JPH04345962A - Disk reproduction device - Google Patents

Abstract

PURPOSE:To obtain a CD-I player being able to reproduce a disk for a data disk man by reading out classification discrimination information in an optical disk at a reproduction start time, and automatically switching a data reproduction processing operation and an audio signal or a reproduction processing operation of picture information, corresponding to the classification discrimination information. CONSTITUTION:At a reproduction start time, a TOC in an inner periphery of the optical disk 15 is accessed 1 and discriminates whether it is a CD-ROM disk or not, by detecting whether a subheader is present or not. If it is the CD-ROM disk, operation keys of PLY,AMS,ST0P, etc., to operate the CD-ROM are displayed on a LCD display 13 and also a ROM 44 for font is connected to a bus 33 and the reproduction is conducted by operating an X-Y device 11 and trigger buttons 10A, 10B. On the other hand, if it is the CD-I disk, a system ROM 36 is used and with a similar operation the reproduction is performed. Hence the reproductions of the CD-ROM disk and CD-I disk are automatically available.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus suitable for use in a so-called CD-I player for reproducing a CD-I disc on which image information and the like are recorded in addition to audio information.

0002

[Prior Art] In addition to audio data, a CD (compact disc) contains image data (natural images, animation,
A CD that records computer graphics, etc.), text data, program data, etc., and can be operated interactively.
-I (CD Interactive) system has been proposed. Since such a CD-I system has a playback function for text, images, audio, computer data, etc., it can be used for AV consumer equipment centered on audio/visual, education and entertainment centered on text, etc. It is expected to become a new form of media. CD-I
Various uses are defined for the system in order to maintain compatibility and make it widely available for home use. In other words, the CD-I system uses a 68000 series CPU (a 16-bit microprocessor developed by Motorola) and runs the widely popular OS9 as a real-time operating system that handles various files.
A system based on the above is used, and two output systems are available: audio and video. Also CD-I
The player is designed to be able to play ordinary compact discs for music. The structure of such a CD-I player consists of a player body into which a disc is loaded and played, a lid on the player body, a trigger button, an X-Y device, etc. arranged on the outside surface, and a control panel. It consists of an inner lid which serves as a control panel, and an outer lid which protects the inner lid and which serves as a control panel and has a display section, such as an LCD display, on its inner surface.

0003

[Problem to be Solved by the Invention] By the way, in the above-mentioned conventional CD-I player, an attempt was made to play back a disc for Data Discman on which character data used in a CD-ROM player, so-called Data Discman, was recorded. At the time, conventional CD-I players did not have character data and were virtually unable to reproduce the data. In view of this, it is an object of the present invention to provide a CD-I player that can automatically reproduce discs for Data Discman.

0004

[Means for Solving the Problems] The disc reproducing apparatus of the present invention is a disc reproducing apparatus for reproducing data recorded on an optical disc 15 as shown in FIGS. According to the type determination information, the data reproduction processing operation for reproducing character information and the reproduction processing operation for audio signals and/or image information are automatically switched.

[0005]

[Operation] According to the present invention, at the start of playback by a disc playback operation, the type determination information in the disc is read, and the data playback processing operation of reproducing character information according to this type determination information and the audio signal and/or image information In addition to automatically switching between the playback processing operation and the font R
Since OM44 is installed, CD-R for Data Discman
OM discs can also be played automatically.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the disc reproducing apparatus of the present invention will be described below with reference to the drawings. 3A and 3B are perspective views showing the overall configuration of an example of a CD-I player to which the present invention is applied. In FIGS. 3A and 3B, reference numeral 1 indicates the CD-I player according to this example as a whole. The CD-I player 1 according to this example has an integrated LCD display 13 so that it can be easily carried outside, and has been made smaller and lighter by integrating circuits and using chip components. It is being The overall size of this CD-I player 1 is, for example, 140 mm in width, 170 mm in length, and 60 mm in height.

[0007] Inside the housing of the player body 2 of the CD-I player 1, there is a disk drive section that rotates the mounted disk 15, a head drive section that moves the optical head in the radial direction of the disk, and an optical head. Contains a circuit board for signal processing of reproduced signals from. Furthermore, 680
It houses a computer consisting of a 00 series CPU.

[0008] On the front side 2A of the player body 2, there are a headphone jack 3, a volume control dial 4, and a power on/off switch.
An off switch 5 is provided. In addition, the player main body 2
An open button 6 is disposed on the front upper edge of.

An inner lid 7 is provided on the player main body 2 of the CD-I player 1 so as to be openable and closable. open button 6
When is pressed, the inner lid 7 is opened as shown in FIG. 3B. When the inner lid 7 is opened, the disc 15 can be loaded/taken out. The inner lid 7 is provided with a window 8. A transparent member is disposed in this window portion 8. Through this window 8, the rotational state of the mounted disk 15 can be confirmed. Further, on the front edge of the inner lid 7, a trigger button 10A, a trigger button 10B, and an X-Y device 1 are provided.
1 is arranged. The X-Y device 11 moves in the X direction and in the Y direction by pressing the portions that are deviated from the center up and down, left and right, respectively.
It is possible to specify the position in the direction.

[0010] As such an XY device 11, a pointing device such as a trackball, a mouse, or a joystick can be used. Inner lid 7
Further above, an outer cover 12 is provided so as to be openable and closable. This outer lid 12 can be opened by hand. This outer cover 12
can be opened to an opening/closing angle of 90 degrees or more, and can be fixed at a predetermined opening/closing angle θ. This outer lid 1
For example, there is a 4-inch LCD on the back side 12A of 2.
A display 13 is provided. When the outer cover 12 is opened, the LCD display 13 is exposed as shown in the figure.
The screen of the D display 13 can now be viewed. Further, on the back surface 12A of the outer lid 12, an LCD drive switch 14 is provided.
will be placed. By operating this LCD drive switch 14, ON/OFF of the LCD display 13 can be controlled.

In this example CD-I player, disc 15
CD-I disc, CD-ROM disc, CD
-I/CD-DA disk (CD-I disk and CD-
It is possible to play back CD-DA discs (discs mixed with DA discs) and CD-DA discs (compact discs for normal music playback). Here, the data format of CD-I will be explained.

[0012] CD-I records data in a format based on CD-ROM. The data recording unit is a block, similar to a CD-ROM. One block corresponds to 98 frames. The capacity of one block is 6 (
Number of audio data) x 2 (stereo 2 channels) x
2 (byte unit conversion) x 98 (number of frames) = 2352
It's a part-time job. The total recording capacity of a CD-I disc is 12 mm in diameter.
cm disk, it will be approximately 640 MB.

There are two types of CD-I data structures: Form 1 and Form 2. This corresponds to mode 1 and mode 2 of CD-ROM, respectively. In addition, CD-R
Mode 1 in OM adds an error detection code and an error correction code to one block of data to enable powerful error correction. Also, CD-
Mode 2 in the ROM allows for a large amount of user data without adding an error detection code or error correction code. In CD-I, Form 1 and Form 2 can be specified for each block, and Form 1 and Form 2 can be mixed on one disc.

The CD-I format differs from the CD-ROM format in that an 8-byte subheader is provided at the beginning of the user data. In this subheader, blocks in which audio, images, and data are recorded are time-division multiplexed in units of blocks. In order to process these in real time, necessary data is written in duplicate and stored. This subheader consists of four items: file number, channel number, submode, and data type.

That is, FIG. 4A shows the structure of Form 1. In form 1, sync (12 bytes) at the beginning
is provided, followed by a header (4 bytes) and further a subheader (8 bytes). After this, user data (2048 bytes) is provided,
In addition to this, error detection code EDC (4 bytes), P parity for error correction (172 bytes), Q parity (10
4 bytes) are added. Form 1 has improved error correction capability, and is suitable for handling data such as character data and program data in which errors cannot be interpolated.

FIG. 4B shows the structure of Form 2. In form 2, a sink (12 bytes) is provided at the beginning, followed by a header (4 bytes), and further a subheader (8 bytes). After this, user data (2324 bytes) and a reserve area (4 bytes) are provided. This form 2 is suitable for handling interpolable data such as audio data and video data. The subheader added to the beginning of user data includes the file number (2 bytes) and channel number (2 bytes), as shown in Figure 5.
It consists of , submode (2 bytes), and data type (2 bytes).

Four modes are determined for writing audio data on CD-I. One mode has a sampling frequency of 44.1 kHz and a quantization bit count of 16 bits, which is the same recording method as the current CD-DA. This mode is intended for ultra high-fidelity playback. In another mode, ADPCM (adaptive differential PCM) is used as the recording method. The sampling frequency is 37.8 kHz, and the number of quantization bits is 8 bits. In this mode, sound quality comparable to that of an LP record can be reproduced. Playback time is 2 hours in stereo and 4 hours in monaural. This mode is intended for high-fidelity playback.

In another mode, A is used as the recording method.
DPCM is used. The sampling frequency is 37.8
kHz, and the number of quantization bits is 4 bits. In this mode, sound quality comparable to FM broadcasting can be reproduced. Playback time is 4 hours in stereo and 8 hours in monaural. This mode is intended for long-term high-fidelity playback. In another mode, ADPCM is used as the recording method. The sampling frequency is 18.9 kHz, and the number of quantization bits is 4 bits. Playback time is 8 hours in stereo and 16 hours in monaural. This mode is intended for speech reproduction.

Image data is processed as follows depending on the type of image data. In the case of a natural image, the sampling frequency of the luminance signal Y is 7.6 MHz, the sampling frequency of the color difference signals U and V is 3.8 MHz, and they are sampled at a ratio of 4:2:2. and,
Each bit is compressed to 4 bits and recorded, and when played back, 8 bits are recorded.
It is considered a bit.

In the case of graphics, a CLUT (color lookup table) is used. CLUT graphics are 256 colors (8 bits), 128 colors (7 bits)
There are three modes: 16 colors (4 bits) and 16 colors (4 bits).
You can select and use the color you need from 16 million colors. In the case of animation, run-length codes are used. This compresses image data using color information and the length between pixels. You can use this code to create full-screen animations.

For CD-I discs, mechanical dimensions such as outer diameter, center hole dimension, and thickness, optical parameters such as refractive index and reflectance, disc rotation direction, recording linear velocity, track shape, track pitch, etc. All recording parameters, usage environment, etc. are normal compact discs for music (CD-D).
It is considered to be the same as A).

[0022] Then, whether or not it is a CD-I disc is determined by checking the TOC (Table
Of Contents). In other words, CD-I disc or CD-I/C
For D-DA disks, P when (POINT=A0)
SEC is set to 10. On the other hand, in other disks, PSEC is set to 00 when (POINT=A0). Therefore, PS when (POINT=A0)
From EC, CD-I disc or CD-I/CD-DA
You can determine whether it is a disc or another disc. And the CD
-The control field of (POINT=A0, A1, A2) of the I disk is set to (01×0). CD
The control field at (POINT=A0) of the -I/CD-DA disc is always set to (01x0), and the other control fields are set to (00x0). Therefore, from the control field, it is possible to determine whether the disc is a CD-I disc, a CD-I/CD-DA disc, or another disc.

[0023] CD-I includes audio data,
Since high-speed processing is required in real time, processing is performed using machine language. The CPU for this purpose is the 68000, a 16-bit CPU developed by Motorola.
system is specified. In addition, CDs that handle various files
- RTOS (Real Time Operating System) is based on OS9, and its programs are incorporated into the system in ROM. As input devices, at least two trigger buttons and an XY device are prepared. There are also two output systems: audio and video. A CD-I player is a C
D-DA can be played back.

FIG. 1 shows the configuration of a CD-I player 1 to which the present invention is applied. In FIG. 1, a disk 15 is rotated by a spindle motor 21 at CLV (constant linear velocity). The rotation of the spindle motor 21 is controlled by a spindle servo circuit 22 based on a clock reproduced by a CD reproduction circuit 28. Further, the output of the system controller 20 is supplied to the spindle servo circuit 22 .

The recording signal of the disk 15 is transmitted to the optical head 23.
is played. Optical head 23 is supported by a two-axis device. The output of the focus/tracking servo circuit 25 is supplied to this two-axis device. The output of the system controller 20 is supplied to the focus/tracking servo circuit 25 . A focus/tracking servo circuit 25 applies servo to the optical head 23 in two axes, the focusing direction and the tracking direction, based on the output of the photodetector.

Further, the optical head 23 is movable in the radial direction of the disk 15 by a slide feed mechanism 24 using, for example, a linear motor. This slide feeding mechanism 24 is controlled by a thread servo circuit 26. The thread servo circuit 26 includes a system controller 2.
An output of 0 is provided. This slide feed mechanism 24 allows the optical head 23 to access a desired track position.

The output of the optical head 23 is supplied to a CD reproducing circuit 28 via an RF amplifier 27. The CD reproducing circuit 28 includes bit clock reproducing circuit switching, EF
It consists of an M demodulation circuit, a CIRC error correction circuit, etc. In the CD playback circuit 28, the output of the optical head 23 is EFM.
Demodulated and error corrected. This CD playback circuit 2
8 is controlled by a system controller 20.

The output of the CD reproducing circuit 28 is supplied to a CD-ROM reproducing circuit 29. The CD-ROM playback circuit 29 includes a sync detection circuit, a descrambling circuit, an error correction circuit, and the like. A sync is detected by the CD reproducing circuit 28, and the scrambler is released. Then, the header address is checked and the target block is accessed. In the case of Form 1, error correction processing is further performed. This CD-ROM playback circuit 29 is controlled by a system controller 20. A command signal is given to the system controller 20 from an input device 30. The input device 30 has two trigger buttons 10A.
, 10B and an XY device 11.

31 is a CPU for controlling the CD-I system. For this CPU31, 68000
system is used. A master controller 32 is connected to the CPU 31 . Further, the CPU 31 and the system controller 20 are bidirectionally connected. C
A bus 33 is derived from the PU 31. In addition, CPU3
1 and the master controller 32 may be integrated into one chip.

The data reproduced by the CD-ROM reproduction circuit 29 is sent to the bus 33. A RAM 35A is connected to the bus 33 via video controllers 34A and 34B, respectively.
and 35B are connected. Further, a system ROM 36 and a backup nonvolatile RAM 37 are bidirectionally connected to the bus 33. Furthermore, in this example, this bus 33
A font ROM 44 is connected to. Also, bus 33
An audio decoder 38 is connected to.

Image data of the data reproduced by the CD-ROM reproduction circuit 29 is processed under the control of the CPU 31.
It is supplied to video controllers 34A and 34B. Video controllers 34A and 34B form a video signal based on this image data. This video signal is supplied to a video synthesizer 39. A video synthesizer 39 synthesizes the video signal from the video controller 34A and the video signal from the video controller 34B. The output of this video synthesizer 39 is L
The signal is supplied to the LCD display 13 via the CD drive circuit 40. The LCD display 13 is driven by the LCD
It can be turned on/off by the drive switch 14.

Audio data of the data reproduced by the CD-ROM reproduction circuit 29 is supplied to an audio decoder 38 under the control of the CPU 31. If the audio data is ADPCM, the audio decoder 38 decodes the ADPCM. The decoded audio data is supplied to the D/A converter 41 and converted into an analog signal. Then, the headphone output terminal 3 is connected via a low-pass filter 42 and an amplifier 43.
is output from. The audio signal level output from the headphone output terminal 3 can be set using the volume adjustment dial 4.

The operation of this example will be explained next. FIG. 2 shows the operation when the LCD display 13 is turned on. In FIG. 2, when the power is turned on using the power on/off switch 5 (FIG. 3), it is determined whether the calendar and internal clock are set (step 5).
1). If the calendar and internal clock are set,
-Y device 11 and trigger buttons 10A and 10B
The calendar and internal clock are set using (step 52). After the calendar and internal clock are set, it is determined whether a disc is installed (step 53).

If the calendar and internal clock are not set in step 51, the process goes to step 53, where it is determined whether a disk is installed. If the disc is not installed, a message indicating that the disc is not installed is displayed on the LCD display 13 (step 54). That is, when the disc is not installed, a display indicating that the display is not installed is displayed in the display area of the LCD display 13, and
A calendar and time are displayed in the display area.

[0035] The determination as to whether a disk is to be mounted continues (step 55). If it is detected in step 53 or step 55 that a disk is mounted, the TOC of the innermost circumference of the disk is accessed (
Step 56). Then, depending on the presence or absence of subheaders, C
It is determined whether the disk is a D-ROM disk (step 57).

If it is determined that the disc is a CD-ROM disc, a message indicating that a CD-ROM disc is installed is displayed on the LCD display 13 (step 5).
8). That is, when the CD-ROM display is installed, a display indicating that the display is installed is displayed in the display area of the LCD display 13, and a CD-ROM display is displayed in the display area.
Operation keys such as PLAY, AMS, and STOP for operating the ROM are displayed. Then, when the operation keys displayed in the display area are operated using the XY device 11 and the trigger buttons 10A and 10B, the CD-ROM display is played back in accordance with this operation (step 59). Therefore, in this example, font ROM4
4, so this data discman CD-
When a ROM disk is installed, this CD-I player operates in the Data Discman mode and can play data discs.

If it is determined in step 57 that the disc is not a CD-ROM disc, it is determined that the disc is not a CD-ROM disc based on the TOC data.
It is determined whether the disk is an I disk or another disk (step 60). If it is determined that the loaded disc is a CD-I disc, a message indicating that a CD-I disc is loaded is displayed on the LCD display 13 (step 61). That is, when a CD-I disc is loaded, a display indicating that the disc is loaded is displayed in the display area of the LCD display 13, and the title of the application software is displayed in the display area.

[0038] Then, according to the instructions of the application software, the X-Y device 11 and the trigger button 1 are pressed.
When operations are performed using 0A and 10B, the CD-I disc is played back in response to this operation (step 62). When the loaded disc is not a CD-I, a display area of the LCD display 13 displays that the loaded display is neither a CD-ROM disc nor a CD-I disc (step 63).

In this case, the CD-I player has two trigger buttons 10A and 10B and an XY device 11.
All operations can be performed with . However, with these two trigger buttons 10A and 10B and the XY device 11, sufficient operations may not be possible. Therefore, in this example, operation keys are displayed on the application screen so that various operations can be performed. In other words, the LCD display 13
When the trigger button 10A or 10B is pressed while the application screen is being displayed, the operation keys are displayed on the screen. This operation key is, for example, PLAY,
It is similar to the operation keys arranged on compact discs for music such as STOP and AMS. If the operation keys are arranged in the same way as the operation keys arranged on music compact discs, consistent operations can be performed and operability will be improved. Of course,
The key arrangement, key shape, and key role can be arbitrarily set in consideration of operability. Press this displayed operation key to
Various operations can be performed by operating the Y device 11 and the trigger buttons 10A and 10B.

In the above embodiment, CD-ROM discs and CD-I discs are discriminated based on the presence or absence of subheaders, but it is of course possible to use other type determination information instead. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

[0041]

Effects of the Invention In the present invention, the CD-I player is provided with a font ROM 44, and the data processing operation is such that character information is reproduced according to the type determination information at the start of disc playback, so that the CD-I player can be used as a data disc player. - There is an advantage that ROM discs can be played automatically.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a disc playback device of the present invention.

FIG. 2 is a diagram for explaining the present invention.

FIG. 3 is a perspective view of an example of a disc playback device.

FIG. 4 is a diagram for explaining the present invention.

FIG. 5 is a diagram for explaining the present invention.

[Explanation of symbols]

1 CD-I player 10A, 10B Trigger button 11 X-Y device 13 LCD display 15 Optical disc 20 System controller 31 CPU 33 Bus 36 System ROM 44 Font ROM

Claims (1)

[Claims] 1. A data playback device that plays back data recorded on an optical disk, in which type determination information in the disk is read at the start of playback by a disk playback operation, and character information is played back according to the type determination information. 1. A disc playback device characterized by automatically switching between processing operation and playback processing operation of audio signals and/or image information.