JPH05166345A - Disc player - Google Patents

Abstract

(57) [Abstract] [Purpose] A large amount of data can be handled by one disk playback device. [Structure] A plurality of disc drive devices a to d are connected to a CD-I player 100, and the disc drive devices a to d are operation-controlled by the CD-I player 100, and the disc drive devices a to d drive a CD- Information is captured by the I player 100.

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, for example, a CD-I player for reproducing a CD-I disc in which image information and the like are recorded together with audio information.

[0002]

2. Description of the Related Art In a system in which a CD-I (CD Interactive) player is used as a disc reproducing apparatus, a CD
In addition to audio signals, image information signals, text data signals, program data signals, etc. are recorded on the (compact disc), and interactive operation is performed on the CD-I.

That is, since this system has a reproducing function for characters, images, sounds, computer data, etc., AV consumer equipment centering on audiovisual, electronic publishing centering on characters, and information files. It is used for database services centered around, and for education and entertainment that requires interactive response.

The CD-I player is provided with a player body for playing a mounted CD, two trigger buttons and an XY device on the outer surface, and a display device such as an LCD display on the inner surface. With a lid, and a signal processing system (C
It has a PU).

[0005]

However, since a conventional CD-I player can handle only one disc, a large amount of data cannot be handled.

An object of the present invention is to provide a disc reproducing apparatus capable of handling a large amount of data as needed.

[0007]

DISCLOSURE OF THE INVENTION A disc reproducing apparatus according to the present invention is a disc reproducing apparatus for reproducing a disc in which a video signal and an audio signal are recorded on the same track as shown in FIGS. 5 and 6, for example. In the above, the control means 22 for controlling the operation of the external disk drive devices a to d based on the index information obtained from the external disk drive devices a to d is provided.

[0008]

In the disc reproducing device according to the present invention, the operation of the external disc drive device is controlled based on the index information obtained from the external disc drive device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a disc reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 shows a CD-I player according to this embodiment. Inside a player main body 1, a disk drive unit in which a mounted CD3 is rotationally driven, and an optical head is arranged along the radial direction of the CD3. A moving head drive unit, a circuit board on which a reproduction signal obtained from the optical head is processed, and the like are housed.

On the front surface 1a of the player body 1,
A headphone jack 5, a volume control dial 7, and a power source on / off switch 9 are provided, and a lid 1 that is opened and closed when the CD 3 is taken in and out of the player main body 1.
1 is attached. Trigger buttons 13 and 15, an XY device 17 and, for example, a 4-inch LCD display 19 are provided on the outer surface of the lid 11, and are operated by a switching operation of the LCD drive switch 48 (see FIG. 5). The LCD display 19 is turned on / off. The lid 11 is provided with a window 11a (closed with a transparent member), and through the window 11a,
The rotation state of the CD 3 can be visually recognized.

The lid 11 is opened when the open button 23 provided on the player main body 1 is pressed,
In this example, the reproducing operation is performed with the user closing the lid 11.

Here, as can be understood from FIG. 5, the XY device 17 moves the cursor displayed on the LCD display 19 to the XY position by pressing the upper, lower, left and right parts.
-To move in the Y (vertical-horizontal) direction,
At this time, various menus (for example, play and stop) are simultaneously displayed on the LCD display 19. Therefore, when the cursor is moved to a desired display portion and the trigger button 13 or 15 is operated, selection of the menu is performed. After that, the player main body 1 operates according to the selected menu. In addition, as the XY device 17,
A pointing device such as a track pole, a mouse or a joystick can be used.

In the CD-I player of this example,
As the disc 3, a CD-I disc, a CD-I / CD
-DA disc (mixed disc of CD-I disc and CD-DA disc) and CD-DA disc (compact disc for music reproduction) are reproduced.
The data format of the DI disk will be described.

2 to 4 show the data format of the CD-I. The CD-I records data on the basis of a CD-ROM, and the data recording unit is the CD-RO.
Like M, it is a block. And one block is 98
Corresponding to a frame, the capacity of one block is 6 (the number of audio data) x 2 (2 channels of stereo) x 98 (the number of frames) = 2352 [bytes], and the recording capacity of the entire CD-I disc is, for example, 12 mm in diameter. In the case of [cm], it is about 640 Mbytes.

There are two types of CD-I data structures, form 1 and form 2, which correspond to mode 1 and mode 2 of the CD-ROM, respectively. In addition, CD-R
Mode 1 in the OM is one in which an error detection code and an error correction code are added to one block of data to enable strong error correction, while the CD-RO is used.
In mode 2 in M, the error detection code and the error correction code are not added, and the amount of user data is expanded.

In the CD-I, the form 1 and the form 2 can be designated for each block, and the form 1 and the form 2 can be mixed on one disc.

The CD-I format is CD-R
The difference from the OM format is that a sub-header of 8 bytes is placed at the beginning of the user data. In this sub-header, each block recording audio, image and data is time-division multiplexed in block units. It Further, in order to process these in real time, necessary data is double-written and stored, and this subheader is composed of four items of file number, channel number, submode, and data type.

FIG. 2 shows the structure of the form 1. In the form 1, a sync (12 bytes) is provided at the beginning, followed by a header (4 bytes) and a subheader (8 bytes). After this, user data (2048 bytes), error detection code EDC
(4 bytes), P parity (172 bytes) for error correction, and Q parity (104 bytes) are added. This form 1 has improved error correction capability, and this form 1 is suitable for handling data such as character data and program data in which an error cannot be interpolated.

FIG. 3 shows the structure of the form 2. In the form 2, a sync (12 bytes) is provided at the beginning, followed by a header (4 bytes) and 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. Also, as shown in FIG. 4, the sub-header added to the beginning of the user data has a file number (2
Byte), channel number (2 bytes), submode (2 bytes), and data type (2 bytes).

Further, four modes are defined for writing audio data of CD-I. The first mode is a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits, which is the same as that of the current CD-DA. It is the same recording method, but this mode is intended for ultra-high-fidelity reproduction. On the other hand, in the second mode, the recording method is ADP.
CM (adaptive differential PCM) is used, the sampling frequency is 37.8 kHz, and the number of quantization bits is 8 bits. In this mode, an analog disk, that is,
It can be played with a sound quality of about LP record, and the playback time is 2 hours for stereo and 4 hours for monaural, which is intended for high-fidelity playback.

Further, in the third mode, ADPCM is used as the recording system and the sampling frequency is 37.
8 kHz, the number of quantization bits is 4, and in this mode, it is possible to reproduce with the same sound quality as FM broadcasting, and the reproduction time is 4 hours for stereo and 8 hours for monaural, which is intended for high-fidelity reproduction for a long time. ..

In the fourth mode, ADPCM is used as the recording method and the sampling frequency is 18.9.
The number of quantization bits is 4 bits, the reproduction time is 8 hours for stereo and 16 hours for monaural, and is intended for speech reproduction.

Next, the image data will be described. The image data is processed as follows according to the type. 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 sampling is performed at a ratio of 4: 2: 2, and each bit is 4 Bits are compressed and recorded, and at the time of reproduction, 8 bits are set. In the case of graphics, a CLUT (color lookup table) is used, and CLUT graphics has three modes of 256 colors (8 bits), 128 colors (7 bits), and 16 colors (4 bits). You can select and use the required color from 16 million colors.

In the case of animation, a run length code is used, which compresses image data using color information and the length between pixels, and such a code is used. , Full screen animation can be realized.

Next, the disc will be described as CD-
For I discs, mechanical dimensions such as outer diameter dimension, center hole dimension, thickness, etc., optical parameters such as refractive index, reflectance, etc., recording parameters such as disc rotation direction, recording linear velocity, track shape, track pitch, etc. The situation is the same as that of a normal compact disc (CD-DA) for music.

Whether or not the disc is a CD-I disc is determined by index information (TOC; Table Of C) of the lead-in area of the disc.
ontents), and in the case of a CD-I disc or a CD-I / CD-DA disc, (POINT =
The PSEC at A0) is set to 10. On the contrary,
For other discs, PSE when (POINT = A0)
Since C is 00, from PSEC at the time of (POINT = A0), the CD-I disc or the CD-I / C is obtained.
It can be determined whether it is a D-DA disc or another disc. Then, in the CD-I disc (POINT = A0, A1, A
The control field of 2) is (01 × 0), and (POINT = A of the CD-I / CD-DA disc.
The control field of 0) is always (01 × 0), and the other control fields are (00 × 0). Therefore, from the control field, CD
It can be discriminated whether it is an -I disc or a CD-I / CD-DA disc.

Since CD-I includes audio data and requires high-speed processing in real time, processing is performed in machine language. Therefore, a 16-bit CPU developed by Motorola is used as the CPU for this purpose. A certain 68000 system is designated, and a CD-RTOS (real-time operating system) that handles various files is based on OS9, and its program is incorporated in the system by a ROM. At least two trigger buttons and an XY device are prepared as input devices, and there are two output systems, an audio signal system and a video signal system, and a CD-I player is a CD for music. -DA can be regenerated.

FIG. 3 shows the electrical construction of the CD-I player in this example. The disk 3 is rotated by the spindle motor 2 at CLV (constant linear velocity), and the spindle motor 2 is rotated. The spindle servo circuit 4 is controlled based on the clock reproduced by the CD reproducing circuit 6, and the output of the system controller 8 is supplied to the spindle servo circuit 4.

The recording signal of the disk 3 is reproduced by the optical head 10, and the optical head 10 is supported by a biaxial device. The output of the focus / tracking servo circuit 12 is supplied to this biaxial device. It
The output of the system controller 8 is supplied to the focus / tracking servo circuit 12, and the focus / tracking servo circuit 12 servos the optical head 10 in two axes in the focus direction and the tracking direction based on the output of the photodetector. Can be applied. Further, the optical head 10 can be moved in the radial direction of the disk 3 by a slide feed mechanism 14 using, for example, a linear motor. The slide feed mechanism 14 is controlled by a sled servo circuit 16 and the sled servo circuit 16 thereof is controlled. Is supplied with the output of the system controller 8 and the slide feed mechanism 14 allows the optical head 10 to access a desired track position.

The output of the optical head 10 is supplied to the CD reproducing circuit 6 via the RF amplifier 18, and the CD reproducing circuit 6 is composed of a bit clock reproducing circuit and the like. The output of the optical head 10 is EF
This CD reproduction circuit 6 is demodulated M and subjected to error correction processing.
Are controlled by the system controller 8. Also,
The output of the CD reproducing circuit 6 is supplied to the CD-ROM reproducing circuit 20, and the CD-ROM reproducing circuit 20 is composed of a sync detection circuit, a descramble circuit, an error correction circuit and the like. In this case, the CD reproducing circuit 6 detects the sync, descrambling, checking the header address, and accessing the target block. Then, in the case of Form 1, error correction processing is further performed, and the CD-ROM reproduction circuit 20 is controlled by the system controller 20.

Further, an input is given to the system controller 8 from the input device A, and the input device A comprises two trigger buttons 13 and 15 and an XY device 17. And a CP for controlling the CD-I system
As U22, 68000 series is adopted, CP
A master controller 24 is connected to U22.
The CPU 22 and the system controller 8 are bidirectionally connected, and a bus 26 is derived from the CPU 22.

Then, the reproduction data from the CD-ROM reproduction circuit 6 is sent to the bus 26, and the RAMs 32 and 3 are sent to the bus 26 via the video controllers 28 and 30, respectively.
4 is connected. Furthermore, the system RO is connected to the bus 26.
An M36 and a non-volatile RAM 38 for backup are bidirectionally connected, and an audio decoder 40 is connected to the bus 26.

The image data of the data reproduced by the CD-ROM reproducing circuit 6 is supplied to the video controllers 28 and 30 under the control of the CPU 22, and the video controllers 28 and 30 generate the image data based on the image data. A video signal is formed. This video signal is supplied to the video synthesizer 42, and in the video synthesizer 42,
The video signal from the video controller 28 and the video signal from the video controller 30 are combined. Also,
The output of the video synthesizer 42 is the LCD drive circuit 44.
Is supplied to the LCD display 19 via
The drive of the display 19 can be turned on / off by the LCD drive switch 48.

Further, of the data reproduced by the CD-ROM reproducing circuit 6, audio data is supplied to the audio decoder 40 under the control of the CPU 22, and when the audio data is ADPCM, the audio decoder 40 performs ADPCM. Is decoded. Also, the decoded audio data is sent to the DA converter 50.
Is supplied to the headphone output terminal 5 via the low-pass filter 52 and the amplifier 54, and is converted into an analog signal. It can be set by 7).

The CD-I player 100 configured as described above has a control line 100a, as can be understood from FIG.
~ 100d through a plurality of disk drive device a
It is possible to control the operations of d to d, and it is possible to display the same display content as the display content of the LCD display 19 on the external TV monitor 200. In this case, the operation of each of the disk drive devices a to d is controlled by the CPU 22 in accordance with the operation of the input device A, etc.
The processing procedure performed in U22 will be described.

In FIG. 7, first, the TOC information is taken into the CPU 22 from each of the disk drive devices a to d (step S ₁ ), and various menus are displayed on the TV monitor 200 based on the TOC information (step S ₁ ). S ₂ ), and when the input device A is operated to select information (YES in step S ₃ ), TOC information corresponding to the selected information is searched (step S ₄ ), and the searched TOC is searched. Based on the information, the operation of the system controller of the disk drive device (corresponding to the selected information) is controlled (step S ₅ ), and the application is displayed on the TV monitor 200 (step S ₅ ).
₆ ).

As described above, in this embodiment, C
Since a plurality of disc drive devices a to d connected to the D-I player 100 are operation-controlled by the CD-I player 100, a large amount of data can be handled.

The present invention is not limited to the above embodiments, but can be widely applied without departing from the scope of the present invention.

[0039]

As can be understood from the above description, in the disc reproducing apparatus according to the present invention, the operation of the external disc drive device is controlled based on the index information obtained from the external disc drive device. There is an advantage that a large amount of data can be handled by using a plurality of drive devices.

[Brief description of drawings]

FIG. 1 is an external view of a disc reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram of form 1.

FIG. 3 is an explanatory diagram of Form 2.

FIG. 4 is an explanatory diagram of a subheader.

FIG. 5 is a system block diagram of the preferred embodiment.

FIG. 6 is an explanatory diagram showing a system example.

FIG. 7 is a flowchart of an example.

[Explanation of symbols]

 1 Player Main Body 13, 15 Trigger Button 17 XY Device 100 CD-I Player a to d Disk Drive Device 200 TV Monitor

Claims (1)

[Claims] 1. A disc reproducing apparatus for reproducing a disc in which a video signal and an audio signal are recorded on the same track, the control for controlling the operation of the external disc drive device based on index information obtained from the external disc drive device. A disc reproducing apparatus comprising means.