JP2019032914A - Music server and processing method of music data - Google Patents

Abstract

To provide a music server for enabling distribution of music data in high sound quality.SOLUTION: A music server 100 comprises: an optical disk drive 110 to which an operation characteristic is designated, which reads music data from an optical disk medium in accordance with the designated operation characteristic, and generates interpolation data on the music data where a reading error which cannot be corrected occurs; a controller 180 which designates one or more operation characteristics different from the operation characteristic for the optical disk drive 110 when the interpolation data is generated, which reads again the music data with one or more operation characteristics and replaces the interpolation data with the music data in which the reading error does not exist or which can be corrected in music data which is read again; a storage 120 for storing the replaced music data; and a USB adapter 130 for transmitting the music data stored in the storage 120.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a music server and a music data processing method performed in the music server.

  Recently, NAS (Network Attached Storage), which is connected to an external device such as a PC (Personal Computer) or various MPs (Media Player) via a communication line, records data, and distributes the data to the external device, has become widespread. ing. NAS that handles music data is also called a music server.

  Some music servers include an optical disk drive, read and store music data from an optical disk medium with the drive, and distribute the stored music data to an external device. For example, Patent Document 1 discloses a technique related to error correction when data is read from an optical disk medium and data interpolation when error correction cannot be performed.

Japanese Patent Laid-Open No. 2005-100545

  High-end music servers are required to distribute music data with extremely high sound quality. However, the music data interpolated by error correction is generally different from the original music data recorded on the optical disk medium. Therefore, the interpolated music data can be a cause of deterioration in sound quality. Other than the interpolated music data, power noise in the music server can be considered as a cause of sound quality degradation.

  Accordingly, an object of the present disclosure is to provide a music server that enables distribution of music data with high sound quality.

  In order to solve the above-described problem, a music server according to one aspect of the disclosure is configured to interpolate music data for which an operation characteristic is specified, music data is read from an optical disc medium according to the specified operation characteristic, and an uncorrectable read error occurs. And when the interpolation data is generated, one or more operation characteristics different from the operation characteristics are designated for the optical disk drive, and the music data is again transmitted with each of the one or more operation characteristics. Of the music data read and read again, a controller that replaces the interpolation data with music data that has no reading error or that has been corrected, a storage that stores the replaced music data, and music data that is stored in the storage And a communication adapter for transmitting.

  In addition, a music server according to another aspect disclosed discloses an optical disk drive that reads music data from an optical disk medium, a storage that stores music data read by the optical disk drive, and music data that is stored in the storage A communication adapter, and a controller that limits the frequency of access to the storage by the music data.

  In addition, a music server according to another aspect disclosed discloses an optical disk drive that reads music data from an optical disk medium, a storage that stores music data read by the optical disk drive, and music data that is stored in the storage And a controller that limits the communication speed of the music data in the communication adapter.

  Note that these comprehensive or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM, and the system, method, integrated circuit, and computer program. And any combination of recording media.

  According to the music server according to the disclosed aspect, the interpolation data is replaced with the original music data by re-reading with different operation characteristics, or the power supply noise is suppressed by limiting the access frequency to the storage or the communication speed of the communication adapter. By doing so, it is possible to provide a music server that enables distribution of music data with high sound quality.

1 is an external view showing an example of a music playback system according to Embodiment 1. FIG. 1 is a block diagram illustrating an example of a functional configuration of a music playback system according to Embodiment 1. FIG. 4 is a flowchart illustrating an example of music data reading processing in the music server according to the first embodiment. 6 is a diagram for explaining music data reading processing according to Embodiment 1. FIG. 6 is a diagram for explaining music data reading processing according to Embodiment 1. FIG. 6 is a diagram for explaining music data reading processing according to Embodiment 1. FIG. 10 is a block diagram illustrating an example of a functional configuration of a storage according to Embodiment 2. FIG. 10 is a flowchart illustrating an example of storage access processing in the music server according to the second embodiment. It is a figure which compares the transfer rate and sound quality for every kind of music data which concern on Embodiment 3. FIG. 14 is a flowchart illustrating an example of music data distribution processing in the music server according to the third embodiment.

  A music server according to an aspect of the present disclosure includes an optical disc drive that is designated with operating characteristics, reads music data from an optical disc medium according to the designated operating characteristics, and generates interpolation data for music data in which an uncorrectable read error occurs; When the interpolation data is generated, one or more operation characteristics different from the operation characteristics are designated for the optical disc drive, the music data is read again with each of the one or more operation characteristics, and the read music is read again. A controller that replaces the interpolated data with music data that has no reading error or has been corrected among the data, a storage that stores the replaced music data, and a communication adapter that transmits the music data stored in the storage And comprising.

  According to such a configuration, when interpolation data is generated, there is a higher possibility that original music data that is not interpolation data is obtained by re-reading with different operating characteristics, so music data can be distributed with high sound quality. It becomes possible.

  The optical disk drive performs servo control, reads music data from the optical disk medium using a phase synchronization circuit and an automatic gain control circuit, and the controller reads the uncorrectable read error when the interpolation data is generated. (1) Increase the upper limit of the response frequency of the servo control, (2) Increase the gain of the servo control, (3) Fix the gain of the servo control, (4) The one or more operation characteristics changed by at least one of increasing the gain of the phase synchronization circuit and (5) decreasing the response speed of the automatic gain control circuit may be specified for the optical disc drive. Good.

  According to such a configuration, in the re-reading of the music data when the interpolation data is generated, it is possible to specify specific operation characteristics suitable for the configuration of the optical disc drive.

  The controller receives an instruction indicating the one or more operation characteristics and an application order of the operation characteristics, and when the interpolation data is generated, the controller displays the one or more operation characteristics indicated by the instruction. You may specify with respect to the said optical disk drive in the order shown by an instruction | indication.

  According to such a configuration, it is possible to efficiently re-read music data in accordance with the instruction.

  The controller may limit an access frequency to the storage by the music data.

  According to such a configuration, power supply noise is suppressed by limiting the frequency of access to the storage, so that music data can be distributed with high sound quality.

  The controller may limit a communication speed of the music data in the communication adapter.

  According to such a configuration, power noise is suppressed by limiting the communication speed in the communication adapter, so that music data can be distributed with high sound quality.

  A music server according to one aspect disclosed includes an optical disk drive that reads music data from an optical disk medium, a storage that stores music data read by the optical disk drive, and a communication adapter that transmits the music data stored in the storage And a controller for limiting the frequency of access to the storage by the music data.

  According to such a configuration, power supply noise is suppressed by limiting the frequency of access to the storage, so that music data can be distributed with high sound quality.

  A music server according to one aspect disclosed includes an optical disk drive that reads music data from an optical disk medium, a storage that stores music data read by the optical disk drive, and a communication adapter that transmits the music data stored in the storage And a controller for limiting a communication speed of the music data in the communication adapter.

  According to such a configuration, power noise is suppressed by limiting the communication speed in the communication adapter, so that music data can be distributed with high sound quality.

  A music data processing method according to an aspect of the disclosure is a music data processing method in a music server including an optical disk drive, a storage, and a communication adapter. The music data is processed from an optical disk medium by the optical disk drive according to predetermined operating characteristics. Interpolation data is generated for music data having read errors that cannot be corrected by reading data, and when the interpolation data is generated, one or more operation characteristics different from the operation characteristics are designated for the optical disc drive, The music data is read again with each of the one or more operation characteristics, and the interpolated data is replaced with music data that has no reading error or has been corrected among the read music data, and the music data after the replacement is replaced with the music data after the replacement. Accumulated in the storage, accumulated in the storage The music data is to transmitted in the communication adapter.

  A music data processing method according to an aspect disclosed is a music data processing method in a music server including an optical disk drive, a storage, and a communication adapter, wherein the music data is read from an optical disk medium by the optical disk drive, and the music Data is stored in a storage, music data stored in the storage is transmitted by the communication adapter, and access frequency to the storage by the music data is limited.

  A music data processing method according to an aspect disclosed is a music data processing method in a music server including an optical disk drive, a storage, and a communication adapter, wherein the music data is read from an optical disk medium by the optical disk drive, and the music Data is stored in a storage, music data stored in the storage is transmitted by the communication adapter, and a communication speed of the music data in the communication adapter is limited.

  According to such a music data processing method, the same effect as described above can be obtained.

  These general or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM. The system, method, integrated circuit, computer program Alternatively, it may be realized by any combination of recording media.

  Hereinafter, a music server according to one embodiment of the present invention will be specifically described with reference to the drawings.

  Note that each of the embodiments described below shows a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment 1)
FIG. 1 is an external view showing an example of a music playback system 1 including a music server 100 according to the first embodiment.

  As shown in FIG. 1, the music playback system 1 includes a music server 100, a music player 200, a portable terminal 300, a speaker 400, and communication lines 510, 521, and 522.

  The music server 100 stores music data read from an optical disk medium such as a CD-DA (compact disk-digital audio), and distributes the stored music data to the music player 200 via the communication line 510.

  The music player 200 reproduces an audio signal using the music data distributed from the music server 100 and outputs it to the speaker 400. The audio signal reproduced by the music player 200 is not limited to two channels and may be 5.1 channel. The music player 200 may output the reproduced audio signal to headphones (not shown). .

  The portable terminal 300 transmits a command signal for controlling the music server 100 and the music player 200 to the music server 100 and the music player 200 via the communication lines 521 and 522 according to the operation received from the user. That is, the mobile terminal 300 functions as a remote controller for the music server 100 and the music player 200.

  The communication line 510 may be constituted by, for example, a USB (Universal Serial Bus) or may be dedicated to music data distribution. The communication lines 521 and 522 may be configured by a wireless LAN (local area network), for example.

  FIG. 2 is a block diagram illustrating an example of a functional configuration of the music playback system 1.

  The music server 100 includes an ODD (optical disc drive) 110, a storage 120, a USB adapter 130, a LAN adapter 140, a controller 180, and a power source 190.

  The ODD 110 is, for example, a drive that reads music data from a CD-DA standard optical disk medium, and may support reading of various standard optical disk media such as DVD and BD in addition to the CD-DA.

  The storage 120 is a storage device that stores music data read from an optical disk medium in a nonvolatile manner, and is, for example, an SSD (solid state drive) configured with a semiconductor memory.

  The USB adapter 130 is an adapter that provides a USB communication function. The USB adapter 130 communicates with the music player 200, for example, a communication line 510 having different maximum data transfer speeds according to a standard selected from USB 1.1, 2.0, 3.0, and 3.1. And the music data is transferred to the music player 200 via the communication line 510.

  The LAN adapter 140 is an adapter that provides a wireless LAN communication function. The LAN adapter 140 establishes a communication line 521 with the mobile terminal 300 in accordance with, for example, the WiFi (registered trademark) standard, and sends a command signal for controlling the music server 100 from the mobile terminal 300 via the communication line 521. Receive.

  The controller 180 controls the overall operation of the music server 100. The controller 180 is composed of, for example, a one-chip microcomputer including a memory and a processor, and is a SoC (system on chip) that performs a control function of the music server 100 by the processor executing a program stored in the memory. There may be.

  The power supply 190 supplies power for operation to the entire music server 100.

  The music player 200 includes a USB adapter 230, a LAN adapter 240, a DAC (digital / analog converter) and AMP (amplifier) 250, a controller 280, and a power source 290.

  The USB adapter 230 is an adapter that provides a USB communication function. The USB adapter 230 communicates with the music server 100 by, for example, a communication line 510 having different maximum data transfer rates according to a standard selected from USB 1.1, 2.0, 3.0, 3.1. And the music data is transferred from the music server 100 via the communication line 510.

  The LAN adapter 240 is an adapter that provides a wireless LAN communication function. The LAN adapter 240 establishes a communication line 522 with the portable terminal 300 in accordance with, for example, the WiFi (registered trademark) standard, and receives a command signal for controlling the music player 200 from the portable terminal 300 via the communication line 522. Receive.

  The DAC and AMP 250 reproduce the audio signal by converting the music data transferred from the music server 100 into an analog signal and amplifying it. The reproduced audio signal is output to the speaker 400, for example.

  Next, music data reading by the ODD 110 will be described.

  The ODD 110 is designated with operation characteristics from the controller 180, reads music data from the optical disc medium according to the designated operation characteristics, and transmits the read music data to the controller 180. The ODD 110 may perform servo control, for example, and read music data from the optical disk medium using a phase synchronization circuit and an automatic gain control circuit. In that case, the operating characteristics include the upper limit of the response frequency of the servo control, the gain of the servo control, the mode switching whether the gain of the servo control is variable or fixed, the gain of the phase synchronization circuit, and the automatic It is represented by a parameter that defines the response speed of the gain control circuit.

  In general, music data with redundancy for error detection and error correction is recorded on the optical disk medium. Based on the redundancy, the ODD 110 determines whether there is an error in the read music data, and corrects if there is an error. Here, the correction means that the original music data is calculated.

  If the read music data has been corrected for errors (that is, the original music data has been obtained), the ODD 110 transmits the music data to the controller 180.

  When the error is too large to be corrected (that is, the original music data cannot be obtained), the ODD 110 generates interpolation data by using, for example, music data with playback times before and after, and the generated interpolation data is A data interpolation notification flag indicating that data interpolation has been performed is transmitted to the controller 180.

  Such interpolated data is useful for avoiding sound interruption when music data is reproduced, but, as described above, it is different from the original music data, and can cause deterioration in sound quality.

  Therefore, the music server 100 performs music data reading processing so as to reduce the frequency of data interpolation. Hereinafter, the music data reading process in the music server 100 will be described with reference to the flowchart of FIG. 3 and the data examples of FIGS. 4A, 4B, and 4C.

  FIG. 3 is a flowchart showing an example of music data reading processing in the music server 100.

  The controller 180 sets predetermined operating characteristics in the ODD 110 (S11). The operating characteristic set here may be, for example, the specified value of the parameter described above. The ODD 110 reads the music data with the set operation characteristics and transmits the result to the controller 180 (S12). The reading in step S12 includes the above-described error detection and correction, and generation of interpolation data.

  FIG. 4A is a diagram illustrating an example of the reading result in step S12. The horizontal axis represents the storage position of music data on the optical disk medium. An alphabetic character represents music data for each unit of error detection and correction and interpolation, and an alphabetic character with 'represents an interpolation data. The numbers represent data interpolation notification flags, where 0 indicates no interpolation and 1 indicates interpolation. Interpolation data and a data interpolation notification flag related to the interpolation data are shown highlighted in hatching.

  FIG. 4A shows an example in which interpolation data g ′ is generated as a result of reading with the operation characteristic 0.

  The controller 180 refers to the data interpolation notification flag to determine whether or not each unit of music data is interpolation data (S13).

  If it is determined that the music data is not interpolation data (No in S13), the music data is recorded in the storage 120 in the processing flow not shown.

  When it is determined that the music data is interpolation data (Yes in S13), the controller 180 sets a new operation characteristic different from the previous operation characteristic for the ODD 110 (S14), and the ODD 110 performs the new operation. The music data at the position of the interpolation data is read again according to the characteristics (S15). The reading in step S15 includes the above-described error detection and correction, and generation of interpolation data.

  Here, when the ODD 110 performs servo control and reads music data from the optical disk medium using the phase synchronization circuit and the automatic gain control circuit, the new operation characteristic set in step S14 causes a read error that cannot be corrected. (1) Increase the upper limit of the response frequency of the servo control, (2) Increase the gain of the servo control, (3) Fix the gain of the servo control, (4) The phase synchronization The operating characteristic may be changed by at least one of increasing the gain of the circuit and (5) decreasing the response speed of the automatic gain control circuit.

  The controller 180 refers to the data interpolation notification flag to determine whether or not the music data read again is interpolation data (S16).

  When it is determined that the music data is not interpolation data (No in S16), the controller 180 replaces the previously obtained interpolation data with the music data (S17). The replacement of the interpolation data by the music data may be performed on a working memory of the controller 180, for example. The music data after replacement is recorded in the storage 120 in a processing flow not shown.

  When it is determined that the music data is interpolation data (Yes in S16), the controller 180 repeats re-reading with up to a predetermined number of operation characteristics (No in S18). If the original music data that is not interpolation data is not obtained by any of the operation characteristics (No in S18), the controller 180 executes post-processing (S19). In the post-processing, reading of the entire music including interpolation data may be canceled, and any one (for example, first) interpolation data may be employed in order to prioritize the accumulation of music over sound quality. When the interpolation data is adopted, the adopted interpolation data is recorded in the storage 120 in the processing flow not shown. The content of the post-processing may be changed according to a user instruction.

  FIG. 4B is a diagram illustrating an example of a re-read result in step S15. FIG. 4B is expressed in the same notation as FIG. 4A, and the description of the data interpolation notification flag is omitted.

  FIG. 4B shows an example in which music data g corresponding to the interpolation data g ′ is obtained by re-reading with the operation characteristic 5 as a result of performing re-reading with the operation characteristics 1 to 5 five times. Note that five rereads are illustrative examples, and the upper limit of the number of reread attempts is not limited to five, but may be more or less than five.

  FIG. 4C is a diagram illustrating an example of a replacement result in step S17.

  FIG. 4C shows a final result in which the interpolation data g ′ is replaced with the music data g obtained by rereading with the operation characteristic 5. Note that the interpolation data h 'is generated by re-reading with the operation characteristic 5, but the interpolation data h' is discarded by using the previously obtained music data h. In this way, original music data is obtained for all of the music data a to j.

  According to the music server 100 described above, when interpolation data is generated, there is a high possibility that original music data that is not interpolation data is obtained by re-reading with different operation characteristics. As a result, music data with less interpolation data or no interpolation data can be accumulated, so that music data can be distributed with high sound quality.

(Embodiment 2)
The music server 100 according to the second embodiment limits the frequency of access to the storage by music data in order to enable distribution of music data with high sound quality.

  FIG. 5 is a puff lock diagram illustrating an example of a functional configuration of the storage 120 included in the music server 100.

  As illustrated in FIG. 5, the storage 120 is, for example, an SSD, and includes a nonvolatile memory 121, a DRAM (dynamic random access memory), and a local controller 128.

  The non-volatile memory 121 is a memory that can hold data without external power supply. For example, a flash memory, a ferroelectric memory, a resistance change memory, or the like can be used. One or more appropriate numbers of non-volatile memories 121 are provided depending on the required storage capacity.

  The DRAM 124 is a memory that operates faster than the nonvolatile memory 121, and is provided as a buffer for data transferred to the nonvolatile memory 121.

  The local controller 128 performs data transfer (read / write to / from the non-volatile memory 121) in accordance with a command given from the controller 180. The local controller 128 may be composed of a one-chip microcomputer or a dedicated hardware circuit.

  The storage 120 can write the data transferred from the controller 180 to the nonvolatile memory 121 and transfer the data read from the nonvolatile memory 121 to the controller 180 at a high speed of, for example, several Gbps (gigabits per second). Since the operating current of the storage 120 fluctuates abruptly due to such a high-speed operation, it is considered that it causes power supply noise that affects the sound quality.

  Therefore, the music server 100 performs control to limit the frequency of access to the storage by music data. Hereinafter, storage access processing including access frequency limitation will be described.

  FIG. 6 is a flowchart showing an example of storage access processing in the music server 100.

  When the data to be accessed to the storage 120 is music data (Yes in S21), the controller 180 sets the access frequency of the storage 120 by the music data (S22). For example, the controller 180 may set the time interval for accessing the storage 120 and the amount of data transferred for each access so that the data rate of music data can be secured.

  The controller 180 transfers the set amount of music data to and from the storage 120 (S23), and waits until the time interval elapses (S24), and repeats until the transfer of the music data is completed (S24). No in S25).

  If the data to be accessed to the storage is not music data (No in S21), the data may be transferred without limiting the access frequency (S26).

  According to such a storage access process, it is possible to avoid the time-intensive access to the storage 120 due to the music data, so that power noise caused by the operation of the storage 120 is suppressed.

  According to the music server 100 described above, power noise is suppressed by limiting the frequency of access to the storage 120, so that music data can be distributed with high sound quality.

(Embodiment 3)
As in the case of the storage 120 described in the second embodiment, when a transfer operation concentrated in time is performed in the USB adapter 130 (FIG. 2) to distribute music data, a steep fluctuation of the operating current occurs, resulting in sound quality. It is thought to cause power supply noise to such an extent that it affects.

  Therefore, the music server 100 according to the third embodiment limits the communication speed when distributing music data in order to enable distribution of music data with high sound quality.

  FIG. 7 is a diagram for comparing the transfer speed and sound quality for each type of music data. As an example, for music data in high resolution, high sound quality compression, and MP3 formats, the original sound quality of music data and the necessary transfer The effects of speed and transfer operation on sound quality are compared.

  As shown in FIG. 7, the music data in the high resolution format is excellent in the original sound quality of the music data, but has a high data rate and requires a communication line having a speed of about 1 Gbps for transfer. For this reason, the influence on the sound quality of the transfer operation when distributing music data is great.

  On the other hand, the music data of the MP3 format has the original sound quality of the music data, but the data rate is low, and a communication line with a speed of about 10 Mbps (megabits per second) is sufficient for transfer. Therefore, the influence on the sound quality of the transfer operation when distributing music data is small.

  The music data in the high sound quality compression format has an intermediate characteristic between the music data in the high resolution format and the music data in the MP3 format.

  From such a comparison, it is clear that transferring all music data at the maximum speed of the USB adapter 130, for example, is disadvantageous for distributing music data with high sound quality.

  Therefore, the music server 100 controls to limit the communication speed when distributing music data. Hereinafter, music data distribution processing including communication speed limitation will be described.

  FIG. 8 is a flowchart showing an example of music data distribution processing in the music server 100.

  The controller 180 refers to the music data format (S31). If the music data is in high resolution format (high resolution in S31), the transfer speed is set to S1 (S32), and if the music data is in high sound quality compression format (high sound quality compression in S31), the transfer speed is set to S2 (S33). ), If the music data is in MP3 format (MP3 in S31), the transfer speed is set to S3 (S34). The transfer speeds S1, S2, and S3 set here are all smaller than the maximum speed S0 of the USB adapter 130 and are large enough to secure the data rate of music data.

  The controller 180 distributes the music data at the set transfer speed via the USB adapter 130 (S35). In order to limit the transfer speed in step S35, the controller 180 may limit the frequency of accessing the USB adapter 130, for example, as in the first embodiment.

  Further, the controller 180 may establish a communication line 510 having a maximum speed that differs depending on the format of the music data using the USB adapter 130 in order to limit the transfer speed. For example, when the USB adapter 130 conforms to the USB 1.1, 2.0, 3.0, and 3.1 standards, a communication line 510 having a maximum speed of 12 Mbps, 480 Mbps, 5 Gbps, and 10 Gbps, respectively, is established. be able to. In this case, in order to deliver high-resolution, high-quality compression, and MP3 music data, the maximum speeds are 12 Mbps (S1), 480 Mbps (S2), and 12 Mbps, respectively, according to the USB 3.0, 2.0, and 1.1 standards. The communication line 510 in (S3) may be established.

  According to such music data distribution processing, it is possible to avoid the time-intensive access to the USB adapter 130 due to the music data, so that power noise caused by the operation of the USB adapter 130 is suppressed.

  According to the music server 100 described above, power noise is suppressed by limiting the communication speed in the USB adapter 130, so that music data can be distributed with high sound quality.

(Other variations)
The music server according to the embodiments of the present invention has been described above, but the present invention is not limited to these embodiments. Unless it deviates from the gist of the present invention, one or more of the present invention may be applied to various modifications that can be conceived by those skilled in the art, or forms constructed by combining components in different embodiments. It may be included within the scope of the embodiments.

  For example, in the first embodiment, a configuration has been described in which re-reading with different operation characteristics is performed when interpolation data is generated by the ODD 110. In the second embodiment, the configuration in which power supply noise is suppressed by limiting the access frequency to the storage 120 has been described. In the third embodiment, the configuration in which power supply noise is suppressed by limiting the communication speed in the USB adapter 130 has been described. Since these configurations are independent of each other, the present invention may be configured independently.

  The present invention can be widely used in audio systems as a music server.

1 music playback system 100 music server 110 ODD (optical disc drive)
120 Storage 121 Non-volatile memory 124 DRAM
128 Local controller 130 USB adapter 140 LAN adapter 180 Controller (SoC)
190 Power supply 200 Music player 230 USB adapter 240 LAN adapter 250 ADC and AMP
280 controller (SoC)
290 Power supply 300 Mobile terminal 400 Speaker 510, 521, 522 Communication line

Claims (10)

An optical disk drive that is designated with operating characteristics, reads music data from the optical disk medium according to the specified operating characteristics, and generates interpolation data for music data in which an uncorrectable read error has occurred;
When the interpolation data is generated, one or more operation characteristics different from the operation characteristics are designated for the optical disc drive, the music data is read again with each of the one or more operation characteristics, and the read music is read again. A controller that replaces the interpolated data with music data that has no reading error or has been corrected among the data; and
A storage for storing the music data after the replacement;
A communication adapter for transmitting music data stored in the storage;
A music server comprising: The optical disk drive performs servo control, reads music data from an optical disk medium using a phase synchronization circuit and an automatic gain control circuit,
When the interpolation data is generated, the controller increases (1) the upper limit of the response frequency of the servo control from the operating characteristics when the uncorrectable read error occurs, (2) the gain of the servo control Change by at least one of (3) fixing the servo control gain, (4) increasing the gain of the phase-locked loop, and (5) decreasing the response speed of the automatic gain control circuit. Designating the one or more operating characteristics to the optical disc drive;
The music server according to claim 1. The controller receives an instruction indicating the one or more operation characteristics and an application order of the operation characteristics, and when the interpolation data is generated, the controller determines the one or more operation characteristics indicated by the instruction by the instruction. Specify for the optical disc drive in the order shown,
The music server according to claim 1 or 2. The controller limits the frequency of access to the storage by the music data;
The music server according to any one of claims 1 to 3. The controller limits a communication speed of the music data in the communication adapter;
The music server according to any one of claims 1 to 4. An optical disc drive for reading music data from an optical disc medium;
A storage for storing music data read by the optical disc drive;
A communication adapter for transmitting music data stored in the storage;
A controller for limiting the frequency of access to the storage by the music data;
A music server comprising: An optical disc drive for reading music data from an optical disc medium;
A storage for storing music data read by the optical disc drive;
A communication adapter for transmitting music data stored in the storage;
A controller for limiting a communication speed of the music data in the communication adapter;
A music server comprising: A music data processing method in a music server comprising an optical disk drive, a storage, and a communication adapter,
With the optical disc drive, music data is read from an optical disc medium according to predetermined operating characteristics,
Generate interpolated data for music data that has an uncorrectable reading error,
When the interpolation data is generated, specify one or more operation characteristics different from the operation characteristics for the optical disc drive,
Re-reading the music data with each of the one or more operating characteristics;
Of the music data read again, the interpolation data is replaced with music data that has no reading error or has been corrected,
Store the replaced music data in the storage,
The music data stored in the storage is transmitted by the communication adapter.
Music data processing method. A music data processing method in a music server comprising an optical disk drive, a storage, and a communication adapter,
Reading music data from an optical disc medium with the optical disc drive,
Storing the music data in storage;
Send the music data stored in the storage with the communication adapter,
Limiting the frequency of access to the storage by the music data;
Music data processing method. A music data processing method in a music server comprising an optical disk drive, a storage, and a communication adapter,
Reading music data from an optical disc medium with the optical disc drive,
Storing the music data in storage;
Send the music data stored in the storage with the communication adapter,
Limiting the communication speed of the music data in the communication adapter;
Music data processing method.

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