JPH06311452A - Television receiver - Google Patents

Abstract

PURPOSE:To enable discriminating to which area of an original image a screen belongs by normally detecting the central part of an image from a horizontal and a vertical synchronizing signals and displaying the central part of the image by means of a marker, etc. CONSTITUTION:When an NTSC system video signal is inputted, a luminance signal and a chrominance components are separated by a Y/C separating circuit 1. Then, the respective signals are converted into a digital signal by an A/D converting circuit 2 and inputted to a buffer memory 5, their scanning line number is increased so as to be the one corresponding to a high-vision signal by an interpolating circuit 6 and the signal is converted into an analog signal by a D/A converting circuit 7 so as to be displayed in CRT 9. A character ROM 4 stores a character indicating a mark which shows the center of the screen. When an operator wants to know the central position of the screen and indicates it by a remote controller, etc., a control circuit 11 discriminates the scanning line of the central position of the screen, reads character data and controls a switch SW to be changed-over to a character ROM 4 side.

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 a next-generation high-definition television, is being broadcast in satellite broadcasting. This high-definition signal is band-compressed by a band-compression technique called MUSE system. Then, this compressed signal (hereinafter referred to as MUSE signal) is broadcast.

However, since this MUSE broadcasting is not compatible with the current television broadcasting, the current 4: 3 is used.
It cannot be received by a television receiver with an aspect ratio of.

Therefore, in order to watch this MUSE broadcasting on a normal NTSC television receiver,
There is an E / NTSC down converter. This MUSE /
NTSC down converter converts MUSE signal to NTSC
Convert to signal. Regarding the operation of this MUSE / NTSC down converter, pages 31 to 4 of the magazine "TV Technology October 1989" published by Electronic Technology Publishing Co., Ltd.
It is explained on page 5.

On the other hand, the aspect ratio of the high-definition signal obtained by decoding the MUSE signal is 16:
Nine Hi-Vision receivers have been developed. However, this high-definition television cannot display the current television signal.

Therefore, there is an NTSC / MUSE up-converter for viewing a current television signal on a high-definition television receiver. This NTSC / MUSE up-converter converts an NTSC signal into a MUSE signal. still,
These techniques are described in, for example, “NEC Technical Report Vol. 38 NO5.
1985, pp. 37-40.

By the way, when displaying a high-definition signal converted by the MUSE / NTSC converter on a television receiver having an aspect ratio of 4: 3, there is a method as shown in FIG.

There are a method of displaying a horizontally long screen by providing blanking areas on the upper and lower sides (a), and a method of cutting the left and right video signals to display 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 of cutting the upper and lower video signals to display the left and right in full (b).
Is.

In the display method as described above, in which the upper and lower sides and the left and right sides of the video signal are partially cut, there is a problem that a part of the video becomes invisible. In order to solve the problem, it is proposed that the display area of the video signal can be changed.

According to this, since the user can select the area to be displayed, when the user performs a tilt or pan operation, the central portion of the entire image becomes unclear and necessary information is displayed. There was a problem that the display part of was overlooked.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention displays a center portion of a video image with a marker so that the user can always see the center portion of the image, and displays it to the user. The purpose is to make the area in which it exists known.

[0014]

According to the present invention, in a television receiver capable of receiving and displaying television signals having different aspect ratios, the number of scanning lines capable of displaying television signals having different aspect ratios. Scanning line number converting means for converting to, a character generating means for generating a character indicating the position of the screen displayed on the television receiver, and a character display in the central portion of the television signal obtained from the scanning line number converting means. And a display means for displaying the television receiver.

[0015]

With the above-described structure, the present invention always detects the central portion of the image from the horizontal and vertical synchronizing signals, displays the central portion of the image with a marker or the like based on the detection output, and displays it to the user. Make them aware.

[0016]

Embodiments 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-definition television receiver using a TSC / MUSE up converter.

In FIG. 1, 1 is a Y / C separation circuit for separating a luminance signal and a color signal, 2 is an A / D conversion circuit for converting a luminance signal and a color signal from analog to digital, and 3 is a synchronization separation circuit & a synchronization signal. A generation circuit, 4 is a character ROM for generating a marker indicating the center of an image, 5 is a buffer memory, 6
Is an interpolation circuit for interpolating the signal in order to match the number of scanning lines with the number of scanning lines of the high-definition signal when converting the NTSC signal to the high-definition signal, 7 is a D / A conversion circuit for digital / analog conversion, 8 is a deflection circuit, 9 Is a CRT (cathode ray tube), 10 is a switch, and 11 is 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.

After that, the number of scanning lines 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-definition signal.

Then, the interpolating circuit 6 produces an NTSC system signal having the same number of scanning lines as the high-definition signal,
This signal is read from the interpolation circuit 6 and converted into an analog signal by the D / A conversion circuit 7 and displayed on the CRT. There are two types of display at this time, as described in the prior art, but the method of cutting the top and bottom does not display the top and bottom of the screen as shown in FIG.

Therefore, functions such as tilt and pan are provided so that the upper and lower screens can be viewed. 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 timing and position of reading 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, the sync separation circuit & sync signal generation circuit 3
Separates a sync signal from the input video signal and generates a sync signal compatible with high-definition based on the separated signal.

Then, the generated high-definition synchronizing signal is supplied to the deflection circuit 8 to perform the deflection operation. The high-definition synchronizing signal is also supplied to the control circuit 11, and various control signals are generated based on the high-definition synchronizing signal.

Next, the character ROM 4 stores a character indicating a mark for identifying the center of the screen, and when the operator wants to know the center position of the screen, he / she gives a command with a remote controller or the like (not shown). The control circuit 11 discriminates the scanning line at the center position of the screen, reads the character data of the marker of the character ROM 4 based on the timing, and the switch SW is also controlled so as to switch to the character ROM 4 side.

When the marker is output, the control circuit 11 stops the interpolation circuit 6, and the marker output is CR.
The display is controlled to T9.

The marker may be displayed as shown in FIG. For example, when the screen is displayed centering on the center, it is as shown in FIG. 2 (a), and when the entire lower part of the screen is displayed, it is as shown in FIG. 2 (b).

As described above, since the marker is always displayed in FIG. 2, it is difficult for the operator to know whether the marker is exactly at the center position 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 scanning lines to be cut in the upper and lower sides and equalizing it if a method of detecting that the scanning lines are exactly in the center is taken.

Further, as shown in FIG. 2B, it is possible to change the marker color, blink the marker, change the shape of the marker, etc. so that it can be seen when the entire lower side is displayed. Good.

[0029]

According to the present invention, when the video signal is displayed as if it is off the screen and the screen is tilted and panned,
Since it is possible to know at a glance which area of the original image the screen is and the area that is not displayed, it is possible to view without missing information.

[Brief description of 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]

 1 Y / C separation circuit 2 A / D conversion circuit 3 Sync separation circuit & sync 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 (2)

[Claims] 1. A television receiver capable of receiving and displaying television signals having different aspect ratios, wherein the television signals having the different aspect ratios have a number of scanning lines which can be displayed by the television receiver. The scanning line number converting means for converting, the character generating means for generating a character indicating the position of the screen displayed on the television receiver, and the character in the central portion of the television signal obtained from the scanning line number converting means. And a display means for displaying. 2. The television receiver according to claim 1, further comprising control means for controlling the character to be different depending on a screen position.