GB884419A - Improvements in or relating to circuit arrangements for separating out interference signals - Google Patents
Improvements in or relating to circuit arrangements for separating out interference signalsInfo
- Publication number
- GB884419A GB884419A GB22318/58A GB2231858A GB884419A GB 884419 A GB884419 A GB 884419A GB 22318/58 A GB22318/58 A GB 22318/58A GB 2231858 A GB2231858 A GB 2231858A GB 884419 A GB884419 A GB 884419A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- grid
- interference
- control
- line
- 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
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
- Details Of Television Scanning (AREA)
Abstract
884,419. Radio receiving systems; automatic gain control. PHILIPS ELECTRICAL INDUSTRIES Ltd. July 11, 1958 [July 11, 1957], No. 22318/58. Class 40(5). In an interference suppression circuit for negatively modulated television signals, the video signal which includes synchronizing pulses 12, 13, Fig. 2, and interference pulses 21, 22 is applied to the control grid 5 of an amplifier 1 whose screen grid is biased by contrast control 7, 8, the peaks of the interference pulses being removed by diodes 23, 24 and added in phase opposition to the amplified video signal in line and frame separators 25, 26. The control grid cut-off potential of valve 1 is indicated by line 11 in Fig. 2 and in order that diodes 23, 24 should pass the peaks of interference pulses which exceed the synchronizing pulses 12, 13, resistors 9, 10 are chosen so that line 11 corresponds to earth potential. If the contrast control 7, 8 is altered, i.e. a new screen grid voltage Vg<SP>11</SP> 2 is chosen, the amplitude of pulses 12<SP>1</SP>, 131 with respect to the new line 11<SP>1</SP> is slightly larger, resulting in a smaller A.G.C. voltage from valve 15 and a corresponding increase in the amplitude of the detected video signal, so that again the interference peaks which exceed the synchronizing pulse amplitude are removed. The interference suppression circuit thus functions independently of the contrast control adjustment. Automatic gain control. The anode of valve 15 is supplied with positive blanking pulses 16. Cathode 14 has a positive bias owing to its connection to the junction of resistors 9, 10, and the bias is counteracted by -supplying a corresponding bias from potential divider 18, 19 to grid 17. In an alternative circuit, Fig. 4 (not shown), resistor 9 is omitted, diodes 23, 24 are biased from point 7 through a resistor, and are connected to grid 5 through an R.C. network, potential divider 18, 19 being omitted and grid 17 being earthed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL884419X | 1957-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB884419A true GB884419A (en) | 1961-12-13 |
Family
ID=19853677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22318/58A Expired GB884419A (en) | 1957-07-11 | 1958-07-11 | Improvements in or relating to circuit arrangements for separating out interference signals |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE569280A (en) |
| DE (1) | DE1115286B (en) |
| GB (1) | GB884419A (en) |
| NL (4) | NL218873A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1279073B (en) * | 1965-09-14 | 1968-10-03 | Blaupunkt Werke Gmbh | Television receiver with an impulse filter |
-
0
- NL NL280187D patent/NL280187A/xx unknown
- NL NL113909D patent/NL113909C/xx active
- BE BE569280D patent/BE569280A/xx unknown
- NL NL103752D patent/NL103752C/xx active
- NL NL218873D patent/NL218873A/xx unknown
-
1958
- 1958-07-09 DE DEN15321A patent/DE1115286B/en active Pending
- 1958-07-11 GB GB22318/58A patent/GB884419A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE569280A (en) | |
| NL218873A (en) | |
| DE1115286B (en) | 1961-10-19 |
| NL280187A (en) | |
| NL103752C (en) | |
| NL113909C (en) |
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