JPS6276984A - Wide aspect television signal synthesizing device - Google Patents

Abstract

PURPOSE:To attain the reproducing of a picture having a longer aspect ratio in its lateral direction than the conventional television receiver by separating a picture signal having the aspect ratio larger than the ratio of 4 to 3 to a main picture signal and a sub picture signal and time-shifting the sub picture signal. CONSTITUTION:At a picture separation circuit 2, a picture signal is separated to a main picture area A that is a picture part having the aspect ratio of 4 to 3 and a sub picture area B that is the picture part other than the main picture part, and separated sub picture signal is supplied to a time shift circuit 3. At the time shift circuit 3, the sub picture area B is moved to an area B within a vertical retrace period VBL, being supplied to a picture synthesizing circuit 4. At a time base extending circuit 5, the synthesizing picture signal is time-base extended against the picture portion of the areas A and B in the horizontal direction and is outputted to an output terminal 6 as a wide aspect television signal. Thereby, the synthesis and the transmission of the picture signal having a longer aspect ratio in the lateral direction than the existing television of NTSC system can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides wide aspect television signal synthesis that is compatible with current television receivers and enables television broadcasting with a horizontally widened aspect ratio. It is related to the device.

Conventional TechnologyCurrent National Telecommunications (NTSC)
system)
Approximately 25 years have passed since color television broadcasting using this method began in 1960.

In the meantime, various new television systems have been proposed in response to the demand for true-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)
issue, 1982) The content is 1125 scanning lines.
In addition to achieving high definition with interlaced scanning and a brightness horizontal bandwidth of 20M11z, the screen aspect ratio was set to 3:5 from the viewpoint of visual engineering such as a sense of realism. This system has already been almost completed in the closed system, and with the start of satellite broadcasting, the MUSE system (Reference, Tasuku Ninomiya et al. ) (IEICE technical research report IE84-72.1984)), and experiments are underway.

On the other hand, the current NTSC system has 525 scanning lines, interlaced scanning, horizontal luminance bandwidth of 4.2Ml1z, and aspect ratio of 4:3.
It has various specifications. FIG. 5 shows the signal structure of the current NTSC system. Image signal has an aspect ratio of 4:3
image part, horizontal retrace period HBL, vertical retrace period VBL
It becomes more. Horizontal scanning frequency rM is approximately 15.734 k
Hz (horizontal scanning period T, approximately 63.5 μs), vertical scanning frequency fv is approximately 6011 z (vertical scanning period Tv is approximately 1/60S), and in the receiver, the vertical scanning sawtooth wave is an RC time constant. It oscillates at the vertical synchronization frequency of the input image signal with a determined slope. Therefore, in the receiver, when the vertical synchronization frequency is 6011z, the vertical scanning is set to be deflected to the position of point P1. (For example, refer to the literature Broadcasting Technology Multilingual Color Television for the Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, 1961) Current television receivers, although various improvements have been made, (a phenomenon in which a color signal is reproduced as a luminance signal and a dot-like disturbance is produced on the reproduced luminance screen) and interlaced interference occur. In addition, when providing a movie as the program, the screen size must be cut off at both ends to match the 4:3 aspect ratio of current TV receivers, or compressed in the vertical (vertical) direction to reduce the effective angle of view. The aspect ratio of the image is transmitted so that it matches the movie value.

Problems to be Solved by the Invention As mentioned above, when transmitting and providing services for movie programs and immersive screens in current broadcasting, some parts of the screen are cut off, the screen area is small, etc. There were problems such as not being able to convey the message sufficiently and the sense of realism being lost.

The present invention has been made in view of the above, and an object of the present invention is to provide a wide aspect television signal synthesis device having an aspect ratio that is even wider than the current television signal.

Means for Solving the Problems In order to solve the above problems, the wide aspect television signal synthesis device of the present invention separates an image signal with an aspect ratio larger than 4:3 into a main image signal and a sub-image signal. means for time-shifting the sub-image signal; means for synthesizing the main image signal and the time-shifted sub-image signal to obtain a composite image signal; and means for time-expanding the composite image signal. The present invention has a configuration including the following.

Effect: With the above-described configuration, the present invention makes it possible to transmit images with an aspect ratio larger than 4=3, and on the receiver side, it is possible to reproduce images having an aspect ratio that is more horizontally elongated than that of conventional television receivers. It is something.

Embodiment Hereinafter, a wide asbestos I television signal synthesis apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a wide aspect television signal synthesis apparatus according to a first embodiment of the present invention. In FIG. 1, 1 is an input terminal for a horizontally long image signal with an aspect ratio of 4:3, 2 is an input terminal for a horizontally long image signal with an aspect ratio of 4:3, and a main image signal consisting of an image portion with an aspect ratio of 4:3 is An image separation circuit separates the main image signal into a sub-image signal consisting of an image part other than the main image signal; 3 is a time shift circuit that shifts the temporal position of the sub-image signal; 4 is a sub-image signal that is shifted in time from the main image signal; 5 is a time axis expansion circuit that combines the composite image signal with the image signal to obtain a composite image signal; 5 is a time axis expansion circuit that temporally expands the composite image signal in the horizontal direction to obtain a wide aspect television signal; 6 is a main image signal and a sub image signal; 7 indicates a wide aspect television signal synthesis circuit.

The operation of the wide aspect television signal synthesis apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

First, FIG. 2 shows the process of combining image signals by the wide aspect television signal combining device shown in FIG. 1, and FIG. 2(a) shows the image signal input terminal 1 in FIG.
is a wide aspect image signal whose aspect ratio is greater than 4:3, and in this example, the horizontal scanning frequency f
11 to 15.7, which is the same as the current television NTSC system.
34 k fiz (horizontal scanning period TH-1/ f 1
I=63.5μ5ec), and the horizontal retrace period HBL
The O width is also the same. The vertical scanning frequency fν is the current NT
Lower frequency than SC method (vertical scanning frequency 'M'r'V>
Tv = 1/60sec).

The wide aspect image is shown in the area shown in Figure 2 (al area (5) and area CB), and the image area (5), (B)
The number of horizontal scanning lines is about 490 (half this in the case of interlace scanning), which is the same as the current NTSC system. Therefore, as mentioned above, the vertical scanning frequency fv is
Since the frequency is lower than that of the C system, the number of horizontal scanning lines increases, and the vertical blanking period VBLO is shorter than the current NTSC system.
It is wider. In the image separation circuit 2 of the first country, the aspect ratio of the wide aspect image shown in FIG. 2(a) is 4.
: The main image area diagram which is the image part 3 and the sub image area which is the image part other than the main image part (131), the separated main image signal is supplied to the image synthesis circuit 4, and the separated sub image signal is The image signal is supplied to a time shift circuit 3. In the time shift circuit 3, the sub-image area (Bl
is transferred to the area (B) within the vertical retrace period VBL in FIG. The image synthesizing circuit 4 synthesizes the main image signal and the sub-image signal shifted to the vertical retrace period V131- to obtain the synthesized image signal shown in FIG. In the time axis expansion circuit 5, as shown in FIG.
(The image portion of Bl is expanded in the time axis in the horizontal direction and outputted to the output terminal 6 as a wide aspect television signal as shown in FIG. 6(C).

As described above, according to this embodiment, the aspect ratio is 4:3.
From a larger image signal, images on both sides of an image with an aspect ratio of 4:3 are temporally moved onto the horizontal scanning line during the vertical retrace period, which is increased by setting the vertical scanning frequency to a lower frequency than the current NTSC system. Placed and aspect ratio 4
By time-expanding the image after composing it with a 3:3 image, it is possible to synthesize and transmit an image signal having a wider aspect ratio than that of the current NTSC television.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of a color wide aspect television signal synthesis apparatus using a wide aspect television signal synthesis apparatus according to a second embodiment of the present invention. In the figure, 8 is a wide aspect color camera that captures color images with an aspect ratio larger than 4:3, 9 is a wide aspect color camera that captures color images with an aspect ratio larger than 4:3, and 9 is a luminance signal Y, a wideband color signal I, 10 is a delay circuit for luminance signal Y; 11 is a low-pass filter for chrominance signal I; 12 is a low-pass filter for chrominance signal Q;
13, 14, and 15 are the wide aspect television signal synthesis circuits shown in FIG. 7 of the first embodiment; 16 is a balanced modulator that performs color modulation; and 17 is a balanced modulated luminance signal and addition of color signals. Circuit, 18 is color wide aspect 1~
This is an output terminal for television signals.

The operation of the color wide aspect television signal synthesis apparatus configured as described above will be described below.

The wide aspect color image captured by the wide aspect color camera 8 is supplied to the matrix conversion circuit 9 in the form of three primary color signals R, G, and B. In the matrix conversion circuit 9, the wide aspect color image of the three primary color signals R, G, and B is converted into a luminance signal Y, a wideband color signal ■, and a narrowband color signal Q by matrix conversion using the N T SC method. Delay circuit 10 and low-pass filter 11, respectively
．． 12. In the delay circuit 10, the luminance signal Y
The wide aspect television signal synthesis circuit 1 is delayed by the amount that the color signals I and Q are delayed by the low-pass filters 11 and 12.
3. In the low-pass filter 11.12, the wide-band chrominance signal (2) and the narrow-band signal Q are low-pass filtered and supplied to a wide aspect television signal synthesis circuit 14.15, respectively. In the wide aspect television signal synthesis circuits 13, 14, and 15, the luminance signals Y,
A wide aspect television signal is combined with the wideband color signal I and the narrowband color signal Q using the method described in the first embodiment, and the combined luminance signal Y is sent to the adder circuit 17 as the combined wideband color signal. (2) and the narrowband color signal Q are supplied to the balanced modulation circuit 16. In the balanced modulation circuit 16, the wideband color signal (1) and the narrowband color signal Q are each balanced-modulated with a frequency of 3.58M Ilz using color subcarriers having a phase difference of 90 degrees, and are supplied to an adder 17. The adder 17 adds the luminance signal Y and the balanced modulated color signal, and outputs a wide aspect color television signal from the output terminal 18.

As described above, by using the wide aspect television synthesis circuit for each of the luminance signal Y, wideband color signal ■, and narrowband color signal Q, it is possible to synthesize and transmit color images (wide aspect television images). I can do it.

Next, the principle of reception of the wide aspect television signal synthesized in the above embodiment will be explained using FIG. 4.

Figure 4 (a) shows a case where the image is received by a wide aspect television receiver, and the aspect ratio of the display section of the receiver is longer than the 4:3 aspect ratio of the conventional NTSC system vision receiver. ing. By receiving a wide aspect television signal, converting the arrangement of the main image area (5) and sub-image area (81) as shown in the same figure, and scanning with the horizontal scanning sawtooth wave and vertical scanning sawtooth wave shown in the same figure, a wide aspect television signal is received. Aspect images can be played back.

FIG. 4(b) shows the case where a wide aspect television signal is received by a current NTSC system vision receiver. The vertical scanning frequency of the wide aspect television signal is higher than the current NTSC frequency, so the vertical scanning sawtooth wave is higher than the current NTSC frequency, as shown in the figure.
What was deflected to the position of method P1 in the TSC direction will be overscanned to the position of point P2. Therefore, the sub-image (B ) is not displayed on the screen, and the aspect ratio is 4:
Only the main image (5) of No. 3 is displayed.

Note that the first and second embodiments are examples that maintain compatibility with current NTSC system receivers, but if the horizontal scanning frequency and color modulation system are made the same as other television systems, , it is possible to synthesize wide aspect television signals that are compatible with television receivers of that type.

In addition, in the second embodiment, a wide aspect television signal was synthesized for each of the luminance signal Y, wideband color signal ■, and narrowband color signal Q, which is output from a wide aspect color camera. Three primary color signals R
, G, and B, or to the wideband color signal I and the narrowband color signal Q before passing through the low-pass filter.

Effects of the Invention As described above, according to the present invention, when transmitting or servicing movies or programs with a sense of realism, images with an aspect ratio of 5:3, for example, can be played back as they are on the receiver.
It is possible to sufficiently convey the sense of presence and the intention of the program author, and it also maintains compatibility without causing interference when received by current television receivers, making it extremely effective industrially.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a wide aspect television signal synthesis device according to a first embodiment of the present invention, FIG. 2 is a principle diagram showing the image signal conversion process to explain the operation of FIG. 1, and FIG. The figure is a block diagram of a wide aspect color television signal synthesis device according to a second embodiment of the present invention, and FIG. 4 is a diagram of the principle of reception of a wide aspect television signal.
FIG. 5 is a configuration diagram of an image signal of a conventional NTSC television receiver. 2... Image separation circuit, 3... Time shift circuit, 4... Image synthesis circuit, 5...
Time axis expansion circuit, 7... wide aspect television signal synthesis circuit, 8... wide aspect color camera, 9... matrix conversion circuit,
10...Delay circuit, 11.12...Low pass filter, 13.14.15...Wide aspect television signal synthesis circuit, 16... - Balanced modulation circuit, 17... Adder. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 2 'HB'L BL

Claims (1)

[Claims] means for separating an image signal having an aspect ratio larger than 4:3 into a main image signal and a sub-image signal; a means for time-shifting the sub-image signal; and a means for separating the main image signal and the time-shifted sub-image signal. What is claimed is: 1. A wide aspect television signal synthesizing device comprising: means for synthesizing and obtaining a synthesized image signal; and means for expanding the synthesized image signal on a time axis.