GB1294617A - Synchronising signal separating circuit - Google Patents
Synchronising signal separating circuitInfo
- Publication number
- GB1294617A GB1294617A GB1406571A GB1406571A GB1294617A GB 1294617 A GB1294617 A GB 1294617A GB 1406571 A GB1406571 A GB 1406571A GB 1406571 A GB1406571 A GB 1406571A GB 1294617 A GB1294617 A GB 1294617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- sync
- emitter
- input
- noise
- 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
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
- H04N5/213—Circuitry for suppressing or minimising impulsive noise
-
- 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)
- Picture Signal Circuits (AREA)
Abstract
1294617 Television MATSUSHITA ELECTRONICS CORP 10 May 1971 14065/71 Heading H4F A sync. from video signal separating circuit comprises a sync. separating transistor 1 having its base connected to an input terminal 2 and emitter to ground with either the base (as shown) or the emitter (Fig. 5, not shown) self-biased by a capacitor 6 and a resistor 7, together with a noise gating circuit 10 comprising a Darlington circuit the collector-emitter path of transistor 12 being connected between the input terminal 2 and ground and being rendered conductive by a signal applied at terminal 9, which signal has been amplitude detected from the video signal applied at input 2 and comprises only noise signals having amplitudes greater than that of the sync. signal. The gating period of the Darlington circuit is sufficiently long to completely cover the noise pulse width at input 2 and thus prevent overcharging at the capacitor 6 of the self-biasing circuit. The complete circuit may be included in an integrated semi-conductor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1406571A GB1294617A (en) | 1971-05-10 | 1971-05-10 | Synchronising signal separating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1406571A GB1294617A (en) | 1971-05-10 | 1971-05-10 | Synchronising signal separating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1294617A true GB1294617A (en) | 1972-11-01 |
Family
ID=10034360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1406571A Expired GB1294617A (en) | 1971-05-10 | 1971-05-10 | Synchronising signal separating circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1294617A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632654A (en) * | 2017-03-23 | 2018-10-09 | 国基电子（上海）有限公司 | Signal switching circuit and front-end circuit |
| CN109309855A (en) * | 2017-07-27 | 2019-02-05 | 国基电子（上海）有限公司 | Demultiplexer and front-end circuit |
-
1971
- 1971-05-10 GB GB1406571A patent/GB1294617A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632654A (en) * | 2017-03-23 | 2018-10-09 | 国基电子（上海）有限公司 | Signal switching circuit and front-end circuit |
| CN108632654B (en) * | 2017-03-23 | 2021-10-22 | 国基电子（上海）有限公司 | Signal switching circuit and front-end circuit |
| CN109309855A (en) * | 2017-07-27 | 2019-02-05 | 国基电子（上海）有限公司 | Demultiplexer and front-end circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PE20 | Patent expired after termination of 20 years |