JP3363573B2 - Mini disk 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 mini disk (MD) device for recording / reproducing information signals such as audio signals using a magneto-optical disk as a recording medium.

[0002]

2. Description of the Related Art A mini disk device compresses / decompresses an audio signal converted into a digital signal on a magneto-optical disk having a diameter of 64 mm by a high efficiency coding called ATRAC system to record / reproduce. It is something to do.

[0003]

In the case of performing recording on an already-recorded area in a mini-disk device, in the conventional mini-disk device, the area in which the over-recording is performed is performed before the overlap-recording. Even if the area is shorter than the area, the data after the area where the overwriting is performed cannot be reproduced.

For example, as shown in FIG. 6, when a new recording is performed from position A to position B on a disk recorded from track 1 to track 5, in a conventional mini disk device, Even if there is a recorded track after the position B, that part is regarded as a free recordable area and cannot be reproduced. In this way, if the portion which has become the free recordable area is newly overwritten, the newly overwritten data can be reproduced.

[0005]

In order to solve the above problems, the present invention provides a new information signal to a magneto-optical disk on which information signals of a plurality of tracks and address information about the plurality of tracks are recorded. The mini-disk device for overwriting recording has a reading means for reading address information on the plurality of tracks and a setting means for setting a recordable area, and the setting means has an arbitrary position when starting the overwriting. Is set as the start address of the recordable area, and the end address of the track including the address of the arbitrary position is set as the end address of the recordable area based on the read address information. If the recording is continued beyond the end address of the recorded recordable area, the read address information Based on, is to provide St. mini disk apparatus characterized by resetting the to the end address from the start address of the next track of the track containing the address of said arbitrary position as a new recordable area.

Further, according to the present invention, the setting means sets a plurality of arbitrary tracks as recordable areas in advance based on the read address information when starting the overlap recording. It is intended to provide a mini disk device.

Further, according to the present invention, in the mini-disk device for recording a new information signal on a magneto-optical disk on which information signals of a plurality of tracks and address information on the plurality of tracks are recorded, the over-recording is performed. Before performing the comparison, the storage means for storing the start address of the already set recordable area is compared with the address of the end position of the overlap recording after the over-recording and the address stored in the storage means. If the address of the end position of the overwriting recording is larger than the address stored in the storage means based on the means and the comparing means, the address of the ending position of the overwriting recording is set as the start address of the new recordable area. ,
And a setting means for setting the address stored in the storage means to the start address of a new recordable area when the address of the end position of the overwriting is smaller than the address stored in the storage means. It is intended to provide a mini disk device.

[0008]

With the above-mentioned structure, even if the overwriting is performed from an arbitrary position on the magneto-optical disk in which some tracks have already been recorded, the tracks located after the overwriting end position are recorded. The data is played.

Further, the overwriting is performed only between designated tracks, and the data of the track located at the rear is not accidentally overwritten.

Further, when there is no track behind the end position of the overlap recording, the end position of the overlap recording is set to the start address of the free recordable area, while
When there is a track behind the end position of overwriting, the end position of the track is set as the start address of the free recordable area.

[0011]

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

FIG. 1 is a circuit block diagram showing a configuration of a mini disk device to which the present invention is applied. 1 in the figure
Is an input terminal for receiving an analog information signal such as a voice signal, 2 is an A / D conversion circuit for converting the analog information signal input from the input terminal 1 into a digital signal, and 3 is the A / D conversion circuit 2 A digital information signal output by the device is compressed and converted into a high-efficiency coded digital signal A
The TRAC processing circuit 4 is a digital signal processing circuit for interleaving the information signal processed by the ATRAC processing circuit 3, adding an error correction code, and converting the information signal into a digital signal to which a subcode signal is added.

Reference numeral 5 is a recording RF amplifier, which converts the output signal from the digital signal processing circuit 4 into a signal for recording on the disk 9 by the recording magnetic head 7. Reference numeral 6 is a shockproof memory circuit for temporarily storing a compressed digital signal, and 8 is a laser pickup for heating the disk surface to the Curie temperature during recording and reading a pit signal during reproduction. 10
Is an ADIP demodulation circuit including a reproduction RF amplifier for amplifying the signal read from the laser pickup 8 during reproduction, 11 is a digital signal processing circuit for performing processing such as error correction on the signal output from the ADIP demodulation circuit 12, 12 Is an ATR which expands the signal processed by the digital signal processing circuit 11 and demodulates it to the original digital signal.
An AC processing circuit, 13 is a D / A conversion circuit for converting a digital signal into an original analog information signal, and 14 is an output terminal of the converted information signal.

Reference numeral 15 is a spindle motor for rotating the disk 9, 16 is a thread motor for moving the laser pickup 8 and the recording magnetic head 7 to the inner and outer circumferences of the disk 9, and 17 is the spindle. A motor control circuit for controlling the motor 15 and the sled motor 16. Reference numeral 18 is a control circuit for controlling the operation of the entire mini disk device. The control circuit 18 controls a motor control circuit 17 for controlling the spindle motor 15 and the sled motor 16, and
The ATRAC circuit 3, the digital signal processing circuit 4, the shock proof memory circuit 6, and the digital signal processing circuit 6 perform the operation processing of the mechanism and the like and the processing of the subcode data based on the information from the key input terminal 19 and the mechanical switch input terminal 20. It controls the signal processing circuit 11 and the ATRAC circuit 12. The control circuit 18 is composed of a system controller using a microcomputer. Further, the control circuit 18 performs an overlap recording process which is a feature of the present invention described later.

Next, the basic operation of recording / reproducing in the mini disk device will be described. First, the input terminal 19
When the disk 9 is set to the recording mode by the operation key signal of the mechanical switch input terminal 20 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 disk 9 focuses the light. , Focus is applied on the disc surface. Further, the recording frequency is recorded in the recording area of the disc 9 (Fs = 4).
Since the waviring at 4.1 kHz) is applied, the ADIP signal is demodulated by this.

At this time, the spindle motor 15 is rotated and the spindle servo is applied by the EFM signal or the ADIP signal. Further, the sub-beam of the laser pickup 8 also performs tracking servo and sled servo. Then, the disk is heated to the Curie temperature by the laser pickup 8 based on the ADIP address, and recording is performed by the magnetic head 7.

As the signal to be recorded, an analog information 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 obtain a digital signal. Signal processing circuit 4
, The error correction code is added, the time control is performed by the shock proof memory circuit 6, the sub code information such as the address information to be recorded generated by the control circuit 18 is added, and the result is sent to the RF recording amplifier 5. And recorded.

On the other hand, when the reproduction mode is set, the laser pickup 8 emits light under the control of the control circuit 18 to focus on the reflection surface of the disk 9 and focus on the disk surface. Further, the spindle motor 15 is rotated and the spindle servo is applied by the EFM signal or the ADIP 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, sent to the reproduction RF amplifier and ADIP demodulation circuit 10, and then the digital signal processing circuit 1
1, the error correction and the deinterleaving are performed, the time control is performed using the shock proof memory circuit 6, the original digital signal is expanded by the ATRAC processing circuit 12, and the D / A conversion circuit 13 is executed. The original analog signal is converted and output from the output terminal 14.

Next, the disk used in the mini disk device will be described in detail. In the mini disk device,
As shown in FIGS. 2 to 4, a reproduction-only disc (premastered MD), a recordable disc (recordable M)
D), there are three types of hybrid discs that have both a read-only area and a recordable / reproducible area.

In each figure, the disc has a lead-in area 2 in which data is recorded in the same pits as the CD-DA.
1, pre-mastered area 22, lead-out area 2
3, a UTOC area 24 which is a wavy groove that can be actually recorded, a recordable area 25, and a lead-out area 26. Data such as audio signals are recorded in the premastered area 22 and the recordable area 25. Is recorded.

Next, the operation of the present invention will be described with reference to FIG. Normally, when recording in the recordable area 25, in the case of an unrecorded disc, the lead-in area 21
The start address and end address of the TOC data recorded in the area from the user area start address to the lead-out start address are registered in the UTOC as the free recordable area 26. As recording is performed, the start address of the free recordable area is replaced with the currently recorded address. When the track being recorded becomes new, the start address and end address of the track are registered in the UTOC.

FIG. 5 (a) where the recording is performed in this way
In the disc shown in (1), when overwriting is performed from an arbitrary position A, in the conventional mini-disc device, since all the tracks after the position A are set as the free recordable area as described above, the overwriting is performed up to the position B in the figure. In the case of doing, the track 5 which was not overwritten could not be reproduced.

Therefore, in the present invention, when the overlap recording is performed from the position A, the start position C of the free recordable area 26 is recorded.
Is previously stored in the memory, and recording is performed from the position A to the end address (position D) of the track 2 as the first free recordable area (in this example, the first half of the track 3 '). When recording is performed up to the end address (position D) of the track 2 (the latter half of the track 3'in this example), recording is continued with the track 3 in FIG. 5A as a free recordable area.

When recording is advanced in this way and a new track is created, the start address and end address of the overwritten track are registered in the UTOC. When the overwriting is completed up to the position B (up to the track 5 ') in this way, the starting address of the starting position C of the original free recordable area stored in the memory is read out and the final track newly given by the overwriting is read. If the number (track 5'after recording in this example) is equal to or greater than the track number before overwriting (track 5 before recording in this example) in the free recordable area, the track numbers after that are advanced. . As a result, the track 5 before overwriting is
After the overwriting, the track 6'is changed to be accessible and reproducible.

Incidentally, in FIG. 5, in order to distinguish from the track before the over-recording, the track number newly added in the over-recording is expressed by adding a dash, but as described above, the track 6 ' The contents (music information etc.) are the same as the contents of the track 5 before the over-recording, and the track numbers are only renumbered.

As yet another embodiment, as shown in FIG. 5A, a specified magnetic track is recorded between the designated tracks, for example, track 2.
From the position to the track 4 (from the position X to the position Y in the figure) is designated in advance, and the overlap recording is performed only in the designated section. After the end of the overlap recording, the start address of the free recordable area is not set to the end position of the overlap recording, but is set to the start address of the free recordable area before the overlap recording (position C in the figure). As a result, the track 5 can be reproduced even after the overwriting is performed.

[0028]

As described above in detail, according to the present invention, a new information signal is recorded on a magneto-optical disk in which information signals of a plurality of tracks and address information about the plurality of tracks are recorded. In the mini disk device to
The recording medium has a reading means for reading out address information on the plurality of tracks and a setting means for setting a recordable area, and the setting means starts an address at an arbitrary position at the start of the recordable area. While setting as the address, based on the read address information, the end address of the track including the address of the arbitrary position is set as the end address of the recordable area,
When recording is continued beyond the end address of the set recordable area, from the start address of the track next to the track including the address of the arbitrary position, based on the read address information. Since the area up to the end address is reset as a new recordable area, it is possible to reproduce the data from the next track at the position where the overwriting is completed.

Further, according to the present invention, the setting means sets a plurality of arbitrary tracks as recordable areas in advance based on the read address information when starting the overlap recording. It becomes possible to replace the tracks by recording only between designated tracks.

Further, according to the present invention, in the mini-disc device for superposing a new information signal on the magneto-optical disc on which the information signals of a plurality of tracks and the address information on the plurality of tracks are recorded, Before recording, the storage means for storing the start address of the already set recordable area is compared with the address of the end position of the overlap recording after the overlap recording and the address stored in the storage means. Based on the comparison means and the comparison means, when the address of the end position of the overlap recording is larger than the address stored in the storage means, the address of the end position of the overlap recording is set as the start address of the new recordable area. If the address of the end position of the overlap recording set is smaller than the address stored in the storage means, the address stored in the storage means Since it has a setting means for setting the start address of a new recordable area, when overwriting is performed from any position in the recorded recordable area and the recording is finished at any position, the position where the overwriting is finished The data from the next track can be left and reproduced.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing a configuration of a mini disk device of the present invention.

FIG. 2 is a side sectional view of a main part showing the structure of a read-only disc.

FIG. 3 is a side sectional view of a main part showing the structure of a recordable disc.

FIG. 4 is a side sectional view of a main part showing the configuration of a hybrid disc.

FIG. 5 is a diagram for explaining the operation of the present invention.

FIG. 6 is a diagram for explaining a conventional operation.

[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 Shockproof memory circuit 7 Recording magnetic head 8 laser pickup 9 discs 10 Playback RF amplifier 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 21 Lead-in area 22 Pre-Mustard Area 23 Lead-out area 24 UTOC area 25 recordable area 26 Free Recordable Area

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Claims (3)

(57) [Claims] 1. An information signal of a plurality of tracks and the plurality of tracks .
In a mini disk device for recording a new information signal on a magneto-optical disk on which address information on a rack is recorded , a read operation for reading address information on the plurality of tracks
It has a protrusion means and a setting means for setting the recordable area.
However, the setting means is set to an arbitrary position when starting the overlap recording.
Set the address of as the start address of the recordable area
And based on the read address information
Then, the end address of the track including the address of the arbitrary position is set as the end address of the recordable area, and when the recording is continued beyond the end address of the set recordable area, the reading is performed. Address information
On the basis of the above, the mini disk device is characterized in that the start address to the end address of the track next to the track including the address of the arbitrary position is reset as a new recordable area. 2. The mini disk device according to claim 1, wherein the setting means further comprises :
A minidisk device characterized in that a plurality of arbitrary tracks are previously set as recordable areas based on the read address information. 3. Information signals of a plurality of tracks and the plurality of tracks
In a mini-disk device that records new information signals on a magneto-optical disk that has recorded address information about the rack , records the start address of the recordable area that has already been set before performing over-recording. The address of the end position of the overlap recording is stored based on the storage device, the comparison device for performing the overlap recording and comparing the address of the end position of the overlap recording with the address stored in the storage device. If it is larger than the address stored in the recording means, the address of the end position of the overlap recording is set to the start address of the new recordable area, and the address of the end position of the overlap recording is larger than the address stored in the storage means. If it is smaller, it has a setting means for setting the address stored in the storage means to the start address of a new recordable area. Mini disk device to collect.