JP3347149B2 - Information recording apparatus and information recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information recording apparatus and method for recording information on a rewritable recording medium such as a magneto-optical disk.

[0002]

2. Description of the Related Art A compact disk (hereinafter abbreviated as CD) has been conventionally known as a read-only optical disk which is a recording medium on which acoustic information and various data are recorded. CDs used for recording audio information have a diameter of 12
There are two types, cm and 8 cm, and a maximum of about 74 minutes of information is recorded. Further, in the field of information processing such as a computer, a medium for recording a large amount of digital information (C
D-ROM).

On the other hand, in recent years, rewritable optical disks using a magneto-optical recording method, a phase change recording method, or the like have been developed. In a magneto-optical disk based on the magneto-optical recording method, information is stored as upward or downward in a perpendicular magnetization film, and information is recorded and reproduced by laser light. As a magneto-optical disk system, for example, it has a smaller diameter (6.4 cm in diameter) than a CD, has the same reproduction time as a CD, and
A rewritable magneto-optical disk and its recording / reproducing apparatus have been developed (see "Nikkei Electronics [Nikkei BP]
No. 528 (1991.5.27), pages 106 to 107 "and" Radio technology [Radio technology company]
(June 1991) pp. 9-12. " ).
In this magneto-optical disk system, for example, 16-bit data recorded on a CD is compressed into 4-bit data and recorded.

[0004]

However, in the above-mentioned conventional magneto-optical disk system, when recording acoustic information, for example, as shown in FIG.
Assuming that data (songs) are recorded in ack1, ack3, ack4, and ack1, respectively, when new data (songs) are to be recorded, the time length of the new data (songs) is the length of the unrecorded portion of the disc. If it is longer than the time length, for example, Track2
If new data (song) is to be recorded there because it is unnecessary, a part of the necessary Track 3 data
There is a problem that the data is rewritten as shown in FIG.

An object of the present invention is to solve such a problem, and an information recording apparatus and an information recording apparatus for recording information using an unrecorded area and an unnecessary area of a recorded area are provided. It is intended to provide a recording method.

[0006]

In order to solve the above-mentioned problems, the present invention according to the first aspect of the present invention provides a method for compressing data at a predetermined compression rate.
Information pieces stored at a first transfer rate based on the compression ratio
And write the information piece on a rewritable recording medium.
Recording circuit for recording is larger than the first transfer rate.
A memory for transferring at a second transfer rate and the information piece
Comparison between the interval length and the time length of the information unrecorded area of the recording medium
A first comparing means for performing the operation when the time length of the information piece is longer than the time length of the information unrecorded area;
Notification that the information piece cannot be recorded in the area
Means, after the notification by the notifying means, the recording medium
To overwrite the partial area in the information recorded area of
Means, the time length of the information piece and the designation means
Second comparing the time length of the specified partial area
Comparing means, the time length of the information piece being the information unrecorded area
If the time length is shorter than the time length of
Area, and the time length of the information piece is
Longer than the time length of the area and shorter than the time length of the partial area
If the information piece is recorded in the partial area,
The time length of the piece is longer than the time length of the partial area and the information
The time length of the area obtained by adding the unrecorded area and the partial area
The first transfer rate and the second transfer
A certain amount of information in the memory generated due to the rate and
Using the time until the pieces are accumulated, the information pieces are
Allocated to the partial area and the unrecorded area for recording
Control means.

[0007] The invention according to claim 3 is characterized in that a predetermined pressure is applied.
The information piece compressed at the compression rate is converted to a first data based on the compression rate.
Store at the transmission rate and rewrite the information piece
The first transfer rate to a recording circuit for recording on a simple recording medium.
Memory for transferring at a large second transfer rate to
An information recording method in an information recording device provided with
The time length of the information piece and the time of the information unrecorded area of the recording medium
A first comparison step of comparing the length of the information piece with the time length of the information piece
If the length is longer than the time length of the information unrecorded area,
That the information piece cannot be recorded in the information unrecorded area.
A notification step for notifying, and after the notification in the notification step,
Overwrites a partial area within the information recorded area of the recording medium
The specifying step, the time length of the information piece and the specifying step
Comparing the time length of the partial area designated overwritten by
A second comparing step, wherein the time length of the information piece is
When the time length of the information unrecorded area is shorter, the information piece is
The information is recorded in the unrecorded area, and the time length of the information piece is
Longer than the time length of the information unrecorded area and the
If it is shorter than the time length, the information piece is recorded in the partial area.
And the time length of the information piece is longer than the time length of the partial area.
Long and the information unrecorded area and the partial area are added.
If it is shorter than the time length of the area, the first transfer rate and
The memory generated due to the second transfer rate
Using the time until a predetermined amount of information pieces are stored in
The information piece is divided into the partial area and the information unrecorded area.
Shake and record .

[0008]

According to the first and third aspects of the present invention,
As shown in FIG. 4, when recording an information piece (data or music) longer than the time length of an unrecorded portion, which is an information unrecorded region, if the designated partial region is, for example, Track2, a new as Track2, since the recording I allocate a Track number "2" in the new Track2 (B) to be recorded in the new Track2 (a) and non-recorded portions are recorded within the previous Track2, required Track An information piece longer than the time length of the unrecorded portion can be recorded without rewriting the information.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a magneto-optical disk system for recording and reproducing acoustic information and the like according to the present invention. In the figure, DK is a magneto-optical disk having a perpendicular magnetization film. A guide groove is formed in the magneto-optical disk DK. The guide groove has data (ATIP: Absolute Time In) indicating absolute time information.
It is formed so as to wobble (meander) at a frequency modulated by Pregroove (FM). In data writing, information is written by being heated to a Curie temperature or higher by a laser beam and applying a magnetic field modulation to the perpendicular magnetization film.

Reference numerals 1 to 22 constitute a magneto-optical disk recording / reproducing apparatus. Reference numeral 1 denotes a spindle motor that rotationally drives the magneto-optical disk DK, 2a denotes a magnetic head, 2b denotes an optical pickup, and an actuator (not shown) that moves in the radial direction of the magneto-optical disk DK in conjunction with the magnetic head 2a, and a laser (not shown) Magneto-optical disk D having a light source, a lens, a photodetector, etc.
K is irradiated with a laser light spot, and at the time of data reproduction, the intensity of the reflected light generated by rotating the polarization plane slightly due to the magnetic Kerr effect on the magneto-optical disk DK irradiated with the light spot is detected, and the intensity is detected. It outputs an RF (Radio Frequency) signal obtained by photoelectric conversion.

3 is a spindle servo circuit for controlling the spindle motor 1, 4 is a focus servo circuit for controlling the focus of a light spot from the optical pickup 2b irradiated to the magneto-optical disk DK, 5 is a magnetic head 2a and an optical pickup 2b Is a tracking servo circuit for controlling the movement of the magnetic head 2a to the track position, and 6 is a head servo circuit for controlling the magnetic head 2a. 7 is an optical pickup 2b
Head amplifier for amplifying the output signal of the head amplifier 8, an RF amplifier 8 for generating and outputting a reproduction signal and various signals for control from the output of the head amplifier 7, and 9 a record for controlling the light spot output of the optical pickup 2b during data recording. Drive circuit.

Reference numeral 11 denotes an ATIP decoder for detecting a wobbling frequency from the output of the RF amplifier 8 during data reproduction and detecting temporal position information on the magneto-optical disk DK even when information is not recorded. The signal to be recorded is converted to EFM (Eight to Four).
an EFM encoder which converts the signal into a signal of a signal (tein modulation) and outputs the signal to the record drive circuit 9;
Is an EFM decoder that demodulates the read EFM signal output from the RF amplifier 8 at the time of data reproduction, and 14 is a device that converts the data amount of the digital signal to be recorded at the time of data recording by utilizing the minimum audible characteristic and masking effect of the human ear. A compression encoder 15 for compressing the data to about 1/5, a compression decoder 15 for demodulating the compressed data reproduced from the magneto-optical disk DK into the original data, contrary to the compression encoder 14, and a signal 16 for recording. A / D converter for converting an analog signal into a digital signal, 17 a D / A converter for converting a digital signal output from the compression decoder 15 into an analog signal, 18 a predetermined value for an output signal from the D / A converter 17 A low-pass filter (LPF) that cuts out the frequency of the signal and outputs it. DRAM is a memory for temporarily storing the recording data of about 1Mbit to prevent
(Dynamic Random Access Me
In the case of data recording, the output signal of the compression encoder 14 is temporarily stored and output to the EFM encoder 12 at the time of data recording, and the output signal of the EFM decoder 13 is temporarily stored and output to the compression decoder 15 at the time of data reproduction.

Reference numeral 20 denotes a system controller for controlling the entire apparatus at the time of recording and reproducing data. Reference numeral 21 denotes an operation unit for inputting data recording / reproducing operations.
EC), playback key (PLAY), search key (SEARC)
H), a stop key (STOP) is provided. Reference numeral 22 denotes a display unit for performing various displays during data recording / reproduction.

In the above configuration, the signal format of the information recorded on the magneto-optical disk DK is the same as the signal format of the CD. Therefore, the data to be recorded is divided into frames, and sub-coding of various information and control information on the recording data is performed for each frame. The subcode recorded by the subcoding is divided into a plurality of continuous frame units to form information. Further, at the innermost circumference of the magneto-optical disk DK, information on recorded data (hereinafter referred to as TOC: Table of Content) is stored.
ts) is recorded, and various information such as a data recording area (track) and a data length (time) are simultaneously recorded when each data is recorded.

The recorded information is recorded on a magneto-optical disk D
When reproducing K, the system controller 20 sets the TOC
Is read and stored in the RAM, which is an internal memory, and used for display and access control. When recording information on the magneto-optical disk DK, the system controller 20 generates and records the contents of the subcoding, and also updates the contents of the TOC. Next, the system controller 2 at the time of recording and reproducing information pieces such as music and data.
The control of 0 will be described.

FIG. 2 shows a control flowchart at the time of recording information according to the present embodiment. First, when the magneto-optical disk DK is loaded (step S1), the TO of the innermost disk of the disk is set.
C is read, the track number of a piece of music or data, which is an information piece recorded in the disk, and the start address and end address of each track are read (S2), and the TOC information is stored in the system controller 20 of FIG. It is stored in a memory (not shown) (S3). Next, the time (Tx) of the music piece X to be recorded is input from a key input unit (not shown) of the operation unit 21 (S4). In the case of dubbing from an optical disk reproducing apparatus such as a CD player, this input may be transferred as data from the system controller in the reproducing apparatus to the magneto-optical recording / reproducing apparatus. Next, the time (T0) of the information unrecorded area in the disk is read from the TOC information stored in the memory and loaded (S5). Then, the time length Tx of the music piece X to be recorded is compared with the time length T0 of the information non-recording area (S6). If Tx ≦ T0, the music piece X can be recorded in the information non-recording area as it is. If the recording key (REC) is operated (S7),
An information unrecorded area is searched based on the TOC information (S
8) A normal recording operation is performed (S9). That is, the optical pickup 2b and the magnetic head 2a are controlled by the system controller 20 via each servo circuit, and the music (data) is recorded on the disk. Thereafter, when the recording is completed, the optical pickup 2b and the magnetic head 2a return to a predetermined standby position and stop (S10).

On the other hand, in step S6, Tx> T0
If so, the entire song X cannot be recorded in the information unrecorded area as it is, so that "recording disabled" is displayed on the display unit 22 (S11). Next, the display unit 22 is used to ask the user whether to overwrite any track that is a partial area of the already recorded area (S12). In this case, if it is input that any of the tracks cannot be overwritten, the process returns to the stop or standby (PAUSE) state (S13). If any of the tracks (for example, track number Y) is designated and key-input is performed (S14), the time length (TY of the track of the track number Y is set to T in the memory).
Load from the OC information (S15). Here, the time length T
x is compared with TY (S16). If Tx ≦ TY, the music piece X is a track (No.
Y), the recording can be performed as it is, so after confirming that the REC key is pressed (S17), the track (N)
o. Y) is searched (S18), the above-described normal recording operation (S9) is performed, and after the end, the operation is stopped (S10).

In step S16, if Tx> TY, the flow shifts to step S19, where (Tx-TY) and Tx
Compare with 0. If Tx-TY ≦ T0, the music piece X cannot be entirely recorded in the track (No. Y), but if the time length TY portion is recorded on the track (No. Y), the remaining time length (Tx-TY) The part () means that information can be recorded in the unrecorded area. In this case, if the REC key is pressed (S20), the track (No. Y) is searched for and recorded in the portion of the music piece X having the time length TY (S2).
1). Next, the portion of the music piece X having the time length (Tx-TY) is searched for and recorded in the information unrecorded area (S22).

If the STOP key is pressed or the end address of the music transferred from the player on the reproduction side is reached, it is determined as "final" in step S23, and the track number of the portion recorded this time and the start / end addresses are determined. Etc. TO
Write to C (S24) and stop (S10).

In step S19, Tx-TY> T
In the case of 0, since the track X (No. Y) and the information non-recorded area cannot be entirely recorded in this state, the process returns to step S12 to ask again whether another track can be overwritten.

FIG. 4 is a diagram conceptually showing the above recording control procedure. In the flowchart of FIG. 2, the track (No. Y) is used, but in FIG. 4, the track (No. 2) is used as an example. In this embodiment, as shown in FIG. 4, it is possible to record one music piece by allocating it to a track (No. 2 (A)) and a track (No. 2 (B)).

Here, during recording, the track (No. 2)
The optical pickup 2b and the magnetic head 2a move from the end of (A)) to the start of the track (No. 2 (B)) while performing a high-speed search. During this time, the music is continuously reproduced without interruption. The principle will be described with reference to FIG. A indicates an information transfer rate from an external music source, B indicates a data compression rate in the compression encoder 14, C indicates an information transfer rate (first transfer rate) from the compression encoder 14 to the DRAM 19, and E indicates a DRAM 19
, The information transfer rate (second transfer rate) to the recording circuit including the EFM encoder 12 and the like. Here, the relationship of C = A × B is established. When a normal value is applied to A to E as an example, A = 1.4 Mbps (Mbit / sec) B = 0.21 C = 0.3 Mbps D = 1 Mbit E = 1.4 Mbps Therefore, under the above conditions, the DRAM 19 can compress the data compressed to about 1/5 for a maximum of about 3.3 seconds (=
(1 Mbps 蓄積 0.3 Mbps) can be stored. On the other hand, even if the accumulated data is accumulated up to the maximum capacity, the DRAM 19 is kept for about 0.7 seconds (= 1 Mbit ÷).
(1.4 Mbps) to the recording circuit.
The optical pickup 2b and the magnetic head 2a perform a high-speed search for another track using a time difference of 2.6 seconds (= 3.3-0.7) until data is accumulated up to the maximum capacity of the RAM 19. You can do it.

In the case of the example of FIG. 4, step S of FIG.
At 24, for example, the following information is written in the TOC. 1 00:00:00 03:00:10 2 03:02:10 10:20:30 3 10:22:30 18:30:40 4 18:32:40 25:40:50 225: 42: 50 30:50:60 In the above format, the left column shows a track number. The center column indicates the start address (the start point of the information recording area is 00: 00: 00: 00, and the elapsed time up to that point is represented by "minute": "second": "frame".
75 frames = 1 second. ), And the right column shows the end address. In this case, the previous track 2 is No.
2 (A), and the subsequent track is No. 2. 2 (B). Therefore, when the data is allocated and recorded, there are multiple track addresses having the same track number. However, the reproduction order of the music pieces is the one with the smaller time address first, and corresponds to the order on the disc.

Next, FIG. 3 shows a control flowchart for reproducing a music from the magneto-optical disk DK on which the music is allocated and recorded as described above. First, when a disc is loaded (step S31), the TOC is read (S3).
2). Next, the TOC information is stored in a memory (not shown) inside the system controller 20 of FIG. 1 (S3).
3). At this time, if the same music is allocated to several tracks and recorded, a plurality of time addresses exist in the TOC with the same track number. If the allocated tracks are distant, they are stored in the TOC in the same order. However, if there are multiple track numbers in the TOC, if there are multiple track numbers, it is determined whether the track number is the last or not. Need to be searched during the reproduction of a song, and a loss time occurs. Therefore, at the step 33 of storing the TOC information in the memory, the system controller 20 organizes and stores the time addresses for each track number. This example is shown in FIG. In FIG. 5, track i is allocated to three tracks, track k is allocated to two tracks, and the tracks are separated, but are arranged and stored in the order of addresses in the disk as shown in FIG. By doing so, when the music is reproduced, the search can be performed in accordance with the order of the addresses, so that the loss time is reduced. Next, in step S34 in FIG. 3, after confirming whether the PLAY key is pressed or not, when the disk is to be continuously reproduced from the beginning, the track is searched from the track number 1 (S35). The track is reproduced as in the normal case (S36). Next, it is determined whether the reproduction of the information of the track number is completed or whether data (song) of the same track number still remains (S).
37). If there is still another data (song) with the same track number, the data is temporarily stored in the DRAM 19 using the DRAM 19 from that moment, and the data of the same track number that has not been reproduced is searched at a high speed and reproduced. (S41).

This principle will be described with reference to FIG. FIG.
Has a completely opposite relationship to FIG. That is, a relationship of A = C × (1 / B) is established, and if a normal value is applied as an example, A = 1.4 Mbps 1 / B = 4.67 C = 0.3 Mbps D = 1 Mbit E = 1. 4 Mbps. Therefore, under the above conditions, the DRAM 9 accumulates at most 1 Mbit of data read by the optical pickup (compressed to about 1/5 and recorded on the disk), but the required time in that case is the reproduction time including the EFM decoder 13 and the like. Information transfer rate from circuit (second transfer rate) E
Is 1.4 Mbps, so it takes about 0.7 seconds (= 1 Mbi
t ÷ 1.4 Mbps). On the other hand, since the information transfer rate (first transfer rate) C from the DRAM 19 to the compression decoder 15 as the expansion circuit is 0.3 Mbps,
It takes about 3.3 seconds (= 1 Mbit ÷) to transfer all the data stored in the DRAM 19 to the decoding side at the time of maximum storage.
0.3 Mbps). Therefore, the time difference
The optical pickup 2b can perform a high-speed search to another track using the time of 6 seconds (= 3.3-0.7).

[0027] In this way, the allocated music is reproduced without interruption. When the reproduction of the allocated music is completed, it is determined (S42), the track number is incremented by one (S38), and the reproduction of all the music in the disc is completed or the STOP key is pressed. In this case, it is determined as "final" (S39) and the operation is stopped (S40).
If it is not "final", the next track is reproduced and repeated until the last track.

In this way, even if a song is longer than the time length of the unrecorded area, the song can be allocated and recorded and reproduced without interruption. In the above-described embodiment, an example has been described in which the TOC information is stored in a memory (not shown) inside the system controller 20 of FIG. You can do it. This is because, due to the data storage effect of the DRAM 19, it is possible to search at any time whether or not there is a plurality of pieces of the same track number information in the TOC during reproduction.

[0029]

As described above, according to the present invention,
In a rewritable recording medium, even if the time length of the information piece to be recorded is longer than the time length of the unrecorded area, the unrecorded area and the unnecessary area of the recorded area are used. This makes it possible to record information.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a control flowchart at the time of information recording in one embodiment of the present invention.

FIG. 3 is a diagram showing a control flowchart at the time of information reproduction in one embodiment of the present invention.

FIG. 4 is a diagram illustrating the operation of one embodiment of the present invention.

FIG. 5 is a diagram showing an example of a table in a memory at the time of reproduction according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an operation during recording according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating an operation at the time of reproduction according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a problem in a conventional magneto-optical disk system.

[Explanation of symbols]

 DK: magneto-optical disc 1: spindle motor 2a: magnetic head 2b: optical pickup 3: spindle servo circuit 4: focus servo circuit 5: tracking servo circuit 6: head servo circuit 7: head amplifier 8: RF amplifier 9: record drive circuit DESCRIPTION OF SYMBOLS 11 ... ATIP decoder 12 ... EFM encoder 13 ... EFM decoder 14 ... Compression encoder 15 ... Compression decoder 16 ... A / D converter 17 ... D / A converter 18 ... Low-pass filter 19 ... DRAM 20 ... System controller 21 ... Operation part 22 ... Display Department

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tsutomu Sasaki 4-2610 Hanazono, Tokorozawa-shi, Saitama Prefecture Pioneer Corporation Tokorozawa Plant (72) Inventor Ahiko Hashioya 4-2610 Hanazono, Tokorozawa-shi, Saitama Pioneer Shares (72) Inventor Ryo Oda 4-2610 Hanazono, Tokorozawa City, Saitama Prefecture Pioneer Corporation Tokorozawa Plant (56) References JP-A-5-89643 (JP, A) JP-A-2-203469 ( JP, A) JP-A-3-40269 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 7/00 G11B 20/10 G11B 27/10

Claims (4)

(57) [Claims] 1. An information piece compressed at a predetermined compression ratio is
Store at the first transfer rate based on the compression ratio, and
Recording circuit for recording information pieces on a rewritable recording medium
A second transfer rate larger than the first transfer rate.
Memory for transferring data, the time length of the information piece and the information unrecorded area of the recording medium.
First comparing means for comparing a time length with the time length of the information piece, and when the time length of the information piece is longer than the time length of the information non-recorded area, the information piece is not recorded in the information non-recorded area.
Notification means for notifying that the recording medium is possible, and, after the notification by the notification means, information recording on the recording medium.
Specifying means for overwriting a partial area in a recorded area; and a time length of the information piece and overwriting specified by the specifying means.
Second comparing means for comparing the time length of the partial area obtained
If the time length of the information piece from the time length of the information unrecorded area
If it is short, the information piece is recorded in the unrecorded area
The time length of the information piece is the time length of the information unrecorded area.
If it is longer and shorter than the time length of the partial area,
The information piece is recorded in the partial area, and the time length of the information piece is recorded.
Is longer than the time length of the partial area and the information unrecorded area
When the time length is shorter than the time length of the area obtained by adding the area and the partial area
Between the first transfer rate and the second transfer rate.
A predetermined amount of information pieces are stored in the memory
The information piece is divided into the partial area
Control means for allocating and recording information to the information unrecorded area
Information recording apparatus characterized in that it comprises and. 2. The information processing apparatus according to claim 1, wherein the control unit includes :
The time length of the partial area is recorded in the partial area, and the information
The remaining part of the piece is recorded in the information unrecorded area.
The information recording device according to claim 1, wherein 3. An information piece compressed at a predetermined compression ratio is
Store at the first transfer rate based on the compression ratio, and
Recording circuit for recording information pieces on a rewritable recording medium
A second transfer rate larger than the first transfer rate.
Information in the information recording apparatus provided with a memory to be transferred by preparative
Information recording method, wherein the time length of the information piece and the information unrecorded area of the recording medium
A first comparing step of comparing a time length with the time length of the information piece,
If it is long, the information piece cannot be recorded in the information unrecorded area.
A notification step of notifying that the information is possible, and after the notification in the notification step, information recording of the recording medium
A designation step of overwriting a partial area in a completed area, and a time length of the information piece and an overwriting designation in the designation step.
A second comparing step of comparing the time length of said partial region with
And the time length of the information piece is longer than the time length of the information unrecorded area.
If it is short, the information piece is recorded in the unrecorded area
The time length of the information piece is the time length of the information unrecorded area.
If it is longer and shorter than the time length of the partial area,
The information piece is recorded in the partial area, and the time length of the information piece is recorded.
Is longer than the time length of the partial area and the information unrecorded area
When the time length is shorter than the time length of the area obtained by adding the area and the partial area
Between the first transfer rate and the second transfer rate.
A predetermined amount of information pieces are stored in the memory
The information piece is divided into the partial area
And recording the information in the unrecorded area.
Information recording method to be used. 4. The time length of the partial area of the information piece
And the remaining portion of the information piece is recorded in the partial area.
The information is recorded in an information unrecorded area.
Information recording method described.