GB886739A - Improvements in or relating to pulse-separating circuit arrangements - Google Patents
Improvements in or relating to pulse-separating circuit arrangementsInfo
- Publication number
- GB886739A GB886739A GB21854/58A GB2185458A GB886739A GB 886739 A GB886739 A GB 886739A GB 21854/58 A GB21854/58 A GB 21854/58A GB 2185458 A GB2185458 A GB 2185458A GB 886739 A GB886739 A GB 886739A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- pulses
- interference
- signal
- voltage
- 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)
- Noise Elimination (AREA)
- Details Of Television Scanning (AREA)
Abstract
886,739. Non-linear discharge tube circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. July 8, 1958 [July 10, 1957], No. 21854/58. Class 40(6). [Also in Group XL(b)] A limiter circuit for separating out interference signals, particularly for use in a television receiver in which the synchronizing pulses are positive and the picture signals negative going, comprises a negatively biased valve to the control electrode of which the detected signal is applied with the sync. pulses having positive polarity. The signal is also applied to a peak detector circuit having a network of time constant high relative to one period of the sync. signal and a limiting impedance connected in series with the rectifier the output voltage being applied to the control electrode of the limiter so that the peaks of the sync. pulses are at a level corresponding to the cut-off voltage of the limiter. In this way effective removal of the interfering pulses is produced even when the amplitude of the incoming signals varies considerably in either direction. Fig. 3 shows an interference separator circuit in which the detected input signal 22 has interference signals 19, 20, 21, the limiter tube 8 has a negative bias voltage which is approximately equal to the cut-off voltage of the tube. Capacitor 2 is charged via the second control grid 5<SP>1</SP> of tube 6<SP>1</SP> so that the peaks of the sync. pulses are substantially at earth potential, the time constant of the network 2, 3 being large compared with one line period. Only during the occurrence of interference pulses does anode current flow to produce an output signal 19<SP>1</SP>, 20<SP>1</SP>, 21<SP>1</SP>. The limiting resistor 4 ensures that no current flows during interfering pulses of short duration. No grid current flows in tube 8 unless the interfering signals are of such amplitude that they exceed the cut-off voltage of the tube, this effect being restricted by limiting resistor 35. Whatever amplitude variation of the video input signal may occur, for example due to A.V.C. variation, only the interference pulses appear at the output of tube 8. The interference signals separated out in tube 8 are supplied to the first control grid 30 of tube 61 via time constant circuit 28, 29, the interference signals 27 being applied with a polarity to cut-off the tube. The supply voltage for the screen grids 31, 32 is so chosen that the output signal 34 is substantially free of interference, the pulses 19, 20, 21 being removed from the output signal owing to the counteraction of signal 27.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL886739X | 1957-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB886739A true GB886739A (en) | 1962-01-10 |
Family
ID=19853783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21854/58A Expired GB886739A (en) | 1957-07-10 | 1958-07-08 | Improvements in or relating to pulse-separating circuit arrangements |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE569238A (en) |
DE (1) | DE1154829B (en) |
FR (1) | FR1207740A (en) |
GB (1) | GB886739A (en) |
NL (2) | NL97482C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1525256A (en) * | 1975-09-15 | 1978-09-20 | Rca Corp | Synchronizing signal separator having an automatic noise gate |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1010563B (en) * | 1954-11-17 | 1957-06-19 | Telefunken Gmbh | Circuit for suppressing interference in television receivers |
-
0
- BE BE569238D patent/BE569238A/xx unknown
- NL NL218839D patent/NL218839A/xx unknown
- NL NL97482D patent/NL97482C/xx active
-
1958
- 1958-07-05 DE DEN15303A patent/DE1154829B/en active Pending
- 1958-07-08 GB GB21854/58A patent/GB886739A/en not_active Expired
- 1958-07-09 FR FR1207740D patent/FR1207740A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL218839A (en) | |
DE1154829B (en) | 1963-09-26 |
NL97482C (en) | |
FR1207740A (en) | 1960-02-18 |
BE569238A (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2226994A (en) | Amplitude filter | |
US2300942A (en) | Television carrier-signal receiver control system | |
GB698296A (en) | Improvements in or relating to television receiver circuit arrangements | |
US2295346A (en) | Television and like system | |
GB669455A (en) | Arrangements for reducing distortion in electric signals | |
US2345668A (en) | Impulse generator | |
US2276455A (en) | Cathode-ray tube apparatus | |
US2353876A (en) | Signal mixing amplifier | |
US2341396A (en) | Electric discharge circuit | |
GB886739A (en) | Improvements in or relating to pulse-separating circuit arrangements | |
US2442304A (en) | Pulse keying circuit | |
GB740370A (en) | Noise cancellation circuits for synchronization pulse separator circuit in a television receiver | |
US2797258A (en) | Sync separator | |
US4148068A (en) | Television synchronizing signal separating circuit | |
US2906818A (en) | Transistor phase detector circuit | |
US2625603A (en) | Television pulse separation circuit | |
US3184547A (en) | Vertical sync separator circuit keyed at twice the horizontal line rate | |
US2118352A (en) | Periodic voltage generator | |
US2297612A (en) | Television and like system | |
US2137798A (en) | Television and the like transmission system | |
US2509975A (en) | Circuit for separation of frame from line synchronizing pulses | |
US2551250A (en) | Pulse discriminator | |
US2873314A (en) | Noise immune signal processing circuit | |
GB545756A (en) | Video-frequency signal-translating system for television receivers | |
US2950344A (en) | Compensated noise cancelling circuit |