JPS62173890A - Television signal processor - Google Patents

Abstract

PURPOSE:To transmit a laterally longer picture while maintaining the coexistence of an existing system by applying time base compression to a signal corresponding to the part displayed on the screen of an existing receiver and shifting the remaining parts to a frequency higher than that of a signal Q so as to multiplex it. CONSTITUTION:Among signals Y, I and Q obtained by image-picking up by a camera whose aspect is larger than that of an existing one, the signal corresponding to the part displayed on the screen of an existing receiver is subjected to time base extension by time base extension circuits 3, 6 and 9. Among the remaining signal components apart from the extended signal, the I and Q signal components are modulated by a balanced modulator circuit 12, added to the remaining Y signal component by an adder 13, and subjected to frequency compression by a time base extension circuit 14 and to frequency shift by a frequency converter 15. The shifted signal is added to the output of the circuit 9 by an adder 11, and modulated by a balanced modulator circuit 16 together with the output of the circuit 6, after which it is added to the output of the circuit 3 by an adder 17 and turns out to be a wide television signal 20. On the other hand, a decoding side executes the reverse processing of the above- mentioned, and a picture with a laterally longer aspect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a television signal processing device, and in particular, the current television system has an aspect ratio (horizontal to vertical ratio) of 4:
Generates a television signal that is suitable for transmitting scene information (transmission in a broad sense including recording, etc.) with an aspect ratio larger than 3, and is compatible with current television systems. The present invention relates to a television signal synthesis device and a television signal decoding device for reproducing the television signal.

Conventional technology Japan's current National TSC (National TSC)
elevi-51on SS75t8 Comm1tt
Approximately 26 years have passed since color television broadcasting using the EE) system began in 1961. In the meantime, various new television systems have been proposed in response to demands for high-definition screens and improvements in the performance of television receivers. Furthermore, the content of the programs provided is changing from simple studio programs and relay programs to programs with higher quality and more realistic images, such as cinema-sized movie broadcasts.

Against this background, the Japan Broadcasting Corporation (NHK) proposed a high-definition television system. (For example, Literature Special Feature on High Definition Television (Television Society Journal Vol. 36,
No. 10, 1982) The contents are: 1125 scanning lines, 2:1 interlaced scanning, luminance signal horizontal bandwidth 2
In addition to achieving high definition with QMH2, the aspect ratio (ratio of horizontal to vertical screen) i5 was adopted from the perspective of visual engineering to create a sense of realism.
:3. This system has already been almost completed in closed systems, and with the start of satellite broadcasting, satellite
MUSE method for transmitting high-definition television in the channel band (Reference, Tasuku Ninomiya et al., Satellite 1-channel transmission method (MUSE) for high-definition television (IEICE technical research report)
1E84-72.1984)) and are conducting experiments.

On the other hand, current broadcasting uses 625 scanning lines, 2:1 interlaced scanning,
It has specifications such as a luminance signal horizontal bandwidth of 4.2 M l-1z and an aspect ratio of 4:3. (For example, refer to the literature Broadcasting Technology Multilingual Color Television, edited by the Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, 1961.) When a movie is provided as the above program, the screen size should be adjusted to the aspect ratio of the current television receiver. Either the ends are cut off so that the ratio is 4:3, or invalid screens are provided at the top and bottom of the screen, and the aspect ratio of the valid screen is transmitted so that it has the value of all movies.

Problems to be Solved by the Invention As mentioned above, when transmitting and servicing movie programs and immersive screens in current broadcasting, some of the screens are overlapped or the screen area becomes smaller, so producers have to There was a problem in that the intention was not fully conveyed. Furthermore, if a signal with an aspect ratio larger than 4:3 is simply transmitted, it will not be able to be received by a normal receiver.

The present invention has been made in view of the above problems, and includes a television signal synthesis device and a television signal synthesis device for generating a television signal that is not compatible with the current television system and has a more horizontally elongated aspect ratio. An object of the present invention is to provide a television signal decoding device for reproduction.

Means for Solving the Problems In order to solve the above problems, the television signal processing device of the present invention converts a part of the electrical signal obtained by capturing an original image having an aspect ratio larger than 4:3 into means for time-stretching a composite television signal obtained from the remainder of the electrical signal to a frequency higher than the narrowband color difference signal obtained from the time-stretched first signal; a frequency converter that
an adder that adds the narrowband color difference signal and the output of the frequency converter; a converter that inputs and balance-modulates the wideband color difference signal obtained from the output of the adder and a first signal;
It is equipped with an adder that adds the brightness signal obtained from the signal of the television signal f, (
It is equipped with means for compressing the time axis of the luminance signal, I, and Q signals after TO separation and color demodulation, and means for compressing the time axis after frequency conversion. A television signal is totally synthesized from the obtained electrical signals, and the television signal is further reproduced.

Effect of the Invention The present invention has the above-described configuration, so that even current television receivers can receive the signal without any problems, and by conversely compressing the time axis on the receiving side of the time axis expanded electrical signal, a screen having a horizontally long aspect ratio can be created. It is possible to synthesize television signals that can obtain It is possible to obtain a screen having an aspect ratio of .

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 2(a) shows one line of a display screen of a current television, and FIG. 2(a) shows a composite video signal for one scanning line period near the center of the screen. Since the aspect ratio is 4=3, part of the left and right circles of the three circles may be missing, as shown in the display column of FIG. 2(a).

Figure 3 (a) shows -Flk of the display screen when the aspect ratio is larger than the current one, for example 6:3.
, FIG. 3(b) shows the video signal for one scanning line period near the center of the screen, and FIG. 3(0) shows the time axis scale as shown in FIG.
This figure shows a composite video signal in which the video signal in FIG. 3('b) has been rewritten so as to be equal to that in FIG. The aspect ratio is 5:3
It is not limited to. If the aspect ratio is increased as shown in FIG. 3 (2L), more video information can be obtained than on the screen shown in FIG. 2(a). Now, with the current television receiver, the above aspect ratio! 5=3
In order to maintain compatibility, in other words, when receiving video signals of Apply stretching. This is shown in Figure 2(b)
As can be seen by comparing Figure 3 (C) with Figure 3 (C).
) is received by a current television receiver, it becomes a vertically elongated ellipse even though the original image is a circle, so it is necessary to extend the time axis of the signal in Figure 3 (C). . In other words, the aspect ratio m = 3 (m
is a real number of 4 or more), the image signal f m corresponding to the portion displayed on the screen of a current television receiver may be time-axis expanded by 74 times. Furthermore, in order to obtain screen information with an aspect ratio of m:3, the remaining signal portion will be transmitted by frequency multiplexing. FIG. 1 is a block diagram of a television signal synthesis device according to an embodiment of the present invention. In FIG. 1, 1 is a luminance signal Y obtained from a signal captured by a camera with a larger aspect ratio than the current one, 4 is a wideband color difference signal I obtained from the above signal, and 7
is the narrowband color difference signal Q,2,5.8 obtained from the above signal.
is a signal distributor, 3, 6, 9° 14 is a time axis expansion circuit, 1
1.13, 17.18 are adders, 12.16 is a balanced modulation circuit, 16 is a frequency converter, 19 is a signal generation circuit, 2o
is a wide television signal. A luminance signal 1 obtained from a signal captured by a camera with a larger aspect ratio than the current one through a matrix circuit, etc. is input to a signal distributor 2, and distributed to a time axis expansion circuit 3 and an adder 13. Similarly, the wideband color difference signal 14 and the narrowband color difference signal Q7 respectively enter the signal distributor 6.8 and time axis expansion port #56.9.
and distributed to the balanced modulation circuit 12. Time axis expansion can be performed, for example, by changing the memory write and read clocks. When the original image is captured with a conventional horizontal aspect ratio of m:3 (m is a real number of 4 or more), the time axis is expanded for the image signal corresponding to the part displayed on the screen of current television receivers. Circuit 3.6.9 expands the time axis by m/4 times. Next, among the color difference signals distributed by the signal distributor 5.8, the remaining color difference signal components other than the color difference signal expanded by the time axis expansion circuit 6.9 are modulated by the balanced modulation circuit 12, and then by the adder 13. It is added to the remaining luminance components of the luminance signal other than the luminance signal expanded by the time axis expansion circuit 3. The output of the adder 13 is sent to the time axis expansion circuit 1
4, the signal is band-compressed and input to the frequency converter 15.

The signal frequency-shifted by the frequency converter 15 is frequency-multiplexed with the output signal of the time-base expansion circuit 9 by the adder 11. In other words, the color difference signal C which is the output of the time axis expansion circuit 9
Shift to a higher frequency position than the spectrum occupied by
Frequency multiplexing is applied. The output signal is modulated by a balanced modulation circuit 16 together with the output signal of the time axis expansion circuit 6, added to the output signal of the time axis expansion circuit 3 by an adder 17, and then added to the output signal of the time axis expansion circuit 3 by an adder 18. signal, a burst signal (these are not shown), and an identification signal for identifying the wide television signal and the currently broadcast television signal are added to form the wide television signal 2o. If the identification signal is arranged, it can be superimposed on the vertical retrace period. Note that the band of the time-axis expanded signal is expanded by time-axis expansion and compression on the receiving side, so the resolution does not decrease even if the aspect ratio increases. Aspect ratio 4:
The output signal S of the frequency converter 16, which corresponds to the information on both sides that does not fit on the screen of No. 3, is frequency multiplexed as a high frequency component of the color difference signal C. However, in current television receivers,
Since a filter is applied to limit the band during color demodulation, the signal S is blocked, so there is no interference with current television receivers, and compatibility can be achieved.

FIG. 4 is a block diagram of an apparatus for decoding a time-axis expanded and frequency-multiplexed television signal according to an embodiment of the present invention. In FIG. 4, 21 is the above-mentioned time-axis expanded one-frequency multiplexed television signal (hereinafter referred to as wide television signal), 22.30 is a yc separation circuit,
23, 25, 27.

29 is a time axis compression circuit corresponding to time axis expansion on the transmitting side, 24.31 is an I and Q demodulation circuit, 26 is a filter, 28
32 is a frequency conversion circuit, 32 is a signal switching circuit, 33 is a signal separation circuit, 34 is a matrix circuit, and 35 is an R, G, B signal. The wide television signal 21 is separated into a Y signal and a C signal by a yc separation circuit 22. The Y signal is time-base compressed by the time-base compression circuit 23 to become a Y1 signal.

In addition, the C signal is converted into a power signal and a Q signal by the I and Q demodulation circuit 24.
. The signal is separated into signals and is processed by the time axis compression circuit 25.
The time axis is compressed and becomes the 1st signal. The QOC signal is separated into a color signal Q and a side signal S by a filter 26, and the side signal S is shifted to the original baseband by a frequency conversion circuit 28, and then sent to time axis compression circuits 2a and 2, respectively.
9 is input. The output of the time axis compression circuit 27 is the Q1 signal, and the output of the time axis compression circuit 29 is the yc separation circuit 30.
, I, Q demodulation circuit 31 outputs the Y2 signal, the engineering 2 signal, and the Q2 signal.
It becomes a signal. Above Y+ + L r Q+ + Y2
The + E2 + Q2 signal is input to the signal switching circuit 32, where the Y+ + I+ signal is input to the portion corresponding to the screen of a current television receiver with an aspect ratio of 4:3.
, Q+ times signals are selected, and these are compressed on the time axis, so for the remaining period of one horizontal scanning period, for the current broadcasting, blanking signals etc. are selected inside the signal switching circuit 32. When generating and selecting the above-mentioned wide television signal, Y2, ”
21 Select Q2 signal. Signal switching circuit 3
The output of 2 becomes an R, G, B signal 35 by a matrix circuit 34. In addition, time axis compression circuit 23.25.27.2
9 is for restoring the television signal by compressing the time axis expanded part of the television signal having a horizontal aspect ratio so that the current television broadcasting can be received without any problems. . In other words, as can be seen by comparing Figure 2(b) and Figure 3(C), in order to receive the current broadcasting image without changing its aspect ratio, the current television signal must be adjusted in time. It is necessary to compress the shaft. The compression ratio is determined by the aspect ratio. The signal separation circuit 33 separates from the wide television signal 21 a synchronization signal, a color burst signal, and an identification signal (not shown) for distinguishing the wide television signal from the currently broadcast television signal. , the signal switching circuit 32 is controlled using the identification signal.

When receiving current television signals, a screen with an aspect ratio of 4:3 is projected near the center, and the remaining area of the receiver screen, which has a horizontal aspect ratio, is darkened by blanking etc. What is necessary is to perform processing such as the following.

It is assumed that the identification signal is superimposed on the vertical retrace period of the wide television signal 21.

Effects of the Invention As is clear from the above description, there is provided a means for time-axis expanding a part of an electrical signal obtained by capturing an original image having an aspect ratio larger than 4:3, and a first time-axis expanded means.
to a higher frequency than the narrowband color difference signal obtained from the signal.
a frequency converter for frequency-shifting a signal obtained by time-axis-expanding a composite television signal obtained from the remaining part of the electric signal; an adder for adding the output of the narrowband color difference signal and the frequency converter; a modulator that inputs a broadband color difference signal obtained from the output of the device and the first signal and performs balanced modulation, and a luminance signal obtained from the first signal;
By providing an adder that adds the outputs of the modulators and generating a video signal corresponding to the original image having the aspect ratio, it is possible to transmit scene information with a larger aspect ratio than currently available. The purpose of the present invention is to provide a device for synthesizing television signals that is compatible with the ability to receive television signals without any problems, and is further equipped with means for compressing the time axis of television signals and means for converting the frequency, It has the compatibility of transmitting scene information with a larger aspect ratio and being able to receive it without any problems even on current televisions. - By reproducing television signals, it is possible to transmit screen information with a wider aspect ratio than the current one. Obtainable. Furthermore, current television signals can also be received without any problems.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a television signal synthesis device according to an embodiment of the present invention, FIG. 2 (2L) is a plan view showing an example of the display screen of a current television, and FIG. 2(b) is the above FIG. 3(a) is a signal waveform diagram showing a composite video signal during one scanning line period near the center of the screen, and the aspect ratio is, for example,
Plan view of the display screen when the ratio is 6:3, Figure 3 (kl)
is a signal waveform diagram showing the video signal during one scanning line period near the center of the screen, and FIG. FIG. 4 is a signal waveform diagram showing a composite video signal obtained by rewriting the shown video signal and adding a synchronization signal and a color burst signal. FIG. 4 is a block diagram of a television signal decoding apparatus in an embodiment of the present invention. 3.8, 9.14... Time axis expansion circuit, 15.
... Frequency converter, 12.16 ... Balance modulation circuit, 23.25.27.29 ... Time axis compression circuit, 28 ... Frequency conversion circuit, 32...
...Signal switching circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4:3 Figure 3 ＼ Sana Shima

Claims (1)

[Claims] means for time-axis expanding a part of an electrical signal obtained by capturing an original image having an aspect ratio larger than 4:3;
a frequency converter that frequency-shifts a signal obtained by time-axis-expanding a composite television signal obtained from the remaining part of the electrical signal to a higher frequency than a narrowband color difference signal obtained from the time-axis expanded first signal; an adder that adds the narrowband color difference signal and the output of the frequency converter; a modulator that inputs and balance-modulates the wideband color difference signal obtained from the output of the adder and the first signal; A television signal synthesis device, comprising an adder for adding the obtained luminance signal and the output of the modulator, and generating a video signal corresponding to an original image having the aspect ratio, and a television signal. The apparatus is equipped with means for compressing the time axis of luminance signals, I, and Q signals obtained by YC separation and color demodulation, and means for compressing the time axis after frequency conversion. A television signal decoding device comprising a television signal decoding device characterized in that it expands a part of the obtained electric signal in the time axis, shifts the remaining part to a higher frequency than the Q signal, and reproduces a frequency-multiplexed television signal. Signal processing device.