GB1082151A - Arrangement for suppressing colour flicker - Google Patents
Arrangement for suppressing colour flickerInfo
- Publication number
- GB1082151A GB1082151A GB3530564A GB3530564A GB1082151A GB 1082151 A GB1082151 A GB 1082151A GB 3530564 A GB3530564 A GB 3530564A GB 3530564 A GB3530564 A GB 3530564A GB 1082151 A GB1082151 A GB 1082151A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- frequency
- changing frequency
- sequence
- components
- 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
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
- H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
- H04N11/165—Decoding means therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/08—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using sequential signals only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
- H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,082,151. Colour television. HAZELTINEAGA LABORATORIUM G.m.b.H. Aug. 28, 1964 [Oct. 5, 1963], No. 35305/64. Heading H4F. To suppress the colour flicker in a television receiver adapted for receiving a colour subcarrier in which the colour sequence is periodically changed, the chrominance or colour difference signal components having frequencies in the vicinity of odd multiples of half the colour sequence changing frequency are suppressed and/or the chrominance signal components having frequencies in the vicinity of even multiples of half the changing frequency are emphasized. A change in colour sequence may be represented as a change in polarity of the chrominance signal component Q o and if a phase error occurs in transmission, the sub-carrier F appears at the receiver in the following form: and by means of synchronous detection in the receiver there is obtained: in which the components # Q 0 sin α and Œ I 0 sin a of I and Q change polarity in synchronism with the colour sequence and cause colour flicker. The Specification states that it can be shown by means of Fourier analysis that the alternating components are grouped about odd multiples of one half of the colour sequence changing frequency, i.e. in the spaces between the frequency groupings of the other components. Since the sequence can only be changed in the synchronizing intervals the changing frequency is related to the line or the field frequency. A high degree of suppression may be obtained by a suppression of one-half the changing frequency and/or the third multiple thereof by means of frequency traps. The even multiples of half the changing frequency may be emphasized by means of filters. Instead of using traps or filters a quarter-wave transmission line tuned to one-half the changing frequency and terminated at one end by its surge impedance and being short-circuited or open-circuited at the other end may be used. The terminating impedance may serve as the cathode or anode load circuit of an amplifying stage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEH50468A DE1197920B (en) | 1963-10-05 | 1963-10-05 | Arrangement to suppress the color flicker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1082151A true GB1082151A (en) | 1967-09-06 |
Family
ID=7157386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3530564A Expired GB1082151A (en) | 1963-10-05 | 1964-08-28 | Arrangement for suppressing colour flicker |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT246243B (en) |
| DE (1) | DE1197920B (en) |
| GB (1) | GB1082151A (en) |
| NL (1) | NL6411574A (en) |
-
1963
- 1963-10-05 DE DEH50468A patent/DE1197920B/en active Pending
-
1964
- 1964-08-26 AT AT739064A patent/AT246243B/en active
- 1964-08-28 GB GB3530564A patent/GB1082151A/en not_active Expired
- 1964-10-05 NL NL6411574A patent/NL6411574A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AT246243B (en) | 1966-04-12 |
| NL6411574A (en) | 1965-04-06 |
| DE1197920B (en) | 1965-08-05 |
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