JPS59219083A - Television picture signal transmission system - Google Patents

Abstract

PURPOSE:To reduce a required signal transmission band width by forming a sum signal and a difference signal based on a television picture signal, and transmitting the signals while applying time division multiplexing and time axis comprssion to them. CONSTITUTION:the sum signal is formed by adding picture signals at two adjacent scanning periods of a television picture signal by an adder 11 mutually. Similarly, the dfference signal is formed by subtracting mutually the picture signals by a subtractor 12. The sum signal and the difference signal are arrange in time series at a unit time comprising two scanning periods and transmitted successively. The frequency ban width of the difference signal is narrowered less than the frequency band width of the sum signal and also the difference signal is transmitted while compressing the time axis. In such a transmission, the required signal transmission band width is reduced.

Description

[Detailed Description of the Invention] Technical Field The present invention is applicable to television screens such as color television.
Regarding a type of television image signal transmission system that applies time axis compression and time division multiplexing to a television image signal and transmits the image signal, 'l?
Furthermore, it is possible to reduce the required transmission bandwidth, which has traditionally been a drawback of this type of transmission system.

-・This type of method, that is, the so-called TOI
CTime Compressed Integrat
, ion ) system color television image (image signal transmission, the two-dimensional spatial characteristics of vision are effectively used, and the original signal bandwidth of each signal is not increased. Since each signal of Gw and narrowband color signal CN can be transmitted in the hourly publication Tatsumi Mitsu color image 1 blue report, there is no crosstalk between the bright 1f signal Y and each color color signal C, and The present invention has the advantage that signal processing for improving the signal-to-noise ratio as described later becomes easy, and highly efficient television image signal transmission such as satellite broadcasting of high-definition television becomes possible.

However, as will be explained in detail later, when time-division multiplexing each component signal, time axis EE processing is applied in inverse proportion to the signal bandwidth of each component signal, so the baseband bandwidth of each component signal is significantly reduced. This has the disadvantage that the required signal transmission bandwidth increases significantly.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, reduce the required signal transmission bandwidth, and efficiently apply time axis compression and time division multiplexing to each component signal of a television image signal. The goal is to provide a transmission method.

That is, in the television image signal transmission system of the present invention, the sum signal obtained by mutually adding the image signals of two adjacent scanning periods of the television image signal and the image No. 43 are reduced reciprocally.
A frequency band of the difference signal is formed, and when the difference signal is arranged in time series for each unit period consisting of a '42 scanning period and transmitted sequentially, the frequency band of the difference signal is The width is narrower than the frequency bandwidth of the sum signal, and at least the time axis of the difference signal is compressed and transmitted.

EXAMPLES Below, the present invention will be described in detail by way of examples with reference to the drawings.

First, the general configuration of an image pickup output signal conversion system in a general color television signal system is shown in Figure 1. In the illustrated 4-4 configuration, eight primary color image signals R, G, and B are output from a color television camera 1 for one image.

In order to efficiently transmit the color image information, matrix rotation il! Lead me to 12iz,
Luminance A and Y and two types of color signals: I and Q signals in the NTSG system, R-Y and B-Y signals in the PAL and SEOAM systems, and Cw and CN in the high-definition television system. Convert each to a signal.

The signal waveforms of the above-mentioned component signals in the high-definition television system that is the subject of the present invention, that is, the luminance signal Y1, the wideband color signal CW, and the narrowband color signal ON, are shown in FIG.
They are shown in a-1), (b-1), and (c-1), respectively.

Therefore, in the configuration shown in the first diagram, when the component signals Y, GW, ON are guided to the TCI signal converter 8 and time-division multiplexed, the 21st jlJ(a-2) is used.

(b-z), (c-2) As shown in VC,
Each component signal Y, Ow, ON is subjected to time-axis compression in inverse proportion to its respective signal bandwidth, and then time-division multiplexed to create each time-axis compressed component as shown in FIG. 2(d) or (el K). A time-division compression multiplex signal, that is, a TC signal, is formed by combining the signals Y', OW', and OH'.

In addition, the VC in FIG. 2(a) has the respective time axis compressed component signals y/, c, I! at one line thread position. 7, shows the TCI-LO fold signal combined with cN/silk, and Fig. 2 (e
lK indicates a TCI-LSC signal obtained by multiplexing two types of time-domain compressed color signals Cw' and CN' alternately for each line and multiplexing the time-domain compressed luminance signal Y' into 111μ lines.

The general TO multiplier signal signal bandwidth fb as described above is the W degree signal Y, the wideband chrominance signal C, the narrowband telegraph f, -fy
+f. w + f (3N (11). In other words, in high-definition television system, fY = 20MH2, fcw = 7.0MH2, fcN
= 5.5 MH2, so fb = 82.5 MH
z, and the required signal transmission bandwidth increases significantly. In addition, at the last moment, the horizontal retrace period etc. are narrower than in the standard method.

Therefore, the bandwidth is narrower than this, but in any case, the drawback of the conventional '1ICI method is that the baseband bandwidth of the transmission signal increases significantly.

FIG. 8(a) shows an example of a schematic configuration of an imaging output signal conversion processing system according to the transmission system of the present invention, which eliminates such conventional drawbacks. In the illustrated configuration, the luminance signal Y in line units or frame units is
Y□, Y, , ¥8. -... and a h L, the second-order Hadamard transform signal by the equation (2) -14H□, I (
form 2.

That is, the circuit configuration shown in MRIt(a) is a second-order Hadamard transform signal forming circuit, which includes a line or frame delay circuit corresponding to the television scanning period, an lO1O multiplier 11, a subtractor 12, and a low-pass P waveform generator 18. The second-order Hadamard transform signal formed by the combination of ++H1+ H2
are alternately taken out by the switcher 14 of the television scanning period Jυ1. That is, in the image signal changing circuit shown in FIG.
．． .
From 2 to the same figure (dl), the Hadamard transform signal H2 is
When the delay circuit 10 consists of a line memory, the switcher 14 alternately switches off the change/displace signals H, H2 at the line period, or at the frame period when the delay circuit 10 consists of a frame memory. Finally, f of the waveform shown by Ic
A converted output signal g° for transmission is outputted as JJ'M. In addition, the same figure (f
) K is the same as 1% (cl and (dt
The conversion signal ■□, H2 shown in the figure is given a value of 1 (to the conversion signal H2 in the signal waveform shown by eHc, the DC component, that is, the amplitude of the conversion signal + "FH□)" By doing D(I, the amplitudes of the strange and fallen signals H□ and H2 fall within the same level range 1, and 1i711<
(As shown in el VC, this is to prevent the level of the B signal from shifting.

Therefore, when the line period is a unit period J, (the phase of the luminance signal of two periods of twinkling
? -le conversion signal H0 is the detailed lI! of the image 1p in the horizontal direction. It is a signal component that provides IJ image information, and corresponds to the original signal band JX1. The Hadamard transform signal ■, which consists of the difference Y□−Y2 between the luminance signals of 1 phase and 2 hard iiJ], is a signal component that provides detailed image information even in the vertical direction of the image. Therefore, the signal bandwidth can be narrowed. Therefore, Fig. 2 (a-1
) [Actual output luminance signal Y construction.

Y2. Y8. . . . from the time axis compressed luminance signal Y' + Y2' g YB' + shown in Fig. 2 (a-2).
In the time axis compression process to obtain ..., it is possible to reduce the time axis compression rate of R[W signal sum Y, + Y, and increase the time aII compression rate of the luminance signal difference Y□-Y2. .

Also, Hadamard transform signals H□, H2 in line period units
In this case, since the signal bandwidth of the converted signal H2 is obtained, the signal bandwidth of the converted output TCI signal for transmission can be reduced accordingly. FIG. 4 shows an example of the configuration of a TGI signal according to the present invention, which is constructed by skillfully utilizing the properties of the converted output signal obtained by subjecting the luminance signal Y to second-order Hadamard transformation.

That is, in the TCI signal with the illustrated configuration, i
) The converted signal H0 is converted into a signal with a small pressure of time Φ + Y2
)'/2 11) Signal (Y14) //, which is obtained by compressing the time axis of the converted signal H2 at a high compression rate.

1ii) Type 2 fR time 1t-II E line color signal O
y7', ON'wo2 The TOIO number shown in the 41st section 1 is time-division multiplexed in the line period, that is, the improved TO multiplication signal (I). Regarding the television system, it will be like Josutogi.

As an example of numerical values obtained based on the above, the improved TOIO formula according to the present invention is compared to the conventional TOI −
Compared to the LSC method, the compression ratio η of the required signal transmission bandwidth is as follows, which reduces the required signal transmission bandwidth/]''-28%. Also, compared to the TOI-LG method, η=17・
8/26. g = 0.641, resulting in a reduction in the required signal transmission bandwidth of 86%.

In addition, in FM transmission of surface-quality television image signals, in order to effectively utilize the transmission band 11, the most important issue is to compress the baseband signal (1) bandwidth. The transmission signal format based on the system is extremely effective.

Figures 5 and 6 show other examples of the transmission signal format according to the transmission system of the present invention, which is advantageous in that the transmission bandwidth is reduced by 131 in the transmission of television picture I visual information using the TCI system. These are shown in Figure 1. In other words, in the transmission system of the present invention, the table is expressed in the form (Y1+Y2)'/2.
Component signals other than the two-dimensional Hadamard transform value H□, that is, the transform signal H2 and two types of time axis compression telegraph +
Both +Cw' and CN' are signals that do not have a DC component, that is, signals that exhibit both positive and negative (positive and negative) polarity. 0 of component signal H3°Cv,',CN'
The level is concentrated in the frequency region corresponding to the level of the peak value amplitude of the converted signal H□. On the other hand, regarding the converted signal H□, as shown in FIG.
The energy of the waves is concentrated.

Therefore, if the polarity of the smart signal H in the form (Yl+Y2)//2 is reversed every 2-line period or z-frame period, the FM for the frequency/domain corresponding to the O level of the TOIO signal will be wave energy 1
4% is recycled, and the converted signal H□ also has the same properties as the above-mentioned converted signal H2, that is, the distribution characteristics of FM wave energy.

In this way, it is possible to transmit a high-definition television image signal without concentrating the energy of the FM wave in a frequency region corresponding to a specific signal level of the transmission signal. This means that there will be less interference with the communications of the angels who carry out their mission, so it is more suitable as a signal format for use in high-definition television broadcasting.

As shown in Fig. 4, the Hadamard transform signals H, H2 and VC2 are calculated for each unit period of 2 line period or 2 frame period.
FIG. 6 shows the transmission signal format according to the transmission method of the present invention when different types of time-axis compressed color signals CW' and CN' are transmitted. The two types of time-base compressed color signals Cw' and CN' are transmitted alternately, but each of these transmission signal formats is different from the modified T
The purpose of FM transmission of the OI signal is to avoid the above-mentioned concentration of energy in the channel and to disperse it. 't, that is, the transmission values shown in Kame5shi1(a) and Kame61fa) In the format, the Hadamard transformation signals H□, H2 and z7i'6 river (7) time 1i411M+pressure 1 (& color signal Cν, ′, (J
N'] has reversed the heteno polarity, and the
bl and FIG.
σ) Only the four obsessions are alternately reversed.

As mentioned above, if the baseband signal format of the high-definition television signal according to the transmission system of the present invention is used, it is possible to use the high-definition television signal in the baseband signal format efficiently, and also to be able to use other communication channels using adjacent channels. Develop a high-definition television broadcasting system with less interference.

As is clear from the above explanation of effects, according to the present invention, Television II! ii) A second Hadamard transformation is applied to the lines 1 and 14g of the mutually compatible line period or frame period of the 1st-order signal, and the converted output is the low frequency component of the 1g signal.
- Utilizing the property that the joint sensitivity to the high frequency component H2 is lower than that of the H-type, the signal transmission band of the converted output high-frequency component H2 is reduced, and the Hadamard transform output signal H, l (Since time-division multiplexing is performed by combining 2 with the time-base color reduction signal for transmission, the transmission signal bandwidth does not increase significantly as in the past, and the time-base of the high-definition television image signal A compressed and time division multiplexed transmission signal can be formed.

In high-definition television satellite broadcasting, it is necessary to reduce the required transmission bandwidth as much as possible and use a signal format that can undergo extensive signal processing for FM transmission. The time-curved axis compressed/time-division multiplexed I# transmission signal is a transmission signal format suitable for use in this type of high-definition television satellite broadcasting that will be put into practical use in the future.In this respect, the effects of the present invention are remarkable. It is.

[Brief explanation of drawings]

The first part is a block diagram showing the schematic configuration of a color television signal conversion system, Part 21A (a-1), (b-1), (c-1
); (a-2). (b 2 ) + (c 2 ) r arrangement K(d),
(el is a waveform indicating each original signal component, time ml (compressed signal component and time axis compression/time division multiplexing i) signal waveform of the signal in the conventional time axis compression/time division multiplexing (TGI) method. , Figure 3 (al and (bl to f) are block diagrams and signal waveforms 1) showing an example of the configuration of a picture signal conversion circuit according to the transmission method of the present invention, and the following steps of signal conversion, respectively. I. Fig. 4 is a signal waveform diagram showing an example of the structure of a time-base compressed, time-minute, and zero-captive image signal improved by the transmission method of the present invention. Transmission by the invention transmission method (waveform diagram showing examples of outside waveforms, No. 6)
Figures (at and tbl are waveform diagrams respectively showing other examples of the transmission signal waveforms. l...Color television camera 2...Matrix circuit 8...Time axis 1k 8m/time division multiplexed signal converter io
... Eclipse JJI delay circuit 11 ... Kahiko device 12.
... Subtractor 13 ... Low-pass F-wave unit 14
...Switcher. Patent applicant: Japan Broadcasting Corporation Figure 4 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] L A phase signal obtained by mutually adding τT of image signals of two adjacent scanning periods of a television image code, and a difference signal obtained by subtracting the image signals from each other are formed. Then, when arranging the sum signal and the difference signal in time series for every period of 1 bit from 2 scanning periods and transmitting them sequentially at 1 fCbs, the frequency bandwidth of the difference signal is set to the frequency bandwidth of the d11 phase signal. 1. A television picture 1 image signal@transmission system characterized in that the time u1 of the difference signal is made narrower and at least the time u1 of the difference signal is compressed and transmitted. a) In the transmission system according to claim 1, among the image signals consisting of a reliability signal and a color signal, 1) l
[Note I] Generate a luminance phase signal corresponding to the sum signal and the difference signal respectively for the intensity signal, and generate a running signal, and set the time axis for the previous 11 chrominance signals, The 719 degree phase signal and the luminance difference 11
A television picture (fJ signal transmission method) characterized in that the color signal and the time-axis compressed color signal are arranged in chronological order for each of the nesting periods and transmitted sequentially. In the transmission method according to item 2, with respect to the color signal consisting of a wideband color signal and a narrowband color signal, the wideband color signal and the narrowband color signal are arranged in time series for each unit period and transmitted. A television troublesome signal transmission system characterized in that: In the transmission system according to claim 1, the color signal consisting of a wideband color signal and a narrowband color signal is A television picture single image signal transmission system, characterized in that the broadband color signal and the 1C narrowband color signal are alternately transmitted for each period. 2. The television double-image signal transmission method according to 1., wherein the transmission method is characterized in that the polarity of the signal is alternately inverted and transmitted to the Jυ” quantity valve of the unit.