JP2000156044A - Audio reproducing device and audio reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promptly start the reproduction after the start of reproduction is instructed, while preventing the pause of sound. SOLUTION: When the instruction to start the reproduction of a track consisting of plural parts dispersedly stored in a mini-disk is received, data are successively read out from the top part and stored in a semiconductor memory which is a buffer memory. When the reproducing time from the top of the track to the end of the part starting the storage to the semiconductor memory exceeds the maximum search time required for the search to the outermost periphery of the disk from the innermost periphery, the reproduction of the data stored in the semiconductor memory is started. As for a track, on which the pause of sound occured in the past, the reproduction is arranged so as to start after the reproducing time from the top of the track to the end of the part starting the storage to the semiconductor memory exceeds twice of the maximum search time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a reproducing apparatus for reproducing information from a recording medium such as a mini-disc capable of recording audio information in a distributed manner.

[0002]

2. Description of the Related Art Conventionally, a read-only CD has been widely used as a recording medium for recording audio information.

In recent years, an optical disk capable of performing not only reproduction-only but also recording has been realized, and a recording apparatus which records on such an optical disk in the same disk format as a reproduction-only CD has been put into practical use. I have.

On a recordable optical disk, heat generated by irradiating a laser beam deforms the recording film or burns out the recording film to form a recording pit, which is used once. Write-once type that can only record and cannot be erased (Direct Read After Write = DRAW)
There is an optical disk.

On a recordable optical disk, laser light is used as a light source, an external magnetic field is applied to the magneto-optical disk from a position opposite to the light source, and recording is performed by changing the direction of perpendicular magnetization of the recording film. There is a so-called rewritable (Erasable-DRAW, magneto-optical) magneto-optical disc capable of repeatedly performing recording and erasing. Erasing of these rewritable magneto-optical disks is performed by applying a magnetic field opposite to that at the time of recording while applying a laser beam to the recording film and heating. Reproduction of information recorded on a magneto-optical disk is performed by reading the direction of a magnetic domain using a magneto-optical phenomenon called the Kerr effect. That is, when a linearly polarized laser beam is incident on the perpendicular magnetization film, the deflection surface of the reflected light slightly rotates left or right according to the direction of the magnetization, and this rotation is converted into a change in the amount of light by the analyzer. The information is reproduced by detecting.

An optical modulation method is known as one of the recording methods for such a rewritable magneto-optical disk. In the optical modulation method, when recording and erasing a magneto-optical disk, an N-pole or a S-pole magnetic field is generated from a position opposite to the laser beam with the magneto-optical disk in between.
Recording and erasing are performed by outputting a high-power laser beam during pit formation and a low-power laser beam during non-pit formation as in reproduction. The magnetic field at this time functions auxiliary during recording. In this light modulation method, it is impossible to perform overwriting in which information is directly written to a location where information is already recorded. Therefore, when writing information at a location where the information is recorded, it is necessary to erase the information and then record the information.

On the other hand, as one of the recording systems for such a rewritable magneto-optical disk, a laser beam is emitted at a constant power, and a magnetic field N
There is also known a magnetic field modulation method in which recording is performed by reversing the pole and the south pole. According to this magnetic field modulation method, overwriting is made possible by modulating and recording a magnetic field.

A magneto-optical disk called a mini-disk is a magneto-optical disk using a magnetic field modulation method that enables such overwriting and an audio compression / expansion technique.

The mini-disc is housed in a cartridge, the disc diameter is 64 mm, and the track pitch is
1.6 µm, capable of recording and reproducing audio data for up to 74 minutes, and the linear velocity of the disk during recording and reproduction is 1.2 ~
It is 1.4 m / sec. The audio signal performance of the mini-disc is such that the number of channels is stereo 2 channels, the frequency band is 5 to 20 kHz, the dynamic range is 105 dB, and the recording method is the magnetic field modulation method as described above. The signal format is a sampling frequency of 44.1 kHz, the modulation method is EFM (Eight to Fourteen Modulation) similar to CD, and the error correction method is ACIRC (Adaptive Cross Interleave Read-
Solomon Code). In addition, the audio compression method is the high-performance coding method ATRAC (Adaptive Transform Acoustic Cod
ing). In this ATRAC, audio data obtained by analog-to-digital conversion of audio is up to 11.
The audio data in each section is divided into M
The data is divided into multiple frequency bands by DCT (Modified Discrete Cosine Transform) operation, and data is decimated for each frequency band in consideration of human hearing characteristics, and audio data is reduced to about 1/5 Compress to data.

According to such a mini-disc, a recording density on the disc is the same as that of a CD, but a magneto-optical disc having a diameter of 64 mm, which is much smaller than that of a CD. 1kHz, 1
Audio data of the same quality as a 6-bit resolution CD
Can be recorded for the same recording / reproduction time.

Since the mini-disc is a rewritable magneto-optical disc or the like, one tune, ie, a part obtained by dividing a track, can be recorded in a discontinuous manner. For this reason, unlike a CD or the like, in which audio data that forms a track is recorded sequentially, when one song is played, the time between reading one part and starting reading the next part In addition, a search time for moving the optical pickup to the next block is required. Conventionally, the reproduction is performed in the following manner based on the search time so that the reproduced sound is not interrupted.

That is, the playback device is provided with a buffer memory for temporarily storing audio data read from the mini-disc. And from a minidisk, just like a CD
1. Read signals at a transfer rate of 4 Mbit / s. Here, it is sufficient that the demodulation of the compressed signal is performed at 0.3 Mbit / sec, so that an idle time occurs. Therefore, the audio data read from the minidisk at a transfer rate of 1.4 Mbit / s is stored in the buffer memory, and while processing this at 0.3 Mbit / s, the pickup is moved to the next part. Then, the reading of the audio data of the next block is started. Thereby, it is possible to prevent the sound of the reproduced signal from being interrupted due to the search time.

More specifically, for example, conventionally, in order to prevent a break in sound immediately after the start of track reproduction, audio data for a maximum possible search time is stored in a buffer memory in advance before reproduction of a track is started. In other words, even if the parts are separated as a plurality of parts on the innermost and outermost parts of the mini-disc, if the processing is performed at 0.3 Mbit / sec, the innermost part of the mini-disc will not be interrupted. Reproduction has been started after the amount of audio data required for processing has been stored in the buffer memory for at least the search time for the pickup to move from the circumference to the outermost circumference.

According to the technique described in Japanese Patent Application Laid-Open No. Hei 8-212695, a search time that occurs first after reproduction is started is predicted, and audio data in a buffer memory is processed at 0.3 Mbit / sec during the search time. Even so, the audio data of the first part of the track is read from the mini-disc and stored in the buffer memory as much as the buffer memory does not become empty, and then the reproduction of the mini-disc is started.

It should be noted that, in the case of a mini disk, UTC (User's
Table of Contents) Track configuration information such as the position of each part that constitutes the track of each track on the mini disk, in a specific area of the mini disk called
A track title, recording date and time, and the like are registered. The reproducing device sequentially reproduces the parts making up the track with reference to the UTOC.

[0016]

A technique for starting reproduction after storing an amount of audio data required for processing in a buffer memory for a search time or more for a pickup to move from the innermost circumference to the outermost circumference of the mini-disc. According to the method, it takes a long time from when the user instructs to start the reproduction to when the reproduction is actually started, so that the user may be uncomfortable.

Further, according to the technique described in Japanese Patent Application Laid-Open No. H8-212695, since only the search time that occurs first after the reproduction is started is considered, the sound is interrupted due to the search time that occurs thereafter. was there. Further, when the first part of the track is short, the sound may be interrupted because the first part does not include the amount to be stored in the buffer memory.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reproducing apparatus capable of starting reproduction immediately after a user's reproduction start instruction while preventing breaks in sound occurring after reproduction starts.

[0019]

In order to solve the above-mentioned problems, the present invention relates to a storage medium capable of dividing a track of audio data into a plurality of parts and storing each part discontinuously. A reading device for reading audio data from the storage medium, a buffer memory for storing the read audio data, and processing the audio data stored in the buffer memory to reproduce audio. A playback audio processing unit for outputting, and a control unit, wherein the control unit receives history information reading means for reading history information indicating a track in which a sound break occurred in the past, and received a playback start instruction for the history information. When the track is not indicated, the first time is set as the reference time, and when the track for which the reproduction start instruction is received from the history information is indicated, The first time longer than the time the second time and the reference time determining means and said reference time,
Read control means for sequentially reading audio data of each part from the head part to the last part of the track which has received the reproduction start instruction from the storage medium via the read means, and storing the audio data in the buffer memory; The playback time from the beginning of the track until the end of the part where the storage of audio data in the memory was started is
When the reference time is exceeded, output control means for causing the reproduced sound processing means to start processing audio data stored in the buffer memory, and during processing of audio data of the track by the output control means, An audio playback device comprising: a history information registration unit that updates the history information so as to indicate a track where a sound break occurs from the history information when audio data is lost in the buffer data. provide.

According to such an audio reproducing apparatus,
By appropriately setting the reference time to a time at which no sound break occurs after the start of the reproduction, when the storage of the part where the reproduction time from the beginning of the track to the end of the reproduction is equal to or longer than the predetermined reference time is started, Since the reproduction is started without waiting for the completion of the storage of the part, the reproduction can be promptly started while preventing the sound from being interrupted.
Also, at this time, the history of past sound breaks is stored, and for a track where a sound break occurs, the reference time, that is, the reproduction time of the part stored before the start of reproduction is increased to increase the reproduction time of the part. It is possible to start the reproduction more quickly for a track whose dispersion is not strong, and to delay the start of reproduction for a track where the dispersion of parts is strong and the sound is likely to be interrupted, so that the sound is not interrupted more.

Since the start of reproduction is determined for each part, the processing is easy and the load required for realizing the processing is small.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below by taking an example of application to a mini-disc recording / reproducing apparatus.

FIG. 1 shows a configuration of a mini disc recording / reproducing apparatus according to the present embodiment.

In FIG. 1, reference numeral 1 denotes a mini disk (hereinafter, referred to as "MD"). MD1 is housed in a cartridge,
When a cartridge is loaded into a mini-disc recording / reproducing device, the MD1 is placed above the turntable.
In the cartridge, the MD 1 is rotated by a spindle motor 6 on a turntable. The information recording surface of the MD1 is divided into a pit area and a groove area. When the optical pickup 2 moves to the innermost position (start position) of the MD1, the inner switch 7 is pressed and the microcomputer 21 is notified. The microcomputer 21 detects a pit area based on the start position. The optical beakup 2 is located below MD1, and the magnetic recording head 1 is above.
8 are arranged, and these are moved by the slide motor 5 in the radial direction of the MD1. The magnetic recording head 18 generates a magnetic field of N and S poles corresponding to the recording signal and gives the magnetic field to MD1. The servo circuit 4 performs spindle control of the spindle motor 6, slide control of the slide motor 5, focus control and tracking control of the optical pickup 2, laser control of a semiconductor laser in the optical pickup 2, and the like. The spindle control circuit in the servo circuit 4 is a CLV (Constant Linear Ve1ocit).
y) The control is performed, and the rotation of the spindle motor 6 is controlled to the number of rotations at which a predetermined linear velocity is obtained. Also, the servo circuit 4
Inside the slide motor control circuit, MD1 optical pickup 2
Controls the slide motor 5 that moves in the width direction of the optical pickup, and furthermore, the focus control circuit, the tracking control circuit, and the laser control circuit in the servo circuit 4 include an optical pickup.
2. Control of focus, tracking, semiconductor laser on / off, etc.

At the time of reproducing the MD1, the information recorded on the MD1 is read by the optical pickup 2, passes through the RF amplifier 3, and passes through the address decoder 8 and EFM (Eight to Fourteen Modulation).
/ ACIRC (Adaptive Cross Interleave Read So1omon Co
de) It is supplied to the decoder 9. Address decoder 8 is MD
The address information superimposed on the CLV control sine wave signal, which is a meandering guide groove (pre-groove) formed by a small amount, is detected and demodulated. Based on this output, the EFM / ACIRC decoder 9 records the EFM and ACIRC of the recorded information.
, And sends the demodulated data to the semiconductor memory control circuit 10 for vibration proof.

The semiconductor memory control circuit 10 stores the data input from the EFM / ACIRC decoder 9 for reproduction in a semiconductor memory 15 serving as a buffer memory. In addition, the semiconductor memory control circuit 10
Data is read from l5 and sent to an audio decompression decoder (ATRAC demodulation circuit) l1 to demodulate the compressed data. The audio expansion decoder 11 expands and demodulates the compressed data, sends the demodulated data to the D / A converter 12, and outputs audio.

On the other hand, at the time of recording, the input sound is A
After being converted to digital data by the / D converter 13, the data is converted to compressed data by an audio compression encoder (ATRAC modulation circuit) 14, and stored in the semiconductor memory 15 via the anti-vibration semiconductor memory control circuit 10. Semiconductor memory 15
When the amount stored in the memory reaches a predetermined amount, the semiconductor memory control circuit 10 reads out the compressed data stored in the semiconductor memory 15 and sends it to the EFM / ACIRC encoder 16. EFM / ACI
The RC encoder 16 modulates EFM and ACIRC, and outputs its output to the head drive circuit 17. The head drive circuit 17 applies a magnetic field to the MD1 via a magnetic recording head 18 that generates magnetic fields of N and S poles corresponding to the recording EFM signal. On the other hand, MD1
On the other hand, the optical pickup 2 arranged on the opposite side of the magnetic recording head 18 irradiates the MD 1 with a laser beam at a recording laser power (high power) supplied from the servo circuit 4 in accordance with a command from the microcomputer 21. A recording signal is recorded on the MD1 by a magnetic field from the recording head 18 sandwiching the MD1 and a recording laser beam emitted from the optical pickup 2. On the other hand, in order to move the optical pickup 2, a slide control signal from the microcomputer 21 is applied to the slide motor 5 via the servo circuit 4 and the optical pickup 2 is moved.
Make a move.

The microcomputer 21 is connected to the servo circuit 4, the EFM / ACIRC encoder 16, the semiconductor memory control circuit 10 for anti-vibration, and the non-volatile memory 22 via a bus. ,Playback,
In addition, it sends and receives control (management) data such as a command signal for performing all controls such as a search operation of the optical pickup 2 and a detection signal such as MD1 address information. The microcomputer 21 has a built-in volatile RAM 23.

In FIG. 1, a key unit 20 is an input device of the microcomputer 21 and has various operation keys and key blocks such as numeric keys. The display unit 19 is a display device such as a liquid crystal for displaying various data in accordance with an instruction from the microcomputer 21, and displays a table of contents information such as music pieces.

Here, according to the recording format of the track on the recording surface of the MD1, the MD1 is provided with a lead-in area, a UTC area, a user recording area for recording music and the like, and a lead-out area from the inner peripheral side. Can be Each area is roughly divided, and the lead-in area may be called a pit area, and the other areas may be called groove areas.

The operation of such a mini disc recording / reproducing apparatus at the time of starting reproduction will be described below.

First, when the MD1 to be reproduced is set in the mini disc recording / reproducing apparatus in the system, the microcomputer 21 operates the servo circuit 4 to read UTOC information from the MD1, and starts each track and each part. The address, the cluster of the end address, the sector, and the sound group are stored in the semiconductor memory 15.

When the reproduction of a track is instructed via the key 20, the microcomputer 21 performs a reproduction process described below.

FIG. 2 shows a processing procedure of the reproduction processing.

The reproduction process will be described first with reference to FIG.
A case where the parts of the track shown in (1) are not dispersed and a case where a plurality of parts of the track shown in FIG.

First, the case where the track parts in FIG. 3A are not dispersed will be described. FIG. 4A shows the operation timing in this case.

In the reproducing process, the microcomputer 21 first sets the comparison time T to the time required for searching from the innermost circumference to the outermost circumference of the disk, that is, the maximum search time in step S1.

Next, in step S2, the track 1 for which reproduction has been instructed is determined based on the identification information of the track in which the sound break occurred in the past indicated by the sound break history information stored in the non-volatile memory 22 during the past reproduction. It is determined whether or not the track has a break in the sound. Here, it is assumed that the identification information of the track 1 is not registered in the sound break history information stored in the nonvolatile memory 22.

If it is determined that the track has a break in the sound during the past reproduction, step S3
, The comparison time T is changed to twice the maximum search time, and the process proceeds to step S4. If it is determined that the track has never been interrupted during playback in the past,
Proceed directly to step S4. In this case, it is determined that the sound is not interrupted in the track 1 before, and the comparison time T
The process proceeds to step S4 while keeping the maximum search time.

In step S4, a search is performed for the head position A of track 1 for which reproduction has been instructed. This operation is performed at times 0 to 5 in (1) of FIG. Next, step S
At 5, the reading of the compressed data of the part (in FIG. 3A, the same as the track 1) recorded from the position A in FIG. 3A is started. This compressed data is stored in the semiconductor memory 15 as described above. Data recorded on this disk is stored in real time for each sector. This operation is performed starting from time 5 in (1) of FIG.

Next, in step S6, an extension time (reproduction time) from the beginning of track 1 to the end of the part whose storage in the memory was started in step S5 is derived based on the UTOC information previously stored. , Comparison time T. This operation is also performed starting at time 5 in (1) of FIG.

If the reproduction time is longer, the expansion is started in step S7. That is, data is sequentially read from the semiconductor memory 15, supplied to an audio decompression decoder (ATRAC demodulation circuit) 11 to demodulate the compressed data, and the operation of outputting audio via the D / A converter 12 is started. This operation is started from the time axis 8 in FIG.

As a result, in the case of FIG. 3A, since the parts of track 1 are not dispersed, the playback time of the compressed data of the first part (track 1) is longer than the maximum search time (comparison time T) of the disk. Is sufficiently long, so that decompression starts immediately after the memory starts.

Thereafter, in step S11, the parts of the track to be reproduced are sequentially read out and stored in the semiconductor memory 15 while expanding the data stored in the semiconductor memory 15 and outputting the sound. In addition, the occurrence of a break in the sound, that is, the occurrence of an event in which there is no data to be expanded in the semiconductor memory 15 before the end of the track expansion, is monitored. In the information, the identification information of the track being reproduced is registered if the identification information of the track has not been registered yet.

As described above, in the mini-disc recording / reproducing apparatus according to the present embodiment, the track parts are not dispersed as shown in FIG. 3A, that is, the search for the parts occurs immediately after the audio output. For a track in which the sound is not interrupted due to the absence of data to be expanded in the semiconductor memory 15, the audio output is immediately started.

Next, a case where a plurality of parts of the track in FIG. 3 (2) are dispersed on the inner circumference and the outer circumference will be described. The operation timing in this case is shown in FIG.

In this case, first, in the reproducing process, the microcomputer 21 sets the comparison time T to the time required for the search from the innermost circumference to the outermost circumference of the disk, that is, the maximum search time in step S1.

Next, in step S2, the track 1 to which reproduction has been instructed is determined in the past reproduction based on the identification information of the track in which the sound break occurred in the past indicated by the sound break history information stored in the nonvolatile memory 22. It is determined whether or not the track has a break in the sound. Here, it is assumed that the identification information of the track 1 is not registered in the sound break history information stored in the nonvolatile memory 22.

If it is determined that the track has a break in the sound during the past reproduction, step S3
, The comparison time T is changed to twice the maximum search time, and the process proceeds to step S4. If it is determined that the track has never been interrupted during playback in the past,
Proceed directly to step S4. In this case, it is determined that the sound is not interrupted in the track 1 before, and the comparison time T
The process proceeds to step S4 while keeping the maximum search time.

Next, in step S4, the head of track 1 (the head of part 1) is searched. This operation is shown in FIG.
It is performed from time 0 to 5 in (2).

Next, in step S5, FIG.
The reading of the compressed data of part 1 recorded from the position C and the storage in the semiconductor memory 16 are started. This operation is performed starting at time 5 in FIG.

Next, in step S6, based on the UTC information stored in the semiconductor memory 15, step S5
, The reproduction time of the compressed data of Part 1 whose storage has been started is derived and compared with the comparison time T. Now, FIG.
In (2), track 1 is divided into three parts,
It is assumed that the parts are distributed on the inner circumference and the outer circumference, and the reproduction time of the data obtained by adding the compressed data of Part 1 and the compressed data of Part 2 is shorter than the maximum search time. In this case, the comparison time T is longer than the reproduction time of the compressed data of Part 1.
Since (maximum search time) is longer, the process proceeds to step S8 without starting decompression and audio output. These operations are also shown in FIG.
It is performed starting from time 5 in (2).

Next, in step S8, the process waits until reading of the part 1 data from the semiconductor memory 15 is completed. This operation is performed between times 5 and 16 in FIG.

Next, in step S9, it is determined whether or not the next part of the track to be reproduced exists. If so, in step S10, the next part 2 is determined.
Of the first part F of the search is started. This operation is shown in Fig. 4 (2)
At time l6-33.

Next, returning to step S5, reading of the compressed data of part 2 from the searched position and storage in the semiconductor memory 15 are started. This operation is performed in the time shown in FIG.
It is performed starting from 33.

Next, based on the UTOC information, the reproduction time from the head part, ie, the head of the track to the end point of the currently stored part, is compared with the comparison time T. Therefore, in this case, the part 2 that started storing in step S5
Of the compressed data of Part 1 and the compressed data of Part 2 are compared with the comparison time T. Here, part l
Since the comparison time T (maximum search time) is longer than the reproduction time of the data obtained by adding the compressed data of Part 2 and the compressed data of Part 2, decompression and audio output do not start, and the process proceeds to Step S8. These operations are also performed starting at time 33 in FIG.

In step S5, the process waits until the memory of the compressed data of the current part 2 ends. This operation is time 33 ~
Done at 44.

Then, when the memory of the compressed data of the current part 2 is completed, it is determined in step S9 whether or not the next part of the track to be reproduced exists. Then, the search for the head part D of the next part 3 is started. This action is time 4
Done from 4 to 58.

Next, in step S5, storage of the searched compressed data of part 3 in the semiconductor memory 15 is started. This operation starts at time 58.

On the other hand, in step S6, the reproduction time of the compressed data of Part 3 is derived from the UTOC information, and the reproduction time of the compressed data of Part 1, the reproduction time of the compressed data of Part 2, and the reproduction time of the compressed data of Part 3 are derived. Is compared with the comparison time T. Here, since the sum reproduction time is longer than the comparison time T (maximum search time), in step S7, after the storage of the compressed data of part 3 is started, decompression and audio output are started. These operations are shown in FIG.
The process is performed starting from the time 58 of (2).

Thereafter, in step S11, the parts of the track to be reproduced are sequentially read out and stored in the semiconductor memory 15 while expanding the data stored in the semiconductor memory 15 and outputting the sound. In addition, the occurrence of a break in the sound is monitored, and if a break occurs, the identification information of the track being reproduced and the identification information of the track have not been registered in the break history information in the nonvolatile memory 22 yet. Register in case.

As a result of the above processing, the above-mentioned JP-A-8-2126
According to the technology described in Japanese Patent Application Publication No. 95, since only the search time that occurs first after the start of reproduction is considered as shown in FIG. When the compressed data to be processed is lost in the semiconductor memory 15 at the time when the compressed data of the part 2 is lost in 15, the output sound may be interrupted by sound. For example, as shown as decompressed audio output data A in FIG.
At time 105, when the compressed data of part 2 is exhausted in the semiconductor memory 15, storage of the compressed data of part 3 to be processed next in the semiconductor memory 15 is started.
The compressed data to be processed is not lost in the semiconductor memory 15 and the output sound is not interrupted.

For example, when the track is divided into a number of parts as shown in FIG. 5 and each part is strongly dispersed on the inner and outer circumferences, the comparison time T May be interrupted depending on the processing in which is set as the search time. For example, the track (T
r.1) is the playback target, and the playback time of the sum of the playback times of Part 1 to Part 4 is shorter than twice the maximum search time, and the playback time of the sum of the playback times of Part 1 to Part 5 is , Longer than the maximum search time. Also,
The playback time of the sum of the playback times from Part 1 to Part 2 is shorter than the maximum search time, and
The playback time of the sum of the playback times up to is longer than the maximum search time.

In this case, if the maximum search time is used as the comparison time T, the reproduction time of the sum of the reproduction times from Part 1 to Part 2 is shorter than the maximum search time, and
Since the playback time of the sum of the playback times from to is longer than the maximum search time, when the storage of part 3 is started, decompression and audio output are started. Since the recording of the compressed data of Part 7 in the semiconductor memory 15 has not been started at the time when the decompression of the compressed data of Part 6 and the output of the audio have been completed, the sound is interrupted.

Then, in such a case, step S1
In step 1, the identification information of the track where the
This is registered in the non-volatile memory 22 as interrupted history information.

However, in the present embodiment, as described above, the tracks registered in the sound-interruption history information, that is, the tracks in which the sound-interruption has occurred in the past, by the processing of steps S2 and S3 as described above. Since the twice maximum search time is used as the comparison time T,
Such a sound break does not occur for a track once registered in the sound break history information.

Hereinafter, the nonvolatile memory 2
The reproduction operation of the track in which the identification information is registered in the break history information 2 will be described.

In this case, in the reproduction process, the microcomputer 21 first sets the time required for searching from the innermost circumference to the outermost circumference of the disk, that is, the maximum search time as the comparison time T in step S1.

Next, in step S2, the track 1 for which reproduction has been instructed is determined based on the identification information of the track in which the sound break occurred in the past indicated by the sound break history information stored in the nonvolatile memory 22 during the past reproduction. It is determined whether or not the track has a break in the sound. Here, the identification information of the track 1 is registered in the sound break history information stored in the nonvolatile memory 22. Therefore, it is determined that the track has a break in the sound during the past reproduction, the comparison time T is changed to twice the maximum search time in step S3, and the process proceeds to step S4.

When the track (Tr. 1) shown in FIG. 5 is to be reproduced, the sum of the reproduction times of the parts 1 to 4 is shorter than the comparison time T (twice maximum search time). In step S6 of FIG. 2, the determination of yes is continued, and the decompression and audio output are not started, and the compressed data of parts 1 to 4 is stored in the semiconductor memory in steps S4, S5, S6, S8, S9, and S10. After being sequentially stored in step 15, the head of the next part 5 is searched in step 10.

Then, in step S5, part 5
Is started. As shown in FIG. 6, this operation is performed starting at time 66.

On the other hand, in step S6, the reproduction time of the data of part 5 whose storage has been started in step S5 is derived from the UTOC information, and the reproduction time of the sum of the reproduction times of parts 1 to 4 and the comparison time T ( (2 times the maximum search time). Here, the playback time of the sum of the playback times of parts 1 to 5 is longer than the comparison time T (double the maximum search time). Start audio output. These operations are also performed starting at time 66.

Thereafter, in step S11, the parts of the track to be reproduced are sequentially read out and stored in the semiconductor memory 15 while expanding the data stored in the semiconductor memory 15 and outputting audio. In addition, the occurrence of a break in the sound is monitored, and if a break occurs, the identification information of the track being reproduced and the identification information of the track have not been registered in the break history information in the nonvolatile memory 22 yet. Register in case.

As a result, even if the data of part 6 is lost at time l28, since the storage of the data of part 7 has already started at that time, the audio output can be continued without interruption.

The reproduction processing has been described above.

Next, in the above-mentioned reproduction processing, the identification information of the track registered in the non-speech history information of the nonvolatile memory 22 will be described.

In step S11, the identification information of the track to be registered in the break sound information is registered for each mini-disc. That is, the disc-specific information of the disc in which the sound is interrupted is registered in any of the stored tracks, and the disc-specific information is associated with the disc-specific information. The track-specific information of the track in which the sound is interrupted is registered. The track number and the track name obtained from UTOC are registered as the track-specific information, and the total number of tracks, the total playback time, the disk name, and the like recorded on the mini-disc obtained from UTOC are stored as the disc-specific information.

Then, in step S2, the track-specific information of the track whose reproduction is instructed is associated with the disc-specific information of the mini-disc on which the track whose reproduction has been instructed is recorded as the choppy history information. When registered, it is determined that the track instructed to start the reproduction is a track in which a sound break has occurred in the past.

Since the track identification information cannot be registered indefinitely due to the limitation of the storage capacity of the non-volatile memory 22, the interrupted sound history information of the non-volatile memory 22 is cleared by a user's instruction. You may do so. Alternatively, if the capacity becomes insufficient, the necessary amount, the disc-specific information and the track identification information associated with the disc may be deleted from the minidisk used last. .

The embodiments of the present invention have been described.

The above embodiment may be modified so that the sound break history information is registered in the RAM 23.
In this case, only the track-specific information may be registered as the track identification information in the break-in-sound history information, and the break-in-sounds history information may be cleared each time the mounted mini-disc is replaced.

Further, in the above embodiment, the sound break history information may be modified so as to be recorded on the mini-disc itself on which the track where the sound break occurs is recorded.

In this case, the UTC of the mini disc is
As a part of the disc name or track name to be recorded in the sub-record, it may be recorded whether or not the cut-off sound has occurred in the mini-disc or the track to record the cut-off sound history information. In other words, by including a specific character string including a specific character that is not generally used for a disc name or track name such as “ト ラ ッ ク D” in the disc name or track name, the sound is cut off to the mini disc or track. May be indicated. In this case, if a disc name or track name has already been recorded,
The specific character string is recorded. In this case, in step S11, the disc name of the UTC of the mini-disc in which any of the stored tracks has a discontinuity is rewritten to include the specific character string, and the name of the track in which the discontinuity occurs is specified. Rewrite to include the string Then, in step S2, the disc name or track name recorded in the UTOC of the mini disc to be reproduced is read out, and a track including a specific character string in the track name is a track in which sound interruption has occurred in the past. Is determined.

The above embodiment may be modified so that an appropriate time other than the maximum search time and the double maximum search time is used as the time used for comparison with the reproduction time in step S6.

As described above, according to the present embodiment, the storage of a part in which the reproduction time from the beginning of the track to the end of reproduction of the part is longer than the time determined based on the maximum search time so that the sound is not interrupted to some extent. Is started without waiting for the completion of this part, so that it is possible to start the reproduction promptly while preventing sound breaks. At this time, the history of past sound breaks is stored, and for a track in which a sound break occurs, the part dispersion time is increased by increasing the playback time of the part to be stored before starting playback, so that the dispersion of the parts is strong. Sound breaks can be prevented from occurring even on tracks that are likely to break. In addition, since such a reproduction start determination is performed for each part using the UTC information stored in the mini-disc, the processing is easy, and the processing load and the load for realizing the processing are small. .

The present embodiment is not limited to a mini disk, but may be applied to a reproducing apparatus for reproducing a storage medium in which tracks are divided and stored.

[0087]

As described above, according to the present invention, it is possible to provide a reproducing apparatus which can start reproduction immediately after a user's reproduction start instruction while preventing sound breaks occurring after reproduction starts. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mini disc storage / playback apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a procedure of a reproduction process according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of distribution of track parts.

FIG. 4 is a diagram showing operation timings in a reproduction process according to the embodiment of the present invention.

FIG. 5 is a diagram showing an example of distribution of track parts.

FIG. 6 is a diagram showing operation timings in a reproduction process according to the embodiment of the present invention.

[Explanation of symbols]

1 mini disk, 2 optical pickup, 3 RF amplifier, 4 servo circuit, 5 slide motor, 6 spindle motor, 7 inner switch, 8 address decoder,
9 EFM / ACIRC decoder, 10 semiconductor memory control circuit, 11 audio expansion decoder (ATRAC demodulation circuit),
12 D / A converter, 13 A / D converter, 14
Audio compression encoder (ATRAC modulation circuit), 15 semiconductor memory, 16 EFM / ACIRC encoder, 17 head drive circuit, 18 magnetic recording head, 19 display unit, 20
Key part, 21 microcomputer

Claims (7)

[Claims] 1. A reproducing apparatus for reproducing a storage medium capable of dividing a track of audio data into a plurality of parts and storing each part discontinuously, wherein audio data is read from the storage medium. Means, a buffer memory for storing the read audio data, a reproduction audio processing means for processing the audio data stored in the buffer memory and outputting audio, and a control unit. History information reading means for reading history information indicating a track in which a sound break occurred in the past; and when the history information does not indicate a track for which a reproduction start instruction has been given, a first time is set as a reference time, When the information indicates the track for which the reproduction start instruction is received, a second time longer than the first time is set as the reference time. And the reference time decision means, through said reading means,
Reading control means for sequentially reading out audio data of each part from the first part to the last part of the track which has received the reproduction start instruction from the storage medium, and storing the audio data in the buffer memory; and storing the audio data in the buffer memory. Output control for causing the playback audio processing means to start processing audio data stored in the buffer memory when the playback time from the beginning of the track until the end of the part where the playback is started exceeds the reference time. Means for updating the history information so as to indicate the track on which the sound interruption occurred from the history information when audio data is lost in the buffer data during processing of audio data of the track by the output control means. Audio reproduction having history information registration means for performing Location. 2. The audio reproducing apparatus according to claim 1, further comprising history information storage means for storing the history information. 3. The audio reproducing apparatus according to claim 1, wherein the history information indicating the track in which the skip has occurred in the past is stored in the storage medium for each storage medium in which the track in which the skip has occurred is recorded. An audio device characterized by being stored. 4. The audio reproducing apparatus according to claim 1, wherein the first time is a maximum time required for moving a reading position of a storage medium by the reading means. Wherein the second time is a multiple of the maximum time. 5. The audio reproducing apparatus according to claim 1, wherein the storage medium is a mini-disc, and the output control means of the control section is provided in a predetermined area of the mini-disc. Based on the stored UTOC information indicating the recording state of each track and each part, a reproduction time from the beginning of the track until the end of the part where the storage of the audio data in the buffer memory is started is calculated. Audio playback device. 6. A method for controlling reproduction in a reproduction apparatus for reproducing a storage medium capable of dividing a track of audio data into a plurality of parts and storing each part discontinuously, comprising: The history information indicating the track in which the sound is interrupted is read, and when the track for which the reproduction start instruction is received is not indicated in the history information, the first time is set as the reference time, and the reproduction start instruction is received in the history information. A first step in which, when a track is indicated, a second time longer than the first time is set as the reference time, a first part of the track being read from the storage medium via the reading means; From the audio data of each part to the last part of the track.
And the third step of processing the temporarily stored audio data and outputting the audio. The audio output of the track is interrupted due to the lack of the temporarily stored audio data during the processing of the audio data of the track. And a fourth step of updating the history information from the history information so as to indicate the track in which the sound break occurred, and the third step is performed by the second step. An audio playback method, wherein the playback is started when the playback time from the beginning of the track until the end of the part where the storage is started exceeds the reference time. 7. A reproducing apparatus for reproducing a storage medium capable of dividing a track of audio data into a plurality of parts and storing each part discontinuously, wherein the audio data of the track is partially stored from the storage medium. A track reproducing method for extracting audio data of a track from the buffer memory and reproducing the audio data while outputting the audio data of the track from a storage medium to the buffer memory after transferring the audio data of the track to a buffer memory. When the audio data temporarily stored during the playback of the audio data is lost, the track in which the sound to be output is interrupted is stored, and the track stored as the track in which the audio was interrupted in the past is recorded in the past. More tracks than tracks that are not stored as spawned tracks , After transferring the audio data to the buffer memory, the audio reproducing method characterized in that to start playing.