GB1213196A - Improvements in or relating to circuit arrangements for modifying television signals - Google Patents
Improvements in or relating to circuit arrangements for modifying television signalsInfo
- Publication number
- GB1213196A GB1213196A GB1181368A GB1181368A GB1213196A GB 1213196 A GB1213196 A GB 1213196A GB 1181368 A GB1181368 A GB 1181368A GB 1181368 A GB1181368 A GB 1181368A GB 1213196 A GB1213196 A GB 1213196A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- switch
- output
- circuit
- pulses
- 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
- 239000002131 composite material Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/74—Circuits for processing colour signals for obtaining special effects
- H04N9/76—Circuits for processing colour signals for obtaining special effects for mixing of colour signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Picture Signal Circuits (AREA)
- Studio Circuits (AREA)
Abstract
1,213,196. Television. FERNSEH G.m.b.H. 11 March, 1968 [11 March, 1967], No. 11813/68. Heading H4F. A circuit is provided which enables colour or black and white television signals to be mixed, faded in and out, or to have correction applied with out affecting the synchronizing or test signal components. As shown, a composite television signal selected by a switch 12 is supplied to an amplifier 2 whose gain is continuously or stepwise adjustable and to an amplifier 3 whose gain is preset to the maximum value of the gain of amplifier 2. After the black levels have been adjusted to the same value by stages 5, 6, the outputs of the amplifiers are supplied via an electronic changeover switch 4 to the output amplifier 7. The switch 4 is controlled by pulses U consisting of pulses (U H ) extending over each horizontal flyback time and pulses (U V ) extending over each vertical blanking interval, Fig. 1 (not shown), which are derived by a circuit 9 from the input signal, or alternatively, from a separate source S via switch 10. By this means the switch 4 is timed to connect the amplifier 2 to the output while the picture information is being transmitted and the amplifier 3 to the output when synchronizing or test signals are being transmitted. A switch 11 may be arranged to select a constant potential to provide a blanked video signal at the output 7 or alternatively may be switched to introduce an external source S of sync. signals. A plurality of these circuits may be combined through a common adding circuit Fig. 3 (not shown). In a modification of Fig. 2, a gamma control stage and a colour matching circuit are included in series with the amplifier 2 thus necessitating a compensating delay circuit in series with the amplifier 3. Means are also provided for independent adjustment of the black level at the output of amplifier 2.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1967N0030146 DE1281484B (en) | 1967-03-11 | 1967-03-11 | Circuit arrangement for fading in and out and for mixing color and black-and-white television signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1213196A true GB1213196A (en) | 1970-11-18 |
Family
ID=7345410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1181368A Expired GB1213196A (en) | 1967-03-11 | 1968-03-11 | Improvements in or relating to circuit arrangements for modifying television signals |
Country Status (3)
Country | Link |
---|---|
DE (2) | DE1281484B (en) |
GB (1) | GB1213196A (en) |
NL (1) | NL150985B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992008405A1 (en) | 1990-11-19 | 1992-05-29 | Olympus Optical Co., Ltd. | Device for processing image of endoscope and method thereof |
-
1967
- 1967-03-11 DE DE1967N0030146 patent/DE1281484B/en not_active Withdrawn
-
1968
- 1968-03-08 NL NL6803375A patent/NL150985B/en not_active IP Right Cessation
- 1968-03-11 GB GB1181368A patent/GB1213196A/en not_active Expired
- 1968-10-31 DE DE19681806340 patent/DE1806340A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1806340A1 (en) | 1969-10-16 |
NL6803375A (en) | 1968-09-12 |
DE1281484B (en) | 1968-10-31 |
NL150985B (en) | 1976-09-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |