GB961886A - Circuit arrangement for maintaining the synchronization of a television receiver - Google Patents
Circuit arrangement for maintaining the synchronization of a television receiverInfo
- Publication number
- GB961886A GB961886A GB1161362A GB1161362A GB961886A GB 961886 A GB961886 A GB 961886A GB 1161362 A GB1161362 A GB 1161362A GB 1161362 A GB1161362 A GB 1161362A GB 961886 A GB961886 A GB 961886A
- Authority
- GB
- United Kingdom
- Prior art keywords
- video signal
- source
- receiver
- auxiliary
- impedance
- 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
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Synchronizing For Television (AREA)
Abstract
961,886. Television. FERNSEH G.m.b.H. March 27, 1962 [April 1, 1961], No. 11613/62. Heading H4F. The object of the invention is to ensure that a television receiver which is connected to a low impedance video signal source via a switching device receives synchronization pulses when the switching device is operated so that the video signal is not applied to the receiver. This object is achieved by continually applying to the receiver auxiliary synchronization pulses from a high impedance source which is effectively short-circuited by the low impedance of the video signal source when the latter is applied. In a basic form of the invention (Fig. 1, not shown), the auxiliary source is applied to each of two receivers which may receive any one of three video signals by way of a cross-bar switching system. In a more detailed embodiment (Fig. 2), a receiver (not shown), connected to the channel 7 receives any one of three video signals through input channels K1, K2, K3 and relay contacts Sch1, Sch2, Sch3. The auxiliary source is applied to the signal grid 1 of one stage of output valve 5 through inverter 13 and high impedance 8, 9. The time constant of this impedance is chosen to be equal to the time constant of the grid leak resistor 15 in association with the stray capacitance of the valve 5. When a video signal is applied by energizing the corresponding relay the resistance between the point P1 and earth is small compared to the resistance 8 and the auxiliary source is effectively short-circuited. The valve 5 may be replaced by a transistor. The amplitude of the auxiliary synchronizing pulses is preferably half that of those included in the video signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF33560A DE1146914B (en) | 1961-04-01 | 1961-04-01 | Circuit arrangement for maintaining the synchronization of a television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB961886A true GB961886A (en) | 1964-06-24 |
Family
ID=7095146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1161362A Expired GB961886A (en) | 1961-04-01 | 1962-03-27 | Circuit arrangement for maintaining the synchronization of a television receiver |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1146914B (en) |
| GB (1) | GB961886A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049391B2 (en) * | 1979-06-29 | 1985-11-01 | パイオニアビデオ株式会社 | video switch circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2697746A (en) * | 1951-05-24 | 1954-12-21 | Rca Corp | Television program signal distribution system |
-
1961
- 1961-04-01 DE DEF33560A patent/DE1146914B/en active Pending
-
1962
- 1962-03-27 GB GB1161362A patent/GB961886A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1146914B (en) | 1963-04-11 |
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