JP3258754B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of displaying television signals having different aspect ratios on a screen.

[0002]

2. Description of the Related Art Hi-vision, which is the next-generation high-definition television, is being broadcast in satellite broadcasting. This Hi-Vision signal is band-compressed by a band compression technique called the MUSE method. The compressed signal (hereinafter, referred to as a MUSE signal) is being broadcast.

[0003] However, this MUSE broadcast is not compatible with the current television broadcast, and therefore the current 4: 3 broadcast is not compatible.
Cannot be received by a television receiver having an aspect ratio of

[0004] In order to watch this MUSE broadcast on a normal NTSC television receiver, the MUS system must be used.
There is an E / NTSC down converter. This MUSE /
The NTSC down converter converts the MUSE signal to NTSC
Convert to a signal. The operation of the MUSE / NTSC down converter is described in pages 31 to 4 of the magazine "Television Technology October 1989" published by Electronic Technology Publishing Co., Ltd.
It is described on page 5.

On the other hand, an aspect ratio at which a high-vision signal obtained by decoding a MUSE signal can be directly displayed is 16:15.
Nine hi-vision receivers have been developed. However, the current television signal cannot be displayed on this high-vision receiver.

Therefore, there is an NTSC / MUSE up-converter for viewing a current television signal on a high-vision receiver. This NTSC / MUSE up-converter converts an NTSC signal into a MUSE signal. still,
These technologies are described, for example, in NEC Technical Bulletin, Vol. 38, No. 5, published on April 25, 1975 by NEC Corporation.
1985 ", pp. 37-40.

[0007] When a high-vision signal converted by a MUSE / NTSC converter is displayed on a television receiver having an aspect ratio of 4: 3, there is a method as shown in FIG.

There are a method (a) for displaying a horizontally long screen by providing blanking regions on the upper and lower sides, and a method (b) for cutting the left and right video signals and displaying the upper and lower video signals fully.

When displaying an NTSC signal converted by the NTSC / MUSE up-converter on a television receiver having an aspect ratio of 16: 9, there is a method shown in FIG.

In this case, a blanking area is provided on the left and right to display a 4: 3 screen (a), and a method in which the upper and lower video signals are cut and the left and right are displayed full (b).
It is.

In the above-described display method, the display method in which the upper, lower, left, and right portions of the video signal are partially cut has a problem that a part of the video becomes invisible. In order to solve the problem, there has been proposed a device in which a region for displaying a video signal can be changed.

According to this, since the user can select an area to be displayed, when the user performs a tilt or pan operation, the center of the entire image cannot be recognized, and necessary information is not obtained. There is a problem that the display part of "" is overlooked.

[0013]

SUMMARY OF THE INVENTION According to the present invention, in order to solve the above-mentioned problems, the center of the image is displayed with a marker so that the user can always know the center of the image. The purpose is to make the user aware of the area in which they are located.

[0014]

SUMMARY OF THE INVENTION The present invention is directed to a television receiver capable of receiving and displaying television signals having different aspect ratios, wherein the aspect ratio of the display section of the television receiver is different. Scanning line number conversion means for converting the number of scanning lines so that a television signal having an aspect ratio is not displayed on a screen of a display unit without an image without an image, and a center for the image displayed on the display unit. Character display means for generating a character indicating the position of the image, and when displaying the image of the television signal obtained from the scanning line number conversion means on the display unit, the display signal is out of the range that can be displayed on the display unit. Movement control means for enabling the image to be moved up and down or left and right with respect to the display unit so that the image can be displayed; Character display means for always displaying a character generated by the character at the center position of the image of the television signal obtained from the line number conversion means with respect to the image in the center portion, the character display means comprising: A television receiver, wherein the character is moved so that the character is always located at the center of the image, in conjunction with the movement of the image by the movement control means.

[0015]

According to the present invention, the center of an image is always detected from the horizontal and vertical synchronizing signals, and the center of the image is displayed by a marker or the like based on the detection output. Make them aware.

[0016]

An embodiment will be described below with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. In this embodiment, N
An example will be described in which an NTSC signal is displayed on a high-vision receiver using a TSC / MUSE upconverter.

In FIG. 1, 1 is a Y / C separation circuit for separating a luminance signal and a chrominance signal, 2 is an A / D conversion circuit for analog / digital conversion of a luminance signal and a chrominance signal, and 3 is a synchronization separation circuit and a synchronization signal. A generating circuit, 4 is a character ROM for generating a marker indicating the center of the video, 5 is a buffer memory, 6
When converting an NTSC signal into a Hi-Vision signal, an interpolation circuit for interpolating the number of scanning lines to match the number of scanning lines of the Hi-Vision signal, a D / A conversion circuit 7 for digital / analog conversion, a deflection circuit 8 and a deflection circuit 9 Denotes a CRT (cathode ray tube), 10 denotes a switch, and 11 denotes a control circuit.

Next, the operation of the present invention will be described. In FIG. 1, when an NTSC video signal is input, Y / C
The separation circuit 1 separates the luminance signal and the color signal. Then, each signal is converted into a digital signal by the A / D conversion circuit 2.

Thereafter, the data is input to the buffer memory 5 via the switch SW, and the number of scanning lines is increased by the interpolation circuit 6 so that the number of scanning lines becomes a scanning line corresponding to a high-vision signal.

The interpolation circuit 6 produces an NTSC signal having the same number of scanning lines as the Hi-Vision signal.
This signal is read from the interpolation circuit 6, converted into an analog signal by the D / A conversion circuit 7, and displayed on the CRT. As described in the related art, there are two types of display at this time. However, in the method of cutting the top and bottom, the top and bottom of the screen are not displayed as shown in FIG.

Therefore, functions such as tilt and pan are provided so that the upper and lower screens can be seen. In the operation, when the operator gives an instruction to move the screen up and down with a remote controller or the like (not shown), the control circuit 11 changes the read timing and position of data from the interpolation circuit 6. For example, when the screen is shifted upward as shown in FIG. 2B, data from the middle of the screen is output from the interpolation circuit 6 and displayed.

On the other hand, a sync separation circuit & sync signal generation circuit 3
Separates a synchronization signal from an input video signal, and generates a synchronization signal corresponding to HDTV based on the separated signal.

Then, the generated HDTV synchronization signal is supplied to the deflection circuit 8 so as to perform a deflection operation. The control circuit 11 is also supplied with a high-definition synchronizing signal, and generates various control signals based on the synchronizing signal.

Next, the character ROM 4 stores a character indicating a mark so that the center of the screen can be recognized. When the operator wants to know the center position of the screen, he or she gives an instruction with a remote controller or the like (not shown). The control circuit 11 determines the scanning line at the center position of the screen, reads out the character data of the marker in the character ROM 4 based on the timing, and controls the switch SW to switch to the character ROM 4 side.

When the marker is being output, the control circuit 11 stops the interpolating circuit 6 and outputs the marker.
It is controlled so as to be displayed on T9.

The marker may be displayed as shown in FIG. For example, when the screen is displayed with the center at the center, the screen becomes as shown in FIG. 2A, and when the entire lower side of the screen is displayed, it becomes as shown in FIG. 2B.

Since the marker is always displayed in FIG. 2 as described above, it is difficult for the operator to know whether or not the marker is located at the center of the screen (in the case of FIG. 2A). ). Therefore, the color or shape of the marker may be changed for easy understanding, or the marker may be blinked. This determination can be realized by counting the number of upper and lower scanning lines and, if they are equal, a method of detecting that the scanning line is exactly at the center.

Also, as can be seen when the entire lower side is displayed as shown in FIG. 2B, the color of the marker is changed, the marker is blinked, or the shape of the marker is changed. Good.

[0029]

According to the present invention, when a video signal is displayed off the screen and the screen is tilted and panned,
Since the user can know at a glance which area of the original image is the screen, and furthermore, knows the area that is not displayed, there is an effect that the information can be viewed without missing information.

[Brief description of the drawings]

FIG. 1 shows a block diagram of the present invention.

FIG. 2 shows a display state of a screen of the present invention.

FIG. 3 is a diagram for explaining a conventional screen display state.

FIG. 4 is a diagram for explaining a conventional screen display state.

[Explanation of symbols]

 Reference Signs List 1 Y / C separation circuit 2 A / D conversion circuit 3 Synchronization separation circuit & synchronization signal generation circuit 4 Character ROM 5 Buffer memory 6 Interpolation circuit 7 D / A conversion circuit 8 Deflection circuit 9 CRT 11 Control circuit SW switch

Claims (1)

(57) [Claims] 1. A television receiver capable of receiving and displaying a television signal having a different aspect ratio, wherein the television signal having the different aspect ratio is compared with an aspect of a display unit of the television receiver. Scanning line number conversion means for converting the number of scanning lines so as not to display a non-image area having no image on the screen of the display unit, and generating a character indicating a center position with respect to the image displayed on the display unit Character display means, and when displaying an image of a television signal obtained from the scanning line number conversion means on the display section, it is possible to display an image that is out of a displayable range on the display section. The image up and down with respect to the display unit, or
A movement control means for moving the character to the left and right; and a character generated by the character at the center position of the image of the television signal obtained from the scanning line number conversion means, which is always displayed at the center of the image. Character display means for moving the character so that the character is always at the center of the image in conjunction with movement of the image by the movement control means. A television receiver characterized by being made as described above.