KR100725355B1 - Apparatus and method for file searching - Google Patents

Abstract

The present invention relates to a file retrieval device and method, and more particularly, to a file retrieval device and method for retrieving a music file having a similar rhythm by comparing an operation rhythm extracted from an inertial signal generated by an inertial sensor with a rhythm of a previously stored music file. will be.

According to an embodiment of the present invention, a file retrieval apparatus includes an inertial sensor for detecting a motion, a rhythm extractor for extracting a motion rhythm from an inertial signal generated according to the detected motion, and a rhythm similar to the motion rhythm among previously stored files. And a file search unit for searching for a music file having an output unit for outputting the searched music file.

Inertial sensors, music files, rhythm, motion rhythm

Description

Apparatus and method for file searching}

1 is a conceptual diagram illustrating a file searching process according to an exemplary embodiment of the present invention.

2 is a block diagram illustrating a file searching apparatus according to an exemplary embodiment of the present invention.

3 is a conceptual diagram illustrating a first error calculation process according to an embodiment of the present invention.

4 is a conceptual diagram illustrating a second error calculation process according to an embodiment of the present invention.

5 is a flowchart illustrating a file searching process according to an exemplary embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

210: inertial sensor 220: rhythm extraction unit

230: storage unit 240: file search unit

250: first rhythm analyzer 260: second rhythm analyzer

270 output section

The present invention relates to a file retrieval device and method, and more particularly, to a file retrieval device for retrieving a music file having a similar rhythm by comparing an operation rhythm extracted from an inertial signal generated by an inertial sensor with a rhythm of a prestored music file. And to a method.

Innovative developments in digital audio signal processing technology have resulted in the emergence of MP3 players, which represent portable digital audio players. These MP3 players can use the flash memory for compressed data storage to play and output audio for a long time without tape.

The portable MP3 player is very compact in size and does not require a cassette tape or a compact disc, and also allows the user to selectively download desired music files to a flash memory and repeatedly play them without degrading sound quality. There is this.

The MP3 player uses flash memory, a compact disk, or a mini disk as a storage means for storing MP3 files. The MP3 player mainly uses flash memory for reasons of miniaturization and stability of the MP3 player. In addition, MP3 that supports CF Card (Compact Flash Card), SD Card (Secure Digital Card), SM Card (Smart Media Card), MMC Card (Multimedia Card) or Memory Stick to expand storage capacity Players also appeared, and hard disk-type MP3 players with high storage capacity appeared.

Here, the capacity of the storage means is generally about 128MB ~ 1GB flash memory, 5GB ~ 100GB hard disk is used, the sample rate is 44.1 kHz and the bit rate is used to create a typical MP3 file In the case of 128 kbps, one MP3 file of about 4 minutes is about 4 MB in size. Thus, about 30 to 25,000 MP3 files can be stored in one MP3 player. That is, as the storage capacity increases, more MP3 files can be stored. Accordingly, music selection by the user becomes more difficult.

Most recently released MP3 players have a display unit such as an LCD (Liquid Crystal Display). The display unit also provides information on the currently playing song and allows a user to select stored music. Also provided. The user can select the music he / she wants by searching the list of music files displayed on the display. At this time, the user can use a button or the like provided in the MP3 player. In other words, the user browses through the list of music files with his eyes and selects the music file he wants.

Meanwhile, an MP3 player without a display unit has also appeared, which plays music files only in the order in which they are stored or randomly selected music files. Therefore, the user may feel difficulty in selecting music, and it is very difficult to actually select hundreds or thousands of music files without the display unit.

In other words, in the case of a player that plays music stored in one storage medium (cassette tape, CD, MD, etc.) such as a conventional cassette tape player, CD player, or MD player, the user may play about 20 songs. It was possible to remember the front and back relationship of the music, but due to the increase in storage capacity, it is difficult for the user to remember the front and back relationship of the music file, and even if it is remembered, it is still difficult to search for the desired music file among the numerous music files.

Korean Registered Patent 358,006 discloses an apparatus and method for searching for a desired piece of music by a user's voice and scale. In other words, the voice signal generated by the user is used to search for a music file. In general, the user may not provide a clear pitch and time signature for a specific music, and a malfunction of the device may be caused by noise input according to the surrounding environment. .

Accordingly, there is a need for the emergence of an effective method for searching for a specific music file desired by a user in a device in which a large amount of music files are stored.

An object of the present invention is to search for a music file having a similar rhythm by comparing an operation rhythm extracted from an inertial signal generated by an inertial sensor with a rhythm of a previously stored music file.

The objects of the present invention are not limited to the above-mentioned objects, and other objects which are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a file retrieval apparatus according to an embodiment of the present invention includes an inertial sensor for detecting a motion, a rhythm extractor for extracting a motion rhythm from an inertial signal generated according to the detected motion, and a pre-stored file And a file search unit for searching for a music file having a rhythm similar to the operation rhythm, and an output unit for outputting the searched music file.

The file search method according to an embodiment of the present invention includes the steps of detecting an operation, extracting an operation rhythm from an inertial signal generated according to the detected operation, and music having a rhythm similar to the operation rhythm among previously stored files. Retrieving a file and outputting the retrieved music file.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be appreciated that the combination of each block in the accompanying block diagram and each step in the flowchart may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that instructions executed through the processor of the computer or other programmable data processing equipment may not be included in each block or flowchart of the block diagram. It will create means for performing the functions described in each step. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of each step of the block diagram. Computer program instructions It is also possible to mount on a computer or other programmable data processing equipment, so a series of operating steps are performed on the computer or other programmable data processing equipment to create a computer-implemented process to perform the computer or other programmable data processing equipment. It is also possible for the instructions to provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

In addition, each block or step may represent a portion of a module, segment or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative implementations, the functions noted in the blocks or steps may occur out of order. For example, the two blocks or steps shown in succession may in fact be executed substantially concurrently or the blocks or steps may sometimes be performed in the reverse order, depending on the functionality involved.

1 is a conceptual diagram illustrating a file searching process according to an exemplary embodiment of the present invention.

An inertial sensor displays the inertial force of a mass generated by acceleration or angular velocity as a deformation of an elastic structure connected to the mass, and then displays the deformation of the structure as an electrical signal using appropriate sensing and signal processing techniques.

Since the 1990s, the development of micro-electromechanical systems using semiconductor processes has made it possible to miniaturize and mass produce inertial sensors. Inertial sensors are divided into acceleration sensors and angular velocity sensors, and there are various application fields as well as position and attitude control of the Ubiquitous Robotic Companion (URC). Inertial sensors are currently in the spotlight in applications such as vehicle suspension and brake integrated control, airbags and car navigation systems. The present invention can also be applied to data input devices of portable information devices such as portable navigation systems, wearable computers and PDAs to be applied to mobile communication composite terminals. Recently, inertial sensors have been applied to mobile phones and applied to continuous motion recognition and 3D games, and these products have been sold. In the aerospace sector, it can be applied not only to general aircraft navigation systems but also to micro air vehicles, missile attitude control systems, and military personal navigation systems.

As described above, an inertial sensor may be used as an input device of the portable terminal, which may be implemented by installing an inertial sensor on the portable terminal or by connecting a separate input device provided with the inertial sensor to the portable terminal.

Here, by corresponding the data generated by the inertial sensor to a function provided in the portable terminal, the user can use the movement of the inertial sensor to perform a specific function. For example, the user may reproduce a predetermined sound effect by reciprocating the portable terminal, and may display the corresponding figure by exercising in a specific figure shape.

In addition, the inertial sensor may be used to search for a music file as in the present invention. When the user applies an operation 110 corresponding to a rhythm of a specific music file to a file search apparatus equipped with an inertial sensor, the inertial sensor is input. Generate an inertial signal 120 for. The file search apparatus analyzes the generated inertial signal 120 to extract the input motion rhythm 125, and compares the extracted motion rhythm 125 with the rhythm 135 of the stored music file 130. Search for rhythm music files. Here, when there are a plurality of searched music files, the file search apparatus may display a list of searched music files using display means or the like.

In addition, the user may perform a more detailed search by inputting an operation other than the first input operation to the displayed music file.

2 is a block diagram illustrating a file searching apparatus according to an exemplary embodiment of the present invention, wherein the file searching apparatus 200 includes an inertial sensor 210, a rhythm extracting unit 220, a storage unit 230, and a file searching unit 240. ), A first rhythm analyzer 250, a second rhythm analyzer 260, and an output unit 270.

The inertial sensor 210 serves to detect motion. The inertial sensor 210 includes at least one of an acceleration sensor and an angular velocity sensor. The inertial force of the mass generated by the acceleration or the angular velocity is expressed as a deformation of the elastic structure connected to the mass, and then the structure is applied using an appropriate sensing and signal processing technique. The deformation of is expressed as an electrical signal.

In this case, the inertial sensor 210 may be included in the file retrieval apparatus 200, and the electrical signal generated through a wired or wireless communication means in the state of being included in a separate device to the file retrieval apparatus 200. You can also pass it.

The motion sensed by the inertial sensor 210 may include not only a two-dimensional motion that is a straight line or a curve, but also a three-dimensional motion composed of a combination of a straight line and a curve. In other words, as a series of electrical signals are generated for one basic operation in two or three dimensions, the user may combine the plurality of basic operations to generate a desired operation.

In this case, the previous operation and the subsequent operation may be distinguished, which may be determined by the start of the operation or the end time according to the input of a predetermined button or the absence of the operation for a predetermined time.

The rhythm extractor 220 serves to extract the motion rhythm from the inertial signal generated according to the motion detected by the inertial sensor 210. Here, the operation rhythm includes a rhythm implemented by at least one inertial signal of an acceleration signal and an angular velocity signal, and the rhythm extractor 220 beats a waveform that exceeds a predetermined threshold value among waveforms of the inertial signal. It is to set and extract the motion rhythm according to the time interval between beats.

When an operation is input and an electrical signal is analyzed and an inertial signal is generated, the rhythm extractor 220 divides the inertial signal into predetermined regions to extract the rhythm. Zones are inertial signals separated by a predetermined point of time, and the point of time at which the direction of inertia force is changed in each axis on the space included in the inertial signal may be formed as the boundary.

In other words, the magnitude of inertial force formed on one axis in space changes with time, and the point of time when the direction of inertia force is changed, that is, increasing, decreasing or decreasing, increases as a boundary of the zone. The length of this boundary is the rhythm.

The storage unit 230 stores music files. Here, the music file includes not only MIDI, MP3, M3U, RA, WMA, WAV, CDA, AU, AIF files composed of music data but also video files such as MPEG, WMV, and AVI.

In addition, the storage unit 230 may separately store data about the rhythm of each music file, and the data about the rhythm may include only the length component of the note formed by the music file. That is, the score of the music file including only the length component of the note may be stored in the storage 230.

The storage unit 230 may include a hard disk, a flash memory, a Compact Flash Card, a Secure Digital Card, an SD Card, a Smart Media Card, an MMC Card, a Memory Stick, or the like. As a module capable of inputting / outputting information, the module may be provided inside the file retrieval apparatus 200 or may be provided in a separate device.

The file search unit 240 searches for a music file having a rhythm similar to the motion rhythm extracted by the rhythm extracting unit 220 among the music files previously stored in the storage unit 230.

To this end, the file search unit 240 may use the results calculated from the first rhythm analyzer 250 and the second rhythm analyzer 260.

The first rhythm analyzer 250 calculates a difference (hereinafter, referred to as a first error) between the motion rhythm and the quantized motion rhythm. In order to reflect an error generated in each bit in the operation rhythm input by the user to the file search, whether or not to apply the same may be selected by the user.

A detailed description of the first error calculation process of the first rhythm analyzer 250 will be described later with reference to FIG. 3.

The second rhythm analyzer 260 calculates a difference (hereinafter referred to as a second error) between a rhythm included in a predetermined region of a music file to be analyzed and a motion rhythm among music files previously stored in the storage 230. Play a role. That is, a search for a predetermined area of the music file having the smallest error with the area of the operation rhythm may be performed for the entire area of the music file or may be performed for a partial area of the music file. It may also be performed only for the selected music file among the stored music files.

A detailed description of the second error calculation process of the second rhythm analyzer 260 will be described later with reference to FIG. 4.

The output unit 270 outputs the retrieved music file. That is, as a voice or a screen output, the display unit 200 may further include a display unit to output a screen. The display unit may display a liquid crystal display (LCD), a light-emitting diode (LED), an organic light-emitting diode (OLED), or a plasma display (LCD) capable of displaying an input image signal. It is a module equipped with image display means such as PDP, Plasma Display Panel, and serves to display the received image information.

3 is a conceptual diagram illustrating a first error calculation process according to an embodiment of the present invention.

The motion input by the user is sensed by the inertial sensor 210, and the rhythm extractor 220 extracts the rhythm from the waveform of the detected motion.

In the user inputting the motion, it is difficult for the user to input the motion in accurate tempo and time. Accordingly, the first rhythm analyzer 250 calculates an error thereof, and calculates a difference between the motion rhythm 310 input by the user and the quantized motion rhythm 320 as described above.

The difference D 330 between the motion rhythm A 310 and the quantized motion rhythm B 320 is defined as follows.

In Equation 1, n is the number of bits detected by the rhythm extractor 220 among inertial signal waveforms input by the user.

The quantized motion rhythm 320 may be determined according to the speed table 350 stored in the storage 230. The speed table 350 is configured to include the number of beats per minute and the length (per hour) per beat for fast items such as Adagio, Andante, Moderato, Allegro, and the like. In the speed table 350 illustrated in FIG. 3, the number of beats per minute of each speed item is input as an average value for a general speed item, and may be classified into more detailed speed items according to implementation.

The user may select a speed and a beat before inputting an action, and quantization of the motion rhythm 310 is performed according to the input speed and time. Here, the file search apparatus 200 may output a metronome sound effect according to the speed input by the user. For example, the speeds and beats selected by the user are moderato and 4/4 beats, respectively, and each bit length of the motion rhythm 310 input by the user in one word is 0.2 seconds, 0.25 seconds, 0.6 seconds, 0.2 seconds, If it is 0.25 second and 0.5 second, the beat of the model in the fast table 350, that is, the quarter note length is 0.5 second, so the input motion rhythm 310 is 0.25 second, 0.25 second, 0.5 second, 0.25 second, 0.25 second. And an operation rhythm 320 quantized in 0.5 seconds.

In addition, the first rhythm analyzer 250 may calculate the first error 300 by referring to the frequency 340 of the note. For example, the first rhythm analyzer 250 may be smaller than the quarter note and the eighth note, which are relatively frequently used. By giving a weight and giving a high weight to the other notes, it is reflected in the first error calculation.

As described above, the user may select a speed. In the speed table 350, a user may select a specific speed item, and may select his own number of beats per minute while adjusting the speed of the output metronome.

4 is a conceptual diagram illustrating a second error calculation process according to an embodiment of the present invention.

In inputting an operation to search for a music file, the user may not input a note on a score included in the music file as a correct operation. For example, a musical note contained in a music file is composed of two eighth notes, but the user misinterprets it as one quarter note and enters an action of one quarter note, or a musical note included in a music file is 4 It consists of one quarter note, but the user can mistake it for two eighth notes and input two eighth notes.

Accordingly, the second rhythm analyzer 260 may refer to the previously input motion rhythm and the previous rhythm of the music file when comparing the motion rhythm with the rhythm of the music file to compensate for the error of the user.

Equation 2 shows that the error D ( R _n , I _m ) 410 between the bit I of the currently input motion rhythm and the bit R of the rhythm currently compared among the rhythms of the music file is calculated.

는 음악 파일의 리듬 비트에 대한 가중치로서 본 발명에서 R _n /2의 값이 사용된다. 마찬가지로,

는 동작 리듬 비트에 대한 가중치로서 본 발명에서 I _m /2의 값이 사용된다.In Equation 2, n and m mean identification numbers of R and I , respectively. And,

Is a weight for the rhythm beat of the music file, and the value of R _n / 2 is used in the present invention. Likewise,

Is a weight for the operation rhythm beat, and a value of I _m / 2 is used in the present invention.

는 R _n 과 I _m 간의 직접적인 차이를 나타낸다.And,

_Represents a direct difference between R _n and I _m .

As a result, the error D ( R _n , I _m ) 410 between the beat I of the currently input motion rhythm and the beat R of the rhythm currently compared among the rhythms of the music file is D ( R _n , I _{m −1} ) 420a. , D ( R _{n -1} , I _{m -1} ) 420b, D ( R _{n -1} , I _m ) 420c.

450 is an exemplary diagram for calculating the second error 400, wherein the beats of the motion rhythm are 0.4, 0.6, 1.0, 0.4, 0.6, and 1.0, and the beats of the rhythms currently compared among the rhythms of the music file are 1.0, 0.5, The case of 0.5, 1.0, 0.5, and 0.5 is shown.

The operation starts at the bottom left, D ( R ₁ , I ₁ ) , but the values of D ( R ₀ , I ₀ ) , D ( R ₀ , I ₁ ) , D ( R ₁ , I ₀ ) are not defined. Perform only operations on Match ( R ₁ , I ₁ ) . Thus, Match (1, 0.4) = | 1-0.4 | Since 0.6 is 0.6, 0.6 is input to D ( R ₁ , I ₁ ) .

In calculating D ( R ₁ , I ₂ ) , the values of D ( R ₀ , I ₁ ) , D ( R ₀ , I ₂ ) are undefined, so D (R ₁ , I ₁ ) + w _I Perform only operations Thus, 0.9 is input to D ( R ₁ , I ₂ ) since D ( R ₁ , I ₁ ) + w _I = 0.6 + 0.3 = 0.9.

In calculating D ( R ₂ , I ₁ ) , the values of D ( R ₁ , I ₀ ) , D ( R ₂ , I ₀ ) are not defined, so D (R ₁ , I ₁ ) + w _R Perform only operations Thus, 0.85 is input to D ( R ₂ , I ₁ ) since D ( R ₁ , I ₁ ) + w _I = 0.6 + 0.25 = 0.85.

In calculating D ( R ₂ , I ₂ ) , the values of D ( R ₁ , I ₁ ) , D ( R ₂ , I ₁ ), D ( R ₁ , I ₂ ) are defined, so D (R ₁ , I ₂ ) + w _R , D ( R ₁ , I ₁ ) + Match ( R ₂ , I ₂ ) , D ( R ₂ , I ₁ ) + w _I Thus, D (R ₁ , I ₂ ) + w _R = 0.9 + 0.25 = 1.15 and D ( R ₁ , I ₁ ) + Match ( R ₂ , I ₂ ) = 0.6 + 0.1 = 0.7 and D ( R ₂ , I ₁ ) + w _I = 0.85 + 0.3 = 1.15, so the smallest value of 0.7 is entered into D ( R ₂ , I ₂ ) .

Through this process, the value of D ( R ₆ , I ₆ ) , which is the upper right corner, is calculated, and the value input to D ( R ₆ , I ₆ ) becomes the second error 400.

The file search unit 240 searches for a music file including an area having the smallest error value among the stored files after adding up the values of the first error 300 and the second error 400. In this case, the file search unit 240 may search a list of music files having an error value included in a range of a predetermined threshold value, and may perform a re-search accordingly.

5 is a flowchart illustrating a file searching process according to an exemplary embodiment of the present invention.

In order to search for a music file corresponding to the input motion rhythm, the inertial sensor 210 of the file search apparatus 200 detects motion (S510). The sensed motion is converted into an electrical inertial signal, which includes at least one of an acceleration signal and an angular velocity signal.

The converted inertial signal is transmitted to the rhythm extractor 220, and the rhythm extractor 220 extracts an operation rhythm from the received inertial signal (S520). That is, as extracting the rhythm implemented by at least one inertial signal of the acceleration signal and the angular velocity signal, in order to extract the rhythm, the rhythm extractor 220 beats a waveform that exceeds a predetermined threshold value among the waveforms of the inertial signal. Set it and extract the motion rhythm according to the time interval between beats.

The extracted motion rhythm is transmitted to the file search unit 240, and the file search unit 240 searches for a music file having a rhythm similar to the received motion rhythm among the music files previously stored in the storage unit 230. The rhythm analyzer 250 and the second rhythm analyzer 260 calculate the first error 300 and the second error 400, respectively, and thus, the first rhythm analyzer 250 and the second rhythm. The analyzer 260 calculates the first error 300 and the second error 400 (S530). The file search unit 240 searches for a music file having a rhythm similar to the operation rhythm received with reference to the calculated first error 300 and the second error 400 (S540). Detailed descriptions of the first error 300 and the second error 400 will be omitted since they have been described above with reference to FIGS. 3 and 4.

As the music file is searched, the output unit 270 outputs the searched music file (S550). In other words, a list of music files is output to a voice or a screen. There may be one music file searched by the file search unit 240 according to whether it is implemented or a plurality of music files included in a predetermined threshold range. Here, when there are a plurality of searched music files, the file search apparatus 200 receives a message indicating whether the search is completed from the user (S560). When the search completion message is input, the file search apparatus 200 ends the operation and receives the additional search message. It takes another action on the file and performs a more detailed search.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the file searching apparatus and method of the present invention as described above has one or more of the following effects.

First, by comparing the motion rhythm extracted from the inertial signal generated by the inertial sensor with the rhythm of the prestored music file, the corresponding file is searched so that a user who does not know the exact pitch can search for a specific music file. .

Second, in comparing the motion rhythm extracted from the inertial signal generated by the inertial sensor with the rhythm of the previously stored music file, the similarity is applied to the search of all the music files included in the predetermined range, and the user separately searches for this. It also has the advantage of providing flexible search.

Claims (14)

An inertial sensor for detecting motion; A rhythm extracting unit extracting a motion rhythm from an inertial signal generated according to the detected motion; A file search unit for searching for a music file having a rhythm similar to the motion rhythm among the files having a rhythm composed of a length component of a note; And And an output unit for outputting the retrieved music file. The method of claim 1, The motion rhythm includes a rhythm implemented by at least one inertial signal of an acceleration signal and an angular velocity signal. The method of claim 1, And the rhythm extractor sets a beat for a waveform exceeding a predetermined threshold value among waveforms of the inertial signal, and extracts the operation rhythm according to a time interval between the bits. delete The method of claim 1, And a first rhythm analyzer configured to calculate a first error that is a difference between the motion rhythm and the quantized motion rhythm. The method of claim 1, And a second rhythm analyzer configured to calculate a second error that is a difference between a rhythm included in a predetermined region of a file to be analyzed and the operating rhythm among the pre-stored files. The method according to claim 5 to 6, And the file search unit searches for the music file with reference to the first error and the second error. Detecting an operation; Extracting a motion rhythm from an inertial signal generated according to the sensed motion; Retrieving a music file having a rhythm similar to the motion rhythm among files having a rhythm composed of a length component of a note; And Outputting the retrieved music file. The method of claim 8, The motion rhythm includes a rhythm implemented by at least one inertial signal of an acceleration signal and an angular velocity signal. The method of claim 8, The extracting of the rhythm may include setting a beat for a waveform exceeding a predetermined threshold among waveforms of the inertial signal, and extracting the operation rhythm according to a time interval between the bits. . delete The method of claim 8, Calculating a first error that is a difference between the motion rhythm and the quantized motion rhythm. The method of claim 8, And calculating a second error which is a difference between a rhythm included in a predetermined region of the file to be analyzed and the operation rhythm among the pre-stored files. The method according to claim 12, wherein The searching of the music file may include searching the music file with reference to the first error and the second error.

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