JPH05167945A - Image receiver having slave screen display function - Google Patents

Abstract

PURPOSE:To display a slave screen receiving a high vision image in a master screen receiving an NTSC system image so as to easily observe the slave screen. CONSTITUTION:When a muse-NTSC down converter 1 is outputting a full screen display signal, a system control computer 5 controls a picture-in-picture control circuit 2 so that a picture output having a shape of 4:3 which is outputted from the converter 1 is converted into a picture output having a shape of 16:9 to obtain an easily observable slave screen. When the converter 1 outputs the other screen display signal, the circuit 2 outputs an input signal as it is.

Description

Detailed Description of the Invention

[0001]

The present invention relates to high-definition broadcasting for N
The present invention relates to a receiver including a Muse-NTSC down converter for receiving an image with a TSC receiver and having a small screen display function capable of displaying a small screen in a main screen.

[0002]

2. Description of the Related Art Hi-vision test broadcasts are currently being conducted, and main broadcasts are scheduled in the near future. Therefore, various Hi-vision receivers have been proposed. The HDTV receiver is very different from the conventional NTSC system in that the image is sharp and the image is displayed on a 16: 9 wide screen.

Since such a high-definition television receiver is currently available at a price of several million yen and cannot be easily purchased, the high-definition television receiver can receive the high-definition television broadcast in the conventional high-definition television receiver. There is also proposed a down converter for converting a muse signal, which is a signal for use in a television, into an NTSC signal. By using this converter, you can watch high-definition broadcasts on a conventional NTSC receiver.

By the way, recent receivers have been provided with a sub-screen display function for displaying another broadcast as a sub-screen while watching a certain broadcast screen. When such a receiver is used, a high-definition broadcast screen can be displayed as a sub-screen in the main screen.

[0005]

However, although a high-definition screen has a horizontal-to-vertical ratio of 16: 9, a normal receiver for receiving NTSC radio waves has a value of 4: 3.
Therefore, since the Muse-NTSC down converter outputs an output signal whose horizontal width is compressed, it may be displayed as a vertically long screen depending on the contents of the screen displayed on the sub screen, which makes the screen difficult to see. Had a problem.

The present invention has been made in view of such a situation, and it is an object of the present invention to prevent the sub-screen from being difficult to see even if it is displayed in the main screen.

[0007]

In order to solve such a problem, a receiver having a child screen display function according to claim 1 is
In a receiver having a function of displaying a sub screen in a main screen, an output signal of the Muse-NTSC down converter 1 for converting a muse signal into an NTSC signal and an output signal of the muse-NTSC down converter 1 in the main screen are set to 1
It is characterized by including a picture-in-picture control circuit 2 for displaying as a child screen having an aspect ratio of 6: 9.

In the receiver having the child screen display function of claim 2, the picture-in-picture control circuit 2 displays the output of the Muse-NTSC down converter 1 by selecting an aspect ratio of 4: 3 or 16: 9. It is characterized by doing.

According to another aspect of the invention, there is provided a receiver having a sub-picture display function, wherein the picture-in-picture control circuit 2 stops the display of the sub-picture for a certain period of time when selecting an aspect ratio.

[0010]

In the receiver having the child screen display function according to claim 1, the Muse-NTSC down converter 1
The picture-in-picture control circuit 2 converts the signal output from the picture signal into a signal having an aspect ratio of 16: 9 and is displayed in the main screen, so that the sub-screen is displayed in a natural form.

According to another aspect of the present invention, there is provided a picture-in-picture control circuit 2 for a receiver having a child screen display function.
Outputs the output of Muse-NTSC down converter 1:
Since the aspect ratio of 3 or 16: 9 is selected and displayed, the sub-screen having the optimum aspect ratio is displayed depending on the operation mode of the Muse-NTSC down converter.

According to another aspect of the invention, the picture-in-picture control circuit 2 is provided.
Since the display of the sub screen is stopped for a certain time when the aspect ratio is selected, the sub screen does not become difficult to see when switching.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention. A Muse-NTSC down converter 1 converts a muse signal into an NTSC signal and outputs its output through a picture-in-picture control circuit 2. Are supplied to the image amplification / amplification circuit 3 to be displayed as a child screen. On the other hand, the television signal is given to the video amplifier circuit 3 via the changeover switch 6 as a parent screen signal.

As a result, on the screen of the CRT 4, the NTSC system broadcast becomes the master screen, and the screen of the high-definition broadcast is displayed as the slave screen in the master screen. At this time, the Muse-NTSC down converter 1 is under output mode control by the system control computer 5.

That is, the high-definition broadcast compresses the band as a muse signal, and is further transmitted as a screen having a ratio of 16 in the horizontal direction and 9 in the vertical direction as shown in FIG. However, since the NTSC system receiver cannot receive the muse signal as it is, the muse signal is converted by the muse-NTSC down converter 1 so that it can be received by the NTSC receiver. At this time, a screen having a ratio of horizontal 4 vertical 3 is made to fit the screen of the NTSC system, but there are three types of conversion methods, full screen display, wide screen display, and zoom screen display.

That is, the full screen mode in which the entire muse screen is displayed on the entire 4: 3 screen as shown by the symbol (b) in FIG. 2, and the lateral direction of the muse screen is as shown by the symbol (c) in FIG. Wide screen mode in which the screen is fully displayed in the horizontal direction of 4: 3, and only the portion that can be displayed in the 4: 3 screen is cut out from the screen of FIG. : 3, there is a zoom screen mode for displaying on the entire screen, and which mode to operate is determined by the output mode control of the system control computer 5.

The system control computer 5 also supplies the picture-in-picture control circuit 2 with 4: 3/1.
6: 9 switching control is performed, and Muse-NT
When the SC down converter 1 outputs a signal for full screen display as shown in FIG.
The in-picture control circuit 2 performs control such that the time axis is changed to 16: 9. As a result,
As shown in (e), since a high-definition sub-screen having a 16: 9 shape is displayed in the main screen having a 4: 3 shape in the NTSC system, the sub-screen has a natural aspect ratio. The displayed image is also displayed in a natural form.

When the Muse-NTSC down converter 1 is outputting the signal for performing the wide screen display shown in FIG. 3C or the signal for performing the zoom screen processing shown in FIG. 3D. The system control computer 5 controls the signal output from the picture-in-picture control circuit 2 to have a 4: 3 shape. That is, the picture-in-picture control circuit 2 controls so as to output the input signal as it is.

As a result, when the Muse-NTSC down converter 1 outputs the signal for performing the wide screen display shown in FIG. 3 (c), it is 4: 3 as shown in FIG. 3 (f).
The wide-screen-displayed child screen is displayed in the shape of 4: 3 in the parent screen having the shape. Further, when the signal for performing the zoom screen display shown in FIG. 3 (d) is output, as shown in FIG. 3 (g), the parent screen having a shape of 4: 3 has a ratio of 4: 3.
The sub screen displayed in the zoom screen is displayed in the shape of.

Further, when the aspect ratio of the sub-screen is changed to 16: 9 or 4: 3, the system control computer 5 does a picture-in for a certain period in order to prevent the sub-screen from being disturbed and becoming difficult to see. -The picture control circuit 2 is controlled to delete the small screen so that the small screen is not displayed. Then, after the stable display becomes possible, the sub screen is displayed again.

In the above embodiment, the high-definition sub-screen is displayed on the NTSC main screen, but by operating the changeover switch 6, the VT is displayed.
It is also possible to use the R image or the high-definition image as the main screen.

FIG. 2 is a flow chart for explaining the above-mentioned operation. In step 100, the system control computer 5 judges that the muse is ON / OFF signal from the muse-NTSC down converter 1 and the muse is in the step. If it is determined in 101 that the user has changed the output mode, step 1
In 02, it is determined whether or not the output mode is a change for performing full screen display.

If it is determined in step 102 that the change is for full screen display, the sub screen is erased for a certain period of time as shown in step 104, and the aspect ratio of the sub screen is changed from 4: 3 to 16: 9. , And controls to display the inset screen again after the elapse of the certain time. As a result, the new child screen is displayed as a figure similar to the high-definition screen, as shown in FIG.

When the system control computer 5 determines in step 102 that the output screen is not in the full screen mode, it determines in step 103 whether it was previously displayed in full screen. If it is determined that the full screen is displayed, in step 105, the small screen is erased for a certain period of time, the aspect ratio of the small screen is changed from 16: 9 to 4: 3, and after the certain period of time, a new small screen is newly displayed. Is displayed.

When it is determined in step 103 that the previous screen is not the full screen display, the child screen is controlled to remain at 4: 3 as shown in step 106.

[0026]

As described above, the receiver having the child screen display function according to the first aspect displays the Muse-NTSC down converter output signal as a child screen having an aspect ratio of 16: 9. , It has an effect that the image of the small screen is displayed in a natural state.

In the receiver having the child screen display function according to claim 2, the picture-in-picture control circuit outputs the Muse-NTSC down converter output at 4: 3.
Alternatively, since the aspect ratio of 16: 9 is selected and displayed, there is an effect that a child screen having an optimum shape can be displayed in conformity with the conversion operation of the converter.

In the receiver having the sub-screen display function according to the third aspect, when the aspect ratio is selected, the display of the sub-screen is stopped for a certain period of time. It has the effect of not being disturbed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a receiver having a child screen display function to which the present invention is applied.

FIG. 2 is a flow chart for explaining the operation of the device shown in FIG.

FIG. 3 is a diagram showing an example of a screen displayed by the device of FIG.

[Explanation of symbols]

 1 Muse-NTSC down converter 2 Picture-in-picture control circuit 3 Video amplification circuit 4 CRT 5 System control computer 6 Changeover switch

Claims (3)

[Claims] 1. A receiver having a function of displaying a small screen on a main screen, comprising a muse-NTSC down converter for converting a muse signal to an NTSC signal and a muse-NTSC down converter output signal on the main screen. A receiver having a sub-picture display function, comprising a picture-in-picture control circuit for displaying as a sub-picture having an aspect ratio of 16: 9. 2. The picture-in-place according to claim 1,
The picture control circuit is a receiver having a sub-screen display function, characterized in that the Muse-NTSC down converter output is displayed by selecting an aspect ratio of 4: 3 or 16: 9. 3. The receiver according to claim 2, wherein the display of the small screen is stopped for a certain period of time when the aspect ratio is selected.