GB464553A - Stabilisation of television amplifiers - Google Patents
Stabilisation of television amplifiersInfo
- Publication number
- GB464553A GB464553A GB20555/36A GB2055536A GB464553A GB 464553 A GB464553 A GB 464553A GB 20555/36 A GB20555/36 A GB 20555/36A GB 2055536 A GB2055536 A GB 2055536A GB 464553 A GB464553 A GB 464553A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- valves
- picture
- amplifier
- resistance
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
464,553. Valve amplifying circuits. RADIOAKT.-GES. D. S. LOEWE. July 24, 1936, No. 20555. Convention date, July 25, 1935. [Class 40 (v)] In order to prevent picture flicker in a television system the amplifier for the picture signals is compensated against back coupling due to the impedance of the supply source. As shown, the amplifier comprises a preliminary stage 3 coupled to the photo-cell 2 followed by a chain of resistance-capacity coupled amplifiers, the whole being supplied with anode current from a mains rectifier 6 and smoother 7, 33. The output stage 5 of the amplifier is coupled through a potential-divider 16 to a compensating valve 13, the arrangement being such that the anode variations of the valve 13 are equal in amplitude but opposite in phase to those of the valve 5. Under these conditions the signal current in the valves 5, 13 does not produce any voltage drop in the supply unit, and is therefore not fed back to the grids of earlier valves through the lead 8. Grid bias for the valves 5, 13 is fed from a resistance 23 through a filter 34, 35. Further resistance-condenser filters 9, 10 ; 11, 12 may be employed between the anode lead 8 and the earlier valves. The valve 13 may be used to give a negative picture if the valve 5 gives a positive picture. Loss of high frequencies in the coupling between the valves 5, 13 may be controlled by a variable condenser 21. The Specification as open to inspection under Sect. 91, includes the method of decoupling for screen-grid valves described in Specification 468,350. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE464553X | 1935-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB464553A true GB464553A (en) | 1937-04-20 |
Family
ID=6540273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20555/36A Expired GB464553A (en) | 1935-07-25 | 1936-07-24 | Stabilisation of television amplifiers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB464553A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE757568C (en) * | 1939-01-01 | 1953-06-01 | Fernseh Gmbh | Tube arrangement for optional phase-correct or anti-phase reinforcement in television transmission devices |
DE926968C (en) * | 1949-07-21 | 1955-04-28 | Emi Ltd | Arrangement for adjustable deformation of electrical signals, in particular for television purposes |
DE959024C (en) * | 1946-04-17 | 1957-02-07 | N V Philips' Gloeilampenfabneken Eindhoven (Niederlande) | Circuit arrangement for generating a DC voltage for feeding a cathode ray tubes |
-
1936
- 1936-07-24 GB GB20555/36A patent/GB464553A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE757568C (en) * | 1939-01-01 | 1953-06-01 | Fernseh Gmbh | Tube arrangement for optional phase-correct or anti-phase reinforcement in television transmission devices |
DE959024C (en) * | 1946-04-17 | 1957-02-07 | N V Philips' Gloeilampenfabneken Eindhoven (Niederlande) | Circuit arrangement for generating a DC voltage for feeding a cathode ray tubes |
DE926968C (en) * | 1949-07-21 | 1955-04-28 | Emi Ltd | Arrangement for adjustable deformation of electrical signals, in particular for television purposes |
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