JPH05325515A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To automatically display a disk name, track information or the like by reading title information from a disk where the title information is recorded, storing it in a memory, and reading it from the memory based on an access command. CONSTITUTION:TOC information disposed in the most inner periphery of the disk 11B in a mini-disk 11 is stored in a part of a DRAM 25 at the time of first access of loading the disk. When a user TOC is updated, the user TOC on the DRAM 25 is updated and stored in the dish. In such a mini-disk, the disk name and track name can be stored in the TOC. The TOC information stored in the DRAM 25 at the time of loading disk is read through a memory controller 24. Then, when the disk name or the track name are stored, the names are displayed on a display 9, then when no names are stored, the total number of musics, the total play time and the music number are displayed. Consequently, when a desired music is selected, the information of reproduced music is obvious at a glance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing device suitable for use as a mini disc reproducing device for reproducing an optical disc or a magneto-optical disc having a diameter of 64 mm contained in a cartridge.

[0002]

2. Description of the Related Art 64 mm diameter stored in a cartridge
Mini disc (MD) systems for recording / reproducing digital audio signals using the optical discs or magneto-optical discs have been developed. In the mini disc, a digital audio signal is compressed to about 1/5 and recorded by using a voice compression technique. As a result, it is possible to record / reproduce an audio signal having a high sound quality of about 74 minutes on a disc having a small diameter of 64 mm.

In a mini disk recording / reproducing apparatus,
At the time of data recording, it is necessary to control the laser power, and the interleaving length of CIRC is 108 frames, which is longer than the length of one sector. Therefore, a linking area is required. For this reason, recording / reproduction is performed on the mini disk in units of clusters each including 36 sectors. Of the 36-sector cluster, data is recorded in 32 sectors. The remaining 4 sectors are
Used for linking and sub data.

During reproduction, data is reproduced from the optical disc at a transfer rate higher than that of a decoder that decompresses the data. This reproduction data is once stored in the buffer memory. The buffer memory is filled with digital signals in about 0.9 seconds. Even if the digital signal on the disk cannot be read due to vibration or the like, the reproduced signal continues to be output for about 3 seconds due to the data stored in the buffer memory. By re-accessing the optical pickup to the original position and reading the signal again during that time, it is possible to prevent so-called sound skipping. This buffer memory is
It is called a shock proof memory.

On such a mini disc, a disc name and a track name for referring to the names of the disc and the track can be recorded. It is desired that the disc name or the track name is positively used for the disc on which the disc name or the track name is recorded.

[0006]

Disc names and track names are usually displayed by key operation. However, if the disc name and the track name are displayed by such a key operation, the user may not use the disc name and the track name even though the disc name and the track name are recorded. Also, when the track name is displayed when selecting this song, information of the song to be played can be obtained at a glance.

Therefore, an object of the present invention is to provide a disc reproducing apparatus in which the disc name and the track name are automatically displayed in the case of the disc on which the disc name and the track name are recorded.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a disc reproducing apparatus for reproducing a disc in which a plurality of recorded program information are recorded and at least title information of each of the plurality of program information is recorded. A disc reproducing apparatus having memory means for storing title information read from a disc, reading title information corresponding to the access instruction from the memory means based on the access instruction from the control means, and displaying the title information on the display means. is there.

[0009]

The TOC information is stored in a part of the DRAM 25. When the desired song is selected, if there is a track name, the track name is automatically displayed on the display 9. From this track name, the information of the song to be played can be seen at a glance.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an entire mini disk recording / reproducing apparatus to which the present invention is applied.
In FIG. 1, a disc mounting tray 8 and a display 9 are arranged on the front panel 1A of the mini disc recording / reproducing apparatus 1. The front panel 1A of the mini disk recording / reproducing apparatus 1 is provided with a power key 2, an eject key 3, a reproducing key 4, a pause key 5, a stop key 6, AMS keys 7A and 7B, and a recording key 10. To be done.

By operating the eject key 3,
As indicated by the alternate long and short dash line, the disc mounting door tray 8 is pulled out. A mini disk (not shown) is placed on the disk mounting tray 8. When the disc mounting tray 8 is housed inside, a mini disc is loaded.

The display 9 displays time information such as the total playing time of the mounted mini-disc, the playing time of the music being played, the remaining playing time, and the track number of the playing music. In the case of a disc on which the disc name and the track name are recorded, the disc name and the track name are displayed on the display 9.

FIG. 2 shows the structure of a mini disk recording / reproducing apparatus to which the present invention is applied. In FIG. 2, 11 is a mini disk. The mini disk 11 is
An optical disk 11 with a diameter of 64 mm in the cartridge 11A
It is constructed by storing B. In this mini disk 11,
There are three types of discs: a read-only optical disc, a recordable magneto-optical disc, and a hybrid disc in which a read-only area and a recordable area are mixed.

The disk 11B of the mini disk 11 is rotated by the spindle motor 12. Mini disc 1
1 is provided with a shutter, and a mini disk 11
When is attached, the shutter is opened. In the case of a recordable optical disk, the recording magnetic head 13 is arranged facing the upper part of the disk 11B, and the optical pickup 14 is arranged facing the lower part of the disk 11B.

The rotation of the spindle motor 12 is controlled by the servo control circuit 15. Optical pit up 14
The movement of the disk 11B in the radial direction is controlled by the feed motor 16. Further, the servo control circuit 15 performs focus and tracking control.

The system controller 17 manages the entire operation. In this system controller 17,
Input is given from the key 18. The key 18 corresponds to the power key 2, the eject key 3, the play key 4, the pause key 5, the stop key 6, the AMS keys 7A and 7B, and the recording key 10 on the front panel 1A. Further, the display 9 displays the time information such as the total playing time of the mini-disc, the playing time of the song being played, and the remaining playing time, the track number of the song being played, the disc name and the track name. ..

At the time of recording, an audio signal is supplied to the input terminal 21. This audio signal is digitized by the A / D converter 22 in 16 bits. The sampling frequency at this time is 44.1 kHz.

This digital audio signal is supplied to the audio compression encoder / decoder 23. The audio compression encoder / decoder 23 compresses the audio signal to about 1/5. A modified DCT (Modified Discreate Cosine Transform) is used as an audio signal compression technique.

The audio signal compressed by the audio compression encoder / decoder 23 is temporarily stored in the DRAM 25 via the memory controller 24. DRAM25
Has a data capacity of 1 cluster or more (1 Mbit in this example). The output of this DRAM 25 is EF
It is supplied to the M / CIRC encoder / decoder 26.

The EFM / CIRC encoder / decoder 26 performs an error correction process on the recording data and performs EFM (8-14 modulation) on the error correction coded data. As an error correction code, CIRC (Cross I
nterleave Reed Solomon Code) is used.

The recording data thus formed is
It is supplied to the recording magnetic head 13 via the head drive circuit 27. As a result, the magnetic field modulated by the recorded data is the disk 11B (magneto-optical disk) of the mini disk 11.
Applied to. Further, the laser beam from the optical pickup 14 is applied to the disc 11B of the mini disc 11. As a result, the disc 11B of the mini disc 11
Data is recorded magneto-optically.

Data recording is performed in cluster units. One cluster has 36 sectors, and one sector (corresponding to one subcode block of a compact disc) has 98 frames. This is because, at the time of data recording, it is necessary to control the laser power, and the interleaving length of CIRC is 108 frames, which is longer than the length of one sector, so that a linking area is required. 1
Of the clusters (36 sectors), the first 3 sectors are linking sectors. The next one sector is for sub data. Therefore, compressed data is recorded in 32 sectors of one cluster (36 sectors).

The position on the disc at the time of recording is designated by the address wobble recorded in the groove provided along the track of the disc 11. The address recorded in the groove in the wobble is detected by the address decoder 28. The address detected by the address decoder 28 is the EFM / CIRC encoder /
It is supplied to the decoder 26.

At the time of reproduction, the recording signal of the disk 11B of the mini disk 11 is reproduced by the optical pickup 14.
The reproduction signal on the disk 11B is reproduced in cluster units. This reproduction signal is transmitted through the RF amplifier 29 to the EF.
It is supplied to the M and CIRC encoder / decoder 26. At this time, the optical pickup 14 reads the digital signal on the disk 11B at a transfer rate of 1.4 Mbit / sec. The digital signal from this disk 11 is
EFM and CIRC encoder / decoder 26 for EFM
It is demodulated and subjected to error correction processing.

The output of the EFM and CIRC encoder / decoder 26 is passed through the memory controller 24 to the DRA.
Once stored in M25. The output of the DRAM 25 is supplied to the audio compression encoder / decoder 23. The audio signal is expanded by the audio compression encoder / decoder 23.

The audio compression encoder / decoder 23
When data is obtained at 300 kbit / sec, it is possible to decompress and reproduce uninterrupted audio.
On the other hand, as described above, the optical pickup 14
Reads a digital signal on the disk 11B at a transfer rate of 1.4 Mbit / sec. 1M bit D
The RAM 25 is filled with the digital signal in about 0.9 seconds, and if the digital signal on the disk 11B cannot be read due to vibration or the like, the DRAM 2 remains in the DRAM 2 for about 3 seconds.
The reproduced signal can be continuously output by the data stored in 5. In the meantime, by re-accessing the optical pickup 14 to the original position and reading the signal again,
It is possible to prevent so-called sound skipping.

The data decompressed by the audio compression encoder / decoder 23 is supplied to the D / A converter 30 and returned to an analog signal. This analog audio signal is output from the output terminal 31.

A TOC (Table Of Contentes) is provided on the innermost periphery of the disc 11B of the mini disc 11. In this TOC, information on what kind of data is recorded where on the disc 11B is recorded. Figure 3
Shows the structure of TOC. The TOC consists of a header area and a data area. The head of the header area is a fixed sync pattern area A1, followed by header information area A2 indicating clusters and sectors.

A fixed pattern area A3 is provided at the beginning of the data area, and an identifier indicating that the disk is a mini disk, disk type (reproduction-only, recordable, reproduction-only area and recordable area are mixed), recording An area A4 of identification information such as power, first track number, last track number, lead-out start address, used sector, power calibration start address, user TOC start address, and recordable user area start address is provided. Following this, track number points (P-
Areas A5 of TNO1, P-TNO2, P-TNO3, ...) Are provided. This track number point (P-
TNO1, P-TNO2, P-TNO3, ...) are pointers indicating the address of the information of the start address and end address of the track number. Following this,
An area A6 for track information is provided. In the track information area A6, information on the start address and end address of each track is recorded. The address of the information of the start address and the end address of each track is track number points (P-TNO1, P-TNO2, P-
TNO3, ...).

Further, the mini disk 11 is provided with a user TOC for managing the recorded audio signal. FIG. 4 shows the structure of the user TOC.
The user TOC has the same basic structure as the TOC described above. For the user TOC, the information of each track is linked to
-P (indicated by B1) information is included. This Li
nk-P indicates which track follows next. Therefore, it is not necessary to change the track order to change the song order. Track information management is
It can be done on the user TOC.

These TOC information are stored in a part of the DRAM 25 at the first access when the disc is mounted. When updating the user TOC, this DR
The user TOC is updated on the AM 25, and the updated user TOC is recorded on the disc at the time of ejection, for example.

In such a mini disc, the TO
The disc name and track name can be recorded in C. FIG. 5 shows the TOC in which the disc name and the track name are recorded. As shown in FIG. 5, the disc name and the track name are recorded in the area A5.

In an embodiment of the present invention, in the case of a disc on which such disc name or track name is recorded, the disc name or track name is automatically displayed. Therefore, the disc name and the track name can be effectively used.

FIG. 6 is a flowchart showing the processing for automatically displaying the disc name. When the disc is loaded, the TOC recorded on the disc is read,
This TOC information is stored in a part of the DRAM 25. This TOC information is read (step 51),
The presence / absence of a disc name is determined from the TOC information (step 52). If the disc name is recorded, the disc name is displayed on the display 9 (step 53). If the disc name is not recorded, the total number of songs and total playing time are displayed on the display 9 (step 54).

FIG. 7 is a flowchart for automatically displaying the track name. The TOC recorded on the disc is read when the disc is loaded.
Information is stored in a part of the DRAM 25. When a song number is selected by the AMS keys 7A and 7B (step 6)
1) It is determined whether or not there is a track name (step 6)
2). If there is a track name, the track name is displayed on the display 9 (step 63). If there is no track name, the song number is displayed on the display 9 (step 64).

FIG. 8 and FIG. 9 are examples of the display displayed on the display 9 when the music number is selected. Display 9
Has a character character display area 71 and a number display area 72. If there is a track name, the character character display area 71 displays the track name.

FIG. 8 shows the display on the display 9 while the reproduction of the disc is stopped. As shown in FIG. 8, when there is a track name, the track name is displayed in the character display area 71, and in the number display area 72, the number of songs that can be played while the disc playback is stopped is displayed. The number is displayed and the song number selected in that number flashes.

FIG. 9 shows a display on the display 9 during reproduction. As shown in FIG. 9, if there is a track name during playback, the track name is displayed in the character character display area 71 and the number display area 72 is displayed.
Indicates the number of the song that has not been played yet, and the song number of the song that is playing is flashed.

[0039]

According to the present invention, the TOC information is D
The track name is stored in a part of the RAM and, when a desired song is selected, if there is a track name, the track name is automatically displayed on the display 9. From this track name,
At a glance, you can see the information about the song to be played.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention as a whole.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a schematic diagram used to explain a TOC in one embodiment of the present invention.

FIG. 4 is a schematic diagram used for explaining a TOC in one embodiment of the present invention.

FIG. 5 is a schematic diagram used to explain a TOC in one embodiment of the present invention.

FIG. 6 is a flowchart used to describe an embodiment of the present invention.

FIG. 7 is a flow chart used for explaining one embodiment of the present invention.

FIG. 8 is a schematic diagram used to describe an embodiment of the present invention.

FIG. 9 is a schematic diagram used to describe an embodiment of the present invention.

[Explanation of symbols]

 1 Mini-disc recording / reproducing device 9 Display 23 Audio compression encoder / decoder 25 DRAM

Claims (2)

[Claims] 1. Title information read from a disc in a disc reproducing apparatus for reproducing a disc on which a plurality of recorded program information is recorded and at least title information of each of the plurality of program information is recorded. And having a memory means for storing, read title information corresponding to the access command from the memory means based on the access command from the control means,
A disk reproducing device adapted to display on a display means. 2. The number information corresponding to the program information is recorded on the disc, and the number information is displayed together with the title information on the display means based on the access command. Disc player.