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL56592D NL56592C (en) | 1936-09-30 | ||
GB2647436A GB484202A (en) | 1936-09-30 | 1936-09-30 | Improvements in or relating to television systems |
FR827382D FR827382A (en) | 1936-09-30 | 1937-09-30 | Improvements to television systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2647436A GB484202A (en) | 1936-09-30 | 1936-09-30 | Improvements in or relating to television systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB484202A true GB484202A (en) | 1938-05-02 |
Family
ID=10244209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2647436A Expired GB484202A (en) | 1936-09-30 | 1936-09-30 | Improvements in or relating to television systems |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR827382A (en) |
GB (1) | GB484202A (en) |
NL (1) | NL56592C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1010561B (en) * | 1953-10-27 | 1957-06-19 | Emi Ltd | Circuit arrangement for deriving a control voltage in television receivers |
-
0
- NL NL56592D patent/NL56592C/xx active
-
1936
- 1936-09-30 GB GB2647436A patent/GB484202A/en not_active Expired
-
1937
- 1937-09-30 FR FR827382D patent/FR827382A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1010561B (en) * | 1953-10-27 | 1957-06-19 | Emi Ltd | Circuit arrangement for deriving a control voltage in television receivers |
Also Published As
Publication number | Publication date |
---|---|
NL56592C (en) | |
FR827382A (en) | 1938-04-25 |
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