JP3432856B2 - Recording and playback 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 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.

In the MD system, an analog audio signal is converted into a digital signal and recorded, and a start portion and an end portion of a song are used as address information of the song along with other subcode signals in a fixed recording area. It is used for accessing the music number at the time of reproduction based on the address information. This recording area is referred to as a "UTOC area", and new address information must be recorded when the music signal is recorded. In addition to this, it is possible to record the recorded date and time, title, song title, etc. in the UTOC area.

[0004]

However, the address information, the recorded date and time, the title, the title of the song, etc., are not included in the UTOC.
All are recorded by the pointer method, and the information of the actual data recording area has an area for recording the subcode information.
It is not possible to record the SKIP-ID (ID that the user records in order to skip a specific part in reproduction and reproduce it) as seen in a tape system.

[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. A recording / reproducing device for reproducing
The recording medium has first information on which address information indicating a start portion and an end portion of each track of a recorded digital signal is recorded.
Area and a second area in which subcode information such as character information provided in association with each track is rewritably recorded, and when reproducing an arbitrary track, the arbitrary area is recorded in the second area. If a predetermined special character is recorded in association with the track, the reproduction of the associated arbitrary track is prohibited, and if the predetermined special character is not recorded in the second area, It is intended to provide a recording / reproducing apparatus having a control means for controlling reproduction of an arbitrary track.

In the present invention, the predetermined special character is
UTO of magneto-optical disk in mini disk system
Record in C sector 01H.

[0007]

With the above configuration, when the track recorded on the recording medium is reproduced, if control information is present, the specific track is not reproduced according to the control information and the next track is skipped. To do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 is an input terminal for inputting 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.
An ATRAC processing circuit 4 for compressing the information signal output from the conversion circuit 2 and converting it into a high-efficiency coded digital signal interleaves the digital signal output from the ATRAC processing circuit 3 with an error correction code, and further A digital signal processing circuit 5 for converting a digital signal to which a code signal is added is a recording RF amplifier for recording an output signal from the digital signal processing circuit 4 on a magneto-optical disk 9 by a recording magnetic head 7. Signal is converted to.

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., and the ATRAC circuit 3 , 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 EFM signal or A
Spindle servo by DIP 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 A
The digital signal processing circuit 1 is sent to the DIP demodulation circuit 10.
1 is processed to perform error correction, deinterleaving, etc., and time control is performed using the memory circuit 6.
The processing circuit 12 expands the original digital signal, the D / A conversion circuit 13 converts the original digital signal, and outputs the original analog signal from the output terminal 14.

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, a disc title and a song name are recorded in the sector 01H, a disc recording date and time and a song recording date and time are recorded in the sector 02H, and a sector 0 is recorded.
In 4H, a disc title such as kanji and a song title are recorded.

FIG. 4 shows a schematic diagram of the UTOC sector 00H. This UTOC sector 00H is data that must be recorded and updated after the audio signal is recorded.
The start address and end address of a track (= indicating a song recorded on the disc) are also recorded here. The start address and end address of this track are all written in pointer format. In the figure, supplementing the number at the left end, one sector is 2352 bytes, and this is divided into columns of 4 bytes, so 2352/4 = 588.
And therefore the rows from 0 to 587.

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-in the 8th byte of the byte (the 3rd byte of the row 80).
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. The same pointer as shown indicates the address of the next part. In the breakdown of the address 3 bytes and 24 bits, the upper 14 bits indicate the cluster, the next 6 bits indicate the sector, and the lower 4 bits indicate the sound group. Sound groups
As a minimum unit during reproduction, 11 sound groups form 2 sectors.

FIG. 5 shows a schematic view of the sector 01H of the UTOC. In this UTOC sector 01H, the disc title and song title are ASCII in the pointer format of the above formula (1).
Recorded by code. This sector data is optional, and some devices cannot record it.

Further, in the MD, the address management of the recording / reproducing disk is performed in the sector 00H of the UTOC, and a certain piece of music is divided into two with respect to the audio information recorded in the recording area.
The operation to erase only a certain part of the song is this U
This can be done simply by rewriting sector 00H of TOC. However, in this address management, only the necessary parts are managed, and the unnecessary parts are all treated as unrecorded parts. Therefore, the necessary parts and unnecessary parts are reproduced separately, and the unnecessary parts are heard. Operation is impossible.

In the present invention, the address management by the UTOC sector 00H and the disc name and the track name of the UTOC sector are used, and the portion after the position of a certain song is an unnecessary portion like the SKIP-ID used in DAT. Then, this song is divided into two songs from that position by key input, and a fixed song name in the track name of the subsequent song, for example, "## SKIP" is recorded. When reproducing, if the track name of "## SKIP" is not recognized and reproduced, an unnecessary portion need not be heard. If you provide a "SKIP ON / OFF" key like DAT,
You can listen to or skip this "## SKIP" track. In addition, a device with an editing function that can divide a song or record the song name, divides the song by itself and uses a predetermined song name, such as "##
If you record "SKIP", you can skip and listen to the song.

Therefore, as in the recording example on the disc shown in FIG. 6, when the portion after the certain position of the second music piece is an unnecessary portion, the UTOC sector 00H as shown in FIG. The start address and end address up to the eye are recorded (recorded in lines 76 to 85), and in the UTOC sector 01H shown in FIG. 8, a position corresponding to the third track (from the first byte of line 78 to the line). The second byte of 79) is "## SKIP", that is, A
23H (#, "00100011" in the SCII code
1 "), 23H (#," 00100011 "), 53H
(S, "01010011"), 4BH (K, "010"
01011 "), 49H (I," 0100100
1 ") and 50H (P," 01010000 ") are recorded, the track name of"## SKIP "is recognized at the time of reproduction, and the track is skipped and reproduced.

[0028]

As described above in detail, according to the present invention, an information signal such as an audio signal is converted into a digital signal and recorded on a recording medium, and the digital signal recorded on the recording medium is reproduced. In the recording / reproducing apparatus, the address information indicating the start and end portions of each track of the digital signal recorded on the recording medium, and the sub-code information such as character information provided in association with each track are respectively described above. In a recording / reproducing apparatus for recording in a specific area on a recording medium,
By recording the control information in the area for recording the character information given in association with the track, when the track recorded on the recording medium is reproduced, the specific track is not reproduced according to the control information. So
You can skip this track and play the next track without erasing the tracks you don't want to play.
A function equivalent to D "can be provided.

[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 UTOC sector 00H structure.

FIG. 5 is a diagram showing a UTOC sector 01H structure.

FIG. 6 is a schematic diagram showing an example of recording on a disc.

FIG. 7 is a diagram showing a recording example of UTOC sector 00H.

FIG. 8 is a diagram showing a recording example of a UTOC sector 01H.

[Explanation of symbols]

1 input terminal 2 A / D conversion circuit 3 ATRAC processing circuit 4 Digital signal processing circuit 5 RF amplifier for recording 6 memory circuits 7 magnetic head 7 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 terminals 15 Spindle motor 16 thread motor 17 Motor control circuit 18 Control circuit 19 key input terminals 20 Mechanical switch input terminal

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 27/10 G11B 20/12

Claims (2)

(57) [Claims] 1. A recording / reproducing apparatus for converting an information signal such as an audio signal into a digital signal to record it on a recording medium and reproducing the digital signal recorded on the recording medium, wherein the recording medium comprises: First information in which address information indicating the start portion and the end portion of each track of the recorded digital signal is recorded
Area and a second area in which subcode information such as character information given in association with each track is rewritably recorded, and when the arbitrary track is reproduced, the arbitrary area is recorded in the second area. If a predetermined special character is recorded in association with the track, the reproduction of the associated arbitrary track is prohibited, and if the predetermined special character is not recorded in the second area, A recording / reproducing apparatus having a control means for controlling reproduction of an arbitrary track. 2. The predetermined special character is UTOC sector 01H of a magneto-optical disk in a mini disk system.
The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is recorded on the recording medium.