JP2981365B2 - Magneto-optical disk recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disc recording / reproducing apparatus for recording / reproducing a rewritable magneto-optical disc, a so-called mini disc, and more particularly to a display method using characters such as a disc title and a song title.

[0002]

2. Description of the Related Art A mini disk (MD), which is known as a rewritable magneto-optical disk, has a recordable area outside a pit information recording area on an inner peripheral side. The recordable area has a user's stock area (U-TOC) and a program area, where there are no pits, but instead a groove (groove) that guides the track.
Are dug, and information is recorded along this groove.

A groove undulates in a waveform, and the average frequency of a signal generated by the undulation (wobble) is 22.
The rotation of the disk is controlled to be 05 kHz.
Further, the absolute time (address information) from the recording start position is FM-modulated and recorded in the wobble.

[0004] Recording is performed by magnetization of a magnetic film. That is, the magnetic film is heated to a point above the Curie point by a laser spot, and a magnetic field that reverses according to a signal is applied thereto.
Upon cooling, a signal is recorded on the magnetic film as a change in magnetization direction. Such recording can also be performed on a part that has already been recorded. That is, overwriting (overwriting) is possible.

[0005] An arbitrary tune is recorded in the recordable area, and management information of each recorded tune is recorded in the U-TOC. In U-TOC, an address indicating the start and end time of each song is recorded in sector 0, in sector 1 the song title is recorded in ASCII code, and in sector 4 the song title is shifted JIS code or ISO-8859-1 code. Recorded in.

[0006] In addition to the rewritable mini-disc, a so-called recordable mini-disc, there is a pre-mastered mini-disc in which the same pit information is recorded in all areas as the recordable mini-disc. In the premastered mini-disc, management information of each music piece is recorded in the inner TOC. In the TOC, an address indicating the start and end time of each song is recorded in sector 0, in sector 1 the disc title and song title are recorded in ASCII code, and in sector 4 the disc title and song title are shifted JIS code or It is recorded in ISO-8859-1 code.

Conventionally, in a magneto-optical disk recording / reproducing apparatus for recording or reproducing such a recordable mini-disc and a pre-mastered mini-disc, a character is recorded in sector 1 of the TOC or U-TOC on the disc.
If the data is recorded, the character in the sector 1 is displayed, and then the address is automatically switched to the time display mode in which the address is converted into time and displayed.

When characters in other sectors are displayed, the display mode is switched by pressing a display switching key. However, sector 4 is in shift J
Since the data is recorded in the IS code or the ISO-8859-1 code, the display and the display circuit of these characters become large, so that the display of the sector 4 is not supported.

[0009]

In the above-described conventional magneto-optical disk recording / reproducing apparatus, even if a character of a desired sector is displayed by pressing a display switching key to display the character of that sector, the disk is replaced or the power supply is not changed. When the switch is turned off, the display mode is cleared and the display mode must be changed again by the display switching key, which is inconvenient.

The character recorded in the sector 4 is capable of displaying a plurality of languages, and is used by the user.
There is a demand to preferentially view the character recorded in.

The present invention has been made in view of the above points, and has as its object to provide a magneto-optical disk for displaying character data recorded in sector 4 with priority over other sectors. An object of the present invention is to provide a recording and reproducing device.

[0012]

According to the magneto-optical disk recording and reproducing apparatus of the present invention, character data is recorded in either sector 1 or sector 4 in the TOC or sector 1 or sector 4 in the U-TOC. When a disc is reproduced, character data recorded in sector 4 is displayed before character data recorded in sector 1.

In the magneto-optical disk recording / reproducing apparatus, when character data to be displayed in sector 4 is not recorded, character data of sector 1 is displayed.

[0014]

According to the magneto-optical disk recording / reproducing apparatus of the present invention, the sector 1 or the sector 4 or the U
When reproducing a disc in which character data is recorded in either sector 1 or sector 4 in the TOC, the character data recorded in sector 4 is smaller than the character data recorded in sector 1 Since it is displayed first, the display of its own language of each country is performed first, which makes it easy for the user to understand.

[0015]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an MD recording / reproducing apparatus according to an embodiment of the present invention. In the figure, 1 is an MD disk. The MD disk 1 is rotated by a disk motor 2, and is recorded so as to be overwritable by spot heating by an optical pickup 3 and a modulation magnetic field applied by a magnetic field modulation head 4.

The MD disk 1 reflects a laser beam emitted from the optical pickup 3, and the reflected light is received by the optical pickup 3 to reproduce a recording signal. Reference numeral 5 denotes a recording / playback signal processing unit. At the time of recording, the recording signal applied to the recording input terminal 8 is supplied to the recording / reproduction signal processing unit 5 after being converted into a digital signal by the A / D converter 6, and the recording / reproduction signal processing unit 5 modulates the signal. Then, a modulation signal is applied to the magnetic field modulation head 4 by signal processing.

At the time of reproduction, the recording / reproduction signal processing unit 5
The reproduction signal read from the D disk 1 is demodulated and subjected to signal processing, and output to the D / A converter 7. The D / A converter 7 converts the input signal into an analog signal and outputs it to an audio amplifier. Further, the recording / reproducing signal processing unit 5 performs servo control on the disk motor 2 and the optical pickup 3 via a servo circuit (not shown).

Reference numeral 9 denotes a system controller. The system controller 9 includes a microcomputer having a ROM, a RAM, and an input / output interface, and operates according to a program written in the ROM.
Further, necessary external data is fetched and decoded from the connected key operation unit 10 and display unit 11, and RAM
Is used as a work memory to perform arithmetic processing, and output processing data to a recording / reproducing signal processing unit or the like as necessary to control recording / reproducing operations.

The key operation unit 10 is used to operate the apparatus. In addition to the normal play key, recording key, stop key,
SCII code, shift JIS code, ISO-885
There are priority display keys for each of the 9-1 codes, and only one of these priority display keys can be held in a depressed state. The display unit 11 displays a character according to a command from the system controller 9.

Next, the character display operation of this device will be described with reference to FIG. The character display operation is performed in a state where TOC and U-TOC data are read from the disk and stored in the RAM.

First, in steps S1, S2, and S3, it is determined whether or not the display is in the priority display state. If the display is the priority display of the ASCII code, the ASCII code is decoded when there is data other than 0 in the sector 1. (S16), and then a time conversion display (S17) is performed. In other cases, the time conversion display is performed without displaying the song name or the like. (S1, S4, S15, S17) In the case of the priority display of the shift JIS code or the ISO-8859-1 code, the character of the code of the priority display is displayed only when there is a code other than 0, and in other cases, Time conversion display is performed without displaying a song name or the like. (S2, S5, S7, S8, S9, S3, S6, S
10, S11, S12, S17) If priority display is not specified, it is first determined in step S13 whether or not sector 4 is used. If sector 4 is used, shift JIS code or ISO-885
When there is data other than 0 in the 9-1 code, the character is displayed, and in other cases, time conversion display is performed without displaying a song name or the like. (S14, S8, S9, S1
0, S11, S12, S17) When priority display is not specified and sector 4 is not used, when there is non-zero data in sector 1, its ASCII code is decoded and displayed, and in other cases Is displayed in time conversion without displaying the song name or the like. (S15, S1
6, S17) An example of such a display is shown in FIG. When priority display is not specified in this way,
Since the shift JIS code is displayed with priority, the display is easy for Japanese to understand.

The operation of displaying the disc title immediately after loading the disc or displaying the title of the tune before playing each tune has been described. However, after the disc is loaded, if the reproduction is not instructed by the key operation unit 10 after the disc is loaded, the system controller 9 executes the disc display. After displaying the title, stop
If reproduction is instructed, the song name is displayed at the start of each song, and then time conversion display is performed.

The system controller 9 uses the display mode switching key of the key operation unit 10 to display the contents of the displayed time, the title of the sector 1, the title of the sector 4, and the recording date of the sector 2. Perform as needed.

The embodiment is configured as described above.
The invention is not limited to this. For example, an operation key for designating the display order may be provided instead of the priority display key.

[0025]

According to the magneto-optical disk recording / reproducing apparatus of the present invention, for example, when a Japanese music MD is reproduced in Japan, the title is automatically displayed in Japanese (shift JIS code). The display of katakana (shift JIS code) is also performed on Western MD, so that the display is easy to understand.

When there is no katakana and there is a record of the alphabet (ASCII code) of sector 1, it is displayed, so that it is easy to use.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an MD recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a character display operation of the MD recording / reproducing apparatus.

FIG. 3 is a diagram showing a display example of a display unit of the MD recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 MD disk 2 Disk motor 3 Optical pick-up 4 Magnetic field modulation head 5 Recording / reproduction signal processing part 6 A / D converter 7 D / A converter 8 Recording input terminal 9 System controller 10 Key operation part 11 Display part

Claims (2)

(57) [Claims] 1. Sector 1 or sector 4 in the TOC
Alternatively, the character data recorded in sector 4 is replaced with the character data recorded in sector 1 when a disk having character data recorded in either sector 1 or sector 4 in the U-TOC is reproduced. A magneto-optical disk recording / reproducing device characterized in that the display is performed earlier than the display. 2. The magneto-optical disk recording / reproducing apparatus according to claim 1, wherein when character data to be displayed in sector 4 is not recorded, character data in sector 1 is not recorded.
A magneto-optical disk recording / reproducing device configured to display data.