GB1086542A - Improvements in or relating to circuit arrangements for producing a colour television signal or signals - Google Patents
Improvements in or relating to circuit arrangements for producing a colour television signal or signalsInfo
- Publication number
- GB1086542A GB1086542A GB17322/66A GB1732266A GB1086542A GB 1086542 A GB1086542 A GB 1086542A GB 17322/66 A GB17322/66 A GB 17322/66A GB 1732266 A GB1732266 A GB 1732266A GB 1086542 A GB1086542 A GB 1086542A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- signals
- colour
- low
- circuit
- 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
- 239000011159 matrix material Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000003287 optical effect 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
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
- H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
- H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
1,086,542. Colour television. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. April 20, 1966 [April 22, 1965; Sept. 17, 1965], No. 17322/66. Heading H4F. Colour signals E R , E G and E B from camera tubes 1, 2 and 3 are combined in matrix 6 to form a luminance signal E y * = 0À59 E G + 0À30 E R + 0À11 E B , which is of low definition (and hence low bandwidth) due to erroneous scanning registration, defocused scanning beams or defocused optical images, the signal being subtracted in circuit 7 from a high definition luminance signal E y = 0À59 E G + 0À30 E R + 0À11 E B obtained from a separate luminance camera tube 4 to obtain a difference signal E y - E y *, an adjustable proportion #of which is derived via potentiometer 22. This difference signal is then combined in adders 8, 9 and 10 with the original colour signals to produce modified signals E<SP>1</SP> R , E<SP>1</SP> G and E<SP>1</SP> B . The modified signals are gamma corrected in circuits 11, 12 and 13, and finally processed in matrix circuit 14 into E<SP>1</SP> 1 , E<SP>1</SP> Q and E<SP>1</SP>y in accordance with the N.T.S.C. standards. These final signals are suitable for transmission to a conventional N.T.S.C. receiver, the E<SP>1</SP> 1 and E<SP>1</SP> Q signals being limited in bandwidth in filters 15 and 16 and modulated in quadrature phase relationship onto a carrier signal in circuit 17 to produce a chrominance signal E<SP>1</SP> c in the customary manner. It is demonstrated that the brightness of the picture reproduced in the receiver is determined by E y + (# - 1) (E y - E y *). If # is chosen to be zero (thereby simulating the action of a camera comprising only colour tubes 1, 2 and 3), the reproduced brightness is proportional to E y * and the detail is poor due to the erroneous scanning registration and other factors. However, if in accordance with the invention, # is chosen to equal 1 the reproduced brightness is proportional to E y and the picture is free from the errors due to camera tubes 1, 2 and 3. Furthermore, if # is made greater than 1 (the preferred value lies between 1 and 2À5), the sharpness of the reproduced picture becomes even better than that inherent in the signal E y . In a first modification, Fig. 6 (not shown), it is arranged that the low-frequency components of the signal E y - E y * are supplied to adders 8, 9 and 10 with a lower value of # than the remaining signal components. This is done by deriving a first output from circuit 7 directly via a potentiometer (25) and a second output via a high-pass filter (24) and a second potentiometer (25). The amplitude of # for the low-frequency components is set by potentiometers (23) and the increase of the high frequencies over the low frequencies is set by potentiometers (25). In a second modification, Fig. 7 (not shown), colour-difference signals of the form E R - E y * are formed from the original colour signals in a matrix (18) and then the signal E y from the luminance camera tube is added to the colour difference signal to produce signals E R <SP>1</SP>, E<SP>1</SP> G and E<SP>1</SP> B . In this arrangement # is inherently restricted in value to 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6505086A NL6505086A (en) | 1965-04-22 | 1965-04-22 | |
NL6512108A NL6512108A (en) | 1965-09-17 | 1965-09-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1086542A true GB1086542A (en) | 1967-10-11 |
Family
ID=26643885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17322/66A Expired GB1086542A (en) | 1965-04-22 | 1966-04-20 | Improvements in or relating to circuit arrangements for producing a colour television signal or signals |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT259043B (en) |
BE (1) | BE679963A (en) |
ES (1) | ES325713A1 (en) |
GB (1) | GB1086542A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2001534A1 (en) * | 1968-02-08 | 1969-09-26 | Philips Nv | TELEVISION CAMERA |
-
1966
- 1966-04-19 AT AT367466A patent/AT259043B/en active
- 1966-04-20 ES ES0325713A patent/ES325713A1/en not_active Expired
- 1966-04-20 GB GB17322/66A patent/GB1086542A/en not_active Expired
- 1966-04-22 BE BE679963D patent/BE679963A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2001534A1 (en) * | 1968-02-08 | 1969-09-26 | Philips Nv | TELEVISION CAMERA |
Also Published As
Publication number | Publication date |
---|---|
ES325713A1 (en) | 1967-06-16 |
BE679963A (en) | 1966-10-24 |
AT259043B (en) | 1967-12-27 |
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