GB1008739A - Improvements in or relating to timing pulse generators - Google Patents

Improvements in or relating to timing pulse generators

Info

Publication number
GB1008739A
GB1008739A GB3227161A GB3227161A GB1008739A GB 1008739 A GB1008739 A GB 1008739A GB 3227161 A GB3227161 A GB 3227161A GB 3227161 A GB3227161 A GB 3227161A GB 1008739 A GB1008739 A GB 1008739A
Authority
GB
United Kingdom
Prior art keywords
capacitor
pulses
diode
field
sequence
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
GB3227161A
Inventor
Eric Davies
Roger Wakefield Fenton
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.)
BAE Systems Electronics Ltd
Original Assignee
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB3227161A priority Critical patent/GB1008739A/en
Priority to DEM53929A priority patent/DE1191415B/en
Priority to FR908740A priority patent/FR1333301A/en
Priority to GB1030163A priority patent/GB1074585A/en
Publication of GB1008739A publication Critical patent/GB1008739A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H03K3/351—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being unijunction transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H03K3/352—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being thyristors
    • 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)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

1,008,739. Pulse discriminating circuits. MARCONI CO. Ltd. June 1, 1962 [Sept. 8, 1961], No. 32271/61. Heading H3T. In a synchronizing pulse separator for television equipment, the composite line and field synchronizing pulses are integrated in a capacitor K so that only the longer-duration field pulses result in the capacitor charging sufficiently to trigger a negative resistance semi-conductor device. As shown, positive - going line and field pulses at terminal A are integrated by resistor R 1 , capacitor K and diode D. Only the longer-duration field pulses charge capacitor K sufficiently to trigger the unijunction transistor, giving an output pulse at C. Capacitor K now discharges via resistor R 3 , the time constant being such that the diode D is rendered non-conductive for the duration of the sequence of field synchronizing pulses. This ensures that only one output pulse is provided at C for each sequence of field pulses. In Fig. 1 (not shown), diode D is omitted, the circuit executing a series of sawtooth oscillations during the sequence of field pulses. In Fig. 6 (not shown), composite pulses derived from a high impedance source, are fed directly to capacitor K, the remote end of resistor R 1 being connected to a point of constant potential so as to provide temperature compensation. In Fig. 5 (not shown), the unijunction transistor is replaced by a four-layer diode.
GB3227161A 1961-09-08 1961-09-08 Improvements in or relating to timing pulse generators Expired GB1008739A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3227161A GB1008739A (en) 1961-09-08 1961-09-08 Improvements in or relating to timing pulse generators
DEM53929A DE1191415B (en) 1961-09-08 1962-08-17 Circuit arrangement for separating the longer picture sync pulses from the shorter line sync pulses of a television sync pulse mixture
FR908740A FR1333301A (en) 1961-09-08 1962-09-06 Improvements to synchronization pulse generators
GB1030163A GB1074585A (en) 1961-09-08 1963-03-15 Improvements in or relating to timing pulse generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3227161A GB1008739A (en) 1961-09-08 1961-09-08 Improvements in or relating to timing pulse generators

Publications (1)

Publication Number Publication Date
GB1008739A true GB1008739A (en) 1965-11-03

Family

ID=10336012

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3227161A Expired GB1008739A (en) 1961-09-08 1961-09-08 Improvements in or relating to timing pulse generators
GB1030163A Expired GB1074585A (en) 1961-09-08 1963-03-15 Improvements in or relating to timing pulse generators

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1030163A Expired GB1074585A (en) 1961-09-08 1963-03-15 Improvements in or relating to timing pulse generators

Country Status (2)

Country Link
DE (1) DE1191415B (en)
GB (2) GB1008739A (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968770A (en) * 1958-11-19 1961-01-17 Gen Electric Unijunction transistor circuit

Also Published As

Publication number Publication date
GB1074585A (en) 1967-07-05
DE1191415B (en) 1965-04-22

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