JPH05244525A - Tv system converter - Google Patents

Abstract

PURPOSE:To display a superimposing character inserted to upper and lower parts of a screen when a TV pattern of the NTSC system is converted into a TV pattern of the HDTV system by interpolating and magnifying the TV pattern of the NTSC system in the horizontal and vertical directions respectively. CONSTITUTION:A picture memory section 3 stores a TV signal S1 of the NTSC system as picture data. A memory control section 4 applies read control to picture data to convert the TV signal of the NTSC system into a TV signal of the HDTV system. A character detection section 1 receives the TV signal S1 to detect whether or not a superimposing character is in existence in a pattern range designated by a range designation signal C1. When a detection signal C2 indicates the presence of the superimposing character, a read range designation section 2 moves a read position by a range including the superimposing character and generates a signal C3 representing a read range in the vertical direction so as to display the superimposing character onto a pattern. The memory control section 4 controls the read to the picture data of a range designated by the signal C3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV system converter,
In particular, by controlling the reading of the image data stored in the image memory, the NTSC TV signal can be transmitted to the HDTV.
The present invention relates to a TV system converter for converting a system TV signal (high-definition TV signal).

[0002]

2. Description of the Related Art An NTSC TV screen has a number of effective scanning lines of 483 and an aspect ratio (aspect ratio of the screen) of 4: 3. An HDTV TV screen has a number of effective scanning lines of 1035.
The book has an aspect ratio of 16: 9.

Therefore, conventionally, when converting an NTSC system TV signal into an HDTV system TV signal, the NTSC system
Complements the TV screen of the HDTV system by doubling in the horizontal and vertical directions, and converts it so that it fills the TV screen in the HDTV system in the vertical direction, or complements the TV screen in the horizontal and vertical directions by about 3 times. It is enlarged and converted so that it fills the HDTV TV screen horizontally.

[0004]

However, as described above, when the NTSC system TV screen is complemented and enlarged twice in the horizontal and vertical directions, respectively, the spectrum ratio is 16: 9.
The wide screen cannot be used effectively because there is an empty space to the left and right of the screen.

Also, about 3 in each of the horizontal and vertical directions.
When the image is complemented and enlarged twice, as shown in FIG. 2, a total of about 25% is cut in the upper and lower parts (hatched parts), so for example, the super character inserted in the lower part of the screen is displayed on the screen. There is a problem that you cannot do it. In particular, super characters are very important information for viewers because the player names, scores, etc. are displayed in live broadcast programs such as car races and baseballs.

An object of the present invention is to display an NTSC type TV screen on the lower side (or upper side) of the screen when complementing and enlarging the screen in the horizontal and vertical directions by about 3 times and converting it to fill the horizontal direction. It is an object of the present invention to provide a TV system converter that converts an inserted super character so that it can be displayed on the screen.

[0007]

A TV system converter according to the present invention comprises an image memory for storing an NTSC TV signal as image data, and a memory control section for controlling reading of the image data stored in the image memory. Equipped with and NTSC
In the TV system converter for complementing and enlarging the TV screen of the HTS system in the horizontal and vertical directions so as to fill the horizontal direction of the TV screen of the HDTV system,
A character detection unit which receives a TV signal of the system and detects whether or not a super character is inserted in a predetermined range on the lower side or the upper side of the screen, and when the character detection unit detects the super character, A reading range designating unit for designating a reading range in the vertical direction of the image memory so that super characters can be displayed on the screen; and the memory control unit, the reading range in the vertical direction designated by the reading range designating unit. Of the image data is read from the image memory.

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The image memory unit 3 is a TV signal S of NTSC system.
1 is stored as image data. The memory control unit 4 converts the NTSC TV signal into an HDTV TV signal by controlling the reading of the image data stored in the image memory unit. In the present embodiment, as shown in FIG. 2, the NTSC TV screen is complemented and enlarged by about 3 times in the horizontal and vertical directions, respectively, and is converted so as to be filled in the horizontal direction.

The character detector 1 receives the NTSC TV signal S1 and detects whether or not a super character is inserted in the lower range (or upper range) of the screen designated by the range designation signal C1. Then, the detection signal C2 is transmitted. When the detection signal C2 indicates that a super character has been inserted, the read range designating section 2 generates a signal C3 indicating a vertical read range of image data according to the designation of the range designating signal C1.

In this case, the reading range designating unit 2 sets the reading range in the vertical direction so that the super character can be displayed on the screen. That is, the read position is moved only by the range including the super character, and the screen is shifted upward (or downward).

The memory control section 4 controls the reading of the image data in the vertical reading range indicated by the signal C3.

[0013]

As described above, according to the present invention, N
When a TSC TV screen is horizontally and vertically complemented and enlarged to be converted into an HDTV TV signal,
Detects whether or not a super character is inserted in a predetermined range below or above the NTSC TV screen, and when a super character is detected, shifts the screen up or down by the range including the super character. By controlling the reading of the image data in this way, it is possible to display the super character on the screen without cutting it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a TV screen size when the NTSC system is converted to the HDTV system.

[Explanation of symbols]

 1 character detection unit 2 read range designation unit 3 image memory unit 4 memory control unit S1 NTSC TV signal C1 range designation signal C2 detection signal C3 signal indicating vertical read range

Claims (1)

[Claims] 1. An NTSC TV signal is stored as image data in an image memory, and a memory control unit for controlling reading of the image data stored in the image memory is provided. In a TV system converter that complements and expands each direction to fill the horizontal direction of an HDTV system TV screen, the NTSC system TV signal is received, and the TV screen converter is placed within a predetermined range below or above the screen. The character detection unit that detects whether or not a super character is inserted, and the vertical read range of the image memory is set so that the super character can be displayed on the screen when the character detection unit detects the super character. And a reading range designating unit for designating, wherein the memory control unit is configured to display an image of the reading range in the vertical direction designated by the reading range designating unit. A TV system converter characterized in that data is read from the image memory.