JPH0730811A - Character generator for high-definition television - Google Patents

Abstract

PURPOSE:To display a character and a symbol or the like selected from many stored fonts at a desired position in a desired color by providing a video RAM storing a display character or a kind of a symbol and color data and a ROM or the like storing pattern data of display character or the like so as to connect them to a MUSE LSI chip set. CONSTITUTION:A character generator 2 receives a required signal 3 comprising clock signal synchronously with an input video signal, a frame signal synchronously with a frame of the video signal and a horizontal synchronizing signal of the video signal and control data 5 representing a kind of a character to be displayed, a display position on a screen and a character color from a MUSE decoder section 1. The control data 5 are stored tentatively in a video RAM. Then pattern data stored in a ROM are read in matching with high-definition television display timing and the generator 2 generates a display output signal 4 comprising R, G, B signals such as display character and a luminance level control signal to output to the MUSE decode section 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is for displaying various kinds of on-screen characters on a high-definition screen by MUSE L.
The present invention relates to a high-definition character generator used by connecting to an SI chip set.

[0002]

2. Description of the Related Art Conventionally, a MUSE high-definition receiver LSI (MUSE LSI chip set: MB8)
6110-MB86115; manufactured by Fujitsu, etc.) did not have a function of superimposing and displaying volume, time, etc. on a high-definition screen, that is, a so-called on-screen function. Therefore, there is a method of connecting a character display LSI commercially available as a character generator via a required interface and using it. However, in that case, you will have to select from the available LSI for character display, and
There is a problem that the display performance is insufficient, such as the number of characters that can be displayed is small, depending on the specifications of I.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is connected to a MUSE LSI chip set and a desired character, symbol, etc. selected from a large number of stored character types, It is an object to provide a high-definition character generator that can be displayed in color.

[0004]

In order to achieve the above object, a clock signal, a horizontal synchronizing signal, and a frame pulse signal are input, and a screen display position is previously set at a required timing according to the supplied control data. An address generator for outputting address data of the corresponding video RAM, and a type of display character or a type of symbol (address data of ROM) are stored for each address data of the video RAM output by the address generator, and color data is stored. A video RAM for storing the pattern data, a ROM for storing the pattern data such as the display character, a parallel / serial converter for converting the pattern data read in parallel from the ROM into serial data by a display clock signal, / The serial data output from the direct conversion unit and the color data are input to display the R, G, B signals of display characters and the brightness level control. Made of a synthetic unit to produce a signal.

[0005]

With the above configuration, the clock signal synchronized with the video signal, the frame signal synchronized with the frame of the video signal, and the horizontal synchronization signal of the video signal are input, and the type of characters to be displayed and the display on the screen are also displayed. Predetermined data representing the position and the color of the characters are temporarily stored, and the stored pattern data is read in time with the display timing of high-definition, and the R, G, B signals and the brightness level control signal of the displayed characters are read. Generate and output.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-definition character generator according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual block diagram of an embodiment for realizing a high-definition character generator according to the present invention. 1 inputs the detection output of the BS tuner for connecting the high-definition character generator according to the present invention, and TCI (Time Compress)
This is a MUSE decoder unit configured by a MUSE LSI chip set that extracts a video signal, a synchronizing signal and an audio signal from a dIntegration type MUSE signal and outputs them to a display device. Reference numeral 2 denotes a high-definition character generator according to the present invention, which is a required signal 3 composed of a clock signal synchronized with the input video signal from the MUSE decoder unit 1, a frame signal synchronized with a frame of the video signal, and a horizontal synchronization signal of the video signal. And control data 5 consisting of the type of characters to be displayed, the display position on the screen, and the color of the characters
On the basis of the stored pattern data to generate a display output signal 4 consisting of R, G, B signals such as display characters and a brightness level control signal, and the MUSE decoder unit 1
Output to.

FIG. 2 shows an embodiment of an on-screen display screen by the function of the high-definition character generator according to the present invention. Reference numeral 10 is a display screen for displaying a high-definition image, and characters and symbols are displayed on-screen in a desired color in a desired position designated in advance.

FIG. 3 is a circuit block diagram of an embodiment of a high-definition character generator according to the present invention. The reference numeral 20 inputs a clock signal, a horizontal synchronizing signal, and a frame pulse signal which are synchronized with the input video signal, and previously outputs the address data of the video RAM corresponding to the display position of the screen at a required timing according to the supplied control data. This is an address generation unit for outputting. Reference numeral 22 is a video RAM that stores the type of display character or the type of symbol (address data of ROM) for each address data of the video RAM output from the address generator 20, and also stores color data.
Reference numeral 23 is a ROM that stores the font data of the display characters and pattern data such as symbols. Reference numeral 24 denotes pattern data read in parallel from the ROM 23,
It is a parallel / serial converter that converts serial data using a display clock signal. Reference numeral 25 denotes R, G, and R of display characters by inputting the serial data output by the parallel / serial converter 24 and the color data.
It is a combining unit that generates a B signal and a brightness level control signal (L). The address generator 20 inputs a clock signal synchronized with a video signal, a frame signal synchronized with a frame of the video signal, and a horizontal synchronization signal of the video signal. Also,
In advance, the display position of a desired character on the screen is temporarily stored as control data. The video RAM 22 temporarily stores the type of characters to be displayed (ROM address data) and the color of the characters as control data. The address generator 20 causes the video RAM 22 to match the display timing.
And the required dot data are output in parallel from the ROM 23 based on the read data. If the access address of the address generator 20 is expanded to, for example, 2 bytes and the horizontal address is represented by the number of dots that can be displayed in high-definition, one character is represented by 8 dots vertically and horizontally.
The horizontal direction of the video RAM may be arranged from address 1 to 128, and the vertical address may be arranged from address 1 to 128. Further, when the display characters are displayed in vertical and horizontal 32 dots, the horizontal and vertical addresses may be discretely instructed by the integer 4 (32/8) and displayed on the screen. Further, ROM address data consisting of a 2-byte code is stored for each address of the video RAM, and a capacity of 64K words (approximately 6,000 kinds of characters) corresponding to the 2-byte ROM address (2 16th power) is provided. It is also possible to use a ROM and increase the types of characters to be displayed so as to include most of the JIS first level and JIS second level.

[0009]

As described above, the present invention is based on MUSE.
Provided is a high-definition character generator which is connected to an LSI chip set and can display characters and symbols selected from a large number of stored character types in desired positions and colors. Therefore, unlike the related art, the performance of the selected character display LSI is not limited, and there is an advantage that on-screen characters and the like can be finely displayed on the high-definition screen. Further, since the clock signal synchronized with the supplied video signal is used, no PLL circuit is required, which is also useful for cost reduction.

[Brief description of drawings]

FIG. 1 is a conceptual block diagram of an embodiment for realizing a high-definition character generator according to the present invention.

FIG. 2 is an example of an on-screen display screen operated by a high-definition character generator according to the present invention.

FIG. 3 is a circuit block diagram of an embodiment of a high-definition character generator according to the present invention.

[Explanation of symbols]

 1 MUSE decoder unit 2 Hi-vision character generator 3 Required signal 4 Display output signal 5 Control data 10 Display screen 11 On-screen display 20 Address generation unit 22 Video RAM 23 ROM 24 Parallel / Direct conversion unit 25 Compositing unit

Claims (4)

[Claims] 1. An address generator for inputting a clock signal, a horizontal synchronizing signal, and a frame pulse signal, and outputting address data of a video RAM corresponding to a display position on a screen in advance at a required timing according to supplied control data. And the type of display character or the type of symbol (R
RAM address data) and color data, a video RAM for storing color data, a ROM for storing pattern data such as the display characters, and pattern data read in parallel from the ROM for serial data using a display clock signal. And a serial / serial conversion unit for converting the serial data output by the parallel / serial conversion unit and the color data into the display character R,
A high-definition character generator comprising: a synthesizing unit for generating G, B signals and a brightness level control signal. 2. The addresses of the video RAM are horizontally 1 to m, and vertically vertically from 1 to n.
The high-definition character generator according to claim 1, wherein an address is formed in the address. 3. The high-definition character generator according to claim 2, wherein the address of the video RAM is specified by a predetermined integer value. 4. The high-definition character generator according to claim 1, wherein 2 bytes of data are stored for each address of said video RAM, and a ROM having a required capacity designated by said 2 bytes of data is used.