JPH04319570A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To obtain a disk reproducing device constituted so that no body exept a registered person is capable of reproducing. CONSTITUTION:The contents information of the disk is registered to a nonvoratile memory 37, when the disk whose contents information is registered is reproduced, the contents information is compared with the contents information of the nonvoratile memory 37, by rejecting the disk that no contents information is coincident, the disk reproducing device capable of making the disk a private disk is obtained.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a disc playback device capable of playing back a CD-I disc that stores image information, etc. in addition to audio information, and particularly relates to a disc playback device for playing back a private disc. Regarding equipment.

0002

[Prior Art] CD-I (Compact Disk-
Interactive) focuses on the characteristics of CDs, such as their small size, large storage capacity, ease of random access, and suitability for mass productivity.
D, play it on a standard player, and
A user can easily access information recorded on a CD using a pointing device.

Such a standard player for CD-I is constructed as shown in FIGS. 6 and 7. FIG. 6 shows the player with the lid closed, and FIG. 7 shows the player with the lid opened. The overall size of this player is, for example, width 14
0 mm, length 170 mm, and height 60 mm, it is compact and easy to carry.

The player 1 has a substantially rectangular box-shaped housing body 2 made of synthetic resin or the like, and inside the housing body 2 is a disk for driving CD-I media (hereinafter referred to as CDM). It includes a drive unit, a head drive unit that moves the optical pickup in the radial direction of the CDM, a circuit that processes a reproduced signal from the optical pickup and outputs the processed signal, and a computer that controls these circuits.

A headphone jack 3, a volume control dial 4, and a power on/off switch 5 are provided on the front side 2a of the housing body 2. In addition, the front side 2a of the housing body 2
An open button 6 is disposed on the front upper edge of. CD
- An inner lid 7 is rotatably disposed on the casing body 2 of the I player 1, and when the open button 6 is pressed, the inner lid 7 is opened. When the inner lid 7 is opened, the CDM can be taken out from the housing body 2 and inserted into it. 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 attached CDM can be confirmed.

[0006] Further, on the front edge of the inner lid 7, a trigger key 10a, a trigger key 10b, and an X-Y device 1 are provided.
1 is arranged. The X-Y device 11 can be moved in the X direction and
The screen position of the LCD, which will be described later, can be specified in the direction. Note that, as such an XY device 11, a pointing device such as a trackball, a mouse, or a joystick can be used. The trigger keys 10a and 10b can be operated together with the X-Y device according to the instructions displayed on the LCD screen.
It is possible to perform playback, etc.

[0007] A lid body 12 is rotatably disposed on the inner lid 7. This lid 12 can be opened by hand. This lid body 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. On the inner surface 12a of the lid 12, an LCD 13 having a size of, for example, 4 inches is disposed. When the lid body 12 is opened, FIG.
As shown in the figure, the screen of the LCD 13 becomes visible.

[0008] Further, on the inner surface 12a of the lid body 12, an LCD is provided.
A drive switch 14 is provided. By operating this LCD drive switch 14, ON/OFF of the LCD 13 can be controlled. By folding the lid 12 forward in FIG. 7, the player can be used with the same feeling as a commonly used portable compact disc player, as shown in FIG. In this case, when the lid body 12 is closed, the LCD 13 is automatically turned off by the operation of the LCD drive switch 14, but when listening only to music, the trigger keys 10a and 10b, the X-Y device 11
The keys function as dedicated keys for audio playback. For example, if the trigger key 10a is
The pause key and trigger key 10b function as a stop key. Thereby, even when driving the LCD 13 is stopped, various audio reproduction operations can be performed freely.

[0009]

[Problems to be Solved by the Invention] When playing CDMs using the CD-I standard player as described above, some CDMs may be kept secret and must not be shown or heard by others. In particular, there is a need for a disc reproducing apparatus that cannot reproduce the contents recorded on a CDM, such as text data and program data, even if the contents are reproduced by another person.

The object of the present invention is to obtain a disc playback device that can meet the above requirements.
This routine is made so that only those who have registered to make M private can play it, and it can be stored as a private disk.

[0011]

[Means for Solving the Problems] The disc playback device of the present invention, as shown in FIG. Output and storage means 3
7 and a comparison means 20 for comparing the output of the storage means 37 stored in the storage means 37, and if the comparison result from the comparison means 20 does not match, the private disk 15, which is played back, is put into a non-playback state. .

0012

[Function] According to the disc playback device of the present invention, a private disc that has been registered in advance cannot be played by anyone other than the user, so a secret or confidential disc can be obtained without worrying about being seen by others.

[0013]

[Embodiment] Hereinafter, the disc playback device of the present invention will be described.
An example applied to a standard player will be explained with reference to drawings.

[0014] The disc playback device of this embodiment can play a CDM to which the present invention is applied, a disc in which a CDM and an audio disc are mixed, and a normal audio disc, that is, a CDM.
In this example, the format of CD-I will be explained.

[0015] Data formats for CDM using the CD-I system include Forms 1 and 2, and CD-ROM mode 1
and 2. These forms can be specified for each block or can be mixed on one disk as described above. The difference between the CD-I format and the CD-ROM format is that an 8-byte subheader is provided at the beginning of the user data (2048 bytes), and each block in which audio, images, and data are recorded is stored in the subheader. is time-division multiplexed. 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.

Each of the above formats will be explained with reference to FIGS. 2 and 3. In form 1, the first sink (12 bytes) S
Y is provided, followed by a header (4 bytes) HE
is provided, and further a subheader (8 bytes) SHE is provided. After this, user data (2048 bytes)
UD1 is provided, and an error detection code (4 bytes) EDC, P parity (172 bytes) P, and Q parity (104 bytes) Q for error correction are added to this. 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. 2B shows the structure of Form 2. In form 2, a sink (12 bytes) SY is provided at the beginning, followed by a header (4 bytes) HE,
Furthermore, a subheader (8 bytes) SHE is provided. After this, user data (2324 bytes) UD2 is provided, and a reserve area (4 bytes) RE is provided. This form 2 is suitable for handling interpolable data such as audio data and video data.

[0018] The subheader SHE added to the beginning of the user data has a file number (
2 bytes) FMO and channel number (2 bytes) C
It consists of HNO, submode (2 bytes) SM, and data type (2 bytes) DTY.

[0019] CDM includes mechanical dimensions such as outer diameter dimension, center hole dimension, and thickness, optical parameters such as refractive index and reflectance, recording parameters such as disk rotation direction, recording linear velocity, track shape, and track pitch, and usage. All the environmental conditions etc. are configured in the same way as a normal CD for music.

[0020] Therefore, like a CD, TOC (Table
of contents: table of contents information). This TOC is present in the lead-in of the disk before the sync SY shown in Figures 2A and B, and has almost the same content as the sub-coding, consisting of 96 bytes (98 frames total) with two synchronization patterns of 8 bits S0 S1 at the beginning. ) consists of P1 ~
P96 for access, R1 to R96 to W1 to W
The 6 bits of each frame of 96 are used for displaying still images, characters for karaoke, etc.

Although writing of audio data will not be explained, video data is processed according to the type of image data. That is, in the case of a natural image, the sampling frequency of the luminance signal Y is set to 7.6 MHz, and the sampling frequency of the color difference signal U is set to 7.6 MHz.
, the sampling frequency of V is 3.8MHz, and 4
: Sampled at a ratio of 2:2. Then, each bit is compressed to 4 bits and recorded, and when reproduced, it is made into 8 bits.

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.

[0023] 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.

FIG. 1 shows a disc reproducing apparatus according to the present invention as shown in FIG.
This is a system diagram when applied to an I standard player. In general, CD-I includes audio data and requires high-speed processing in real time, so processing is performed using machine language. Therefore, as a CPU,
A 68000 series 16-bit CPU is specified. In addition, CD-RTOS (real-time operating system), which handles various files, is OS9.
The program is incorporated into the system in ROM. As input devices, at least two trigger keys and an XY device are prepared. There are also two output systems: audio and video. The CD-I player is capable of playing regular music CDs.

In FIG. 1, the CDM 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. In addition, the spindle servo circuit 22
is supplied with the output of the system controller 20.

The recorded signal of the CDM 15 is reproduced by the optical head 23. 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 25 in two axes, the focusing direction and the tracking direction, based on the output of the photodetector.

Further, the optical head 23 is moved by a slide feeding mechanism 24 using, for example, a linear motor.
It is possible to move in the radial direction of 5. This slide feed mechanism 24 is controlled by a feed servo circuit 26. The output of the system controller 20 is supplied to the feed servo circuit 26 . 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 a bit clock reproducing circuit, an EFM demodulating circuit,
It consists of a CIRC error correction circuit, etc. In the CD playback circuit 28, the output of the optical head 23 is EFM demodulated and subjected to error correction processing. This CD playback circuit 28 is controlled by the system controller 20.

The output of the CD playback circuit 28 is transmitted to the signal processing circuit 2.
9. The signal processing 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 signal processing circuit 29 is controlled by the system controller 20.

[0030] Input is given to the system controller 20 from an input device 30. The input device 30A has two trigger keys 10a, 10b and an XY device 11, and further has a private key 30B.

31 is a CPU for controlling the CD-I system. As the CPU 31, a 68000 series CPU is used. A master controller 32 is connected to the CPU 31 . Further, the CPU 31 and the system controller 20 are bidirectionally connected. CPU31
A bus 33 is derived from. Note that the CPU 31 and the master controller 31 may be integrated into one chip.

The data reproduced by the signal processing circuit 29 is
Sent to bus 33. The bus 33 includes RAMs 35A and 35 via video controllers 34A and 34B, respectively.
B is connected. The bus 33 also includes a system ROM.
36. A non-volatile RAM 37 for backup is bidirectionally connected. Further, an audio decoder 38 is connected to the bus 33.

Image data among the data reproduced by the signal processing circuit 29 is supplied to video controllers 34A and 34B under the control of the CPU 31. Video controllers 34A and 34B form a video signal based on this image data.

This video signal is transmitted to the video synthesizer 3.
9. 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 supplied to the above-mentioned LCD 13 via an LCD drive circuit 40. The drive of the LCD 13 can be turned on/off by an LCD drive switch 14.

Audio data of the data reproduced by the signal processing circuit 29 is supplied to an audio decoder 38 under the control of the CPU 31. Among the four modes of audio data, for example, in the case of ADPCM,
The audio decoder 38 decodes ADPCM. The decoded audio data is supplied to the D/A converter 41 and converted into an analog signal. The signal is then output from the headphone output terminal 3 via the low-pass filter 42 and amplifier 43. 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 in the above configuration will be explained using FIGS. 4 and 5.

First, a method for setting a private disk in this example will be explained with reference to FIG.

Using the trigger keys 10a and 10b of the input device 30A shown in FIG. 1 and the X-Y device 11, a control screen is displayed on the LCD 13 as shown in the first step ST1 in FIG. Proceed to ST2.

[0039] In the second step ST2, a private key is set. Here private key 30B
When is pressed, it is turned on, and when it is pressed again, it is turned off.

In the next third step ST3, the system controller 20 determines whether a disk, that is, the CDM 15 is placed on the turntable on the spindle motor 21, and if the CDM 15 is not placed, the process proceeds to the fourth step ST4. For example, a message such as "Please insert a disc" is displayed on the LCD 13.

[0041] If the third step ST3 is YES, proceed to the fifth step ST5, and display a message such as "This disc is a private disc, Y/N" on the LCD.
Do it on 13.

Here, the operator inputs YES or NO using either the trigger key 10a (YES) or the trigger key 10b (NO) of the input device.

The system controller 20 makes a YES/NO determination in the sixth step ST6, and if NO, proceeds to the seventh step ST7 and displays, for example, "Registration has been canceled" on the LCD 13. If YES, in an eighth step ST8, a message such as "Registered" is displayed on the LCD 13, and the process proceeds to the next ninth step ST9, where the disc playback device is put into a playing state.

At the time of registration of the present invention, the system controller 20 stores the contents of the TOC in the nonvolatile RAM 37, and at the same time stores the ID (identification number) at the time of private key reproduction when setting the private key.

Of course, the title number of the disc and the like are also stored in the TOC of the CDM that has been made into a private disc in this manner.

[0046] Here, the operation when, for example, the CDM15, which has been made into a private disc in this way, is played back by a CD-I standard player will be explained with reference to FIG. Here, the normal CDM 15 that is not privatized is played in normal mode, and in this example, another check flow is entered.

[0047] In FIG. 5, the operator inserts the private disc into the disc playback device, puts it in the playback state, and presses the private key 30B as shown in the first step STE1.

In the second step STE2, the system controller 20 determines whether or not it is a private disk registered in the nonvolatile RAM 37, and if NO, the private disk is ejected from the playback device in a third step STE3.

[0049] In the second step STE2, the non-volatile RAM
If the CDM 15 is registered in the turntable 37, proceed to the next fourth step STE4, read the contents of the TOC of the CDM 15, and store the title of the disc currently placed on the turntable in the non-volatile RAM 37. It is determined whether the title is the same as the existing title, and if NO, the CDM 15 is rejected in the third step STE3.

If the fourth step STE4 is YES, indicating that the title of the disc is currently set, then the fifth step STE5 puts the disc playback device into a play state.

In the above case, the system controller 20 displays the LCD to the operator when the private key 30B is pressed.
13, for example, a message such as "Please enter your ID" is displayed, and after confirming the ID, the check flow shown in FIG. A CD-I standard player that cannot be played by anyone other than the person who is using the CD-I standard player is obtained.

[0052]

According to the disk playback device of the present invention, a disk whose TOC contents are stored in advance in the disk playback device can be made to function as a private disk.
You can obtain something that can maintain the confidentiality of the disk.

[Brief explanation of drawings]

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

FIG. 2 is a diagram illustrating the format of the disc playback device of the present invention.

FIG. 3 is an explanatory diagram of the format of a subheader according to the present invention.

FIG. 4 is a flowchart when setting a private disk in the disk playback device of the present invention.

FIG. 5 is a flowchart when the disc playback device of the present invention plays.

FIG. 6 is a perspective view of a conventional disc playback device in a closed state.

FIG. 7 is a perspective view of a conventional disc playback device in an open state.

[Explanation of symbols]

1 CD-I player 2　Housing body 13 LCD 15 CDM 20 System controller 30A Input device 30B Private key

Claims (1)

[Claims] Claim 1: Comparison of a storage means storing information that the disk is a private disk, an output of the private disk being played back, and an output of the storage means storing information stored in the storage means that the disk is a private disk. means, and if the comparison results from the comparing means do not match, the private disc to be played is brought into a non-playing state.