KR100373812B1 - System and method for reproducing audio and caption data and portable digital audio player with a caption function - Google Patents

Abstract

The present invention provides a voice subtitle reproducing system and method and a subtitle display function capable of encrypting a voice subtitle file using a unique number assigned to each portable digital audio player and decrypting and reproducing the encrypted voice subtitle file only through the unique number. Provides a portable digital audio player equipped. Subtitle data is generated by converting languages, characters, graphics, and the like into image data. As a result, the portable digital audio player can display various languages irrespective of the preset character font. Further, the encryption of the voice caption file is performed for each language learning textbook, section, sentence, or display screen unit based on the unique number of the input portable digital audio player. The encrypted voice subtitle file includes a multi-bit cipher recognition code generated based on the unique code of the portable digital audio player. The portable digital audio player can reproduce an encrypted voice caption file by a combination of a password recognition code and its own unique number, thereby preventing illegal copying of the copyrighted voice caption file.

Description

SYSTEM AND METHOD FOR REPRODUCING AUDIO AND CAPTION DATA AND PORTABLE DIGITAL AUDIO PLAYER WITH A CAPTION FUNCTION}

The present invention relates to a portable digital audio player, and more particularly, to a portable digital audio player having a caption function for language learning.

Recently, due to the development of data compression technology, an MP3 player has been widely used and used as an audio player using a computer. The MP3 file input to the MP3 player is a kind of computer music file for recording audio data. The MP3 file is a compressed file that allows music files to be downloaded and listened to via the Internet without a sound recording device such as a recorder.

In detail, as shown in FIG. 1, when a user wants to listen to desired music provided on the Internet through the personal computer 20, the user can access various audio web sites on the Internet through the web browser of the personal computer 20. Is connected to one of the sites, for example, the audio web site 40, and requests to download necessary music files. Accordingly, the web application 40b of the audio web site 40 retrieves the music file requested by the user from the database 40c and transmits the music file to the personal computer 20 through the web server 40a. The music file downloaded from the audio web site 40 is stored in the hard disk of the personal computer 20, and listened to by the acoustic device provided in the personal computer 20 or the personal computer 20 according to the needs of the user. The MP3 player 11 can be downloaded to the MP3 player 11 connected to the cable and listen to the desired music through the audio device of the MP3 player 11.

Hereinafter, a music file reproduction process in the conventional MP3 player 11 will be described with reference to FIG. The main components of the conventional MP3 player 11 include a memory 2, a decoder 5, a voice signal processor 7 and a text converter 8, as shown in FIG.

The MP3 player 11 downloads the MP3 music file stored in the hard disk of the personal computer 20 and stores it in the memory 2 through the input unit 1 connected to the personal computer 20 by cable connection. Typically, MP3 music files contain text data in ASCII codes representing the name of a song, a singer's name, and the like. When the user wants to listen to the desired music from the downloaded music files, the user selects the corresponding music file displayed on the LCD panel 10 through the control unit 3, and the controller 4 controls the corresponding music file from the memory 2. The music file is taken out and controlled to be transmitted to the decoder 5. The decoder 5 decompresses a compressed MP3 music file through a conventional decoding method, converts the converted MP3 music file into original digital audio data, and transmits the same to the signal separation unit 6. The signal separator 6 separates the voice signal and the text data from the input digital audio data, transmits the voice signal to the voice signal processor 7, and transmits the text data to the text converter 8.

The audio signal processing unit 7 converts and amplifies the input digital audio signal into an analog electric signal, and then outputs it to the headphones 9, for example. Meanwhile, the text converter 8 converts the font into the font corresponding to the input text data and transmits the converted font to the LCD panel 10. The LCD panel 10 displays information such as, for example, a song name, a singer's name, a reproduction, a track, a time, and the like provided from the text conversion unit 8 in synchronization with an audio signal. In this way, the user can download the music he / she wants from the Internet and listen as needed.

However, such a conventional MP3 player 11 is used exclusively for music, and the character processing is in the ASCII code system, so that not only the disadvantage of having to separately provide a character font in order to convert these codes, but also corresponds to a preset font. Only the characters can be displayed, but other types of characters cannot be displayed.

In addition, the subtitle display is not possible with the structure of the conventional MP3 player 11, and even if the subtitle display is possible, the data from the audio web site to the personal computer when the MP3 sentence file has a large capacity such as a long caption. Since the transmission speed will be slow, the conventional MP3 player has a drawback that it is not suitable for language learning using subtitles. In addition, the conventional MP3 player 11 has no disadvantage in that a special data security device is provided so that unauthorized copying or downloading of music files having copyrights stored in the hard disk of the personal computer 20 can be used without permission.

Accordingly, it is an object of the present invention to provide a portable digital audio subtitle file by generating a subtitle file encrypted by generating a subtitle as image data and encrypting the voice subtitle file including the subtitle using a unique number assigned to each portable digital audio player. An object of the present invention is to provide an audio subtitle reproducing system and method capable of decrypting and reproducing an encrypted voice subtitle file only through a unique number of a player.

Another object of the present invention is to provide an improved portable digital audio player having a caption function capable of displaying multilingual characters in addition to the character font set in the portable digital audio player.

It is still another object of the present invention to provide an improved portable digital audio player having a caption function capable of preventing illegal copying of a voice caption file by using a unique number assigned to each portable digital audio player.

1 is a schematic diagram showing a web architecture using a conventional portable digital audio player.

2 is a schematic block diagram of a conventional portable digital audio player.

3 is a schematic diagram showing a web architecture using the portable digital audio player of the present invention.

4 is a block diagram illustrating an audio web site for generating and providing a voice subtitle file in accordance with the present invention.

5 is a schematic diagram for explaining an image data generation process;

6 is a diagram illustrating a data configuration of an audio subtitle file output from a data encryption and compression unit of the present invention.

7 is a schematic block diagram of a portable digital audio player according to a first embodiment of the present invention.

8 is a schematic block diagram of a portable digital audio player according to a second embodiment of the present invention.

9 is a flowchart for explaining a process of downloading an audio subtitle file from an audio web site to a personal computer.

10 is a flowchart illustrating a process of downloading a voice subtitle file stored in a hard disk of a personal computer to a portable digital audio player.

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

4: control unit

5: decoder

6: signal separation unit

7: voice signal processing unit

42: image data generation unit

45: data synthesis unit

46: ID verification unit

47: data encryption and compression

400a: web server

400b: Web Application

400c: database

800: caption processing unit

800a: detection unit

800b: text converter

800c: subtitle playback unit

In order to achieve the above object, according to the present invention, in a voice subtitle reproducing system having an audio web site and a portable digital audio player, reproducing a voice subtitle file provided from an Internet system,

The audio web site includes: first data generating means for generating information consisting of a plurality of characters each converted into image data as subtitle data of the audio subtitle file; Second data generating means for converting and amplifying an input voice signal and outputting the voice signal as voice data of the voice subtitle file; Encrypting means for receiving a unique code, performing a validity judgment of the received unique code, and then encrypting the caption data to provide encrypted caption data; Compression means for compressing the voice data and the encrypted subtitle data and outputting the voice subtitle file,

The portable digital audio player includes: decoding means for receiving and decompressing the voice caption file to extract the voice data and to decrypt the encrypted caption data based on the unique code; An audio subtitle reproducing system is provided that includes reproducing means for reproducing the audio data and the subtitle data, respectively.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. In addition, the corresponding part in each figure is demonstrated using the corresponding code | symbol.

3 is a diagram illustrating a web architecture using an improved portable digital audio player with a subtitle function according to a preferred embodiment of the present invention, except for the description of the subtitle function and the encryption function described below. Note the same thing as in 1. 4 is a block diagram illustrating an audio web site 400 for generating and providing a voice caption file according to a preferred embodiment of the present invention.

In Figures 3 and 4, the audio web site 400 includes a web server 400a, a web application 400b, and a database 400c, as noted. As shown in FIG. 4, the web application 400b converts a character input by a character input unit 41 such as a keyboard into image data, and outputs an image data generation unit 42 and a voice input unit 43 such as a microphone. And a voice signal processor 44 for amplifying, converting and outputting a voice signal input by the N-S, and a data synthesizer 45 for synthesizing the image data and the converted voice data and storing the synthesized voice data in the database 400c.

In detail, as shown in FIG. 5, when generating an image data (ie, a caption) called “GOOD MORNING” displayed in English language teaching material, for example, the image data generator 42 A series of characters "G", "O", ... is used by using a pixel block 50 composed of NxM (e.g., 16x12) pixels. , Image data corresponding to "G" are sequentially generated. Similarly, in the case of generating image data related to Japanese, Chinese characters or pictures, the corresponding character can be generated using the basic pixels as described above. The subtitles of the language learning textbook generated by the image data generating method as described above and the voice data converted by the voice signal processor 44 are synthesized by the data synthesizing unit 45 to form a single voice subtitle file in the database 400c. Are kept in. In Fig. 5, reference numeral 70 denotes a function desired by the user among the conventional MP3 player function " MP3 ", the function " Cap.No " for displaying the serial number of the sentence so that the desired sentence can be searched. A selection button area provided for selecting. The select button area 70 may further be provided with a tape playback function or a radio listening function.

In addition, the web application 400b includes an identification confirmation unit 46 and a data encryption and compression unit 47. The ID verification unit 46 checks the user's identity when the user connects to the audio web site 400 via the Internet 30 and executes a login. The data input at the time of login is purchased by the user. A serial number uniquely assigned to a portable digital audio player. The data encryption and compression unit 47 encrypts only the subtitle data in the voice subtitle file extracted from the database 400c based on the unique number input by the user, and then compresses and encrypts the encrypted voice caption using a normal data compression method. Print the file. According to the present invention, the web application 400b can encrypt the synthesized speech subtitle file drawn out from the database 400c based on the unique number.

FIG. 6 is a diagram illustrating a data structure of an audio subtitle file 80 output from the data encryption and compression unit 47 of the present invention. In the figure, the most significant two bits represent a cipher recognition code generated based on the corresponding unique number used at the time of encryption in the data encryption and compression unit 47, and the next two bits represent the LCD panel of FIG. 60 is a sequence code indicating a serial number of a sentence to be displayed on the fifth, and the fifth to sixteenth bits indicate caption data corresponding to characters, pictures, and the like to be displayed on the LCD panel 60. The password recognition code may be allocated for each unit learning textbook, for each unit of the unit learning textbook, for each sentence, or for each screen unit to be displayed once on the LCD panel. Similar to the allocation unit of the encryption recognition code, the data compression unit performed by the data encryption and compression unit 47 of the present invention may be displayed once per unit learning textbook, for each unit of the unit learning textbook, for each sentence, or once on the LCD panel. It can be compressed for each screen unit.

7 is a schematic block diagram of a portable digital audio player 110 having a subtitle function according to a preferred embodiment of the present invention, which is implemented to use the functions provided by the aforementioned website 40 over the Internet.

As shown in FIG. 7, except for the character processing unit 800 of the present invention, the input unit 1, the memory 2, the operation unit 3, the control unit 4, the decoder 5, and the signal separation unit ( 6) and the voice signal processing section 7 are the same as those of the related art components shown in FIG. Therefore, the description of the conventional components are omitted, and hereinafter, only the character processing unit 800 according to the preferred embodiment of the present invention will be described in detail.

The portable digital audio player 110 of the present invention receives a digital voice caption file provided through the personal computer 20 from the audio web site 400, and can reproduce caption data represented by multilingual characters in addition to the general music listening function. It is also useful as a language learning device.

In the portable digital audio player 110 of the present invention, the audio data is reproduced by the audio signal processing unit 7 and the audio device 9 as described above, and the text or subtitle data is detected by the detection unit of the character processing unit 800 ( 800a), the text processing unit 800b and the LCD panel 10 constituted by the text converting unit 800b and the subtitle reproducing unit 800c.

In detail, the detection unit 800a of the caption processing unit 800 determines whether the character data of the music file provided from the audio web site 400 is general text data or caption data based on the password recognition code shown in FIG. 6. do. Here, the text data represents simple file information such as a song name and a singer name as described above.

If the input character data is text data, the detection unit 800a supplies the text data to the text conversion unit 800b which performs the same function as the text conversion unit 8 of FIG. 2 to reproduce the font corresponding to the text data. To be displayed on the LCD panel 10. On the other hand, if the input text data is caption data, the detection unit 800a supplies the caption data to the caption reproduction unit 800c.

The caption player 800c decodes the encrypted caption data by combining a password recognition code in the input caption data with a unique number of the portable digital audio player 110 using logic for preset decryption. As shown in the figure, a caption "GOOD MORNING" is displayed on the LCD panel 60.

If the encryption identification code of the encrypted subtitle data provided from the audio web site 400 and its own number do not match, the portable digital audio player 110 cannot reproduce the received subtitle data. That is, the portable digital audio player 110 does not have the authority to use the subtitle data for language study provided from the audio web site 400, thereby making unauthorized audio subtitle files registered in the audio web site 400 unauthorized. You cannot use it.

According to a second preferred embodiment of the present invention, the portable digital audio player 110 'shown in FIG. 8 includes a decoder 5' and a subtitle playback unit 800 '. The decoder 5 'decompresses the audio subtitle file provided from the audio web site 400 through the personal computer 20, and then, like the first embodiment described above, assigns the unique number of the portable digital audio player 110 to it. Decrypts the encrypted voice subtitle file on the basis of The decoded voice data and subtitle data are separated by the signal separating unit 6 and reproduced by the voice signal processing unit 7 and the subtitle reproducing unit 800 ', respectively.

According to the second embodiment of the present invention, the user inputs a unique number of his portable digital audio player upon connection to the audio website 400, and the audio website 400 generates a voice based on the entered unique number. Since the subtitle file is encrypted and provided, the user can play the voice subtitle file only through the portable digital audio player to which the corresponding unique number is assigned. Thus, illegal copying of copyrighted voice caption information is prevented.

Hereinafter, the user registration process to the audio web site 400 will be described briefly.

First, the user accesses the audio web site 400 using his computer in the usual way, selects the user registration menu provided by the web site 400, and then uniquely identifies the product purchased with his personal information. Enter a number. The audio web site 400 determines whether the unique number of the input product exists within the preset product number. If the input information is valid, the audio website 400 stores the user's personal information and the unique number in the database 400c and confirms the registration. Send to.

9 is a flowchart for explaining a process of downloading an audio subtitle file from the audio web site 400 to the personal computer 20. As shown in FIG.

First, the user connects to the audio web site 400 through the web browser of the personal computer 20 (step S81), and then inputs the unique number of the product he purchased (step S82). The audio web site 400 determines whether the inputted unique number is a registered valid number (step S83); If it is valid, file indexes such as language learning materials or music records are transferred to the personal computer 20 (step S84); If it is not valid, the flow returns to step S82 to request to re-enter the unique number of the product.

In the next step S85, the user determines whether the desired file exists from the file index provided from the audio web site 400 to the personal computer 20. If there is no desired file, the file is searched for in step S86. If there is a desired file, the file is designated in step S87 and a download request is made to the audio web site 400 side. In response to the file download request, the web application 400b fetches the designated file from the database 400c in step S88. Thereafter, the web application 400b encrypts the extracted file using the unique number input at the time of login and compresses the file in a normal manner (step S89), and the personal computer 20 through the web server 400a. To the side (step S90). Next, the personal computer 20 receives the file requested for download in step S91 and stores it in the hard disk.

10 is a flowchart illustrating a process of downloading a voice caption file stored in a hard disk of the personal computer 20 to the portable digital audio player 110.

In step S91, the portable digital audio player 110 is connected to the personal computer 20 via a cable to download a desired voice caption file stored in the hard disk of the personal computer 20 and store it in the memory 2. If a request for reproduction of the desired voice caption file is requested through the operation unit of the portable digital audio player 110 in step S92, the desired voice caption file is decoded by the decoder 5 in step S93. In step S94, the voice signal and the text signal of the decoded voice caption file are separated by the signal separator 6. The audio signal is converted and amplified into an analog electric signal in step S95 and reproduced through the acoustic device, and the text signal is discriminated in step S96 as normal text data or subtitle data based on the unique number of the product.

If the text signal is normal text data in step S96, the portable digital audio player 110 reproduces the font corresponding to the text data (step S97) and displays it on the LCD panel 10 (step ( S98)). On the other hand, if the text signal is caption data, the portable digital audio player 110 decrypts the encryption code included in the caption data and the unique number of the product in step S99. In step S100, actual subtitle data to be displayed on the LCD panel 10 is extracted from the decrypted data and displayed on the LCD panel 10 (step S101).

As mentioned above, although preferred embodiment of this invention was described, those skilled in the art can change variously, without deviating from the claim of this invention.

Accordingly, according to the present invention, by converting and providing subtitles such as long texts into image data, multi-language characters can be displayed in addition to the character font set in the existing audio player, so that a music listening function and a language learning function can be simultaneously provided. have.

Further, according to the present invention, since encryption is performed using a unique number assigned to each audio player, it is possible to prevent illegal duplication of a voice subtitle file using another audio player.

In addition, according to the present invention, it is possible to provide long caption data without increasing the memory capacity of the audio player through data compression, which is cost effective.

Claims (22)

An audio subtitle reproducing system having an audio web site and a portable digital audio player, for reproducing a voice subtitle file provided from an Internet system. The audio website, First data generating means for generating, as caption data of said voice caption file, information consisting of a plurality of characters each converted into image data; Second data generating means for converting and amplifying an input speech signal and outputting the speech signal as speech data of the speech caption file; Encryption means for receiving a unique code and performing validity determination of the received unique code, then encrypting the caption data to provide encrypted caption data; Compression means for compressing the voice data and the encrypted subtitle data and outputting the voice subtitle file, The portable digital audio player, Decoding means for receiving and decompressing the voice caption file to extract the voice data and to decrypt the encrypted caption data based on the unique code; Reproducing means for reproducing the audio data and the subtitle data, respectively Voice subtitle playback system comprising a. The method of claim 1, And the image data is sequentially generated using N × M pixels. The method of claim 2, And N and M are 16 and 12, respectively. The method of claim 2, And the image data is at least one of languages, symbols, and graphics of each country. The method of claim 1, The unique code is a product serial number assigned to the portable digital audio player. The method of claim 1, The encryption means is a voice subtitle reproduction system for encrypting by language learning textbooks, units, sentences, or display unit. The method of claim 5, And the encrypted caption data comprises a plurality of bits of a password recognition code generated based on the unique code of the portable digital audio player. The method of claim 7, wherein And said decoding means further comprises means for determining said subtitle data as a text code if said encryption recognition code does not exist in said encrypted subtitle data. The method of claim 8, And the text code indicates file information such as song name, singer name, play time, track, and the like. The method according to claim 8 or 9, The regeneration means A voice signal processor for converting, amplifying and reproducing the voice data; A caption reproducing unit for reproducing the font corresponding to the caption data or the text code Voice subtitle playback system comprising a. The method of claim 1, And the reproducing means has a function of retrieving and viewing a desired sentence from the subtitle data using the serial number of the sentence. The method of claim 1, And the caption data and the caption data are synchronized with each other. An audio subtitle reproducing system having an audio web site and a portable digital audio player, for reproducing a voice subtitle file provided from an Internet system. The audio website, First data generating means for generating, as caption data of said voice caption file, information consisting of a plurality of characters each converted into image data; Second data generating means for converting and amplifying an input speech signal and outputting the speech signal as speech data of the speech caption file; Encrypting means for receiving the unique code and performing validity determination of the received unique code, then encrypting the voice data and the subtitle data to provide encrypted voice subtitle data; Compression means for compressing the encrypted voice caption data and outputting the voice caption file; The portable digital audio player, Decoding means for receiving and decompressing the voice caption file, and extracting the voice data and the caption data by decoding the encrypted voice caption data based on the unique code; Reproducing means for reproducing the audio data and the subtitle data, respectively Voice subtitle playback system comprising a. The method of claim 13, The unique code is a product serial number assigned to the portable digital audio player. The method of claim 13, And the encryption by the encryption means is performed for each language textbook, section, sentence, or display screen unit. The method of claim 13, And the encrypted voice caption data comprises a plurality of bits of a password recognition code generated based on the unique code of the portable digital audio player. The method of claim 13, And the caption data and the caption data are synchronized with each other. In a digital audio player for playing an encrypted voice subtitle file provided from an internet audio web site, Means for receiving the encrypted voice caption file; Means for decrypting the encrypted voice subtitle file based on a unique code assigned to the digital audio player; Means for separating speech data and caption data contained in the decoded speech caption file; Means for generating a speech signal corresponding to the separated speech data; Means for generating a character font corresponding to the separated subtitle data Digital audio player comprising a. The method of claim 18, And the voice signal and the text font are synchronized with each other and output. A method of playing a voice subtitle file provided from the audio web site in an audio subtitle reproducing system having an internet audio web site and a digital audio player, the method comprising: A first step in which a user accesses the audio web site using a computer, A second step of the user inputting a unique number assigned to the audio player; Determining a validity of the inputted unique number and optionally transmitting a file index indicating file information to the computer or requesting the user to re-enter the unique number according to the result; Selecting a desired file from the file index and requesting a download from the audio web site; In response to the download request, retrieving the desired voice caption file from a database coupled to the audio web site, encrypting and compressing based on the unique number, and providing the same to the computer; A sixth step of receiving the voice subtitle file provided from the audio web site and storing it in a memory of the computer; A seventh step of downloading the voice caption file stored in the memory of the computer to a storage device of the portable digital audio player and requesting playback; An eighth step of extracting the voice data and the subtitle data of the voice subtitle file by decompressing and decrypting the voice subtitle file using a unique code of the portable digital audio player in response to the reproduction request; 9th step of reproducing said audio data and said subtitle data Voice subtitle playback method comprising a. The method of claim 20, The fifth step is The encryption is performed only on the caption data of the voice caption file fetched from the database, The eighth step And decompressing the subtitle file using the unique code of the portable digital audio player. The method of claim 20, And the caption data and the caption data are synchronized with each other.