JPH06325547A - Recorder/reproducer - Google Patents

Abstract

PURPOSE:To allow the device to selectively takeout only required information by providing the character information recorded on a recording medium additionally with specific character information representative of the period of character information to subdivide the character information thereby making the relevant information, as well as the melody, recordable. CONSTITUTION:A signal to be recorded is fed from an input terminal 1 through an A/D converter 2 to an ATRAC processor 3 where the digital signal is compressed. The compressed signal is then interleaved through a signal processor 4 and added with an error correction code. It is then subjected to time control through a memory circuit 6 and recorded through an RF recording amplifier 5 while taking account of the subcode information, e.g. address information to be recorded, produced by a control circuit 18. When a text data is recorded, a specific code representative of a period of the data is recorded thus subdividing the text data. When any one of eight codes, i.e., '5Bh'-'5Dh' and '7Bh'-'7Fh' of ASCII code, not used in MD system for sector 01Hm for example, is used as the additional code, eight types of text can be recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called MD (mini disk) system for performing magneto-optical recording and reproduction of an audio signal as a digital signal on a disk-shaped recording medium.

[0002]

2. Description of the Related Art The MD system is, for example, "Electronic Life" (published by Japan Broadcasting Corporation), 1992.
As described in No. 2, pages 11 to 68,
An audio signal is recorded on a rewritable magneto-optical disk by a digital method, and the digitized audio signal is an ATRAC (Adaptiv) signal.
e Transform Acoustic Codi
ng), data is compressed by a high-efficiency encoding process, and magneto-optically recorded on the magneto-optical disk.

[0003]

In the MD system, the audio signal is converted into a digital signal and recorded, and the disc name and the track title are used as text information, together with other subcode signals, in a specific recording area ( U
In the TOC area, ASCII characters (sector 01H) and Chinese characters by shift JIS code (sector 04H) are recorded. The song name of track n is recorded at the address indicated by the P-TNon pointer, and the minimum unit is 7 bytes.
In the case of 7 bytes or more, this is linked by information called "Link-P".

However, in this text information recording method, even if not only the song name but also the artist name, performer name, etc. are recorded for each track, it is not possible to individually extract the character information, and these There is a problem that the character information is treated as a series of character information data.

[0005]

In order to solve the above-mentioned problems, according to the present invention, an information signal such as a voice signal is converted into a digital signal and recorded on a recording medium, and the digital signal recorded on the recording medium is also recorded. Is a recording / reproducing apparatus which converts the information into an original information signal and reproduces the same, wherein in the recording / reproducing apparatus capable of recording character information in a specific area on a recording medium in addition to the information signal, the character information is included in the character information. It is intended to provide a recording / reproducing apparatus for subdividing the character information by adding specific character information representing the delimiter.

Further, the specific character information representing the delimiter of the character information is ASCII code "5Bh" to "5D".
At least one of the eight codes "h" and "7Bh" to "7Fh" is used.

Further, the specific character information representing the delimiter of the character information is recorded in the sector 01H of the UTOC of the magneto-optical disk in the MD system.

[0008]

With the above-described structure, if specific character information representing a delimiter of the character information is recorded in advance, each part of the character information subdivided by the specific character information can be independently read. You can

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 1 is an input terminal for receiving an analog information signal such as an audio signal, 2 is an A / D conversion circuit for converting the input information signal into a digital signal, and 3 is the A / D conversion circuit 2. An ATRAC processing circuit 4 for compressing an output information signal and converting it into a high-efficiency coded digital signal interleaves the digital signal output by the ATRAC processing circuit 3, adds an error correction code, and further adds a subcode signal. The digital signal processing circuit 5 for converting into a digital signal is a recording RF amplifier, and the output signal from the digital signal processing circuit 4 is converted into a signal for recording on the magneto-optical disk 9 by the recording magnetic head 7. To do.

Reference numeral 6 is a memory circuit for shock proof (for preventing skipping due to vibration etc.) for temporarily storing a compressed digital signal, and 8 is for MD for heating the disk surface to the Curie temperature during recording and reading the pit signal during reproduction. It is a laser pickup. Reference numeral 10 denotes an ADIP demodulation circuit incorporating a reproduction RF amplifier that amplifies the signal read from the laser pickup 8 during reproduction, and 11 performs processing such as error correction based on the signal from the reproduction RF amplifier in the ADIP demodulation circuit 10. A digital signal processing circuit, 12 is an ATRAC processing circuit that expands the signal processed by the digital signal processing circuit 11 and restores the original digital signal, and 13 is a D / A conversion circuit that converts this digital signal into the original analog signal. , 14 are output terminals for demodulated analog signals.

Further, 15 is a spindle motor, 16 is a sled motor, 17 is a motor control circuit for controlling the spindle motor 15 and the sled motor 16,
Reference numeral 18 denotes a control circuit that controls the entire device.
Controls the motor control circuit 17 of the spindle motor 15 and the sled motor 16, controls the mechanism and the like and processes the subcode data according to the information from the key input terminal 19, the mechanical switch input terminal 20, etc. , Digital signal processing circuit 4,
Memory circuit 6, digital signal processing circuit 11, ATRAC
Control the circuit 12.

The operation of the MD system shown in FIG. 1 will be described next. The control circuit 18 is composed of a system controller using a microcomputer, and has a key input terminal 19 and a mechanical switch input terminal 2
When the magneto-optical disk 9 is set to the recording mode by the operation key signal of 0 and the mechanism detection signal, the laser pickup 8 emits light under the control of the control circuit 18, and the reflective surface of the magneto-optical disk 9 is focused. Focus is applied on the disc surface.

In the magneto-optical disk 9 to be recorded, a spiral groove is formed in the recording area and undulating waviness is applied at the sampling frequency (Fs = 44.1 kHz).
An IP (Adress InPregroove) signal is demodulated. At this time, the spindle motor 15 is rotated to move the EFM (Eight to Fourteen M
adjustment) signal or ADIP signal to perform spindle servo. A tracking servo and a sled servo are also applied by the sub beam of the laser pickup 8. Further, based on the ADIP address, the disk surface is heated to the Curie temperature by the laser pickup 8 and recorded by the magnetic head 7.

As for the signal to be recorded, the signal input from the input terminal 1 is converted into a digital signal by the A / D conversion circuit 2 and further compressed by the ATRAC processing circuit 3 to perform digital signal processing. The circuit 4 interleaves, adds an error correction code, performs time control in the memory circuit 6, adds subcode information such as address information to be recorded generated in the control circuit 18, and sends it to the RF recording amplifier 5. Will be recorded.

When the system is set to the reproducing mode, the laser pickup 8 emits light under the control of the control circuit 18 as well, so that the reflecting surface of the magneto-optical disk 9 is focused and the disk surface is focused. Further, the spindle motor 15 is rotated and the spindle servo is applied by the EFM signal. At this time, tracking servo and sled servo are also applied by the sub beam of the laser pickup 8. Then, the signal recorded by the laser pickup 8 is read and sent to the ADIP demodulation circuit 10 and sent to the digital signal processing circuit 11 for error correction,
Processing such as deinterleaving is performed, time control is performed using the memory circuit 6, the original digital signal is expanded by the ATRAC processing circuit 12, the original analog signal is converted by the D / A conversion circuit 13, and the output terminal 14 Output more.

The magneto-optical disk 9 is, as shown in FIG.
There is a lead-in area 21 where data is recorded in the same pit as the CD-DA, and a recordable spiral groove.
Web-shaped UTOC area 22, recordable area 23, lead-out area 2
Data management is performed by clusters, sectors, and sound groups.

As shown in FIG. 3, the address has 36 sectors as one cluster, sectors 00H to 1FH as main data, sectors FCH to FFH are all sub data in the pit portion, and only FFH is sub data in the groove. And the remaining FCH to FEH are linked. Also, set the address at the beginning of the UTOC area to 00
00H: FCH (cluster: sector).
Therefore, the last address is FFF in the lead-in area.
FH: 1FH (cluster: sector), and the number of clusters decreases toward the inner circumference. TOC in the lead-in area
Information is repeatedly recorded, and it is obliged to record the sector 00H (mainly address information is recorded) in the clusters 0003H to 0005H in the UTOC area without fail after recording the UTOC information.

Further, as an option, sector 01H
The disc name and the song name are recorded in Sector 02H, and the disc recording date and time and the song recording date and time are recorded in Sector 02H.
The disc name such as kanji and the song name are recorded in.

Next, FIG. 4 shows a general UTOC sector 0.
1 shows a schematic view of 1H. This UTOC sector 01
H is an area for recording a disc name and a track name in ASCII code. All the addresses of the text data of each track are written in the pointer format. In addition, in the same figure, supplementing the number at the left end, one sector is 23
Since it is divided into columns of 4 bytes each with 52 bytes, 2352/4 = 588, so 0 to 587
Will be the line.

As shown in the figure, PT is used as a pointer from track number 1 to track number 255.
NO1 to P-TNO255 are given, and the address is given to the data of 8 bytes shown by the following equation.

[0021]

[Equation 1]

For example, when P-TNO1 is 01H, 78
From the 4th byte (4th byte of line 78) to 80x4-1
The start address and end address, the track mode, and the LINK−
P is recorded.

In the track mode, information such as copy information and emphasis is recorded, and in the LINK-P, when the track has two or more recording parts (a single song is divided into two or more recording parts). When recorded, 00H is recorded when the track ends at the pointer, and when there is a next location (data of the sequel to the song), the above formula (1) is used. Indicates the address of the next part with the same pointer as shown in.

As an example, the disk name is "DIS
When the track title of C1 ", track 1 is" TRACK1 ", and the track title of track 2 is" TRACK2 ", the contents of sector 01H of UTOC are as shown in Fig. 5. In the case of 2-byte text such as Chinese characters, the sector is 04h is used,
The recording method is the same as that for sector 01h.

However, when a plurality of text data such as track titles, artist names, and performer names are recorded as the track text data, the conventional MD system handles these text data as individual data (for example, a display). It cannot be displayed on the device).

Therefore, according to the present invention, when the text data is recorded, a specific code indicating the delimiter of the text data is recorded so as to subdivide the text data.

As a code to be added, in the case of sector 01H, for example, among the ASCII codes, "5Bh" to "5Dh" and "7B" which are not used in the MD system are used.
Eight kinds of texts can be recorded by using the code of eight from h "to" 7Fh "(that is, text data can be subdivided into eight). In the case of sector 04H, it is a 2-byte code. For example, "00H" may be added before the code to extend it to 2 bytes.

As an example, the disc name is "DISC".
1 ", the track name of track 1 is" TRACK1 ", the artist name of track 1 is" ARTIST1 ", track 2
The track name is “TRACK2”, the disc name starts with “5Bh” and the track name starts with “5Ch”.
If an additional code of “5Dh” is recorded at the beginning of the artist name, sector 01 of the UTOC according to the present invention is recorded.
The content of h is as shown in FIG. 6, and at the time of reproduction, it is possible to extract the track title and the artist name as separate data by the additional code.

In the conventional MD system which does not recognize these additional codes, there is no problem because the text data is processed (displayed on the display device, etc.) as a series of text data without being divided.

[0030]

As described above in detail, according to the present invention, an information signal such as a voice signal is converted into a digital signal and recorded on a recording medium, and the digital signal recorded on the recording medium is used as an original signal. A recording / reproducing apparatus for converting the information signal to reproduce the information signal, wherein the character information can be recorded in a specific area on a recording medium in addition to the information signal. Since the above-mentioned character information is subdivided by adding specific character information indicating, specifically, in the MD system, not only the disc name and the song name of the track but also various information related to the song ( (For example, artist name and performer name)
In addition to being able to record, it is possible to selectively retrieve only desired information (display on a display device or the like), which is extremely useful.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing a configuration of an MD system to which the present invention is applied.

FIG. 2 is a sectional view of a main part of a magneto-optical disk.

FIG. 3 is a diagram showing a format of data recorded on a magneto-optical disk.

FIG. 4 is a diagram showing a structure of a sector 01H of UTOC.

FIG. 5 is a diagram showing a recording example of a conventional UTOC sector 01H.

FIG. 6 is a diagram showing a recording example of a sector 01H of UTOC in the present invention.

[Explanation of symbols]

 1 Input Terminal 2 A / D Converter Circuit 3 ATRAC Processing Circuit 4 Digital Signal Processing Circuit 5 Recording RF Amplifier 6 Memory Circuit 7 Magnetic Head 8 MD Laser Pickup 9 Magneto-Optical Disk 10 ADIP Demodulation Circuit 11 Digital Signal Processing Circuit 12 ATRAC Processing Circuit 13 D / A conversion circuit 14 Output terminal 15 Spindle motor 16 Thread motor 17 Motor control circuit 18 Control circuit 19 Key input terminal 20 Mechanical switch input terminal

Claims (3)

[Claims] 1. A recording / reproducing apparatus for converting an information signal such as an audio signal into a digital signal for recording on a recording medium and for converting the digital signal recorded on the recording medium into an original information signal for reproduction. In a recording / reproducing device capable of recording character information in a specific area on a recording medium in addition to the information signal, the character information is added by adding specific character information representing a delimiter of the character information. A recording / reproducing apparatus characterized by subdividing information. 2. The specific character information representing the delimiter of the character information is ASCII code "5Bh" to "5Dh".
The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is at least one of the eight codes of "7Bh" to "7Fh". 3. The specific character information representing the delimiter of the character information is UT of a magneto-optical disk in an MD system.
The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is recorded in sector 01H of OC.