KR940007815B1 - On-screen displaying method on cdp - Google Patents

Abstract

The on-screen displaying method includes the steps of storing data stored in a font data memory in a spare memory of a video RAM through a compact disk graphic processor by the control of a microprocessor, and displaying information on music which is being played from the compact disk player on an on-screen display (OSD) region of a TV screen by accessing an address of the OSD region when an OSD signal is received, thereby providing convenience to the user.

Description

How to implement on-screen display in compact disc player with graphics function

1 is a block diagram for implementing an on-screen display in a CDP with graphics capabilities according to the present invention.

2 is a diagram showing a screen state of a TV according to the present invention.

3 is a diagram showing the font configuration of the on-screen display area of FIG.

4 is a diagram showing an embodiment displayed by the on-screen display function according to the present invention.

5 illustrates on-screen display font data according to the present invention.

6 is a diagram showing an example of a pointer configuration for an on-screen display according to the present invention.

* Explanation of symbols for main parts of the drawings

1: key input 2: micom

3: font data memory 4: CD graphics processor

5: video RAM 11: TV screen

12: CD graphic screen area 13: On screen display area

The present invention relates to a compact disk player (hereinafter referred to as a CDP) which is connected to a television (hereinafter referred to as a TV) and performs a graphic function on a TV screen. The present invention relates to a method for implementing an on-screen display in a CDP having a graphic function for displaying information as an on-screen display (OSD) function on a TV screen.

CDP with CD graphic function is capable of video accompaniment, moving picture function and audiovisual function as graphic screen by connecting CDP and TV as well as CDP function. The display device attached to CDP allows song number and We display progress time of song. However, this has a meaning when the user directly operates in close proximity to the CDP, and when the user operates the CDP with the remote control at a certain distance, the user visually checks the contents displayed on the display device attached to the CDP. Things had a difficult problem virtually. In general, a CDP having a CD graphics function has a video corresponding to a TV screen. The size of the video RAM required for the CD graphic format is calculated as follows.

TV screen = 50 width x 18 fonts = 900 fonts (1)

1 font = 6 pixels wide x 12 pixels high = 72 pixels high ..... (2)

In addition, since 16 colors can be displayed at the same time, it requires 4 bits of memory per pixel. Therefore, the size of the total required video RAM is multiplied by equation (1) and equation (2) and multiplied by the number of color bits per pixel as follows.

900 fonts x 7 pixels x 4 bits = 64,800 x 4 bits ... (3)

However, since 64,800 × 4bit of RAM is not produced, 64K × 4BIT (65,536 × 4bit) of RAM is used. In this case, when calculating the area of the RAM that is not used in the CD graphic,

(65,536 × 4bit)-(64,800 × 4bit) = 736 × 4bit ......... (4)

The area of video RAM remains. If you use this area as the memory required for the OSD,

(736 × 4bit) ÷ (6 pixels wide x 12 pixels high) = 40.89 fonts ......... (5)

Becomes That is, it can be used as memory corresponding to 40 fonts.

Accordingly, an object of the present invention is to provide an OSD implementation method in a CDP having a graphics function that is convenient for a user by displaying information about a song on a TV screen using an OSD function of video RAM required for a CD graphic. I would like to.

Features of the present invention for achieving this object, an input unit consisting of a key panel and a remote control, a microcomputer to control the CDP according to the input signal connected to the input unit, bidirectionally connected to the micom information about the song A font data memory for storing font data for display, a CD graphics processor connected to the micom to display image data recorded on the CD on a TV screen under the control of the microcomputer, and a CD connected bidirectionally to the CD graphics processor. The video processor is configured to store data corresponding to a TV screen under the control of a graphics processor to simultaneously perform video and audio recorded on a compact disc, and to display information about songs on a display device attached to the compact disc player. When the power is on, in the control of the microcomputer The data stored in the font data memory is stored in the spare memory of the video RAM through the CD graphics processor.When the OSD on signal is input from the input unit, the address of the OSD area is accessed by the printer format under the control of the microcomputer and the CD graphics processor. There is a method for implementing an on-screen display in a CDP having a graphic function, characterized by displaying information about the music in progress in the CDP in the OSD area of the TV screen.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to the present invention, an input unit 1 consisting of a key panel and a remote controller, a microcomputer 1 for controlling the entire system according to a signal inputted by the input unit 1 connected to an output side, and A font data memory (3) which is connected bidirectionally to the microcomputer (2) and stores font data for indicating information on the song; and displays the video data recorded on the CD screen on the TV screen under the control of the microcomputer; A CD graphics processor 4 displaying information about songs in an OSD region of a TV screen, and data corresponding to one screen of the TV and data to be displayed in the OSD region of the TV under the control of the CD graphics processor 4. It consists of a video RAM (5) for storing the.

2 shows a TV screen according to the embodiment of FIG. 1, where 11 is a TV screen, 12 is a CD graphics screen area, and 13 is an OSD area.

FIG. 3 shows a configuration example of a font in which information about a song is displayed according to an embodiment of the present invention, and the information to be displayed in the OSD area 3 of FIG. 2 fonts of the song number, 33 is a separator, 34, 35 is the running time "minutes", 36 is a separator, 37, 38 is composed of the running time "seconds".

4 shows an example of FIG. 3, and FIG. 5 shows font data necessary for displaying information about a song according to the present invention.

6 shows a register inside the CD graphics processor according to the present invention, which is stored as an offset pointer of the font data to be displayed at the corresponding position of FIG.

According to the present invention configured as described above, when the power of the CD graphic built-in CDP is turned on, data corresponding to the font to be used in the OSD is sequentially transmitted from the microcomputer 2 of the CDP to the CD graphics processor 4. At this time, the font data may be held in the memory inside the microcomputer 2 or may be used in the external font data memory 3 depending on the number of fonts.

On the other hand, the CD graphic processor 4 sequentially stores the transferred font data in the OSD data area (extra memory area not used for CD graphics) of the video RAM 5. After this process, the microcomputer 2 transmits the information corresponding to the OSD area, that is, the information (song number, duration, remaining time, etc.) about the music being processed in the CDP. Then, the CD graphics processor 4 Store this information internally. Then, the microcomputer 2 receives an OSD on / off signal which can be operated as a key panel or a remote controller, and transmits a command corresponding to the OSD on / off to the CD graphics processor 4.

The CD graphics processor 4 performs a normal operation in the case of the OSD off, and performs the following operation in the process of displaying the data of the video RAM (5) in the case of the OSD off. That is, by accessing only the address of the OSD area without accessing the address of the CD graphic area and displaying the corresponding font data of the OSD data area according to the OSD information stored therein, the information necessary for the TV screen is turned on / off as the OSD. Therefore, referring to the embodiments illustrated in FIGS. 3 to 6, the CDP displays the song number and the duration of the song being reproduced by the OSD function in the reproducing operation. same.

In FIGS. 3 and 4, 2 fonts of 31 and 32 are song numbers, 33 is a separator, 2 fonts of 34 and 35 are running times "minutes", 36 are separators, and 37 and 38 are running times "seconds". As it is displayed, the number of the currently displayed song is 2 and the running time is 2 minutes and 46 seconds. Accordingly, the font data necessary for displaying the information of the song is shown in Fig. 5 as the numbers " 0 to 9 " and the separator ": ". Here, since the data for the blank is meaningless, 11 font data are required.

Therefore, the memory capacity required for 11 fonts is as follows.

11 fonts X 6 pixels in width X 12 pixels in height = 99 * 8bit ... (6)

In other words, a total data area of 99 bytes is required. At this time, the font data of about 99 bytes can be stored in the microcomputer 2, and the font data memory 3 may be used. In the equation (5), the font that can be used for the free memory of the video RAM is 40 fonts, so the free memory capacity of the video RAM is sufficient.

At this time, the information for display as the OSD is stored as an offset pointer of the font data to be displayed in the corresponding position of FIG. 3 by configuring the register inside the CD graphics processor as shown in FIG. Therefore, if the song number currently in progress is 2 and the duration of time 2 minutes and 46 seconds has elapsed, the same data as the fourth degree is displayed in the OSD area 13 of FIG.

At this time, the register inside the CD graphics processor 4 stores, as a pointer, information on how far the font is from the base address of the OSD area of the video RAM as shown in FIG. Then, the microcomputer 2 delivers only the change of the information to the CD graphics processor 4 as the song progresses, and the CD graphics processor 4 plays the OSD on the TV screen while playing the video data of the CD. After indexing the OSD base address multiplied by the font size of the pointer of FIG. 6 at the position of the OSD region 13 of FIG. 2, the font data is addressed and displayed on the OSD region 13 of the TV screen.

As described above, the present invention is intended to view information about songs by remotely operating the remote control by displaying information on the music being processed in the CDP functioning as a CD graphic function as an OSD function on a TV screen using an extra memory of a video RAM. There is an effect that gives convenience to the user.

Claims (1)

An input unit 1 consisting of a key panel and a remote controller, a micom 2 for controlling a compact disc player according to a signal input and connected to the input unit 1, and a bidirectional connection to the micom 2 for a song A font data memory (3) for storing font data for representing information, and a CD graphics processor (4) connected to the microcomputer (2) for displaying image data recorded on a CD on a TV screen under the control of the microcomputer (4); And a video RAM 5 connected bidirectionally to the CD graphic processor 4 to store data corresponding to a TV screen under the control of the CD graphic processor 4, and the video and audio recorded on a compact disc. A method of simultaneously performing the operation and displaying information about a song on a display device attached to a compact disc player, the control of the microcomputer 2 when the power is turned on. The data stored in the font data memory (3) is stored in the spare memory of the audio RAM (5) via the CD graphics processor (4). When the OSD on signal is input from the input unit (1), the microcomputer (2) and the CD are stored. On-screen in the CDP having a graphics function, characterized by accessing the address of the OSD area in the form of a pointer under the control of the graphics processor 4 to display information on the music being processed in the CDP in the OSD area of the TV screen. Display implementation.