DE3447988C2 - Method for transmitting a color television signal in time and frequency division multiplex - Google Patents

Abstract

To transmit a color television signal that contains a luminance signal component and a modulated color carrier, only the luminance signal with the full bandwidth of the transmission channel is transmitted during any line and a frequency multiplex is transmitted during the next line, which consists of the luminance signal reduced in bandwidth and the modulated color carrier . The high-frequency luminance signal components and the modulated color carrier are thus transmitted in time division multiplex. A color sync signal (burst) is also transmitted in each line. On the receiver side, the undelayed, broadband luminance signal component and the broadband luminance signal component delayed by a full image are used as the luminance signal, alternating between lines.

Description

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^ Restore templates. The low-frequency components

· "* VV are not evaluated in this case. These are

if this is only required for a different type of luminance

^ * gnal processing in the receiver according to DE-PS

'' ■ 33 38 192 or also for compatible reception with a

~ in a standard PAL receiver.

"'; The result is based on the reproduced location fre-

¹ ^ sequence level according to FIG. 3 illustrates how from this

ζΐ can be seen, there is cine complete dissolution in all

ν directions.

For this purpose 3 sheets of drawings

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Claims (1)

1 2 Line the color and only every other line the full one Claim: luminance bandwidth sent This means that the high-frequency luminance signal components and the Method for the transmission of a color television modulated color carrier (PAL color signal) in time-division multiplex and frequency-division multiplex, which are transmitted plex. Optionally, this line-to-line luminance signal component and a modulating transmission can take place in such a way that the phase data contains color carriers in which, during any line of switching between color and luminance signal, only the luminance signal with the full image at the beginning of each frame is the same (full screen bandwidth of the transmission channel and select reset) or switch from full screen to full screen
At the end of the next line, a frequency multiplex is transmitted in the receiver for line 1, which is made up of the luminance signal in the band; the luminance signal of the time width reduced luminance signal and the mo- Ie 2 is composed according to DE-PS 33 38 192 composed of dulated color carriers, whereby together with the low-frequency components of line 2 and the broadband luminance signal and the high-frequency components of the previous quenzmultiplex a Color sync signal (burst) with is line 1. As far as the color is concerned, it is transmitted in Zei, characterized in that Ie2 the signals transmitted in this line with a line-wide-over-bandwidth of z. B. 1.3 MHz 6 dB. In the intermittent, the undelayed, broadband luminance signal following line 3, in which no color is sent density signal component and which is sent by a whole, the color of the previous line 2, delayed broadband luminance signal component is simply repeated by removing the high-frequency component . Luminance components in every second cell result in of which a reduced resolution of the luminance resistance gnals in a diagonal direction, creating certain disruptive structures be evoked. 25 The object of the invention is to provide a method The invention relates to a method according to Ren of the type mentioned to the effect to verbesdem preamble of the superordinate claim 1. A sern that the obpn-mentioned disturbance structures receiver-like method is from the older DE-PS at least for stationary or slowly moving 33 38 192 known (hereinafter referred to as the I-PAL system, images are compensated,
draws). 30 According to the invention, the task is accomplished by the characteristic Solved due to the need for a compatible characterizing feature of the claim
speed with monochrome signals are in the opposite The invention will be explained in more detail with reference to the drawings Feinsehs ^ systems currently used PAL, MTSC and explained It shows SECAM the luminance component and the two F i g. 2 is a block diagram of a receiver-side Color components transmitted in frequency division multiplex. 35 device for restoring the resolution of this has the result, as is known, that when reproducing the luminance signal in the diagonal direction, and
crosstalk effects in a color receiver (cross-co- Fig. 3 which with the help of the device according to Fig. 2 re lour, cross-luminance) occur, which affect the image quality produced spatial frequency level,
affect. In addition, the tape solution is also illustrated in FIG. the width of the luminance signal regions The eliminations 40 preparation used in this task solution discrimination of these effects is particularly desirable, the V-signal in the transmitter provides for a larger zeilenalfalls in future screens for use grain-ternierend switched switch 130 once the tiefmen. frequency components Yt of the luminance signal Y (low When designing an improved remote transmission pass 110) and on the other hand, the following points 45 equal to Δτ delayed delay element 120, must be taken into account : Adaptation of the signal to the constant luminance signal Y must be supplied. On the current transmission characteristics (HF transmission transmission path 140 are thus in the one supply, cable transmission, recording on Vicleorecor line, the luminance signal Kwith the full bandwidth) as well as compatibility with already existing te and in the next line that of its high-receiving devices. It is also desirable that the luminance signal Yr freed from 50 frequency components is upwardly compatible in the sense that it is transmitted. improved system also signals of the existing system processing of the transmitted luminance can process, d. gnals stored on magnetic tape in the receiver is done in such a way that a Productions, alternating between lines, working synchronously with counter 130- A color television transmission method that meets the requirements called the changeover switch 170 on the one hand, the instant signal, practically no over- (via line 160) and on the other hand only shows full speech effects and is delayed in the horizontal direction of a frame period (624 lines) (frame storage improved resolution of the luminance signal delivers 150) signal. The line periodic is described in the older DE-PS 33 38 192. The changeover of the changeover switch 170 takes place continuously; the basic idea of this improved method is based on 60, ie without the same phase setting of the changeover switch 170, of the spectrum according to FIG. 1 illustrates. In line 1 at the beginning of each frame. This ensures that a broadband luminance signal is transmitted behind the frame memory, always exclusively broadly together with the normal PAL burst (no high-bandwidth signals are read out. The frame storage chrominance information). In line 2, the lower frequency 150 »gets« the broadband luminance information missing in every second line of the luminance signal 65 (2.9 MHz 6 dB), the normal PAL color signal and also the previous full image. In this way the normal PAL burst can be transmitted. This change in the resolution of the luminance signal in I-PAL is repeated continuously. So there will only be every other diagonal direction for standing and slow moving