JP2001236769A - Recorded medium reproducing method, and recorded medium reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorded medium reproducing method and a recorded medium reproducing device by which data to be reproduced never be interrupted. SOLUTION: When sound data corresponding to plural tracks is accumulated and reproduced based on the normal reproduction order in a shock-proof memory 15 being a FIFO memory and repeat having the order being different from the normal reproduction order is specified, sound data of a track to be reproduced successively in a normal reproduction order is deleted from the shock- proof memory 15, data of a reproduced track is read again by a pickup 12, accumulated in the shock-proof memory 15, accumulated sound data is read out continuously, and reproduced. Thereby, even if a read-out error exists, a reproducing method for sound data without interruption can be obtained. Also, even if not repeat but random reproduction is specified, in the same way, a reproducing method without interruption can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproducing method and apparatus for reading data recorded on a recording medium, temporarily storing the data in an intermediate memory, and then reproducing the data.

[0002]

2. Description of the Related Art In recent years, in a recording medium reproducing apparatus for reading data from a recording medium and then reproducing the data, in order to cope with interruption of data reproduction caused by a reading error or the like when reading data from the recording medium, the recording medium is reproduced. 2. Description of the Related Art There is known a recording medium reproducing apparatus for temporarily storing data read from an intermediate memory in an intermediate memory, and then reading the data stored in the intermediate memory and reproducing the data.

As an example of a conventional recording medium reproducing apparatus, in a reproducing apparatus for a recording medium in which the recording medium to be reproduced is an optical disk such as a music CD and the recorded data is sound data such as music data, A case where the memory is a shock-proof memory will be described.

[0004] The optical disk rotates at a predetermined rotation speed, and a pickup serving as a read head moves to a predetermined reading position and reads sound data in order to read sound data recorded on the optical disk.

The sound data read by the pickup is temporarily stored in a shock-proof memory having a predetermined storage capacity, and is read out from the shock-proof memory after a predetermined storage time. This shock-proof memory is, for example, a first-in first-out (F
Since the memory is an IFO) memory, the sound data stored in the shock-proof memory is read out and reproduced in the same order as the stored order.

Therefore, even if the reading of the sound data from the optical disk temporarily fails (read error) due to the recording medium reproducing device or the pickup itself being subjected to vibration or the like or dust attached to the optical disk, the shock proof is obtained. Since a predetermined amount of sound data is stored in the memory before the time of the reading error, the sound data read from the shock proof memory is interrupted until the time when the amount of sound data stored at that time is completely read out. Continue to play without.

While the sound data is being read from the shock proof memory, the pickup re-reads the sound data at the position where the reading error occurred, and starts to store the sound data in the shock proof memory again. Therefore, even if a reading error as described above occurs, the shock-proof memory for temporarily storing the sound data read from the optical disk is provided, so that the reproduced sound data is not interrupted.

[0008]

However, in the conventional recording medium reproducing apparatus, when the sound data in the shock proof memory as the intermediate memory is deleted, all the stored sound data can only be deleted at once. Therefore, the problem described below has arisen.

Many optical discs such as music CDs have a plurality of pieces of music, chapters, and the like, in which a single optical disc is divided into a plurality of areas (tracks) of sound data. Therefore, in the shock proof memory for temporarily storing the sound data read from the optical disc, for example, the sound data at the end of the first music and the sound data at the beginning of the second music to be reproduced next are stored. May be considered.

FIG. 8 shows the storage state of sound data in the shock proof memory at this time. Here, the shock proof memory is a FIFO memory,
The right vertical axis relates to an address indicating an absolute position of the shock proof memory, and the left vertical axis relates to a boundary address indicating a boundary position of sound data stored in the shock proof memory. In the figure, the address range of the sound data at the end of the first music is from address 0 to address 4 (boundary address ADR1), and the address range of the sound data of the first part of the second music stored at this time. Are addresses 4 to 7 (boundary address ADR2). The sound data read from the optical disk is stored in the shock proof memory, and is output and reproduced in the order of storage from the sound data at address 0 on the vertical axis.

When the sound data at the end of the first music and the sound data at the beginning of the second music to be reproduced next are stored in the shockproof memory, for example, the third music is reproduced after the first music being reproduced. Consider a case where an instruction to change the playback order is made to perform playback. In this case, only the memory control of whether or not all the sound data in the shock proof memory is deleted can be performed, so that the following two kinds of sound data can be reproduced.

First, when deleting all sound data in the shock proof memory, the address FU starts from address 0.
LL (last address of shock proof memory)
That is, the entire address range of the shock proof memory is specified, and all sound data is deleted. In this case, since no sound data is left in the shock proof memory, the end portion of the deleted first music is not reproduced as it is. Therefore, the sound data corresponding to the end portion of the deleted first music is read from the optical disk again by the pickup, stored in the shock proof memory, and simultaneously outputted and reproduced. In this case, while the pickup moves again to the position of the sound data corresponding to the end of the first song on the optical disk, there is no sound data stored in the shock proof memory, so that the reproduction is interrupted and a silent state is set. This causes sound skipping.
Further, if a reading error occurs after the movement of the pickup is completed, the optical disk must be read again, and the silent state becomes longer.

Next, when the sound data in the shock proof memory is not deleted, no sound skip occurs because there is sound data in the shock proof memory, and no silence occurs even if there is a reading error. However, since the sound data at the beginning of the second music has not been deleted, the sound data at the beginning of the second music is reproduced during the reproduction of the third music after the end of the first music. A part of the tune different from the reproduction order that has been performed is reproduced. When the capacity of the shock proof memory capable of storing the sound data is large enough to store all the sound data of the second music piece, or short enough to store the whole sound data of the second music piece. Means that all of the second songs are reproduced, and the order of the intended songs is not achieved.

Therefore, when it is desired to delete only the sound data relating to the second music stored in the shock proof memory,
Since the address for designating only the sound data relating to the second music could not be specified, the whole sound data stored in the shock proof memory is collectively specified as described above, and then the whole sound data is deleted or the whole sound data is deleted. Either method was not used to delete the data, and each had a problem.

The present invention has been made in view of such circumstances, and has as its object to provide a recording medium reproducing method and a recording medium reproducing apparatus in which data to be reproduced is not interrupted.

[0016]

According to a first aspect of the present invention, there is provided a recording medium reproducing method for reading data recorded on a recording medium divided into a plurality of data areas and temporarily storing the data in an intermediate memory. In the recording medium reproducing method of storing the data temporarily and reading out the data temporarily stored in the intermediate memory, and then reproducing the data, the reading unit performs the reproduction based on a first reproduction order specified in advance for each of the data areas from the recording medium by the reading unit. The data is sequentially read out, the read out data is signal-processed by a signal processing unit, and the data for each of the signal-processed data areas is stored in the intermediate memory in a plurality, and the data is stored in the intermediate memory. When reading and reproducing data based on the first reproduction order, a second reproduction order different from the first reproduction order is designated. After the data area being read and reproduced from the intermediate memory, an address range of data relating to the data area to be read and reproduced according to the first reproduction order is specified, and the data specified by the address range is read from the intermediate memory. The data is sequentially read out from the recording medium by the reading unit based on the second reproduction order, and the read data is signal-processed by the signal processing unit and stored in an intermediate memory. After reading and reproducing the data area being reproduced from the memory, the data stored in the intermediate memory is read and reproduced based on the second reproduction order.

According to this recording medium reproducing method, when the second reproduction order is designated, the data area read out and reproduced according to the first reproduction order after the data area read out from the intermediate memory and being reproduced. Since data is deleted by specifying the address range, next to the data area being played,
The data relating to the data area to be read and reproduced according to the first reproduction order is not reproduced. Further, even if a reading error occurs in the data area being reproduced, the reproduction is not interrupted because the data is stored in the intermediate memory. After reproducing the data area of the intermediate memory being reproduced, the data specified in the second reproduction order can be reproduced continuously.
Also, the data itself specified in the second reproduction order is stored in the intermediate memory and then reproduced, so that reproduction is not interrupted.

In the recording medium reproducing method according to the second aspect, the second reproduction order is designated, and when the address range is designated, the last data stored last in the intermediate memory by the signal processing circuit is designated. Obtain an address, convert the elapsed time data for each data area included in the last accumulated data into a data amount, calculate a region head address which is traced back from the last address by the data amount, and calculate the region head address from the region head address. The address range up to the last address is designated as the address range.

According to this recording medium reproducing method, when data in the data area to be deleted is deleted from the intermediate memory,
Since the area start address is calculated from the data amount converted from the elapsed time data and the address range is specified by the last address, the address can be accurately specified by the elapsed time data and the last address.

According to a third aspect of the present invention, data recorded on a recording medium divided into a plurality of data areas is read out, temporarily stored in an intermediate memory, and temporarily stored in the intermediate memory. In a recording medium reproducing apparatus for reading and reproducing the data, a reading unit for sequentially reading the data from the recording medium based on a first reproduction order specified in advance for each of the data areas; A signal processing unit for performing signal processing, an intermediate memory for storing a plurality of the data for each of the signal-processed data areas, and reading and reproducing the data stored in the intermediate memory based on the first reproduction order. When a second reproduction order different from the first reproduction order is specified, the data is read from the intermediate memory and the subsequent data area is being reproduced. Specifying an address range of data relating to a data area to be read and reproduced according to the first reproduction order, deleting the data specified by the address range from the intermediate memory, and then reading the data from the recording medium by the reading unit. Reading the data sequentially based on a second reproduction order, the read data is subjected to signal processing in the signal processing unit and stored in an intermediate memory;
After reading and reproducing the data area being reproduced from the intermediate memory, the control unit reads and reproduces the data stored in the intermediate memory based on the second reproduction order.

According to this recording medium reproducing apparatus, when the second reproduction order is designated, the control section reads and reproduces the data area from the intermediate memory in accordance with the first reproduction order after the data area being read and reproduced. The data relating to the data area is deleted by specifying the address range. Therefore, data related to the data area to be read and reproduced according to the first reproduction order after the data area being reproduced is not reproduced. Further, even if a reading error occurs in the data area being reproduced, the reproduction is not interrupted because the data is stored in the intermediate memory. Further, after the data area of the intermediate memory being reproduced is reproduced by the control unit, the data specified in the second reproduction order can be continuously reproduced.
Since the data itself specified in the reproduction order is stored in the intermediate memory and then reproduced, the reproduction is not interrupted.

5. The recording medium reproducing apparatus according to claim 4, wherein the control unit obtains the last address of data last stored in the intermediate memory by the signal processing circuit, and stores the last address of the data stored in the last stored data. After converting the elapsed time data for each area into a data amount, calculate an area start address which is traced back from the last address by the data amount, and specify an address range from the area start address to the last address as the address range. It is characterized by having a designation unit.

According to this recording medium reproducing method, when data in the data area to be deleted is deleted from the intermediate memory,
The control unit calculates the area start address from the data amount obtained by converting the elapsed time data, and specifies the address range by the last address. Therefore, the address can be accurately specified by the elapsed time data and the last address.

According to a fifth aspect of the present invention, in the recording medium reproducing apparatus, one of the first reproducing order and the second reproducing order is an order in which an arbitrary data area is repeatedly read and reproduced. There is a feature.

According to this recording medium reproducing apparatus, the first
Since the reproduction order of at least one of the second reproduction order and the second reproduction order is an order of repetitive reproduction, even if the reproduction order is switched from a certain reproduction order to an order of repeated reproduction, the reproduction order is not changed. Even when switching to a certain reproduction order, data can be reproduced without interruption.

According to a sixth aspect of the present invention, in the recording medium reproducing apparatus, either one of the first reproducing order and the second reproducing order is an order of reading and reproducing at random. I do.

According to this recording medium reproducing apparatus, the first
Since the reproduction order of at least one of the second reproduction order and the second reproduction order is a random reproduction order, even if the reproduction order is switched to a random reproduction order, or if the reproduction is switched from the random reproduction order, Even if the order of random reproduction is switched to the order of random reproduction, data can be reproduced without interruption.

According to a seventh aspect of the present invention, in the recording medium reproducing apparatus, the data is sound data for reproducing a sound.

According to the recording medium reproducing apparatus, since the data is the sound data for reproducing the sound, the sound corresponding to the deleted sound data is not reproduced. In addition, even if a reading error occurs in the data area being reproduced, since the sound data exists in the intermediate memory, the interruption of the reproduction of the sound data (sound skipping) is eliminated. Further, after the data area of the intermediate memory being reproduced is reproduced, the sound data specified in the second reproduction order can be continuously reproduced as a sound, and the sound data itself specified in the second reproduction order can be reproduced. Since the sound is reproduced after being stored in the intermediate memory, the reproduced sound is not interrupted.

[0030] In a recording medium reproducing method according to an eighth aspect, the data is compressed data.

According to this recording medium reproducing method, since the data is compressed compressed data, the deleted compressed data is not reproduced. Further, even if a reading error occurs in the data area being reproduced, the data reproduction is not interrupted because the compressed data is stored in the intermediate memory. Also, after playing the data area of the intermediate memory being played,
Subsequently, the compressed data specified in the second reproduction order can be reproduced, and the compressed data itself specified in the second reproduction order is stored in the intermediate memory and then reproduced, so that the reproduction is not interrupted. Absent. Further, since the data is compressed data, more data can be stored in the intermediate memory as compared with the non-compressed data, so that it is difficult to interrupt data reproduction due to a reading error.

In a ninth aspect of the present invention, the recording medium reproducing apparatus is a disk recording medium having a disk shape.

According to this recording medium reproducing apparatus, even if there is a data reading error temporarily due to vibration or dust attached to the disk medium when reading data from the disk recording medium, the data is stored in the intermediate memory. Therefore, there is no interruption of data reproduction. Further, after reproducing the data area of the intermediate memory being reproduced, the data specified in the second reproduction order can be reproduced continuously, and the data itself specified in the second reproduction order is also stored in the intermediate memory. The reproduction is not interrupted since the reproduction is performed after being stored in the storage device.

According to a tenth aspect of the present invention, there is provided a recording medium reproducing apparatus.
The intermediate memory is a first-in first-out memory.

According to this recording medium reproducing apparatus, even if the intermediate memory is a first-in first-out memory, the data specified by the address range of the first-in first-out memory is deleted by specifying the address range. be able to.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording medium reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a recording medium reproducing apparatus according to the embodiment, and FIGS. 2 to 5 are diagrams showing a read head position and a state of data accumulation in an intermediate memory in a stepwise manner.

First, the configuration of the recording medium reproducing apparatus according to the present embodiment will be described. Optical disk 11 as a recording medium
Is a disk recording medium such as a music compact disk (CD), a mini disk (trademark: MD), and a digital versatile disk (DVD) on which data such as music data (hereinafter referred to as sound data) is recorded. Optical disk 1
The data recorded in 1 is sound data for reproducing a sound, and is divided into a plurality of data areas, and this data area is a tune (hereinafter referred to as a track) or a movement. The pickup 12 serving as a reading unit reads sound data recorded on the optical disc 11 by, for example, irradiating a light beam and receiving reflected light from the optical disc 11.

The head amplifier 13 is an amplifier that amplifies a signal of sound data read by the pickup 12. A signal processing circuit 14 serving as a signal processing unit converts the sound data amplified by the head amplifier 13 into a digital signal,
Processing is performed so that it can be output to an intermediate memory described later. The signal processing circuit 14 reads the sound data stored in the intermediate memory, performs signal processing suitable for output, and outputs the processed signal. Alternatively, the signal processing circuit 14 controls the address range of the sound data stored in the intermediate memory under the control of the control unit described later. And so on.

The shock-proof memory 15 serving as an intermediate memory is a memory for storing sound data processed by the signal processing circuit 14, and in the present embodiment, is assumed to be a first-in first-out (FIFO) memory as an example. . When an address is designated, the shock proof memory 15 can output sound data in a data area corresponding to the address.

The microcomputer 16 as a control unit
Controls the signal processing circuit 14 and the shock-proof memory 15. For example, storing sound data in the shock proof memory 15, reproducing sound data stored in the shock proof memory 15, and deleting the sound data stored in the shock proof memory 15 by designating an address. Do. The DA converter 17 converts the sound data digitized by the signal processing circuit 14 into an analog signal, and outputs and reproduces the sound as sound.

Next, the operation of the recording medium reproducing apparatus will be described with reference to FIG. FIG. 2 shows the position of the pickup 12 at the first time point, the position at which the reproduced sound data was read at the same time, and the position of the shockproof memory 1.
5 shows an accumulation state of the sound data. The first time point is a time point when the sound data relating to the track 1 is read from the optical disk 11 and the sound data is stored in the shock proof memory 15.

In FIG. 2, an axis 20 is an axis when a plurality of tracks recorded on the optical disk 11 are linearly arranged. On the optical disk 11, track 1 is set as the first track, then track 2 and track 3 are set. And so on. However, regarding the track arrangement of the optical disc 11, each track may be arranged at intervals, one track may be further divided into a plurality of small tracks, and the order in which the tracks and the small tracks are arranged may be arranged. The tracks may be arranged in any order, and tracks and small tracks may be mixedly arranged.

A position A on the axis 20 is a reading position at which the pickup 12 reads the sound data at the first time, and a position B is the position at which the sound data corresponding to the sound reproduced at the first time is read. Represents Both positions A and B are within the area of track 1.

At this first point in time, the pickup 12
Is read out and reproduced after being temporarily stored in the shock-proof memory 15, so that when the pickup 12 continuously reads sound data from the optical disk, certain sound data is read. At the time of reproduction, the pickup 12 is already at the position A preceding the reading position B of the optical disk from which the sound data for the sound has been read, reads the sound data, and stores a predetermined amount of sound data in the shockproof memory 15. Has accumulated.

The right diagram of FIG. 2 schematically shows the state of accumulation of sound data in the shock proof memory 15 at the first point in time.
The left vertical axis relates to the boundary address indicating the boundary position of the sound data stored in the shock proof memory 15.

When the sound data read from the optical disk 11 is first input to the shock proof memory 15, the sound data is accumulated from the memory area of the address 0. The address FULL on the vertical axis is an address corresponding to the maximum amount of sound data that can be stored in the shock proof memory 15, and is a boundary address ADR1.
Is an address at the time when the sound data finally read from the track 1 at the first time point is stored, and indicates an address 8.

In the case of the present embodiment, since the shock proof memory 15 simultaneously receives and outputs sound data, the input rate of the sound data input to the shock proof memory 15 depends on the output rate output from the shock proof memory 15. Faster than shockproof memory 1
The sound data stored in No. 5 sequentially increases. Of course, control may be performed so that sound data is stored in the shock proof memory 15 after a predetermined capacity is stored and then output. Since the shock proof memory 15 is a FIFO memory, the sound data stored in the shock proof memory 15 is output according to the input order.

Here, as the reproduction order of the tracks in the present embodiment, there are a first reproduction order and a second reproduction order different from the first reproduction order. The first playback order is a playback order in which the tracks are sequentially played back in accordance with the track arrangement of the optical disk 11, such as track 1 and then track 2 and track 3 (hereinafter, normal playback). The second playback order is an order in which, for example, a playback track output from the shock proof memory 15 and played back is repeatedly played back (hereinafter, repeat). These playback orders can be switched and specified at any time. still,
From the first time point to the second time point described below, the reproduction is performed in the reproduction order of the normal reproduction.

Next, after a predetermined time has elapsed from the first time point, the pickup 12 completes reading the sound data of the track 1 and then reads the sound data of the track 2.
The state at the time is shown in FIG. The configuration in FIG. 3 is the same as that in FIG.

In FIG. 3, position A on axis 20
Is a reading position at which the pickup 12 is reading sound data at the second time point, and a position B represents a position at which sound data corresponding to the sound reproduced at the second time point is read. Position A is in the area of track 2 while position B is in the area of track 1.

The right diagram of FIG. 3 schematically shows the state of accumulation of sound data in the shock proof memory 15 at the second time point. Here, the boundary address ADR1 is an address when the last sound data of the track 1 is stored,
Address 6 is shown. Compared with the address at the first time point, since the sound data relating to track 1 has been output from the shock proof memory 15, the boundary address AD
R1 has shifted to address 6. Boundary address AD
R2 is a boundary address at the time when the sound data finally read from the track 2 is stored at the second time point. At the second time point, since the sound data is stored in the shock proof memory 15 at the maximum, the boundary address ADR2 is equal to the address FULL.

Next, FIG. 4 shows a stage (third time) when the repeat is designated as the reproduction order at the second time point and the pickup 12 moves to the head of the track 1 being reproduced. If repeat is specified as the reproduction order at the second point in time, the track 1 being reproduced is repeatedly reproduced. Therefore, the sound data of the track 2 stored in the shock proof memory 15 becomes unnecessary, and is deleted from the shock proof memory 15.

A method for deleting the sound data of the track 2 will be described. First, when the repeat is designated as the reproduction order, the microcomputer 16 sends the signal processing circuit 1
At this point, the shockproof memory 1
In step 5, a command for acquiring the final address for the last stored sound data is transmitted. Signal processing circuit 14
When this command is received, the final address at the third time point, that is, the address FULL of the sound data of the track 2 last stored in the shock proof memory 15 is obtained.

Next, the area start address of track 2, that is, the start boundary address ADR of the sound data of track 2
If the address 6 indicating the absolute position of 1 can be obtained, the address range for deleting the sound data of the track 2 can be specified. However, at each point in time track 1
Since the sound data volume of the boundary address ADR1 changes, the boundary address ADR1 also shifts, and the address indicating the absolute position of the boundary address ADR1 also changes every moment.

Therefore, in order to obtain the address indicating the absolute position of the boundary address ADR1, the elapsed time data for each track recorded on the optical disk 11 is used together with the sound data. Note that the relationship between the elapsed time data and the sound data amount for each track is as shown in the following equation (1). Elapsed time data = sound data amount × n (n is a predetermined proportional constant) (1)

At the second point in time, the signal processing circuit 14 performs the processing using the equation (1) from the elapsed time data T of the track 2 which was finally read together with the sound data by the pickup 12 from the optical disk 11, and 2 is calculated. When the sound data amount D of the track 2 is calculated, the address indicating the absolute position of the start boundary address ADR1 of the sound data of the track 2 can be obtained by the following equation (2). Address of boundary address ADR1 = address of boundary address ADR2 (address FULL) -sound data amount D of track 2 (2)

Therefore, according to equation (2), the address FUL
The address 6 which is the address of the boundary address ADR1 which is traced back from L by the sound data amount D of the track 2 can be obtained. Therefore, by specifying the address FULL to the address 6, the address range of the sound data of the track 2 can be specified. After the address range of the sound data of the track 2 is specified, only the sound data relating to the track 2 is deleted by the signal processing circuit 15.

Then, the pickup 12 moves to the head of the track 1 to read the sound data of the track 1 (position A). At the third time point, the reproduction of the track 1 is continued from the second time point (position B).
The absolute position address of the boundary address ADR1 of the shock proof memory 15 is address 4.

Next, FIG. 5 shows a state at a fourth point in time after a lapse of a short time from the third point. As shown in the right diagram of FIG. 7, after the sound data of the track 1 which is read first, the sound data of the track 1 for repeat reproduction is newly accumulated.

In the recording medium reproducing apparatus of the present embodiment,
Normal reproduction is performed as the first reproduction order. When sound data relating to a plurality of tracks (track 1 and track 2) is stored in the shock proof memory 15 (second time point), the second reproduction order is set. When repeat is specified, track 2 to be reproduced next to track 1 being reproduced
The sound data relating to (3rd time point) is deleted.

Therefore, the track being reproduced is reproduced without interruption even if a reading error occurs, and the sound data relating to the track to be read and reproduced in the normal reproduction order after the track being reproduced is not reproduced. After the track being reproduced is reproduced, the sound data specified by the repeat can be reproduced continuously, and the sound data itself specified by the repeat is stored in the shock proof memory 15 and then reproduced. Playback is not interrupted.

In the above embodiment, the case where the first reproduction order is normal reproduction and the second reproduction order is repeat has been described, but the first reproduction order is repeat reproduction of an arbitrary track. Alternatively, the second reproduction order may be normal reproduction. Further, the first playback order may be repeat playback of an arbitrary track, and the second playback order may be repeat playback of a track different from the arbitrary track.

Next, a case where the first reproduction order is normal reproduction and the second reproduction order is random reproduction of tracks (hereinafter referred to as random) will be described with reference to FIGS. . 6 and 7 are diagrams showing the read head position and the state of data accumulation in the intermediate memory in a stepwise manner. The time point in the state of FIG. 6 is the fifth time point, and the time point in the state of FIG. 7 is the sixth time point. . However, there is no temporal connection after the fourth time point and the fifth time point. Note that, even when the second playback order is random, the configuration of the recording medium playback device is the same as that of FIG. 1, and the same applies from the first time point shown in FIG. 2 to the second time point shown in FIG. Therefore, the description is omitted.

FIG. 6 shows a stage (fifth time point) in which the pickup 12 moves to the beginning of another track when the second reproduction order is randomly specified at the second time point in FIG.

When a random designation is made at the second point in time, assuming that the track to be reproduced next to the track 1 being reproduced in the shock proof memory 15 is, for example, the track 5, it is stored in the shock proof memory 15 Since the sound data of the track 2 is unnecessary, the sound data is deleted from the shock proof memory 15.

The method of deleting the sound data on track 2 is the same as that in the case of the second reproduction order, so that the description is omitted. However, only the sound data on track 2 is deleted as shown in the right diagram of FIG. Then, the pickup 12 moves to the head of the track 5 to read the sound data of the track 5 (position A). At the fifth time point, the reproduction of the track 1 is continued from the second time point (position B), and the boundary address AD of the shock proof memory 15 is read.
The absolute position address of R1 is address 4.

Next, FIG. 7 shows a state at a sixth time point after a short time has passed from the fifth time point. As shown in the right diagram of FIG. 7, the sound data of track 5 is newly stored after the sound data of track 1 which is read first.

That is, in the recording medium reproducing apparatus of this embodiment, normal reproduction is performed as the first reproduction order, and sound data relating to a plurality of tracks (track 1 and track 2) is stored in the shock proof memory 15. If the random number is designated as the second reproduction order at the time (second time point), the sound data relating to the track 2 to be reproduced next to the track 1 being reproduced is deleted (fifth time point).

Therefore, the track being reproduced is reproduced without interruption even if a reading error occurs, and the sound data relating to the track to be read and reproduced in the normal reproduction order after the track being reproduced is not reproduced. After the track being reproduced is reproduced, the sound data specified at random can be reproduced continuously, and the sound data specified at random is stored in the shock proof memory 15 and then reproduced. Playback is not interrupted.

In the above embodiment, the case where the first playback order is normal playback and the second playback order is random has been described, but the first playback order is random,
The second reproduction order may be normal reproduction. Further, the first reproduction order may be random, and the second reproduction order may be random.

Further, in the present invention, when storing sound data in the shock proof memory 15, the input rate of the sound data input to the shock proof memory 15 is higher than the output rate output from the shock proof memory 15. For example, the rotation speed of the optical disk 11 may be controlled to be high so that the sound data in the shock proof memory 15 can be stored quickly.

The data is described as sound data as an example. However, as long as the data cannot be interrupted by a read error, the data may be image data or communication data, or the data itself may be compressed. Compressed data may be used. Although the recording medium has been described as an optical disk as an example, a card-shaped or tape-shaped recording medium may be used as long as data can be stored. Further, the intermediate memory is described as an FIFO memory as an example, but may be a memory from which data can be randomly read.

[0073]

According to the recording medium reproducing method of the present invention, when the second reproduction order is designated, the data is read out from the intermediate memory and read out and reproduced according to the first reproduction order after the data area being reproduced. The data relating to the data area to be read is deleted by designating the address range, so that the data relating to the data area to be read and reproduced according to the first reproduction order after the data area being reproduced is not reproduced. Further, even if a reading error occurs in the data area being reproduced, the reproduction is not interrupted because the data is stored in the intermediate memory. Also, after playing the data area of the intermediate memory being played,
Subsequently, the data specified in the second reproduction order can be reproduced, and the data itself specified in the second reproduction order is stored in the intermediate memory and then reproduced, so that the reproduction is not interrupted.

[0074]

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording medium reproducing apparatus according to an embodiment.

FIG. 2 is a diagram illustrating a read head position and a state of data accumulation in an intermediate memory according to the embodiment (first embodiment).
Time).

FIG. 3 is a diagram showing a read head position and a state of data accumulation in an intermediate memory according to the embodiment (second embodiment).
Time)

FIG. 4 is a diagram showing a read head position and a state of data accumulation in an intermediate memory according to the embodiment (third embodiment);
Time)

FIG. 5 is a diagram showing a read head position and data accumulation in an intermediate memory according to the embodiment (fourth embodiment);
Time)

FIG. 6 is a diagram illustrating a read head position and a state of data accumulation in an intermediate memory according to the embodiment (fifth embodiment);
Time).

FIG. 7 is a diagram illustrating a read head position and a state of data accumulation in an intermediate memory according to the embodiment (sixth embodiment);
Time).

FIG. 8 is a diagram showing a state of data accumulation in an intermediate memory in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Optical disk 12 Pickup 13 Head amplifier 14 Processing circuit 15 Shockproof memory 16 Microcomputer 17 D / A converter 20 axis

Claims (10)

[Claims] 1. Recording for reading data recorded on a recording medium divided into a plurality of data areas, temporarily storing the data in an intermediate memory, and reading and reproducing the data temporarily stored in the intermediate memory. In the medium reproducing method, the data is sequentially read from the recording medium by a reading unit based on a first reproduction order specified in advance for each of the data areas, and the read data is subjected to signal processing by a signal processing unit. When a plurality of the data for each of the data areas subjected to the signal processing are stored in the intermediate memory, and the data stored in the intermediate memory is read out and reproduced based on the first reproduction order, the first
If a second playback order different from the playback order of
After the data area being read and reproduced from the intermediate memory, an address range of data relating to the data area to be read and reproduced according to the first reproduction order is specified, and the data specified by the address range is deleted from the intermediate memory. The reading unit sequentially reads the data from the recording medium based on the second reproduction order, and the read data is signal-processed by the signal processing unit and stored in an intermediate memory. And reading and reproducing the data stored in the intermediate memory in accordance with the second reproduction order after reading and reproducing the data area being reproduced from the storage medium. 2. When the second reproduction order is specified and the address range is specified, a last address of data last stored in the intermediate memory is acquired by the signal processing circuit, and the last address is stored in the intermediate memory. The elapsed time data for each data area included in the obtained data is converted into a data amount, an area start address which is traced back from the end address by the data amount is calculated, and the area from the area start address to the end address is defined as the address range. 2. The recording medium reproducing method according to claim 1, wherein the recording medium is designated. 3. Recording for reading data recorded on a recording medium divided into a plurality of data areas, temporarily storing the data in an intermediate memory, and reading and reproducing the data temporarily stored in the intermediate memory. In the medium reproducing apparatus, a reading unit that sequentially reads the data from the recording medium based on a first reproduction order specified in advance for each of the data areas, a signal processing unit that performs signal processing on the read data, An intermediate memory for accumulating a plurality of the data for each of the data areas subjected to the signal processing; and reading and reproducing the data stored in the intermediate memory based on the first reproduction order.
If a second playback order different from the playback order of
After the data area being read and reproduced from the intermediate memory, an address range of data relating to the data area read and reproduced according to the first reproduction order is designated, and the data designated by the address range is transferred from the intermediate memory. After the deletion, the reading unit sequentially reads the data from the recording medium based on the second reproduction order, and the read data is subjected to signal processing in the signal processing unit and stored in an intermediate memory, A recording medium reproducing apparatus comprising: a control unit that reads and reproduces the data area being reproduced from an intermediate memory after reading and reproducing the data stored in the intermediate memory based on the second reproduction order. 4. The control unit obtains a last address of data last stored in the intermediate memory by the signal processing circuit, and calculates an elapsed time data for each data area included in the last stored data. After converting to
4. The recording apparatus according to claim 3, further comprising: an address range designating unit that calculates an area start address that is traced back from the end address by the data amount, and specifies the area from the area start address to the end address as the address range. Media playback device. 5. The reproduction order of one of the first reproduction order and the second reproduction order is an order of repeatedly reading and reproducing an arbitrary data area. Or the recording medium reproducing device according to 4. 6. The recording according to claim 3, wherein one of the first reproduction order and the second reproduction order is an order of reading and reproducing at random. Media playback device. 7. The recording medium reproducing apparatus according to claim 3, wherein the data is sound data for reproducing a sound. 8. The recording medium reproducing apparatus according to claim 3, wherein the data is compressed data. 9. The apparatus according to claim 3, wherein the recording medium is a disk recording medium having a disk shape. 10. The intermediate memory according to claim 1, wherein:
10. The recording medium reproducing device according to claim 3, wherein the recording medium reproducing device is a first-out memory.