KR20020005523A - Audio Player having a Caption Display Function - Google Patents

Abstract

PURPOSE: An audio player having a subtitle outputting function is provided to reproduce audio data that was not compressed and data that was compressed and, simultaneously, outputs subtitle information synchronized with the data. CONSTITUTION: An audio player having a subtitle outputting function includes a driver(22) for rotating an audio CD and a compression audio CD at a predetermined speed, an optical system(25) for obtaining an optical signal from the audio CD and compression audio CD and converting the optical signal into an analog electric signal, and a signal system for processing the output signal of the optical system as a digital signal and separating subtitle data and audio data from each other. The audio player further has a memory(44) for storing the output signal of a controller(30) that controls the operation of the driver, optical system and signal system and selecting the output signal to be stored in the memory, a decoder(50) for decoding compressed audio data output from the memory, an audio outputting unit(54) for outputting the audio data, and a subtitle outputting unit(52) for outputting the subtitle data being synchronized with the audio data.

Description

Audio player having a caption output function

The present invention relates to an audio reproducing apparatus or an audio player, and more particularly, to an audio reproducing apparatus having a subtitle output function and capable of reproducing both uncompressed audio data and compressed audio data.

Since the introduction of compact disc players as audio devices capable of playing uncompressed audio data in 1983, CD technology has been enormous in the consumer electronics and computer industries. Will be affected. In particular, CD technology makes it possible to provide various types of information with very high quality to many individuals. Most computer software programs, game and audio data, video data, and multimedia programs are supplied in the form of CDs. On the other hand, there are a number of audio file formats that compress audio data without degrading sound quality. Among them, MP3 technology is introduced, and MP3 is an electronic device that can play audio CD and MP3 data together. CD (compact disc) player (hereinafter referred to as 'MP3 CDP') has appeared.

The MP3 file used in the MP3 CDP refers to data having an MPEG (Motion Picture Expert Group) layer 3 format. Such MP3 files generally have a recording format of AAU (audio decoding unit). That is, it consists of a header, an error check code (CRC), audio data, and auxiliary data. Therefore, MP3 players that play MP3 files are typically used as audio-only devices that receive compressed audio files and play them as audio information. MP3 CDPs are usually stored on CD-ROMs. One CD-ROM stores about 150 to 170 MP3 files.

The conventional MP3 CDP developed so far provides not only the reproduction of audio data but also a function of outputting a song's singer, title, genre, and directory as text, and selecting a song based on this. In addition, a product has appeared that makes it easier and faster to select a song by using a field in file name (FIF) method. However, until now, the conventional MP3 CDP only displays simple character information and has a problem in that characters corresponding to the audio information, that is, subtitle information cannot be displayed in a state synchronized with the reproduced audio information.

An object of the present invention is to provide an audio reproducing apparatus capable of reproducing uncompressed audio data and compressed data such as MP3 data and simultaneously outputting caption information in synchronization with the data.

Another object of the present invention is to provide an audio reproducing apparatus, for example, an MP3 CDP apparatus, which has a subtitle output function in which the subtitle data is more easily synchronized with the corresponding audio data, and the synchronization failure rate is reduced.

It is still another object of the present invention to provide an audio reproducing apparatus, for example, an MP3 CDP apparatus, capable of outputting subtitle data synchronized with audio data in various formats and languages, and facilitating selection and retrieval thereof.

1 is a schematic perspective view showing the external structure of the MP3 CDP (Compact Disc Player) according to the present invention.

2 is a block circuit diagram showing the configuration of the internal circuit system of the MP3 CDP according to the present invention;

3 is a block diagram showing an information structure of a subtitle MP3 file according to the first embodiment of the present invention;

4 is a flowchart illustrating a caption data output process according to an embodiment of the present invention;

5 is a block diagram showing an information structure of a caption MP3 file according to a second embodiment of the present invention;

6 is a flowchart illustrating a caption data output process according to another embodiment of the present invention.

<Description of Major Symbols in Drawing>

10: MP3 CDP 12: main body

14: Control Panel 16: Subtitle Display

18: audio expression unit 20: CD

22: motor drive system 25: optical system

30: micro (μ) processor

32: RF amplification and waveform processing section 34: EFM demodulation section

36: frame synchronization circuit 38: PLL

40: error compensator 42: signal separation

44: memory 50: decoder

52: subtitle output unit 54: audio output unit

55: D / A converter 57: low pass filter (LPF)

An audio reproducing apparatus according to the present invention is an audio reproducing apparatus capable of reproducing both an audio CD and compressed audio data, for example, an MP3 data CD, comprising: a drive system for rotating an audio CD and an MP3 data CD at a constant speed; A signal system including an optical system which obtains an optical signal from the driven audio CD and the MP3 data CD and converts the analog electrical signal into a digital signal, and a signal separation unit which processes the output signal of the optical system into a digital signal and separates subtitle data and audio data; A memory for storing the output signal of the control system, a control system for controlling the operation of the drive system, the optical system, the signal system and selecting an output signal to be stored in the memory, a decoder for decoding MP3 data output from the memory; A subtitle output unit for outputting subtitle data separated by a signal separator; And a voice output unit configured to output audio data separated by the signal separation unit.

Compressed data used in the audio reproducing apparatus according to the present invention includes not only the MP3 format but also the AAC MP4 format, the WMA (Windows Media Audio) format, the VQF, and the A2b format. The AAC MP4 format has about 30% more compression than MP3, and the sound quality is even better when compressed with MP3. WMA is a format that compresses only music data using Microsoft's multimedia compression method. It can support data in streaming and file formats, and it can reduce data size by 1/2 with the same sound quality as MP3. The VQF file format was created by an audio compression technology called TwinVQ Transform-domain Weighted Interleave Vector Quantization (NTT) developed by Japan's NTT (Telephone), which was developed to reduce the MP3 level of sound quality to the streaming format on the Internet. Instead of directly encoding each piece of music data, this format organizes several data into a regular pattern, compares it with a standard pattern prepared in advance, selects the most similar standard pattern, and transmits the number of the standard pattern as a compressed code. On the other hand, the A2b format was developed by AT & T and can compress data without compromising sound quality and has a compression ratio of 1/20. For purposes of explanation, the following description focuses on the MP3 data format as a compressed data format. However, one of ordinary skill in the art can easily understand that it is possible to apply compressed audio data in various ways other than the MP3 format to the present invention. Modifications and variations are fully possible without departing from the scope of the present invention.

MP3 data according to the first embodiment of the present invention comprises audio information having a standard MP3 file structure consisting of a header, audio data, and auxiliary data, and subtitle information corresponding to the audio information. Location data and / or time data of the caption information is included, and when the audio information is reproduced, the caption information synchronized with the reproduced audio information is outputted using the position data and / or time data. .

The MP3 data according to the second embodiment of the present invention comprises audio information having a standard MP3 file structure consisting of a header, audio data, and auxiliary data, and subtitle information corresponding to the audio information. In the MP3 file, audio information is located before the caption information, and the caption information has caption display time data indicating a time to be displayed on the screen display device when the caption information is reproduced.

According to the present invention, when playing caption data recorded on a CD, only the caption data except audio data can be read into the memory, and the caption on the memory can be output in synchronization with the time when the audio is output on the CD. In addition, it is possible to selectively copy and store a file stored in a CD into a memory, and then reproduce and output desired data on the memory without driving the CD disk by an optical system or the like. In addition, only the subtitle data can be viewed separately by user selection for each subtitle data unit outputted at the time of playing a file in which audio and subtitles are synchronized, and audio information corresponding to the subtitle data being queried is selected by the user's selection. You can also output

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same or corresponding components in the drawings referred to in the following description, and it should be recalled that what is shown in the drawings is only an example, not an accurate scale.

1 is a schematic perspective view showing the external structure of the MP3 CDP according to the present invention.

The MP3 CDP 10 includes a main body 12, a control panel 14, a caption display unit 16, and an audio expression unit 18. The main body 12 includes internal circuit elements necessary for the operation of the MP3 CDP 10 and is equipped with an audio CD or an MP3 data CD. The control panel 14 is a user interface of the MP3 CDP 10, in which user's instructions such as playing, stopping, and selecting desired data are input. The caption display unit 16 outputs caption data in synchronization with the reproduced audio data. The caption display unit 16 is, for example, a liquid crystal display (LCD). The audio expression unit 18 is a device for outputting audio data as analog sound data, for example, headphones, earphones, or speakers.

The communication port 15 receives audio data or audio / subtitle data from an external device, for example, a computer system, and stores the data in the internal memory of the MP3 CDP.

In FIG. 1, a subtitle display unit 16 displaying subtitles is output through a liquid crystal display attached to the main body 12, that is, a structure in which the main body and the subtitle display unit are integrally formed. It is not limited. For example, it is also possible to attach a liquid crystal display to a remote controller (eg, a remote controller) that remotely controls the MP3 CDP and to allow the caption display unit 16 to be implemented on such a separate liquid crystal display.

2 is a block circuit diagram showing the configuration of the internal circuit system of the MP3 CDP according to the present invention.

The MP3 CDP can be broadly divided into a motor drive system 22, an optical system 25, a signal system, a control system, a data memory, and a caption data processing system. The motor drive system 22 may include a disc motor for rotating the audio CD or the MP3 data CD mounted on the MP3 CDP 10 at a high speed and an optical system transmitting motor for moving an optical pick-up. When the CD is loaded horizontally, a loading motor for sliding the disc tray may be added, and a motor driving servo circuit for controlling the disc motor may read a sync signal read from the CD to drive the disc in a CLV (linear speed constant method). The address signal for the tray position, the clock signal, and the like are used.

An optical pickup is located at the center of the optical system 25. The optical pickup picks up the reflected light by irradiating a laser to a designated position of the disk, for example. A focus servo to keep track of a specified distance to the reflective surface at all times, even when the disk vibrates, in order to track non-contact tracks of small pitches, e.g. 1.6 μm in size. And a servo circuit such as a tracking servo, an optical transmission servo which moves the entire optical pickup radially, and an APC (Automatic Power Control) to ensure a constant amount of laser oscillation output and laser reflection.

The signal system refers to a circuit system that receives an analog signal output from the optical pickup of the optical system 25 and processes the analog signal into a caption signal and an audio signal. The signal output from the optical pickup is a high frequency analog signal whose amplitude varies depending on the presence or absence of a pit on the CD surface. The RF amplification and waveform processing unit 32 amplifies the output signal of the optical pickup to a certain level, removes DC components and noise signals, and makes a digital signal composed of 0s and 1s through waveform equalization processing and comparator processing such as phase correction. . The digital output signal of the processor 32 is input to the EFM demodulator 34, which is recorded in 14-bit + 14-bit form, for example, to prevent the minimum unit length of the pit from becoming too short. Change the signal to 16 bits of 8 bits + 8 bits.

The frame synchronizing circuit section 36 detects a frame synchronizing signal among the digital signals and confirms the head position of each frame. When the head position is confirmed, the subcode, information bits, and error correction bits can be discriminated. Thus, information bits containing audio information can be read. The information bits are not arranged in sequence, but are arranged in a manner of being interleaved and distributed data intentionally separated from each other according to a predetermined pattern. The reason for this is to prevent an error in the reproduction data caused by scratches, dirt, pinholes or the like on the surface of the disc when the disc is reproduced so that any group of information is lost. The MP3 CDP according to the present invention also corrects the error by the error corrector 40 using this interleaving principle. The corrected data is stored in the data memory 44. The microprocessor 30 used in the audio player device according to the present invention is a kind of CPU implemented in the form of one IC chip without using a separate IC chip such as a digital signal processor (DSP).

The data stored in the memory 44 is regularly output according to the control system, that is, the system clock of the microprocessor 30 and input to the signal separator 42 (when it is audio data), or the signal separator through the decoder 50. Inputted to 42 (in the case of subtitle MP3 data or MP3 data). On the other hand, in the case of audio data, it is also possible to output it directly from the error corrector 40 to the signal separator 42 without storing it in the memory 44. That is, storage of memory 44 for audio data of a regular CD is optional.

The memory 44 according to the present invention includes a RAM device implemented in the form of a separate IC chip, a built-in memory such as a memory module, and a removable card-type memory such as a multi-media card (MMC).

On the other hand, if the disk 20 is an audio CD, this data is stored according to the CD data standard. Standards for CD technology set the logical format and structure of this data, as well as the physical layout of the data recorded on the CD. Most CD manufacturers, CD players, and disc makers use the physical arrangement standards defined in the Orange Book, Red Book (IEC 908), and Yellow Book (ISO / IEC 10149) from Sony and Philips. To comply with. The logical file structure of the industry standard is known as the ISO 9660 standard. The Yellow Book and Red Book standards have been invented primarily for writing large amounts of data (up to 650 megabytes on a 74-minute disc) onto a CD at one time. Although the Orange Book provides a physical format for increasing data records, it requires a logical file structure that can operate within these physical standards and adapt the increased data to personal computers. According to the current standard, recordable CDs are divided into a certain number of blocks (also called 'sectors'). The capacity of a disk is expressed in minutes, seconds, or sectors. For example, a 74 minute disk with 75 sectors per second has 333,000 sectors. The actual amount of user data that can be stored in one sector depends on the physical format used to write the disc. In the physical format according to the yellow book standard, each sector has 2,000 bytes of data. Therefore, the data capacity of the 74-minute disk mentioned earlier is 650 megabytes.

On the other hand, when the disc to be reproduced is an MP3 data CD, data having a format as described later is stored on the CD. When the caption MP3 data stored in the data CD is read through the optical system 25 and processed into a signal system, and finally error correction by the error corrector 40 is completed, the data is stored in the memory 44. At this time, the method of storing and reproducing subtitle information and audio information is as described in the following embodiments. Since the MP3 data is compressed data, the decoder 50 decompresses the data and decompresses it, for example, into a wave (.wav) file.

The caption mp3 data output from the decoder 50 is separated into caption data and audio data by the signal separator 42. The caption data is processed by the caption output unit 52 and finally displayed on the caption display unit 16 such as an LCD. The audio data is processed at the audio output section 54, separated into L audio signals and R audio signals, and converted into analog signals by digital-to-analog (D / A) converters 55a and 55b, respectively, and low-pass filters 57a and 57b. LPF) removes unnecessary high frequency components such as sampling frequency and outputs them to the audio representations 18a and 18b such as headphones. The caption data displayed on the caption display unit 16 is data synchronized with the audio data output to the audio expression units 18a and 18b.

It is also possible to selectively copy the MP3 data (audio or audio + subtitle) contained in the disk 20 to the internal memory 44 and output the data only through the medium-large capacity memory 44 without the operation of the optical system 25. It is possible. This allows quick access to replay and rewind of playback data, and there is no fear of data replay errors caused by external vibrations or shocks. Optional data copying is possible. On the other hand, reproduction of data through the memory 44 is also possible to input external data through the communication port 15. The communication port 15 may, for example, be connected directly to an external computer or may be connected to a remote computer via a computer network.

Next, the structure of the caption MP3 data and its reproduction process according to the present invention will be described.

First embodiment

3 is a diagram illustrating a subtitle MP3 information structure according to an embodiment of the present invention. Subtitle MP3 information according to the present invention is divided into audio information 60 and subtitle information 62. The audio information 60 is composed of a header, CRC, audio data and auxiliary data which are standard MP3 file structures. The header is located in a fixed field of 32 bits that contains information such as layer, sampling frequency, and remaining frame. CRC is optional and its presence is defined in the header. Audio data is compressed data whose length varies depending on the type of data. Auxiliary data contains additional information into user defined zones and is not constant in size.

The caption information 62 is composed of a plurality of caption information 62a, 62b, ..., 62m, and each caption information is composed of a start sync code 71, a reproduction number data 72, and an information data portion 78. have. However, this data is not necessarily arranged in the order shown in FIG. 3 is only one example for description.

The start synchronization code 71 of the caption information 62 indicates the start of the caption information. The reproduction number data 72 is located after the start sync code 71 and a number indicating which subtitle information corresponds to the audio information frame of the plurality of audio information 60 is stored. This reproduction number can be understood as the positional information of the audio information to which the subtitle information should synchronize or the positional information of the subtitle information to synchronize with the audio information. The reproduction number data 72 is a number referred to when the audio information 60 and the subtitle information 62 are reproduced, and is composed of, for example, 4 bits.

The information data unit 78 stores related information such as the address and type of data to be stored. For example, the reproduction address data 73, the information identification code 74, the selection code 75, and the subtitle data 76 are stored. Include.

The reproduction address data 73 indicates a reproduction address for allowing each subtitle information to be combined with each other when a plurality of subtitle information is a single word or an image. For example, the reproduction address data 73 is composed of 4 bits. At least one subtitle information is required to form a large paragraph according to a word or an image. The information identification code 74 indicates the file type of the stored information. The file may be, for example, an image file, a hypertext file (HTML), or a text format file to fit the screen indicator.

The selection code 75 indicates at least one of a language type of the stored information, an operation time, and a display method of the screen display unit 16 of FIGS. 1 and 2. The language type indicates, for example, a language such as Korean (KOR), Japanese (JP), English (USA), etc., and an operation time indicates a time when subtitle information should be output. This operation time data is used to synchronize the caption information with the audio information. In addition, the display method indicates whether the subtitles are output in sequence or at a time when the subtitles are output in words or sentences on the screen display unit 16, and the characters are displayed in a format (for example, 4 lines of 4 lines or 2 lines of 24 lines). Decide if you want to.

Using the operation time of this selection code 75, the subtitle information can be output in synchronization with the audio information, and this synchronization operation utilizes the operation time data of the selection unit and the reproduction number data of the reproduction number data 72 together. This data may be used separately.

The caption data 76 stores caption characters output from the MP3 data CD, or caption characters selectively copied from the CD to the memory, or caption characters input from the external system through the communication port. The caption characters stored in the caption data 76 may be caption characters stored in the memory by separating caption characters except audio data. In this case, the characters to be stored may have a format such as an image, hypertext, or text.

The caption information group 62 including the plurality of caption information 62a, 62b, ..., 62m constituted as described above is an MP3 information structure 60 composed of several pieces of audio information 60a, ..., 60n which are audio decoding units. When the audio data of MP3 is output in addition to the C), the caption data 76 corresponding thereto may be output in synchronization.

The reproduction of information having such a subtitle MP3 information structure will be described with reference to the flowchart of FIG.

When the recording medium is put into an apparatus for reproducing a signal recorded and stored on the recording medium, for example, the MP3 CDP of FIG. 1, data is started to be reproduced by a control operation of a control system including the microcomputer 30 of the reproducing apparatus (step 80 ). The data reproducing step 80 includes reproducing the data stored in the data memory inside the MP3 CDP.

If the CD to be played is an audio CD (81), the audio data stored in the audio CD is stored in the memory 44 of the MP3 CDP to determine whether to play the data on the memory or directly from the CD (step 82). Storing the audio CD data in the memory includes selective storage of the CD data.

If the CD to be reproduced is an MP3 data file (83), the data read from the signal system of the MP3 CDP is stored in the memory 44 (step 84). After reading audio data or MP3 file data stored in the memory (step 85), it is determined whether only audio information exists in the data (step 86). If only the audio information exists in the determination step 86, the audio information is output in step 87; otherwise, in step 88, it is determined whether only the subtitle information exists. If only subtitle information is found, go to step 89 to output subtitle information, and if both subtitle information and audio information exist, go to step 90 to decode the compressed audio information and prepare for playback of the audio information.

Next, as a second judging step, it is determined whether there is subtitle data corresponding to the audio data decoded in the decoding step 90 so that a subtitle corresponding to the audio is output when the MP3 CDP reproducing apparatus is output. (Step 91). If there is no corresponding subtitle information, the output of this information is maintained by continuously outputting the outputted subtitle information, or the subtitle information having blank characters is output (step 95). On the other hand, if there is caption data corresponding to the audio data, the caption data is analyzed according to the type of the file forming the caption data, for example, the file type of the image, hypertext, text, and the like (step 92).

Then, the subtitle information corresponding to the audio information decoded in the decoding step 90 is simultaneously output in synchronization with the reproduction apparatus (step 93).

In step 94, it is determined whether there is no output information, and if there is data that has not been output yet, the flow returns to step 90 along the path 96, and when it is determined that all data has been output, the playback procedure is terminated in the termination step 97.

In this manner, the MP3 CDP reproducing apparatus according to the present invention can reproduce audio data and synchronous subtitle information corresponding thereto.

Second embodiment

The caption MP3 information structure 100 according to the second embodiment of the present invention is composed of a plurality of caption MP3 files 100a, 100b, ... as shown in FIG. Each subtitle MP3 file has audio information 102 and subtitle information 104. The audio information 102 is composed of standard MPEG audio files as in the first embodiment.

In FIG. 5, subtitle information 104 is shown attached behind audio information 102. Alternatively, the caption information 104 may be placed in front of the audio information 102, but it is more preferable to use the structure shown in Fig. 5 in consideration of the generality of the software for playing the MP3 file.

In FIG. 5, one subtitle MP3 file (eg, 100a) is composed of one audio information 102a and one subtitle information 104a. However, this is for the sake of simplicity of drawing, and the fact that most actual subtitle MP3 files consist of a plurality of audio information and corresponding plurality of subtitle information is one of ordinary skill in the art to which the present invention pertains. It will be easy to understand. One subtitle MP3 file corresponds to, for example, a song and a piece of speech information divided by a predetermined standard (for example, a topic).

The caption information 1 104a and the caption information 2 104b are respectively divided into caption start synchronization signals 106, caption data 1, 2,... , N (108a, 108b, ..., 108n), the text type 110, and the caption confirmation code 112. The subtitle start synchronization signal 106 indicates, for example, the start position where the subtitle information is contained as 4 byte data. The caption data 108 has character information to be displayed on the actual screen, and the size thereof changes depending on the character information. The caption data 108 will be described later.

The text type 110 determines the output type, ie form, of the subtitle text, for example, so that the character information in the subtitle data 108 is output in four 20 lines or two 24 lines. The caption confirmation code 112 is a code for confirming whether the information structure is a caption MP3 file. Subtitle data 1, 2,... , N (108a, 108b, ..., 108n) respectively indicate the subtitle display time 114, the sentence start confirmation 116, the subtitle section 118, the additional data 120, the option 122, and the data size 124. It has a structure to include.

The subtitle display time 114 is, for example, 7 bytes in size as time data at the time when the subtitle is displayed. The sentence start confirmation 116 is a code for finding the beginning of a sentence when a sentence is displayed on several screens. The caption unit 118 corresponds to character data to be displayed on the screen, and the additional data 120 is used when information other than an option is required, and the file type (image file, highlighter file, text file) of caption information is used. Contains information indicating or indicating the language of the subtitle information. Option 122 may be scrolled (e.g., scrolled through a character to be displayed, or the next sentence gradually appears in a position where the previous sentence gradually disappears and then disappears), flash (e.g., blinking of characters), or the like. It is a storage place for so-called optional options for storing information. The data size 124 contains information about the length of the caption data.

In the caption MP3 file having such an information structure, the audio information and the caption information are synchronized by the caption display time 114 data. Synchronization using time information is more advantageous than synchronization using location information and has a lower synchronization failure rate.

On the other hand, as described above, the standard MP3 file has a format consisting of a header, an error check, audio data, and additional data. It is conceivable to include subtitle information in the additional data of the standard MP3 file. However, since the compression rate varies depending on the amount of audio data, it is more convenient to add subtitle information in a separate file structure as in the first or second embodiment of the present invention, rather than inserting the subtitle information in the additional data. There are many advantages, such as easier and noise prevention due to mutual interference of subtitle information and audio information.

6 is a flowchart illustrating a method of playing caption information in a caption MP3 file according to the second embodiment of the present invention.

Use the subtitle confirmation code of the subtitle information to check whether the file to be played contains subtitle information. If the subtitle information is not present, only the audio information is played. If the subtitle information is included in the file, save the subtitle information to the MP3 CDP's memory. Then, playback of the caption information is started (step 130). When playback of the file starts, subtitle information is initialized (step 132). In the caption information initialization step 132, it is determined whether the caption already displayed on the screen display device is deleted or which file the caption information is attached to. While the subtitle MP3 file is being played back, it is determined whether or not playback is to end (step 134). When the playback ends, the playback ends in the final ending step 140, otherwise the subtitle time value is taken (step 135). Then, the play time being played in units of 1/1000 second is obtained (step 136). This play time is a value counted by the microprocessor 30 of the playback apparatus, for example, the MP3 CDP. This play time is compared with the subtitle time (step 138). The caption time is the caption display time 114 of the caption data 108 and is a time data value at the time when the caption is displayed. The subtitle time is compared with the play time (step 138) and if the two values match, the subtitle is output (step 139), and if it does not match, the next subtitle time data is taken (path 137). After the predetermined amount of subtitles have been output, the process returns to the playback end determination step 134 again (path 141), and steps 134 to 139 are repeated.

According to the present invention, it is possible to implement an MP3 CDP device in which the subtitle information is output in synchronization with the audio information corresponding thereto.

Further, according to the present invention, the caption can be synchronously outputted using the operation time data and the reproduction number data of the caption MP3 data simultaneously or separately, or the caption data can be synchronously outputted using the caption display time data. This allows for simpler synchronous subtitle output and lowers synchronization failure rates.

In addition, since the audio and subtitles are synchronized using a data format including a reproduction address portion in which the reproduction number data is stored, the subtitles at a constant speed without additional operation or special technical considerations according to the output speed (ie, speed or tempo) of the audio signal. It is possible to output In other words, if you change the speed of the audio signal quickly or slowly, and you do not need additional circuitry to synchronize the subtitle data with it, you can simplify the configuration of the player and play back language data as well as music data. This is especially useful when This is because it is possible to adjust the playback speed of music or language data according to the user's ability or taste, but can simply output synchronous subtitles or lyrics without additional circuitry or design change.

Further, according to the present invention, since the standard MP3 data audio information is stored and output separately from the caption information in the caption MP3 information structure, only the caption data can be output separately. In other words, you can see only the lyrics data separately from listening to the song, and you can maximize the language learning efficiency because it can be output by repeating the sentences separately from the language listening, or by searching for desired parts.

In addition, since the MP3 CDP according to the present invention outputs a caption signal in accordance with the display method data, it is possible to output the caption in various ways, and since it contains language type data indicating the language type of the caption, one voice or audio Subtitle data of various languages can be output in a suitable language according to a user's selection. In addition, since the data indicating the type of the subtitle file is included in the information structure and the subtitle signal is output according to the file type data, the subtitle data is output not only in the form of text but also in the form of an image or in a hypertext document. It is possible to search for a specific part of the subtitles, and it is possible to output the subtitles in a form with much better visual effects.

Since the data contained in the CD according to the present invention can be sorted and stored in a memory, the data can be played back only in the memory without using a CD disk. Therefore, only a large number of data contained in the C can be easily played back. Since playback is possible, it is possible to completely eliminate playback defects caused by player vibration or shock. In addition, when playing the caption information recorded on the CD, only the subtitle editor except the voice is read into the memory and the subtitles in the memory are output in synchronization with the time when the audio is output on the CD. I can eliminate it.

Claims (11)

An audio playback device that can play both audio CDs and uncompressed audio data. A drive system that rotates the audio CD and the compressed audio CD at a constant speed, An optical system which obtains an optical signal from an audio CD and a compressed audio CD driven by the drive system and replaces the analog electrical signal with the optical system; A signal system including a signal separator configured to process the output signal of the optical system as a digital signal and to separate subtitle data and audio data; A memory for storing an output signal of the control system; A control system for controlling the operation of the drive system, the optical system, and the signal system and selecting an output signal to be stored in the memory; A decoder for decoding the compressed audio data output from the memory; An audio output unit for outputting audio data separated by the signal separation unit; And a caption output unit configured to output caption data separated by the signal separation unit in synchronization with audio data output to the audio output unit. In claim 1, The compressed audio data has an MP3 file format, and the MP3 file has subtitle MP3 information including audio information having a standard MP3 file structure consisting of a header, audio data, and auxiliary data, and subtitle information corresponding to the audio information. As a structure, The subtitle information includes position data and / or time data of the subtitle information, and is configured to output subtitle information synchronized with the reproduced audio information when the audio information is reproduced using the position data and / or time data. An audio reproducing apparatus, characterized in that. In claim 2, The subtitle information includes a start portion indicating the start of the subtitle information and an information portion, wherein the position data is a reproduction number portion indicating the number of frames of audio information to be reproduced and the subtitle information, and the reproduction number portion is included in the information portion. And an audio playback device. In claim 3, The information unit, A reproduction address section indicating a reproduction address for combining each subtitle information when a plurality of subtitle information is a word or an image; An information identifier indicating a file type of stored information; A selection unit for indicating at least one of a language type, an operation time, or a screen display method of stored information; And a caption unit in which caption characters are stored. In claim 1, Each subtitle MP3 file includes audio information having a standard MP3 file structure including a header, audio data, and auxiliary data, and subtitle information corresponding to the audio information. Audio information in each of the subtitle MP3 files is located before the subtitle information, and the subtitle information has subtitle display time data indicating a time displayed on the screen display when the subtitle information is reproduced. In claim 5, The subtitle information, A caption start synchronization signal indicating a start position of the caption information; A plurality of subtitle data having character information to be displayed on the screen display device; A text type for determining an output form of the character information; Include a caption verification code. And the caption display time data is included in each of the plurality of caption data, and is compared with a play time counted when the caption MP3 file is played. In claim 6, Each of the caption data, Sentence start confirmation data indicating a beginning of a character consisting of the subtitle data; A caption section comprising character data to be displayed on the screen display data; Additional data containing scroll type and flash information, And a data size containing length information of the caption data. The method of claim 1, wherein the audio CD contains caption data, and the memory stores only the caption data recorded on the audio CD so that the caption data is output in synchronization with the time of the audio data output from the audio CD. Audio playback device. 2. The audio reproducing apparatus according to claim 1, wherein the memory stores data stored in an audio CD and the stored data is directly output from the memory without driving the audio CD. The method of claim 1, wherein when the caption data and the audio data are output, the caption data is selectively searched for each unit of the caption data output, and only the audio data corresponding to the caption data is selectively output. Audio playback device. The audio reproducing apparatus of claim 1, wherein the subtitle output unit has a separate structure physically separated from a main body constituting the audio reproducing apparatus.