KR20020009550A - Apparatus and method for recording digital audio data file - Google Patents

Abstract

PURPOSE: A method for recording digital audio data file is provided to record and play the digital audio data and to search the digital audio data at a high speed. CONSTITUTION: A method for recording digital audio data file comprising a file name field, a data field, and an additional information tag field, on a recording media is provided. The method comprises the steps of recording the file name field on a directory information recording area(403,409) recording the data field and additional information tag field on a data recording area(415), and recording indexing information which is used as a keyword for searching the digital audio data file on the directory information recording area.

Description

Apparatus and method for recording digital audio data file

As a widespread digital audio reproduction system, there is a compact disc reproduction system. The compact disc can store approximately 650 Mbytes of audio data, which is enough to record about 72 minutes of WAV format digital audio data sampled at 44.1KHz of analog audio data. Therefore, a compact disc can record up to 20 pieces of digital data corresponding to analog audio data of approximately 4 minutes in general. The display unit of such a compact disc playback system displays the serial number of the recorded digital audio data, and allows the user to select the serial number of the audio data to be listened to.

In addition to the compact disc system, there is an MP3 reproducing system capable of reproducing digital audio data in MP3 format, that is, MPEG2 Layer 3, which is a method of compressing digital audio data in WAV format. MP3 format digital audio data has a feature of compressing the amount of digital audio data of WAV format described above by about 12 times while maintaining the original audio quality almost intact. When recording such digital audio data in MP3 format onto a compact disc, approximately 850 minutes of analog audio data can be recorded. This corresponds to a capacity of recording approximately 200 minutes of analog audio data of about 4 minutes.

In the case of playing digital audio data recorded in the MP3 format as described above, by using the traditional song selection method adopted in the conventional compact disc playback system, about 300 pieces of audio data can be displayed, selected, and separated by only a serial number. If so, it will take considerable time to select the audio data that the user wishes to listen to among the 300 pieces of recorded audio data. In addition, due to the limitation of the human memory capacity, it is difficult to select the desired audio data by simply referring to the serial number as the number of recorded audio data becomes larger.

As a solution to this problem, there may be a method of displaying the file name of the digital audio data recorded in the MP3 format on the display unit and selecting the desired audio data therefrom. However, this method requires that a human person memorize the file name of the audio data desired to be listened to, and furthermore, selecting audio data desired to be listened from among about 300 different file names requires the desired audio data by the serial number described above. There is no difference in the selection and its difficulty.

In addition, there may be a method using an audio data related information tag defined in the MP3 format, that is, an ID3 tag. The ID3 tag refers to additional information about the audio data in the MP3 format, and this ID3 tag is inserted inside the file in the MP3 format. The portion in which the ID3 tag is inserted in the MP3 format file is called the ID3 tag recording area. 1 is a conceptual diagram showing the format of a typical MP3 file. As shown in FIG. 1, a typical MP3 file includes an ID3 tag recording area 103 in addition to the audio data recording area 101.

The method using the ID3 tag refers to displaying recorded audio data with reference to each ID3 tag and allowing the user to select desired audio data with reference to the displayed ID3 tag information. However, the method using the ID3 tag should refer to and display the ID3 tag recording area 103 of all audio data recorded on the compact disc. The larger the number of audio data, the more the ID3 tag recording area 103 of all audio data is displayed. There is a problem that the time required for access is long. In addition, ID3 tag information is not necessarily recorded in the ID3 tag recording area of the MP3 digital audio data. As described above, in the case of digital audio data in MP3 format in which additional information about audio data, that is, ID3 tag information is not recorded, the function using the ID3 tag is practically useless.

As a solution to this problem, the inventor of the present application has completed the invention relating to a method of displaying data in a digital audio reproduction system, and filed a patent application as Korean Patent Application No. 1999-001553 dated January 20, 1999. . The data display method in the digital audio reproduction system disclosed in Patent Application No. 1999-001553 utilizes a recording medium in which MP3 compression audio data files are hierarchically stored in a directory structure. According to the method, the display window of the playback system is composed of a directory structure display unit for displaying information on the directory structure and a selection item display unit for displaying information about the selected directory or file. The directory structure display unit displays the name of the hierarchical directory immediately above the selected directory, the number of subdirectories and files included in the upper hierarchical directory, and the selection item display unit displays the sequence number and playback time of the selected directory or file. In this way, the user can easily select a desired file from a recording medium in which audio data is recorded in a hierarchical directory structure.

In addition, the inventor of the present application completed the invention relating to a method for classifying and reproducing audio data stored in a digital audio recording medium, and filed a patent on February 24, 1999 as Korean Patent Application No. 1999-6058. The invention disclosed in patent application No. 1999-6058 is to provide a method capable of efficiently classifying and reproducing by making a database of additional information on audio data stored in a digital audio recording medium and a position on the recording medium of audio data. A method for classifying and reproducing audio data stored in a digital audio recording medium disclosed in Japanese Patent Application No. 1999-6058 includes: storing, by database, additional information about each audio data stored in the recording medium and a location on a recording medium of data. ; And searching for and reproducing the data desired by the user according to the field value of the database stored in the above step.

As disclosed in Patent Application No. 1999-6058, it is necessary to record additional information on a recording medium. As a first embodiment for this purpose, a file is recorded on the recording medium itself, which records a field necessary for constructing a database for the additional information. Discuss the method. In this case, when audio data is recorded on the recording medium, a file relating to additional information is recorded together, and the additional information file is read during reproduction to be used for audio data classification and reproduction.

As a second embodiment in which additional information is recorded on a recording medium, a method of inserting fields necessary for constructing a database relating to additional information into a file name or a directory name is disclosed. In this case, a field relating to additional information is inserted in the file name or directory name, and an additional information database is constructed from the file name or directory name during reproduction and used for audio data classification and reproduction.

The present invention relates to a digital audio data recording and reproducing system, and more particularly, to a digital audio data recording and reproducing system capable of retrieving digital audio data recorded on a recording medium at high speed.

1 is a conceptual diagram showing the format of a typical MP3 file.

Fig. 2 is a block diagram showing the structure of an apparatus for reading and reproducing digital audio data from a recording medium on which digital audio data to which the present invention is applied is recorded.

3 is a schematic diagram showing the structure of a digital audio data file.

4 is a schematic diagram showing a state in which a digital audio data file is recorded on a recording medium.

FIG. 5 is a conceptual diagram showing the structure of a database stored in the root directory of an ISO-9660 format CD in the playback apparatus of the digital audio recording medium shown in FIG.

6 is a conceptual diagram of a directory structure in which field values for constructing a database are put in a file name in another embodiment of the present invention.

4 is a flowchart showing background processing for configuring a database in a memory of a playback system.

<Description of the symbols for the main parts of the drawings>

401: disc information recording area

403: Root directory information recording area

405: file information

407: Subdirectory Information

409: subdirectory information recording area

415: data recording area

419: route information recording area

The present invention is a further improvement of the prior art as described above, wherein additional information is inserted together when recording digital audio data on a recording medium, and the additional information is retrieved and reproduced by using the additional information in the retrieval and reproduction operation of the digital audio data. It is an object of the present invention to provide a method and apparatus capable of speeding up operation.

Further, the present invention converts the format of a digital audio data file recorded on a recording medium, but converts the format of the digital audio data file into a format in which index information for use in retrieval of the digital audio data file is inserted, thereby speeding up the retrieval of the digital audio data file. And an apparatus.

It is also an object of the present invention to provide a method of efficiently reproducing by making a database of additional information about audio data stored in a digital audio recording medium and a position on the recording medium of audio data.

In order to achieve this object, according to the present invention, there is provided a method of recording a digital audio data file on a recording medium comprising a file name field, a data field, and an additional information tag field. The method comprises the steps of recording a file name field in a directory information recording area on a recording medium, a data field and an additional information tag field in a data recording area on a recording medium, and an index to be used as a keyword when searching for a digital audio data file. Recording information in the directory information recording area.

According to the present invention, the file name field included in the digital audio data file is recorded in the directory information recording area on the first recording medium, and the data field and the additional information tag field are recorded in the data recording area on the first recording medium. A method for recording an audio data file on a second recording medium is provided. The method includes recording a file name field in a directory information recording area on a second recording medium, recording a data field and an additional information tag field in a data recording area on a second recording medium, and retrieving a digital audio data file. Recording the index information to be used as a keyword in a directory information recording area on the second recording medium.

According to the present invention, a method of recording digital audio data recorded on a CD in a CD audio format on a recording medium. The method includes reading digital audio data recorded on a CD to extract data, generating a file name and additional information tag, recording the file name in a directory information recording area on a recording medium, digital audio data and additional information. The tag includes recording in a data recording area on the recording medium, and recording, in the directory information recording area on the recording medium, index information to be used as a keyword when searching for the digital audio data file recorded on the recording medium. do.

A method of classifying and reproducing audio data stored in a digital audio recording medium according to the present invention comprises the steps of: storing, by database, additional information about each audio data stored in the recording medium and a location of the data on a recording medium; And retrieving and reproducing the data desired by the user according to the field value of the database stored in the above step.

The database storage step may include storing a database of additional information of audio data and a location on a recording medium in a directory of the recording medium when the recording medium is produced, or a field to be databased in a file name or a directory name when producing the recording medium. It is also possible to introduce a file name and a directory structure in the reproduction system so as to store a database relating to the position on the recording medium of the audio data for the classification reproduction in the memory of the reproduction system.

Constructing and storing a database of additional information for classification reproduction in the memory of the reproduction system may use background processing that uses the remaining time other than the transmission time of the data required when reproducing the audio data.

1. Digital audio data, recording media and playback devices

Fig. 2 is a block diagram showing the structure of an apparatus for reading and reproducing digital audio data from a recording medium on which digital audio data to which the present invention is applied is recorded.

The reproducing apparatus 200 shown in FIG. 2 is an apparatus for reading and reproducing digital audio data while driving the recording medium 201. The digital audio data reproducing apparatus 200 to which the present invention is applied includes a recording medium reading unit 203 for reading recording information from the recording medium 201, and a digital processing unit 205 for extracting digital information from the read recording information and performing appropriate processing. ), A decoding unit 207 for decoding a digital information signal to generate a digital audio signal, a digital analog converter 209 for converting a digital audio signal into an analog signal and providing the same to an audio signal output device, and a recording medium 201. A drive unit 211 for moving the recording medium 201 or the reading means in synchronization with the recording medium reading operation to change the reading position on the input unit, an input unit 213 for receiving a predetermined command from the user, and the recording medium 201. Information about the display unit 219 and the recording medium 201 for displaying information relating to the digital audio data or additional information. And a main memory 215 and secondary memory 217, and a control section 231 for controlling each section for recording audio data, or side information, or information with respect to these generated temporarily.

The recording medium 201 includes all of the recording medium 201 capable of recording digital data such as a compact disk (CD), an optical or magnetic disk such as MD, DVD, MO, or the like. If digital data can be recorded, a medium such as a hard disk or diskette is also included in the recording medium 201 according to the present invention.

In this specification, a unit for recording an audio signal to be continuously reproduced is referred to as a digital audio data file. That is, when one file is played back, the digital audio data recorded in the file is defined to be continuously played unless otherwise indicated. Usually, in the case of digitizing music, one song is recorded in the form of one file. The digital audio data file has a format in which an audio signal is digitized without data compression such as the PCM scheme, and a format digitized with data compression such as the MP3 scheme.

3 is a schematic diagram showing the structure of one digital audio data file. Each digital audio data file may be composed of a file name (FN) field, a file attribute (FA) field, a data (FD) field, an additional information tag (FT) field, and the like.

The digital audio data file having the structure as shown in FIG. 3 can be recorded on various recording media, which are recorded according to the rules of the file system according to the characteristics of the recording medium. 4 is a schematic diagram showing a state where a plurality of digital audio data files are recorded on a recording medium according to a predetermined file system rule. The recording medium of Fig. 4 shows an optical recording medium for one write multiple read, for example, a CD-ROM.

As shown in Fig. 4, the recording medium includes a disc information recording area 401 including a table of contents (TOC), a root directory information recording area 403, a subdirectory information recording area 409, and a data recording area. 415 and the like are assigned.

In the disc information recording area 401, information unique to the recording medium such as the name of the recording medium, the total recording capacity, and the recording time point is recorded. This disc information recording area 401 may include a TOC and a volume presenter VD. In particular, the volume presenter VD has information indicating the position of the directory path information recording area 419 which will be described later.

In the root directory information recording area 403, file information 405 and lower directory information 407 included in the highest directory, that is, the root directory, are recorded. The subdirectory information recording area 409 includes file information 411 included in the directory and subdirectory information 407 of the subdirectory of the root directory and subdirectories such as the subdirectory. In the data recording area 415, data and tags related to the file information 405 and 411 included in the directory information recording areas 403 and 409 are recorded. The recording medium may further include a directory path information recording area 419. The directory path information recording area 419 records path information of all directories recorded on the recording medium. The directory path information recording area 419 can be read with reference to the volume presenter VD as described above.

In the directory information recording areas 403 and 409, file information 405 and subdirectory information 407 recorded in the directory are recorded. The file information 405 includes a file name field FN, a file attribute field FA, a data recording address field FC, and the like. The subdirectory information 407 includes a directory name field DN and a directory attribute field DA. ), And the like. Depending on the file system employed, an extra field FE may be further provided in the file information 405 and the subdirectory information 407. Data FD and tag information FT associated with the file information 405 are recorded at an address on the data recording area 415 indicated by the data recording address field FC of the file information 405.

Although FIG. 3 mainly describes an optical recording medium for one write multiple read as an example, a file system using a file allocation table (FAT) can be employed in the case of multiple write multiple read write media such as a hard disk and a floppy disk. have. That is, the data recording address field FC may not point directly to an address on the data recording area, but may point to an address on the file allocation table FAT and the file allocation table FAT to point to a position on the recording area.

That is, as shown in Fig. 3, the file name FN, file attribute FA, data FD, and additional information tag FT constituting the digital audio data file are shown in Fig. 4 on the recording medium. Similarly, the directory information recording areas 403 and 409 and the data recording area 415 are recorded in accordance with file system rules suitable for the recording medium.

When a digital audio data file is recorded according to the file system as shown in Fig. 4, a process of accessing a predetermined digital audio data file will be described. Such a file system is typically managed by a computer and an operating system operating on the computer. It can also be managed by a digital audio reproduction device as shown in FIG. In some cases, the computer, operating system, or application program operable on the digital audio data reproducing apparatus will handle the digital audio data file access procedure. In this specification, a computer, an operating system, a digital audio data reproducing apparatus, or an application program that manages a file system as shown in FIG. 4 is referred to as a management system.

First, a process of receiving a file name and accessing the file name as a keyword will be described. Upon receiving the file name, the management system searches the sub directory information recording area 409 one by one starting from the root directory information recording area 403, and retrieves the input file name from the file information in the directory information recording areas 403 and 409. Comparison is made with the file name field FN in (405, 411). As a result of the comparison, when a file name field FN in which a file name identical to the input file name is recorded is found, referring to the data address recording field FC corresponding to the file name field FN, desired digital audio on the data recording area 415 is obtained. Data FD can be accessed.

Secondly, the process of accessing a file by receiving additional information as a keyword will be described. This process is utilized when the user cannot store the file name of the audio data to be accessed and stores only the additional information related to the audio data, for example, the name of the song, the composer or the performer, or the genre. When the management system receives the additional information, the management system retrieves the file information recorded in the directory information recording areas 403 and 409, starting from the root directory information recording area 403 and searching all the sub directory information recording areas 409 one by one. With reference to all, the data address recording field FC in each file information is extracted. Then, the additional information tag field FT on the data recording area 415 indicated by each data address recording field FC is searched. When the tag field FT in which additional information identical to the input additional information is recorded is found, the desired digital audio data FD can be accessed on the data recording area 415 with reference to the data address recording field FC. .

As is clear from the above description, the access procedure is different in the case of referring to a file name and in the case of referring to additional information in order to access desired digital audio data. That is, when referring to the file name, only the directory information recording area 403 in the file system needs to be searched. However, when referring to the additional information, not only the directory information recording area 403 but also the data recording area 415 are searched and the additional information is referred to. All tag fields 417 must be read. As a result, it can be seen that accessing a file with reference to additional information takes much more time than referring to a file name.

2. Digital audio data file format

According to the present invention, in recording the file name (FN), file attribute (FA), data (FD), and additional information tag (FT) constituting the digital audio data file on the recording medium, the file name (FN), file The attribute FA is recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT are recorded in the data recording area 415, together with retrieval of the digital audio data. Additional information to be used as a keyword is recorded in the directory information recording areas 403 and 409. In this specification, the format of the digital audio data file in which the additional information to be used as a keyword when retrieving digital audio data recorded on the recording medium is recorded in the directory information recording areas 403 and 409 is defined as a FIF format. In addition, additional information to be used as a keyword in the FIF format is defined as index information.

According to a preferred embodiment of the present invention, index information to be used as a keyword when retrieving digital audio data is recorded, particularly in the file name field FN, of the directory information recording areas 403 and 409. In this case, in a predetermined operating system, for example, DOS or Windows, index information of the digital audio data can be represented by a file name.

According to another embodiment of the present invention, index information to be used as a keyword when retrieving digital audio data is recorded in the predetermined fields of the directory information recording areas 403 and 409 except for the file name field FN. That is, index information to be used as a keyword is recorded in the attribute field FA or the redundant field FE. In this case, in a predetermined operating system, for example, DOS or Windows, index information of the digital audio data is recorded in the form of hidden information that cannot be recognized through the file name. The recording medium thus recorded appears to have recorded a digital audio data file having a conventional file name through a conventional computer, an operating system, or a digital audio data reproducing apparatus. However, if a specific application program according to the present invention is used, it is possible to display additional information together with the file name in addition to the usual file name.

According to the present invention, when retrieving the desired digital audio data by using the additional information of the digital audio data to be reproduced as a keyword, the reproduction device 200 only needs to read up to the directory information recording areas 403 and 409 of the recording medium. It is sufficient and there is no need to access the data recording area 415. Thus, the retrieval time of digital audio data can be significantly shortened.

According to a preferred embodiment of the present invention, as the keyword for digital audio data retrieval, it is possible to use the song name, composer or performer of music formatted in the audio data file, and additional information about the genre of music. In this case, each additional information is preferably separated through a predetermined delimiter. For example, in the embodiment using the so-called FIF format in which the additional information is recorded in the file name field FN, the case where the additional information is distinguished using the file names field FN using "[" and "]" is an example. Can be mentioned. In this case, in a predetermined operating system, for example, DOS or Windows, the file name of the digital audio data file in the FIF format can be expressed in the form of [[playing artist] [song name] [genre] .extension]. The type and insertion order of the index information for digital audio data retrieval are not limited to the above embodiments and various forms and applications are possible, and the spirit of the present invention should not be interpreted limitedly to the contents disclosed in the above embodiments. For example, the file name of the digital audio data file may be in the form of "[song name] [singer] [genre] .extension", and "[song name] [singer] [genre] [other additional information] .extension" The form of is also possible.

3. Method, device, and program to insert index information

According to a preferred embodiment of the present invention, a method, apparatus, and program are provided for converting a digital audio data file into the above-described FIF format. The present method records the file name (FN), file attribute (FA), data (FD), and additional information tag (FT) constituting the digital audio data file on the recording medium, wherein the file name (FN), file The attribute FA is recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT are recorded in the data recording area 415, together with retrieval of the digital audio data. Additional information to be used as a keyword is recorded in the directory information recording areas 403 and 409.

According to a preferred embodiment of the present invention, additional information to be used as a keyword when retrieving digital audio data is recorded in the directory information recording areas 403 and 409, particularly in the area where the file name field FN is recorded. According to another embodiment of the present invention, additional information to be used as a keyword when retrieving digital audio data is recorded in a predetermined area of the directory information recording areas 403 and 409 except for the area in which the file name field FN is recorded. do. That is, the additional information to be used as a keyword is recorded in the attribute field FA or the extra field FE.

At this time, as a method of acquiring additional information to be used as a keyword when searching the digital audio data, there may be a method of directly inputting from a user and a method of extracting additional information from the additional information tag FT.

According to the former, in the case of using a song name, composer or performer of music formatted as the audio data file as a keyword for digital audio data retrieval, and additional information about the genre of music, the song name, composer or performer, and Additional information about the genre of music is directly input by the user. In the latter case, these additional information is obtained by reading from the song name, composer or performer of the additional information tag FT of the digital audio data file, and the genre field of music.

4. Methods, devices, and programs for converting digital audio data formats

According to the present invention, there is provided a method, apparatus and program for converting a conventional digital audio data format into a digital audio data format in an indexed format according to the present invention.

In this method, a file name (FN), a file attribute (FA), data (FD), and an additional information tag (FT) constituting a digital audio data file are recorded on a recording medium, but the file name (FN), file attribute ( FA) is recorded in the directory information recording areas 403 and 409, and when the data FD and the additional information tag FT are recorded in the data recording area 415, keywords are retrieved when the digital audio data is retrieved. By recording additional information to be used in the directory information recording areas 403 and 409, the format of the digital audio data is converted into the format according to the present invention.

According to a preferred embodiment of the present invention, format conversion is performed by recording additional information to be used as a keyword when retrieving digital audio data, particularly in the directory information recording areas 403 and 409, in which the file name field FN is recorded. do. According to another embodiment of the present invention, additional information to be used as a keyword when retrieving digital audio data is recorded in a predetermined area of the directory information recording areas 403 and 409 except for the area in which the file name field FN is recorded. By doing format conversion. That is, the additional information to be used as a keyword is recorded in the attribute field FA or the extra field FE.

At this time, the method of obtaining additional information to be used as a keyword when searching the digital audio data may be applied as it is to the method of applying the additional information and the apparatus described above. Therefore, detailed description thereof will be omitted.

5. Method, apparatus, and program for recording digital audio data on recording medium

According to the present invention there is provided a method, apparatus, and program for recording a digital audio data file on a recording medium in the form of a format according to the present invention.

The method records a file name (FN), a file attribute (FA), data (FD), and an additional information tag (FT) constituting a digital audio data file on a recording medium, but the file name (FN), file attribute (FA). ) Is recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT are recorded in the data recording area 415, and the additional information to be used as a keyword when searching the digital audio data is added. Information is recorded in the directory information recording areas 403 and 409.

According to an embodiment of the present invention, there is provided a method of receiving a digital audio data file recorded on a first recording medium and recording the same in an FIF format according to the present invention on a second recording medium. In the first recording medium, the file name FN and file attribute FA constituting the digital audio data file are recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT. Is recorded in the data recording area 415. While recording this on the second recording medium, the file name FN and the file attribute FA are recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT are in the data recording area 415. ), And additional information to be used as a keyword when retrieving the digital audio data is recorded in the directory information recording areas 403 and 409. This embodiment is particularly useful when the first recording medium and the second recording medium have different file systems. In the case where the first recording medium is a floppy disk and the second recording medium is a hard disk, the digital audio data file recorded on the floppy disk is copied to the hard disk while the file format is converted into the FIF format according to the present invention for recording. It is.

6. Program that automatically converts conventional CD data into compressed digital audio data

According to the present invention, a method, an apparatus, and a program for converting digital audio data recorded on a CD in a CD audio format to an FIF format according to the present invention are provided.

The method reads a digital audio data file recorded in a CD audio format on a CD, extracts the digital audio data, encodes the data into a desired format, generates the target data (FD), and generates a file name, file attribute ( FA) and the additional information tag (FT), and record the file name (FN), file attribute (FA), data (FD), and additional information tag (FT) on the recording medium, but the file name (FN), file The attribute FA is recorded in the directory information recording areas 403 and 409, and the data FD and the additional information tag FT are recorded in the data recording area 415. When searching for the digital audio data, the keyword FA is used as a keyword. Additional information to be used is generated and recorded in the directory information recording areas 403 and 409.

According to one embodiment of the invention, it is preferable to perform data compression with a predetermined compression algorithm before recording the digital audio data recorded on the CD in the CD audio format on the recording medium. For example, the digital audio data recorded in the CD audio format may be a file modulated by the PCM method or a file in the WAV format, or may be recorded on a recording medium after data compression such as an MP3 compression algorithm. In this case, for example, the MP3 compression algorithm can be adopted as the compression algorithm.

At this time, as a method of obtaining additional information to be used as a keyword when searching the digital audio data, there may be a method of directly inputting from a user and a method of accessing and extracting a CD information database.

According to the former, in the case of using a song name, composer or performer of music formatted as the audio data file as a keyword for digital audio data retrieval, and additional information about the genre of music, the song name, composer or performer, and Additional information about the genre of music is directly input by the user. In the latter case, the CD information database is accessed to acquire the name, composer or performer of the digital audio data file, and genre of music using information unique to the audio CD as a keyword.

The CD information database refers to a database in which various additional information about the audio CD is recorded based on unique information of each audio CD. Such a database is typically accessible through a communication network such as the Internet. In addition, in the CD information database, information about a number of audio CDs, such as a song name, a composer or a player, and a genre of music, is recorded. A user who wants to obtain detailed information about a given audio CD accesses the CD information database through a communication network and transmits the unique information of the audio CD to the CD information database. The CD information database matches the transmitted unique information with the audio. Retrieve the data and send additional information about it to the user.

As information unique to audio CDs for distinguishing various audio CDs from each other in the CD information database, in the case of the file system as shown in FIG. 4, the name and total recording capacity of the audio CD recorded in the disc information recording area 401 Information unique to the audio CD such as recording time and recording time can be used.

7. Method of classifying and playing back audio data stored in digital audio recording media

In the following description of the invention, 'audio data' refers to the digitized audio signal itself, and 'additional information' refers to the classification and reproduction of audio data such as the artist, genre, year of publication, album, song name, and classification symbol that produced the audio data. Means information for In addition, "positional information" means positional information for accessing audio data on a recording medium. In addition, the term "data information" refers to a database having fields of additional information and position information for classification-based reproduction of audio data.

The first embodiment of the method according to the invention is a method of making a database on the recording medium itself. For example, when organizing a CD by storing songs on a CD, a database is created as a file and stored on the CD. The playback system reads this file to find out all the information needed for the classification playback on the CD. Corresponds to a playback request for each category.

FIG. 5 is an example of the contents of a database stored on an ISO-9660 format CD in the reproduction system of the digital audio recording medium shown in FIG.

As shown in Fig. 5, the database stored in the CD can store the song name, singer, genre, classification number, year, album, and positional information on the CD of the song.

When placed in the root directory of a CD, such a database can be quickly accessed from the CD, and once read at the first time, it has databaseized information for classification playback. Therefore, you can sort the configured database without having to access the ID3 tag of each file for playback of each song's classification, and go directly to the song using the location information stored in the database. do.

For example, if the user wants to play a classification by singer at the time of playback, the playback system shows a list of singers in the database, and if the user wants to play only songs of the singer 'A', the playback system may use the singer ' A list of songs will be displayed. In the database as shown in FIG. 5, the song 1 and the song 2 are displayed, and when the user selects the song 1, the user directly accesses the location of the song 1 using the location information of the song 1 in the database. Tables, directory information, and audio data can be analyzed to reduce the time required to find a song.

In another embodiment of the method for classifying and reproducing audio data stored in a digital audio recording medium according to the present invention, a database is composed of only a file name or a directory name by inserting fields necessary for database configuration into a file name or a directory name. This is a method of configuring a database in memory by using the location information of a file in a file name or a directory name and the location information of a file by using the location information of each file in the file. That is, when constructing and producing a CD, additional information necessary for classification and reproduction is put in a file name or a directory name, and a database is constructed in the memory of the reproduction system using the file name or directory name, and the classification and reproduction are performed through this. In this way, it is possible to fill each field information of the database simply by searching the route table and directory information without having to search the ID3 tag in each song. Since it has additional information and song position information, it is possible to play a song with one random access after the classification.

Figure 6 shows an example of a directory structure in which field values of a database are put in a file name in another embodiment of the present invention.

Fig. 6 is an example of a directory structure created by using a long file name using an extension of the ISO-9660 file system. Songs under each directory display additional information such as song name, artist, album name, genre and classification number, and year of publication in the file name.

The playback system reads the CDD's PVD to determine the location of the path table, reads the CD's directory structure, and reads each directory record to read the file name contained in the directory. At this time, the database is constructed in the memory by the location information of the file contained in the directory record and the database field value information included in the file name. The configured database enables files to be categorized and reproduced according to the needs of users.

In this way, the playback system can have a database for classification-specific playback using only the ISO-9660 route table and directory information, thus eliminating the time for directly acquiring and comparing additional information for all audio data by accessing the respective audio data. can do.

As such, configuring the database in the memory of the playback system is also possible with background processing.

When a CD is first inserted into a playback system, the playback system uses a PVD and a path table to determine the directory structure, and then enters a user input standby mode and reads and sorts files.

The data rate required to play the file selected by the user's request is 16KByte / sec when the file is encoded at 128Kbps. Therefore, the remaining 134KByte / sec is transmitted when performing the 1x speed operation (speed of about 150KByte / sec) You can use the available time to construct a database. In the same way, when double speed is used, the time to transfer 284 KByte / sec can be used to construct a database. In the present invention, this is referred to as 'background processing'.

7 shows background processing for configuring a database in a memory of a playback system.

In Fig. 7, the details of the CD unit, the micro-control unit, and the MP3 decoder unit are the portions that operate simultaneously. The CD unit reads and buffers the song 1, and after the micro-controller transmits the buffered data, finds the song 2, reads and classifies the ID3 tag, and reads and buffers the song 1 again. This operation continues in the same manner while reading and classifying the song 3, so that playback by additional information for classifying playback after the entire database has been completed is possible.

As described above, according to the present invention, by constructing a database of additional information about audio data stored in a digital audio recording medium and location information of audio data, a field-specific search constituting the database can be performed. There is an advantage that the user can find and play the desired song quickly.

In addition, when acquiring additional information in a directory name or a file name when acquiring a database from a CD-ROM (or a digital recording medium) to provide a classification reproducing function, the reproducing system reads the necessary information for the database if only the directory recording is read. Since all of them can be obtained, it is possible to save the time required to search all files individually than the conventional method, so that it is possible to respond to the user's classification and display requirements in a very short time.

According to the present invention, index information is inserted together when recording digital audio data on a recording medium, and the search and playback operations can be speeded up by using the index information during the search and playback operations of the digital audio data.

According to the present invention, when retrieving the desired digital audio data by using the additional information of the digital audio data to be reproduced as a keyword, the reproduction device 200 only needs to read up to the directory information recording areas 403 and 409 of the recording medium. It is sufficient and there is no need to access the data recording area 415. Thus, the retrieval time of digital audio data can be significantly shortened.

According to the present invention, there is also provided a method, apparatus, and program for converting digital audio data recorded on a CD in a conventional CD audio format into an FIF format according to the present invention. The recording medium converted to the FIF format according to the present invention enables audio data retrieval using additional information as a keyword, which was not possible in the conventional CD audio format. In addition, data retrieval using additional information as a keyword can be performed at high speed.

Claims (21)

A method of recording a digital audio data file on a recording medium, comprising a file name field, a data field, and an additional information tag field. Recording the file name field in a directory information recording area on the recording medium; Recording the data field and the additional information tag field in a data recording area on the recording medium; and Recording index information to be used as a keyword in the directory information recording area when searching for the digital audio data file; Recording method comprising a. The file name field included in the digital audio data file is recorded in the directory information recording area on the first recording medium, and the data field and the additional information tag field refer to the digital audio data file recorded in the data recording area on the first recording medium. A method for recording on a second recording medium, Recording the file name field in a directory information recording area on the second recording medium; Recording the data field and the additional information tag field in a data recording area on the second recording medium; and Recording index information to be used as a keyword when searching for the digital audio data file in the directory information recording area on the second recording medium; Recording method comprising a. A method of recording digital audio data recorded on a CD in a CD audio format on a recording medium, Reading digital audio data recorded on the CD to extract data; Generating a file name and an additional information tag, Recording the file name in a directory information recording area on the recording medium; Recording the digital audio data and the additional information tag in a data recording area on the recording medium; and Recording, in the directory information recording area on the recording medium, index information to be used as a keyword when searching for the digital audio data file recorded on the recording medium. Recording method comprising a. The method according to any one of claims 1 to 3, And recording the index information comprises recording the index information in an area in which the file name field on the directory information recording area is recorded. The method according to any one of claims 1 to 3, The digital audio data file is a digitized music, And the index information is any one selected from a group consisting of a song name, composer, performer, and genre of music that is the object of the digital audio data file. The method according to any one of claims 1 to 3, Prior to recording the index information, And receiving the index information. The method according to any one of claims 1 to 3, Prior to recording the index information, Extracting the index information from the additional information tag field. The method of claim 3, Before the recording of the digital audio data and the additional information tag in the data recording area, Compressing the digital audio data with a predetermined compression algorithm. The method of claim 3, Prior to recording the index information, Accessing the CD information database over the network, Extracting unique information of the CD and transmitting it to the CD information database; and Receiving the index information from the CD information database The recording method further including An apparatus for recording a digital audio data file on a recording medium, comprising a file name field, a data field, and an additional information tag field. Means for recording the file name field in a directory information recording area on the recording medium; Means for recording the data field and the additional information tag field in a data recording area on the recording medium; and Means for recording index information to be used as a keyword in the directory information recording area when retrieving the digital audio data file Recording device comprising a. The file name field included in the digital audio data file is recorded in the directory information recording area on the first recording medium, and the data field and the additional information tag field refer to the digital audio data file recorded in the data recording area on the first recording medium. An apparatus for recording on a second recording medium, Means for recording the file name field in a directory information recording area on the second recording medium; Means for recording the data field and the additional information tag field in a data recording area on the second recording medium; and Means for recording index information to be used as a keyword when searching for the digital audio data file in the directory information recording area on the second recording medium; Recording method comprising a. An apparatus for recording digital audio data recorded on a CD in a CD audio format on a recording medium, Means for reading digital audio data recorded on the CD to extract data; Means for generating a file name and an additional information tag, Means for recording the file name and file attribute in a directory information recording area on the recording medium; Means for recording the digital audio data and the additional information tag in a data recording area on the recording medium; and Means for recording, in the directory information recording area on the recording medium, index information to be used as a keyword when searching for the digital audio data file recorded on the recording medium. Recording device comprising a. The method according to any one of claims 10 to 12, And the means for recording the index information records the index information in an area in which the file name field on the directory information recording area is recorded. The method according to any one of claims 10 to 12, The digital audio data file is a digitized music, And the index information is any one selected from the group consisting of a song name, composer, performer, and genre of the music that is the object of the digital audio data file. The method according to any one of claims 10 to 12, Means for recording the index information, And means for receiving the index information prior to recording the index information. The method according to any one of claims 10 to 12, Means for recording the index information, Means for extracting said index information from said additional information tag field prior to recording said index information. The method of claim 12, Means for compressing the digital audio data with a predetermined compression algorithm prior to recording the digital audio data and the additional information tag in the data recording area. The method of claim 12, Means for recording the index information Prior to recording the index information, Means for accessing a database of CD information over a network, Means for extracting unique information of the CD and transmitting it to the CD information database; and Means for receiving the index information from the CD information database Recording device further comprising. A computer executable program for recording a digital audio data file on a recording medium, comprising a file name field, a data field, and an additional information tag field. Recording the file name field in a directory information recording area on the recording medium; Recording the data field and the additional information tag field in a data recording area on the recording medium; and Recording index information to be used as a keyword in the directory information recording area when searching for the digital audio data file; A program for causing a computer to execute a process comprising a. The file name field included in the digital audio data file is recorded in the directory information recording area on the first recording medium, and the data field and the additional information tag field refer to the digital audio data file recorded in the data recording area on the first recording medium. A computer executable program for recording on a second recording medium, Recording the file name field in a directory information recording area on the second recording medium; Recording the data field and the additional information tag field in a data recording area on the second recording medium; and Recording index information to be used as a keyword when searching for the digital audio data file in the directory information recording area on the second recording medium; A program for causing a computer to execute a process comprising a. A computer executable program for recording digital audio data recorded on a CD in a CD audio format on a recording medium, Reading digital audio data recorded on the CD to extract data; Generating a file name and an additional information tag, Recording the file name in a directory information recording area on the recording medium; Recording the digital audio data and the additional information tag in a data recording area on the recording medium; and Recording, in the directory information recording area on the recording medium, index information to be used as a keyword when searching for the digital audio data file recorded on the recording medium. A program for causing a computer to execute a process comprising a.