JPS62173892A - 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 extension 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 I whose frequency band is limited so as to multiplex it. CONSTITUTION:Among signals Y, Q and I obtained by image-picking up by a camera whose aspect is larger than that of an conventional camera, 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 one, the Q and I 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 compression circuit 14 and to frequency shift by a frequency converter 15. After the output of the circuit 9 is added to a signal, whose high frequency band is blocked by a filter 10, by an adder 11, and modulated together with the output of the circuit 6 by a balanced modulator circuit 16 it is added to the output of the circuit 3, 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 the Invention 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 for reproducing the television signal and a television signal decoding device for reproducing the television signal.

Conventional technology Japan's current National TSC (National TSC)
e1evisi -on System Comm1t
color television broadcasting using the tee) system began in 1923.
Approximately 26 years have passed since it started in 2005. meanwhile,
With the demand for high-definition screens and improvements in the performance of television receivers, various new television systems have been proposed.

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, and a luminance signal horizontal bandwidth of 20.
MHz, and high definition, and from the viewpoint of visual engineering such as immersion, the aspect ratio (ratio of horizontal to vertical screen) is 5:
3. This method has already been almost completed in the closed system, and with the start of satellite broadcasting, the MUSE method (Reference, Tasuku Ninomiya et al., Satellite Single Channel Transmission System for High Definition TV) ) (IEICE Technical Research Report I
E84-72.1984)) We have made all the proposals and are proceeding with the actual implementation.

On the other hand, current broadcasting uses 626 scanning lines, 2:1 interlaced scanning,
Luminance signal horizontal bandwidth 4.2MH2, aspect ratio 4:3
It has various specifications. (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 of all current television receivers is required. Either edges are cut off at both ends so that the aspect 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 sent out to match the movie value.0 Problems to be Solved by the Invention As mentioned above, when currently broadcasting a movie program or providing a realistic full-screen broadcast/service, some parts of the screen are cut or the screen area is reduced, making it difficult to fully convey the producer's intentions. There was a problem. Furthermore, if a signal with an aspect ratio larger than 4=3 is simply transmitted, a normal receiver will not be able to receive the signal.

The present invention has been made in view of the above points, and is compatible with current television systems, and also includes a television signal synthesis device that generates a television signal having a horizontally elongated aspect ratio, and a television signal synthesis device that reproduces the television signal. The overall objective is to provide a television signal decoding device that does the following:

Means to Solve All the Problems In order to solve all 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-axis stretching; and a broadband color difference signal obtained from the time-axis stretched first signal; and a composite television obtained from the remainder of said electrical signal to a higher frequency than a second signal obtained by band limiting the broadband color difference signal obtained from the time-axis stretched first signal. a frequency converter that frequency-shifts a signal obtained by time-domain-expanding a John signal; an adder that adds a second signal and the output of the frequency converter; and a narrow band obtained from the output of the adder and the first signal. It is equipped with a converter that inputs all color difference signals and performs balanced modulation, an adder that adds up the luminance signal obtained from the first signal and the output of the modulator, and further separates the television signals y and -we and performs color demodulation. means for time-base compressing redundant signals, I and Q signals;
A means for compressing the time axis after frequency conversion is provided; 4:
The entire television signal is generated from the electric signal obtained by capturing the entire original image having an aspect ratio of more than 3, and the entire television signal is 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 fully synthesize television signals, which can still receive television signals without any problems due to time axis compression on the receiving side. An embodiment of the present invention will be described below with reference to all the drawings. FIG. 2A shows an example of a display screen of a current television, and FIG. 2A shows an entire composite video signal for one scanning line period near the center of the screen. Aspect ratio is 4=3
Therefore, as in the display example shown in FIG. 2, part of the left and right circles among the three circles may be missing. Figure 3a shows an example of a display screen when the aspect ratio is larger than the current one, for example 5:3. FIG. 3C shows the entire composite video signal obtained by rewriting the entire video signal of FIG. 3 and adding a synchronization signal and a color burst signal so that the scale of the time axis is equal to that of FIG. 2. Note that the aspect ratio is not limited to 5:3. If the aspect ratio is increased as shown in FIG. 3B, more video information can be obtained than on the screen shown in FIG. 21. Here, with the current television receiver, the above aspect ratio is 5.
In order to maintain compatibility, in other words, when receiving a video signal of 3, it can be received without any problem compared to the conventional method. Apply time axis expansion. As can be seen by comparing Figure 2 and Figure 3C, when the signal in Figure 3C is received by a current television receiver, even though the original image is a circle, it is vertically oriented. Therefore, it is necessary to expand the entire time axis of the signal shown in Figure 3C. In other words, when an original image is captured with a conventional horizontally elongated aspect ratio of m:3 (m is a real number of 4 or more), an image signal of 2 m corresponding to the part displayed on the screen of a current television receiver is used.
/4 Just extend the opening time axis. 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 aspect ratio, 4 is a narrowband color difference signal Q obtained from the above signal, 7 is a wideband color difference signal signal obtained from the above signal, 2, 5.8 is a signal splitter, 3, 6, 9° 14 is a time axis expansion circuit, 10 is a filter, 11° 13.17.18 is an adder, 12.16 is a balanced modulation circuit, 15 is a frequency converter 19 is a signal generation circuit, and 20 is a wide television signal. IJ from signals captured with a camera with a larger aspect ratio than the current one
Luminance signal 1 obtained by using a bus circuit etc., signal distributor 2
The signal is then distributed to the time axis expansion circuit 3 and the adder 13. Similarly, narrowband color difference signal Q4 and wideband color difference signal 1
7, each enters a signal distributor 5.8 and is distributed to a time base expansion circuit 6.9 and a balanced modulation circuit 12. Time axis expansion can be performed, for example, by changing the memory write and read clocks. tHt than before
When the entire original image is captured with an aspect ratio of 'H' length m:3 (m is a real number of 4 or more), the image signal corresponding to the part displayed on the screen of a current television receiver is transferred to the time axis expansion circuit 3. , 6.9, the opening time axis is extended by m/4. 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 modulated 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 subjected to band compression by the time axis expansion circuit 14 and input to the frequency converter 15 . The signal frequency-shifted by the frequency converter 16 is frequency-multiplexed by the adder 11 with the signal whose high frequency has been completely cut off by the output signal full filter 10 of the time axis expansion circuit 9. That is, it is shifted to a higher frequency position than the spectrum occupied by the color difference signal C that has passed through the filter 10, and frequency multiplexing is performed. 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. The wide television signal, the burst signal (these are not shown), the currently broadcast television signal, and the identification signal for gold identification are added to form the wide television signal 20. For example, the identification signal 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 3, is frequency multiplexed as a high frequency component of the color difference signal C, but in current television receivers, it is Since the signal S is filtered to limit the band, there is no interference with existing 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 time axis extension 9 mentioned above.
Frequency multiplexed television signal (hereinafter referred to as wide television signal), 22.30 is a yc separation circuit, 2
3, 25, 27.

29 is a time axis compression circuit corresponding to time axis expansion on the sending side, 24.31 is an I and Q demodulation circuit, 26 is a filter, 28
is a frequency conversion circuit, 32 is a signal switching circuit, 33 is a signal separation circuit, 34 is an IJ circuit, 35 is R, G, B
It's a 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 the Yl signal.

Further, the C signal is separated into a Q signal and an output signal by the I and Q demodulation circuit 24, and the Q signal is separated by the time axis compression circuit 25.
The time axis is compressed to become the Q1 signal. The signal 〇 is separated into an emergency signal signal 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 a time axis compression circuit 27.2.
9 is input. The output of the time axis compression circuit 27 becomes the signal 1, and the output of the time axis compression circuit 29 becomes the YC separation circuit 30.
, I, Q demodulation circuit 31 outputs I2 signal, 1° signal, Q2
It becomes a signal. Above Y1, Engineering 1, Ql, I2, Engineering 2, Q2
The signal is input to a signal switching circuit 32, where Y1. ■ + IQ + signals are selected, and since these are compressed on the time axis, for the remaining period of one horizontal scanning period, first, blanking signals etc. are sent to the signal switching circuit 32 for the current broadcasting. The signals are generated internally and selected, and when receiving the wide television signal, the I2, I2, and Q2 signals are selected. The output of the signal switching circuit 32 becomes R, G, B signals 36 by the matrix circuit 34. Note that the time axis compression circuits 23 and 25.

27.29 is a method that completely restores the above television signal by fully compressing the time axis expanded part of the television signal having a horizontally long aspect ratio so that the current television broadcasting can be received without any problems. It is.

In other words, as can be seen by comparing Figure 2 and Figure 3 ay, in order to receive images without changing the aspect ratio of current broadcasting, it is necessary to compress the time axis of current television signals. . The compression ratio is determined by the aspect ratio. The signal separation circuit 33 separates the wide television signal 21
From sync signal, color burst signal.

The wide television signal is separated from the current broadcast television signal by an identification signal (not shown), and the signal switching circuit 3 uses the above identification signal.
2 Full control. In addition, when receiving all 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 with a horizontally long aspect ratio is darkened by blanking etc. All you need to do is to perform the following processing. It is assumed that the identification signal is overlapped or omitted during the vertical retrace period of the wide television signal 21, for example.

Effects of the Invention As is clear from the above explanation, there is provided a means for time-axis stretching a part of an electrical signal obtained by capturing an original image having an aspect ratio of more than 4:3, and a first
The composite television signal obtained from the rest of the electrical signal is shifted to a higher frequency than the broadband chrominance signal obtained by band-limiting the signal, and the time axis of the composite television signal is shifted to a higher frequency than the second signal obtained by band-limiting the signal. a converter, an adder that adds the second signal and the output of the frequency converter; a modulator that receives all the narrowband color difference signals obtained from the output of the adder and the first signal and performs balanced modulation; It is equipped with an adder that adds the luminance signal obtained from the signal 1 and the output of the modulator, and generates all the video signals corresponding to the original image having the aspect ratio described above, thereby generating scene information with a larger aspect ratio than the current one. The purpose of the present invention is to provide a device for completely synthesizing television signals, which is compatible with the ability to transmit all signals and to receive them without any problems even on current televisions. It is equipped with all means for frequency conversion, transmits all scene information with a larger aspect ratio than the current one, and can be received without any problems even with the current TV. A screen with a full horizontal aspect ratio can be obtained. Furthermore, current television signals can also be received without any hassle.

[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. 2a is a plan view showing an example of a display screen of a current television, and FIG. A signal waveform diagram showing a composite video signal for one scanning line period. Fig. 3 is a plan view of the display screen when the aspect ratio is set to, for example, 6:3. Fig. 3 is one scan near the center of the screen. Signal waveform diagram showing video signal during line period, Figure 3C
is the third scale so that the scale of the time axis is equal to that in Figure 2.
FIG. 4 is a signal waveform diagram showing the total amount of the composite video signal to which the synchronization signal and color burst signal for rewriting the video signal shown in FIG. 3.6, 9.14... Time axis expansion circuit, 16.
... Frequency converter, 12, 16 ... Balanced modulation circuit, 23.25, 27.29 ... Time axis compression circuit, 28 ... Frequency conversion circuit, 32 ...・・・・・・
Signal switching circuit. Figure 2 4.3 Figure 3 Σ5;j) IS

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;
Time-axis stretching the composite television signal obtained from the remaining part of the electrical signal to a higher frequency than the second signal obtained by band-limiting the broadband color difference signal obtained from the time-axis stretched first signal. a frequency converter that shifts the frequency of the signal, an adder that adds a second signal and the output of the frequency converter, and a narrowband color difference signal obtained from the output of the adder and the first signal that is input and balanced. It is characterized by comprising a modulator that performs modulation, and an adder that adds the luminance signal obtained from the first signal and the output of the modulator, and generates a video signal corresponding to an original image having the aspect ratio. a television signal synthesizer that performs
Luminance signal obtained by separating YC and color demodulating the television signal, I
, comprising means for time-axis compressing the Q signal and means for compressing the time-axis after frequency conversion, and time-axis expansion of a part of the electrical signal obtained by capturing an original image having an aspect ratio larger than 4:3. 1. A television signal processing device comprising: a television signal decoding device for reproducing a frequency-multiplexed television signal by shifting the remaining portion to a higher frequency than the band-limited I signal.