GB1319809A - Pulse producing circuits - Google Patents

Pulse producing circuits

Info

Publication number
GB1319809A
GB1319809A GB1319809DA GB1319809A GB 1319809 A GB1319809 A GB 1319809A GB 1319809D A GB1319809D A GB 1319809DA GB 1319809 A GB1319809 A GB 1319809A
Authority
GB
United Kingdom
Prior art keywords
pulse
gating
time
sept
colour
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
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1319809A publication Critical patent/GB1319809A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

1319809 Television; pulse generating; gating circuits MULLARD Ltd 15 Sept 1971 [21 Sept 1970 17 May 1971] 44791/70 Headings H3T and H4F A circuit for production of a gating pulse (e.g. for colour-burst gating or black-level clamping in television receivers) during line flyback periods comprises a capacitor charged through R4 while diode D1 is non-conductive and discharged through D1 and the input potentiometer R1- R3 when the positive-going flyback pulse applied at A falls sufficiently. When the C1 is charged up to the bias voltage on T1 emitter (retained after a previous line flyback by the long time-constant R5C2) T1 will conduct, and will remain conducting until D1 discharges C1. By suitable choice of the time-constants R4C1 and R5C2 the pulse at T1 collector can be made suitable for colour-burst gating. Figs. 3, 4 and 6 (not shown) illustrate transistor circuits providing in different ways the two time-constants determining the start and end points of gating pulse. The chrominance signal to be gated may be also coupled to the base of T1.
GB1319809D 1970-09-21 1970-09-21 Pulse producing circuits Expired GB1319809A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4479170 1970-09-21

Publications (1)

Publication Number Publication Date
GB1319809A true GB1319809A (en) 1973-06-13

Family

ID=10434759

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1319809D Expired GB1319809A (en) 1970-09-21 1970-09-21 Pulse producing circuits

Country Status (1)

Country Link
GB (1) GB1319809A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2342610A1 (en) * 1976-02-27 1977-09-23 Rca Corp CHROMINANCE SUB-CARRIER SYNCHRONIZATION PULSE TRIGGER PULSE GENERATOR
FR2427023A1 (en) * 1978-05-24 1979-12-21 Rca Corp CHROMINANCE SYNCHRONIZATION CIRCUIT

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2342610A1 (en) * 1976-02-27 1977-09-23 Rca Corp CHROMINANCE SUB-CARRIER SYNCHRONIZATION PULSE TRIGGER PULSE GENERATOR
FR2427023A1 (en) * 1978-05-24 1979-12-21 Rca Corp CHROMINANCE SYNCHRONIZATION CIRCUIT

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees