EP0447473A1 - Systeme d'emission de television en couleurs - Google Patents

Systeme d'emission de television en couleurs

Info

Publication number
EP0447473A1
EP0447473A1 EP90900842A EP90900842A EP0447473A1 EP 0447473 A1 EP0447473 A1 EP 0447473A1 EP 90900842 A EP90900842 A EP 90900842A EP 90900842 A EP90900842 A EP 90900842A EP 0447473 A1 EP0447473 A1 EP 0447473A1
Authority
EP
European Patent Office
Prior art keywords
additional information
color
information
transmission system
receiver
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.)
Ceased
Application number
EP90900842A
Other languages
German (de)
English (en)
Inventor
Martin Plantholt
Erich Geiger
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt 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
Priority claimed from DE3841073A external-priority patent/DE3841073A1/de
Priority claimed from DE3926388A external-priority patent/DE3926388A1/de
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0447473A1 publication Critical patent/EP0447473A1/fr
Ceased 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
    • H04N11/16—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
    • H04N11/167—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 a resolution-increasing signal being multiplexed to the PAL-system signal, e.g. PAL-PLUS-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/24—High-definition television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/007—Systems with supplementary picture signal insertion during a portion of the active part of a television signal, e.g. during top and bottom lines in a HDTV letter-box system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

Definitions

  • the invention relates to a color television transmission system.
  • the invention is based on the object of specifying a compatible transmission system for a PAL signal, which has an image format of 4: 3 for standard receivers, which, as in the 'letter box' method, can also be only partially filled, and an image format of for improved receivers 16: 9, especially with a visual horizontal resolution corresponding to the 4: 3 format.
  • the additional information representing the larger picture format of 16: 9 is modulated onto the color information U and V transmitted in the PAL signal.
  • a type of modulation is selected by which the spectral spaces of the color information U and V are occupied twice. This can be done, for example, by quadrature modulation.
  • a standard receiver that contains the color information U and
  • An improved receiver with an aspect ratio of 16: 9 contains a corresponding decoder which, together with the decoder for the standard signal, provides an aspect ratio of 16: 9.
  • the horizontally high-frequency luminance signal components which are missing due to the image format expansion can be separated from the total luminance information and also the color information U and
  • V can be modulated.
  • Fig. 2 spectrum of a PAL signal in the plane of vertical spatial frequencies fy and temporal frequencies ft (based on active line numbers) block diagram of a wide-screen PAL encoder representation of the aspect ratios 4: 3 and 16: 9
  • Luminance resolution of the 16 9 edge information Time-division multiplex (Timeplex) packets for a first embodiment
  • Fig. 7 time division packets for a second
  • Embodiment Fig. 9 block diagram of a wide-screen PAL decoder Fig.10 arrangement for assembling
  • FIG. 1 and 2 show the spectral positions of luminance and chrominance for an NTSC and a PAL signal in the fy-ft level. From Fig. 1 and 2 it can be seen that there is a fundamental difference in the color transmission in NTSC and PAL. Due to the line-alternating switching phase of the V signal in the PAL system, the U and V signals of the PAL system do not occupy the same places in the spectrum as is the case with the I and Q signals of the NTSC system . According to the invention, these spectral spaces are therefore occupied twice in the PAL system with the additional information of the 16: 9 edge signals by modulating an additional signal in quadrature onto the color carrier.
  • This color television system hereinafter referred to as' wide-screen PAL 1 , enables the encoding / decoding and PAL-compatible transmission of 16: 9 picture signals and offers the following advantages: - good compatibility with the conventional PAL receiver
  • the conventional PAL receiver supports the suppression of by notch filtering in the luminance path
  • Fig. 3 shows a wide-screen PAL encoder.
  • Signals with a 16: 9 aspect ratio can be considered as source signals. These signals can come from a progressive scan or an interlaced scan (e.g. 1250/50/1: 1, 1250/50/2: 1, 625/50/1: 1, 625/50/2: 1, 525/60/1: 1 or 525/60/2: 1).
  • For other source signals that do not correspond to the transmission standard must be provided by a corresponding transcoding ensure that a corresponding to the transmission standard 'signal of the processing is available.
  • the information of the color separations R, G, B to be processed with an aspect ratio of 16: 9 on a 625 line basis is first converted in a matrix 1 into the luminance component Y and the two color components U and V.
  • These 16: 9 component signals are then split in a separator circuit 2 into the signals of the 4: 3 center information and into the 16: 9 edge information, as shown in FIG. 4. Since the 4: 3 center information only makes up 3/4 of the 52 ⁇ s of an active line, this signal must be expanded by 4/3 in time in order to generate a signal that is compatible with the standard receiver and has the correct geometry. This is effected by an expansion circuit 3.
  • a conventional notch filter 4 can then be inserted into the luminance path Y. Avoid cross-color interference.
  • the chrominance signals U and V are pre-filtered in a low-pass filter 5 for horizontal frequencies fx, for example to 1.3 MHz (-3 dB) (according to CCIR recommendations).
  • a vertical low-pass filtering 6 of the vertical frequencies fy is then carried out, which limits the vertical resolution of the chrominance signals to 72 c / ph (vibrations / image height). This means that the vertical color resolution is the same as for MAC signals (MAC: multiplexed analogue components).
  • MAC multiplexed analogue components
  • the chrominance signals thus pre-filtered are then fed to a conventional PAL modulator 7.
  • the output signals of this PAL modulator 7 are the chrominance signals Uf and Vf quadrature-modulated with the PAL color carrier, which together with the time-adjusted 8 signal in a delay circuit 8 and e.g. a standard sync signal form a conventional composite signal. These signals are combined in a summation circuit 9.
  • the PAL modulator 7 uses an O-degree phase position of the color carrier for modulating the U component, which is referred to below as Fu, and the V-quadrature component, called Fv in the following, with +/- 90 degrees -Phase. Both color carriers Fu and Fv are led out of the PAL modulator 7 and are available for processing the wide-screen PAL signals.
  • the 16: 9 margin information takes up only 1/4 of the total line duration of 52 ⁇ s.
  • the luminance signal Y is first fed to an expansion circuit 10 and expanded in time by a factor of 4.
  • the signal then arrives at a Filter device 11, which generates the components Y1 and Y2, as shown in FIG. 5 for the non-time-expanded Y baseband signal.
  • the filter device 11 generates the signal Y2, which was limited to 72 c / ph for vertical frequencies and horizontally occupies a bandwidth of 1 MHz (baseband 4 MHz, FIG. 5) and the full transit time of a line.
  • the signal arrives at a time plexer 13, where, together with the chrominance information, packets of chrominance and luminance information are formed in time multiplex.
  • the chrominance signals of the 16: 9 edge information are expanded by a factor of 2 in a compressor / expander 14 and then pre-filtered in a horizontal low-pass filter 15 to, for example, 500 kHz base bandwidth (corresponding to 250 kHz after expansion).
  • the chrominance signals U and V then pass through a vertical filter 16, which limits the vertical resolution to 72 c / ph.
  • the time plexer 13 now selects the chrominance signals U and V and the luminance signals Y2 in the manner shown in FIG. 6.
  • the chrominance signals U and V each occupy 50% of the line time and the luminance signals Y 100% of the line time.
  • the luminance information Y2 is now fed to a linear modulator 17 which, as the modulation frequency, receives the color carrier Fu phase-rotated by 90 degrees in a phase shifter 18.
  • the chrominance information U and V are fed into a further linear modulator 19, which receives the color carrier Fv, which is phase-rotated by 90 degrees in a phase shifter 20, as the modulation frequency.
  • the color carrier-frequency signals are then fed to attenuators 21, 22, where the amplitudes can be reduced by a factor a ⁇ 1 in order to achieve better compatibility with the standard PAL receiver. Then the signals then arrive at the summation circuit 9 and are output with the Standard PAL coding combined into a compatible CVBS wide-screen PAL signal.
  • the vertical luminance resolution of the edge areas is increased.
  • the required components Y2, Yl ', U and V are combined in packets in the time plexer 13 in the manner shown in FIG.
  • the luminance component Y2 again takes up the full running time of a line, while the color components U and V each require 6.5 ⁇ s and the luminance component Yl 39 ⁇ s.
  • the broadband luminance component Y2 is in turn modulated onto the foot support in the linear modulator 17.
  • the filter device 11 again generates the components Y1 and Y2 according to FIG. 5.
  • the luminance component Y2 is limited to 4 MHz base bandwidth (1 MHz time-expanded) in a horizontal filter 11b.
  • the luminance component Y1 is shifted vertically by 72 c / ph by a converter 11c, so that the position of the vertical frequencies now extends from 0-72 c / ph.
  • the signal Yl ' is then obtained with a base bandwidth of 3 MHz (0.75 MHz time-expanded).
  • the chrominance information U and V of the 16 9 edge signals take up a total of 13 ⁇ s in the active line. These signals are time-compressed by a factor 2 by a compressor / expander 14 and then fed to the low-pass filter 15, which limits the baseband to 500 kHz horizontal resolution (1 MHz after compression).
  • the vertical filtering 16 then follows.
  • the information packets according to FIG. 7 are generated in the time plexer 13 (U / V, Y1 '). These packets are modulated onto the Fv ink carrier in the linear modulator 19.
  • the composite signal is first a conventional PAL demodulator 23 supplied, which supplies the component signals Y, U and V of the center information in 4: 3 format.
  • the chrominance signals U and V then pass through a vertical filter 34 and are low-pass filtered to 0-72 c / ph.
  • a runtime circuit 24 temporally adapts the Y, U and V signals to the 16: 9 edge information signals.
  • the CVBS signal passes through a bandpass 25, which has a minimum bandwidth of 2 MHz and whose center frequency is at the color carrier frequency.
  • a clock generation 26 recovers the color carriers Fu and Fv from the color burst contained in the CVBS signal, which are then fed to the 90-degree phase shifters 27 and 28.
  • the clock generation also receives the non-bandpass filtered FBAS signal for generating a line-synchronous control signal S.
  • the phase-shifted color carrier signals feed demodulators 29 and 30, which on the other hand receive the bandpass filtered FBAS signal.
  • the demodulated component signals then experience an increase with the factor 1 / a> 1 in accordance with the attenuation on the transmitter side in the amplifiers 31, 32.
  • the amplifiers are followed by vertical filtering 33, which limits the signals to 0-72 c / ph.
  • the signals arrive at a demultiplexer 35 and are separated according to luminance and chrominance signals.
  • a compressor / expander 36 compresses the chrominance signals for the first embodiment by a factor of 2 for the duration of the edge information, while the luminance signal is compressed by a factor of 4.
  • the signals are then available for reading out in a memory device 37 for the duration of one line.
  • a selector 38 is controlled via the control signal S and switches the YUV signals through to the dematrix 39 in the chronological sequence of edge information and center information, where they are converted into RGB signals.
  • the luminance information consists of the components Yl 'and Y2.
  • Fig. 10 5 shows an arrangement for assembling luminance components according to FIG. 5.
  • the receiver-side demultiplexer 35 supplies both Y component signals.
  • the Yl 'component is expanded in an expansion circuit 40 to the active line length of 52 ⁇ s and, after conversion to the vertical position of 72-144 c / ph, is added to the Y2 component in an addition circuit 42 in an addition circuit 42.
  • the luminance component according to FIG. 5 then results.
  • the chrominance components U and V which each only occupy 6.5 ⁇ s of the line duration, are expanded in the compressor / expander 36 by a factor of 2 to the duration of the marginal information.
  • the further processing of the YUV signals by the circuit parts 37-39 is carried out as described in the first embodiment.
  • the horizontally high-frequency luminance signal components which are missing due to an image format expansion are separated from the total luminance information and are also modulated onto the color information U and V.
  • the additional high-frequency luminum information Y * to be transmitted can be switched off with a circuit arrangement according to FIG.
  • the luminance Y is fed to a low-pass filter TP1 and the low-pass filtered luminance signal is then subtracted from the luminance signal Y, adapted by a delay circuit 110.
  • the corresponding spectral representation is shown in FIG. 12.
  • the frequencies selected by way of example in FIG. 12 advantageously meet the requirement for a luminance resolution that is increased by the ratio of the aspect ratios.
  • Judging from the luminance resolution of the digital studio according to CCIR-Rec. 601, which is specified with 6.75 MHz, and furthermore from a transmission channel with 5 MHz bandwidth, 5 MHz x (16: 9) / (4: 3) results in a value of 6.67 MHz for the total to be transmitted -Luminance signal bandwidth.
  • the edge of the low pass TP1 must be within the O dB bandwidth of the transmission channel and is, for example
  • Flank course does not necessarily correspond to a Nyquist flank.
  • Signal Y * according to FIG. 13a is shifted into the spectral position according to FIG. 13b by modulation with 6.75 MHz, for example.
  • the resulting portions at 13.5 MHz can either be filtered out by a low pass filter TP2 or by the
  • Transmission channel can be suppressed before the spectrum according to Fig. 13b e.g. by quadrature modulation of the
  • Fig. 13c is offset.
  • the carrier f * with a fixed phase and a phase switched by +/- 90 degrees consists of the two output signals of the phase shifters 18 and 19 in FIG. 3 of the first and second embodiment.
  • FIG. 13c shows that in the case of compatible transmission of the luminance component Y * with the bandwidth B (FIG. 13a), a transmission bandwidth of 2xB is required.
  • the indicated notch filtering 130 in the luminance branch of the standard PAL receiver shows that the additional luminance information is only slightly suppressed in compatible reception, so that Crpss-luminance interference can occur.
  • a further modulation with fsc * brings the spectrum according to FIG. 13c into a position as shown in FIG. 13d.
  • This position corresponds to the low-pass filtered signal according to FIG. 13b.
  • the signal spectrum according to FIG. 13d is put into a position according to FIG. 13e by renewed modulation at 6 ', 75 MHz.
  • a low-pass filter TP3 filters out the desired portion Y *, which is then converted to the broadband spectrum using the luminance spectrum transmitted in the baseband, ie in the original position Total spectrum Y (Fig. 12a) is composed.
  • Y * high-frequency U and V signal components can be processed and modulated onto the carrier of the V component as U * and V *.
  • FIG. 14 A second possibility of modulation and filtering for the compatible transmission and recovery of the luminance component Y * is shown in FIG. 14.
  • 14b can be filtered out by a low-pass filter TP4 or suppressed by the transmission channel.
  • 14c shows that only a bandwidth B is required for the compatible transmission of Y *, which is in the center of the notch filtering 140 of the standard PAL receiver. This advantageously largely suppresses cross-luminance interference in compatible reception.
  • f .. results if f .. represents a multiple of the color carrier frequency f (corresponds to the input signals of the phase shifters 18 and 19), because then the synchronization in the receiving device can be brought about via the color burst.
  • f .. can have the value (5/4) xf SC. If the band splitting according to Fig.
  • the ink carrier fSC can advantageously be used as a phase reference for joining the spectral components in the 16: 9 receiver.
  • a corresponding method for forming a phase reference is known from P 34 14 271.1.
  • Luminance component according to Fig. 2. The vertical resolution was limited to 144 c / ph, as the system theory (scanning theorem) allows for a 625-line interlaced scan.
  • the total spectrum of FIG. 15 can be divided into a component Y * and a component Y_ * by complementary vertical filtering. While Y .. * can be modulated directly in quadrature onto the U or V component of the PAL system due to the expansion from 0 to 72 c / ph, the component Y * (72 c / ph to 144 c / ph ) are first shifted in the vertical position so that this portion also comes in the position 0 to 72 c / ph and can thus be modulated to V or U.
  • a corresponding method has already been described for the second embodiment with reference to FIGS. 3, 5, 7, 8, 9 and 10 for Y2 and Yl '.
  • the additional information modulated in quadrature onto the U and / or V component can consist of an auxiliary signal that supports a progressive display in the receiving device.
  • a progressive display naturally avoids the flickering effects (25 Hz flickering) and the line wandering of the interlace system and thus to a better one visual vertical resolution leads.
  • ACTV Advanced Compatible Television - Proposal for a new, compatible widescreen television standard for the USA
  • H. Weckenbrock and W. Wedam television and cinema technology, 42nd year, No. 7/88
  • the progressive display with the aid of an additional signal that has been modulated onto the color carrier, as described for the other embodiment, can be carried out for 4: 3 standard receivers,

Landscapes

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

Abstract

Dans un système d'émission de télévision en couleurs selon la norme NTSC, des trous dits de ''Fukinuki'' dans le spectre ainsi qu'une région d'analyse dépassante des tubes servent à transmettre de manière compatible des informations de bords d'un format d'image 16:9. Une image active d'un format de 16:9 est transmise dans le cadre d'un format 4:3, avec une définition horizontale visuelle réduite en conséquence, par le procédé dit ''de boîte à lettres''. Lors de la transmission des signaux de télévision d'un format d'image 4:3, en vue d'une réception sur un récepteur standard ainsi que de données supplémentaires pour un format d'image 16:9 en vue d'une réception par un récepteur qui décode ce format d'image, ou bien lors de la transmission de signaux de télévision par le procédé ''boîte à lettres'', les informations supplémentaires étant constituées de fractions spectrales supérieures complémentaires produites dans l'émetteur, les informations supplémentaires sont modulées pendant un signal PAL sur les informations chromatiques (U, V) existantes dans ledit signal PAL, de telle manière que les espaces spectraux des informations chromatiques (U, V) soient comblés selon un mode double. Application à des récepteurs PAL d'un format d'image 4:3 et d'un format d'image agrandi 16:9.
EP90900842A 1988-12-07 1989-12-02 Systeme d'emission de television en couleurs Ceased EP0447473A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3841073A DE3841073A1 (de) 1988-12-07 1988-12-07 Farbfernsehuebertragungssystem
DE3841073 1988-12-07
DE3926388 1989-08-10
DE3926388A DE3926388A1 (de) 1989-08-10 1989-08-10 Farbfernsehuebertragungssystem

Publications (1)

Publication Number Publication Date
EP0447473A1 true EP0447473A1 (fr) 1991-09-25

Family

ID=25874867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900842A Ceased EP0447473A1 (fr) 1988-12-07 1989-12-02 Systeme d'emission de television en couleurs

Country Status (9)

Country Link
EP (1) EP0447473A1 (fr)
JP (1) JPH04502243A (fr)
KR (1) KR910700592A (fr)
CN (1) CN1015858B (fr)
AU (1) AU4820890A (fr)
HU (1) HUT60082A (fr)
MY (1) MY104281A (fr)
PT (1) PT92500A (fr)
WO (1) WO1990006658A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9123004D0 (en) * 1991-10-30 1991-12-18 British Broadcasting Corp Improvements in television systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59171387A (ja) * 1983-03-18 1984-09-27 Hitachi Ltd テレビジヨン信号の構成方法
DE3414452C1 (de) * 1984-04-17 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur kompatiblen Übertragung eines Farbfernsehsignals mit Zusatzinformationen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9006658A1 *

Also Published As

Publication number Publication date
WO1990006658A1 (fr) 1990-06-14
CN1043419A (zh) 1990-06-27
HUT60082A (en) 1992-07-28
MY104281A (en) 1994-02-28
PT92500A (pt) 1990-06-29
CN1015858B (zh) 1992-03-11
KR910700592A (ko) 1991-03-15
HU900923D0 (en) 1991-07-29
JPH04502243A (ja) 1992-04-16
AU4820890A (en) 1990-06-26

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