US2185131A - Impulse generator - Google Patents

Impulse generator Download PDF

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Publication number
US2185131A
US2185131A US92154A US9215436A US2185131A US 2185131 A US2185131 A US 2185131A US 92154 A US92154 A US 92154A US 9215436 A US9215436 A US 9215436A US 2185131 A US2185131 A US 2185131A
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US
United States
Prior art keywords
frequency
impulse
generator
line
control
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 - Lifetime
Application number
US92154A
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English (en)
Inventor
Schlesinger Kurt
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 RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2185131A publication Critical patent/US2185131A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to methods and apparatus for generating very exact synchronisation impulses from sinusoidal and filtered control frequencies; these frequencies being equal to those of the impulses or to a multiple of. them, and the duration of the impulses being capable of being adjusted to be as short as desired.
  • the apparatus generates simultaneously two groups of impulses, short line and long frame synchronisation impulses. It is ensured by special measures in accordance with the invention that there exists a mutual dependency of these two groups of impulses so that a frame signal can onlyini-- tiate at once with a line signal or,.in the case 16 of certain methods, exactly. in the middle between two line signals that is to say with the precision which is defined by the initiation of a line signal.
  • Fig. 1 shows the diagram of a single impulse generator
  • Fig. 2 is an oscillogram
  • I Fig. 3 shows the diagram of a complete generator arrangement for line and frame impulses.
  • Fig. 2 there are shown two wavelengths of a sinusoidal control tone frequency.
  • the grid bias of the tube is entered in the same diagram in the form of a broken line 12.
  • the first ignition accordingly takes place at 5 the point l3.
  • the impulse potentiol I l in the upper 10 diagram in Fig. 2 has reached .the value of the anode potential 3.1
  • the tube is extinguished at the point I 5.
  • the leak resistance I0 were so small that the discharge were to take place according to the curve [6, i. e., that the same were 15 completed before arrival of the second control tone change. a new ignition would occur at the point IT.
  • the number of impulses per second would accordingly be equal to the control frequency.
  • the 20 duration of the discharge RIOC! is made considerably longer, 1. e., the resistance Ill increased in size, so that the discharge occurs according to Ilia, the second control-impulse is unable to effect ignition at I! because the bias between grid. and cathode is still too negative, and the next ignition occurs at the point l8, i. e., omitting one control-impulse.
  • an impulse generation may be enforced at each 3 single control impulse by increasing the amplitude of the latter.
  • the control impulses are made variable in intensityby means of a potentiometer 26, Fig. 1 (see also the bottom of Fig. 3), so that at this '85 potentiometer the sequence of impulses may be adjusted as 1: /2:%, etc.
  • This protective resistance ensures that too high positive potentials of the grid of I9 are avoided. It should amount to 1 to 1 megohm being large in relation to the leak it.
  • impulses 4 By reason of its use there are obtained impulses 4;; having a rectangular top.
  • the control frequency generator 45 is represented in practice by an amplifier, which is connected with a photo-cell arranged behind a rim of slots in the scanning disc 32 chopping the light of the lamp 43.
  • the disc 32 is driven by a mains-fed synchronous motor (not shown).
  • the octave of the line frequency is supplied by 45.
  • the octave of the line frequency, and not the line frequency itself, is likewise employed for synchronisation by way of the passage 33 /34.
  • a line frequency impulse oscillation generator a frame frequency impulse oscillation generator, an arrangement for producing a control frequency controlling the first mentioned generator, the second mentioned generator being controlled by the mains frequency, means to conduct the output of said first mentioned generator and the output of said second mentioned generator to a common point of the transmitter, said means comprising screen grid tubes connecting the output of each generator to said point and having a common anode resistby the mains frequency and oscillating at half the 1 chopper and producing a control frequency equal to the double of the line frequency, a tuned am-- plifler for said control frequency, a line frequency impulse generator controlled by said control frequency and a frame frequency impulse generator controlled by the mains frequency and oscillating at the mains frequency, means to conduct the said control frequency additionally to the input of said frame frequency generator so 'as to synchronize it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US92154A 1935-07-29 1936-07-23 Impulse generator Expired - Lifetime US2185131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER93911D DE746966C (de) 1935-07-29 1935-07-29 Verfahren zur Erzeugung des aus Zeilen- und Zeilenzugimpulsen bestehenden Gemisches fuer Zeilensprungfernsehsendungen

Publications (1)

Publication Number Publication Date
US2185131A true US2185131A (en) 1939-12-26

Family

ID=6540619

Family Applications (1)

Application Number Title Priority Date Filing Date
US92154A Expired - Lifetime US2185131A (en) 1935-07-29 1936-07-23 Impulse generator

Country Status (5)

Country Link
US (1) US2185131A (en, 2012)
DE (1) DE746966C (en, 2012)
FR (1) FR810065A (en, 2012)
GB (1) GB466930A (en, 2012)
NL (1) NL56590C (en, 2012)

Also Published As

Publication number Publication date
DE746966C (de) 1944-12-27
NL56590C (en, 2012)
GB466930A (en) 1937-06-08
FR810065A (fr) 1937-03-15

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