JPS62263782A - High definition television receiver - Google Patents

Abstract

PURPOSE:To effectively use a screen without omission of an existing standard television signal by projecting character information on a part on which the video of the screen of a cathode ray tube is not displayed when projecting the existing standard television signal. CONSTITUTION:When projecting the video of the existing standard television by a high definition display, the part on which the video at both side ends of the screen is not produced is effectively used without omission of the video of vertical both ends of the screen due to the difference of the aspect ratio. Namely, the screen 11 of the high definition display has a part 12 for projecting the video of the existing standard television and a part 13 for projecting the character information. A character multiple signal respectively superimposed on the first character information signal inputted to an external device signal input terminal 23, an existing standard television signal inputted to a terminal 21 and a high definition television signal inputted to a terminal 22 is processed in a character multiple signal separation processing circuit 25 and the obtained second character information signal and the third character information from a character information generating circuit 26 in a receiver are inputted to a character information selection circuit 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high definition television receiver.

Conventional technologyHigh-definition television displays detailed television images on a large widescreen screen, seeking new appeal such as power and realism that cannot be obtained with current television broadcasting, and has been gaining popularity in recent years. , interest is increasing in all countries. This high-definition television was proposed by the Japan Broadcasting Corporation (NHK) and has a screen aspect ratio of 5:3 (
or 18:9) (hereinafter referred to as 5:3), with 1125 scanning lines, and the current standard TV (aspect ratio 4:3,
(525 scanning lines).

FIG. 4 shows a schematic configuration for displaying current standard television signals on a conventional high-definition television receiver. Connect the current standard television signal to the current standard television signal input terminal♀
41, and then converts the scanning line to 6 by the signal conversion circuit 43.
Scan conversion is performed to double the number of lines from 25 to 1050 lines. Then, a switching circuit 44 switches between this converted signal and a high-definition television system signal, and the signal is displayed on a high-definition display 43.

Next, FIG. 3 shows a state in which a current standard television signal scan-converted is displayed on a high-definition display. In Fig. 3, numeral 31 is a high-quality display screen with an aspect ratio of 6:3, and the aspect ratio 4: which has been scan-converted from this screen.
Since the aspect ratio is different from the current standard TV signal of 3, the screen of the current standard TV when the vertical length of the screen is the same, and the screen of the current standard TV when the horizontal length of the screen is the same. 33 are respectively displayed on a high-definition display 46 as shown in FIGS. 3a and 3b.

Problems to be Solved by the Invention However, when the current standard television image is projected on the high-definition display 46 with the above-described configuration, as shown in Figure 3B, there will be images at both left and right ends (shaded areas) of the high-definition display screen. There are problems such as no image being displayed or, as shown in Figure 3, both the upper and lower ends (hatched areas) of the current standard television image being not displayed, resulting in missing necessary images.

In view of the above-mentioned problems, the present invention has been developed so that when displaying current standard TV images on a high-definition display, the images at both the left and right ends of the screen are displayed without missing the images at both the top and bottom ends of the screen due to the difference in aspect ratio. This is an attempt to make effective use of what is not available.

Means for Solving the Problems In order to solve the above-mentioned problems, the high-definition television receiving device of the present invention uses current standard television images that have been scan-converted to a cathode ray tube capable of displaying high-definition television system signals. In addition, character information of the character multiplex signal superimposed on the high-definition television signal and the current standard television signal, and external equipment are displayed on the portion where the left or right image on the cathode ray tube screen does not occur due to the difference in aspect ratio. It is characterized in that at least one of the character information input from the receiver and the character information provided from the internal circuit of the receiver is displayed.

Effect of the Invention With the above-described configuration, when displaying a current standard television image on a high-quality Tenvisitan receiving device, the vertical length of the screen is made the same so that the image at both the upper and lower ends of the screen is not missing. Let either the left or right end of the image be the part where no image is generated. Then, any character information is selected from among the character information obtained from the character multiplex signal, the character information input from an external device, and the character information provided from the internal circuit of the receiving device, and displayed on this part. It is possible to effectively utilize the part that does not produce an image.

Embodiment Hereinafter, a high-definition television receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an image projected on a cathode ray tube screen of a high-definition television receiver according to an embodiment of the present invention.

In Fig. 1, 11 is a high-definition display screen, 12
13 is a portion for displaying current standard television images, and 13 is a portion for displaying text information.

FIG. 2 is a schematic diagram of a high-definition television receiving apparatus according to an embodiment of the present invention. In the figure, 23 is an external device signal input terminal, 25 is a separation processing circuit for character multiplexed signals included in current standard television signals and high-definition television signals, 26 is a character information generation circuit, and 27 is character information 1 from the external device. a character information selection circuit that selects character information from the character multiplex signal from the separation processing circuit 25 and one character information generation circuit 26 and outputs one of them; 28 is a composite screen creation circuit;
Reference numeral 20 denotes a video single character replacement control circuit, and other input terminals 21, 22 . Signal conversion circuit 24° switching circuit 29. The high-quality display 3o is similar to the conventional example shown in FIG.

The high-definition television receiving apparatus configured as above will be explained below with reference to FIGS. 1 and 2.

The current standard television signal input from the current standard television signal input terminal 21 is subjected to signal conversion processing such as scan conversion by the signal conversion circuit 24 and is input to the composite screen creation circuit 28 .

On the other hand, the first character information signal input from the external device signal input terminal 23, the current standard television signal input terminal 21
The character multiplex signal which is superimposed on the current standard television signal inputted to the input terminal 22 and the high-definition television signal inputted from the high-definition television signal input terminal 22 is processed by the character multiplexed signal separation processing circuit 25, and the resulting signal is obtained. Second character information signal and character information generation circuit 26 inside the receiving device
All of the third various character information signals provided by the character information selection circuit 27 are input to the character information selection circuit 27. In this character information selection circuit 27, the first . Second. One of the third character information signals is input to a composite screen creation circuit 28 and is combined with the current standard television signal processed by the signal conversion circuit 24.

When this synthesized video is supplied to the high-definition display 3o of the high-definition television receiving device in place of the high-definition television signal by the switching circuit 29, the entire video of the current standard television signal is lost as shown in FIG. The character information signal desired by the user of the receiving device can be displayed in the space on either the left or right side of the screen caused by the difference in aspect ratio, without causing any interference.

In addition, according to the control signal from the video 9 character replacement control circuit 20, character information is displayed in the main display area 12 of the current standard television video shown in FIG. By increasing the number of channels or input terminals 21, multiple channels can be displayed in a small inch size, and character information can also be provided on a large screen.

Effects of the Invention As described above, according to the present invention, when displaying the current standard television signal on a high-definition television receiver, text information and sound-to-image ratio are displayed on either the left or right side of the CRT screen where no image is displayed. By configuring it to do so, it is possible to effectively utilize the cathode ray tube surface without causing any dropout of the current standard television signal.

[Brief explanation of drawings]

FIG. 1 shows the display state of a high-definition television receiver according to an embodiment of the present invention. 2 is a block diagram showing a schematic configuration of the device, FIGS. 3z and 3b are diagrams showing the state in which all current standard television signals are displayed on a conventional high-definition television receiver, and FIG. 4 1 is a block diagram showing a schematic configuration of a conventional high-definition television receiving device. 11...High quality display, 12...
・Current standard TV video projection section, 13...Text information display section, 24...Signal conversion circuit, 25...
... Character multiplex signal separation processing circuit, 26 ... Character information generation circuit, 27 ... Character information selection circuit, 28
...Synthetic screen creation circuit, 29 ...Switching circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 f--1 yam-) Kandeos 7° and 112-- TL
Figure 3

Claims (1)

[Claims] A signal conversion circuit that performs signal conversion such as scan conversion on the current standard television broadcast signal having a different aspect ratio from the high definition television system signal, and first character information obtained from the superimposed character multiplex signal;
a character information selection circuit that selects and outputs any one of second at least one character information inputted from at least one external device and third character information generated from an internal circuit of the receiving device; The current standard television video signal output from the conversion circuit is projected on the left or right side of a display screen that can display high-definition television format images, and the space on the right or left side of the display screen that is created due to the difference in aspect ratio is A high-definition television receiving device includes a composite screen creation circuit that composites selected character information so as to display it.