JPH04245090A - Disk reproducer - Google Patents

Abstract

PURPOSE:To recognize a song number of a song reproduced at present by a user by displaying the number of the reproducing song on an LCD display. CONSTITUTION:In a CD-I player 1 for reproducing a disk 15 in which image information, etc., other than voice information are recorded, a system controller 20 for reproducing the disk 15, an optical head 23, a CD reproducer 28, a CD- ROM reproducer 29, a CPU 31, and displays 13, 13b for displaying reproduction output reproduced from information recorded on the disk 15 thereby, are provided. When song information is reproduced from the disk 15, at least the song number of a reproducing song is displayed on the displays 13, 13b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc playback device suitable for use in a so-called CD-I player, which plays back 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. Such a CD-I system supports characters,
Since it has the ability to playback images, audio, computer data, etc., it is useful for AV consumer electronics mainly for audio/visuals, electronic publishing mainly for text, database services mainly for information files, and education mainly for dialogue response.・It can be used for entertainment, etc., and is expected to be a new form of media. In the CD-I system, in order to maintain compatibility and make it widely available for home use,
Various specifications have been established. In other words, the CD-I system uses a 68000 series CPU (a 16-bit microprocessor developed by Motorola) and a real-time operating system that handles various files based on the widely used OS9. It will be done. Two trigger buttons and an XY device are used as input devices, and two output systems, audio and video, are provided. Furthermore, the CD-I 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, and two trigger buttons and an
- An inner lid in which a Y device, etc. is arranged and serves as a control panel, and an inner lid that serves as a control panel is protected, and a display section such as an LCD display is provided on its inner surface. Consists of an outer lid. Further, this CD-I player is driven using dry batteries or a commercial power source.

0003

[Problem to be solved by the invention] By the way, the above-mentioned CD
-CD-DA discs and CD-I/CD- with I player
When playing the CD-DA area of a DA disc, the number of the song being played is not displayed, and I would like to display the number of the song being played while the song is being played. There was a request. The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to propose a disc playback device that allows the user to recognize the number of the song currently being played.

0004

[Means for Solving the Problems] The disc reproducing apparatus of the present invention, as shown for example in FIGS. disc playback sections 20, 23, 28, 29, and 31 that play back the information recorded on the disk 15, and a display section 13 that displays the playback output obtained by playing back the information recorded on the disk 15 by the disk playback sections 20, 23, 28, 29, and 31. , 13b, and when music information is played back from the disc 15, at least the song number of the music information being played is displayed on the display sections 13 and 13b.

[0005]

[Operation] According to the present invention described above, when playing back song information from the disc 15, at least the song number of the song information being played back is displayed on the display sections 13, 13b.
The user can recognize which song is currently being played.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the disc reproducing apparatus of the present invention will be described in detail below with reference to the drawings. First, Figures 3 to 5
The external appearance of the disc playback device of this example will be explained with reference to FIG. In FIG. 3, reference numeral 1 indicates the CD-I player of this example as a whole. This CD-I player 1
is equipped with an LCD display so that it can be easily carried outside.
The display 13 is integrated, and it is made smaller and lighter by integrating circuits, using chip parts, etc. 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 case of the player body 2 of the CD-I player 1, there are 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. A circuit board for signal processing of reproduced signals from is housed. Furthermore, 68
It houses a computer consisting of a 000 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 the front side surface 2a. On the player body 2 of the CD-I player 1,
The inner lid 7 is rotatably arranged. When the open button 6 is pressed, the inner lid 7 is opened as shown in FIG. 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 section 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 XY device 11 are arranged. The X-Y device 11 is designed so that the position in the X direction and the Y direction can be specified by pressing the upper, lower, left, and right parts of the center. Note that, as such an XY device 11, a pointing device such as a trackball, a mouse, or a joystick can be used. Further above the inner cover 7, an outer cover 12 is rotatably disposed. This outer lid 12 can be opened by hand. This outer lid 12 can be opened at an opening/closing angle of 90 degrees or more, and can be fixed at a predetermined opening/closing angle θ. For example, 4
An inch-sized LCD display 13 is provided. When the outer cover 12 is opened, the LCD display 13 is exposed as shown in the figure, and the screen of the LCD display 13 can be viewed. Furthermore, an LCD drive switch 14 is provided on the back surface 12a of the outer cover 12. By operating this LCD drive switch 14, the LCD display 13
can be turned on/off.

Furthermore, as shown in FIG.
A CD display 13c is provided on the front surface of the outer lid 12. As shown in FIG. 5, when the LCD display 13 is not required, that is, when playing a CD-DA or when playing a CD
- When playing the CD-DA area of an I/CD-DA disc, close the lid 12 toward you and use it in the same way as a commonly used portable compact disc playback device. Can be done. In addition, as shown by broken lines in FIG. 5, this CD-DA LCD
A display 13c may be provided on the surface 12b (indicated by 13c' in the figure) of the outer lid 12, and this LCD
Place the display 13c on the side of the outer lid 12 (13 in the figure).
c”).

Now, in the CD-I player in this example, the disk 15 is a CD-I disk, a CD-I/C
It is possible to play D-DA discs (discs containing a mixture of CD-I discs and CD-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
98 (number of frames) = 2352 bytes. CD-I
The total recording capacity of a disk is approximately 640 MB for a disk with a diameter of 12 mm. 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. Note that mode 1 in a CD-ROM is one in which an error detection code and an error correction code are added to one block of data to enable powerful error correction. Furthermore, mode 2 in the CD-ROM is such that no error detection code or error correction code is added and a large amount of user data can be taken.

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. CD
The -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. 6A 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, which includes an error detection code EDC (4 bytes), P parity (172 bytes) for error correction, and Q parity (1
04 bytes) is 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. 6B 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 consists of the file number (2 bytes), channel number (2 bytes), submode (2 bytes), and data type (2 bytes), as shown in Figure 7. configured.

Now, 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 one other 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, analog discs, i.e. LP
It can be played with record-like sound quality. 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, you can play back with sound quality comparable to FM broadcasting. 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, A is used as the recording method.
DPCM is used. 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.

Next, image data will be explained. 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. 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), 1
There are 3 modes with 6 colors (4 bits), and you can select and use the color you need from 16 million colors.

[0020] 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. Next, to explain about the disk, C
For D-I disks, mechanical dimensions such as outer diameter dimensions, center hole dimensions, 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; The usage environment and other conditions are all similar to those of a normal compact disc for music (CD-DA).

[0021] Then, whether or not it is a CD-I disc is determined by checking the TOC (Table
Of Contents). That is, CD-I disc or CD-
In the I/CD-DA disc, PSEC is set to "10" when (POINT=A0). On the other hand, in other disks, PSEC is set to "00" when (POINT=A0). Therefore, (POINT=A0)
From PSEC at the time of CD-I disc or CD-I
/You can determine whether the disc is a CD-DA disc or another disc. Then, on the CD-I disc (POINT=A0, A1
, A2) is set to (01×0). CD-I/CD-DA disc (POINT
=A0) control field is always (01×0
), and other control fields are (00x0)
It is said that Therefore, from the control field, CD
-I disk or CD-I/CD-DA disk can be determined.

Now, since CD-I includes audio data and requires high-speed processing in real time, processing is performed using machine language. The CPU for this purpose is the 68-bit CPU developed by Motorola.
000 series is specified. Furthermore, the CD-RTOS (real-time operating system) that handles various files is based on OS9, and its programs are incorporated into the system using ROM. As input devices, at least two trigger buttons and an XY device are prepared. There are also two output systems: audio and video. The CD-I player is designed to play music CD-DA.

FIG. 1 shows the internal configuration of the CD-I player of this example. In FIG. 1, a disk 15 is similarly 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 2.
It is played in 3. 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 . This system controller 20 has an internal sub-CPU and an LCD (described later).
Controls the controller 13a. LCD controller 13a Under the control of system controller 20, LCD
The display 13b displays the number of songs, which will be described later, and the number of the song currently being played. In the focus/tracking servo circuit 25, based on the output of the photodetector,
Servo is applied to the optical head 25 in two axes: the focusing direction and the tracking direction. 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
The output of system controller 20 is supplied. 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 is composed of a bit clock reproducing circuit and the like. 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. CD
The output of the 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.

The system controller 20 receives input from an input device 30 . The input device 30 consists of two trigger buttons 10a and 10b and an XY device 11. 31 is a CP for controlling the CD-I system
It is U. As the CPU 31, a 68000 series CPU is used. The CPU 31 includes a master controller 3.
2 is connected. Further, the CPU 31 and the system controller 20 are bidirectionally connected. A bus 33 is derived from the CPU 31. Note that the CPU 31 and the master controller 32 may be integrated into one chip. The data reproduced by the CD-ROM reproduction circuit is sent to the bus 33. The bus 33 includes a video controller 3.
RAMs 35a and 35b are connected via 4a and 34b, respectively. The bus 33 also includes a system ROM 36.
, a backup non-volatile RAM 37 are bidirectionally connected. The bus 33 also includes an audio decoder 38.
is connected.

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. This 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 LCD display 13 via the LCD circuit 40. Further, the drive of this LCD display 13 can be turned on/off by an LCD 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 DA 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.

Next, the operation will be explained. Figure 8 shows the LC
This shows the operation when the D display 13 is turned on. First, in step 51, when the power is turned on using the power on/off switch 5 (see FIG. 1), it is determined whether the calendar and internal clock are to be set.
If “YES”, the process moves to step 52; if “NO”, the process moves to step 53. In step 52, X-
The calendar and internal clock are set by operating the Y device and trigger buttons 10a and 10b. Then, the process moves to step 53. In step 53, it is determined whether or not the disk 15 has been installed. If "YES", the process moves to step 56, and if "NO", the process moves to step 54.
to move to. In step 54, when the disk 15 is not installed, the LCD display 1 is displayed as shown in FIG. 9A.
In the display area 45 of No. 3, a display indicating that a disc is not loaded is displayed, and in the display area 46, a calendar and time are displayed. Then, the process moves to step 55.

In step 55, it is determined whether or not the disk 15 is mounted. If ``YES'', the process moves to step 56. In step 56, the TOC on the innermost circumference of the disk 15 is accessed. and step 57
to move to. In step 57, first, from the TOC data, a CD-I/CD-DA disc or a CD-
It is determined whether the disc is an I disc or a CD-DA disc. That is, for a CD-I disc or a CD-I/CD-DA disc, PSEC when (POINT=A0) is “
10”, and for other discs, (POINT=A0
), PSEC is set to “00”, so (P
From PSEC when OINT=A0), CD-I disc, CD-I/CD-DA disc, or CD-D
It is determined whether it is the A disk.

At step 58, a message is displayed on the LCD display 13 indicating that a CD-DA disc is loaded. That is, as shown in FIG. 9B, a display indicating disc loading is displayed in the display area 45 of the LCD display 13, and a PL for operating the CD-DA is displayed in the display area 46.
Operation keys such as AY, AMS, and STOP are displayed. Then, the process moves to subroutine S1, where reproduction is performed. If it is determined in step 57 that the disc is not a CD-DA disc, the process moves to step 60. In step 60, it is determined whether the disc is a CD-I disc or a CD-I/CD-DA disc. That is, (POINT=A0, A1,
The control field of A2) is (01x0), and the (POINT=A0) of the CD-I/CD-DA disc
) control field is always set to (01x0), and other control fields are set to (00x0), so it can be determined from this control field whether it is a CD-I disc or a CD-I/CD-DA disc. be done. Then, the process moves to step 61.

In step 61, a message is displayed on the LCD display 13 indicating that a CD-I disc is loaded. That is, when a CD-I disc is loaded, the LCD display 13 is displayed as shown in FIG. 10C.
In the display area 45, a display indicating that a disc is installed is displayed, and in the display area 47, the title of the application software and the like are displayed. Then, the process moves to subroutine S1, where reproduction is performed. Now, in step 60, the CD
- When it is determined that the loaded disk 15 is not a CD-I/CD-DA disk, it is determined that the loaded disk 15 is a CD-I/CD-DA disk, and the process moves to step 63. When a disc is installed, the LCD display 1 is displayed as shown in FIG. 10D.
A display indicating that the disc is installed is displayed in the display area 45 of No. 3,
PLAY for operating the CD-DA in the display area 46;
Operation keys such as AMS and STOP are displayed, and the title of the application software is displayed in the display area 47. Then, the process moves to step 64.

In step 64, the user operates the XY device 11 and the trigger buttons 10a and 10b, and selects playback according to this operation. and step 65
to move to. In step 65, it is determined whether or not CD-DA playback has been selected. If "YES", the process moves to subroutine S1, and if "NO", the process moves to step 67. In step 67, when the user operates the XY device 11 and the trigger buttons 10a and 10b according to instructions from the application software, the CD-I/CD-DA is played back in response to this operation.

In this way, in this example, CD-I/CD-
In the case of a DA disc, only the CD-DA area can be played back, so that only the sound of the application software can be enjoyed.

Now, the above-mentioned subroutine S1 will be explained with reference to FIG. This subroutine S1
The program may be recorded in advance on the disk 15 or may be stored in the system ROM 36 of the player main unit 2. First, in step 70, the disk 15
Based on the TOC data, it is determined whether or not there is a CD-DA track on the disk 15. If ``YES'', the process moves to step 71, and if ``NO'', this subroutine S1 is exited. In step 71, the sub CPU in the system controller 20 controls the LCD controller 1.
3a is controlled, and a display information signal is supplied to this LCD controller 13a by this sub CPU. Then, as shown in FIG. 11, the LCD display 1
The number of songs is displayed on the right side of the display screen a of the LCD display 13b (see FIG. 1), and the number of songs is displayed on the display surface b of the LCD display 13b.
TOP, PLAY/PAUSU, AMS, etc. are displayed. Then, the process moves to step 72. In step 72, it is determined whether or not to play the CD-DA.
If the answer is "S", the process moves to step 73, and if the answer is "NO", the process exits from this subroutine S1. In step 73, a song to be played is selected. That is, when the user selects a song by operating the trigger buttons 10a, 10b and the XY device 11, the track of the song having the selected song number is accessed according to this operation. Furthermore, when there is no song selection operation, the song with the number next to the song number of the previously played song is accessed. Then, the process moves to step 74. In step 74, as shown in FIG. 11, the number of the selected song is displayed on the left side of the display surface a of the LCD display 13b (in this example, it is "1"). Then, the process moves to step 75. In step 75, step 73
The data of the selected song is played back. In step 76, it is determined whether or not the playback is finished, and "YE
S'', the process returns to step 72. After moving to step 72 again, the signals for each block are counted, for example, and the song number of the song currently being played is displayed as shown in FIG. The end is performed, for example, by receiving information indicating the end of recording.

In the above example, the number of songs, operation keys, etc. are displayed on the LCD display 13b under the control of the sub CPU of the system controller 20. etc., under the control of the CPU 31, information on the song selection operation is first supplied to the CPU 31, which causes the CPU 31 to control the video controller 34a or 34b.
Display data may be written in the RAM 35a via the video synthesizer 39 and the LCD circuit 40, and the written image data may be supplied to the LCD display 13 via the video synthesizer 39 and the LCD circuit 40. In this case, “CD
-DA TRACK 01", the song number or the song number of the song currently being played may be displayed. In addition, such information can be displayed on the LCD display 1.
3 and LCD display 13b,
LCD display 13 or LCD display 13
It may also be displayed only in b.

As is clear from the above, when there is a CD-DA track on the disc 15, the number of tracks existing on this CD-DA is displayed, and during playback, the track currently being played is displayed. Number on LCD display 13 or L
Since it is displayed on the CD display 13b, the user can recognize the song number of the song currently being played. Also, for example, the LCD display 13 is relatively large, but the LCD display 13b is quite small compared to this, so if, for example, only the LCD display 13b is used when playing a CD-DA and the LCD display 13 is turned off, it can be made smaller. LCD display 13b
It is possible to avoid wasting power by the amount of electricity used. It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

[0037]

According to the present invention described above, when playing back song information from a disc, at least the song number of the song information currently being played is displayed on the display section. There is an advantage in being able to recognize the number of a song.

[Brief explanation of the drawing]

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

FIG. 2 is a flowchart for explaining an example of the disc playback device of the present invention.

FIG. 3 is a perspective view showing an example of the disc playback device of the present invention.

FIG. 4 is a perspective view showing an example of the disc playback device of the present invention.

FIG. 5 is a perspective view showing an example of a disc playback device of the present invention.

FIG. 6 is a diagram showing Form 1 for explaining an example of the disc playback device of the present invention.

FIG. 7 is a diagram showing a subheader for explaining an example of the disc playback device of the present invention.

FIG. 8 is a flowchart for explaining an example of the disc playback device of the present invention.

FIG. 9 is a diagram showing a display state when a disc is not inserted and when a CD-DA disc is inserted, for explaining an example of the disc reproducing apparatus of the present invention.

FIG. 10 is a diagram illustrating a display state when a CD-I disc and a CD-I/CD-DA disc are inserted to explain an example of the disc reproducing apparatus of the present invention.

FIG. 11 is a diagram showing a display state of an LCD display for a CD-DA disc to explain an example of the disc playback device of the present invention.

[Explanation of symbols]

1 CD-I player 13 LCD display 13c LCD display 15 Disc 20 System controller 23 Optical pickup 28 CD playback circuit 29 CD-ROM playback circuit 31 CPU

Claims (1)

[Claims] [Claim 1] A disc playback device that plays back a disc on which image information and the like are recorded in addition to audio information,
It has a disc playback unit that plays back the disc, and a display unit that displays the playback output obtained by playing back information recorded on the disc by the disc playback unit, and when playing back song information from the disc, the display unit displays the display unit. 1. A disc playback device characterized in that at least a song number of song information being played back is displayed in the section.