JPH04248161A - Disk player - Google Patents

Abstract

PURPOSE:To satisfactorily release the pause from its setting. CONSTITUTION:A pause button 13 is disposed to a main body part of the player. The pause button 13 is connected with a clock terminal of a T flip-flop 14, and noninversion and inversion output terminals of this flip-flop 14 are connected to a system controller 30. When the pause button 13 is turned on under the reproducing state, an output of the flip-flop 14 is changed, and hence reproducing processing of a disk by the system controller 30 and output processing of a regenerative signal by a CPU 41 are suspended, so that the pause state is effected. When the pause button 3 is turned on under the pause state, the output of the flip-flop 14 is changed, and the processing operations by the system controller 30 and the CPU 41 are resumed, so that the pause state is released from its effectiveness. By this method, the pause can thus be released from its setting satisfactorily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player capable of playing back CD-I discs 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. The CD-I system has the ability to play back text, images, audio, computer data, etc.
It is expected to become a new form of media, as it can be used for AV consumer equipment centered on audio/video, electronic publishing centered on text, database services centered on information files, education/entertainment centered on dialog responses, etc. has been done.

Various specifications have been established for the CD-I system in order to maintain compatibility and enable it to be widely used for home use. In other words, in the CD-I system, a 16-bit CPU (equivalent to 68,000) is used as the CPU, and CD-RTOS (Compact DiscRe
al-Time Operating System)
is used, two trigger buttons and an XY device are used as input devices, and two systems, audio and video, are provided as output systems. In addition, CD-I players are equipped with regular music compact discs (CD-D
A) is defined so that it can be played.

0004

[Problems to be Solved by the Invention] It is conceivable to provide such a CD-I player with a pause function. In this case, it is necessary to interrupt the process of reproducing information from the disc and the process of outputting the reproduced information.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a disc player that can effectively cancel the pause setting.

[0006]

[Means for Solving the Problems] The present invention provides a system controller that controls the operation of a pickup and a spindle motor to reproduce information from a disc, a CPU that processes the output of information that is reproduced from the disc, and a pause setting means. and a pause release means, the processing of the system controller and the CPU is interrupted when the pose setting means is performed, and the processing of the system controller and the CPU is restarted when the pause is released by the pause release means. It is.

[0007]

[Operation] When pause setting is performed by the pause setting means 13, the disc playback process by the system controller 30 is interrupted, and the output process by the CPU 41 is also interrupted, resulting in a pause state. On the other hand, when the pause release unit 13 releases the pause, the system controller 30 restarts the disc playback process, the CPU 41 restarts the output process, and the pause state is released.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This example is an example applied to a CD-I player.

FIGS. 1 and 2 are perspective views showing the overall structure of the embodiment. The CD-I player 1 of this example has a liquid crystal display (LCD) 1 so that it can be easily carried outside.
9 are integrated, and the size and weight are reduced by integrating circuits and using chip parts. The overall size of this CD-I player 1 is, for example, 140 mm in width and 170 mm in length.
mm, and the height is 60 mm.

[0010] Inside the housing of the player body 2 of the CD-I player 1 is a disc table 3 on which a disc is placed.
A disk drive unit that rotationally drives the optical pickup 4, a pickup drive unit that moves the optical pickup 4 in the radial direction of the disk, a circuit board that processes the reproduction signal from the optical pickup 4,
It accommodates 68,000 CPUs, etc.

A pause setting/cancellation button (hereinafter referred to as "pause button") 1 is provided on the front side 2A of the player main body 2.
3 is arranged. By pressing the pause button 13 in the playback state, a pause state can be created, and by pressing the pause button 13 in this pause state, the pause state can be canceled. That is, by sequentially pressing the pause buttons 13, it is possible to set or cancel a pause in a toggle manner.

Further, a headphone jack 5, a volume adjustment dial 6, and a power on/off switch 7 are provided on the front side 2A of the player main body 2. The front left corner portion of the player main body portion 2 is formed higher than the other portions, and an open button 8 is disposed on the upper surface thereof.

An inner lid 9 is rotatably disposed on the player body 2. As shown in FIG. As shown in FIG. 1, when the above-mentioned open button 8 is pressed with the inner lid 9 closed, the inner lid
The locked state is released, and the inner lid 9 is in an open state as shown in FIG. With the inner lid 9 open in this manner, a disc is loaded into or taken out of the disc loading section 10 of the player main body 2 in which the disc table 3 is disposed in the center.

The inner lid 9 is provided with a window 11 made of a transparent material. As a result, even when the inner lid 9 is closed as shown in FIG.
It is now possible to check the rotational status of the disc installed in the machine. Additionally, a trigger button 12A is provided on the front edge of the inner lid 9.
, 12B, and a pointing device 12 consisting of an XY device 12C. X-Y device 12C
is the part that is offset vertically, horizontally, and horizontally from the center (
The screen is configured so that the position in the X direction and the Y direction can be specified by pressing the button (indicated by a triangle mark).

Furthermore, an outer cover 18 is rotatably disposed on the inner cover 9. This outer cover 18 can be opened manually. This outer cover 18 can be opened to an opening/closing angle of 90 degrees or more, and can be fixed at a predetermined opening/closing angle θ. A liquid crystal display 19 having a size of, for example, 4 inches is disposed on the back surface 18A of the outer cover 18. When the outer cover 18 is opened, the liquid crystal display 19 is exposed as shown in the figure, and the screen can be viewed.

An LCD drive switch 20 is provided on the back surface 18A of the outer cover 18. This LCD drive switch 20
The on/off of the liquid crystal display 19 can be controlled by the operation.

In the CD-I player 1 of this example, the CD-I
discs, CD-I/CD-DA discs (mixed discs of CD-I discs and CD-DA discs),
CD-DA discs (normal compact discs for music reproduction) can be played. Here, CD-
The data format of I will be explained.

[b1] Data structure CD-I records data in a format based on CD-ROM. The data recording unit is CD-RO
Like M, it is a block. 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) = 23
It is 52 bytes. The total recording capacity of a CD-I disc is 12 mm in diameter.
In the case of a cm disk, it will be approximately 640MB.

There are two types of CD-I data structures: Form 1 and Form 2. This corresponds to mode 1 and mode 2 of the CD-ROM, respectively.

[0020]Mode 1 in CD-ROM is as follows:
An error detection code and an error correction code are added to one block of data to enable powerful error correction. Mode 2 in CD-ROM is such that no error detection code or error correction code is added, allowing a large amount of user data. CD-I
With this, Form 1 and Form 2 can be specified for each block, and Form 1 and Form 2 can be mixed on one disk.

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.

FIG. 3A shows the structure of Form 1. In form 1, 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 (2048 bytes) is provided, to which are added an error detection code EDC (4 bytes), P parity (172 bytes), and Q parity (104 bytes) for error correction. Form 1 has a high error correction ability and is suitable for handling data such as character data and program data for which error interpolation is not possible.

FIG. 3B 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 data that can be error interpolated, such as audio data and video data.

As shown in FIG. 4, the subheader added to the beginning of user data includes the file number (2 bytes), channel number (2 bytes), and submode (2 bytes).
(byte) and data type (2 bytes).

[b2] Audio data writing CD-
Four modes are determined for writing audio data of I. The first mode has a sampling frequency of 44
．． 1kHz, quantization bit number 16 bits, current CD
-This is the same recording method as DA. This mode is intended for ultra high-fidelity playback.

In the second mode, ADP is used as the recording method.
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, it is possible to reproduce sound quality comparable to that of an LP record. Playback time: 2 hours in stereo, 4 hours in monaural
It's time. This mode is intended for high-fidelity playback.

In the third mode, ADP is used as the recording method.
CM is used. Sampling frequency is 37.8kHz
z, the number of quantization bits is 4 bits. In this mode, sound quality comparable to that of FM broadcasting can be reproduced. Playback time is 4 hours in stereo and 8 hours in monaural. This mode is
The purpose is high-fidelity playback for long periods of time.

In the fourth mode, ADP is used as the recording method.
CM is used. Sampling frequency is 18.9kHz
z, 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.

[b3] Writing of video data 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. Each of the 8 bits is compressed to 4 bits and recorded, and is converted into 8 bits when played back.

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 approximately 16.8 million colors.

In the case of animation, run-length codes are used. This compresses image data using color data and the number of consecutive pixels. You can use this code to create full-screen animations.

[b4] Disc For CD-I discs, external diameter dimensions, center hole dimensions, mechanical dimensions such as thickness, optical parameters such as refractive index and reflectance, disc rotation direction, recording linear velocity, track shape, Recording parameters such as track pitch, usage environment, etc. are all the same as a normal compact disc for music (CD-DA).

Then, whether or not it is a CD-I disc is determined by checking the TOC (Table of Contents) in the lead-in area of the disc.
Of Contents). That is, CD-I disc or CD-I
/For CD-DA discs, 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, from the PSEC when POINT=A0, it can be determined whether the disc is a CD-I disc, a CD-I/CD-DA disc, or another disc. Further, the control fields at POINT=A0, A1, and A2 of the CD-I disc are set to "01X0". CD-I/C
The control field at POINT=A0 of the D-DA disc is always set to "01X0", and the other control fields are set to "00X0". Therefore, from the control field, whether it is a CD-I disc or a
It can be determined whether it is a DI/CD-DA disc.

[b5] Since the hardware CD-I includes audio data and requires high-speed processing in real time, processing is performed using machine language. As the CPU for this purpose, the 68000 series, which is a 16-bit CPU developed by Motorola, is designated. In addition, CD-RTOS handles various files.
(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. Furthermore, the CD-I player is capable of playing music CD-DA.

Next, the internal configuration of the CD-I player 1 will be explained using FIGS. 5A and 5B. In the figure, the disk table 3 on which the disk 16 is placed is driven at a constant linear velocity (CLV) by a spindle motor 31 during playback.
It is rotated by this. The rotation of this motor 31 is controlled by a spindle servo circuit 32. In other words, C
The clock signal regenerated by the D regeneration circuit 38 and the reference signal from the system controller 30 are supplied to the servo circuit 32 and compared in phase, and the rotation of the motor 31 is controlled based on the comparison error signal.

[0036] The above-mentioned pointing device 12 is connected to the system controller 30. By operating the pointing device 12 with the inner lid 9 closed, the disc 16 can be rotated and a reproduction operation can be started.

Furthermore, the recorded signal on the disk 16 is reproduced by the optical pickup 4. The optical pickup 4 is supported by a two-axis device. This two-axis device is controlled by a focus/tracking servo circuit 35. That is, the focus error signal and the tracking error signal detected by the preamplifier (matrix) 37 from the reproduction signal of the optical pickup 4 are supplied to the focus/tracking servo circuit 35, and A servo is applied to.

Further, the optical pickup 4 can be moved in the radial direction of the disk by a slide feed mechanism 34 using, for example, a linear motor. This slide feed mechanism 3
4 is controlled by a thread servo circuit 36. Although not mentioned above, direct current tracking deviation is caused by the servo circuit 36
The slide feeding mechanism 34 is controlled and adjusted.

The operations of the servo circuits 35 and 36 are controlled by the system controller 30, and the optical pickup 4 can be accessed to a desired track position by track jump or the like.

Furthermore, the reproduction signal from the optical pickup 4 is supplied to a CD reproduction circuit 38 via a preamplifier 37. The CD reproducing circuit 38 includes a bit clock reproducing circuit, an EFM demodulating circuit, a CIRC error correcting circuit, and the like. In the CD reproducing circuit 38, the reproduced signal from the optical pickup 4 is EFM demodulated and further subjected to error correction processing. The operation of the CD playback circuit 38 is controlled by the system controller 3.
Controlled by 0. Note that control data such as subcode data detected by the CD playback circuit 38 is supplied to the system controller 30 and used for determining the type of disc, controlling access to the optical pickup 4, and the like.

The output of the CD reproducing circuit 38 is supplied to a CD-ROM reproducing circuit 39. The CD-ROM playback circuit 39 includes a sync detection circuit, a descrambling circuit, an error correction circuit, and the like. In the CD-ROM playback circuit 39,
A sink is detected and unscrambled. and,
The header address is checked and the desired block is accessed. In the case of Form 1, error correction processing is further performed. The operation of the CD-ROM playback circuit 39 is controlled by the system controller 30.

Further, 41 is a CPU for controlling the CD-I system, and a 68000 series CPU is used. A master controller 42 is connected to the CPU 41 . This CPU 41 and the system controller 30 described above are bidirectionally connected. A bus 43 is derived from the CPU 41. Note that the CPU 41 and the master controller 42 may be integrated into one chip.

Data reproduced by the CD-ROM reproduction circuit 39 is sent to the bus 43. A RAM 45A is connected to the bus 43 via video controllers 44A and 44B, respectively.
, 45B are connected. Further, a system ROM 46 and a backup nonvolatile RAM 47 are bidirectionally connected to the bus 43. Furthermore, an audio decoder 48 is connected to the bus 43.

Image data of the data reproduced by the CD-ROM reproduction circuit 39 is supplied to video controllers 44A and 44B under the control of the CPU 41, and a video signal is formed based on this image data. Video signals formed by video controllers 44A and 44B are each supplied to a video synthesizer 49 and synthesized. The synthesized video signal from the video synthesizer 49 is then supplied to the liquid crystal display 19 via the LCD drive circuit 50, and an image is displayed on the liquid crystal display 19. LCD for turning on/off the liquid crystal display 19
Drive switch 20 is connected to LCD drive circuit 50.

Furthermore, audio data among the data reproduced by the CD-ROM reproduction circuit 39 is supplied to an audio decoder 48 under the control of the CPU 41. This decoder 48 is also supplied with audio data to be reproduced by the CD reproduction circuit 38. Audio data is ADP
In the case of CM, the decoder 48 decodes ADPCM. After the audio data from the decoder 48 is converted into an analog signal by the D/A converter 51,
The signal is led out to the output terminal (headphone jack) 5 via a low-pass filter 52 and an amplifier 53. Output terminal 5
The level of the audio signal derived to is set by the volume adjustment dial 6.

Further, the pause button (push button switch) 13 is connected to the clock terminal CK of the T flip-flop 14. The non-inverting output terminal (Q) and the inverting output terminal (Q) of the flip-flop 14 are connected to the system controller 30. In the playback state, when the pause button 13 is turned on, the output signal of the non-inverting output terminal of the flip-flop 14 changes from, for example, a low level "L" to a high level "H", and the pause button 13 is activated under the control of the system controller 30. state. In addition, when the pause button 13 is turned on in the pause state, the output signal of the inverted output terminal of the flip-flop 14 changes from low level "L" to high level "H", and the system controller 30 controls the pause state. is canceled.

FIG. 6 shows the flow of pose setting/cancellation.
When the pause button 13 is turned on (step 61),
The output signal of the non-inverting output terminal of the flip-flop 14 changes from low level "L" to high level "H", and this becomes a HALT signal to the system controller 30 (step 62). The system controller 30 then interrupts the process (step 63).

Next, the system controller 30 sends the CP
A HALT signal is supplied to the U (main CPU) 41 (step 64), and the CPU 41 interrupts processing (step 65).

In this way, the processing of the system controller 30 and the CPU 41 is interrupted, resulting in a pause state. Although not mentioned above, in the pause state, the liquid crystal display 1
The image displayed at 9 is kept stationary, and the audio is muted.

In addition, in the pause state, the output signal of the inverting output terminal of the flip-flop 14 supplied to the system controller 30 changes from the low level "L" to the high level "H".
”, that is, whether the pose has been released (step 66).

When the pause button 13 is turned on to release the pause, the system controller 30 reinstalls various servos related to the optical pickup 4 and spindle motor 31 and restarts the playback process of the disk 16 (step 67), and the reproduction information output processing by the CPU 41 is also restarted (step 68).

[0052] Then, the processing systems are checked (matched) between the system controller 30 and the CPU 41 (step 69). For example, if output processing by the CPU 41 is interrupted in the middle of a block of reproduction signals, disk reproduction under control of the system controller 30 is performed from the beginning of that block.

As described above, according to this example, the pause button 1
By pressing 3 in sequence, the system controller 30
Also, the processing of the CPU 41 can be interrupted or restarted in a toggle manner, and the pause setting can be canceled in a good manner.

[0054]

According to the present invention, by operating the pause setting means or canceling means, it is possible to interrupt or restart the disk playback process by the system controller or the playback signal output process by the CPU, and the pause setting can be canceled. can be carried out well.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the inner lid of the embodiment in a closed state.

FIG. 2 is a perspective view of the embodiment with the inner lid opened.

FIG. 3 is a diagram showing the format of a CD-I sector.

FIG. 4 is a diagram showing the structure of a subheader.

FIG. 5 is a diagram showing the internal configuration of the embodiment.

FIG. 6 is a diagram showing a flow of pose setting/cancellation.

[Explanation of symbols]

1 CD-I player 2 Player body part 3 Disc table 9 Inner lid 10 Disc mounting part 12 Pointing device 13 Pose setting/cancellation button 14 T flip-flop 16 Disc 18 Outer lid 19 Liquid crystal display 30 System controller 31 Spindle motor

Claims (1)

[Claims] 1. A system controller that controls the operation of a pickup and a spindle motor to reproduce information from a disk, a CPU that outputs information reproduced from the disk, a pause setting means, and a pause canceling means. and when the pause setting means sets the pause, the processing of the system controller and the CPU is interrupted, and when the pause canceling means cancels the pause, the processing of the system controller and the CPU is restarted. Disc player with special features.