GB490676A - Improvements in or relating to synchronising pulse separating circuits for teleyision systems - Google Patents

Improvements in or relating to synchronising pulse separating circuits for teleyision systems

Info

Publication number
GB490676A
GB490676A GB4541/37A GB454137A GB490676A GB 490676 A GB490676 A GB 490676A GB 4541/37 A GB4541/37 A GB 4541/37A GB 454137 A GB454137 A GB 454137A GB 490676 A GB490676 A GB 490676A
Authority
GB
United Kingdom
Prior art keywords
frame
network
pulses
line
circuit
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
GB4541/37A
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.)
Telefunken AG
Original Assignee
Telefunken AG
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB490676A publication Critical patent/GB490676A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
    • 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
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa
    • 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
    • H04N5/455—Demodulation-circuits

Abstract

490,676. Television. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. Feb. 15, 1937, No. 4541. Convention date, March 19, 1936. [A Specification was laid open to inspection under Sect. 91 of the Acts, Aug. 16, 1937.] [Class 40 (iii)] A circuit arrangement for separating line and frame synchronizing pulses in a television system comprises a screen-grid valve 10, to the control grid of which the synchronizing pulses (differing in duration) are applied and having in its anode circuit the line-deflecting coil 11 of a cathode-ray tube, the coil 11 being shunted by a circuit including a rectifier 12, and a resistance capacity network 15 being connected in the circuit of the screening grid. With this arrangement a saw-tooth wave form at the linefrequency is generated in coil 11 and pulses at the frame-frequency may be taken from network 15 at point A and applied directly or through an amplitude-selecting stage to a sawtooth oscillator for the frame-frequency. A network 14, comprising resistance 18 shunted by capacity and having a time-constant at least of the order of a line period and which may be greater than a frame period, is connected in series with rectifier 12. Specification 400,976 is referred to. The Specification as open to inspection under Sect. 91 comprises also a similar arrangement for use in a system in which one or more line pulses are omitted before a frame pulse, particularly for a system with interlaced scanning. The network 14 is replaced by a potential source of lower potential than the anode source 13, and the pulses at the frame-frequency may be taken off from the network 15, which contains inductance, through a transformer coupling. This subject-matter does not appear in the Specification as accepted.
GB4541/37A 1936-03-20 1937-02-15 Improvements in or relating to synchronising pulse separating circuits for teleyision systems Expired GB490676A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER95858D DE730998C (en) 1936-03-20 1936-03-20 Television receiving circuitry

Publications (1)

Publication Number Publication Date
GB490676A true GB490676A (en) 1938-08-15

Family

ID=25944618

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4541/37A Expired GB490676A (en) 1936-03-20 1937-02-15 Improvements in or relating to synchronising pulse separating circuits for teleyision systems
GB7680/37A Expired GB492337A (en) 1936-03-20 1937-03-16 Rectifier for television signals

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB7680/37A Expired GB492337A (en) 1936-03-20 1937-03-16 Rectifier for television signals

Country Status (5)

Country Link
US (1) US2201794A (en)
DE (1) DE730998C (en)
FR (2) FR819404A (en)
GB (2) GB490676A (en)
NL (1) NL49860C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458365A (en) * 1946-09-11 1949-01-04 Motorola Inc Television receiver
US3911317A (en) * 1973-08-24 1975-10-07 Bell Telephone Labor Inc Current bootstrap to reduce interelectrode capacitance effect in a vacuum tube

Also Published As

Publication number Publication date
FR819408A (en) 1937-10-20
NL49860C (en) 1941-02-15
FR819404A (en) 1937-10-19
GB492337A (en) 1938-09-16
US2201794A (en) 1940-05-21
DE730998C (en) 1943-01-30

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