JPH05325508A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the confirmation of a recording state of just recorded music and sound by starting reproducing the just recorded audio signal from its head upon pressing a reproducing key after pressing a stop key from the recording state. CONSTITUTION:When the recording state of the audio signal in a minidisk recording/reproducing device 1 is desirable to be confirmed, a recording key 10 is pressed and hence the recording state is set. When a pause key 5 or the stop key 6 is pressed during recording, the recording state is stopped. Then, when the reproducing key 4 is pressed, the just recorded music is started to be reproduced from its head. On the other hand, when the recording key 10 is pressed again after recording state is stopped, the recording is resumed from the previous recording ending position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus for recording / reproducing an optical disc or a magneto-optical disc having a diameter of 64 mm contained in a cartridge.

[0002]

2. Description of the Related Art 64 mm diameter stored in a cartridge
Mini disc (MD) systems for recording / reproducing digital audio signals using the optical discs or magneto-optical discs have been developed. In the mini disc, a digital audio signal is compressed to about 1/5 and recorded by using a voice compression technique. As a result, it is possible to record / reproduce an audio signal having a high sound quality of about 74 minutes on a disc having a small diameter of 64 mm.

In a mini disk recording / reproducing apparatus,
At the time of data recording, it is necessary to control the laser power, and the interleaving length of CIRC is 108 frames, which is longer than the length of one sector. Therefore, a linking area is required. For this reason, recording / reproduction is performed on the mini disk in units of clusters each including 36 sectors. Of the 36-sector cluster, data is recorded in 32 sectors. The remaining 4 sectors are
Used for linking and sub data.

During reproduction, data is reproduced from the optical disc at a transfer rate higher than that of a decoder that decompresses the data. This reproduction data is once stored in the buffer memory (RAM). The buffer memory is filled with digital signals in about 0.9 seconds. Even if the digital signal on the disk cannot be read due to vibration or the like, the reproduced signal continues to be output for about 3 seconds due to the data stored in the buffer memory. By re-accessing the optical pickup to the original position and reading the signal again during that time, it is possible to prevent so-called sound skipping. This buffer memory is called a shock proof memory.

[0005]

In such a mini disk recording / reproducing apparatus, it is sometimes desired to confirm the recording state of the recorded audio signal. In such cases,
When the recording of one song is completed, the position is returned to the beginning of the recorded song, and the reproduction is started from the beginning of the song. Therefore, it is convenient and convenient to confirm the recording state if it has a function of starting the reproduction of the music recorded immediately before after the recording of one music is completed. In conventional audio recording / playback with tape, random access cannot be performed in a short time, and when recording of one song is completed, the tape position is returned to the beginning position of the song, and playback is started from the beginning of the song. Operation cannot be performed in a short time. On the other hand, in the mini disc, random access can be performed at high speed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk recording / reproducing apparatus capable of easily confirming a recording state of a voice or a music recorded immediately before.

[0007]

When the stop key 6 and the reproduction key 4 are pressed in the recording state, reproduction is started from the beginning of the audio signal recorded immediately before. Therefore, it is possible to easily confirm the recording state of the song or the voice recorded immediately before.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an entire mini disk recording / reproducing apparatus to which the present invention is applied.
In FIG. 1, a disc mounting tray 8 and a display 9 are arranged on the front panel 1A of the mini disc recording / reproducing apparatus 1. Further, the front panel 1A of the mini disk recording / reproducing apparatus 1 has a power key 2, an eject key 3, a reproducing key 4, a pause key 5, a stop key 6, and an A key.
MS keys 7A and 7B and a recording key 10 are provided.

By operating the eject key 3,
As indicated by the alternate long and short dash line, the disc mounting tray 8 is pulled out. A mini disk (not shown) is placed on the disk mounting tray 8. When the disc mounting tray 8 is housed inside, a mini disc is loaded.

The display 9 displays time information such as the total playing time of the mounted mini disk, the elapsed time of the music being played, the remaining playing time of the playing, and the remaining playing time of the whole, as well as time information of the playing. The track number of the song is displayed. In the case of a disc on which the disc name and the track name are recorded, the disc name and the track name are displayed on the display 9.

FIG. 2 shows the structure of a mini disk recording / reproducing apparatus to which the present invention is applied. In FIG. 2, 11 is a mini disk. The mini disk 11 is
An optical disk 11 with a diameter of 64 mm in the cartridge 11A
It is constructed by storing B. In this mini disk 11,
There are three types of discs: a read-only optical disc, a recordable magneto-optical disc, and a hybrid disc in which a read-only area and a recordable area are mixed.

The disk 11B of the mini disk 11 is rotated by the spindle motor 12. Mini disc 1
1 is provided with a shutter, and a mini disk 11
When is attached, the shutter is opened. In the case of a recordable optical disk, the recording magnetic head 13 is arranged facing the upper part of the disk 11B, and the optical pickup 14 is arranged facing the lower part of the disk 11B. In the case of a reproduction-only optical disc, the disc 11B
The optical pickup 14 is disposed below the lower part of the optical pickup.

The rotation of the spindle motor 12 is controlled by the servo control circuit 15. Optical pit up 14
The movement of the disk 11B in the radial direction is controlled by the feed motor 16. Further, the servo control circuit 15 performs focus and tracking control.

The system controller 17 manages the entire operation. In this system controller 17,
Input is given from the key 18. The keys 18 are the power key 2, the eject key 3, the play key 4, the pause key 5, the stop key 6, and the AMS key 7A on the front panel 1A.
And 7B, corresponding to the recording key 10. Further, the display 9 displays the time information such as the total playing time of the mini disk, the playing time of the song being played, the remaining playing time, and the track number of the song being played.

At the time of recording, an audio signal is supplied to the input terminal 21. This audio signal is digitized by the A / D converter 22 in 16 bits. The sampling frequency at this time is 44.1 kHz.

This digital audio signal is supplied to the audio compression encoder / decoder 23. The audio compression encoder / decoder 23 compresses the audio signal to about 1/5. A modified DCT (Modified Discreate Cosine Transform) is used as an audio signal compression technique.

The audio signal compressed by the audio compression encoder / decoder 23 is once stored in the DRAM 25 via the memory controller 24. DRAM25
Has a data capacity of 1 cluster or more (1 Mbit in this example). The output of this DRAM 25 is EF
It is supplied to the M / CIRC encoder / decoder 26.

The EFM / CIRC encoder / decoder 26 performs an error correction process on the recording data and performs EFM (8-14 modulation) on the error correction coded data. As an error correction code, CIRC (Cross I
nterleave Reed Solomon Code) is used.

The recording data formed in this way is
It is supplied to the recording magnetic head 13 via the head drive circuit 27. As a result, the magnetic field modulated by the recorded data is the disk 11B (magneto-optical disk) of the mini disk 11.
Applied to. Further, the laser beam from the optical pickup 14 is applied to the disc 11B of the mini disc 11. As a result, the disc 11B of the mini disc 11
Data is recorded magneto-optically.

Data recording is performed in cluster units. One cluster has 36 sectors, and one sector (corresponding to one subcode block of a compact disc) has 98 frames. This is because, at the time of data recording, it is necessary to control the laser power, and the interleaving length of CIRC is 108 frames, which is longer than the length of one sector, so that a linking area is required. 1
Of the clusters (36 sectors), the first 3 sectors are linking sectors. The next one sector is for sub data. Therefore, compressed data is recorded in 32 sectors of one cluster (36 sectors).

Further, the position on the disc at the time of recording is designated by the address wobble recorded in the groove provided along the track of the disc 11. The address recorded in the groove in the wobble is detected by the address decoder 28. The address detected by the address decoder 28 is the EFM / CIRC encoder /
It is supplied to the decoder 26.

At the time of reproduction, the recording signal of the disk 11B of the mini disk 11 is reproduced by the optical pickup 14.
The reproduction signal on the disk 11B is reproduced in cluster units. This reproduction signal is transmitted through the RF amplifier 29 to the EF.
It is supplied to the M and CIRC encoder / decoder 26. At this time, the optical pickup 14 reads the digital signal on the disk 11B at a transfer rate of 1.4 Mbit / sec. The digital signal from this disk 11 is
EFM and CIRC encoder / decoder 26 for EFM
It is demodulated and subjected to error correction processing.

The output of the EFM and CIRC encoder / decoder 26 is passed through the memory controller 24 to the DRA.
Once stored in M25. The output of the DRAM 25 is supplied to the audio compression encoder / decoder 23. The audio signal is expanded by the audio compression encoder / decoder 23.

The audio compression encoder / decoder 23
When data is obtained at 300 kbit / sec, it is possible to decompress and reproduce uninterrupted audio.
On the other hand, as described above, the optical pickup 14
Reads a digital signal on the disk 11B at a transfer rate of 1.4 Mbit / sec. 1M bit D
The RAM 25 is filled with the digital signal in about 0.9 seconds, and if the digital signal on the disk 11B cannot be read due to vibration or the like, the DRAM 2 remains in the DRAM 2 for about 3 seconds.
It is possible to continue outputting the reproduction signal by the data stored in 5. By re-accessing the optical pickup 14 to its original position and reading the signal again during that time, so-called sound skipping can be prevented.

The data decompressed by the audio compression encoder / decoder 23 is supplied to the D / A converter 30 and returned to an analog signal. This analog audio signal is output from the output terminal 31.

A TOC (Table Of Contentes) is provided on the innermost circumference of the disc 11B of the mini disc 11. In this TOC, information on what kind of data is recorded where on the disc 11B is recorded. Figure 3
Shows the structure of TOC. The TOC consists of a header area and a data area. The head of the header area is a fixed sync pattern area A1, followed by header information area A2 indicating clusters and sectors.

A fixed pattern area A3 is provided at the beginning of the data area, and an identifier indicating that the disk is a mini disk, disk type (reproduction-only, recordable, reproduction-only area and recordable area are mixed), recording An area A4 of identification information such as power, first track number, last track number, lead-out start address, used sector, power calibration start address, user TOC start address, and recordable user area start address is provided. Following this, track number points (P-
Areas A5 of TNO1, P-TNO2, P-TNO3, ...) Are provided. This track number point (P-
TNO1, P-TNO2, P-TNO3, ...) are pointers indicating the address of the information of the start address and end address of the track number. Following this,
An area A6 for track information is provided. In the track information area A6, information on the start address and end address of each track is recorded. The address of the information of the start address and the end address of each track is track number points (P-TNO1, P-TNO2, P-
TNO3, ...).

Further, the mini disk 11 is provided with a user TOC for managing the recorded audio signal. FIG. 4 shows the structure of the user TOC.
The user TOC has the same basic structure as the TOC described above. For the user TOC, the information of each track is linked to
-P (indicated by B1) information is included. This Li
nk-P indicates which track follows next. Therefore, it is not necessary to change the track order to change the song order. Track information management is
It can be done on the user TOC.

These TOC information are stored in a part of the DRAM 25 at the first access after the disk is mounted.
When updating the user TCO, this DRAM
25, the user TOC is updated, and the updated user TOC is recorded on the disc at the time of ejection, for example.

In such a mini disk recording / reproducing apparatus, it may be desired to confirm the recording state of the recorded audio signal. In one embodiment of the present invention, when the stop key 6 and the reproduction key 4 are pressed in the recording state, reproduction is started from the beginning of the audio signal recorded immediately before.

That is, FIG. 5 shows a flow of a state set when each key is pressed. As shown in FIG. 5, when the recording key 10 is pressed (step 51), the recording state is set. When the pause key 5 or the stop key 6 is pressed during recording (step 52 or 53), the recording state is stopped. Then, when the reproduction key 4 is pressed (step 54), reproduction is started from the beginning of the tune recorded immediately before (step 55). That is, immediately before, as shown in FIG. 6A, the recording key 51 is pressed at the recording start position T ₁ , and the stop key 6 or the pause key 5 is pressed at the recording end position T _2.
Is pressed and a series of audio signals M1 is recorded between positions T ₁ and T ₂ . Then, when the reproduction key 4 is pressed, as shown in FIG. 6B, the immediately preceding recording start position T
Return to ₁ and playback will start.

In FIG. 5, when the recording state is stopped in step 53 and the recording key 10 is pressed again (step 56), recording is restarted from the previous recording end position (step 57). That is, immediately before, as shown in FIG. 7A, the recording key 51 is pressed at the recording start position T ₁ , the stop key 6 or the pause key 5 is pressed at the recording end position T ₂ , and the positions T ₁ to T ₂ are changed. In between a series of audio signals M1
Is recorded. Then, when the recording key 10 is pressed, recording is continued from the recording end point T ₂ as shown in FIG. 7B.

As described above, when the stop key 6 and the reproduction key 4 are pressed in the recording state, the reproduction is started from the head of the audio signal recorded immediately before. For this reason,
It is possible to easily confirm the recording state of the song or voice recorded immediately before. The previous recording start point T ₁ and recording end point T ₂ are obtained from the track information of the user TOC shown in FIG. When the stop key is pressed in step 53, the start address and end address of the previously recorded song are immediately stored in the user TOC.

The user TOC can be stored in the memory until the disc is ejected, and when the disc is ejected, the final user TOC can be recorded on the disc. Also, the user TOC on the disc may be rooted each time a change or new data is added to the user TOC.

[0035]

According to the present invention, when the stop key and the reproduction key are pressed in the recording state, reproduction is started from the beginning of the audio signal recorded immediately before. Therefore, it is possible to easily confirm the recording state of the song or the voice recorded immediately before.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a schematic diagram used for explaining a TOC in one embodiment of the present invention.

FIG. 4 is a schematic diagram used for explaining a TOC in one embodiment of the present invention.

FIG. 5 is a flow chart used to explain an embodiment of the present invention.

FIG. 6 is a schematic diagram used to describe an embodiment of the present invention.

FIG. 7 is a schematic diagram used to describe an embodiment of the present invention.

[Explanation of symbols]

 1 Mini Disc Recording / Playback Device 11 Mini Disc 17 System Controller 23 Audio Compression Encoder / Decoder 25 DRAM

Claims (4)

[Claims] 1. When performing a series of recording operations on a recordable disc and starting a reproducing operation after finishing the series of recording operations, the head of the portion recorded by the latest series of recording is accessed. A disk recording / reproducing apparatus in which reproduction is started from the beginning of a portion recorded by the latest series of recording. 2. The disc recording / reproducing apparatus according to claim 1, wherein the recording start address and the recording end address are stored in a memory at the end of a series of recording operations, and the recording start address and the recording end address stored in the memory are recorded. A disc recording / reproducing apparatus adapted to access the beginning of a portion recorded by the latest series of recording. 3. The disc recording / reproducing apparatus according to claim 1, wherein the recording start address and the recording end address are stored in the disc at the end of a series of recording operations, and the recording start address and the recording end address recorded in the disc are recorded. A disc recording / reproducing apparatus in which the head of a portion recorded by the latest series of recording is accessed. 4. The disc recording / reproducing apparatus according to claim 1, wherein when the reproducing operation is once ended and the recording operation is restarted, the reproducing is started from the head music of the disc.