GB459602A - Method of and arrangement for producing synchronising impulses for television transmitters - Google Patents

Method of and arrangement for producing synchronising impulses for television transmitters

Info

Publication number
GB459602A
GB459602A GB16431/35A GB1643135A GB459602A GB 459602 A GB459602 A GB 459602A GB 16431/35 A GB16431/35 A GB 16431/35A GB 1643135 A GB1643135 A GB 1643135A GB 459602 A GB459602 A GB 459602A
Authority
GB
United Kingdom
Prior art keywords
valve
oscillations
tube
frequency
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
Application number
GB16431/35A
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Publication of GB459602A publication Critical patent/GB459602A/en
Expired legal-status Critical Current

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
    • H04B1/1607—Supply circuits
    • H04B1/1623—Supply circuits using tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually
    • 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
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • 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)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Picture Signal Circuits (AREA)
  • Amplifiers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Television Systems (AREA)
  • Synchronizing For Television (AREA)

Abstract

459,602. Television. RADIOAKT.- GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. June 6, 1935, No. 16431. Convention date, June 7, 1934. Addition to 441,761. [Class 40 (iii)] In the parent Specification, the lead connecting the image signal amplifier of a television transmitter to the modulator 15 is earthed through a valve 1 for the period of the synchronizing signals. According to the present invention, the valve 1 is rendered conducting by an impulse derived from a gas-filled glow tube 8, which conducts at a predetermined amplitude of control oscillations and is extinguished independently of the control oscillations. Sinusoidal oscillations 3a, Fig. 3, of line frequency are applied to the grid of the tube 8 which is biassed to conduct at a level P of applied potential. The current passing through the tube charges a condenser 21 as shown in curve 3b, to a valve Q sufficient to quench the discharge. The charge on the condenser then flows away over a resistance 22 in a time approximately equal to the line period. This oscillation 3b is applied over a resistance capacity combination 6, 4, to produce an impulse 3c which is applied to render the valve 1 conducting. Frame frequency oscillations are similarly applied to a tube 9 to produce conductivity of valve 1 at frame frequency. The sinusoidal frame oscillations are preferably obtained from frequency reduction at 10 of the mains frequency of 50 c.s. at 16. The resistance-capacity couplings 6, 4, and 7, 5, have time constants smaller than the duration of the impulses applied to them.
GB16431/35A 1933-10-11 1935-06-06 Method of and arrangement for producing synchronising impulses for television transmitters Expired GB459602A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE445428X 1933-10-11
DE2226992X 1933-12-06
DE2163215X 1934-04-06

Publications (1)

Publication Number Publication Date
GB459602A true GB459602A (en) 1937-01-06

Family

ID=32073686

Family Applications (6)

Application Number Title Priority Date Filing Date
GB15148/34A Expired GB441761A (en) 1933-10-11 1934-05-22 Improvements in or relating to the method and means for the synchronisation of television receivers by the transmitter
GB29094/34A Expired GB445428A (en) 1933-10-11 1934-10-11 Method for synchronising the reception of television images
GB19660/35A Expired GB453463A (en) 1933-10-11 1934-12-05 Method and arrangement for producing regulating biasses
GB34895/34A Expired GB451578A (en) 1933-10-11 1934-12-05 Improvements in television systems
GB16431/35A Expired GB459602A (en) 1933-10-11 1935-06-06 Method of and arrangement for producing synchronising impulses for television transmitters
GB33144/35A Expired GB466571A (en) 1933-10-11 1935-11-29 Improvements in or relating to television

Family Applications Before (4)

Application Number Title Priority Date Filing Date
GB15148/34A Expired GB441761A (en) 1933-10-11 1934-05-22 Improvements in or relating to the method and means for the synchronisation of television receivers by the transmitter
GB29094/34A Expired GB445428A (en) 1933-10-11 1934-10-11 Method for synchronising the reception of television images
GB19660/35A Expired GB453463A (en) 1933-10-11 1934-12-05 Method and arrangement for producing regulating biasses
GB34895/34A Expired GB451578A (en) 1933-10-11 1934-12-05 Improvements in television systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB33144/35A Expired GB466571A (en) 1933-10-11 1935-11-29 Improvements in or relating to television

Country Status (5)

Country Link
US (2) US2226992A (en)
BE (3) BE412530A (en)
FR (6) FR773649A (en)
GB (6) GB441761A (en)
NL (3) NL43702C (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254204A (en) * 1936-05-15 1941-09-02 Emi Ltd Television system
DE741786C (en) * 1936-07-17 1943-11-17 Opta Radio Ag Television scanning arrangement in which the light beam scanning the image is also used to generate synchronizing characters
DE755948C (en) * 1937-01-09 1955-07-28 Opta Radio A G Amplitude filter circuit for the separation of picture content signals and synchronization characters in television
DE757397C (en) * 1937-03-18 1952-12-01 Emi Ltd Circuit for separating parts of a voltage curve that fluctuates over time
DE882252C (en) * 1938-11-10 1953-07-06 Telefunken Gmbh Circuit for the decrease of the control voltages for the line and line extension deflection in television receivers
DE742435C (en) * 1938-12-25 1943-12-03 Fernseh Gmbh Arrangement for separating the line and picture change pulses of the same amplitude, but different duration and frequency, when watching television
US2532799A (en) * 1944-08-01 1950-12-05 Rca Corp Facsimile system having rotating scanner moving longitudinally within stationary transparent drum
NL74227C (en) * 1948-09-11
WO1996007002A1 (en) 1994-08-26 1996-03-07 Kensington Microware Limited Security device for a portable computer
US6662602B1 (en) 1996-11-08 2003-12-16 Acco Brands, Inc. Security device for a portable computer

Also Published As

Publication number Publication date
GB445428A (en) 1936-04-09
FR45574E (en) 1935-10-17
GB453463A (en) 1936-09-07
US2163215A (en) 1939-06-20
NL43702C (en)
GB451578A (en) 1936-08-05
BE395149A (en)
BE405608A (en)
US2226992A (en) 1940-12-31
BE412530A (en)
GB441761A (en) 1936-01-22
FR773649A (en) 1934-11-22
NL44585C (en)
FR46739E (en) 1936-08-10
NL45395C (en)
FR46290E (en) 1936-04-08
FR46082E (en) 1936-02-15
GB466571A (en) 1937-05-31
FR779533A (en) 1934-04-08

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