GB422906A - Improvements in and relating to signalling systems, such for example as television systems - Google Patents

Improvements in and relating to signalling systems, such for example as television systems

Info

Publication number
GB422906A
GB422906A GB11204/33A GB1120433A GB422906A GB 422906 A GB422906 A GB 422906A GB 11204/33 A GB11204/33 A GB 11204/33A GB 1120433 A GB1120433 A GB 1120433A GB 422906 A GB422906 A GB 422906A
Authority
GB
United Kingdom
Prior art keywords
resistance
synchronizing signals
condenser
grid
signals
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
Application number
GB11204/33A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority claimed from GB1052234A external-priority patent/GB422824A/en
Priority claimed from US720205A external-priority patent/US2252746A/en
Publication of GB422906A publication Critical patent/GB422906A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

422,906. Television. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, Middlesex, and WILLANS, P. W., 18, Park Hill Road, Hampstead, London. April 13, 1933, No. 11204. [Classes 40 (iii) and 40 (v)] The direct - current components of a television signal which are lost in an amplifier, are re-inserted by the operation of recurrent maximum or minimum signals, for example, synchronizing signals. The positive synchronizing signals on the grid of a valve 6 cause grid current to flow to give a charge to a condenser 7 which leaks away through a resistance 8. The grid potential thus becomes such that grid current just flows in response to the synchronizing signals. The picture signals are more negative and do not affect the average charge on the condenser. The time constant of the condenser and resistance is short compared with that of the circuits of the preceding amplifier. Since some loss of the direct-current components is inevitable, the anode resistance 9 is shunted by a circuit 34, 35 to attenuate the upper frequencies. According to modifications : the synchronizing signals are negative and a diode rectifying valve is used, Figs. 10 and 12 (not shown) ; the output of a high-impedance amplifier works into a shunt inductance across which are connected a rectifier and a low resistance in series, Fig. 11 (not shown).
GB11204/33A 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems Expired GB422906A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1052234A GB422824A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems
US720205A US2252746A (en) 1933-04-13 1934-04-12 Television device
US376827A US2307249A (en) 1933-04-13 1941-01-31 Television device

Publications (1)

Publication Number Publication Date
GB422906A true GB422906A (en) 1935-01-14

Family

ID=32096628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11204/33A Expired GB422906A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems

Country Status (5)

Country Link
US (1) US2307249A (en)
BE (1) BE402568A (en)
DE (1) DE939510C (en)
FR (1) FR771789A (en)
GB (1) GB422906A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753789C (en) * 1935-03-09 1952-11-17 Siemens & Halske A G Circuit arrangement for influencing the settling and decay times of an electrical circuit
DE766547C (en) * 1936-11-12 1954-08-09 Fernseh Gmbh Circuit with a variable degree of amplification for the amplification of symbols
DE972987C (en) * 1953-02-21 1959-11-19 L Outil Rbv Et De La Radio Ind Circuit arrangement for film recording of television pictures

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE465736A (en) * 1943-01-07
US2426654A (en) * 1943-05-25 1947-09-02 Sperry Gyroscope Co Inc Remote indicator for radio pulse systems
US2543037A (en) * 1946-01-07 1951-02-27 Farnsworth Res Corp Television receiver
US2708687A (en) * 1949-05-10 1955-05-17 Motorola Inc Combined direct current reinserter and synchronizing pulse separator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2037471A (en) * 1927-04-06 1936-04-14 Bell Telephone Labor Inc Electrooptical system
US1671302A (en) * 1927-05-31 1928-05-29 Bell Telephone Labor Inc Electrooptical transmission
NL48119C (en) * 1930-05-21
FR742835A (en) * 1931-09-16 1933-03-17
FR741301A (en) * 1931-09-18 1900-01-01
BE389285A (en) * 1931-09-26
DE742835C (en) * 1941-10-28 1943-12-13 Joseph Huber Dr Ing Mechanical energy storage for vehicles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753789C (en) * 1935-03-09 1952-11-17 Siemens & Halske A G Circuit arrangement for influencing the settling and decay times of an electrical circuit
DE766547C (en) * 1936-11-12 1954-08-09 Fernseh Gmbh Circuit with a variable degree of amplification for the amplification of symbols
DE972987C (en) * 1953-02-21 1959-11-19 L Outil Rbv Et De La Radio Ind Circuit arrangement for film recording of television pictures

Also Published As

Publication number Publication date
BE402568A (en)
DE939510C (en) 1956-03-15
US2307249A (en) 1943-01-05
FR771789A (en) 1934-10-16

Similar Documents

Publication Publication Date Title
GB515362A (en) Improvements in or relating to the transmission of electrical signals having a direct current component
GB471737A (en) Improvements in and relating to electric oscillation generators
US2985836A (en) Slicing circuits
GB422906A (en) Improvements in and relating to signalling systems, such for example as television systems
GB419441A (en) Improvements in or relating to television and the like systems
GB523476A (en) Arrangements for producing oscillations of a sawtooth wave form
GB699539A (en) Improvements in or relating to arrangements for modulating electric carrier wave oscillations
US2442304A (en) Pulse keying circuit
US2283415A (en) Signaling system
US2678387A (en) Tone converter
US2175335A (en) Television synchronizing circuits
US2424560A (en) Visual course indicator for radio directive systems
US2307834A (en) Signaling system
GB521984A (en) Improvements in apparatus for receiving television
GB409405A (en) Improvements in apparatus for interrupting carrier current
US2668248A (en) Pulse widening apparatus
GB375346A (en) Improvements in audio frequency signalling systems
GB515427A (en) Improvements in or relating to television and like systems
GB433332A (en) Improvements in or relating to wireless receiving circuits
GB520709A (en) Improvements in synchronising signal separating arrangements for electrical picture transmission systems
GB577191A (en) Improvements in or relating to radio telegraph receiving arrangements
GB422824A (en) Improvements in and relating to signalling systems, such for example as television systems
GB530426A (en) Automatic control system for television receivers
GB457812A (en) Improvements in or relating to television and like systems and circuits therefor
GB443031A (en) Improvements in or relating to television and like systems, and circuits therefor