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GB490150A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB490150A
GB490150A GB6409/37A GB640937A GB490150A GB 490150 A GB490150 A GB 490150A GB 6409/37 A GB6409/37 A GB 6409/37A GB 640937 A GB640937 A GB 640937A GB 490150 A GB490150 A GB 490150A
Authority
GB
United Kingdom
Prior art keywords
diode
valve
condenser
anode
signals
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
GB6409/37A
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Publication of GB490150A publication Critical patent/GB490150A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Television Scanning (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Dc-Dc Converters (AREA)

Abstract

490,150. Television. ELECTRIC & MUSICAL INDUSTRIES, Ltd., and BLUMLEIN, A. D. March 4, 1937, No. 6409. Addition to 455,375. [Class 40 (iii)] To derive framing and line synchronizing signals from mixed synchronizing signals, a condenser 5, in parallel with a resistance 4, is charged under the control of a valve 1, and the time constant of the resistance and condenser is greater than the intervals between the synchronizing signals but is made effectively short by a diode 6 or other unilateral conductor which maintains a predetermined voltage across the condenser in the intervals between the signals. The mixed signals are applied to the input circuit 2, 3 of the valve. The resistance and condenser are in the anode circuit of the valve and the diode is so connected between a potentiometer 9, 10, 11 and the anode that the diode only conducts when the charge on the condenser reaches the predetermined value. The cathode of a diode 7 is connected to the anode of the valve 1 and the anode if the diode is connected to a point 14 on the potentiometer such that the diode conducts only on the occurrence of a framing signal. The diode is connected to the potentiometer through a coil 13 which is coupled to a blocking oscillator producing a saw-tooth wave. When the valve 1 is of the screened-grid type, the line-frequency signals are taken from the screening grid.
GB6409/37A 1935-01-15 1937-03-04 Improvements in or relating to television systems Expired GB490150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408/35A GB455375A (en) 1935-01-15 1935-01-15 Improvements in and relating to television and like systems

Publications (1)

Publication Number Publication Date
GB490150A true GB490150A (en) 1938-08-10

Family

ID=32096607

Family Applications (3)

Application Number Title Priority Date Filing Date
GB1408/35A Expired GB455375A (en) 1935-01-15 1935-01-15 Improvements in and relating to television and like systems
GB1728/37A Expired GB489231A (en) 1935-01-15 1937-01-20 Improvements in or relating to television systems
GB6409/37A Expired GB490150A (en) 1935-01-15 1937-03-04 Improvements in or relating to television systems

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB1408/35A Expired GB455375A (en) 1935-01-15 1935-01-15 Improvements in and relating to television and like systems
GB1728/37A Expired GB489231A (en) 1935-01-15 1937-01-20 Improvements in or relating to television systems

Country Status (5)

Country Link
US (3) US2227066A (en)
BE (1) BE413315A (en)
DE (2) DE754557C (en)
FR (3) FR800602A (en)
GB (3) GB455375A (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734945A (en) * 1956-02-14 Wave generating systems
DE959375C (en) * 1937-07-22 1957-03-07 Telefunken Gmbh Circuit arrangement for synchronizing a process by means of pulses, in particular for television purposes
DE763150C (en) * 1937-07-22 1953-01-05 Telefunken Gmbh Circuit arrangement for separating the image change pulses from a pulse mixture which also contains the line pulses
BE464095A (en) * 1944-03-25
US2506124A (en) * 1944-03-28 1950-05-02 Emi Ltd Circuit arrangement for indicating the duration of electrical pulses
US2603747A (en) * 1944-04-24 1952-07-15 Sperry Corp Sweep circuit
US2429844A (en) * 1945-01-13 1947-10-28 Max I Rothman Pulse delay circuits
US2431577A (en) * 1945-03-14 1947-11-25 Philco Corp Synchronizing system
NL76844C (en) * 1945-07-14
GB621494A (en) * 1946-01-08 1949-04-11 Dennis Illingworth Lawson Improvements in or relating to television receivers
US2567977A (en) * 1946-08-24 1951-09-18 Bendix Aviat Corp Electric trip circuit
US2628313A (en) * 1948-10-01 1953-02-10 Motorola Inc Synchronization system
US2616964A (en) * 1949-05-19 1952-11-04 Philco Corp Synchronizing separator for television receivers
US2585929A (en) * 1949-06-10 1952-02-19 Gen Electric Synchronizing system for resonant circuit oscillators
US2606939A (en) * 1949-06-25 1952-08-12 Standard Oil Co Conversion of olefins, carbon monoxide, and hydrogen
NL74981C (en) * 1949-12-21
US2739182A (en) * 1950-02-02 1956-03-20 Avco Mfg Corp Single-tube control circuit for horizontal and vertical deflecting systems of a television receiver
BE514315A (en) * 1951-09-20
US2776370A (en) * 1952-06-27 1957-01-01 Harold N Beveridge Pulse width discriminator
US2834918A (en) * 1953-09-04 1958-05-13 Westinghouse Electric Corp Electric discharge apparatus
US2820845A (en) * 1954-09-01 1958-01-21 Rca Corp Frequency controlled oscillators
US2952738A (en) * 1956-01-09 1960-09-13 Glen L Akins Television viewfinder marker signal generators
US2883535A (en) * 1956-03-15 1959-04-21 Creveling Robert Thyratron switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR742671A (en) * 1931-09-30 1933-03-13
AT144309B (en) * 1934-04-28 1936-01-10 Rca Corp Switching arrangement for synchronizing a television receiver.

Also Published As

Publication number Publication date
GB489231A (en) 1938-07-20
DE754557C (en) 1952-12-01
DE893806C (en) 1953-10-19
FR832232A (en) 1938-09-23
GB455375A (en) 1936-10-15
US2210523A (en) 1940-08-06
BE413315A (en) 1936-02-29
US2227066A (en) 1940-12-31
US2212933A (en) 1940-08-27
FR800602A (en) 1936-07-15
FR49228E (en) 1938-12-07

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