GB472900A - Method and arrangement for modulation of television transmitters with image and synchronisation signals - Google Patents

Method and arrangement for modulation of television transmitters with image and synchronisation signals

Info

Publication number
GB472900A
GB472900A GB9262/36A GB926236A GB472900A GB 472900 A GB472900 A GB 472900A GB 9262/36 A GB9262/36 A GB 9262/36A GB 926236 A GB926236 A GB 926236A GB 472900 A GB472900 A GB 472900A
Authority
GB
United Kingdom
Prior art keywords
modulator
valve
grid
image
current
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
GB9262/36A
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 GB472900A publication Critical patent/GB472900A/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
    • H04N5/06—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
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/24—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to different grid
    • 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
    • H04N5/40—Modulation circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Synchronizing For Television (AREA)
  • Transmitters (AREA)

Abstract

472,900. Television. RADIOAKT.-GES. D. S. LOEWE. March 28, 1936, Nos. 9262 and 9263. Convention dates, March 28, 1935 and Nov. 4, 1935. [Classes 40 (iii) and 40 (v)] A modulator 16 for synchronizing signals, which can reduce the high-frequency current to zero, co-operates with a modulator 9 for image signals which cannot reduce the highfrequency below a definite residual value. An apparatus 5 controls the peaks of the image signals so that black in the image reduces the electronic current in the valve 9 to zero. The valve is bridged by an adjustable impedance 11 to ensure that a minimum highfrequency current can always pass in the same phase as the electronic current. The capacitative coupling between the grid and anode circuits may be by the internal capacities of the valve. A screening-grid in the synchronizing modulator is earthed at high-frequency by condensers or a series resonant circuit 17, 18. According to modifications, the modulation may occur in a single pentode or hexode, Figs. 3 and 4 (not shown). The anode circuit may be tuned to a harmonic of the high-frequency supplied to the controlling grid. Specifications 457,879 and 465,915 are referred to.
GB9262/36A 1935-03-28 1936-03-28 Method and arrangement for modulation of television transmitters with image and synchronisation signals Expired GB472900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER92959D DE648402C (en) 1935-03-28 1935-03-28 Arrangement for modulating the carrier wave of a television transmitter with picture content voltages and the synchronization characters given in picture pauses

Publications (1)

Publication Number Publication Date
GB472900A true GB472900A (en) 1937-09-28

Family

ID=6541491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9262/36A Expired GB472900A (en) 1935-03-28 1936-03-28 Method and arrangement for modulation of television transmitters with image and synchronisation signals

Country Status (6)

Country Link
US (1) US2173496A (en)
BE (1) BE414633A (en)
DE (1) DE648402C (en)
FR (1) FR804325A (en)
GB (1) GB472900A (en)
NL (1) NL58585C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609509A (en) * 1945-06-13 1952-09-02 Bertram C Hill Electrical testing apparatus
US2469606A (en) * 1945-10-25 1949-05-10 Farnsworth Res Corp Video signal level control
NL74227C (en) * 1948-09-11
US2879501A (en) * 1953-04-30 1959-03-24 Baran Paul Null-responsive ratio-modulation multiplex data transmission systems
US2962549A (en) * 1955-03-30 1960-11-29 Alden Products Co Method and apparatus for generating facsimile signals

Also Published As

Publication number Publication date
NL58585C (en)
US2173496A (en) 1939-09-19
DE648402C (en) 1937-07-30
BE414633A (en)
FR804325A (en) 1936-10-21

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