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
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.)
Filing date
Publication date
Application filed by Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1058604A publication Critical patent/GB1058604A/en
Expired legal-status Critical Current

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
    • H04N11/143—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
BE477020A (en) * 1946-10-30
US2793348A (en) * 1952-01-14 1957-05-21 Rca Corp Modulation system for color phase alternation

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
DD44753B1 (en) 1980-06-25
NZ137452A (en)
AT242208B (en) 1965-09-10
SE315626B (en) 1969-10-06
BE642689A (en) 1964-05-15
DE1187672B (en) 1965-02-25

Similar Documents

Publication Publication Date Title
KR970700959A (en) LOCAL OSCILLATOR PHASE NOISE CANCELLING MODULATION TECHNIQUE Using Local Oscillator Phase Noise Canceling Modulation Technology
US4622694A (en) Transmission system for TV signals on radio links
US2378298A (en) Composite-modulation radio service system
GB1080535A (en) Apparatus for increasing the signal-to-noise ratio in electrical signal transmissionsystems
US3969762A (en) Secam color television receivers employing tunable notch filter in luminance channel
GB1125043A (en) Radio telegraph signal transmission
GB1125851A (en) Improvements in colour television transmitters
GB1058604A (en) Improvements in or relating to colour television systems
US2975234A (en) Multiplex transmission system for television signals
US3157875A (en) Moving target radar delay line filter
GB1066798A (en) Improvements relating to demodulating circuits for colour television receivers
GB1358551A (en) Demodulation system
GB1376296A (en) Secam decoder
IL42153A (en) Telecommunications systems
GB1117725A (en) Demodulating circuit for waves frequency modulated by signals of the video type
GB1316109A (en) Signal demodulator circuit for pal/secam decoders
GB1041726A (en) Improvements in colour television systems using at least one frequency-modulated subcarrier
JPS6340925Y2 (en)
GB991643A (en)
US3990104A (en) Circuit arrangement for amplitude controlling an NTSC chrominance signal with high noise immunity
JPS622849Y2 (en)
GB1502392A (en) Receiver for the reception of colour tv-signals
GB1198986A (en) Improved Colour Television Systems and Apparatus
GB1075124A (en) Improvements in receiving arrangement for the reception of colour television signals
GB1514557A (en) Colour television signal converter and process of conversion