WO2017115463A1

WO2017115463A1 - Music server and music data processing method

Info

Publication number: WO2017115463A1
Application number: PCT/JP2016/005228
Authority: WO
Inventors: 雅巳山本; 左近　英雄; 川上　真一; 就正所; 伸悦加藤; 直裕水俣
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2015-12-28
Filing date: 2016-12-27
Publication date: 2017-07-06
Also published as: WO2017115464A1; JP2019032914A

Abstract

Provided is a music server which enables music data with high sound quality to be distributed. This music server is provided with: an optical disc drive for which operation characteristics are specified, and which reads music data from an optical disc medium in accordance with the specified operation characteristics, and generates interpolation data for music data in which uncorrectable read errors have occurred; a controller which, in cases when the interpolation data is generated, specifies, for the optical disc drive, one or more operation characteristics which are different to the specified operation characteristics, rereads the music data using each of the one or more operation characteristics, and substitutes the interpolation data with read-error-free music data or corrected music data in the reread music data; storage for storing the music data after substitution has been performed; and a communication adapter for transmitting the music data stored in the storage.

Description

Music server and music data processing method

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

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, is widely used. NAS that handles music data is also called a music server.

Some music servers include an optical disk drive, read music data from an optical disk medium with the optical disk drive, store the read music data in a storage device, 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 a technique related to data interpolation when error correction cannot be performed.

Japanese Patent Laid-Open No. 2005-100545

High-performance (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 sound quality degradation. Also, power supply noise in the music server can be a cause of sound quality degradation.

The present disclosure provides a music server and a music data processing method that enable distribution of music data with high sound quality.

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

The music data processing method according to an aspect of the present disclosure is a music data processing method in a music server including an optical disc drive, a storage, and a communication adapter. In this music data processing method, when music data is read from an optical disc medium according to predetermined operating characteristics by an optical disc drive, interpolation data is generated for music data in which a read error that cannot be corrected occurs, and interpolation data is generated, One or more operation characteristics different from the predetermined operation characteristics are designated for the optical disc drive, and the music data is read again with each of the one or more operation characteristics, and there is no reading error in the music data read again. The interpolated data is replaced with the music data or the corrected music data, the replaced music data is stored in the storage, and the music data stored in the storage is transmitted by the communication adapter.

The music server and music data processing method in the present disclosure can deliver music data with high sound quality.

FIG. 1 is a diagram schematically showing an example of the appearance of the music playback system in the first embodiment. FIG. 2 is a block diagram schematically showing an example of a functional configuration of the music playback system in the first embodiment. FIG. 3 is a flowchart showing an example of music data reading processing in the music server of the first embodiment. FIG. 4A is a diagram for explaining the music data reading process in the first embodiment. FIG. 4B is a diagram for explaining the music data reading process in the first embodiment. FIG. 4C is a diagram for explaining the music data reading process in the first embodiment. FIG. 5 is a block diagram schematically illustrating an example of a functional configuration of the music playback system according to the second embodiment. FIG. 6 is a block diagram schematically illustrating an example of a functional configuration of a storage included in the music server according to the second embodiment. FIG. 7 is a flowchart illustrating an example of storage access processing in the music server according to the second embodiment. FIG. 8 is a block diagram schematically showing an example of a functional configuration of the music playback system in the third embodiment. FIG. 9 is a diagram comparing the transfer speed and sound quality for each type of music data. FIG. 10 is a flowchart illustrating an example of music data distribution processing in the music server of the third embodiment.

The music server according to one aspect disclosed in the embodiment has an operation characteristic specified, reads music data from an optical disk medium according to the specified operation characteristic, and generates interpolation data for music data in which a read error that cannot be corrected occurs. When the drive and interpolation data are generated, one or more operation characteristics different from the specified operation characteristics are specified for the optical disc drive, and the music data is read again with each of the one or more operation characteristics. Of the re-read music data, the controller that replaces the interpolation data with music data that has no reading error or music data that has been corrected, the storage that stores the replaced music data, and the music data that is stored in the storage A communication adapter.

In the music server configured in this way, when interpolation data is generated, it is more likely that original music data that is not interpolation data is obtained by re-reading with different operating characteristics. Can be delivered.

Also, the optical disk drive may perform servo control and read music data from the optical disk medium using a phase synchronization circuit and an automatic gain control circuit. From the operation characteristics when an uncorrectable read error occurs when the interpolation data is generated, the controller (1) increases the upper limit of the response frequency of servo control, (2) increases the gain of servo control, (3 1 or more changed by at least one of the following five operations: (1) fixing the servo control gain, (4) 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.

The music server configured as described above can specify specific operation characteristics suitable for the configuration of the optical disc drive in rereading the music data when the interpolation data is generated.

Further, the controller receives an instruction indicating one or more operation characteristics and an application order of the operation characteristics, and when interpolation data is generated, the controller indicates one or more operation characteristics indicated by the instruction. In order, it may be specified for the optical disc drive.

The music server configured as described above can efficiently re-read music data in accordance with the instruction.

Also, the controller may limit the access frequency to the storage by music data.

In the music server configured as described above, the power supply noise is suppressed by restricting the access frequency to the storage, so that music data can be distributed with high sound quality.

Also, the controller may limit the communication speed of the music data communication adapter.

In the music server configured as described above, since the power supply noise is suppressed by limiting the communication speed in the communication adapter, it is possible to distribute music data with high sound quality.

The music data processing method according to one aspect disclosed in the embodiments is a music data processing method in a music server including an optical disk drive, a storage, and a communication adapter. In this method, an optical disc drive reads music data from an optical disc medium according to predetermined operating characteristics, generates interpolation data for music data in which an uncorrectable read error has occurred, and the interpolation data is generated when the interpolation data is generated. Then, one or more operation characteristics different from the predetermined operation characteristics are designated, music data is read again with each of the one or more operation characteristics, and music data with no reading error or correction among the re-read music data The interpolated data is replaced with the completed music data, the replaced music data is stored in the storage, and the music data stored in the storage is transmitted by the communication adapter.

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, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, a detailed description of already well-known matters and a redundant description of substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

Note that each of the embodiments described below shows a specific example of the present disclosure. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present disclosure. 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.

It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the substantially same component, and description may be abbreviate | omitted or simplified.

(Embodiment 1)
[1-1. Constitution]
FIG. 1 is a diagram schematically showing an example of the appearance of a music playback system 1 including a music server 100 in the first embodiment.

1, the music playback system 1 includes a music server 100, a music player 200, a mobile terminal 300, a speaker 400, a communication line 510, a communication line 521, and a communication line 522.

The music server 100 stores music data read from an optical disc medium such as CD-DA (Compact Disc Digital Audio). Then, the music server 100 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 the reproduced audio signal to the speaker 400. FIG. 1 shows a configuration in which the music player 200 includes two speakers 400 and reproduces a two-channel audio signal. However, the audio signal reproduced by the music player 200 is limited to two channels. is not. For example, a 5.1 channel audio signal may be reproduced by the music player 200. Further, 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 via the communication line 521 in accordance with an operation received from the user, and music via the communication line 522. It can be transmitted to the player 200. That is, the mobile terminal 300 also has a function as a remote controller (hereinafter abbreviated as “remote control”) for remotely operating the music server 100 and the music player 200.

The communication line 510 may be configured by, for example, a USB (Universal Serial Bus) or may be a dedicated line for distributing music data. The communication line 521 and the communication line 522 may be constituted by, for example, a wireless LAN (Local Area Network).

FIG. 2 is a block diagram schematically showing an example of a functional configuration of the music playback system 1 in the first embodiment.

The music server 100 includes an ODD (Optical Disk 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 disc medium. In addition to CD-DA, the ODD 110 may support reading of optical disc media of various standards such as DVD (Digital Versatile Disc) and BD (Blu-ray Disc (registered trademark)).

The storage 120 is a storage device that stores music data read from the optical disk medium in a nonvolatile manner (that is, the stored data is retained even after the power is turned off). The storage 120 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 establishes a communication line 510 according to one standard selected from, for example, USB 1.1, USB 2.0, USB 3.0, and USB 3.1 with the music player 200. To do. These standards have different maximum data transfer rates. Then, the USB adapter 130 transfers music data 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. Then, the LAN adapter 140 receives a command signal for controlling the music server 100 transmitted from the mobile terminal 300 via the communication line 521.

The controller 180 controls the overall operation of the music server 100. The controller 180 is composed of, for example, a one-chip microcontroller including a memory and a processor, and the SoC (System on a Chip) that performs the control function of the music server 100 when the processor executes a program stored in the memory. ).

The power source 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 to Analog Converter) and an 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 establishes a communication line 510 according to one standard selected from, for example, USB 1.1, USB 2.0, USB 3.0, and USB 3.1 with the music server 100. These standards have different maximum data transfer rates. Then, the USB adapter 230 receives music data 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 mobile terminal 300 according to, for example, the WiFi (registered trademark) standard. Then, the LAN adapter 240 receives a command signal for controlling the music player 200 transmitted from the portable terminal 300 via the communication line 522.

The DAC and AMP 250 convert the music data transferred from the music server 100 into an analog signal and amplify the analog signal. In this way, the DAC and AMP 250 reproduce the audio signal. The reproduced audio signal is output to the speaker 400, for example.

[1-2. Operation]
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 disk 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 are the upper limit of the response frequency of servo control, the gain of servo control, the mode switching whether the gain of servo control is variable or fixed, the gain of the phase synchronization circuit, and the response of the automatic gain control circuit It is expressed by a parameter that defines the speed and the like.

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 or not there is an error in the read music data, and corrects the music data if there is an error. Here, the correction means that the original music data is calculated.

If there is no error in the read music data or the music data can be corrected (that is, the original music data is obtained), the ODD 110 transmits the music data to the controller 180.

If the error is too large to correct the music data (that is, the original music data cannot be obtained), the ODD 110 uses, for example, music data at playback times before and after the playback time of the music data that cannot be corrected. Generate interpolation data. The interpolation data may be generated using a commonly used interpolation data generation method. Therefore, detailed description regarding generation of interpolation data is omitted here. Then, the ODD 110 transmits the generated interpolation data to the controller 180 together with a data interpolation notification flag indicating that data interpolation has been performed.

Such interpolation data is useful for avoiding sound interruptions when playing music data. On the other hand, as described above, such interpolation data is different from the original music data, and can cause deterioration in sound quality.

Therefore, the music server 100 performs a music data reading process 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 of the first embodiment.

In the music data reading process in the music server 100, the controller 180 first sets predetermined operating characteristics in the ODD 110 (step S11). The operating characteristic set here may be, for example, the specified value of the parameter described above.

The ODD 110 reads music data with the set operating characteristics and transmits the read result to the controller 180 (step S12). The reading in step S12 includes the above-described error detection and correction, and generation of interpolation data.

FIG. 4A is a diagram for explaining the music data reading process in the first embodiment. FIG. 4A shows an example of the reading result in step S12. 4A to 4C, the horizontal axis represents the storage position of the music data on the optical disk medium. 4A to 4C, alphabetic characters represent music data for each unit of error detection and correction and interpolation, and alphabetic characters with a symbol “′” represent interpolation data. The number represents a data interpolation notification flag, “0” represents no interpolation, and “1” represents interpolation. 4A and 4B, the interpolation data and the data interpolation notification flag related to the interpolation data are highlighted with hatching.

FIG. 4A shows an example in which music data is read with operation characteristics 0, and as a result, interpolation data g ′ is generated.

Returning to FIG. 3, the flow will be described. The controller 180 refers to the data interpolation notification flag to determine whether or not each unit of music data is interpolation data (step S13).

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

When it is determined in step S13 that the music data is interpolation data (Yes in step S13), the controller 180 sets a new operation characteristic different from the previous operation characteristic in the ODD 110 (step S14).

The ODD 110 reads the music data at the position of the interpolation data again according to the new operation characteristic set in step S14 (step 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. The operating characteristics may be changed by at least one of the following five operating characteristics. (1) Increase the upper limit of the servo control response frequency. (2) Increase servo control gain. (3) Fix the servo control gain. (4) Increase the gain of the phase synchronization circuit. (5) Decrease 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 (step S16).

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

When it is determined in step S16 that the music data is interpolation data (Yes in step S16), the controller 180 determines whether or not up to a predetermined number of operation characteristics have been tested (that is, a series of processes from step S14 to step S16). Whether or not a predetermined number of times is performed while changing the operating characteristics) (step S18). That is, this predetermined number represents the upper limit of the number of re-reading attempts by the controller 180.

If it is determined in step S18 that the predetermined number has not been reached (No in step S18), the controller 180 repeats re-reading. Therefore, the series of processing from step S14 to step S16 is performed until it is determined No in step S16, or until the number of reread attempts by the controller 180 reaches the upper limit (predetermined number) (that is, Yes in step S18). Until it is determined).

If it is determined in step S18 that a predetermined number of operation characteristics have been tried (Yes in step S18), that is, if original music data that is not interpolation data is not obtained by any of the operation characteristics, the controller 180 performs post-processing. Is executed (step S19). In the post-processing of step S19, the controller 180 may cancel the reading of the entire music including the interpolation data, or any one (for example, the first) interpolation data to prioritize the accumulation of music over the sound quality. It may be adopted. When the controller 180 adopts interpolation data, the adopted interpolation data is recorded in the storage 120 in a processing flow not shown in FIG. The content of the post-processing may be changed according to a user instruction.

FIG. 4B is a diagram for explaining the music data reading process in the first embodiment. FIG. 4B shows an example of the re-read result in step S15. 4B is represented by 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 performing rereading five times with the operation characteristics 1 to 5 and re-reading with the operation characteristics 5 as a result. . Note that five rereads are examples for explanation, and the upper limit of the number of reread attempts is not limited to five. The upper limit of the number of re-reading attempts may be more than 5 times or less than 5 times.

FIG. 4C is a diagram for explaining the music data reading process in the first embodiment. FIG. 4C shows an example of the replacement result in step S17.

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

As described above, in the music server 100 according to the first embodiment, 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, the music server 100 can store music data with less interpolation data or no interpolation data, so that music data can be distributed with high sound quality.

[1-3. Effect]
As described above, in the present embodiment, the music server is designated with operation characteristics, reads music data from the optical disk medium according to the designated operation characteristics, and generates interpolation data for music data in which an uncorrectable read error has occurred. When the interpolation data is generated with the optical disk drive, one or more operation characteristics different from the specified operation characteristics are specified 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, the controller that replaces the interpolation data with music data that has no reading error or music data that has been corrected, storage that stores the replaced music data, and music data stored in the storage A communication adapter for transmission.

Note that the music server 100 is an example of a music server. The ODD 110 is an example of an optical disk drive. The controller 180 is an example of a controller. The storage 120 is an example of storage. The USB adapter 130 is an example of a communication adapter.

For example, in the example shown in the first embodiment, the music server 100 is designated with operation characteristics, reads music data from an optical disk medium according to the designated operation characteristics, and interpolates interpolation data for music data in which an uncorrectable read error has occurred. When the ODD 110 to be generated and the interpolation data are generated, one or more operation characteristics different from the specified operation characteristics are specified for the ODD 110, and the music data is again transmitted with each of the one or more operation characteristics. Of the music data read and read again, the controller 180 that replaces the interpolation data with music data that has no reading error or music data that can be corrected, the storage 120 that stores the replaced music data, and the storage 120 A USB adapter 130 for transmitting music data.

In the music server configured as described above, 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 operation characteristics. As a result, the music server can store music data with less interpolation data or no interpolation data, and thus music data can be distributed with high sound quality.

In the music server, the optical disk drive may perform servo control and read music data from the optical disk medium using a phase synchronization circuit and an automatic gain control circuit. From the operation characteristics when an uncorrectable read error occurs when the interpolation data is generated, the controller (1) increases the upper limit of the response frequency of servo control, (2) increases the gain of servo control, (3 1 or more changed by at least one of the following five operations: (1) fixing the servo control gain, (4) 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.

For example, in the example shown in the first embodiment, in the music server 100, 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. When the interpolation data is generated, the controller 180 (1) increases the upper limit of the response frequency of servo control, (2) increases the gain of servo control, based on the operation characteristics when an uncorrectable read error occurs. 1) changed by at least one of the five operations of (3) fixing the servo control gain, (4) increasing the gain of the phase synchronization circuit, and (5) decreasing the response speed of the automatic gain control circuit. The above operating characteristics are specified for the ODD 110.

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

For example, in the example shown in the first embodiment, in the music server 100, the controller 180 receives an instruction indicating one or more motion characteristics and the application order of the motion characteristics, and when interpolation data is generated, One or more operation characteristics indicated by the instruction are designated to the ODD 110 in the order indicated by the instruction.

For example, (1) increase the upper limit of the response frequency of servo control, (2) increase the gain of servo control, (3) fix the gain of servo control, and 4) increase the gain of the phase synchronization circuit. (5) The order of decreasing the response speed of the automatic gain control circuit may be used. Alternatively, the order may be arbitrarily changed.

In this embodiment, the music data processing method is a music data processing method in a music server including an optical disk drive, a storage, and a communication adapter. In this music data processing method, when music data is read from an optical disc medium according to predetermined operating characteristics by an optical disc drive, interpolation data is generated for music data in which a read error that cannot be corrected occurs, and interpolation data is generated, One or more operating characteristics different from the specified operating characteristics are specified for the optical disc drive, and the music data is read again with each of the one or more operating characteristics, and there is no reading error in the re-read music data. The interpolated data is replaced with the music data or the corrected music data, the replaced music data is stored in the storage, and the music data stored in the storage is transmitted by the communication adapter.

In a music server that operates with this music data processing method, when interpolation data is generated, the possibility of obtaining original music data that is not interpolation data increases by re-reading with different operation characteristics. As a result, the music server can store music data with less interpolation data or no interpolation data, and thus music data can be distributed with high sound quality.

(Embodiment 2)
The music server 100A according to the second embodiment limits the frequency of access to the storage 120A using music data in order to enable distribution of music data with high sound quality.

In the following description, constituent elements that are substantially the same as those shown in the first embodiment are given the same reference numerals as those constituent elements, and descriptions thereof are omitted. In the following description, the description of the matters described in the first embodiment and the same contents as those in the first embodiment are omitted.

[2-1. Constitution]
FIG. 5 is a block diagram schematically illustrating an example of a functional configuration of the music playback system 1A according to the second embodiment.

FIG. 6 is a block diagram illustrating an example of a functional configuration of the storage 120A included in the music server 100A according to the second embodiment. In FIG. 6, the power supply 190 and the ODD 110 are not shown.

As shown in FIG. 5, the music playback system 1A includes a music server 100A, a music player 200, a portable terminal 300, a speaker 400, a communication line 510, a communication line 521, and a communication line 522. The music server 100A includes an ODD 110, a storage 120A, a USB adapter 130, a LAN adapter 140, a controller 180A, and a power source 190.

The controller 180A has a function as the controller 180 shown in the first embodiment, and additionally controls the frequency of access to the storage 120A by music data as described later.

As shown in FIG. 6, the storage 120A is, for example, an SSD. The storage 120A includes a nonvolatile memory 121, a DRAM (Dynamic Random Access Memory) 124, and a local controller 128.

The non-volatile memory 121 is a memory that can hold data without external power supply. As the nonvolatile memory 121, 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 according to the required storage capacity.

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

The local controller 128 executes data transfer (read / write to / from the non-volatile memory 121) according to a command given from the controller 180A. The local controller 128 may be composed of a one-chip microcontroller or a dedicated hardware circuit.

The storage 120A, for example, writes data transferred from the controller 180A to the nonvolatile memory 121 at a high speed such as several Gbps (Giga bits per second), and transfers data read from the nonvolatile memory 121 to the controller 180A. be able to. Here, these operations are collectively referred to as access to the storage 120A or storage access processing. Such high speed operation causes the operating current of the storage 120A to fluctuate rapidly. For this reason, such high-speed operation is considered to cause power noise that affects sound quality.

Therefore, the music server 100A according to the second embodiment performs control for limiting the frequency of access to the storage 120A using music data. Hereinafter, storage access processing including access frequency limitation will be described.

[2-2. Operation]
FIG. 7 is a flowchart illustrating an example of storage access processing in the music server 100A according to the second embodiment.

In the storage access process in the music server 100A, the controller 180A first determines whether or not the data to be accessed to the storage 120A is music data (step S21).

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

The controller 180A transfers the music data of the data amount set in step S22 to and from the storage 120A (step S23).

Controller 180A waits until the time interval set in step S22 has elapsed (step S24).

Controller 180A determines whether or not the transfer of the music data has been completed (step S25).

When the controller 180A determines that the transfer of the music data is not completed in step S25 (No in step S25), the controller 180A performs a series of processes from step S23 to step S25 until the transfer of the music data is completed (that is, Repeat until YES in step S25).

When controller 180A determines in step S21 that the data to be accessed to storage 120A is not music data (No in step S21), controller 180A may transfer the data without limiting the access frequency (step S26). ).

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

As described above, in the music server 100A according to the second embodiment, the power supply noise is suppressed by limiting the access frequency to the storage 120A, so that music data can be distributed with high sound quality.

[2-3. Effect]
As described above, in the present embodiment, the music server is designated with operation characteristics, reads music data from the optical disk medium according to the designated operation characteristics, and generates interpolation data for music data in which an uncorrectable read error has occurred. When the interpolation data is generated with the optical disk drive, one or more operation characteristics different from the specified operation characteristics are specified 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, the controller that replaces the interpolation data with music data that has no reading error or music data that has been corrected, storage that stores the replaced music data, and music data stored in the storage A communication adapter for transmission. And a controller may restrict | limit the access frequency to the storage by music data.

Note that the music server 100A is an example of a music server. The ODD 110 is an example of an optical disk drive. The controller 180A is an example of a controller. The storage 120A is an example of storage. The USB adapter 130 is an example of a communication adapter.

For example, in the example shown in the second embodiment, the music server 100A is designated with operation characteristics, reads music data from an optical disc medium according to the designated operation characteristics, and interpolates interpolation data for music data in which an uncorrectable read error has occurred. When the ODD 110 to be generated and the interpolation data are generated, one or more operation characteristics different from the specified operation characteristics are specified for the ODD 110, and the music data is again transmitted with each of the one or more operation characteristics. Of the music data read and read again, the controller 180A that replaces the interpolation data with music data that has no reading error or that has been corrected, the storage 120A that stores the replaced music data, and the storage 120A A USB adapter 130 for transmitting music data; Provided. Then, the controller 180A limits the frequency of access to the storage 120A by music data.

Furthermore, in this music server, power supply noise is suppressed by restricting the access frequency to the storage, so that music data can be distributed with higher sound quality.

(Embodiment 3)
In the music server, as described in the operation of the storage 120A in the second embodiment, when a transfer operation concentrated in time is performed in the USB adapter 130 (FIG. 2) in order to distribute music data, the operating current is steep. Therefore, it is considered that this causes power supply noise that affects sound quality.

Therefore, the music server 100B 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.

In the following description, components that are substantially the same as those shown in the first and second embodiments are assigned the same reference numerals as those of the components, and descriptions thereof are omitted. In the following description, the description of the matters described in the first and second embodiments and the same content as the first and second embodiments will be omitted.

[3-1. Constitution]
FIG. 8 is a block diagram schematically illustrating an example of a functional configuration of the music playback system 1B according to the third embodiment.

As shown in FIG. 8, the music playback system 1B includes a music server 100B, a music player 200, a portable terminal 300, a speaker 400, a communication line 510, a communication line 521, and a communication line 522. The music server 100B includes an ODD 110, a storage 120, a USB adapter 130, a LAN adapter 140, a controller 180B, and a power source 190.

The controller 180B has a function as the controller 180 shown in the first embodiment, and further performs control to limit the communication speed when distributing music data, as will be described later.

FIG. 9 is a diagram comparing the transfer speed and sound quality for each type of music data. In FIG. 9, as an example, the original sound quality of the music data for the music data in the high resolution (hereinafter referred to as “high resolution”) format, the high sound quality compression format, and the MP3 (MPEG Audio Layer 3) format. The required transfer rate and the effect of the transfer operation on the sound quality are shown in comparison.

As shown in FIG. 9, the music data of the high resolution format is relatively superior in original sound quality. However, high-resolution music data has a relatively high data rate and requires a communication line with a speed of about 1 Gbps for data transfer. For this reason, the influence of the transfer operation on distribution of music data on sound quality is relatively large.

The original sound quality of music data in the MP3 format does not reach the sound quality of the music data in the high resolution format or the music data in the high sound quality compression format. However, music data in the MP3 format has a relatively low data rate, and the data transfer may be a communication line with a speed of about 10 Mbps (Mega bits per second). For this reason, the influence of the transfer operation on the sound quality when the music data is distributed is relatively small.

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

From these comparisons, it has been found that transferring all music data, for example, at the maximum data transfer rate of the USB adapter 130 is disadvantageous for distributing music data with high sound quality.

Therefore, the music server 100B in the third embodiment performs control to limit the communication speed when distributing music data. Hereinafter, music data distribution processing including communication speed limitation will be described.

[3-2. Operation]
FIG. 10 is a flowchart illustrating an example of music data distribution processing in the music server 100B according to the third embodiment.

In the music data distribution process in the music server 100B, the controller 180B first refers to the format of the music data (step S31).

If it is determined in step S31 that the music data is in the high resolution format (high resolution in step S31), the controller 180B sets the transfer speed (communication speed) to S1 (step S32).

If it is determined in step S31 that the music data is in a high sound quality compression format (high sound quality compression in step S31), the controller 180B sets the transfer speed (communication speed) to S2 (step S33).

If it is determined in step S31 that the music data is in the MP3 format (MP3 in step S31), the controller 180B sets the transfer speed (communication speed) to S3 (step S34).

Note that the transfer speed S1, the transfer speed S2, and the transfer speed S3 set here are all lower than the maximum data transfer speed S0 of the communication adapter (for example, the USB adapter 130), and the data rate of the music data can be secured. Data transfer rate. Specifically, the transfer rate S1 is smaller than the maximum data transfer rate S0 of the communication adapter (for example, the USB adapter 130) (S1 <S0), and is a data transfer rate that can secure the data rate of the high-resolution music data. is there. The transfer rate S2 is a data transfer rate that is smaller than the transfer rate S1 (S2 <S1) and that can secure a data rate of music data with high sound quality compression. The transfer speed S3 is a data transfer speed that is smaller than the transfer speed S2 (S3 <S2) and can secure the data rate of MP3 music data.

The controller 180B distributes the music data through the USB adapter 130 at the transfer speed (communication speed) set in step S32, step S33, or step S34 (step S35). In order to limit the transfer speed in step S35, the controller 180B may limit the frequency of accessing the USB adapter 130, for example, as in the second embodiment.

Further, the controller 180B may establish the communication lines 510 having different maximum data transfer rates according to the music data format using the USB adapter 130 in order to limit the transfer rate (communication rate). When the USB adapter 130 is adapted to, for example, USB1.1, USB2.0, USB3.0, and USB3.1 standards, the controller 180B has a maximum data transfer rate of 12 Mbps, 480 Mbps, 5 Gbps, and 10 Gbps, respectively. The communication line 510 can be established using the USB adapter 130. In such a configuration, the controller 180B may establish the communication line 510 having a maximum data transfer rate of 5 Gbps (S1) in accordance with the USB 3.0 standard when distributing high-resolution format music data. Alternatively, the controller 180B may establish the communication line 510 having a maximum data transfer rate of 480 Mbps (S2) in accordance with the USB 2.0 standard when distributing music data in a high-quality sound compression format. Alternatively, the controller 180B may establish the communication line 510 having a maximum data transfer rate of 12 Mbps (S3) in accordance with the USB 1.1 standard when distributing music data in the MP3 format.

According to such music data distribution processing, it is possible to avoid 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.

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

Note that the music server 100B may incorporate the function of the music server 100A shown in the second embodiment. Specifically, in the music server 100B, the storage 120 is replaced with the storage 120A shown in the second embodiment, and the controller 180B also performs the operation of the controller 180A shown in the second embodiment. May be.

[3-3. Effect]
As described above, in the present embodiment, the music server is designated with operation characteristics, reads music data from the optical disk medium according to the designated operation characteristics, and generates interpolation data for music data in which an uncorrectable read error has occurred. When the interpolation data is generated with the optical disk drive, one or more operation characteristics different from the specified operation characteristics are specified 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, the controller that replaces the interpolation data with music data that has no reading error or music data that has been corrected, storage that stores the replaced music data, and music data stored in the storage A communication adapter for transmission. And a controller may restrict | limit the communication speed in the communication adapter of music data.

Note that the music server 100B is an example of a music server. The ODD 110 is an example of an optical disk drive. The controller 180B is an example of a controller. The storage 120 is an example of storage. The USB adapter 130 is an example of a communication adapter.

For example, in the example shown in the third embodiment, the music server 100B specifies the operation characteristics, reads the music data from the optical disk medium according to the specified operation characteristics, and interpolates the interpolated data for the music data in which the reading error that cannot be corrected occurs. When the ODD 110 to be generated and the interpolation data are generated, one or more operation characteristics different from the specified operation characteristics are specified for the ODD 110, and the music data is again transmitted with each of the one or more operation characteristics. Of the music data read and read again, the controller 180B that replaces the interpolation data with music data that has no reading error or music data that can be corrected, the storage 120 that stores the replaced music data, and the storage 120 USB adapter 130 for transmitting music data That. Then, the controller 180B limits the communication speed of the music data in the USB adapter 130.

Furthermore, in this music server, since the power supply noise is suppressed by limiting the communication speed in the communication adapter, it is possible to distribute music data with high sound quality.

In the music server, the controller may limit the access frequency to the storage by music data.

In the music server configured as described above, the power supply noise is suppressed by limiting the access frequency to the storage in addition to the limitation of the communication speed in the communication adapter, so that the music data can be distributed with high sound quality. Become.

(Other embodiments)
As described above, Embodiments 1 to 3 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these embodiments. Unless it deviates from the gist of the present disclosure, one or more of the present disclosure may be applied to various modifications conceived by those skilled in the art in the present embodiment, or forms configured by combining components in different embodiments. It may be included within the scope of the embodiments.

Therefore, other embodiments will be exemplified below.

For example, in the first embodiment, the configuration in which re-reading is performed with different operation characteristics when interpolation data is generated by the ODD 110 has been described. 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 the power supply noise is suppressed by limiting the communication speed in the USB adapter 130 has been described. Since these configurations and functions are independent of each other, a music server in which each function is incorporated independently may be configured.

As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

In addition, since the above-described embodiments are for illustrating the technique in the present disclosure, various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and the equivalents thereof.

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.

The present disclosure is applicable to a music server and a music data processing method. Specifically, the present disclosure can be applied to an audio system including a music server.

1, 1A, 1B

Music playback system

100, 100A, 100B Music server 110 ODD
120, 120A Storage 121 Non-volatile memory 124 DRAM
128 Local controller 130 USB adapter 140

LAN adapter

180, 180A, 180B Controller 190 Power supply 200 Music player 230 USB adapter 240 LAN adapter 250 ADC and AMP
280 Controller 290 Power supply 300 Portable terminal 400

Speaker

510, 521, 522 Communication line

Claims

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, and the music data is read again with each of the one or more operation characteristics and read again. A controller that replaces the interpolated data with music data having no reading error or corrected music data,
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 At least five of the following operations: (3) fixing the servo control gain, (4) increasing the gain of the phase synchronization circuit, and (5) decreasing the response speed of the automatic gain control circuit Specifying the one or more operating characteristics modified by one for 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.
The controller limits the frequency of access to the storage by the music data;
The music server according to claim 1.
The controller limits a communication speed of the music data in the communication adapter;
The music server according to claim 1.
The controller limits the frequency of access to the storage by music data;
The music server according to claim 5.
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 with no reading error or music data that 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.