JP4301069B2 - Playback device - Google Patents

Description

  The present invention relates to a playback apparatus, and more particularly to a playback apparatus suitable for an apparatus that repeatedly plays an audio signal by designating a section from a disk-shaped recording medium.

  At present, a small-diameter optical disk having a diameter of about 64 mm and having a storage capacity that enables recording of, for example, a musical sound signal for 74 minutes or more has come to be widely known. This small-diameter optical disk is called a mini-disc MD (registered trademark), a read-only type in which data is recorded by pits, and a recording / reproduction in which data is recorded by a magneto-optical recording (MO) method and can be reproduced. There are two types of molds. The following description relates to a recording / reproducing small-diameter optical disk (hereinafter referred to as a magneto-optical disk). In order to increase the recording capacity of the magneto-optical disk, the track pitch, the recording wavelength of the recording laser light, the NA of the objective lens, and the like have been improved.

  As shown in FIG. 14, an initial magneto-optical disk in which groove recording is performed at a track pitch of 1.6 μm and the modulation method is EFM is referred to as a first generation MD. The physical format of the first generation MD is defined as follows. The track pitch is 1.6 μm and the bit length is 0.59 μm / bit. The laser wavelength λ is λ = 780 nm, and the aperture ratio of the optical head is NA = 0.45. As a recording system, a groove recording system that uses grooves (grooves on the disk board surface) as tracks for recording and reproduction is adopted. The address system employs a system using a wobbled groove in which a single spiral groove is formed on the disk surface and wobbles as address information are formed on both sides of the groove. In this specification, the absolute address recorded by wobbling is also referred to as ADIP (Address in Pregroove). This first generation MD employs an EFM (8-14 conversion) modulation system as a recording data modulation system. As an error correction method, ACIRC (Advanced Cross Interleave Reed-Solomon Code) is used. In addition, a convolution type is adopted for data interleaving. As a result, the data redundancy is 46.3%. The data detection method in the first generation MD is a bit-by-bit method, and CLV (Constant Linear Verocity) is adopted as the disk drive method. The linear velocity of CLV is 1.2 m / s. The standard data rate at the time of recording / reproducing is 133 kB / s, and the recording capacity is 164 MB (140 MB in MD-DATA). The minimum data rewrite unit (cluster) is composed of 36 sectors including 32 main sectors and 4 link sectors.

  Furthermore, in recent years, high-density MDs with higher recording capacity than the first generation MDs have been developed. First, a conventional medium (disk or cartridge) is left as it is, and the modulation method, logical structure, and the like are changed to double the user area and the like, and the recording capacity is increased to, for example, 300 MB (hereinafter referred to as high density MD1). Was developed. The physical specifications of the recording medium are the same, the track pitch is 1.6 μm, the laser wavelength λ is λ = 780 nm, and the aperture ratio of the optical head is NA = 0.45. As a recording method, a groove recording method is adopted. The address system uses ADIP. Thus, the configuration of the optical system, the ADIP address reading method, and the servo processing in the disk drive device are the same as those in the first generation MD. This high-density MD1 uses an RLL (1-7) PP modulation method (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) suitable for high-density recording as a modulation method of recording data. Adopted. Further, as an error correction method, an RS-LDC (Reed Solomon-Long Distance Code) method with BIS (Burst Indicator Subcode) having higher correction capability is used.

  Furthermore, as the high-density MD, the high-density MD3 having a larger recording capacity than the high-density MD1 has a track pitch narrowed to 1.25 μm while maintaining the compatibility of the outer shape and the optical system, and moves the domain wall from the groove, for example. It was developed by a method of detecting a recording mark by detection (Domain Wall Displacement Detection: DWDD). This high-density MD3 uses an RLL (1-7) PP modulation method (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) suitable for high-density recording as a modulation method for recording data. Adopted. Further, as an error correction method, an RS-LDC (Reed Solomon-Long Distance Code) method with BIS (Burst Indicator Subcode) having higher correction capability is used. Data interleaving is a block-complete type. As a result, the data redundancy becomes 20.50%. As a data detection method, a Viterbi decoding method based on PR (1, -1) ML is used. A cluster which is the minimum data rewrite unit is composed of 16 sectors and 64 kB. A ZCAV system is used as the disk drive system, and the linear velocity is 2.0 m / s. The standard data rate at the time of recording / reproducing is 9.8 MB / s. Therefore, in the high-density MD3, the total recording capacity can be reduced to 1 GB by adopting the DWDD method and this driving method.

  By the way, in the reproducing apparatus for reproducing the first generation MD, the high density MD1, and the high density MD3, in order to repeatedly reproduce a predetermined section, (1) a start point and an end point are determined as one song ( Divide editing is used to make one song), and (2) only the song created in (1) above is repeatedly played (one song repeat playback). However, this method cannot be used for songs that cannot be edited (such as pre-mastered discs), and it is necessary to read from the disc many times for short songs (sections). There was a drawback that the sound would be interrupted if it could not keep up with the sound.

  Japanese Patent Laid-Open No. 2000-293924 discloses that when a playback section is designated by address A and address B, after the audio data up to address B has been stored in the memory, playback output up to address B is being performed. When the audio data to be reproduced and output next to the address B is stored in the memory 18 in advance, the memory returns to the address A on the MD and is read by the optical pickup. A configuration for storing the audio data in the memory 18 is described.

JP 2000-293924

  By the way, when normal reproduction is performed as in the above-mentioned patent document 1, the data that has been reproduced is discarded as unnecessary. Therefore, it is conceivable to reuse the data once accumulated in the buffer many times. In order to reuse the buffer many times, it must not be discarded. However, if the playback section is larger than the capacity of the buffer, it is necessary to overwrite the next data after discarding it in the same way as normal playback.

  Since the playback section is set by the user, it cannot be determined that the end position of the playback section is determined if the amount of data fits within the buffer. In this way, it is necessary to determine whether to reuse the data accumulated in the buffer many times, or to discard the data and overwrite the next data when the playback section is larger than the buffer capacity.

  The present invention has been made in view of the above situation, and the data accumulated in the buffer is reused many times, or when the playback section is larger than the capacity of the buffer, the data is discarded and the next It is an object of the present invention to provide a playback device that makes it easy to determine whether to overwrite data.

In addition, the present invention, since there is no need to split editing of the track even if you hear the repetition of short sentences in such as language learning, even if there is no recording function to the disk, the provision of repetition designation reproduction is possible and reproducing apparatus Objective.

  Also, when reusing the data stored in the buffer many times, the access & storage is repeated only "until it is stored in the buffer once". It is an object of the present invention to provide a playback apparatus that does not generate “

Furthermore, no I rows repeated access to the provision of power to merit is born reproducing apparatus by mechanical driving is eliminated since the Buffer in reproduction.

In order to solve the above problems, the reproducing apparatus according to the present invention includes a reading unit that reads recording data recorded on a disk-shaped recording medium, a storage unit that stores recording data read by the reading unit, When a section specified by the start point and end point of repeated playback is specified in one track composed of the recorded data, the time length of the specified repeated playback section is equal to the predetermined storage capacity of the storage means. Storage control means for executing repetitive reproduction processing in the storage means in which repetitive reproduction processing is performed only with the recording data once accumulated in the storage means when the time is shorter than the time length , the storage control means, When executing the repetitive reproduction process in the storage means, the flag indicating that the repetitive reproduction process in the storage means is performed is turned on, and then Recording data is stored in the storage means, and the playback point in the storage means when the repeated playback start point, the repeated playback end point, the flag, and the repeated playback processing in the storage means are stopped before the power is turned off. Is stored in the non-volatile memory, the playback is stopped during the repetitive playback process in the storage means, and when the power is turned on after the power is turned off, the start point of the repeated playback stored in the non-volatile memory and the end of the repeated playback are stored. Based on the point, the flag, and the reproduction counter in the storage means when the repetitive reproduction processing in the storage means is stopped, the reproduction is started again from the position where it was stopped and the storage means in the designated repeated reproduction section is started. Ru return to repeat the reproduction processing.

  In this playback apparatus, when a section specified by a start point and an end point of repeated playback is specified in one track made of recorded data, the time length of the specified repeated playback section is stored in a predetermined storage unit. When the time length is shorter than the capacity, the repetitive reproduction process in the storage means using the recording data once stored in the storage means is executed.

The playback apparatus according to the present invention stores the time length of the designated repeated playback section when the section specified by the start and end points of repeated playback is designated in one track made of recorded data. When the time length is shorter than the predetermined storage capacity, the replay processing in the storage means using the recording data once stored in the storage means is executed, so that the data stored in the buffer is reused many times. Or, when the playback section is larger than the buffer capacity, it is easy to determine whether to discard the data and overwrite the next data. Also, even when listening to repeated short sentences in language learning or the like, it is not necessary to divide and edit tracks, so that it is possible to repeatedly specify and reproduce without a disc recording function. Also, when reusing the data stored in the buffer many times, the access and storage is repeated only "until it is stored in the buffer once". Is not generated. Furthermore, no I rows repeated access, power to merit is born by the mechanical driving is eliminated since the Buffer in reproduction.

  Hereinafter, the best mode for carrying out the present invention will be described. FIG. 1 is a diagram showing a schematic configuration of a magneto-optical disk reproducing apparatus 1 according to the embodiment. The magneto-optical disk reproducing apparatus 1 reproduces a high-density disk 2 such as a high-density MD1 or a high-density MD3. Of course, you may apply to the apparatus which reproduce | regenerates 1st generation MD.

  The magneto-optical disk reproducing device 1 has a disk reading unit 3 for reading recording data recorded on the high-density MD 2 and a predetermined storage capacity, and the recording data read by the disk reading unit 3 is stored. It comprises a DRAM 12 that is a ring buffer memory, a memory controller 15 that controls the DRAM 12, and an audio decoder 13 that decodes data reproduced from the DRAM 12.

  When a section specified by a start point and an end point of repeated playback is specified in one track made of recorded data, the memory controller 15 determines the time length of the specified repeated playback section and a predetermined storage capacity of the DRAM 12. The time length of the minute is compared, and based on the comparison result, it is determined whether to set the mode in which the reproduction is repeated in the DRAM (buffer) 12 or to perform the reproduction by repeated repetition as usual. For example, when the time length of the designated repeated playback section is shorter than the time length corresponding to the predetermined storage capacity of the DRAM 12, the repeated playback processing in the DRAM using the recording data once accumulated in the DRAM 12 is executed. The repeated reproduction process in the DRAM will be described later.

  In the present invention, it is assumed that the section reproduction is performed within one song, that is, within one track.

  FIG. 2 is a diagram showing a detailed configuration of the magneto-optical disk reproducing apparatus 1. The disk reading unit 3 includes a spindle motor 4 for rotating the high-density MD2, an optical pickup 5 for reading data recorded on the high-density MD2, and an RF signal and an ADIP signal from the data read by the optical pickup 5. And an RF amplifier 6 for generating a tracking error signal, a focus error signal, and the like. Further, the reproduction signal processing unit 9 which performs reproduction signal processing on the RF signal from the RF amplifier 6 and supplies it to the DRAM 12, the address decoder 10 which decodes the address from the ADIP, and the tracking servo signal based on each error signal. A servo circuit 7 that generates a servo signal such as a focus servo signal and supplies the servo signal to the motor driver 8, and a drive controller 11.

  As a reproduction processing system, demodulation corresponding to RLL (1-7) PP modulation during reproduction of high-density MD2 (RLL (1-7) demodulation based on data detection using PR (1, -1) ML and Viterbi decoding) ) And a part for performing RS-LDC decoding.

  Information (photocurrent obtained by detecting the laser reflected light with a photodetector) detected by the laser irradiation on the high-density MD 2 of the optical pickup 5 as the reflected light is supplied to the RF amplifier 6. The RF amplifier 6 performs current-voltage conversion, amplification, matrix calculation, and the like on the input detection information, and performs reproduction RF signal, tracking error signal TE, focus error signal FE, groove information (high density MD2) as reproduction information. (ADIP information recorded by track wobbling).

  At the time of reproduction of the next-generation MD2, the reproduction RF signal obtained by the RF amplifier 6 is transmitted through the A / D conversion circuit, equalizer, PLL circuit, and PRML circuit in the reproduction signal processing unit 9 to RLL (1-7) PP. Signal processing is performed by the demodulator and the RS-LDC decoder. The reproduction RF signal is obtained by the RLL (1-7) PP demodulating unit to obtain reproduction data as an RLL (1-7) code string by data detection using PR (1, -1) ML and Viterbi decoding. RLL (1-7) demodulation processing is performed on the RLL (1-7) code string. Further, error correction and deinterleaving are performed by the RS-LDC decoder. The demodulated data is output to the DRAM 12 as reproduced data (compressed data) from the high-density MD2.

  The tracking error signal TE and the focus error signal FE output from the RF amplifier 6 are supplied to the servo circuit 7, and the groove information is supplied to the address decoder 10.

  The address decoder 10 extracts a wobble component by band-limiting the groove information with a bandpass filter, and then performs FM demodulation and biphase demodulation to extract an ADIP address. The extracted ADIP address, which is absolute address information on the disk, is supplied to the drive controller 11 as a high-density MD2 address.

  The drive controller 11 executes predetermined control processing based on the ADIP address. The groove information is returned to the servo circuit 7 for spindle servo control.

  The servo circuit 7 generates a spindle error signal for ZCAV servo control, for example, based on an error signal obtained by integrating a phase error with a reproduction clock (PLL clock at the time of decoding) with respect to groove information.

  Further, the servo circuit 7 responds to a spindle error signal, a tracking error signal supplied from the RF amplifier 6 as described above, a focus error signal, a track jump command from the system controller 16 via the drive controller 11, an access command, or the like. Based on this, various servo control signals (tracking control signal, focus control signal, thread control signal, spindle control signal, etc.) are generated and output to the motor driver 8. That is, various servo control signals are generated by performing necessary processing such as phase compensation processing, gain processing, and target value setting processing on the servo error signal and command.

  The motor driver 8 generates a predetermined servo drive signal based on the servo control signal supplied from the servo circuit 7. The servo drive signal here includes a biaxial drive signal for driving the biaxial mechanism (two types of focus direction and tracking direction), a sled motor drive signal for driving the sled mechanism, and a spindle motor drive signal for driving the spindle motor 4. It becomes. With such a servo drive signal, focus control, tracking control, and ZCAV control for the spindle motor 4 are performed for the high-density MD2.

The DRAM 12 holds the compressed data supplied from the disk reading unit 3 and buffers it. Then, the buffered compressed data is output to the audio decoder 13 under the control of the memory controller 15 that performs memory control according to a command from the system controller 16 .

  The audio decoder 13 generates digital audio data by performing a decompression process on the compressed data input from the DRAM 12. The digital audio data generated in this way is converted into an analog audio signal from the output terminal 14 via an A / D converter (not shown), and reproduced and output as an audio output.

  As described above, the magneto-optical disk reproducing apparatus 1 is configured to buffer the data read from the high-density MD 2 in the DRAM 12 and then reproduce and output the data.

An operation unit 17 is connected to the system controller 16 . As shown in FIG. 3, the operation unit 17 includes a play key 21, a pause key 22, a stop key 23, a fast forward FF key 24, and a fast reverse FR key 25 on the operation panel. In addition, an operation key 26 for repeating a section AB specified by a start point A and an end point B of repeated reproduction within one track made of recorded data, a status indicator 27 for the start point A, and an end A state indicator lamp 28 for the point B is provided. Further, the operation panel of the operation unit 17 is provided with a liquid crystal display unit 29, which displays a battery remaining amount display 30 and a display regarding AB repeat.

In these configurations, the memory controller 15 is designated according to a command from the system controller 16 when a section specified by a start point and an end point of repeated playback is specified in one track made of recorded data. When the time length of the designated repeated reproduction section is shorter than the time length corresponding to the predetermined storage capacity of the DRAM 12, the repeated reproduction processing in the DRAM using the recording data once accumulated in the DRAM 12 is executed. In addition, when executing the repeated reproduction process in the DRAM, the memory controller 15 accumulates the recording data in the one track up to the front so as not to overwrite the accumulation start position in the DRAM 12. Further, the memory controller 15 accumulates the recording data at the start point of the repeated reproduction from the accumulation end position in the DRAM 12 where the recording data at the end point of the repeated reproduction is accumulated to a position before the accumulation start position.

  FIG. 4 is a flowchart showing a processing procedure of the system controller 16 corresponding to a user operation using the operation unit 17. For example, when the AB repeat key 26 shown in FIG. 3 is pressed once, the section playback mode is selected (step S1), and the start point A is determined (step S2), whether or not playback is currently being performed. Is checked in step S3. If not currently being reproduced, reproduction is started in step S4, and the process proceeds to step S5. If it is currently being played, the process proceeds directly to step S5.

  In step S5, it is checked whether or not there is a track break. If it is a track break, the end point is determined in step S7 even if the end point determination operation is not performed by the user. If it is not a track break, it is checked in step S6 whether or not an end point determination operation has been performed by the user. If the end point determination operation is performed in step S6, the process proceeds to step S7 to determine the end point. If the end point determination operation is not performed in step S6, the process returns to step S5. When the end point is determined in step S7, the section reproduction process is started in step S8.

  FIG. 5 is a flowchart showing a processing procedure of the system controller 16 when the compressed data read by the disk reading unit 3 is stored in the DRAM 12. When the section reproduction mode is selected in step S11 and the start point is determined in step S12, the address on the disc of the start point A is held in the address holding register in step S13. When the end point B is determined in step S14, the address on the disk of the end point B is held in the address holding register in step S15.

Next, the system controller 16 causes the memory controller 15 to check whether or not the section reproduction can be realized in the DRAM 12. Memory controller 15 in accordance with commands from the system controller 1 6, when the section specified specified by the start point of the repeated reproduction within one track consisting of recording data and the end point, of the designated repeated reproduction section By comparing the time length with the time length corresponding to the predetermined storage capacity of the DRAM 12, it is checked whether or not the section reproduction can be realized in the DRAM 12 (step S16).

  In step S16, the time length of the section specified by the start point and the end point of repeated reproduction in one track made of the recording data is larger than the time length corresponding to the predetermined storage capacity of the DRAM (buffer) 12. If it is determined that the period is shorter, the section playback in the buffer can be realized, and the section playback flag in the buffer is turned on in step S17. Thereafter, in step S18, the start-end section is repeatedly stored in the buffer. If it is determined in step S16 that the time length of the section specified by the start point and the end point of repeated playback is longer than the time length corresponding to the predetermined storage capacity of the DRAM (buffer) 12, the process directly goes to step S18. Then, the start-end section is repeatedly accumulated in the buffer.

  In step S19, it is checked whether or not the in-buffer section playback flag is on. If it is determined that the above-mentioned playback flag is on, the in-buffer section playback processing is performed. After stopping, the accumulation process is terminated. If it is determined in step S19 that the in-buffer section reproduction flag is off, the accumulation process is terminated as it is.

  FIG. 6 is a flowchart showing a processing procedure of the system controller 16 for causing the memory controller 15 to reproduce the compressed data from the DRAM 12. When the reproduction process is started from the start point A of the DRAM 12 in step S21, the reproduction is continued in step S22, and it is checked whether or not the section end point B is reached in step S23. If it is determined in step S23 that it is the section end point B, it is checked in step S24 whether or not the in-buffer section reproduction flag is on. If it is determined that the in-buffer section playback flag is on, playback is paused in step S25, and then the process proceeds to step S26 where the playback counter is set to the start point A in the buffer, and playback is resumed in step S27.

  FIG. 7 is a diagram showing a specific example of the intra-buffer section reproduction process. In step S2 of FIG. 4, the AB repeat key 26 of the operation unit 17 is operated, and the start point A is determined. Thereafter, steps S3 to S6 are processed, and the AB repeat key 26 is operated in step S7 to determine the end point B. However, it is determined that there is no track break at the branch of step S5, and it is determined that the track is cut at step S5 in addition to the case where B is determined by performing the end point determination operation at step S6. In such a case, there is a case where a track break is set as the end point B even if the AB repeat key 26 is not operated.

In step S16 in FIG. 5, the system controller 16 checks whether or not the section reproduction can be realized in the buffer. Specifically, first determine the time length T _A-B of the playback section P _A to P _B the address P _A on the disk of the start point A of the track 1 from the address P _B of the end point B. Of course, the compression ratio of data and discrete recording of data are taken into consideration. Next, the time length T _{buffer corresponding} to the predetermined storage capacity of the buffer area of the DRAM 12 is also determined in consideration of the data compression rate. Then, the time length T _{A-B of} the playback sections P _{A to} P _B is compared with the time length T _{buffer corresponding} to the predetermined storage capacity of the buffer area. If the time length T _{A-B of the} playback sections P _{A to} P _B is shorter than the time length T _{buffer corresponding} to the predetermined storage capacity of the buffer area, the section playback in the buffer is possible. The process proceeds to step S17.

  In the state shown in FIG. 7, the state display lamp 27 at the start point A and the state display lamp 28 at the end point B provided on the operation unit 17 are turned off, blinking, and turned on. When the section reproduction mode is entered, the status indicator lamp 27 blinks and the status indicator lamp 28 is extinguished until point A is determined. When the point A is determined, the status indicator lamp 27 is turned on, and the status indicator lamp 28 flashes to prompt the user to wait for the determination of the point B. When the point B is determined, the status indicator lamp 28 is also turned on.

8 and 9 are diagrams showing a specific example of determining whether or not the in-buffer section reproduction process is possible (step S16 in FIG. 5). When the playback section A-B is determined, the system controller 16 sends a buffer control signal (Buffer_ctl) to the memory controller 15 to determine whether to repeat in the DRAM or not to repeat in the DRAM. This determination is made by calculating the number of blocks consumed (number of sectors) in the section AB from the addresses of the points A and B immediately before the start of AB repeat accumulation. When the consumption block is equal to or greater than the threshold value (in_dram_thd) corresponding to the predetermined storage capacity of the DRAM, the normal AB repeat operation is performed without performing reproduction within the DRAM. If consumption block, is less than the threshold value (in_dram_thd), in order intends row playing the DRAM, and holds the information in the DRAM. More specifically, when the number of blocks calculated in the case of high-density MD is smaller than two-thirds of the total capacity of the DRAM, it is possible to repeat in the DRAM.

  Hereinafter, the processing of the system controller 16 when performing reproduction in the DRAM will be described with reference to FIGS. When performing reproduction in the DRAM, the system controller 16 sends a buffer control signal (Buffer_ctl) to the memory controller 15, and accumulates the AB section with some space left in the DRAM. This is because the data at the point A stored at the top of the DRAM is not overwritten. In addition, accumulation starts after the flag is set. This is for distinguishing between repeated playback in the DRAM and normal playback in return from sleep. In the case of the in-DRAM playback mode, the system controller 16 temporarily stops monitoring the remaining amount of DRAM.

  For reproduction, the system controller 16 repeats reproduction of the data in the AB section stored at the head of the DRAM. When the reproduction is performed up to the point B, the reproduction is temporarily stopped, the counter is returned to the first point A, and the reproduction is started.

FIG. 10 is a diagram showing a specific example of normal section reproduction processing, that is, reproduction processing by repeated convolution. This is a case where the time length T _A-B of the playback sections P _{A to} P _B is longer than the time length T _buffer of the buffer 12.

  FIG. 11 is a diagram for explaining repeated accumulation. As usual, the system controller 16 controls the memory controller 15 and continuously accumulates the AB section until the DRAM is full. Further, the system controller 16 controls the memory controller 15 to continuously reproduce the data stored in the DRAM as usual. Further, the system controller 16 monitors the remaining amount of DRAM as usual, and performs re-storing when the remaining amount decreases.

  FIG. 12 is a diagram for explaining the operation when the FF key 24 is operated on the operation unit 17 while the buffer section playback process is being performed. It jumps to the end point B of the repeated playback, starts playback from there, and waits for the determination of the start point of the next repeated playback.

  Further, in the present embodiment, playback is stopped during section playback, and the section playback state can be maintained even if the power is cut off. The section start point, end point, and in-buffer playback mode information (flag), the playback counter in the buffer when playback is stopped are stored in the nonvolatile memory, and the state is restored after the power is turned on. FIGS. 13A, 13B, and 13C show states when returning from sleep after power-off. Before sleep, the in-buffer section playback is performed as shown in (a). At this time, both the nv.in_dram_flg and ram.in_dram_flag flags are on. In addition, the resume point is saved. Immediately after returning from sleep, normal reproduction is repeated as shown in FIG. Although accumulation is performed from the resume point, when it is determined that the play mode is different at the B point, the reproduction is stopped. Thereafter, re-storing is performed from point A. Then, after re-storing is completed, as shown in (c), the AB section is repeatedly reproduced.

  Note that the process of pausing playback at step S25 in FIG. 6 and setting the playback counter at the start point in the buffer at step S26 may be triggered by the following state change. The memory controller 15 accumulates the recording data at the starting point A of the repeated reproduction from the accumulation end position in the DRAM 12 where the recording data at the end point of the repeated reproduction is accumulated, to just before the accumulation start position.

  As a result, the system controller 16 determines whether the repeated playback end point B stored at the accumulation end position in the DRAM 12 and the recorded data from the repeated playback start point A stored before the accumulation start position are stored. By detecting the switching, reproduction is performed from the start point of repeated reproduction by jumping to the accumulation start position in the DRAM 12.

  Further, when the end point B is reached, the data after B may be stored in the DRAM 12 as it is. In this case, when the repetitive playback section is released, even if a mechanical delay occurs such as turning the disk, operating the servo, and moving the optical pickup, a time margin can be gained.

1 is a diagram showing a schematic configuration of a magneto-optical disk reproducing apparatus 1 according to an embodiment. It is a figure which shows the detailed structure of a magneto-optical disk reproducing | regenerating apparatus. It is a figure which shows the operation part of a magneto-optical disc reproducing | regenerating apparatus. It is a flowchart which shows the process sequence of the system controller corresponding to a user's operation using an operation part. It is a flowchart which shows the process sequence of a system controller when storing the compressed data read in the disk reading part in DRAM. It is a flowchart which shows the process sequence of the system controller which reproduces compressed data from DRAM to a memory controller. It is a figure which shows the specific example of the area reproduction process in a buffer. It is a figure which shows the state of a buffer when the section reproduction process in a buffer is performed. It is a figure which shows the state of a buffer when the section reproduction process in a buffer is performed. It is a figure which shows the specific example of a normal area reproduction process. It is a figure for demonstrating repeated accumulation. It is a figure for demonstrating operation | movement when a FF key is operated when the area reproduction process in a buffer is performed. It is a figure which shows a state when it returns from sleep after power-off. It is a figure which shows the disk specification of 1st generation MD, high density MD1, and high density MD3.

Explanation of symbols

1 magneto-optical disk playback device, 2 magneto-optical disk, 3 disk reading unit, 12 DRAM, 15 memory controller

Claims (7)

A reading means for reading the recorded data recorded on the disk-shaped recording medium;
Storage means for storing recording data read by the reading means;
When a section specified by the start point and end point of repeated playback is specified in one track composed of the recording data, the time length of the specified repeated playback section and a predetermined storage capacity of the storage means A storage control means for performing a repeated reproduction process in the storage means for comparing the time length and performing the repeated reproduction process only with the recording data once stored in the storage means based on the comparison result ,
The storage control means, when executing the repetitive reproduction process in the storage means, turns on a flag indicating that the repetitive reproduction process in the storage means is turned on and then stores the recording data in the storage means, and before turning off the power. Storing the start point of the repeated playback, the end point of the repeated playback, the flag, and the playback counter in the storage unit when the repeated playback process in the storage unit is stopped in a nonvolatile memory,
When the playback is stopped during the repeated playback process in the storage means and the power is turned on after the power is turned off, the repeated playback start point, the repeated playback end point, the flag, and the storage means stored in the nonvolatile memory are stored. based on the reproduction counter in the memory when stopping the repeated reproduction process, playback device returns from the stop position in the storage means in repetitive reproduction process at the specified repetition reproduction section to start playback. Said storage control means, said when performing storage means repeated reproduction process, the reproduction apparatus 請 Motomeko 1, wherein you pause the storage means monitoring the remaining monitor. Said storage control means, when executing said storage means repeated reproduction process, the reproduction of 請 Motomeko 1, wherein stopping the entrapment recording data in the one track at up before the entrapment start position in said storage means apparatus. Said storage control means, the repeat in the storage means the recording data of end point is Tamekoma playback entrapment reservoir from the end position to the front of the entrapment start position recording data of the start point of the repeated reproduction write No請 The playback device according to claim 3 . By detecting the switching between the repetitive playback end point stored at the storage end position in the storage means and the recording data from the repetitive playback start point stored before the storage start position. a reproducing apparatus flying the repeating reproduction line cormorants請 Motomeko 4, wherein the reproduction from starting point to entrapment start position in the storage means. When a fast forward operation is performed during the repeated playback process in the storage means, the playback jumps to the end point of the repeated playback, starts playback from the end point of the repeated playback, and waits for determination of the start point of the next repeated playback. One請 Motomeko 1 reproducing apparatus according. When the time length of the designated repeated reproduction section is longer than the time length corresponding to the predetermined storage capacity of the storage means, the storage control means reads the recording data read by the reading means every time reproduction is repeated. reproducing apparatus repeatedly 請 Motomeko 1 wherein that perform reproduction processing using the record data Tamekoma the while entrapment in the storage means.

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