GB1064049A - Colour television system with sequential chrominance dot signal - Google Patents

Colour television system with sequential chrominance dot signal

Info

Publication number
GB1064049A
GB1064049A GB3246764A GB3246764A GB1064049A GB 1064049 A GB1064049 A GB 1064049A GB 3246764 A GB3246764 A GB 3246764A GB 3246764 A GB3246764 A GB 3246764A GB 1064049 A GB1064049 A GB 1064049A
Authority
GB
United Kingdom
Prior art keywords
colour
signal
signals
frequency
modulator
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
GB3246764A
Inventor
Milan Ptacek
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.)
VYZK USTAV ROZHLASU A TELEVIZE
Original Assignee
VYZK USTAV ROZHLASU A TELEVIZE
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 VYZK USTAV ROZHLASU A TELEVIZE filed Critical VYZK USTAV ROZHLASU A TELEVIZE
Publication of GB1064049A publication Critical patent/GB1064049A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00Colour television systems
    • H04N11/06Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

1,064,049. Colour television. VYZKUMNY USTAV ROZHLASU A TELEVIZE PRAHA. Aug. 10, 1964, No. 32467/64. Heading H4F. The invention relates to a colour television system in which the colour information carrying signals are transformed into a signal which is amplitude modulated in such a manner that the upper modulation envelope carries one colour carrying signal, and the lower modulation carries the other colour carrying signal, the signal being frequency modulated on to the usual subcarrier of frequency 4À43 Mc/s. and added to the luminance signal before transmission. In the transmitter, Fig. 4, the fundamental colour signals are directly used as the colour information carrying signals, although other signals may be used, e.g. colour difference signals. In matrix unit 1 the luminance signal E<SP>1</SP>y is formed and the signals E<SP>1</SP>R and E<SP>1</SP>B are passed through lowpass filters 2 and 3. In auxiliary modulator 5 ignals E<SP>1</SP>R and E<SP>1</SP>B modulate an auxiliary arrier of frequency approximately 1À4 Mc/s. so that its positive envelope is modulated with the signals E<SP>1</SP> R and its negative envelope with signal E<SP>1</SP> B , the signals being partially mixed in device 4 in order to pre-correct " cross-talk " which would occur during demodulation in the receiver. The output signal from modulator 5 then passes through low-pass filter 6 and is frequency modulated on to the main colour sub-carrier in modulator 7, and after frequency filtration in band-pass filter 8 is added in circuit 9 to the delayed luminance signal E<SP>1</SP>y to which has been added synchronizing signals Ess, to form the complete composite colour signal E<SP>1</SP> t . The output signal from modulator 5 is shown in Fig. 1d, the signal being switched over progressively over the colour picture elements between both colour carrying signals, e.g. A 1 (t) and A 2 (t) and being of the form (A 1 - A 2 )+(A 1 +A 2 ) cos w p t where W p is the angular frequency of the auxiliary carrier, i.e. 2#1À4 Mc/s., the upper side-band being partially limited. To obtain a compatible black and white picture the phase of the frequency modulated signal is periodically switched through 180 degrees for every line and frame. Modulator 5 comprises phase inverters, pushpull modulators, gated clamp circuits for D.C. restoration during the blanking pulses and an adding stage, Fig. 5 (not shown). In the receiver, Fig. 6, the colour sub-carrier is suppressed in the luminance channel by filter 1, the luminance signal being delayed in stage 2, and the frequency modulated colour sub-carrier is obtained by means of band-pass filter 3. After amplitude limitation in limiter 4 the subcarrier is rectified in frequency discriminator 5 to form the colour carrier signal and then demodulated in device 6, Fig. 7 (not shown), including two diodes polarized in opposition to each other and two low-pass filters. To restore the colour signals E1 R , E<SP>1</SP> G and E<SP>1</SP> B highfrequency components of the luminance signal E<SP>1</SP>y from band-pass filter 7 are added in a suitable ratio to components E<SP>1</SP>R and E<SP>1</SP> B before the signals are fed to matrix circuit 8.
GB3246764A 1964-08-07 1964-08-10 Colour television system with sequential chrominance dot signal Expired GB1064049A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6409094A NL6409094A (en) 1964-08-07 1964-08-07

Publications (1)

Publication Number Publication Date
GB1064049A true GB1064049A (en) 1967-04-05

Family

ID=19790742

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3246764A Expired GB1064049A (en) 1964-08-07 1964-08-10 Colour television system with sequential chrominance dot signal

Country Status (2)

Country Link
GB (1) GB1064049A (en)
NL (1) NL6409094A (en)

Also Published As

Publication number Publication date
NL6409094A (en) 1966-02-08

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