GB489666A - Improvements in or relating to electrical wave generators suitable for use in television and like apparatus - Google Patents

Improvements in or relating to electrical wave generators suitable for use in television and like apparatus

Info

Publication number
GB489666A
GB489666A GB2951/37A GB295137A GB489666A GB 489666 A GB489666 A GB 489666A GB 2951/37 A GB2951/37 A GB 2951/37A GB 295137 A GB295137 A GB 295137A GB 489666 A GB489666 A GB 489666A
Authority
GB
United Kingdom
Prior art keywords
impulses
produce
frequency
frame
frame frequency
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
GB2951/37A
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.)
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 GB489666A publication Critical patent/GB489666A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/042—Distributors with electron or gas discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Television Systems (AREA)

Abstract

489,666. Television ; converting. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 1, 1937, No. 2951. Convention date, Jan. 31, 1936. [Class 40 (iii)] [Also in Group XXXV] A complex wave form is produced by generating an electrical wave, deriving therefrom a shaped impulse, delaying the impulse to produce another impulse, and combining the two impulses to produce the complex wave. The invention is applied to developing a television synchronizing signal comprising line synchronizing impulses and frame synchronizing impulses, the latter consisting of impulses at twice the line frequency separated by longer pulses, as shown at 52. A master oscillator 1 produces oscillations which are subjected to frequency subdivision at 2 to produce the frame frequency. These oscillations at frame frequency are shaped at 4 to produce impulses 6 at frame frequency, and these are applied to a delay network 9, 11 from which tappings 13, 14, 16 are taken so that pulses 22, 23, 24 are produced, each phase shifted with respect to the others. The pulses 22, 23, 24 are combined to produce the complex wave 27 which recurs at frame frequency. The oscillator 1 is also applied to shaping devices 28, 43 to produce line frequency impulses 31, 45. The impulses 31 are applied to a network 32 from which tappings 30, 34 are taken to produce impulses shifted with respect to each other by such an amount that when they are combined, a sequence 38 is produced of impulses at double the line frequency. This sequence is applied to an amplifier 37 biassed by a pulse 39, derived from the frame frequency source 2, so that it only passes the pulses at frame frequency, thus producing a group 42 of impulses at frame frequency. The pulses 27, 42 are mixed to produce the frame synchronizing signal. The line synchronizing signals 45 are gapped at frame frequency by an amplifier 44 biassed similarly to amplifier 37, and are then mixed with the frame synchronizing signal to produce the final train 52.
GB2951/37A 1936-01-31 1937-02-01 Improvements in or relating to electrical wave generators suitable for use in television and like apparatus Expired GB489666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61665A US2145332A (en) 1936-01-31 1936-01-31 Television system

Publications (1)

Publication Number Publication Date
GB489666A true GB489666A (en) 1938-08-02

Family

ID=22037291

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2951/37A Expired GB489666A (en) 1936-01-31 1937-02-01 Improvements in or relating to electrical wave generators suitable for use in television and like apparatus

Country Status (2)

Country Link
US (1) US2145332A (en)
GB (1) GB489666A (en)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712114A (en) * 1955-06-28 aiken
US2423082A (en) * 1940-03-30 1947-07-01 Int Standard Electric Corp Impulse radiation obstacle detector
BE479585A (en) * 1941-09-12
NL74843C (en) * 1941-10-31
US2465840A (en) * 1942-06-17 1949-03-29 Emi Ltd Electrical network for forming and shaping electrical waves
US2537077A (en) * 1942-06-19 1951-01-09 Millard S Mcvay Double pulse generator
US2415929A (en) * 1942-09-26 1947-02-18 Rca Corp Radio pulse system
US2425600A (en) * 1942-12-14 1947-08-12 Gen Electric Pulse relay testing system
US2455265A (en) * 1943-04-09 1948-11-30 Gen Electric Pulse radar system
US2461321A (en) * 1943-06-24 1949-02-08 Ernst A Guillemin Production of electric pulses
US2444741A (en) * 1943-12-31 1948-07-06 Hazeltine Research Inc Wave-signal translating system
US2669711A (en) * 1944-05-19 1954-02-16 James R Moore Range measuring system
US2440253A (en) * 1944-07-04 1948-04-27 Standard Telephones Cables Ltd Pulse radar interference producer
US4232186A (en) * 1944-07-22 1980-11-04 Rca Corporation Method of and means for generating complex electrical coding waves for secret communications
US3983326A (en) * 1944-09-27 1976-09-28 Bell Telephone Laboratories, Incorporated Key pulse generator for secrecy signalling circuit
US2493379A (en) * 1945-02-16 1950-01-03 Eric W Anderson Pulse generating circuit
US2541986A (en) * 1945-03-15 1951-02-20 Claud E Cleeton Double pulse generator
US2659052A (en) * 1945-09-14 1953-11-10 Bess Leon Transmission line delay network
US2772399A (en) * 1945-09-19 1956-11-27 Andrew B Jacobsen Coded data transmission system
US2617883A (en) * 1945-12-10 1952-11-11 Hal O Anger Circuit for increasing duration of pulses
US2605408A (en) * 1946-01-15 1952-07-29 Millman Jacob Coordination circuit
US2496819A (en) * 1946-02-04 1950-02-07 Albert R Simpson Pulse generator
US2509923A (en) * 1946-03-08 1950-05-30 Hammond Instr Co Electrical musical apparatus
US2589254A (en) * 1946-03-18 1952-03-18 Conrad H Hoeppner Impulse delay apparatus
US2482974A (en) * 1946-04-30 1949-09-27 Bendix Aviat Corp Frequency multiplier having an output of pulse groups
US2602922A (en) * 1946-08-23 1952-07-08 Gen Electric Sensitivity time control
US2651716A (en) * 1947-11-08 1953-09-08 Int Standard Electric Corp Pulse code modulation demodulator
GB687769A (en) * 1948-08-31 1953-02-18 Ernest Oliver Holland Waveform generator, particularly for television
GB672125A (en) * 1948-09-06 1952-05-14 John Edward Cope Apparatus for generating television and like waveforms
US2657307A (en) * 1948-10-06 1953-10-27 Western Electric Co Positive feedback pulse generator
US2637811A (en) * 1949-01-18 1953-05-05 Ibm Pulse generating system
US2614218A (en) * 1949-11-23 1952-10-14 Collins Radio Co Timing device
US2678425A (en) * 1950-02-21 1954-05-11 Raytheon Mfg Co Analogue computer
FR1015728A (en) * 1950-03-30 1952-10-20 Csf Improvements to focused electron beam devices, such as microscopes
US2727942A (en) * 1950-05-11 1955-12-20 Don Lee Division Of General Te Television synchronizing apparatus
US2930848A (en) * 1954-06-29 1960-03-29 Thompson Ramo Wooldridge Inc Television synchronizing pulse generator
DE976758C (en) * 1954-10-11 1964-04-16 Kienzle Apparate Gmbh Device for generating groups of electrical pulses
US2850568A (en) * 1956-02-03 1958-09-02 Welsh William Pulse generators
US2971158A (en) * 1956-10-03 1961-02-07 Admiral Corp Delay line circuits
NL231353A (en) * 1957-09-13
US3094667A (en) * 1958-10-29 1963-06-18 Itt Noise reducing circuit employing the information on both leading and trailing edges of received pulses
US3040126A (en) * 1959-08-04 1962-06-19 Ampex Blanking circuit

Also Published As

Publication number Publication date
US2145332A (en) 1939-01-31

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