JPH04146568A - Cd-i system - Google Patents

Abstract

PURPOSE:To effectively use an internal RAM by storing the character font data corresponding to the character code data used by a CD-I disk into this disk and storing these data into an internal memory of a player. CONSTITUTION:The character font data corresponding to the character code data used by a CD-I disk 12 are stored in the disk 12, and these data are stored in an internal memory 27 of a CD-I player. That is, the necessary character font data to be stored in the memory 27 of the CD-I player are minimized. Thus the memory area of the memory 27 is effectively used for storage of data needed for other processing purposes. For instance, more picture data can be stored in the memory 27.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention is directed to an internal memory (RAM) of a CD-1 player that stores character font data held by a CD-1 disc.
) relates to a CD-I system which uses the minimum necessary memory area for storing character font data and allows the remaining memory area to be used for storing data for other processing.

<Prior art> Generally, in a CD-I system, a CD-I disc holds sound data and image data, and these data are transferred to a CD-I disc.
The D-I player is reading and processing it. That is,
After these data are temporarily stored in the internal memory of the CD-I player, the sound data is output as audio from the sound system via the audio processor and tone generator, while the image data is output as audio from the sound system through the image processing processor and the R
The image is displayed on a CRT via a GB signal generator. In this case, specific characters among the characters displayed in the image of the CRT are formed based on character font data held within the CD-I player.

That is, as for image data (including character font data), for example, the CPU of a CD-I player reads it from each sector of the real-time file area (RTF) of a CD-1 disc via a buffer and stores it in an internal register. After that, it is transferred to RAM (internal memory). The VDP displays the stored data of RA and M on the CRTE via an RGB signal generator.

On the other hand, sound data is similarly read out from each sector of the real-time area by the CPU. An audio processor processes this sound data and generates sound from the sound system at a constant rate via a tone generator.

By the way, since the CD-I system does not have a kanji ROM for storing character font data other than the specific characters mentioned above, the character font data is stored in the CI)-T disk and stored in the internal RAM of the CD-I player. , this C
Character font data is being read from the DT disk.

However, in order to ensure compatibility with other manufacturers, the CD-T system's internal RAM capacity is limited to, for example, IMB.
It is stipulated that

In this case, when designing a CD-1 disc that handles Japanese, character font data such as JIs 1st level,
Approximately 6. ooo characters had to be retained in the CD-I disc.

Then, the CD-I player transfers all of these character font data from the CD-I disc to its internal R.
It was loading on AM. In addition, the character font data stored in the RAM by the corresponding character code was read out and displayed on the CRT screen. That is, in the conventional CD-r system, even character font data that is unnecessary for screen display is temporarily stored in the internal memory.

As a result, the capacity occupied by the internal RAb1 for these 6,000 characters of character font data is approximately 400 KB in the case of 24 x 24 dot characters. In conventional CD-I systems, character font data that is not used to display characters in images actually occupies a large proportion of the CD-I player's internal RAM, compressing the limited memory space and There was a problem in that the RAM could not be used effectively.

For example, it is desirable to store as much image data other than character font data as possible on the internal RAM.

This is to enable more images to be expressed on the CRT.

Furthermore, when attempting to use the RAM for other processing, there is a problem in that the memory cannot be used or the processing is limited.

This has been a major drawback when using character font data and performing other processing in the CD-I system.

Therefore, the present invention aims to provide a CD-I system that minimizes the amount of character font data stored in memory and allows this memory to be used for other processes. That is the purpose.

Means for Solving the Problems> The CD-T system according to the present invention temporarily stores data held on a CD-1 disc in the internal memory of a CD-I player, and displays images based on this stored data. At the same time, in a CD-I system that generates audio, the CD-I disc stores, in addition to image data and audio data, character font data corresponding to character code data used in this CD-I disc. This is a CDi system that stores these data in the internal memory.

Further, in the CD-J system according to the present invention, the CD-J system described above
The I disk holds character font data for each playback unit of a song or the like.

Effect> In the CD-I system according to the present invention, by keeping the amount of character font data stored in the internal memory of the CD-I player to the minimum necessary amount, the memory area of the internal memory is freed up for other processing. It can be effectively used for data storage. For example, more image data can be stored in the internal memory.

For example, when producing a CD-I disc, only character font data necessary for reproduction of the CD-I disc is selected from a character font database and stored. As a result, when playing back on a CD-I player, there is no unnecessary character font data loaded from the CD-1 disc into the internal memory for playback, and the overall memory capacity occupied by the character font data is reduced. Therefore, the memory area of the internal memory can be used effectively.

On a CD-I disc, for example, necessary character font data for each music piece may be stored in a corresponding area, and when the music piece is played back, the character font data may be selected and loaded into the internal RAM.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are diagrams for explaining an embodiment of the CD-1 system according to the present invention. This example is for the CD
This is an example of using the -I system as a CD-I masterpiece album. Other examples of uses include encyclopedias, reading books, etc.

In FIG. 1, reference numeral 11 indicates a CD-1 player, and reference numeral 12 indicates a CD-1 disc driven by the CD-1 player 11. Further, 13 is a keyboard which is an input device for data, commands, etc. to the CD-I player 11, 14 is a display which is a data output device from the CD-1 player 11, and 15 is a speaker etc. which is also an audio output device. Each shows a sound system consisting of:

This CD-I player 11 has the following configuration.

That is, 1. CPU 21, keyboard interface 22, CD interface 23, tone generator 24, RGB signal generator 25, and ROM 26
, RAM (internal memory) 27, and video processor 2
8, and these are connected to each other by a pass line.

The CPU 21 uses, for example, a 68000 series processor because it is necessary to perform real-time processing.

The keyboard interface (Ilo) 22 outputs external input from, for example, the keyboard (KBD) 13 to the CPU 21.

The CD interface 23 includes a disc driver and the like, and is an interface between the CD-1 player 1 and the CD-I disc 12.

The tone generator 24 supplies a predetermined sound generation signal to the sound system 15 based on the sound data stored in the RAM 27. The sound system 15 includes, for example, an amplifier and a speaker.

The ROM 26 stores programs such as the CPU 21 (7) O3.

The RAM 27 constitutes a working memory area for the CPU 21 and has a capacity of, for example, IMB.

The RAM 27 stores character font data, natural image data, sound data, etc.

A video processor (VDP) 28 exchanges signals with the CPU 21 and controls this RAM 27 to store, for example, character font data (font pattern), delta YU
The V data (natural image data) is output to the RGB signal generator 25 to compose a desired image on the display (CRT) 14.

Further, the CD-1 disc 12 has one track designed in a spiral shape based on the CD-1 standard. That is, on the CD-I disc 12, a large number of pits are arranged in a spiral shape as one track. Therefore, this CD-I disc 12
The data is spiraled from the inside to the outside in the radial direction (as a digital signal depending on the presence or absence of bits).
recorded.

This track is scanned by a CD-I player 11 (optical pickup) having a two-track configuration.

A disc label area and a user area (data area) are defined on the track based on the CD-I standard. This data area is made up of a large number of consecutive sectors.

The disc label area is made up of file tables and the like. For example, the start addresses of multiple files are recorded.

In addition, the data area is a real-time file (RTF).
This area contains character code data for displaying characters on multiple sides (song lyrics, composer name, etc.), color code data for the characters, and background image data for multiple sides (
A still image (for example, a DYUV image) as a background of lyrics and a series of sound data (sound data for music) are stored in each sector. The l sector stores either sound data, image data, or computer data.

This CD-I disc 12 stores a plurality of songs, and each side is composed of a plurality of still image screens.

The character code data for displaying the shape of the character and the color code data for displaying the color of the character stored in the real-time file area are read out by the CPU 21 and transferred to the RAM 27. . The character code data is for creating a character image on the CRT 14 using, for example, character font data (bitmap data).

The sound data and background image data stored in the real-time file area are stored in C as a real-time file.
It is processed in real time by the PU21. The sound data is transferred to tone generator 24. Background image de-
- The data is transferred to the RAM 27.

FIG. 2 shows an apparatus configuration for editing necessary character font data on this CD-I disc 12. As shown in FIG.

As shown in this figure, a computer 31 uses a magnetic disk 33 as a font database based on data from a magnetic tape 32 (which may also be a floppy disk).
Desired character font data is read from the font and stored in the hard disk 34.

Also, by a separate process. Image data and sound data are also stored in this hard disk 34, and these data are recorded on a CD-ROM.
A CD-I disc is created by processing the data into a data format that can be recorded onto a CD-I disc.

The database 33 stores, for example, character font data of approximately 6,000 characters or more of JIS 1st level and 2nd level, such as 32 dots x 32F, 24 dots x 24
This is held as dot bitmap data.

For example, 500 characters of character font data to be used in the CD-I data 2 are read out from this database 33, a conversion table between the JIS code and the dedicated code for storage is created, and these are converted into the CD-1 disc data. CD-I along with other natural image data and sound data.
It is stored on the disk 12.

FIGS. 3(B) to 3(C) show the data structure of the CD-r disc 12 in which data is stored in this manner.

FIG. 3A shows a conventional CD-I disc in which 6,000 characters of character font data have been read.

FIG. 4(A) shows the structure of the memory area when all approximately 6,000 characters are read into the RAM 27, as in the conventional case.

Figure 3 (B) shows character font data, for example, on the CD.
This shows the case where only the amount necessary for reproduction on the -1 disk 12 is stored. As shown in this figure, CD-I disc 1
2, first the character font data is stored in, for example, RTF, and then the sound data and image data of songs A, B, . . . are stored in that order. Then, the data is loaded as is from this CD-r disc 12 into the RAM 27. FIG. 4(B) shows the RAM area when loaded.

Figure 3 (C) shows character font data F (A), F
(B), . . . are stored in sectors consecutively with the sound data, image data, etc. for each song.

In this way, as shown in Fig. 4 (CI) and Fig. 4 (C2), each of the songs A and B can be loaded into the RAM 27, and the remaining RAM area can be used more effectively. I can do it.

These Figures 4 (A), (B), (CI),
Each figure (C2) shows the memory area configuration of the RAM 27 when character font data is stored.

In these figures, 27-1 is a storage area for character font data, 27-2 is a storage area for other image data (natural image data) and sound data, and 27-3 is a storage area for character code data. ing.

FIG. 5 shows a schematic flowchart when font data for 120 characters of a CD-I disc is temporarily stored in the RAM 27 and displayed on the monitor 14 as characters in an image.

First, an application program is read from the CD-I disk 12 into the memory RAM 27 (step 551).
). Then, run this application program.

Next, character font data is read from the CD-r disc 12 and loaded into a predetermined area 27-1 of the RAM 27 (S52).

Furthermore, other image data and sound data are also stored in the RAM area 27-2, and character code data is also stored in the RAM area 27-3.
Load each into In this case, the character code data is converted into a special code when character font data is read into the CD-I disc 12.

For example, character font data expressed in JTS coat,
When storing this in the RAM 27, the RAM area 27
-1 is stored sequentially. Therefore, it is not possible to search using the JIS code. In order to make this searchable, a conversion code is added.

Next, during RTF playback, this character code is read at the same time as sound data and natural image data are played back (S53
).

Then, check whether the characters are displayed (554), and if so, display them on the monitor 14 (S55).

The above is a general flowchart.

In this case, if the CD-1 disc 12 holds separate character font data for each song as shown in FIG. 3(C), the song selection is performed after step S52. .

Note that operations such as creating a draw map in the memory 27 to store natural image data are performed by the CPU 21. Furthermore, RTF by CPU21
The playback of the music is started by the play.

For example, data is read sector by sector from RTF and checked for sound data. If it is sound data, it is transferred to the tone generator 24 and the music is played back from the sound system 15.

If the data read from the RTF is image data, for example, a draw map or the like is created in the memory area, and a read image is constructed from this map on the display 14 as a frame for one screen.

Note that, as shown in the above embodiment, in order to effectively use character font data, when only necessary character font data is stored, by creating a conversion table,
It is possible to search for character font data by inputting a JIS code. This conversion table can be placed, for example, immediately before the character font data shown in FIGS. 3(A) to <C> on the CD-■ disc 12.

In addition, if character font data is read for each song during playback, Figure 3 (C) and Figure 4 (C
1) As shown in FIG. 4 (C2), it takes a short amount of time to rewrite the RAM 27. However, this time is extremely small and does not cause any problem in playing music or the like. In this case, the more songs are stored, the more effectively the memory area can be used. For example, it is possible to increase the number of screens stored in the memory area and to shorten processing time.

<Effects> As explained above, according to the present invention, since the minimum character font data required for playback is stored in the internal memory of the CD-I player, this data is not used for other data processing such as image processing. You can allocate more memory area. That is, limited memory space can be used effectively. In addition, playback from a CD-I disc can be speeded up as a whole. In addition, by creating a character code conversion table, standard JI
It is also possible to search using codes such as S.

[Brief explanation of the drawing]

FIG. 2 is a block diagram showing a schematic configuration of a CD-1 system according to an embodiment of the present invention, and FIG. FIG. 3(A) is a conceptual diagram showing the B-frequently configured configuration for storing data. FIG. 3(A) is a diagram showing an outline of the data structure of a conventional CD-I disc. FIG. FIG. 4 (A) is a diagram showing an outline of the data structure of a CD-I disc according to an embodiment, and FIG.
AM memory map, Figure 4 (B), (CI)
, (C2) are memory maps of the RAM of the CD-I player according to one embodiment, and FIG. 5 is a flowchart showing a general procedure up to character display in the CD-1 system according to one embodiment. 11 ・ 12 ・ 14 ・ 15 ・ 21 ・ ・CD-I player, ・CD-I disk, ・Display, ・Sound system, ・CPU, 23...CD interface, 24...
...Tone generator, 25...
RGB signal generator, 26...ROM
, 27......RAM (internal memory), 28φ・
SankenφφfightφVDP. 33...Magnetic disk device (character font database), 27-1...Character font data area. Patent applicant: Toppan Printing Co., Ltd. Representative Patent attorney Kiyoshi Kuwai - Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) Transfer the data stored on the CD-I disc to the CD-I disc.
A CD that is temporarily stored in the player's internal memory and displays images and generates audio based on this stored data.
In the -I system, the CD-I disc stores, in addition to image data and audio data, character font data corresponding to character code data used in the CD-I disc, and these data are stored in the internal memory. A CD-I system characterized by storing data in a CD-I system. (2) The CD-I disc according to claim 1, wherein the CD-I disc retains character font data for each playback unit of a song or the like.
system.