WO2003009154A1 - Mobile multimedia terminal and method for controlling same - Google Patents

Mobile multimedia terminal and method for controlling same Download PDF

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Publication number
WO2003009154A1
WO2003009154A1 PCT/KR2002/001319 KR0201319W WO03009154A1 WO 2003009154 A1 WO2003009154 A1 WO 2003009154A1 KR 0201319 W KR0201319 W KR 0201319W WO 03009154 A1 WO03009154 A1 WO 03009154A1
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WO
WIPO (PCT)
Prior art keywords
multimedia
data
mobile
identification number
stored
Prior art date
Application number
PCT/KR2002/001319
Other languages
French (fr)
Inventor
Jonathan D. Mu
Kwang Kyun Chung
Original Assignee
Heartmorenet Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heartmorenet Co., Ltd. filed Critical Heartmorenet Co., Ltd.
Publication of WO2003009154A1 publication Critical patent/WO2003009154A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/44—Program or device authentication
    • G06F21/445—Program or device authentication by mutual authentication, e.g. between devices or programs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0876—Network architectures or network communication protocols for network security for authentication of entities based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2111—Location-sensitive, e.g. geographical location, GPS

Definitions

  • the present invention relates generally to a mobile multimedia terminal and method of controlling same; and, more particularly, to a mobile multimedia terminal and a method for controlling same, which has functions of compactly storing and playing multimedia data and performing a user authentication for software and hardware.
  • PDA-level terminals are most suitable for such mobile multimedia terminals in terms of the ratio of price to performance, portability and the convenience of its user interface.
  • PDAs Moving Pictures Expert Group-1 Audio Layer-3
  • a mobile multimedia terminal having such a variety of functions is disclosed in Korean Patent Laid-Open Publication No. 2000-032949 (hereinafter, referred to as "prior art 1") .
  • a conventional mobile multimedia terminal is comprised of parts described below.
  • the conventional mobile multimedia terminal includes a Central Processing Unit (CPU) adapted to control data transmission/reception to/from external devices, a user interface, a memory operation and multimedia data input/output; a function key input means for controlling the selection of function keys; an audio input/output means for controlling the input and output of audio data; a display means for displaying information; a data storage means comprised of a Read-Only Memory (ROM) , a Random Access Memory (RAM) and a flash RAM and designed to store various data and programs; and a data transmission/reception means for transmitting/receiving data to/from an external device.
  • CPU Central Processing Unit
  • a conventional mobile multimedia terminal includes a storage means for storing multimedia data.
  • the storage means has a basic capacity of 8MB to 32MB, and is extendable.
  • the storage means basically provided in the conventional mobile multimedia terminal has a limitation in storing multimedia data. Accordingly, an additional memory extension pack must be purchased so as to store a large amount of multimedia data, so there are caused an inconvenience and a cost increase. As a result, there are needed a method and an apparatus for efficiently storing a large amount of multimedia data without increasing costs.
  • the author of multimedia contents possesses his own use authorization key and encodes the multimedia contents using the use authorization key, while a user of the multimedia contents acquires the use authorization key through a licensing process and decodes/utilizes the encoded multimedia contents using the use authorization key.
  • multimedia data are encoded using an additional IDentification (ID) and the encoded multimedia data are decoded using the ID, so the illegal reproduction of multimedia data can be prevented.
  • ID IDentification
  • the prior arts 2 and 3 provide means for preventing an illegal reproduction of multimedia contents.
  • the prior arts 2 and 3 are disadvantageous in that they do not provide means for preventing an illegal reproduction of hardware.
  • the use authorization keys or the IDs used in encoding can be easily copied.
  • a primary object of the present invention to provide a mobile multimedia terminal and a method for controlling same, which is capable of storing and managing a large amount of multimedia data without redundancy by classifying multimedia data stored in the mobile multimedia terminal into various types, examining the redundancy of each type of multimedia data and storing only one of redundant multimedia data if the redundancy of multimedia data is present.
  • Another object of the present invention is to provide a mobile multimedia terminal and a method for controlling same, which includes a user authentication means, wherein a user authentication can be carried out by using an encoded unique hardware number included in the user authentication means, thereby preventing software and hardware from being illegally copied.
  • a mobile multimedia terminal for storing and playing multimedia data, comprising: a data transmission/reception means for controlling transmission/reception of multimedia data to/from an external device; a storage means including a first storage unit for storing multimedia data to be played and a second storage unit for temporarily storing multimedia data received from the external device through the data transmission/reception means; a control means for storing multimedia data of the second storage unit not identical with the multimedia data of the first storage unit in the first storage unit by performing a redundancy test in which lengths and error detection codes of the multimedia data of the first and second storage units are compared with each other, respectively; an audio input/output means for controlling input/output of audio data; a function key input means for directing a selection of multimedia data and an execution of a multimedia data playing program; and a display means for showing results of playing of multimedia data.
  • a method for authenticating a hardware user of a mobile multimedia terminal having a user authentication means comprising the steps of: inputting an encoded hardware identification number and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number with the decoded hardware identification number; and stopping an operation of the mobile multimedia terminal if the decoded result coincides with the decoded hardware identification number.
  • a method for authenticating a software user of a mobile multimedia terminal having a user authentication means comprising the steps of: inputting an encoded hardware identification number received from an external device and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number received from an external device with the decoded hardware identification number; and stopping a reception of data and/or a program from the external device if the decoded result coincides with the decoded hardware identification number.
  • a method for storing multimedia data including a multimedia script file and a multimedia database in a mobile multimedia terminal ' comprising the steps of: transmitting a multimedia table included in a multimedia script file stored in an external device to the mobile multimedia terminal; testing for a redundancy of the multimedia database by comparing information on multimedia data included in the multimedia table with information on multimedia data included in a multimedia table list stored in the mobile multimedia terminal; adding to the multimedia table list a multimedia table that corresponds to multimedia data that are not redundant as the result of the testing; and transmitting the multimedia script file stored in the external device to the mobile multimedia terminal.
  • a method for playing a multimedia script file and a multimedia database in a mobile multimedia terminal comprising the steps of: interpreting a page object included in the multimedia script file; interpreting a multimedia data object included in the page object; outputting interpretation results of the multimedia data object to a display means or audio input/output means of the mobile multimedia terminal; determining whether a next page object is present in the multimedia script file; stopping playing the multimedia script file and the multimedia database if the next page object is not present; and repeating first four steps if the next page object is present.
  • Fig. 1 is a block diagram of a mobile multimedia terminal in accordance with a preferred embodiment of the present invention
  • Fig. 2 is a block diagram of a user authentication means in accordance with a preferred embodiment of the present invention.
  • Fig. 3 is a flowchart of a hardware user authentication method in accordance with a preferred embodiment of the present invention.
  • Fig. 4 is a flowchart of a software user authentication method in accordance with a preferred embodiment of the present invention
  • Fig. 5 is a flowchart of a software user authentication method in accordance with another preferred embodiment of the present invention.
  • Fig. 6A is a block diagram of a multimedia script file in accordance with a preferred embodiment of the present invention.
  • Fig. 6B is a block diagram of an audio file table in accordance with a preferred embodiment of the present invention.
  • Fig. 6C is a block diagram of an image database table in accordance with a preferred embodiment of the present invention.
  • Fig. 6D is a block diagram of a font database table in accordance with a preferred embodiment of the present invention.
  • Fig. 6E is a block diagram of a script data in accordance with a preferred embodiment of the present invention.
  • Fig. 7 is a block diagram of a multimedia database in accordance with a preferred embodiment of the present invention
  • Fig. 8 is a flowchart showing a process of compactly storing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention
  • Fig. 9 is a flowchart showing a sub-process of determining an audio file name in the process of compactly storing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention.
  • Fig. 10 is a flowchart showing a process of playing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention.
  • Fig. 1 is a block diagram of a mobile multimedia terminal in accordance with a preferred embodiment of the present invention.
  • the mobile multimedia terminal 1000 includes a CPU 100, a boot ROM 210, a RAM 220, a flash ROM 230, an expanded memory 240, a data transmission/reception means 300, an audio input/output means 400, a function key input means 600, a display means 700, a user authentication means 800, and a power supply means 900.
  • the CPU 100 controls the function key input means 600, and performs an appropriate control in response to the input of function keys. For example, if a function key for controlling sound volume is input, the CPU 100 controls the audio input/output means 400 so that the level of audio input is adjusted in response to the input of such a function key. Further, the CPU 100 controls the display means 700. For example, if the display means 700 is embodied as a Liquid Crystal Display (LCD) , the CPU 100 controls the On/Off switching of a backlight of the LCD and the input of data through a pen of the LCD. The CPU 100 may preferably perform a character recognition function in response to the pen input of a user.
  • LCD Liquid Crystal Display
  • the CPU 100 controls data input/output to/from a storage means 200 including the boot ROM 210, the RAM 220, the flash ROM 230 and the expanded memory 240.
  • the CPU 100 is connected to the storage means 200 through a data bus and an address bus.
  • the position of data within the storage means 200 is determined by an address that is transmitted thereto through the address bus.
  • the data whose position is determined by the address is transmitted/received through the data bus.
  • the CPU 100 controls the data transmission/reception means 300 adapted to carry out data transmission/reception to/from external devices (not shown) , and the audio input/output means 400.
  • the CPU 100 exchanges user authentication information with the user authentication means 800, and executes a user authentication program that receives user authentication information received from the user authentication means 800 as its input.
  • the CPU 100 serves to prevent redundant data from being stored in the storage means 200 by testing for the redundancy of script files and multimedia data received from an external device (not shown) .
  • the function key input means 600 includes a plurality of function keys that are capable of instructing the CPU 100 to perform main functions of the mobile multimedia terminal 1000.
  • the function keys include a power key, a sound volume control key, a multimedia data play key, a stop key and a reverse play key.
  • the kinds and number of the function keys are not restricted to those of the above- described function keys, but can be changed as occasion demands .
  • the display means 700 includes, e.g., an LCD panel, and can be provided with a touch screen function for the convenience of a user interface.
  • the display means 700 preferably has a screen brightness control function.
  • the audio input/output means 400 controls the input/output of audio data.
  • the audio input/output means 400 includes an Analog/Digital (A/D) converter and a Digital/Analog (D/A) converter, and may further includes a Digital Signal Processor (DSP) to compress and expand audio data.
  • DSP Digital Signal Processor
  • the function of DSP can be implemented in software to be carried out by the CPU 100.
  • the power supply means 900 preferably includes a rechargeable secondary battery, and more preferably includes an Alternating Current (AC) adaptor terminal.
  • AC Alternating Current
  • the external power source supplies power to component elements of the mobile multimedia terminal 1000 and charges the second battery with electricity.
  • the secondary battery supplies power to the mobile multimedia terminal 1000.
  • the power is supplied from the power supply means 900 to the component elements of the system with its voltage transformed into different voltages according to these component elements.
  • the user authentication means 800 includes information that is used to carry out a user authentication when the mobile multimedia terminal of the present invention is initialized.
  • Fig. 2 is a detailed block diagram of the user authentication means 800.
  • the user authentication means 800 includes a ROM 810 in which an encoded hardware identification number is stored and a ROM 820 in which a decoded hardware identification number is stored.
  • the encoded and decoded hardware identification numbers are respectively stored in the ROMs 810 and 820 when the mobile multimedia terminal 1000 is manufactured, cannot be changed thereafter, and are used as input data for the user authentication program to be executed by the CPU 100.
  • a hardware user authentication method performed by the user authentication means 800 is illustrated in Fig. 3.
  • the user authentication program stored in the boot ROM 210 or the flash ROM 230 is loaded into the CPU 100 (step 2100) .
  • the user authentication program is executed by the CPU 100, and reads the encoded and decoded hardware identification numbers stored in the user authentication means 800 (step 2200) .
  • the user authentication program decodes the encoded hardware identification number and stores a decoded result in the storage means 200 or a buffer (not shown) of the CPU 100 (step 2300) .
  • the user authentication program compares the decoded result with the decoded hardware identification number (step 2400) .
  • the user authentication means 800 can be used as a means for protecting the copyrights of multimedia contents or software that are downloaded through a communication network such as the Internet.
  • a software user authentication method performed by the user authentication means 800 is illustrated in Fig. 4. First, a user of the mobile multimedia terminals 1000 registers at a server of a multimedia contents provider through a communication network. At this time, an encoded hardware identification number stored in the user authentication means 800 of the mobile multimedia terminal 1000 is transmitted to the server.
  • the server of the multimedia contents provider stores and manages encoded hardware identification numbers received from users. After the user connects to the server of the multimedia contents provider via the communication network using the mobile multimedia terminal 1000, the user transmits the decoded hardware identification number and requests the server of the multimedia contents provider to download multimedia contents therefrom (step 8200).
  • the server decodes the encoded hardware identification number stored and managed in the server and stores a decoded result (step 8300) .
  • the server compares the decoded result with the decoded hardware identification number received from the mobile multimedia terminal 1000 (step 8400) . If the decoded result coincides with the decoded hardware identification number received from the mobile multimedia terminal 1000, the server transmits the requested multimedia contents to the mobile multimedia terminal 1000
  • step 8500 If the decoded result does not coincide with the decoded hardware identification number received from the mobile multimedia terminal 1000, the server disapproves the transmission of the requested multimedia contents (step 8600) .
  • the software user authentication process may be performed by the mobile multimedia terminal 1000.
  • Such a software user authentication method performed by the mobile multimedia terminal 1000 is illustrated in Fig. 5.
  • a user of the mobile multimedia terminals 1000 registers at a server of a multimedia contents provider through a communication network.
  • the encoded hardware identification number stored in the user authentication means 800 of the mobile multimedia terminal 1000 is transmitted to the server.
  • the server of the multimedia contents provider stores and manages encoded hardware identification numbers received from users.
  • the user After the user connects to the server of the multimedia contents provider via the communication network using the mobile multimedia terminal 1000, the user requests the server of the multimedia contents provider to download multimedia contents therefrom (step 9200) .
  • the server transmits the encoded hardware identification number stored and managed in the server to the mobile multimedia terminal 1000 (step 9300).
  • the mobile multimedia terminal 1000 which has received the encoded hardware identification number from the server, decodes the encoded hardware identification number and stores a decoded result (step 9400).
  • the mobile multimedia terminal 1000 compares the decoded result with the decoded hardware identification number stored in the user authentication means 800, and transmits a comparison result to the server (step 9500) .
  • the server interprets the comparison result (step 9600) . If the decoded result coincides with the decoded hardware identification number stored in the user authentication means 800, the server transmits the requested multimedia contents to the mobile multimedia terminal 1000 (step 9700) .
  • the server disapproves the transmission of the requested multimedia contents (step 9800) .
  • the boot ROM 210 stores a system initializing program that is executed when the mobile multimedia terminal 1000 is started by its power source.
  • the system initializing program is read from the boot ROM 210, stored in the RAM 220 and executed by the CPU 100.
  • the system initializing program stored in the boot ROM 210 can include driver programs for the control of the function key input means 600, the display means 700, the data transmission/reception means 300 and the audio input/output means 400.
  • the RAM 220 is used as a temporary storage means for the system initializing program read from the boot ROM 210 or multimedia data.
  • the flash ROM 230 is a nonvolatile memory that is used as a storage means for multimedia data.
  • Multimedia data handled in the mobile multimedia terminal 1000 can be received through the data transmission/reception means 300 from an external device.
  • the data transmission/reception means 300 transmits/receives data to/from the external device in accordance with the USB (Universal Serial Bus) standard.
  • the mobile multimedia terminal 1000 can receive multimedia data from an external device and transmit multimedia data stored in the storage means 200 of the mobile multimedia terminal 1000 to the external device.
  • programs that can be used in the mobile multimedia terminal 1000 may be transmitted and received through the data transmission/reception means 300.
  • Multimedia data received through the data transmission/reception means 300 can be stored in the flash ROM 230.
  • Multimedia data stored in the flash ROM 230 can include a multimedia script file 3000, a multimedia database 4000 or other files.
  • the architecture of the multimedia script file 3000 is illustrated in Fig. 6A, while the architecture of the multimedia database 4000 is illustrated in Fig. 7.
  • the multimedia script file 3000 describes information relating to the component elements of multimedia contents, such as moving picture, music, animation, etc., and the temporal and spatial relationships of the component elements.
  • the multimedia script file 3000 is interpreted and played by a multimedia script playing program executed by the CPU 100.
  • the multimedia script file 3000 includes copyright information of a multimedia work 3100, a title of a multimedia work 3200, an audio file table 3300, an image database table 3400, a font database table 3500 and script data 3600.
  • the audio file table 3300 includes the number of audio files currently stored in the multimedia database 4000 and other information on these audio files.
  • the architecture of the audio file table 3300 is illustrated in Fig. 6B .
  • the audio file table 3300 includes the number of audio files 3310 currently stored in the multimedia database 4000, the IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360.
  • the IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360 correspond to respective audio files 4300 (refer to Fig. 7) .
  • a set of the IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360 corresponds to each of the audio files.
  • the first names of audio files 3350 represent the original names of audio files
  • the second names of audio files 3360 are used to manage audio files that have contents identical with those of their original files but names different from those of their original files.
  • the error detection codes of audio files 3340 are used to detect data transmission errors when the mobile multimedia terminal 1000 transmits/receives audio files to/from an external device, and to determine whether the contents of audio files are identical with each other in the process of compactly storing multimedia data.
  • the error detection codes of audio files 3340 can be Cyclic Redundancy Check (CRC) codes.
  • CRC Cyclic Redundancy Check
  • the image database table 3400 includes the number of images currently stored in the multimedia database 4000 and other information on these images.
  • the architecture of the image database table 3400 is illustrated in Fig. 6C.
  • the image database table 3400 has an architecture similar to that of the audio file table 3300, so a detailed description of the architecture is omitted.
  • the font database table 3500 includes the total number of fonts currently stored in the multimedia database 4000 and other information on these fonts.
  • the architecture of the font database table 3500 is illustrated in Fig. 6D.
  • the font database table 3500 includes the total number of fonts 3510 currently stored in the multimedia database, font names 3520, the numbers of fonts 3530 and font codes 3540.
  • the font names 3520 represent the kinds of fonts such as "Courier New", “Times New Roman”, etc.
  • the numbers of fonts 3530 represent the numbers of fonts that are represented by the font names 3520,- respectively. For example, if the number of the currently used fonts of "Courier New" are 5, "5" is stored as the number of fonts 3530.
  • the font codes 3540 can be an ASCII code, a Hangul (Korean character) code, a Chinese character code, etc., and the number of the font codes 3540 corresponds to the numbers of fonts 3530.
  • a set of the font names 3520, the numbers of fonts 3530 and the font codes 40 is generated to correspond to one kind of font, and the total number of fonts 3510 is the sum of all of the numbers of fonts 3530.
  • the script data 3600 includes information on the playing order and contents of multimedia data.
  • the multimedia script includes pages that are temporally connected to one another. Each of those pages includes information on multimedia data that are included in the page to be played.
  • the architecture of the script data 3600 is illustrated in Fig. 6E .
  • the script data 3600 includes one or more page objects 3610.
  • Each of the page objects 3610 includes a page ID 3611, a page length 3612, a previous page ID 3613, a next page ID 3614, one or more window objects 3620, one or more sound objects 3630, one or more text objects 3640, and one or more image objects 3650.
  • the page ID 3611 is an identification number representing the page object 3610
  • the previous page ID 3613 is the ID of a page object that has been interpreted and played
  • the next page ID 3614 is the ID of a page object that is to be interpreted and played.
  • the number of each of the window objects 3620, the sound objects 3630, the text objects 3640 and the image objects 3650 may be one or more.
  • the window objects 3620 represent information on windows included in pages.
  • Each of the window objects 3620 includes a window ID 3621, an upper left position coordinate 3622 and a lower right position coordinate 3623.
  • the sound objects 3630 represent information on sounds (voices, music, etc.) included in pages.
  • Each of the sound objects 3630 includes a sound ID 3631, time information 3632 and an audio file ID 3633.
  • the time information 3622 may include start times for playing sounds and finish times for playing sounds.
  • the audio file IDs 3633 each coincide with one of the audio file IDs 3320 stored in the audio file table, and are used to search for audio files 4300 stored in the multimedia database 4000 when multimedia data are to be played.
  • the text objects 3640 represent information on texts (sentences, pictograph, etc.) included in pages, and each include a text ID 3641, time information 3642, a text position 3643, visual effect information of a text 3644 and a font database table index list 3645.
  • the time information 3642 can include start times for displaying texts and finish times for displaying texts.
  • the text position 3643 represents a position where the text is to be displayed, and may be X-Y coordinate information of the display screen of the mobile multimedia terminal 1000.
  • the fort database table index list 3643 is the index list of the font database table 3500 included in a multimedia script file, and is used to search for font data 4100 stored in the multimedia database 4000 when multimedia data are to be played.
  • the image objects 3650 represent information on images (photographs, animation cells, moving picture frames, etc.) included in pages, and each include an image ID 3651, time information 3652, an image position 3653, visual effect information of an image 3654 and an image ID list 3655.
  • the time information 3652 can be start times for displaying images and finish times for displaying images.
  • the image position 3653 can be the X-Y coordinate information of the display screen of the mobile multimedia terminal 1000.
  • the visual effect information 3654 of images can be special visual effects (blurring, inverting, smoothing, etc.) and the frame numbers and frame time values of moving pictures.
  • the image ID list 3655 coincides with one of the image IDs 3410 stored in the image database table, and used to search for image data 4200 stored in the multimedia database 4000 when multimedia data are to be played.
  • a user or a multimedia contents provider may generate a multimedia script file 3000 and a multimedia database 4000 using a multimedia authoring tool program on an external device distinguished from the mobile multimedia terminal 1000.
  • the multimedia script file 3000 and the multimedia database 4000 generated as described above can be transmitted to the mobile multimedia terminal 1000 through the data transmission/reception means 300 of the mobile multimedia terminal 1000.
  • the multimedia file 3000 and the multimedia database 4000 may include multiple data each of which has identical contents with respect to each other, so there is required a method of compactly storing data so as to eliminate a data redundancy.
  • Fig. 8 shows a process in which the multimedia script file 3000 and the multimedia database 4000 generated in the external device are transmitted to the mobile multimedia terminal 1000 and compactly stored therein.
  • an audio file table 3300, an image database table 3400 and a font database table 3500 of a multimedia script file 3000 generated in an external device are transmitted to a mobile multimedia terminal 1000 (step 5100) . Thereafter, it is determined whether a multimedia database 4000 is previously stored in the mobile multimedia terminal 1000 (step 5200) .
  • the multimedia script file 3000 and the multimedia database 4000 generated in the external device are transmitted to the mobile multimedia terminal 1000 and stored in a storage means 200 of the mobile multimedia terminal 1000 (step 5300) .
  • redundancy tests for font data, audio files and image data are carried out (step 5400) .
  • the redundancy test for font data is carried out as follows. That is, this redundancy test is carried out in such a way as to compare font names 3520 and font codes 3540 included in the font database table transmitted from the external device and temporarily stored in the storage means 200 of the mobile multimedia terminal 1000 with those stored in the font database table included in the font database table list previously stored in the storage means 200 of the mobile multimedia terminal 1000, and to judge that the redundancy of font data is present if the former data coincide with the latter data.
  • the redundancy test for audio files is carried out as follows. That is, this redundancy test is carried out in such a way as to compare the lengths of audio files 3330 and the error detection codes of audio files 3340 included in an audio file table transmitted from an external device and temporarily stored in the storage means 200 of the mobile multimedia terminal 1000 with those included in the audio find table included in the audio file table list previously stored in the storage means 200 of the mobile multimedia terminal 1000, and to judge that the redundancy of audio files is present if the former data coincide with the latter data.
  • the redundancy test for image data is carried out in the same way as the redundancy test for audio files is carried out, i.e., by the comparison of the lengths of image data 3430 and the error detection codes of image data 3460.
  • a process of determining the first and second file names 3350 and 3360 in the process of testing for the redundancy of audio files and compactly storing audio files is illustrated in Fig. 9.
  • an audio file is stored in an external device 8000
  • the name of an audio file (e.g., "A.mp3") is stored in a first file name 6111 of an audio file table 6110 that includes information on the audio file.
  • a second file name 6112 is stored as randomly chosen characters (e.g., "xxx.zzz”). If an audio file identical with the audio file ("A.mp3”) is not found by the above- described redundancy test for audio files, a second file name 6212 included in a multimedia script file 6200 stored in the mobile multimedia terminal 1000 is set to the name of the audio file ("A.mp3”) .
  • the above-described process is performed also when another multimedia script file 6400 stored in the external device 8000 is transmitted to the mobile multimedia terminal 1000.
  • a first file name 6411 (“B.mp3") is not identical with an audio file name 6310 (“A.mp3") included in an audio file table list 6300 stored in the mobile multimedia terminal 1000.
  • a second file name 6512 included in an audio file table 6510 is stored as an audio file name 6310 stored in the audio file table list 6300. That is, a first file name 6511 becomes an original audio file name ("B.mp3”), while the second file name 6512 is used to search for the audio file
  • Audio files with identical contents are prevented from being redundantly stored.
  • a process of testing for the redundancy of image data and compactly storing image data is the same as that for audio files, so a description of the process is omitted.
  • the audio file table 3300, the image database table 3400 and the font database table 3500 transmitted to the mobile multimedia terminal 1000 are added on to and stored in the audio file table list, the image database table list and the font database table list stored in the storage means 200 of the mobile multimedia terminal 1000, respectively (step 5600).
  • FIG. 10 A process of playing the multimedia script file 3000 and the multimedia database 4000 stored in the mobile multimedia terminal 1000 is illustrated in Fig. 10.
  • a page object 3610 included in the multimedia script file 3000 is read (step 7100) .
  • a window object 3620, a sound object 3630, a text object 3640 and an image object 3650 included in the page object 3610 are interpreted and outputted to the display means 700 and the audio input/output means 400 (step 7200) .
  • an audio file 4300 stored in the multimedia database 4000 is searched for by using an audio file ID 3633 included in the sound object 3630. That is, audio file tables included in the multimedia script file are searched for an audio file table of an audio file ID identical with the audio file ID 3633 by using the audio file ID 3633, and audio files stored in the multimedia database by using the second file name of the audio file table.
  • a font database table index list 3645 is included in the text object 3640. This is the index of a font database table included in the multimedia script file.
  • the font database table included in the multimedia script file is searched for by using the font database table index, and font data stored in the multimedia database are searched for by using searched information included in the font database table.
  • next page object is present (step 7300) . It can be determined by using a next page ID 3614 included in the page object 3610 whether the next page object is present. If the next page object is not present, the process of playing the multimedia script file is terminated. If the next page object is present, the above-described process of interpreting and playing the page object (steps 7100 to 7300) is repeated.
  • the present invention provides a mobile multimedia terminal and a method for controlling same, wherein only one of redundant data is stored and only the pointers of multimedia data are searched for the playing of multimedia data, so that the storage means can be effectively utilized and rapid multimedia data search is enabled.
  • the mobile multimedia terminal of the present invention includes the user authentication means wherein a user authentication can be carried out by using the information stored in the user authentication means at a system initializing stage of the mobile multimedia terminal, thereby preventing the mobile multimedia terminal from being illegally reproduced.
  • the user authentication means can be used as a means for preventing software from being illegally copied when the mobile multimedia terminal receives data such as multimedia contents or software from an external device through a communication network.

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Abstract

There is provided a mobile multimedia terminal for storing and playing multimedia data and a method for controlling same. The mobile multimedia terminal includes a data transmission/reception means, a storage means, a control means, an audio input/output means, a function key input means, and a display means. The storage means has a first storage unit for storing multimedia data and a second storage unit for temporarily storing multimedia data received from the external device through the data transmission/reception means. The control means stores multimedia data of the second storage unit not identical with that of the first storage unit in the first storage unit by performing a redundancy test in which the lengths and error detection codes of the multimedia data of the first and second storage units are compared with each other, respectively.

Description

MOBILE MULTIMEDIA TERMINAL AND METHOD FOR CONTROLLING SAME
FIELD OF THE INVENTION
The present invention relates generally to a mobile multimedia terminal and method of controlling same; and, more particularly, to a mobile multimedia terminal and a method for controlling same, which has functions of compactly storing and playing multimedia data and performing a user authentication for software and hardware.
BACKGROUND OF THE INVENTION
With the popularization and rapid performance improvement of Personal Computers (PCs) , general users currently play multimedia data in real time on their desktop computers. Additionally, with the performance improvement and miniaturization of general-purpose processors and multimedia processors used in PCs, there appear mobile multimedia terminals that are capable of playing multimedia. As examples of such mobile terminals, there are notebook computers, handheld PCs, Personal Digital Assistants (PDAs) and multimedia mobile phones. PDA-level terminals are most suitable for such mobile multimedia terminals in terms of the ratio of price to performance, portability and the convenience of its user interface. In order to meet such a current trend, recently marketed PDAs are provided with functions of a personal information management, a word-processing, Internet communications, general telephone communications, and the playing of moving pictures and Moving Pictures Expert Group-1 Audio Layer-3 (MP3) music files.
An example of a mobile multimedia terminal having such a variety of functions is disclosed in Korean Patent Laid-Open Publication No. 2000-032949 (hereinafter, referred to as "prior art 1") . Like the prior art 1, a conventional mobile multimedia terminal is comprised of parts described below.
That is, the conventional mobile multimedia terminal includes a Central Processing Unit (CPU) adapted to control data transmission/reception to/from external devices, a user interface, a memory operation and multimedia data input/output; a function key input means for controlling the selection of function keys; an audio input/output means for controlling the input and output of audio data; a display means for displaying information; a data storage means comprised of a Read-Only Memory (ROM) , a Random Access Memory (RAM) and a flash RAM and designed to store various data and programs; and a data transmission/reception means for transmitting/receiving data to/from an external device.
In general, a conventional mobile multimedia terminal includes a storage means for storing multimedia data. The storage means has a basic capacity of 8MB to 32MB, and is extendable. However, the storage means basically provided in the conventional mobile multimedia terminal has a limitation in storing multimedia data. Accordingly, an additional memory extension pack must be purchased so as to store a large amount of multimedia data, so there are caused an inconvenience and a cost increase. As a result, there are needed a method and an apparatus for efficiently storing a large amount of multimedia data without increasing costs.
Recently, miniaturized, high-performance mobile multimedia terminals have been popularized. Such mobile multimedia terminals are relatively expensive and small, so they are easily stolen or illegally reproduced. Additionally, they store and play various types of multimedia contents in the form of digital data, so a means for preventing an illegal reproduction of such multimedia contents is required. There are disclosed means to overcome the above-described problems in Korean Patent Laid-Open Publication No. 2000-054205 (hereinafter, referred to as "prior 2" ) and Korean Patent Laid-Open Publication No. 2001-001790 (hereinafter, referred to as "prior 3") .
In the prior art 2, the author of multimedia contents possesses his own use authorization key and encodes the multimedia contents using the use authorization key, while a user of the multimedia contents acquires the use authorization key through a licensing process and decodes/utilizes the encoded multimedia contents using the use authorization key. In the prior art 3, multimedia data are encoded using an additional IDentification (ID) and the encoded multimedia data are decoded using the ID, so the illegal reproduction of multimedia data can be prevented.
As described above, the prior arts 2 and 3 provide means for preventing an illegal reproduction of multimedia contents. However, the prior arts 2 and 3 are disadvantageous in that they do not provide means for preventing an illegal reproduction of hardware. Further, the use authorization keys or the IDs used in encoding can be easily copied.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the present invention to provide a mobile multimedia terminal and a method for controlling same, which is capable of storing and managing a large amount of multimedia data without redundancy by classifying multimedia data stored in the mobile multimedia terminal into various types, examining the redundancy of each type of multimedia data and storing only one of redundant multimedia data if the redundancy of multimedia data is present. Another object of the present invention is to provide a mobile multimedia terminal and a method for controlling same, which includes a user authentication means, wherein a user authentication can be carried out by using an encoded unique hardware number included in the user authentication means, thereby preventing software and hardware from being illegally copied.
In accordance with one aspect of the present invention, there is provided a mobile multimedia terminal for storing and playing multimedia data, comprising: a data transmission/reception means for controlling transmission/reception of multimedia data to/from an external device; a storage means including a first storage unit for storing multimedia data to be played and a second storage unit for temporarily storing multimedia data received from the external device through the data transmission/reception means; a control means for storing multimedia data of the second storage unit not identical with the multimedia data of the first storage unit in the first storage unit by performing a redundancy test in which lengths and error detection codes of the multimedia data of the first and second storage units are compared with each other, respectively; an audio input/output means for controlling input/output of audio data; a function key input means for directing a selection of multimedia data and an execution of a multimedia data playing program; and a display means for showing results of playing of multimedia data.
In accordance with another aspect of the present invention, there is provided a method for authenticating a hardware user of a mobile multimedia terminal having a user authentication means, comprising the steps of: inputting an encoded hardware identification number and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number with the decoded hardware identification number; and stopping an operation of the mobile multimedia terminal if the decoded result coincides with the decoded hardware identification number.
In accordance with still another aspect of the present invention, there is provided a method for authenticating a software user of a mobile multimedia terminal having a user authentication means, comprising the steps of: inputting an encoded hardware identification number received from an external device and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number received from an external device with the decoded hardware identification number; and stopping a reception of data and/or a program from the external device if the decoded result coincides with the decoded hardware identification number.
In accordance with still another aspect of the present invention, there is provided a method for storing multimedia data including a multimedia script file and a multimedia database in a mobile multimedia terminal', comprising the steps of: transmitting a multimedia table included in a multimedia script file stored in an external device to the mobile multimedia terminal; testing for a redundancy of the multimedia database by comparing information on multimedia data included in the multimedia table with information on multimedia data included in a multimedia table list stored in the mobile multimedia terminal; adding to the multimedia table list a multimedia table that corresponds to multimedia data that are not redundant as the result of the testing; and transmitting the multimedia script file stored in the external device to the mobile multimedia terminal.
In accordance with still another aspect of the present invention, there is provided a method for playing a multimedia script file and a multimedia database in a mobile multimedia terminal, comprising the steps of: interpreting a page object included in the multimedia script file; interpreting a multimedia data object included in the page object; outputting interpretation results of the multimedia data object to a display means or audio input/output means of the mobile multimedia terminal; determining whether a next page object is present in the multimedia script file; stopping playing the multimedia script file and the multimedia database if the next page object is not present; and repeating first four steps if the next page object is present.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and features of the invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
Fig. 1 is a block diagram of a mobile multimedia terminal in accordance with a preferred embodiment of the present invention;
Fig. 2 is a block diagram of a user authentication means in accordance with a preferred embodiment of the present invention;
Fig. 3 is a flowchart of a hardware user authentication method in accordance with a preferred embodiment of the present invention;
Fig. 4 is a flowchart of a software user authentication method in accordance with a preferred embodiment of the present invention; Fig. 5 is a flowchart of a software user authentication method in accordance with another preferred embodiment of the present invention;
Fig. 6A is a block diagram of a multimedia script file in accordance with a preferred embodiment of the present invention;
Fig. 6B is a block diagram of an audio file table in accordance with a preferred embodiment of the present invention;
Fig. 6C is a block diagram of an image database table in accordance with a preferred embodiment of the present invention;
Fig. 6D is a block diagram of a font database table in accordance with a preferred embodiment of the present invention;
Fig. 6E is a block diagram of a script data in accordance with a preferred embodiment of the present invention;
Fig. 7 is a block diagram of a multimedia database in accordance with a preferred embodiment of the present invention; Fig. 8 is a flowchart showing a process of compactly storing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention;
Fig. 9 is a flowchart showing a sub-process of determining an audio file name in the process of compactly storing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention; and
Fig. 10 is a flowchart showing a process of playing a multimedia script file and a multimedia database in accordance with a preferred embodiment of the present invention.
DESCRIPTION OF SPECIFIC EMBODIMENTS
Fig. 1 is a block diagram of a mobile multimedia terminal in accordance with a preferred embodiment of the present invention. Referring to Fig. 1, the mobile multimedia terminal 1000 includes a CPU 100, a boot ROM 210, a RAM 220, a flash ROM 230, an expanded memory 240, a data transmission/reception means 300, an audio input/output means 400, a function key input means 600, a display means 700, a user authentication means 800, and a power supply means 900.
The CPU 100 controls the function key input means 600, and performs an appropriate control in response to the input of function keys. For example, if a function key for controlling sound volume is input, the CPU 100 controls the audio input/output means 400 so that the level of audio input is adjusted in response to the input of such a function key. Further, the CPU 100 controls the display means 700. For example, if the display means 700 is embodied as a Liquid Crystal Display (LCD) , the CPU 100 controls the On/Off switching of a backlight of the LCD and the input of data through a pen of the LCD. The CPU 100 may preferably perform a character recognition function in response to the pen input of a user.
The CPU 100 controls data input/output to/from a storage means 200 including the boot ROM 210, the RAM 220, the flash ROM 230 and the expanded memory 240. The CPU 100 is connected to the storage means 200 through a data bus and an address bus. The position of data within the storage means 200 is determined by an address that is transmitted thereto through the address bus. The data whose position is determined by the address is transmitted/received through the data bus.
In the meanwhile, the CPU 100 controls the data transmission/reception means 300 adapted to carry out data transmission/reception to/from external devices (not shown) , and the audio input/output means 400. The CPU 100 exchanges user authentication information with the user authentication means 800, and executes a user authentication program that receives user authentication information received from the user authentication means 800 as its input. Additionally, the CPU 100 serves to prevent redundant data from being stored in the storage means 200 by testing for the redundancy of script files and multimedia data received from an external device (not shown) .
The function key input means 600 includes a plurality of function keys that are capable of instructing the CPU 100 to perform main functions of the mobile multimedia terminal 1000. The function keys include a power key, a sound volume control key, a multimedia data play key, a stop key and a reverse play key. The kinds and number of the function keys are not restricted to those of the above- described function keys, but can be changed as occasion demands .
The display means 700 includes, e.g., an LCD panel, and can be provided with a touch screen function for the convenience of a user interface. The display means 700 preferably has a screen brightness control function.
The audio input/output means 400 controls the input/output of audio data. The audio input/output means 400 includes an Analog/Digital (A/D) converter and a Digital/Analog (D/A) converter, and may further includes a Digital Signal Processor (DSP) to compress and expand audio data. As occasion demands, the function of DSP can be implemented in software to be carried out by the CPU 100.
The power supply means 900 preferably includes a rechargeable secondary battery, and more preferably includes an Alternating Current (AC) adaptor terminal. When power is supplied from an external power source through an AC adaptor, the external power source supplies power to component elements of the mobile multimedia terminal 1000 and charges the second battery with electricity. Otherwise, when power is not supplied through the AC adaptor, the secondary battery supplies power to the mobile multimedia terminal 1000. The power is supplied from the power supply means 900 to the component elements of the system with its voltage transformed into different voltages according to these component elements.
The user authentication means 800 includes information that is used to carry out a user authentication when the mobile multimedia terminal of the present invention is initialized. Fig. 2 is a detailed block diagram of the user authentication means 800. Referring to Fig. 2, the user authentication means 800 includes a ROM 810 in which an encoded hardware identification number is stored and a ROM 820 in which a decoded hardware identification number is stored. The encoded and decoded hardware identification numbers are respectively stored in the ROMs 810 and 820 when the mobile multimedia terminal 1000 is manufactured, cannot be changed thereafter, and are used as input data for the user authentication program to be executed by the CPU 100.
A hardware user authentication method performed by the user authentication means 800 is illustrated in Fig. 3. First, at a system initialization step, the user authentication program stored in the boot ROM 210 or the flash ROM 230 is loaded into the CPU 100 (step 2100) . Thereafter, the user authentication program is executed by the CPU 100, and reads the encoded and decoded hardware identification numbers stored in the user authentication means 800 (step 2200) . The user authentication program decodes the encoded hardware identification number and stores a decoded result in the storage means 200 or a buffer (not shown) of the CPU 100 (step 2300) . The user authentication program compares the decoded result with the decoded hardware identification number (step 2400) . If the decoded result coincides with the decoded hardware identification number, the mobile multimedia terminal 1000 finishes the user authentication process and performs a next system operation (step 2500) . However, if the decoded result does not coincide with the decoded hardware identification number, the mobile multimedia terminal 1000 stops its operation (step 2600) . The user authentication means 800 can be used as a means for protecting the copyrights of multimedia contents or software that are downloaded through a communication network such as the Internet. A software user authentication method performed by the user authentication means 800 is illustrated in Fig. 4. First, a user of the mobile multimedia terminals 1000 registers at a server of a multimedia contents provider through a communication network. At this time, an encoded hardware identification number stored in the user authentication means 800 of the mobile multimedia terminal 1000 is transmitted to the server. The server of the multimedia contents provider stores and manages encoded hardware identification numbers received from users. After the user connects to the server of the multimedia contents provider via the communication network using the mobile multimedia terminal 1000, the user transmits the decoded hardware identification number and requests the server of the multimedia contents provider to download multimedia contents therefrom (step 8200). The server decodes the encoded hardware identification number stored and managed in the server and stores a decoded result (step 8300) . The server compares the decoded result with the decoded hardware identification number received from the mobile multimedia terminal 1000 (step 8400) . If the decoded result coincides with the decoded hardware identification number received from the mobile multimedia terminal 1000, the server transmits the requested multimedia contents to the mobile multimedia terminal 1000
(step 8500) . If the decoded result does not coincide with the decoded hardware identification number received from the mobile multimedia terminal 1000, the server disapproves the transmission of the requested multimedia contents (step 8600) .
Although the above-described software user authentication process is described as being performed by the server of the multimedia contents provider, the software user authentication process may be performed by the mobile multimedia terminal 1000. Such a software user authentication method performed by the mobile multimedia terminal 1000 is illustrated in Fig. 5. First, a user of the mobile multimedia terminals 1000 registers at a server of a multimedia contents provider through a communication network. At this time, the encoded hardware identification number stored in the user authentication means 800 of the mobile multimedia terminal 1000 is transmitted to the server. The server of the multimedia contents provider stores and manages encoded hardware identification numbers received from users. After the user connects to the server of the multimedia contents provider via the communication network using the mobile multimedia terminal 1000, the user requests the server of the multimedia contents provider to download multimedia contents therefrom (step 9200) . The server transmits the encoded hardware identification number stored and managed in the server to the mobile multimedia terminal 1000 (step 9300). The mobile multimedia terminal 1000, which has received the encoded hardware identification number from the server, decodes the encoded hardware identification number and stores a decoded result (step 9400). The mobile multimedia terminal 1000 compares the decoded result with the decoded hardware identification number stored in the user authentication means 800, and transmits a comparison result to the server (step 9500) . The server interprets the comparison result (step 9600) . If the decoded result coincides with the decoded hardware identification number stored in the user authentication means 800, the server transmits the requested multimedia contents to the mobile multimedia terminal 1000 (step 9700) . If the decoded result does not coincide with the decoded hardware identification number stored in the user authentication means 800, the server disapproves the transmission of the requested multimedia contents (step 9800) . Meanwhile, the boot ROM 210 stores a system initializing program that is executed when the mobile multimedia terminal 1000 is started by its power source. When the mobile multimedia terminal 1000 is started, the system initializing program is read from the boot ROM 210, stored in the RAM 220 and executed by the CPU 100. The system initializing program stored in the boot ROM 210 can include driver programs for the control of the function key input means 600, the display means 700, the data transmission/reception means 300 and the audio input/output means 400. The RAM 220 is used as a temporary storage means for the system initializing program read from the boot ROM 210 or multimedia data. The flash ROM 230 is a nonvolatile memory that is used as a storage means for multimedia data.
Multimedia data handled in the mobile multimedia terminal 1000 can be received through the data transmission/reception means 300 from an external device. Preferably, the data transmission/reception means 300 transmits/receives data to/from the external device in accordance with the USB (Universal Serial Bus) standard. The mobile multimedia terminal 1000 can receive multimedia data from an external device and transmit multimedia data stored in the storage means 200 of the mobile multimedia terminal 1000 to the external device. As occasion demands, programs that can be used in the mobile multimedia terminal 1000 may be transmitted and received through the data transmission/reception means 300.
Multimedia data received through the data transmission/reception means 300 can be stored in the flash ROM 230. Multimedia data stored in the flash ROM 230 can include a multimedia script file 3000, a multimedia database 4000 or other files. The architecture of the multimedia script file 3000 is illustrated in Fig. 6A, while the architecture of the multimedia database 4000 is illustrated in Fig. 7. The multimedia script file 3000 describes information relating to the component elements of multimedia contents, such as moving picture, music, animation, etc., and the temporal and spatial relationships of the component elements. The multimedia script file 3000 is interpreted and played by a multimedia script playing program executed by the CPU 100. Further, the multimedia script file 3000 includes copyright information of a multimedia work 3100, a title of a multimedia work 3200, an audio file table 3300, an image database table 3400, a font database table 3500 and script data 3600. The audio file table 3300 includes the number of audio files currently stored in the multimedia database 4000 and other information on these audio files. The architecture of the audio file table 3300 is illustrated in Fig. 6B . The audio file table 3300 includes the number of audio files 3310 currently stored in the multimedia database 4000, the IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360. The IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360 correspond to respective audio files 4300 (refer to Fig. 7) . For example, if three audio files are currently stored in the multimedia database 4000, a set of the IDs of audio files 3320, the lengths of audio files 3330, the error detection codes of audio files 3340, the first names of audio files 3350 and the second names of audio files 3360 corresponds to each of the audio files. The first names of audio files 3350 represent the original names of audio files, while the second names of audio files 3360 are used to manage audio files that have contents identical with those of their original files but names different from those of their original files. The error detection codes of audio files 3340 are used to detect data transmission errors when the mobile multimedia terminal 1000 transmits/receives audio files to/from an external device, and to determine whether the contents of audio files are identical with each other in the process of compactly storing multimedia data. Preferably, the error detection codes of audio files 3340 can be Cyclic Redundancy Check (CRC) codes. Detailed descriptions of the usages of the second names 'of audio files 3360 and the error detection codes of audio files 3340 will be made when a process of compactly storing multimedia data is described below.
The image database table 3400 includes the number of images currently stored in the multimedia database 4000 and other information on these images. The architecture of the image database table 3400 is illustrated in Fig. 6C. The image database table 3400 has an architecture similar to that of the audio file table 3300, so a detailed description of the architecture is omitted.
The font database table 3500 includes the total number of fonts currently stored in the multimedia database 4000 and other information on these fonts. The architecture of the font database table 3500 is illustrated in Fig. 6D. The font database table 3500 includes the total number of fonts 3510 currently stored in the multimedia database, font names 3520, the numbers of fonts 3530 and font codes 3540. The font names 3520 represent the kinds of fonts such as "Courier New", "Times New Roman", etc. The numbers of fonts 3530 represent the numbers of fonts that are represented by the font names 3520,- respectively. For example, if the number of the currently used fonts of "Courier New" are 5, "5" is stored as the number of fonts 3530. The font codes 3540 can be an ASCII code, a Hangul (Korean character) code, a Chinese character code, etc., and the number of the font codes 3540 corresponds to the numbers of fonts 3530. A set of the font names 3520, the numbers of fonts 3530 and the font codes 40 is generated to correspond to one kind of font, and the total number of fonts 3510 is the sum of all of the numbers of fonts 3530.
The script data 3600 includes information on the playing order and contents of multimedia data. The multimedia script includes pages that are temporally connected to one another. Each of those pages includes information on multimedia data that are included in the page to be played. The architecture of the script data 3600 is illustrated in Fig. 6E . As described in Fig. 6E, the script data 3600 includes one or more page objects 3610. Each of the page objects 3610 includes a page ID 3611, a page length 3612, a previous page ID 3613, a next page ID 3614, one or more window objects 3620, one or more sound objects 3630, one or more text objects 3640, and one or more image objects 3650. The page ID 3611 is an identification number representing the page object 3610, the previous page ID 3613 is the ID of a page object that has been interpreted and played, and the next page ID 3614 is the ID of a page object that is to be interpreted and played. As occasion demands, the number of each of the window objects 3620, the sound objects 3630, the text objects 3640 and the image objects 3650 may be one or more.
Those objects will be described in detail in the following.
The window objects 3620 represent information on windows included in pages. Each of the window objects 3620 includes a window ID 3621, an upper left position coordinate 3622 and a lower right position coordinate 3623.
The sound objects 3630 represent information on sounds (voices, music, etc.) included in pages. Each of the sound objects 3630 includes a sound ID 3631, time information 3632 and an audio file ID 3633. In this case, the time information 3622 may include start times for playing sounds and finish times for playing sounds. The audio file IDs 3633 each coincide with one of the audio file IDs 3320 stored in the audio file table, and are used to search for audio files 4300 stored in the multimedia database 4000 when multimedia data are to be played.
The text objects 3640 represent information on texts (sentences, pictograph, etc.) included in pages, and each include a text ID 3641, time information 3642, a text position 3643, visual effect information of a text 3644 and a font database table index list 3645. The time information 3642 can include start times for displaying texts and finish times for displaying texts. The text position 3643 represents a position where the text is to be displayed, and may be X-Y coordinate information of the display screen of the mobile multimedia terminal 1000. The fort database table index list 3643 is the index list of the font database table 3500 included in a multimedia script file, and is used to search for font data 4100 stored in the multimedia database 4000 when multimedia data are to be played.
The image objects 3650 represent information on images (photographs, animation cells, moving picture frames, etc.) included in pages, and each include an image ID 3651, time information 3652, an image position 3653, visual effect information of an image 3654 and an image ID list 3655. The time information 3652 can be start times for displaying images and finish times for displaying images. The image position 3653 can be the X-Y coordinate information of the display screen of the mobile multimedia terminal 1000. The visual effect information 3654 of images can be special visual effects (blurring, inverting, smoothing, etc.) and the frame numbers and frame time values of moving pictures. The image ID list 3655 coincides with one of the image IDs 3410 stored in the image database table, and used to search for image data 4200 stored in the multimedia database 4000 when multimedia data are to be played.
Hereinafter, there is described a method of compactly storing and playing the multimedia script files 3000 and the multimedia database 4000 that are handled in the mobile multimedia terminal 1000 and have architectures described above .
A user or a multimedia contents provider may generate a multimedia script file 3000 and a multimedia database 4000 using a multimedia authoring tool program on an external device distinguished from the mobile multimedia terminal 1000. The multimedia script file 3000 and the multimedia database 4000 generated as described above can be transmitted to the mobile multimedia terminal 1000 through the data transmission/reception means 300 of the mobile multimedia terminal 1000. However, the multimedia file 3000 and the multimedia database 4000 may include multiple data each of which has identical contents with respect to each other, so there is required a method of compactly storing data so as to eliminate a data redundancy. Fig. 8 shows a process in which the multimedia script file 3000 and the multimedia database 4000 generated in the external device are transmitted to the mobile multimedia terminal 1000 and compactly stored therein. First, an audio file table 3300, an image database table 3400 and a font database table 3500 of a multimedia script file 3000 generated in an external device are transmitted to a mobile multimedia terminal 1000 (step 5100) . Thereafter, it is determined whether a multimedia database 4000 is previously stored in the mobile multimedia terminal 1000 (step 5200) .
If a multimedia database 4000 is not previously stored in the mobile multimedia terminal 1000, the multimedia script file 3000 and the multimedia database 4000 generated in the external device are transmitted to the mobile multimedia terminal 1000 and stored in a storage means 200 of the mobile multimedia terminal 1000 (step 5300) . However, if a multimedia database 4000 is previously stored in the mobile multimedia terminal 1000, redundancy tests for font data, audio files and image data are carried out (step 5400) .
The redundancy test for font data is carried out as follows. That is, this redundancy test is carried out in such a way as to compare font names 3520 and font codes 3540 included in the font database table transmitted from the external device and temporarily stored in the storage means 200 of the mobile multimedia terminal 1000 with those stored in the font database table included in the font database table list previously stored in the storage means 200 of the mobile multimedia terminal 1000, and to judge that the redundancy of font data is present if the former data coincide with the latter data.
Meanwhile, the redundancy test for audio files is carried out as follows. That is, this redundancy test is carried out in such a way as to compare the lengths of audio files 3330 and the error detection codes of audio files 3340 included in an audio file table transmitted from an external device and temporarily stored in the storage means 200 of the mobile multimedia terminal 1000 with those included in the audio find table included in the audio file table list previously stored in the storage means 200 of the mobile multimedia terminal 1000, and to judge that the redundancy of audio files is present if the former data coincide with the latter data. The redundancy test for image data is carried out in the same way as the redundancy test for audio files is carried out, i.e., by the comparison of the lengths of image data 3430 and the error detection codes of image data 3460. In the meantime, a process of determining the first and second file names 3350 and 3360 in the process of testing for the redundancy of audio files and compactly storing audio files is illustrated in Fig. 9.
While an audio file is stored in an external device 8000, the name of an audio file (e.g., "A.mp3") is stored in a first file name 6111 of an audio file table 6110 that includes information on the audio file. In this case, a second file name 6112 is stored as randomly chosen characters (e.g., "xxx.zzz"). If an audio file identical with the audio file ("A.mp3") is not found by the above- described redundancy test for audio files, a second file name 6212 included in a multimedia script file 6200 stored in the mobile multimedia terminal 1000 is set to the name of the audio file ("A.mp3") .
The above-described process is performed also when another multimedia script file 6400 stored in the external device 8000 is transmitted to the mobile multimedia terminal 1000. However, there can occur a case where audio files with identical contents are found by a redundancy test but a first file name 6411 ("B.mp3") is not identical with an audio file name 6310 ("A.mp3") included in an audio file table list 6300 stored in the mobile multimedia terminal 1000. In this case, when a multimedia script file 6500 is stored in the mobile multimedia terminal 1000, a second file name 6512 included in an audio file table 6510 is stored as an audio file name 6310 stored in the audio file table list 6300. That is, a first file name 6511 becomes an original audio file name ("B.mp3"), while the second file name 6512 is used to search for the audio file
("A.mp3") . In this way, audio files with identical contents are prevented from being redundantly stored.
If as the result of the redundancy test for audio files, audio files are found not to have identical contents but to have identical file names, it is necessary to change a file name to allow one audio file to be distinguished from the other audio file stored in the mobile multimedia terminal 1000. In. this case, when a multimedia script file 6700 is stored in the mobile multimedia terminal 1000, a new file name ("C.mp3") is stored as a second file name 6712 and added on to the audio file table list 6300 of the mobile multimedia terminal 1000. At this time, the audio file is stored in the multimedia database 4000 of the mobile multimedia terminal 1000 in the name of the new file name ("C.mp3") .
A process of testing for the redundancy of image data and compactly storing image data is the same as that for audio files, so a description of the process is omitted.
As illustrated in Fig. 8, after performing the redundancy tests for font data, audio files and image data and necessary steps depending on the results of the tests (steps 5400 and 5500), the audio file table 3300, the image database table 3400 and the font database table 3500 transmitted to the mobile multimedia terminal 1000 are added on to and stored in the audio file table list, the image database table list and the font database table list stored in the storage means 200 of the mobile multimedia terminal 1000, respectively (step 5600).
A process of playing the multimedia script file 3000 and the multimedia database 4000 stored in the mobile multimedia terminal 1000 is illustrated in Fig. 10.
First, a page object 3610 included in the multimedia script file 3000 is read (step 7100) .
Next, a window object 3620, a sound object 3630, a text object 3640 and an image object 3650 included in the page object 3610 are interpreted and outputted to the display means 700 and the audio input/output means 400 (step 7200) .
In the process of interpreting and playing the sound object 3630, an audio file 4300 stored in the multimedia database 4000 is searched for by using an audio file ID 3633 included in the sound object 3630. That is, audio file tables included in the multimedia script file are searched for an audio file table of an audio file ID identical with the audio file ID 3633 by using the audio file ID 3633, and audio files stored in the multimedia database by using the second file name of the audio file table. A similar process is carried out in the process of interpreting and playing the image object. Meanwhile, a font database table index list 3645 is included in the text object 3640. This is the index of a font database table included in the multimedia script file. The font database table included in the multimedia script file is searched for by using the font database table index, and font data stored in the multimedia database are searched for by using searched information included in the font database table.
After those objects are displayed on the display means 700, it is determined whether a next page object is present (step 7300) . It can be determined by using a next page ID 3614 included in the page object 3610 whether the next page object is present. If the next page object is not present, the process of playing the multimedia script file is terminated. If the next page object is present, the above-described process of interpreting and playing the page object (steps 7100 to 7300) is repeated.
As described above, the present invention provides a mobile multimedia terminal and a method for controlling same, wherein only one of redundant data is stored and only the pointers of multimedia data are searched for the playing of multimedia data, so that the storage means can be effectively utilized and rapid multimedia data search is enabled. Further, the mobile multimedia terminal of the present invention includes the user authentication means wherein a user authentication can be carried out by using the information stored in the user authentication means at a system initializing stage of the mobile multimedia terminal, thereby preventing the mobile multimedia terminal from being illegally reproduced. In addition, the user authentication means can be used as a means for preventing software from being illegally copied when the mobile multimedia terminal receives data such as multimedia contents or software from an external device through a communication network. While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims .

Claims

1. A mobile multimedia terminal for storing and playing multimedia data, comprising: a data transmission/reception means for controlling transmission/reception of multimedia data to/from an external device; a storage means including a first storage unit for storing multimedia data to be played and a second storage unit for temporarily storing multimedia data received from the external device through the data transmission/reception means; a control means for storing multimedia data of the second storage unit not identical with the multimedia data of the first storage unit in the first storage unit by performing a redundancy test in which lengths and error detection codes of the multimedia data of the first and second storage units are compared with each other, respectively; an audio input/output means for controlling input/output of audio data; a function key input means for directing a selection of multimedia data and an execution of a multimedia data playing program; and a display means for showing results of playing of multimedia data.
2. The mobile multimedia terminal of claim 1, wherein the multimedia data include: a multimedia script, which describes information relating to elements of multimedia contents and temporal and spatial relationships of the elements, including an audio file table having information on the audio files, an image database table having information on the image database, a font database table having information on the font database and script data having information on the playing order and contents of multimedia data; and a multimedia database having a font database, an image database and one or more audio files.
3. The mobile multimedia terminal of claim 2, wherein the script data includes one or more page objects each of which has one or more window objects representing information on shapes of windows to be outputted to the display means, one or more audio objects representing information on audio data to be outputted to the display means, one or more text objects representing information on character strings to be outputted to the display means, and one or more image objects representing information on images to be outputted to the display means.
4. The mobile multimedia terminal of claim 3, wherein: each of the window objects includes a window ID, a window position on a current page, and size information; each of the audio objects includes a sound ID, playing time information on a current page and information on audio files stored in the multimedia database; each of the text objects includes a text ID, a text attribute, playing time information on a current page and information on font data stored in the multimedia database; and each of the image objects includes an image ID, an image attribute, playing time information on a current page and information on image data stored in the multimedia database .
5. The mobile multimedia terminal of claim 1, further comprising a user authentication means that stores information for carrying out a user authentication when the mobile multimedia terminal is initialized, the user authentication means including: a first ROM in which an encoded hardware identification number is stored when the mobile multimedia terminal is manufactured; a second ROM in which a decoded hardware identification number is stored; and a means for comparing a decoded result obtained by decoding the encoded hardware identification number with the decoded hardware identification number, and stopping an operation of the mobile multimedia terminal if the decoded result coincides with the decoded hardware identification number.
6. The mobile multimedia terminal of claim 1, further comprising a user authentication means that stores information for carrying out a user authentication when the mobile multimedia terminal is initialized, the user authentication means including: a first ROM in which an encoded hardware identification number is stored when the mobile multimedia terminal is manufactured; a second ROM in which a decoded hardware identification number is stored; and a means for comparing a decoded result obtained by decoding an encoded hardware identification number received from an external device with the decoded hardware identification number, and stopping an operation of the mobile multimedia terminal if the decoded result coincides with the decoded hardware identification number.
7. A method for authenticating a hardware user of a mobile multimedia terminal having a user authentication means, comprising the steps of: inputting an encoded hardware identification number and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number with the decoded hardware identification number; and stopping an operation of the mobile multimedia terminal if the decoded result coincides with the decoded hardware identification number.
8. A method for authenticating a software user of a mobile multimedia terminal having a user authentication means, comprising the steps of: inputting an encoded hardware identification number received from an external device and a decoded hardware identification number stored in the user authentication means of the mobile multimedia terminal; comparing a decoded result obtained by decoding the encoded hardware identification number received from an external device with the decoded hardware identification number; and stopping a reception of data and/or a program from the external device if the decoded result coincides with the decoded hardware identification number.
9. A method for storing multimedia data including a multimedia script file and a multimedia database in a mobile multimedia terminal, comprising the steps of: transmitting a multimedia table included in a multimedia script file stored in an external device to the mobile multimedia terminal; testing for a redundancy of the multimedia database by comparing information on multimedia data included in the multimedia table with information on multimedia data included in a multimedia table list stored in the mobile multimedia terminal; adding to the multimedia table list a multimedia table that corresponds to multimedia data that are not redundant as the result of the testing; and transmitting the multimedia script file stored in the external device to the mobile multimedia terminal.
10. The method of claim 9, wherein the step of testing for redundancy of the multimedia database includes the step of: determining whether multimedia data are identical with each other by comparing a length and an error detection code of multimedia data included in the multimedia table with a length and an error detection code of multimedia data included in the multimedia table list.
11. The method of claim 9, wherein the step of transmitting the multimedia script file further includes the steps of: storing a first data name of the multimedia table included in the multimedia script file as a name of the multimedia data stored in the external device; storing a second data name of the multimedia table as a name of the multimedia data stored in the multimedia table list; and storing a name of a multimedia data stored in the multimedia table list as a name of a multimedia data stored in the mobile multimedia terminal.
12. A method for playing a multimedia script file and a multimedia database in a mobile multimedia terminal, comprising the steps of: interpreting a page object included in the multimedia script file; interpreting a multimedia data object included in the page object; outputting interpretation results of the multimedia data object to a display means or audio input/output means of the mobile multimedia terminal; determining whether a next page object is present in the multimedia script file; stopping playing the multimedia script file and the multimedia database if the next page object is not present; and repeating first four steps if the next page object is present.
13. The method of claim 12, wherein the step of interpreting the multimedia data object includes the steps of: searching a multimedia table included in the multimedia script file using a multimedia data ID included in the multimedia data object; and searching a multimedia data stored in the multimedia database using a second data name included in a multimedia table having a multimedia data ID identical with the multimedia data ID.
PCT/KR2002/001319 2001-07-14 2002-07-12 Mobile multimedia terminal and method for controlling same WO2003009154A1 (en)

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