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KR20100094915A - Semiconductor memory based mobile storage medium for providing highquality uncompressed audio, and audio playing system using the storage medium - Google Patents

Semiconductor memory based mobile storage medium for providing highquality uncompressed audio, and audio playing system using the storage medium Download PDF

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Publication number
KR20100094915A
KR20100094915A KR1020090017783A KR20090017783A KR20100094915A KR 20100094915 A KR20100094915 A KR 20100094915A KR 1020090017783 A KR1020090017783 A KR 1020090017783A KR 20090017783 A KR20090017783 A KR 20090017783A KR 20100094915 A KR20100094915 A KR 20100094915A
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South Korea
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storage medium
audio
portable storage
data
file
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KR1020090017783A
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Korean (ko)
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임창수
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임창수
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/061—Improving I/O performance
    • G06F3/0611—Improving I/O performance in relation to response time
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0638—Organizing or formatting or addressing of data
    • G06F3/0643—Management of files
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
    • G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE: A semiconductor memory based mobile storage medium for providing high-quality uncompressed audio and an audio playback system using the storage medium are provided to store high-quality uncompressed music data in a portable external semiconductor storage medium. CONSTITUTION: A semiconductor memory based mobile storage medium comprises a contact part(11) and a data storage area(12). The contact part is connected to an external device to allow data communication between the external device and the internal data storage area. The data storage area has a data storage space which is allocated with memory address and includes a file system structure and one or more audio data. The file system structure is recorded in a specified area and comprises a volume structure for defining a physical medium as a usable space and a file structure for hierarchically defining the arrangement of files and directory. The location of specific data is found through the volume structure and the file structure.

Description

Semiconductor memory-based portable storage media for providing high quality uncompressed audio and audio playback system using the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable storage medium based on a semiconductor memory for providing high quality uncompressed audio and an audio reproduction system using the same. In particular, a file such as a UDF (universal disk format) used in an optical storage medium in a portable external semiconductor storage medium can be used. The present invention relates to a technology for recognizing and playing back high quality uncompressed audio data contained in a portable flash memory by applying a system and providing a high quality uncompressed PCM audio data having a file structure of a DVD-VIDEO format.

Recently, MP3 compression has been widely used as a method of providing music files. This is because the MP3 music file has a small size and excellent sound quality. However, since MP3 music files are formats in which some frequency bands constituting the sound source are deleted and compressed, sound quality is inevitably deteriorated compared to conventional CD sound sources.

Conventional optical storage media such as CDs have been widely used for providing high-quality, uncompressed audio data. However, in recent years, portability and capacity have been limited, leading to a decrease in popularity. In addition, uncompressed audio data takes up more capacity than MP3 compressed data, so it only takes a few songs on a single CD medium, making it easier to store and use tens or hundreds of MP3 audio data in a portable MP3 player. There is no choice but to be greatly ignored by users.

The medium in which MP3 files are stored generally takes the form of a semiconductor memory such as a USB memory or a flash memory and employs a FAT file system. The FAT file system is a file system optimized for storing a large amount of hierarchical data and does not represent a structure of a file system designed for sound source reproduction. In addition, when the uncompressed high-quality music file is stored in the semiconductor memory, memory management is not easy because the capacity is very large compared to the MP3 file.

An object of the present invention is to provide an external semiconductor storage medium capable of storing high-quality uncompressed music data and an audio reproducing system for recognizing and processing such storage medium as if playing DVD.

It is also an object of the present invention to provide a technology for reproducing a high quality external sound source in a device such as a notebook computer having only a memory slot without a drive capable of recognizing an optical medium.

In accordance with another aspect of the present invention, there is provided a semiconductor memory-based portable storage medium for providing high quality uncompressed audio, comprising: a contact portion connected to an external device to move data between an external device and an internal data storage area, and a memory address assigned to each data storage space. A semiconductor memory-based portable storage medium including a data storage area. A data storage area includes a volume structure that is recorded in a specific area and defines a physical medium as usable space, and a directory and file arrangement hierarchically. A file system structure including a defining file structure, wherein a location information of specific data is identified through a volume structure and a file structure; And one or more audio data arranged in accordance with the file system structure.

In addition, the file system structure of the semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention preferably has a configuration in accordance with the universal disk format (UDF).

In addition, in the semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention, the file structure according to the file system has a form of UDF DVD-VIDEO format including one or more of an audio TS directory and a video TS directory. It is preferable that one or more song data is composed of a file structure and recorded in stereo uncompressed PCM audio of any one of 24-bit 96 'and 24-bit 48' in one or more areas of the audio TS directory and the video TS directory.

In addition, the semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention preferably includes at least one of a music title, album information, a jacket image, and artist information as a feature in the data storage area. .

In addition, the portable storage medium based on semiconductor memory for providing high-quality uncompressed audio according to the present invention is MMC card, CF card, XD card, smart media card, SD card, mini SD card, micro SD card, SM card, memory stick It is preferable that one of the implemented one has an appearance and physical properties.

In addition, in a semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention, audio data in an uncompressed PCM form is recorded as audio data, and a file system structure indicates a position of a track and audio data representing the audio data. It is preferable to include track position information to which the information is associated.

An audio reproduction system using a semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention includes a contact portion and a data storage space in which data is moved between an external device and an internal data storage area by being connected to an external device. A semiconductor memory-based portable storage medium comprising a data storage area allocated with a memory address, wherein the data storage area is a hierarchy of volume structures, directories and files that are recorded in a specific area and define physical media as available space. A portable storage medium including a file structure defining a file structure and including a file system structure in which location information of specific data is identified through a volume structure and a file structure, and one or more audio data arranged according to the file system structure; And an audio reproducing application having a memory slot into which a portable storage medium can be mounted and recognizing and processing a storage medium mounted in the memory slot according to a file system of a universal disc format (UDF). Reads a portable storage medium to check the file system and file structure, and when a portable storage medium is recognized as a file system in the universal disk format (UDF) and a file structure in the UDF DVD-VIDEO format, a specific area of the portable storage medium. And an audio reproducing apparatus for automatically executing data of the apparatus.

According to the present invention, high-quality uncompressed music data of 24-bit 48 kHz or 96 kHz can be provided in a portable external semiconductor storage medium, thereby providing an excellent sound quality than MP3 or CD.

In addition, by recognizing the portable flash memory in the DVD-VIDEO format, any type of DVD device can play the sound source contained in the storage medium of the present invention.

In addition, since there is no need for an audio decoder, royalty-related problems do not occur, and simple software modifications can be played on various portable digital devices including mobile phones.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 (A) is an overall configuration diagram of a semiconductor memory-based portable storage medium for providing high-quality uncompressed audio according to the present invention.

The portable storage medium 10 includes a semiconductor memory-based storage medium that can be inserted into an external device such as a computer, a notebook, a mobile phone, a music player, and the like. Accordingly, a contact portion 11 connected to an external device to move data with an internal data storage area is provided, and a data storage area 12 having a memory address assigned to each data storage space is provided in the portable storage medium 10. do.

The portable storage medium 10 does not have its own controller as in a USB memory. Therefore, it is solely responsible for the control process of reading the portable storage medium 10 from the external device.

However, unlike RAM, which is a volatile memory, a file system for efficiently managing the stored data is recorded in the portable storage medium 10.

In this case, instead of using a FAT file system used in a flash memory or a floppy disk, a file system used in an optical storage medium such as a DVD is used for the data storage area 12 of the portable storage medium 10. A typical example is the universal disk format (UDF) file system.

At this time, it is preferable to employ a UDF file system and have a file structure of a DVD-VIDEO format. This is to enable the portable storage medium 10 in the form of a flash memory to be played using a general DVD player or a DVD playback program of a PC. The file structure of the DVD-VIDEO format will be described in more detail later with reference to FIG. 3.

The file system of the optical storage medium is configured in such a manner that both a data-only medium and a readable medium can be managed. The file system has a volume structure and a file structure to manage data hierarchically.

The file system structure recorded in the data storage area 12 of the portable storage medium 10 is recorded in a specific area of the data storage area 12 and includes a volume structure that defines a physical medium as usable space, and a directory and file. It consists of a file structure that defines the layout hierarchically.

Then, the external device can determine the location information of the specific data through the volume structure and the file structure of the file system recorded on the portable storage medium 10.

Finally, the data storage area 12 of the portable storage medium 10 records one or more high quality audio data arranged according to this file system structure. In this case, stereo PCM audio data having a 24-bit resolution in an uncompressed manner may be stored as the audio data.

That is, if the data storage area 12 of the portable storage medium 10 according to the present invention has a capacity of 1 Gbyte based on the same playback time as a standard audio CD having 650 M bytes, a sample rate of 24 bits of 48 ㎑ is required. Uncompressed digital audio data can be stored and stereo uncompressed PCM audio data having a sample rate of up to 24-bit 96kHz for 2G byte capacity and 24-bit 192kHz for 4G byte capacity.

Therefore, according to the present invention, by applying a file system used in an optical storage medium such as UDF instead of a FAT file system and using a DVD-VIDEO file structure, it is possible to record high-quality uncompressed PCM audio data intact. Data accessibility from external devices can be further improved.

FIG. 1B is a block diagram of an audio reproduction system using the portable storage medium of FIG. 1A according to the present invention.

The portable storage medium 10 described above may be mounted and used in the memory slot 21 of the external device 20 such as a computer, a notebook, a mobile phone, a music player, and the like.

That is, the external device 20 includes a memory slot 21 for mounting a portable storage medium, and recognizes a storage medium mounted in the memory slot 21 according to a file system of a universal disk format (UDF). And an audio reproduction application for processing.

In this case, as an audio playback application of the external device 20, a general DVD player or a multimedia DVD playback software installed in a PC may be used as it is.

That is, the portable storage medium 10 has a file structure of a UDF file system and a UDF DVD-VIDEO format described later with reference to FIG. 3 as described above. The portable storage medium 10 can be recognized as a DVD video medium and played back.

In addition, the external device 20 may be set to automatically execute the portable storage medium 10 by providing an automatic execution option.

The specific operation process for this is as follows. When the portable storage medium 10 is inserted into the memory slot of the external device 20 having an audio playback function such as a DVD player, the external device 20 reads the portable storage medium 10 to check the file system and the file structure. do. When the portable storage medium is recognized as a file system of a universal disk format (UDF) and a file structure of a UDF DVD-VIDEO format, data of a specific area of the portable storage medium 10 is automatically executed.

In other words, the user can insert the portable storage medium 10 into the memory slot 21, and the sound source stored in the portable storage medium is automatically played. This is similar to the case where the DVD is automatically played when the DVD is inserted into the DVD player. Has the same effect.

1 (C) is a diagram showing the appearance of various flash memories used as the portable storage medium of FIG. 1 (A).

The portable storage medium 10 may include an MMC card (multi-media card), a compact flash (CF) card, an extreme digital (XD) card, a smart media (SM), a secure digital (SD) card, a mini SD card, and a micro SD card. , Various types of flash memory such as a memory stick may be used.

In addition to the above-mentioned flash memory, all the semiconductor-based memory cards can be applied to the present invention.

2 is a diagram showing the arrangement of data according to the universal disk format (UDF) constituting a file system of a portable storage medium according to the present invention.

A volume recognition sequence (VRS) represents information representing one or more volume structures and corresponds to information that is first accessed in a process of recognizing a UDF file system.

The VDS (volume descriptor sequence) contains information indicating the volume structure of the storage medium, such as information about the contents of the volume constituting the storage medium and information about partitions for partitioning the volume. In addition, the location information of the FSD for accessing the file structure of the storage medium can be calculated through the information stored in the VDS.

The AVDP (anchor volume descriptor pointor) contains the position information of the VDS described above and is recorded at a specific position called an anchor point in the data storage area. The anchor point points to logical sector 256 and the last logical sector in the data storage area. Thus, if only one of the two anchor points is read, the AVDP can be read.

A file set descriptor (FSD) contains information about files and directories on the volume. In other words, the hierarchical directory can be searched through the information stored in the FSD to access a file to be played on an external device.

In addition, uncompressed PCM-type audio data and other data containing sound source information are stored in the remaining area of the data storage area.

In this case, the track position information may be further included in the UDF file system in order to recognize the song corresponding to the audio data as the track information in the external playback apparatus. That is, the track position information includes information in which the track representing the audio data and the position information of the audio data correspond to each other, and may be achieved through a virtual allocation table (VAT) provided by a specific version of the UDF. Accordingly, the external playback apparatus can find the actual position of the track corresponding to each song through the track position information in the data storage area and read the corresponding audio data.

In addition, the UDF bridge format may be used for the case where the external device has a limitation in recognizing the DVD medium. The portable storage medium in this case has a multiple structure of a file system according to ISO 9660 standard and a UDF file system suitable for DVD.

3 is a diagram showing the structure of files and directories of a storage medium having a file structure of a UDF DVD-VIDEO format.

In order to record high-quality uncompressed PCM audio data on a portable storage medium according to the present invention so that it can be played through a general music player, it is preferable to use the UDF DVD-VIDEO format. In this case, a high quality sound source can be played through a general DVD player or a DVD playback application.

The file structure according to the DVD-VIDEO format generally has a structure in which an audio TS directory and a video TS directory are formed in a root directory. Also, IFO, BUP, and VOB files are arranged in the video TS directory. In this case, the BUP file means a backup file for the IFO file, and the IFO file contains information on chapters, sub tracks, and audio tracks. The VOB file contains the actual video, audio subtitles, and menu contents.

However, in the present invention, since the main purpose is to play music data, it is not meaningful to actually have a video TS directory. However, in order to recognize the portable storage medium according to the present invention as a DVD-VIDEO medium in a general DVD player device, it is desirable to maintain such a basic file structure. In particular, it is desirable to maintain this minimal configuration since player devices that play DVD-VIDEO media are generally implemented to first recognize VIDEO_TS.IFO files located in the video TS directory.

In some cases, if a technical standard corresponds between the playback device and the storage medium, it is possible not to include any one directory. In other words, the file structure of the portable storage medium has a file structure in the form of a DVD-VIDEO format including one or more of an audio TS directory and a video TS directory.

Stereo uncompressed PCM audio data is stored in at least one of the audio TS directory and the video TS directory. At this time, it is preferable that the audio data is recorded with one or more pieces of song data in 24-bit 48 kHz or 96 kHz stereo uncompressed PCM audio. This provides a much higher sound quality than the 16-bit 44.1 오디오 audio provided by conventional CD media.

In addition, in filling a high-quality audio data into a portable storage medium in the form of a flash memory according to the present invention, the above-mentioned file structure is in the form of a DVD-VIDEO format, but the present invention mainly provides audio data. DVD-VIDEO bandwidth is filled with high quality audio data.

That is, the video video data may be set to have no or no use at all, and by using the remaining storage space as the audio data storage space, a larger amount of high-quality audio data may be filled.

In addition, the data storage area of the portable storage medium may store music titles, album information, jacket images, artist information, etc. in addition to high-quality audio data as features provided in the DVD-VIDEO format.

4 is a flowchart illustrating a process of recognizing a storage medium of a UDF DVD-VIDEO format by a DVD player.

First, the ECMA 167 descriptor is found and recognized from the VRS region corresponding to the position of the logical sector 16 in the portable storage medium (S10).

Next, the AVDP located at the anchor point is found to obtain position information of the VDS (S20). The anchor point is located in logical sector 256 and the last logical sector. Therefore, you only need to find one of the two locations, and usually only logical sector 256.

Next, the VDS is read by referring to the position information of the VDS identified above, and the partition information constituting the volume and the position information of the FSD for accessing the file structure are obtained therefrom (S30).

By reading the FSD, the position information of the FE (file entry) indicating the ROOT directory is obtained (S40).

The location information of the ROOT directory is obtained by reading the FE representing the ROOT directory (S50).

Next, you can get information about the subdirectories of the ROOT directory by accessing the ROOT directory and parsing the contents of the ROOT directory. That is, the FID indicating the VIDEO_TS directory which is a subdirectory is found from the parsing result (S60). In the FID representing the VIDEO_TS directory, location information of the FE representing the VIDEO_TS directory is stored.

The FE representing the VIDEO_TS directory is read to obtain location information of the VIDEO_TS directory (S70).

Next, by accessing the VIDEO_TS directory and parsing the contents of the VIDEO_TS directory, information on subdirectories or files included in the VIDEO_TS directory can be obtained. That is, in this case, the FID indicating the VIDEO_TS.IFO file to be checked first is found (S80). The FID representing the VIDEO_TS.IFO file stores the location information of the FE representing the VIDEO_TS.IFO file.

The FE representing the VIDEO_TS.IFO file is read to obtain location information and other information of the VIDEO_TS.IFO file (S90).

Through this process, the DVD player first recognizes the VIDEO_TS.IFO file located in the VIDEO_TS directory from the storage medium of the UDF DVD-VIDEO format. In addition, other files are read through the above process (S100).

FIG. 5 is a diagram illustrating in detail a file structure and a process of reading a VIDEO_TS.IFO file according to the UDF DVD-VIDEO format.

In the UDF file system, the file structure is a hierarchical structure of file entries (FEs) representing directories and files, starting from the root directory, and each FE is a file identifier that provides location information for subdirectories or files. It can be accessed through a descriptor.

In this case, according to the general UDF file system structure, the location of the data is not directly recorded in the FID, but instead, the location of the information control block (ICB) is recorded to access the data through the ICB. In other words, data such as data length, position, and attribute are recorded in the ICB.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 (A) is an overall configuration diagram of a portable storage medium based on a semiconductor memory for providing high-quality uncompressed audio according to the present invention;

1 (B) is a block diagram of an audio reproduction system using the portable storage medium of [1 (A)] according to the present invention;

1 (C) is a view showing the appearance of various flash memories used as the portable storage medium of FIG. 1 (A),

2 is a diagram showing the arrangement of data according to a universal disk format (UDF) constituting a file system of a portable storage medium according to the present invention;

3 is a diagram showing the structure of files and directories of a storage medium having a file structure of a UDF DVD-VIDEO format;

4 is a flowchart illustrating a process in which a DVD player recognizes a storage medium of a UDF DVD-VIDEO format.

FIG. 5 is a diagram illustrating in detail a file structure and a process of reading a VIDEO_TS.IFO file according to the UDF DVD-VIDEO format.

Claims (7)

A semiconductor memory based portable storage medium comprising a contact portion connected to an external device to move data between the external device and an internal data storage area, and a data storage area in which a memory address is allocated to each data storage space. In the data storage area, A volume structure recorded in a specific area and defining a physical medium as usable space, and a file structure hierarchically defining the arrangement of directories and files, and location information of specific data through the volume structure and the file structure. File system structure to be identified; And One or more audio data arranged in accordance with the file system structure; A portable storage medium based on semiconductor memory for providing high quality uncompressed audio, including recorded. The method according to claim 1, The file system structure is a semiconductor memory-based portable storage medium for providing high-quality uncompressed audio, characterized in that the configuration according to the universal disk format (UDF). The method according to claim 2, The file structure according to the file system comprises a file structure in the form of a UDF DVD-VIDEO format including one or more of an audio TS directory and a video TS directory. Providing high quality uncompressed audio, wherein at least one piece of song data is recorded in at least one of the audio TS directory and the video TS directory as one of 24-bit 96 kHz and 24-bit 48 kHz. A portable storage medium based on semiconductor memory. The method according to claim 3, The portable storage medium includes at least one of a music title, album information, a jacket image, and artist information in the data storage area as a feature, wherein the portable storage medium is a semiconductor memory-based portable storage medium for providing high quality uncompressed audio. . The method according to claim 4, The portable storage medium is implemented to have the appearance and physical characteristics of one of the MMC card, CF card, XD card, smart media card, SD card, mini SD card, micro SD card, SM card, memory stick A portable storage medium based on semiconductor memory for providing high quality uncompressed audio. The method according to claim 3, As the audio data, audio data in the form of uncompressed PCM is recorded. The file system structure may include track position information in which tracks representing the audio data and position information of the audio data are associated with each other. The semiconductor memory-based portable storage medium for providing high-quality uncompressed audio. The portable storage medium of claim 3; And And an audio reproducing application including a memory slot for mounting the portable storage medium and recognizing and processing a storage medium mounted in the memory slot according to a file system of a universal disk format (UDF). When a portable storage medium is inserted, the portable storage medium is read to check a file system and a file structure. When the portable storage medium is recognized as a file system in a universal disk format (UDF) and a file structure in a UDF DVD-VIDEO format, the portable storage medium is read. An audio reproducing apparatus for automatically executing data of a specific area of a portable storage medium; Audio playback system using a semiconductor memory-based portable storage medium for providing a high quality uncompressed audio comprising a.
KR1020090017783A 2009-02-19 2009-03-02 Semiconductor memory based mobile storage medium for providing highquality uncompressed audio, and audio playing system using the storage medium KR20100094915A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018105961A3 (en) * 2016-12-05 2018-08-02 주식회사 아동브이알에프 High-quality audio player for android operating system-based portable electronic device and method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018105961A3 (en) * 2016-12-05 2018-08-02 주식회사 아동브이알에프 High-quality audio player for android operating system-based portable electronic device and method therefor

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