GB1058604A – Improvements in or relating to colour television systems
– Google Patents
GB1058604A – Improvements in or relating to colour television systems
– Google Patents
Improvements in or relating to colour television systems
Info
Publication number
GB1058604A
GB1058604A
GB744064A
GB744064A
GB1058604A
GB 1058604 A
GB1058604 A
GB 1058604A
GB 744064 A
GB744064 A
GB 744064A
GB 744064 A
GB744064 A
GB 744064A
GB 1058604 A
GB1058604 A
GB 1058604A
Authority
GB
United Kingdom
Prior art keywords
chrominance
chrominance signal
colour
signal
carrier
Prior art date
1963-03-01
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
Application number
GB744064A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
Priority date (The priority date 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 date listed.)
1963-03-01
Filing date
1964-02-21
Publication date
1967-02-15
1964-02-21
Application filed by Telefunken Patentverwertungs GmbH
filed
Critical
Telefunken Patentverwertungs GmbH
1967-02-15
Publication of GB1058604A
publication
Critical
patent/GB1058604A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H04N11/143—Encoding 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
H04N11/12—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
Abstract
1,058,604. Colour television. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Feb. 21, 1964 [March 1. 1963], No. 7440/64. Heading H4F. In a colour television system there is transmitted a luminance signal and a chrominance signal produced by quadrature amplitude modulation of a colour carrier wave by two colour-difference signals, the direction of the phase modulation of the chrominance signal being reversed at line frequency, and one of the side bands of the chrominance signal being attenuated or suppressed, whilst at a receiver for the system means are provided for respectively adding and subtracting the chrominance signal relating to corresponding points in successive line periods, whereby to derive outputs which when demodulated represent respectively the colour-difference signals without substantial cross-talk due to the attenuation or suppression of the pass band. The reversal of the direction of phase modulation may be effected in the manner described in Specification 1,005,855, e.g. by switching by 180 degrees the modulation axis of one of the colour difference signals. The chrominance signal is modulated with carrier suppression. The attenuation or suppression of the chrominance pass band is effected by a filter included either in the chrominance channel or in the channel for the combined luminance and chrominance signal. The latter method is preferred with the chrominance carrier located at the upper extremity of the luminance band and the filter having a Nyquist flank with the carrier frequency located at the minus 6 db. point. Reference is made to the transmission of the chrominance signal with enhanced amplitude to improve signal-to-noise ratio but at the cost of some measure of compatibility. Reference is also made to the use of filters in the receiver. The receiver’s operation is based on a one-line-duration delay line through which the received chrominance signal is applied to two adding stages, the signal also being applied directly to one stage and via a 180 degrees phase reverser to the other. In addition, the adding stages also receive reference oscillation at chrominance carrier frequency, the phase of the oscillation applied to one stage being in quadrature with that applied to the other and also being subjected to 180 degrees phase reversals at line frequency. The outputs of the adding stages are applied to conventional amplitude demodulators to obtain the colourdifference signals.
GB744064A
1963-03-01
1964-02-21
Improvements in or relating to colour television systems
Expired
GB1058604A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DET23544A
DE1187672B
(en)
1963-03-01
1963-03-01
Color television system
Publications (1)
Publication Number
Publication Date
GB1058604A
true
GB1058604A
(en)
1967-02-15
Family
ID=7551039
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB744064A
Expired
GB1058604A
(en)
1963-03-01
1964-02-21
Improvements in or relating to colour television systems
Country Status (7)
Country
Link
AT
(1)
AT242208B
(en)
BE
(1)
BE642689A
(en)
DD
(1)
DD44753B1
(en)
DE
(1)
DE1187672B
(en)
GB
(1)
GB1058604A
(en)
NZ
(1)
NZ137452A
(en)
SE
(1)
SE315626B
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3707596A
(en)
*
1969-12-19
1972-12-26
Philips Corp
Circuit arrangement for surpressing the chrominance subcarrier in pal signal
US4984093A
(en)
*
1987-09-17
1991-01-08
Deutsche Thomson-Brandt Gmbh
Video recorder with increased bandwidth recording
US5077616A
(en)
*
1987-09-29
1991-12-31
Deutsche Thomson-Brandt Gmbh
Video recorder with increased bandwidth recording
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2735886A
(en)
*
1956-02-21
Color television system
FR954609A
(en)
*
1946-10-30
1950-01-04
US2793348A
(en)
*
1952-01-14
1957-05-21
Rca Corp
Modulation system for color phase alternation
0
NZ
NZ137452D
patent/NZ137452A/xx
unknown
1963
1963-03-01
DE
DET23544A
patent/DE1187672B/en
active
Pending
1963-12-06
AT
AT980863A
patent/AT242208B/en
active
1963-12-10
DD
DD10187163A
patent/DD44753B1/en
unknown
1964
1964-01-15
SE
SE49464A
patent/SE315626B/xx
unknown
1964-01-20
BE
BE642689A
patent/BE642689A/xx
unknown
1964-02-21
GB
GB744064A
patent/GB1058604A/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3707596A
(en)
*
1969-12-19
1972-12-26
Philips Corp
Circuit arrangement for surpressing the chrominance subcarrier in pal signal
US4984093A
(en)
*
1987-09-17
1991-01-08
Deutsche Thomson-Brandt Gmbh
Video recorder with increased bandwidth recording
US5077616A
(en)
*
1987-09-29
1991-12-31
Deutsche Thomson-Brandt Gmbh
Video recorder with increased bandwidth recording
Also Published As
Publication number
Publication date
AT242208B
(en)
1965-09-10
NZ137452A
(en)
BE642689A
(en)
1964-05-15
DD44753B1
(en)
1980-06-25
SE315626B
(en)
1969-10-06
DE1187672B
(en)
1965-02-25
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