GB468905A - Level-maintenance for television amplifiers - Google Patents
Level-maintenance for television amplifiersInfo
- Publication number
- GB468905A GB468905A GB21451/36A GB2145136A GB468905A GB 468905 A GB468905 A GB 468905A GB 21451/36 A GB21451/36 A GB 21451/36A GB 2145136 A GB2145136 A GB 2145136A GB 468905 A GB468905 A GB 468905A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- load
- signals
- aug
- diode
- 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
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
Abstract
468,905. Television. RADIOAKT.- GES. D. S. LOEWE. Aug. 4,1936, No. 21451. Convention date, Aug. 5, 1935. [Class 40 (iii)] Signal peaks (e.g. synchronizing signals) passing through a condenser 9 are used to maintain the correct level of the signals by connecting a two-electrode valve 10 across the associated leak 4, and means are provided to counteract the deleterious effect of the load 2 (e.g. a wireless transmitter). (1) The loss in correction due to the load is compensated by applying to the diode 10 a greater signal voltage than is applied from a potentiometer 12 through the coupling condenser 9 to the load 2. (2) A special steady bias is applied to the diode to assist the initiation of the current of electrons, Fig. 4 (not shown). (3) The correcting valve 10 is connected in the grid circuit of the final valve 6 instead of in the anode circuit, Fig. 5. The correcting potential may be applied to the output lead 9, when the valve 6 merely reverses the phase of the signals, Fig. 6 (not shown). Specification 462,929 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202120X | 1935-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB468905A true GB468905A (en) | 1937-07-15 |
Family
ID=5769887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21451/36A Expired GB468905A (en) | 1935-08-05 | 1936-08-04 | Level-maintenance for television amplifiers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2173497A (en) |
| BE (1) | BE416843A (en) |
| CH (1) | CH202120A (en) |
| FR (1) | FR808993A (en) |
| GB (1) | GB468905A (en) |
| NL (1) | NL48531C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2785222A (en) * | 1950-02-25 | 1957-03-12 | Emi Ltd | Circuits for the re-insertion of the direct current component in electric signals |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2543797A (en) * | 1942-05-23 | 1951-03-06 | Irving H Page | Radio amplifier circuits |
| US2468087A (en) * | 1943-01-29 | 1949-04-26 | Int Standard Electric Corp | Thermionic valve circuits |
| US2418480A (en) * | 1944-05-24 | 1947-04-08 | Arthur C Prichard | Asymmetrically conducting network |
| US2471246A (en) * | 1944-05-25 | 1949-05-24 | Rca Corp | Electronic apparatus |
| US2599287A (en) * | 1950-05-23 | 1952-06-03 | Gen Electric | Wide frequency range power-factor meter |
| US2911464A (en) * | 1955-11-16 | 1959-11-03 | Muirhead & Co Ltd | Facsimile telegraph systems |
| US3396236A (en) * | 1965-06-07 | 1968-08-06 | Fairchild Camera Instr Co | Automatic black-level control circuit |
-
0
- BE BE416843D patent/BE416843A/xx unknown
- NL NL48531D patent/NL48531C/xx active
-
1936
- 1936-07-30 CH CH202120D patent/CH202120A/en unknown
- 1936-08-04 GB GB21451/36A patent/GB468905A/en not_active Expired
- 1936-08-04 US US94130A patent/US2173497A/en not_active Expired - Lifetime
- 1936-08-04 FR FR808993D patent/FR808993A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2785222A (en) * | 1950-02-25 | 1957-03-12 | Emi Ltd | Circuits for the re-insertion of the direct current component in electric signals |
Also Published As
| Publication number | Publication date |
|---|---|
| FR808993A (en) | 1937-02-19 |
| BE416843A (en) | |
| US2173497A (en) | 1939-09-19 |
| CH202120A (en) | 1938-12-31 |
| NL48531C (en) |
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