US2265290A - System of synchronizing television transmissions - Google Patents

System of synchronizing television transmissions Download PDF

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Publication number
US2265290A
US2265290A US329568A US32956840A US2265290A US 2265290 A US2265290 A US 2265290A US 329568 A US329568 A US 329568A US 32956840 A US32956840 A US 32956840A US 2265290 A US2265290 A US 2265290A
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United States
Prior art keywords
tube
condenser
impulse
conductive
cathode
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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
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US329568A
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English (en)
Inventor
Knick Uirich
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Robert Bosch Fernsehanlagen GmbH
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Fernseh GmbH
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Filing date
Publication date
Application filed by Fernseh GmbH filed Critical Fernseh GmbH
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Publication of US2265290A publication Critical patent/US2265290A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator

Definitions

  • This invention relates to the synchronization of television transmissions, particularly to the synchronization of saw-tooth wave generators for deflection of electron beams, and is a refiling of application Serial No. 248,483 filed December 30, 1938.
  • a further object of this invention is to hold the voltage or current amplitude reached at the end of each saw-tooth cycle constant.
  • this invention provides the use of non-self-oscillatory circuits in which two conditions may prevail, according to the rising or declining portion of the saw-tooth wave to be produced; the first condition representing the charging period of a condenser, the second the discharging period of the same condenser.
  • a switching impulse is used to introduce the second condition, while a derivative thereof is used to terminate the second condition and to re-introduce the first condition.
  • an electron discharge tube may be used as a discharge path for the abovementioned condenser, whereby this discharge tube is rendered conductive by an impulse and rendered non-conductive by a derivative thereof.
  • the electron discharge tube can be rendered conductive by an impulse so as to discharge the aforementioned condenser, and, after the voltage across the condenser has reached a certain value, an impulse is released rendering the discharge tube non-conductive again.
  • Fig. 1 shows a circuit for voltage waves
  • Fig. 2 shows a circuit for producing saw-tooth producing saw-tooth current waves
  • Fig. 3 is a curve showing the potential of grid 34 of tube 35 in Fig. 2, as a function of time.
  • an impulse generator I which is not self-oscillatory.
  • 'Tubes '2 and 3 are connected through condensers 4 and 5 and resistors 6, I and 8 in a circuit of the multivibrator type.
  • Generator I is preferably synchronized by applying impulses of positive polarity to the control grid of tube 2.
  • This circuit is externally excited inasmuch as, upon arrival of an impulse from an impulse generator (not shown) of any known type capable of producing a periodical train of rectangular impulses, it initiates an impulse which is terminated by an impulse derived from theremaining part of the circuit, as will be seen later.
  • the impulses produced by the generator I are supplied through conductor I1 and condenser I8 to control grid I ea of discharge tube I 9.
  • Condenser 20 is charged through'resistor 25.
  • -As condenser 20 becomespositively charged the control grid 26a of tube 26 becomes more positive and the plate current in'tube 2'6 rises, causing an increasing voltage'drop across resistor'I5' in the plate circuit of tube 26.
  • generator I which renders discharge tube I9 conductive, whereupon condenser 20 starts to discharge through resistor 22 and tube I9.
  • a charging condenser 53 ischarged through resistors46, 41, 54 and 55 and periodically discharged through resistor 4
  • the potential acquired by condenser 53 is applied to the control grid 42 of tube 43, causing a saw-tooth curtube 43.
  • the combination consisting ofre'sistors 45, 46, 41 and choke coil 48, serves to cause an on suppressor grid 34 of tube 35 as a function of time, the dotted line representing the value which the voltage on suppressor grid 34 must exceed before current may flow to the plate of tube-35.
  • condenser 36 which was previously negatively charged as will be explained below, discharges through resistors 46, 41 and 58 and variable resistor 33 by means of which the discharge time can be varied. Suppressor grid 34 becomes more positive and would finally render the tube conductive.
  • These synchronizing impulsesrnay be generated by any suitable generator (not shown) of periodical square-topped waves, as is well known in the art. Before this happens, however, a synchronizing impulse of positive polarity is applied at terminal 30, and reaches suppressor grid 34 through condenser 32, rendering tube 35 conductive. Thereupon, condenser 53 starts to discharge through resistor 4 I and tube 3 5.
  • a negative charge is thereby also conveyed to condenser 36 which is also connected to lead 60 between screen grid 31 and the anode of diode 59 Tube 35 is rendered non-conductive, condenser 53 begins to charge again, plate current through tube 43 starts to rise and condenser 36 begins to charge, and the cycle repeats itself.
  • the plate of tube 35 is coupled with control grid 38 throughcondenser 40, a grid resistor 39 being connectedbetween control grid 38 and the cathode as shown.
  • Resistors 5B, 54 and 55 constitute a voltage divider.
  • By-,-pass condenser 51 is pro- It may be seen that the potential of a coridenser allowed to charge and periodically dis- 'rent wave to flow through scanning coil 44 connected between plate 43a. and screen grid 5
  • a saw-tooth wave generator comprising in combination a first electron discharge tube having a cathode, a control grid and an anode, a condenser coupled to said cathode and said control grid for controlling the flow of current in said tube in accordance with voltages developed across said condenser, a resistance element coupled to said anode and said cathode for developing a voltage drop" thereacross in accordance with the flow of current in said tube, means for charging said condenser, means for discharging said condenser including a second electron discharge tube, means for rendering said-discharge means operative, and a biased rectifier responsive to a predetermined value of the voltage drop across said resistance element and eflectively coupled to said discharging means for rendering said last-named means inoperative.
  • a saw-tooth wave generator comprising in combination a first electron discharge tube having a cathode, a control grid and an anode, a condenser coupled to said cathode and said control grid for controlling the flow of current in said tube in accordance with voltages developed across said condenser, a resistance element coupled to said anodev and said cathode fordeveloping a voltage drop thereacross in accordance with the flow of current in said tube, means for charging said condenser, means for discharging said condenser including a second electron discharge tube, a non-self-oscillating pulse generator adapted to initiate r'pulses, means for applying said pulses to said discharging means to render said last-named means operative, and a biased rectifier responsive to a predetermined value of the voltage drop across said resistance element and coupled to said generator for applying pulses thereto for terminating said pulses initiated by said-generator and rendering said discharging means inoperative.
  • a saw-tooth wave generator comprising in combination a first electron discharge tube having a cathode, a control grid and an anode, a condenser coupled to said cathode and said control grid for controlling the flow of current in said tube in accordance-with voltages developed ULRICH KNICK.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US329568A 1937-12-30 1940-04-13 System of synchronizing television transmissions Expired - Lifetime US2265290A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE523457X 1937-12-30

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US (1) US2265290A (fr)
FR (1) FR848178A (fr)
GB (1) GB523457A (fr)

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418826A (en) * 1943-01-22 1947-04-15 Bell Telephone Labor Inc Multivibrator circuit
US2436808A (en) * 1941-07-08 1948-03-02 Standard Telephones Cables Ltd Multivibrator
US2448070A (en) * 1944-08-30 1948-08-31 Philco Corp Saw-tooth generator with automatic amplitude control
US2448069A (en) * 1944-08-30 1948-08-31 Philco Corp Saw-tooth generator with automatic amplitude control
US2469227A (en) * 1946-01-30 1949-05-03 Rca Corp Electronic wave generating method and means
US2480599A (en) * 1945-11-30 1949-08-30 Oxford Alan John Henry Interference suppression system for radio receivers and the like
US2489269A (en) * 1940-05-15 1949-11-29 Claud E Cleeton Means for suppressing super numerary pulses
US2492018A (en) * 1944-11-11 1949-12-20 Philco Corp Synchronizing system for sawtooth wave generators
US2505549A (en) * 1945-09-14 1950-04-25 Us Sec War Integrating circuit
US2516867A (en) * 1948-06-12 1950-08-01 F A R Liquidating Corp Stabilized one-shot multivibrator
US2517703A (en) * 1947-07-25 1950-08-08 Franklin F Offner Synchronizing apparatus
US2519278A (en) * 1944-11-01 1950-08-15 Bell Telephone Labor Inc Pulse-actuated circuit
US2527342A (en) * 1943-12-18 1950-10-24 Emi Ltd Multivibrator and integrating circuit combination
US2539007A (en) * 1943-06-08 1951-01-23 Hartford Nat Bank & Trust Co Circuit arrangement for generating a voltage varying lineally with the time
US2542631A (en) * 1946-07-23 1951-02-20 Harry M Crain Variable timing circuit
US2557770A (en) * 1946-05-21 1951-06-19 Gen Electric Time base circuit
US2561066A (en) * 1946-09-27 1951-07-17 Int Standard Electric Corp Time base circuits for oscillographs
US2562188A (en) * 1945-12-27 1951-07-31 Harold V Hance Time base generator
US2568914A (en) * 1946-02-23 1951-09-25 Emi Ltd Electrical integrating circuits
US2591677A (en) * 1940-10-11 1952-04-08 Claud E Cleeton Pulse group system of communications
US2596167A (en) * 1945-10-10 1952-05-13 La Verne R Philpott Signal generating device
US2603750A (en) * 1947-02-28 1952-07-15 Emi Ltd Electrical circuit arrangement for the generation of oscillations
US2627031A (en) * 1946-11-27 1953-01-27 Rca Corp Relaxation oscillator
US2627025A (en) * 1946-04-18 1953-01-27 Gray C Trembly Sweep generator
US2643331A (en) * 1944-10-02 1953-06-23 Standard Telephones Cables Ltd Pulse converting system
US2670438A (en) * 1948-07-10 1954-02-23 Motorola Inc Automatic frequency control circuit
US2688079A (en) * 1946-02-21 1954-08-31 Us Navy Multivibrator
US2689910A (en) * 1951-02-21 1954-09-21 Int Standard Electric Corp System for the generation of electric pulses
US2701306A (en) * 1945-11-05 1955-02-01 Bess Leon Clamping circuit
US2702856A (en) * 1946-02-19 1955-02-22 Frank P Zaffarano Isolating circuit
US2709747A (en) * 1950-05-19 1955-05-31 Remington Rand Inc Impulse generating apparatus
US2721266A (en) * 1950-11-06 1955-10-18 Stodola Edwin King Oscilloscope sweep circuit
US2726329A (en) * 1952-03-22 1955-12-06 Itt Signal terminator circuit
US2727209A (en) * 1949-11-19 1955-12-13 Gen Electric Precision time interval measuring system
US2748272A (en) * 1952-06-27 1956-05-29 Hewlett Packard Co Frequency generator
US2750498A (en) * 1952-07-05 1956-06-12 Rca Corp Synchronization of television deflection systems
US2761099A (en) * 1951-02-05 1956-08-28 Will F Wilson Intermittently operated motor for camera
US2769905A (en) * 1953-08-18 1956-11-06 Tektronix Inc Sweep circuit
US2769904A (en) * 1953-08-18 1956-11-06 Tektronix Inc Gated sweep generator
US2787727A (en) * 1951-11-06 1957-04-02 Gen Electric Electrical system
US2794916A (en) * 1954-10-11 1957-06-04 Du Mont Allen B Lab Inc Sweep circuit
US2807717A (en) * 1951-05-26 1957-09-24 Ibm Measuring and indicating system
US2817833A (en) * 1953-04-24 1957-12-24 James O Hutchinson Accurate range indicator
US2822538A (en) * 1945-11-05 1958-02-04 Jr John B Trevor Pulse power control
US2824962A (en) * 1955-10-25 1958-02-25 David S Wise Sweep circuit oscillator
US2847270A (en) * 1945-11-28 1958-08-12 Quentin A Kerns Calutron oscillograph system
US2848563A (en) * 1954-04-29 1958-08-19 Donald G Scorgie Dielectric amplifier
US2850629A (en) * 1955-08-01 1958-09-02 Gen Dynamics Corp Sweep generator
US2851597A (en) * 1955-03-11 1958-09-09 Honeywell Regulator Co Saw tooth generators
US2883562A (en) * 1954-04-27 1959-04-21 Bell Telephone Labor Inc Circuit for producing timing control signals
US2900502A (en) * 1956-05-21 1959-08-18 Hymac Corp Sawtooth voltage generator

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489269A (en) * 1940-05-15 1949-11-29 Claud E Cleeton Means for suppressing super numerary pulses
US2591677A (en) * 1940-10-11 1952-04-08 Claud E Cleeton Pulse group system of communications
US2436808A (en) * 1941-07-08 1948-03-02 Standard Telephones Cables Ltd Multivibrator
US2418826A (en) * 1943-01-22 1947-04-15 Bell Telephone Labor Inc Multivibrator circuit
US2539007A (en) * 1943-06-08 1951-01-23 Hartford Nat Bank & Trust Co Circuit arrangement for generating a voltage varying lineally with the time
US2527342A (en) * 1943-12-18 1950-10-24 Emi Ltd Multivibrator and integrating circuit combination
US2448070A (en) * 1944-08-30 1948-08-31 Philco Corp Saw-tooth generator with automatic amplitude control
US2448069A (en) * 1944-08-30 1948-08-31 Philco Corp Saw-tooth generator with automatic amplitude control
US2643331A (en) * 1944-10-02 1953-06-23 Standard Telephones Cables Ltd Pulse converting system
US2519278A (en) * 1944-11-01 1950-08-15 Bell Telephone Labor Inc Pulse-actuated circuit
US2492018A (en) * 1944-11-11 1949-12-20 Philco Corp Synchronizing system for sawtooth wave generators
US2505549A (en) * 1945-09-14 1950-04-25 Us Sec War Integrating circuit
US2596167A (en) * 1945-10-10 1952-05-13 La Verne R Philpott Signal generating device
US2701306A (en) * 1945-11-05 1955-02-01 Bess Leon Clamping circuit
US2822538A (en) * 1945-11-05 1958-02-04 Jr John B Trevor Pulse power control
US2847270A (en) * 1945-11-28 1958-08-12 Quentin A Kerns Calutron oscillograph system
US2480599A (en) * 1945-11-30 1949-08-30 Oxford Alan John Henry Interference suppression system for radio receivers and the like
US2562188A (en) * 1945-12-27 1951-07-31 Harold V Hance Time base generator
US2469227A (en) * 1946-01-30 1949-05-03 Rca Corp Electronic wave generating method and means
US2702856A (en) * 1946-02-19 1955-02-22 Frank P Zaffarano Isolating circuit
US2688079A (en) * 1946-02-21 1954-08-31 Us Navy Multivibrator
US2568914A (en) * 1946-02-23 1951-09-25 Emi Ltd Electrical integrating circuits
US2627025A (en) * 1946-04-18 1953-01-27 Gray C Trembly Sweep generator
US2557770A (en) * 1946-05-21 1951-06-19 Gen Electric Time base circuit
US2542631A (en) * 1946-07-23 1951-02-20 Harry M Crain Variable timing circuit
US2561066A (en) * 1946-09-27 1951-07-17 Int Standard Electric Corp Time base circuits for oscillographs
US2627031A (en) * 1946-11-27 1953-01-27 Rca Corp Relaxation oscillator
US2603750A (en) * 1947-02-28 1952-07-15 Emi Ltd Electrical circuit arrangement for the generation of oscillations
US2517703A (en) * 1947-07-25 1950-08-08 Franklin F Offner Synchronizing apparatus
US2516867A (en) * 1948-06-12 1950-08-01 F A R Liquidating Corp Stabilized one-shot multivibrator
US2670438A (en) * 1948-07-10 1954-02-23 Motorola Inc Automatic frequency control circuit
US2727209A (en) * 1949-11-19 1955-12-13 Gen Electric Precision time interval measuring system
US2709747A (en) * 1950-05-19 1955-05-31 Remington Rand Inc Impulse generating apparatus
US2721266A (en) * 1950-11-06 1955-10-18 Stodola Edwin King Oscilloscope sweep circuit
US2761099A (en) * 1951-02-05 1956-08-28 Will F Wilson Intermittently operated motor for camera
US2689910A (en) * 1951-02-21 1954-09-21 Int Standard Electric Corp System for the generation of electric pulses
US2807717A (en) * 1951-05-26 1957-09-24 Ibm Measuring and indicating system
US2787727A (en) * 1951-11-06 1957-04-02 Gen Electric Electrical system
US2726329A (en) * 1952-03-22 1955-12-06 Itt Signal terminator circuit
US2748272A (en) * 1952-06-27 1956-05-29 Hewlett Packard Co Frequency generator
US2750498A (en) * 1952-07-05 1956-06-12 Rca Corp Synchronization of television deflection systems
US2817833A (en) * 1953-04-24 1957-12-24 James O Hutchinson Accurate range indicator
US2769905A (en) * 1953-08-18 1956-11-06 Tektronix Inc Sweep circuit
US2769904A (en) * 1953-08-18 1956-11-06 Tektronix Inc Gated sweep generator
US2883562A (en) * 1954-04-27 1959-04-21 Bell Telephone Labor Inc Circuit for producing timing control signals
US2848563A (en) * 1954-04-29 1958-08-19 Donald G Scorgie Dielectric amplifier
US2794916A (en) * 1954-10-11 1957-06-04 Du Mont Allen B Lab Inc Sweep circuit
US2851597A (en) * 1955-03-11 1958-09-09 Honeywell Regulator Co Saw tooth generators
US2850629A (en) * 1955-08-01 1958-09-02 Gen Dynamics Corp Sweep generator
US2824962A (en) * 1955-10-25 1958-02-25 David S Wise Sweep circuit oscillator
US2900502A (en) * 1956-05-21 1959-08-18 Hymac Corp Sawtooth voltage generator

Also Published As

Publication number Publication date
GB523457A (en) 1940-07-15
FR848178A (fr) 1939-10-24

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