GB610706A - Improvements in or relating to synchronising signal generators for television systems - Google Patents

Improvements in or relating to synchronising signal generators for television systems

Info

Publication number
GB610706A
GB610706A GB5933/44A GB593344A GB610706A GB 610706 A GB610706 A GB 610706A GB 5933/44 A GB5933/44 A GB 5933/44A GB 593344 A GB593344 A GB 593344A GB 610706 A GB610706 A GB 610706A
Authority
GB
United Kingdom
Prior art keywords
frequency
peaks
grid
valve
relating
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
GB5933/44A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB610706A publication Critical patent/GB610706A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Details Of Television Scanning (AREA)

Abstract

610,706. Automatic control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 30, 1944, No. 5933. Convention date, July 30, 1942. [Class 38 (iv)] [Also in Groups XL (b) and XL (c)] Frequency.-In a television synchronizing-signal generator (see Group XL (b)) comprising a master oscillator 75 generating a frequency of 31,500 c.p.s. and connected through frequencydividers 105, 107, 109, 171, the last-named producing the field frequency of 60 c.p.s., this latter frequency (of saw-tooth form) is supplied to the first grid of valve 190 and 60 c.p.s. current from the mains is applied to the second grid which is negatively-biassed so that the valve will only pass current on the peaks. A direct current output is obtained proportional to the phase displacement of the peaks of the two supplies and is fed back over lead 220 to the junction of resistors 83, 85 in the frequencydetermining circuit of the master oscillator 75 to maintain the frequency constant.
GB5933/44A 1942-07-30 1944-03-30 Improvements in or relating to synchronising signal generators for television systems Expired GB610706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452921A US2350536A (en) 1942-07-30 1942-07-30 Synchronizing signal generator

Publications (1)

Publication Number Publication Date
GB610706A true GB610706A (en) 1948-10-20

Family

ID=23798509

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5933/44A Expired GB610706A (en) 1942-07-30 1944-03-30 Improvements in or relating to synchronising signal generators for television systems

Country Status (2)

Country Link
US (1) US2350536A (en)
GB (1) GB610706A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521009A (en) * 1943-02-24 1950-09-05 John H Homrighous Television system
US2521008A (en) * 1944-06-27 1950-09-05 John H Homrighous Television and sound multiplex system
US2487682A (en) * 1946-01-18 1949-11-08 Rca Corp Synchronizing system
US2515613A (en) * 1946-07-11 1950-07-18 Rca Corp Timer and synchronizing signal generator
US2497413A (en) * 1946-09-13 1950-02-14 Radio Television Inst Inc Synchronizing circuit
FR957140A (en) * 1946-12-11 1950-02-16
US2566832A (en) * 1946-12-18 1951-09-04 Rca Corp Synchronizing circuit
US2580903A (en) * 1947-06-02 1952-01-01 Rca Corp Color television system
US2551785A (en) * 1947-06-24 1951-05-08 Rca Corp Television synchronizing apparatus
US2593842A (en) * 1947-08-13 1952-04-22 Du Mont Allen B Lab Inc Phase discriminator
US2556933A (en) * 1947-10-18 1951-06-12 Du Mont Allen B Lab Inc Television synchronizing signal generator
US2516972A (en) * 1947-11-12 1950-08-01 Belmont Radio Corp Video signal generator
US2615979A (en) * 1948-07-07 1952-10-28 Du Mont Allen B Lab Inc Composite sync dissector
GB672195A (en) * 1948-09-06 1952-05-14 John Edward Cope Waveform shaping circuit
US2570775A (en) * 1948-12-30 1951-10-09 Rca Corp Electrical timing comparator circuit
US2597743A (en) * 1949-12-30 1952-05-20 Rca Corp Synchronizing system
US2655556A (en) * 1949-12-30 1953-10-13 Rca Corp Synchronizing system
US2839960A (en) * 1949-12-30 1958-06-24 Baldwin Piano Co Electronic synchronizing system for producing pitch discs and the like
US2660615A (en) * 1951-04-11 1953-11-24 Gen Electric Signal generation apparatus
US2845535A (en) * 1954-08-06 1958-07-29 Diamond Power Speciality Interlaced timer

Also Published As

Publication number Publication date
US2350536A (en) 1944-06-06

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