JPH0662334A - Television signal transmitter and receiver - Google Patents

Abstract

PURPOSE:To make auxiliary signals inconspicuous as noise signals by inserting predetermined pattern signals to the non-picture parts of upper and lower panels as background and transmitting signals for which the auxiliary signals are multiplexed on the pattern signals. CONSTITUTION:Multiplex auxiliary signals such as vertical high frequency signals or the like are inputted from an auxiliary signal input terminal 2 as the signals of the upper panel and are supplied to an adder 4. A switch 5 is connected to a B side at the upper panel and the inputted signals of the upper panel are outputted from a letter box signal output terminal 6. When the video images becomes a center panel, the switch 5 is switched to an A side and video signals inputted from a center panel signal input terminal 2 are passed through the switch 5 and outputted from a letter box signal output terminal 6. Then, at the time of the lower panel, the switch 5 is switched to the B side again and the video signals for which the auxiliary signals are multiplexed on the pattern signals are outputted similarly to the upper panel. When the video signals are projected to a receiver, preset patterns are projected at the upper and lower panels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal transmission system, and in particular, it is compatible with the current television system and has an aspect ratio of 4: 3 or more in the screen center portion and a non-image area in the upper and lower portions of the screen. The present invention relates to a transmission and reception device for a high-definition wide aspect television signal in which multiplex signals are superimposed on each other.

[0002]

2. Description of the Related Art Conventionally, in order to transmit a video signal such as a high-definition signal (aspect ratio 16: 9) having a screen aspect ratio larger than 4: 3 while maintaining compatibility with the NTSC system, a center panel of NTSC image is used. Wide aspect video part, upper and lower panels are non-image parts, and auxiliary signals such as horizontal and vertical high-frequency components of the center panel are superimposed in that area to achieve high image quality when reproduced on a wide aspect receiver. A suggestion to try is made.

For example, as shown on the left side of FIG. 9, a video signal having 525 scanning lines and an aspect ratio of 16: 9 is used on the transmitting side, and 480 effective scanning lines are 3/4 vertically.
Double compression, and 360 images of the center panel,
The upper and lower 60 lines are used as black or gray level non-image signal as shown in FIG. Then, as an auxiliary signal for returning the vertically compressed signal to the original with the wide aspect receiver, the vertical high range of the upper half of the wide aspect screen is transferred to the upper panel of the non-picture part and the vertical high range of the lower half. Parts are multiplexed and transmitted to the lower panel of the non-image part as shown in FIG. When this is received by the current receiver, the upper and lower panels become black or gray non-image areas as shown on the right side of FIG. 9, and a 16: 9 image is displayed on the center panel.

When this signal is received by the wide aspect receiver, the signals of 360 scanning lines of the center panel are vertically expanded to reproduce the high frequency signals multiplexed on the upper and lower panels to compensate for them. As a result, a wide aspect image of 480 original effective scanning lines can be obtained.

[0005]

In the above-mentioned conventional television signal transmission system, since the upper and lower panels are flat signals with nothing, when an auxiliary signal is multiplexed on the upper and lower panels, when reproduced by the current receiver, There was a problem that the multiple signals on the upper and lower panels were conspicuous, and they interfered.

[0006]

In order to solve the above-mentioned problems, the present invention is compatible with the NTSC television system, and the upper and lower parts of the screen are set as non-image parts and auxiliary signals for improving the image quality are provided there. In a wide aspect television signal transmitter for multiplexing and transmitting, signal generating means for generating a predetermined pattern signal for superimposing on the non-picture part, and an auxiliary signal for multiplexing the auxiliary signal on the pattern signal The configuration is provided with multiplex means.

Further, it is compatible with the NTSC television system, the upper and lower parts of the screen are non-image parts, and a predetermined pattern signal is superimposed on the non-image parts, and an auxiliary signal for improving the image quality is added to the pattern signals. In a wide aspect television signal receiving apparatus for reproducing a television signal transmitted by multiplexing and obtaining a high quality wide aspect image, the pattern signal is stored in advance and a signal generation for generating the pattern signal is performed. Means, a timing control means for controlling the generation timing of the pattern signal, and a pattern signal obtained by the signal generating means provided on the receiving device side from the pattern signal superimposed on the non-picture part of the received television signal. And an auxiliary signal extracting means for extracting the auxiliary signal by subtracting.

Further, in a wide aspect television signal transmitting device which is compatible with the NTSC television system, and which transmits an auxiliary signal for image quality enhancement by multiplexing the upper and lower portions of the screen as non-image portions, Signal generating means for generating a pattern signal for superimposing on a non-image part, and a pattern signal for superimposing the pattern signal as a reference signal on a vertical blanking period of a television signal or a predetermined specific line of a vertical overscan part The superimposing means and the auxiliary signal multiplexing means for multiplexing the auxiliary signal on the pattern signal to be superimposed on the non-image part are provided.

Furthermore, it is compatible with the NTSC television system, and the upper and lower parts of the screen are non-image parts, and the pattern signals are superimposed on the non-image parts, and the auxiliary signals for high image quality are multiplexed on the pattern signals. Along with the above-mentioned pattern signal in which the auxiliary signal is not multiplexed as a reference signal, the television signal transmitted by being superimposed on a predetermined specific line of the vertical blanking period or vertical overscan portion of the television signal is reproduced. In a wide-aspect television signal receiving device for obtaining a high-quality wide-aspect image, a pattern signal storage generation means for storing a pattern signal on which an auxiliary signal transmitted as the reference signal is not superimposed and generating the stored pattern signal , The control means for controlling the timing of capturing and generating the pattern signal and the non-image part where the auxiliary signal is multiplexed are superimposed. By subtracting the pattern signals from the pattern signal storage generating means than the pattern signal it is allowed to provide a an auxiliary signal extraction means for extracting the auxiliary signal.

[0010]

In the first television signal transmitting device,
On the transmitting side, a predetermined pattern signal is inserted as a background in the non-image part of the upper and lower panels of the letterbox system, and the television signal in which the auxiliary signal is multiplexed is transmitted. Further, in the second television signal receiving apparatus, on the receiving side, the same pattern signal as the predetermined pattern signal is subtracted from the pattern signal in which the auxiliary signals to be superimposed on the upper and lower panels are multiplexed to subtract the auxiliary signal. Derive. Further, in the third television signal transmitting apparatus, on the transmitting side, a pattern signal is inserted as a background in the non-image part of the upper and lower panels of the letterbox and the auxiliary signal is multiplexed therein, and at the same time, the auxiliary signal is multiplexed as the reference signal. Only the pattern signal that has not been transmitted is superimposed on the vertical blanking period of the television signal or a predetermined one line of the vertical overscan portion and transmitted. Furthermore, in the above-mentioned fourth television signal receiving apparatus, a signal sent by being superimposed on a predetermined retrace line of a television signal or a predetermined line of a vertical overscan portion is sent as a reference signal of a pattern on the receiving side. The auxiliary signal is derived by storing and subtracting that signal from the signals of the upper and lower panels.

[0011]

1 is a block diagram of the essential parts of a first embodiment of the present invention. The first embodiment will be described with reference to FIGS. 1 and 5 to 8. In FIG. 1, first, a multiplexed auxiliary signal such as a vertical high frequency signal is input from an auxiliary signal input terminal 2 as a signal on the upper panel and supplied to an adder 4. Further, the pattern signal generator 3 supplies to the adder 4 a predetermined video signal having a background pattern, such as the upper and lower panels of FIG. In the adder 4, for example, the pattern video signal as shown in FIG. 6 and the multiplex auxiliary signal as shown in FIG. 8 are added and the video signal as shown in FIG. 7 is supplied to the switch 5.

The switch 5 is connected to the B side on the upper panel and outputs the input upper panel signal from the letterbox signal output terminal 6. When the image becomes the center panel, the switch 5 is switched to the A side, and the image signal input from the center panel signal input terminal 2 passes through the switch 5 and is output from the letterbox signal output terminal 6.
Then, when it becomes the lower panel, the switch 5 is switched to the B side again, and like the upper panel, the video signal in which the auxiliary signal is multiplexed with the pattern signal is output.

When the letterbox type video signal output from the output terminal 6 formed as described above is displayed on the current receiver, the center panel is the same as the conventional one as shown in FIG. Shows a preset pattern.

FIG. 2 is a block diagram of the essential parts of the second embodiment of the present invention. The second part described above with reference to FIGS. 2 and 5 to 8.
An example will be described. In FIG. 2, when a letterbox-type video signal in which the pattern signal in which the auxiliary signal described in the embodiment of FIG. 1 is multiplexed is superimposed on the upper and lower panels is input from the letterbox signal input terminal 7, this video signal is output. Is supplied to the switch 8 and the control circuit 9. First, in the upper panel, the switch 8 is connected to the E side, and the video signal of the upper panel as shown in FIG.
1 is supplied.

The control circuit 9 controls the pattern signal generator 10 by detecting the timing of the upper panel from the synchronizing signal of the input signal. The pattern signal generator 10 stores a signal having a predetermined background pattern having the same waveform as that on the transmission side, and is shown in FIG. 6 in accordance with the timing when the multiplexed portion of the input signal is supplied to the subtractor 11. Generate a pattern signal such as Subtractor 11
Then, the pattern signal as shown in FIG. 6 is subtracted from the signal of the upper panel as shown in FIG. 7, and the multiplexed auxiliary signal as shown in FIG. 8 is output from the auxiliary signal output terminal 13.

When the center panel signal is subsequently input, the switch 8 is connected to the D side, and the center panel video signal passes through the switch 8 and the center panel signal output terminal 1
2 is output. Then, in the lower panel, the switch 8 is connected to the E side again like the upper panel, and the auxiliary signal obtained by subtracting the pattern signal from the signal of the lower panel is output from the output terminal 13. The output signals are thereafter subjected to various signal processing for wide aspect display.

FIG. 3 is a block diagram of the essential parts of the third embodiment of the present invention. Referring to FIG. 3 and FIG. 5 to FIG.
An example will be described. The same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 3, first, in a vertical blanking period or in a predetermined specific line of the vertical overscan portion, the switch 5
Is connected to the C side and only the pattern signal as shown in FIG. 6 is output from the letter box signal output terminal 6 through the switch 5 from the pattern signal generator 3 as the reference signal.

As for the signals of the upper and lower panels, the switch 5 is connected to the B side as in the first embodiment, and the auxiliary signal is multiplexed with the pattern signal and output as shown in FIG. As for the center panel, the switch 5 is connected to the A side as in the case of the first embodiment, and the center signal is output as it is.

In this way, a pattern signal is superimposed as a reference signal on a predetermined specific line of the vertical blanking period or the vertical overscan portion, and a signal obtained by multiplexing the pattern signal with an auxiliary signal is displayed on the upper and lower panels. The center panel transmits a television signal which is an input video signal.

FIG. 4 is a block diagram of the essential parts of the fourth embodiment of the present invention. Referring to FIG. 4 and FIG. 5 to FIG.
An example will be described. The same parts as those of the second embodiment shown in FIG. 2 are designated by the same reference numerals and their explanations are omitted. In FIG. 4, when the letterbox format video signal transmitted from the television signal transmitting apparatus described in the third embodiment is input from the letterbox signal input terminal 7, the input television signal is switched. 8, memory 1
4 and the control circuit 9.

First, the control circuit 9 detects the position of the pattern signal inserted in one line in the vertical blanking period or the vertical overscan period from the synchronizing signal of the input signal or the like, and the control signal from the control circuit 9 detects the position. A pattern signal as shown in FIG. 6 is written in the memory 14 as a reference signal.

Subsequently, in the upper and lower panels, the switch 8 is connected to the E side, and the video signals of the upper and lower panels as shown in FIG. 7 are supplied to the subtractor 11. The control circuit 9 detects the timing of the upper and lower panels and controls the reading of the memory 14. The memory 14 generates the pattern signal written as described above at the timing when the multiplexed portion of the input signal is supplied to the subtractor 11. The subtracter 11 converts the signals of the upper and lower panels as shown in FIG.
8 is subtracted, only the multiplexed auxiliary signal as shown in FIG. 8 is derived, and the multiplexed auxiliary signal is output from the auxiliary signal output terminal 13.

With respect to the center panel, the switch 8 is connected to the D side as in the second embodiment, and the input video signal of the center panel is directly output from the output terminal 12.

[0024]

Since the present invention has the above-described structure, when a letterbox format image is displayed on a current broadcast receiver, the auxiliary signal is a noise signal because the pattern signals are displayed on the upper and lower panels. It becomes less noticeable. Also, the third
The fourth embodiment requires a line for inserting the reference signal in the video signal, as compared with the first and second embodiments, but has the advantage that the pattern signal can be changed on the transmitting side. is there.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a first embodiment of the present invention.

FIG. 2 is a block diagram of a main part of a second embodiment of the present invention.

FIG. 3 is a block diagram of an essential part of a third embodiment of the present invention.

FIG. 4 is a block diagram of an essential part of a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a letterbox screen used in the present invention.

FIG. 6 is an operation explanatory diagram of the present invention.

FIG. 7 is an operation explanatory diagram of the present invention.

FIG. 8 is an operation explanatory diagram of the present invention.

FIG. 9 is an explanatory diagram of comparison between a wide aspect image and a current television image.

FIG. 10 is an explanatory diagram of signals of upper and lower panels in a conventional example.

FIG. 11 is an explanatory diagram of signals of upper and lower panels in a conventional example.

[Explanation of symbols]

 3 pattern signal generator 4 adder 9 control circuit 10 pattern signal generator 11 subtractor 14 memory

Claims (4)

[Claims] 1. A wide aspect television signal transmitting apparatus which is compatible with the NTSC television system, wherein upper and lower portions of a screen are set as non-image portions and an auxiliary signal for high image quality is multiplexed and transmitted. A television signal transmitting apparatus comprising: signal generating means for generating a predetermined pattern signal for superimposing on the non-picture part, and auxiliary signal multiplexing means for multiplexing the auxiliary signal on the pattern signal. . 2. An NTSC television system-compatible with an upper and lower part of the screen as a non-image part, and superimposing a predetermined pattern signal on the non-image part, and assisting to improve the image quality on the pattern signal. A signal for preliminarily storing the pattern signal and generating the pattern signal in a wide aspect television signal receiving apparatus for reproducing a television signal transmitted by multiplexing signals to obtain a high quality wide aspect image. From the generation means, the timing control means for controlling the generation timing of the pattern signal, and the pattern signal superimposed on the non-image part of the received television signal,
A television signal receiving device comprising: an auxiliary signal extracting device that subtracts a pattern signal obtained from the signal generating device provided on the receiving device side to extract the auxiliary signal. 3. A wide aspect television signal transmitting apparatus which is compatible with the NTSC television system and which transmits an auxiliary signal for high image quality by multiplexing the upper and lower portions of the screen as non-image portions and transmitting them. Signal generating means for generating a pattern signal for superimposing on the non-picture part, and superimposing the pattern signal as a reference signal on a vertical blanking period of a television signal or on a predetermined specific line of a vertical overscan section. A television signal transmitting apparatus comprising: a pattern signal superimposing means; and an auxiliary signal multiplexing means for multiplexing the auxiliary signal on the pattern signal to be superimposed on the non-picture part. 4. Compatible with the NTSC television system, the upper and lower parts of the screen are non-image parts, a pattern signal is superimposed on the non-image parts, and an auxiliary signal for high image quality is multiplexed on the pattern signals. At the same time, using the above-mentioned pattern signal in which the auxiliary signal is not multiplexed as a reference signal, the television signal transmitted by being superimposed on a predetermined specific line of the vertical retrace period or vertical overscan section of the television signal is reproduced. In a wide aspect television signal receiving apparatus for obtaining a high quality wide aspect image, a pattern signal storage generation means for storing a pattern signal on which the auxiliary signal transmitted as the reference signal is not superimposed and for generating the stored pattern signal , A control means for controlling the timing at which the pattern signal is taken in and a pattern superimposed on the non-image part where the auxiliary signal is multiplexed. A television signal receiving device, comprising: an auxiliary signal extracting means for extracting the auxiliary signal by subtracting the pattern signal from the pattern signal storing and generating means from the local signal.