GB1319809A - Pulse producing circuits - Google Patents
Pulse producing circuitsInfo
- 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
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.
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)
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 |
-
1970
- 1970-09-21 GB GB1319809D patent/GB1319809A/en not_active Expired
Cited By (2)
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 |