JP2000156045A - Device and method for reproducing audio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily start the reproducing after reproducing start is instructed while preventing a sound brake. SOLUTION: When the reproducing start of a track consisting of plural parts dispersedly stored in a mini-disk is instructed, the data are read out successively from a top part to be stored in a semiconductor memory being a read-out buffer memory. When the track is reproduced instantly, when a memory of a next part of a final part that the data to be reproduced does not exist in the semiconductor memory is started at a reproducing time, the data stored in the semiconductor memory are reproduced.

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 disk 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, audio data can be recorded and played back for up to 74 minutes, and the linear velocity of the disk during recording and playback is 1.2 ~
It is 1.4 m / sec. The performance of the audio signal 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-Solid).
lomon Code). The audio compression method is the high-performance coding system ATRAC (Adaptive Transform Acoustic Codin Codin).
g). In this ATRAC, audio data obtained by converting audio into digital data can be up to 11.6m.
The audio data of each section is divided into MDC
Classified into multiple frequency bands by T (Modified Discrete Cosine Transform) operation,
Data is thinned out for each frequency band in consideration of human auditory characteristics, and the audio data is compressed to about one-fifth.

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.

Specifically, for example, conventionally, in order to prevent a sound skip immediately after the start of track reproduction, audio data for a maximum possible search time is stored in a buffer memory in advance before the start of track reproduction. That is, even if the parts are separated as a plurality of parts on the innermost and outermost circumferences of the mini-disc, so that the sound is not interrupted,
When processing is performed at 0.3 Mbit / s, the amount of audio data that requires processing for at least the search time for the pickup to move from the innermost circumference to the outermost circumference of the minidisk is stored in the buffer memory, and then playback is started. Was.

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, as long as the buffer memory is not emptied, the audio data of the first part of the track is read from the minidisk and stored in the buffer memory, and then the reproduction of the minidisk is started.

It should be noted that, in the case of a mini disk, UTC (User's
(Table Of Contents) area, a specific area of the mini-disc, track configuration information such as the position on the mini-disc of each part constituting each track,
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]

According to the technique of starting reproduction after storing in the buffer memory an amount of audio data requiring processing for a search time or more for the pickup to move from the innermost circumference to the outermost circumference of the mini-disc. However, since it takes a long time from when the user instructs to start the reproduction to when the reproduction is actually started, 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 achieve the above object,
The present invention is, for example, an audio reproducing apparatus that divides a track of audio data into a plurality of parts and reproduces a storage medium capable of storing each part discontinuously. The control means comprising: reading means for reading; buffer memory for storing the read audio data; reproduction sound processing means for processing the audio data stored in the buffer memory and outputting sound; and a control unit. The section, from the storage medium, from the first part to the last part of the track that has received the reproduction start instruction, via the reading means,
A read control unit for sequentially reading audio data of each part and storing the audio data in the buffer memory; and immediately after storing the audio data in the buffer memory of the track for which the reproduction start instruction has been received at the start of the processing of the part by the reproduction audio processing unit. In the case where the reproduced audio processing means starts processing of the audio data stored in the buffer memory, if there is a sound cutoff part, which is a part in which the audio data to be processed no longer exists in the buffer memory, In the playback, the next part of the part with the last part of the sound break part is calculated as the playback start part, and if there is no sound break part, the part with the first order is calculated as the playback start part. Start part calculation means, and a reproduction start part calculated by the reproduction start part calculation means. An output control means for causing the reproduced sound processing means to start processing audio data stored in the buffer memory when the storage in the buffer memory is started. provide.

According to such an audio reproducing apparatus,
When the reproduction of the track is started immediately, at the start of the processing of the part, since the audio data to be processed does not exist in the buffer memory, the storage of the part next to the last part where the sound is interrupted is started. Since the reproduction is started at the point in time, it is possible to prevent the occurrence of a break in the sound. In addition, when there is no part where such a sound break occurs, the reproduction is immediately started, so that the reproduction can be started promptly while preventing the sound break.

[0021]

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 the NS pole corresponding to the recording signal and supplies it 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 Velocit
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 reproduction of 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 Solomon 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 data input from the EFM / ACIRC decoder 9 for reproduction in a semiconductor memory 15 which is a buffer memory. In addition, the semiconductor memory control circuit 10
The data is read from 15 and sent to an audio decompression decoder (ATRAC demodulation circuit) 11 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 semiconductor memory control circuit 10 for vibration proof. Semiconductor memory 15
When the amount of data 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 each part of the servo circuit 4, the EFM / ACIRC encoder 16, and the semiconductor memory control circuit 10 for vibration proof via a bus. These parts are used for recording, reproducing, and optical pickup.
It sends and receives control (management) data such as a command signal for performing all controls such as search operation 2 and a detection signal such as MD1 address information. In the figure, a key unit 20 is an input device of the microcomputer 21 and has key blocks such as various operation keys and 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 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.

Now, when a track is recorded in a plurality of parts, in order to prevent a skip between the n-th part and the (n + 1) -th part, the (n + 1) -th part is reproduced. At the start (when playback of parts 1 to n ends)
In addition, it is necessary to start reading (trace) of the (n + 1) th part. For this purpose, the trace from the (1) to the (n) th part and the n (n) One search from the end position of the n-th part to the start position of the (n + 1) -th part must be completed. The time required to complete the tracing of the parts from the 1st to the nth part is the time required to trace each part from the 1st to the nth part and the search time to the 1st to the 2nd part The search time is the sum of n-1 search times, such as the search time from the second to the third part,..., The search time from the (n-1) th to the nth part.

Therefore, the condition under which no sound skip occurs between the n-th part and the (n + 1) -th part is that the reproduction time of the first to n-th parts> the n-th search time + 1 to the n-th part Trace time up to Here, the search time of each search is less than the time required for the search from the innermost circumference to the outermost circumference of the disc, which is the maximum value that the search time can take, that is, the maximum search time. Even if the playback time of the first to nth parts> the maximum search time of n times +1 and the trace time of the nth part are satisfied, the sound is played at the (n + 1) th part. No jumps occur.

Therefore, in the present reproduction processing, the traced (1 to n-th) parts are stored in memory until the trace of the last (n + 1) -th part which does not satisfy this condition is started. When the tracing of the subsequent (n + 1) -th part is started, the occurrence of skipping is eliminated by starting the actual reproduction.

The details of the main reproduction process will be described below.

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

Hereinafter, this reproduction processing will be described with reference to FIG.
The case where the parts of the track shown in FIG. 3 are not dispersed and the case where a plurality of parts of the track shown in FIG.

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

In the reproducing process, when the microcomputer 21 is instructed to start reproducing a track, first, in step S1, the microcomputer 21 initializes a variable n to 0 and a variable x to 0. Then, n is set to 0 until the maximum number of parts of the reproduction start instruction track obtained from UTOC is -1 (step S5).
While sequentially increasing by one (step S4).
It is determined whether or not the above-mentioned condition (1) the reproduction time of the parts from the nth to the nth> the maximum search time for n times + 1 and the trace time from the nth to the nth part are satisfied (step S2) and increase n Then, every time a value of n that does not satisfy the above condition is detected, the value of the variable x is changed to the detected value of n (step S3). However, in step S2, when n is 0, it is assumed that the above condition is satisfied. In addition,
The playback time of each part is determined by the data size of the part obtained from UTOC x the playback rate.
It can be calculated by multiplying the data size of the part obtained from UTOC x the trace rate.

As a result, finally, the largest value of n which does not satisfy the above condition among the values from 1 to the maximum number of parts -1 is substituted for x. However, 1 to the maximum number of parts -1
If the above condition is satisfied for all of the values up to, x remains at the initial value 0.

In the case of FIG. 3A, since there is only one part, the determination in step S2 is performed only for n = 0, and n
Is 0, it is assumed that the above condition is satisfied, and the process proceeds to the next step S6 while the variable x remains 0.

Then, a search is performed for the n-th (here, first) part of track 1 (in this case, the first position A of track 1) for which reproduction has been instructed in step S7. This operation is performed at times 0 to 5 in (1) of FIG. Next, in step S8, the searched part (FIG. 3)
In the case of (1), the reading of the compressed data of the track 1 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 steps S9 and S10, whether the variable n matches the maximum number of parts,
It is checked whether or not the variable n matches X + 1, and if any, expansion is started in step S14. That is, data is sequentially read from the semiconductor memory 15 and 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 the track 1 are not dispersed, the decompression is started immediately after the memory of the track 1 is started.

Thereafter, in step S15, 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 sound.

As described above, in the mini-disc recording / reproducing apparatus according to the present embodiment, as shown in FIG. 3A, track parts are not dispersed, that is, a search for parts occurs immediately after audio output. If there is no interruption in the sound due to the absence of data to be expanded in the semiconductor memory 15, the sound output is started immediately after the start of the memory of the first part of the track.

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.

As described above, when the audio output is started immediately after the start of the memory of the first part of the track as shown as the expanded audio output data 2 in FIG. If there is no data to be decompressed in the semiconductor memory 15 at the start of the reproduction of the part 3 and a sound skip occurs, 2 is substituted for the variable x as a result of the processing of the above-described steps S1 to S5.

After setting the variable n to 1 in step S6, in step S7 the head of track 1 (part 1
Search). This operation is performed at times 0 to 5 in (2) of FIG.

Next, in step S8, the process shown in 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 steps S9 and S10, it is determined whether the variable n matches the maximum number of parts or whether the variable n matches X + 1. , X = 2, which is neither, so that the process proceeds to step S11 without starting decompression and audio output. These operations are also performed starting at time 5 in FIG.

Next, in step S11, 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 S12, the value of n is incremented by one, and in step S13, a search for the head portion F of the next part 2 is started. This operation is performed at times 16 to 33 in FIG.

Next, returning to step S8, 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, in steps S9 and S10, it is determined whether the variable n matches the maximum number of parts or whether the variable n matches X + 1.
Since the maximum number of parts is 5, x = 2 and neither of them,
The process proceeds to step S11 without starting decompression and audio output.
These operations are also performed starting at time 33 in FIG.

In step S11, the process waits until the memory of the compressed data of the current part 2 ends. This action takes time 33
Performed at ~ 44.

When the memory of the compressed data of the current part 2 is completed, n is incremented by 1 in step S12, and the search for the head D of the next part 3 is started. This operation is performed between times 44 and 58.

Next, in step S8, 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 steps S9 and S10, it is determined whether the variable n matches the maximum number of parts or whether the variable n matches X + 1.
Since the maximum number of parts is 5, x = 2, and the variable n matches X + 1, in step S14, after the storage of the compressed data of part 3 is started, decompression and audio output are started. These operations are performed starting at time 58 in FIG.

Thereafter, in step S15, 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.

As a result of the above processing, the above-mentioned JP-A-8-2126
According to the technique described in Japanese Patent Application Publication No. 95, as shown as expanded audio output data B in FIG. 4 (2), only the search time that occurs first after the start of reproduction is considered, so that the semiconductor memory 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. Fig. 4
As shown in (2) as decompressed audio output data A, when the compressed data of part 2 is exhausted in the semiconductor memory 15 at time 105, the compressed data of part 3 to be processed next is transferred to the semiconductor memory 15. Since the storage is started, the compressed data to be processed is not lost in the semiconductor memory 15 and the output sound is not interrupted.

The embodiments of the present invention have been described above.

As described above, according to the present embodiment, since the audio data to be processed no longer exists in the buffer memory, when the storage of the last part where the sound is interrupted is started, Since the reproduction is started, it is possible to prevent the occurrence of a break in the sound. In addition, when there is no part where such a sound break occurs, the reproduction is immediately started, so that the reproduction can be started promptly while preventing the sound break.

In the above embodiment, the reproduction time of the first to n-th parts> the maximum search time of n times + 1 + the tracing time of the first to n-th parts does not satisfy the following. Although the actual playback is started after the memory of the part is started, this may be modified as follows.

That is, for n between 1 and the maximum number of parts-1, the condition of the reproduction time of the first to n-th parts> the maximum search time of n times + 1 and the trace time of the first to the n-th parts is as follows. If there are n that do not satisfy the condition, for each n that does not satisfy the condition, (the maximum search time of n times + the trace time from the 1st to the nth part)-the playback time of the part from the 1st to the nth part , And the largest one is set as the preceding processing time.

Then, after the data is stored in the semiconductor memory 15 for at least the preceding processing time, the reproduction is started.

Then, the condition that no sound skip occurs between the n-th part and the (n + 1) -th part is as follows: the reproduction time of the parts from 1 to n> the maximum search time of n times + 1 to the n-th part According to the preceding processing time obtained as described above, this condition is always satisfied, so that no sound skip occurs. Further, it is possible to realize a smaller amount of memory and a quicker reproduction start than in the embodiment.

Specifically, for example, if the memory of the smallest k-th part that satisfies the following equation: trace time from k-1 times of maximum search time +1 to k-th part> preceding processing time, reproduction is completed. To start. More strictly, the memory of the smallest j-th data of the smallest k-th part that satisfies the following equation: trace time from k-1 maximum search time + 1 to j-th data of the k-th part> preceding processing time When is completed, start playback.

In the above embodiment, the setting of each condition and the determination of the condition are performed by applying the maximum search time as the search time of each search, but the search time actually required for each search is obtained from the UTC. The search time calculated from the arrangement may be used for setting each condition and determining the condition as a search time for each time.

In the above embodiment, the case where one track is reproduced has been described as an example. However, in the above embodiment, the case where a plurality of tracks are continuously reproduced or the whole mini disc is reproduced is described. The same can be applied to the case. That is, in any case, all the parts to be reproduced may be regarded as parts constituting one track, and the reproduction processing may be applied. Also, such determination of the reproduction start is performed for each part by the UT stored in the mini-disc.
Since the processing is performed using the OC information, the processing is easy, and the processing load and the load for realizing the processing are small.

The above-described embodiment is not limited to a mini-disc, and may be applied to a reproducing apparatus for reproducing a storage medium in which tracks are divided and stored.

[0072]

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.

[Explanation of symbols]

1 mini disk, 2 optical pickup, 3 RF amplifier, 4 servo circuit, 5 slide motor, 6 spindle motor, 7 inner circumference switch, 8 address decoder,
9 EFM (Eight to Fourteen Modulation) / ACIRC (Ad
aptive Cross Interleave Read (So1omon Code) decoder, 10 semiconductor memory control circuit, 11 audio expansion decoder (ATRAC return 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 unit, 21 microcomputer

Claims (5)

[Claims] 1. An audio reproducing apparatus which divides a track of audio data into a plurality of parts and reproduces a storage medium capable of storing each part discontinuously, wherein the audio data is read from the storage medium. A reading unit, a buffer memory for storing the read audio data, a reproduction sound processing unit for processing the audio data stored in the buffer memory and outputting a sound, and a control unit. Reads audio data of each part from the storage medium through the reading means, sequentially from the first part to the last part of the track for which the reproduction start instruction is received,
Reading control means for storing in the buffer memory; and at the start of processing of the part of the reproduction audio processing means, immediately after storing the audio data in the buffer memory of the track for which the reproduction start instruction has been received, the reproduction audio processing means When the processing of the audio data stored in the buffer memory is started, if there is a sound cut-off part, which is a part where the audio data to be processed no longer exists in the buffer memory, a part of the sound cut-off part A reproduction start part calculating means for calculating a part next to the part in the last order as a reproduction start part, and calculating a first part in the order as a reproduction start part when there is no interrupted part; The storage of the reproduction start part calculated by the calculation means in the buffer memory is started. To come, the audio reproducing apparatus, characterized in that the playback sound processing means, and an output control means for starting the processing of the audio data stored in the buffer memory. 2. The audio reproducing apparatus according to claim 1, wherein the reproduction start part calculating means stores the part from the head of the track to a part before the part before the reproduction start of the timed part. The sum of the time required to read from the medium and store the data in the buffer memory and the time required to move the read position of the storage medium by the reading means due to the change of the read part before the reading of the part is started is calculated. An audio reproducing apparatus, wherein a large part is calculated as the discontinuous part. 3. The audio reproducing apparatus according to claim 1, wherein the storage medium is a mini-disc, and the reproduction start part calculating means stores the mini-disc in a predetermined area of the mini-disc. UTOC indicating the recording status of the track and each part
An audio playback device, wherein the playback start part is calculated based on information. 4. 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. Via the readout means, from the storage medium, read the audio data of each part sequentially from the first part to the last part of the track that has received the reproduction start instruction,
Reading control means for storing the data in the buffer memory, and immediately after storing the audio data in the buffer memory of the track which has received the reproduction start instruction, causing the reproduction audio processing means to start processing the audio data stored in the buffer memory. In this case, the pre-processing time for calculating the maximum non-negative value as the pre-processing time among the time obtained by subtracting the start of storing the part in the buffer memory from the start of processing of each part of the reproduction audio processing means. Calculating means for storing the audio data in the buffer memory by the read control means after the preceding processing time calculated by the preceding processing time calculating means, and then storing the audio data in the reproduced sound processing means in the buffer memory. Output control means for starting the processing of the selected audio data. Audio playback device with. 5. An audio reproducing method for controlling reproduction in 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, comprising: A first step of sequentially reading and temporarily storing audio data of each part from the first part of the track for which the reproduction start instruction is received to the last part of the track from the storage medium via the reading means; A second step of processing the audio data and outputting the audio; and starting the processing of the audio data in the second step immediately after starting the temporary storage of the audio data of the track for which the reproduction start instruction has been received at the start of the processing of the part. Event that audio data to be processed has not yet been temporarily stored. If there is a discontinuous part, the next part of the last part of the discontinuous part is the playback start part.If there is no discontinuous part, the first part is the playback start part. A third step of calculating, wherein the second step is started when temporary storage of the playback start part calculated in the third step is started. Method.