WO2004095449A1 - 情報処理装置及び情報処理方法 - Google Patents
情報処理装置及び情報処理方法 Download PDFInfo
- Publication number
- WO2004095449A1 WO2004095449A1 PCT/JP2004/005017 JP2004005017W WO2004095449A1 WO 2004095449 A1 WO2004095449 A1 WO 2004095449A1 JP 2004005017 W JP2004005017 W JP 2004005017W WO 2004095449 A1 WO2004095449 A1 WO 2004095449A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- processing
- content
- time
- decryption
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/14—Protection against unauthorised use of memory or access to memory
-
- 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
- G06F21/60—Protecting data
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
Definitions
- the present invention relates to an information processing apparatus and a method for executing processing on unit data in which one content is treated as a unit of content.
- encryption is being used as an encoding method.
- Such encryption is generally performed for the purpose of copyright protection. That is, when reproducing the encrypted content data, a key for decryption is given only when the reproduction of the content data is permitted. Then, by performing decryption processing for encryption using this key, it becomes possible to reproduce and output.
- the content data encoded in this way includes, for example, a plurality of contexts.
- the contents may have continuity all night long. In such a case, simply playing back successive contents would result in a complete playback output for each content data, and would not provide continuity of playback output before and after the content data. . Therefore, Japanese Patent Application Laid-Open No. 2002-112123 discloses a technique for encoding content data which is arranged in the order of reproduction so as to maintain the continuity of the reproduction output. There is what is described in. As described above, even if the configuration of the encoding technology that gives continuity of the reproduction output between a plurality of content data is adopted, in the following situations, the reproduction output In some cases, continuity cannot be maintained.
- a configuration may be adopted in which the above-described decryption processing for encryption and compression encoding is executed as software processing. That is, the CPU or the like executes the processing according to the program for the decoding processing.
- the CPU executes another different process in parallel with the decoding process. May have to be done.
- decryption processing of AV content data is heavy processing in which the occupancy of CPU is assumed to be high. Then, it is assumed that even the processing that must be executed in parallel with the decoding processing is a heavy processing with a considerably high occupancy rate of CPU. In such a case, for example, a considerable load is applied to the CPU, and the decoding process may be delayed to such an extent that the continuity of the reproduction output cannot be maintained. In such a state, for example, even in the content data, a state in which the reproduction output is interrupted may occur.
- An object of the present invention is to provide a novel information processing device and information processing method that can solve the problems of the conventional technology.
- a specific object of the present invention is to provide information such that when a decoding process is executed under a condition that a CPU having a certain processing capacity is used, the occupation rate of the CPU becomes equal to or less than a certain value.
- An object of the present invention is to provide a processing device and an information processing method.
- An information processing apparatus proposed to achieve the object as described above relates to a decoding process for decoding encoded unit data, and a process related to the unit data executed prior to the decoding process.
- Processing means for performing at least pre-decoding processing; storage means for temporarily storing the decoded data obtained by the decoding processing; and reading out the decoded data stored in the storage means continuously for reproduction.
- Output means for outputting the data as output data overnight, wherein the processing means starts the decoding processing of the unit data after the completion of the pre-decoding process relating to the unit data.
- the information processing method includes a decoding pre-process related to the encoded unit data, a decoding process of decoding the unit data after the end of the pre-decoding process, and a decoding data obtained by the decoding process. It has an accumulation process for temporarily accumulating the evening, and an output process for continuously reading out the decoded data temporarily accumulated by the accumulation process and outputting the data as reproduction output data.
- FIG. 1 is a block diagram showing a configuration example of a recording / reproducing apparatus according to the present invention.
- FIG. 2 is a diagram showing a reproduction process of the encrypted content according to the present invention.
- FIG. 3 is a timing chart showing a general example of a processing sequence in the case of continuously reproducing encrypted content.
- FIG. 4 is a timing chart showing a processing sequence in the case of continuously playing back encrypted content to which the present invention is applied.
- FIG. 5 is a timing chart showing an example of a reproduction processing operation in the case of continuously reproducing encrypted content having a normal reproduction time by setting a normal buffer capacity.
- FIG. 6 is an evening timing chart showing an example of a playback processing operation in a case where encrypted content having a short playback time is continuously played back with a normal buffer capacity setting.
- FIG. 7 is a timing chart showing an example of a playback processing operation when continuously encrypting content having a short playback time by setting a short-time continuous playback buffer capacity.
- FIG. 8 is an explanatory diagram showing another example of the playback processing of the encrypted content according to the present invention.
- FIG. 9 is a timing chart showing a processing sequence in the case of continuously playing back encrypted content.
- FIG. 10 is a timing chart showing an example of a playback processing operation in the case where encrypted content is continuously played back including a fringe demodulation process with a processing time within a normal range by setting a normal buffer capacity.
- FIG. 11 is a timing chart showing an example of a playback processing operation in a case where encrypted content is continuously played back including a fringe demodulation process using a processing time outside the normal range by setting a normal buffer capacity.
- FIG. 12 is an evening timing chart showing an example of a playback processing operation in the case of continuously playing back encrypted content including a fringe demodulation process using a processing time outside the normal range by setting the buffer capacity for long-time processing.
- BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, an information processing apparatus to which the present invention is applied includes a CPU (CPU) that performs overall control and arithmetic processing of the recording / reproducing apparatus 1 based on a started program. Central Processing Unit) 1 1 1
- the CPU 11 performs, for example, a communication operation via a network, an input / output operation with respect to a user, content reproduction and ritving from media, It performs storage of content in HDD 21 and management for it.
- the CPU 11 exchanges control signals with the respective circuit units via the bus 12.
- the ROM 13 stores an operation program to be executed by the CPU 11, a program loader, various operation coefficients, parameters used in the program, and the like.
- a program to be executed by the CPU 11 is expanded. It is also used as a data area and a task area required when the CPU 11 executes various processes.
- an area as the buffer area 20a may be secured as one of such data areas and task areas.
- the buffer area 20a is, for example, an area for temporarily storing decoded content data when reproducing and outputting the media loaded in the media drive 19 or the content data read from the HDD 21 or the like. It is said.
- audio content data is used as content data that can be recorded and reproduced by the recording and reproducing device 1 according to the present invention.
- the operation input unit 15 is a part composed of operation keys provided on a casing of the recording / reproducing apparatus 1, various operators such as a jog dial and a touch panel. Note that a keyboard or mouse for GUI (Graphical User Interface) operation may be provided as the operation input unit 15. Further, the operation input unit 15 may be a remote controller.
- GUI Graphic User Interface
- the information input by the operation input unit 15 is subjected to predetermined processing in the input processing unit 14 and transmitted to the CPU 11 as an operation command.
- the CPU 11 performs necessary calculations and controls so as to obtain an operation as a device in response to the input operation command.
- a display device such as a liquid crystal display is connected, and various kinds of information are displayed.
- the display processing unit 16 executes a display operation on the display monitor 17 based on the supplied display data. Let it.
- the ripped audio file Depending on the program that manages the playback of audio files, a GUI screen for managing and playing audio files is displayed.
- the media drive 19 is a drive that can play at least a predetermined medium.
- a drive capable of recording as well as reproducing may be used according to a predetermined medium.
- the medium to which the media drive 19 is compatible is not particularly limited, but may be, for example, various optical disk-shaped recording media such as a CD, a DVD, and a mini disk.
- the medium may be configured by a memory element such as a flash memory.
- various drives corresponding to these various media may be individually provided and connected to the path 12.
- the CPU 11 instructs the media drive 19 to play back the media.
- the media drive 19 accesses the specified data from the loaded media and executes reading.
- the data read out in this way is audio content, it is decoded by the processing of the CPU 11 as necessary, and then sent to the audio input / output processing unit 24. Will be transferred.
- processing such as sound processing such as equalizing, volume adjustment, D / A conversion, amplification and the like are performed, and output from the speed controller 25.
- the data reproduced by the media drive 19 can be stored as an audio data file in the HDD 21 under the control of the CPU 11.
- an audio data file obtained by so-called ribbing can be stored as content.
- the format of the audio data file may be digital audio with 16-bit quantization at a sampling frequency of 44.1 KHz in the CD format, or the capacity of the HDD 21 may be reduced.
- the compression audio may be a format in which compression processing is performed according to a predetermined method. Also, although the compression method is not limited, an ATRAC (Adaptive Transform Acoustic Coding) method or an MP3 (MPEG Audio Layer III) method can be adopted.
- ATRAC Adaptive Transform Acoustic Coding
- MP3 MPEG Audio Layer III
- the tuner 27 is, for example, an AM / FM radio tuner, and demodulates a broadcast signal received by the antenna 26 under the control of the CPU 11.
- a tuner such as a TV tuner, a satellite broadcast tuner, or a digital broadcast tuner may be used.
- the demodulated broadcast audio signal is subjected to required processing in an audio data processing unit 24, and is output from a speaker 25 as broadcast audio.
- the communication processing unit 22 performs an encoding process on transmission data and a decoding process on reception data under the control of the CPU 11.
- the network interface 23 transmits the transmission data encoded by the communication processing unit 22 to a predetermined external network compatible device via a network. In addition, it passes the signal transmitted from the external network compatible device to the communication processing unit 22 via the network. The communication processing unit 22 transfers the received information to the CPU 11.
- the recording / reproducing device 1 is not limited to the one shown in FIG. 1, and various devices can be used.
- an interface with peripheral devices using a communication method such as Universal Serial Bus (USB), IEEE1394, or Bluetooth may be provided.
- USB Universal Serial Bus
- the audio content data downloaded over the network by the network interface 23 and the audio content data transferred via an interface such as USB or IEEE1394 are also stored in the HDD 21. Can be stored.
- a terminal used to connect a microphone or external headphones, a video output terminal corresponding to DVD playback, a line connection terminal, an optical digital connection terminal, or the like may be provided.
- a PCMC IA slot, a memory card slot, and the like may be formed so that data can be exchanged with an external information processing device or audio device.
- the recording / reproducing apparatus 1 can reproduce and output audio content data as audio. For example, if the content data is recorded on the medium loaded in the media drive 19, it is possible to reproduce and output the content data read from this medium. Also, the content data stored in the HDD 21 can be read out and reproduced and output.
- audio content is compressed and encoded by a predetermined compression encoding method and further encrypted by a predetermined encryption method (hereinafter, simply referred to as “audio content”). (Also called “encrypted content”).
- FIG. 2 shows a case where one encrypted content is reproduced and output.
- the HDD 21 stores the encrypted content to be reproduced.
- the playback processing of the encrypted content according to the present invention described below is performed, for example, when the encrypted content recorded on the medium is read out and played by the media drive 19, or when the encrypted content obtained via a network is encrypted.
- the present invention can be generally applied to the case where the encrypted content is reproduced by the recording / reproducing apparatus 1 according to the present invention, such as when reproducing the content.
- the encrypted content to be played back stored in the HDD 21 is subjected to a falsification check process for verifying whether or not any unauthorized falsification has been performed. You.
- This tampering check process is executed by the CPU 11 according to a program for playing back the encrypted content.
- the program for playing back the encrypted content is stored in such a manner that it is installed in the HDD 21.
- the program is read from the HDD 21 and expanded in the RAM 20. Will be.
- the encryption / decryption Z demodulation process is also executed by the CPU 11 in accordance with the program for playing back the encrypted content, and the data of the transferred encrypted content is encrypted for each predetermined processing data unit. Perform decryption processing. Then, demodulation processing (decompression processing) according to the compression encoding method is performed on the decrypted content data obtained by the decryption processing of the encryption. As a result, digital audio data after the decompression processing is obtained.
- the digital audio data obtained by the encryption / decryption Z demodulation process—the data sequence as the evening is transferred to the buffer formed by dividing the buffer area 20 sequentially by the buffer writing process. Writing is performed for this.
- the encryption / decryption / demodulation processing is processing for actually demodulating digital audio data by decrypting the encrypted content and performing decompression processing. In other words, it is a process for performing decoding for encryption and compression.
- the tampering check process is not a decryption process itself, but it is a process that must be performed prior to performing the decryption process.
- each of these buffers is configured as a ring buffer.
- the buffer writing process in such a case is executed as follows. Prior to the start of the encryption / decryption Z demodulation processing, buffers 1, 2, and 3 are all empty, but the encryption / decryption demodulation processing is started and data should be written to the buffer. When the timing comes, for example, data is first written to the buffer 1. Then, when it is assumed that the data accumulation amount in the buffer 1 is full, the data is subsequently written to the buffer 2, and if the data accumulation amount in the buffer 2 becomes full, Data is written to buffer 3. Note that writing data to the buffer is faster than reading data from the buffer. Done by the team. In addition, the data written and accumulated in the buffers 1, 2, and 3 in this manner usually has continuity on the time axis.
- buffer reading process if it is assumed that all the data stored in buffer 1 has been read, then the data stored in buffer 2 is read, and then stored in buffer 2. If all the read data has been read, the data is read from buffer 3.
- the writing process for buffers 1, 2, and 3 is repeated in the order of buffers 1, 2, and 3, and data is written to the empty buffer at a predetermined data rate.
- the read processing for buffers 1, 2, and 3 is performed in the order of buffers 1, 2, and 3 by delaying the time corresponding to the accumulation of a certain amount or more of data by the buffer write processing. Reading is performed at a lower data rate than writing.
- the buffer writing process includes a process for all buffers.
- the system waits for data writing, and starts writing data when the buffer to be written in the writing order becomes empty. That is, at least the buffer write processing may be an intermittent operation.
- the reproduction / output transfer processing is started in synchronization with the start of reading data from the buffer.
- the reproduction output system transfer processing is also executed by the CPU 11 in accordance with a program for reproducing the encrypted content.
- the data read from the buffer is reproduced by the reproduction signal processing system (reproduction) for reproduction output. This is the process for transferring to the output system.
- the reproduced signal processing system (reproduced output system) is the high-speed data processing unit 24 in the apparatus shown in FIG.
- the reproduction output system transfer processing the data read from the buffer is read at a required data rate so that the continuity of the audio data to be reproduced and output in the audio data processing section 24 is guaranteed. The transfer is performed via the bus 12.
- the buffer writing process is a process of writing digital audio data obtained by the encryption / decryption demodulation process to the buffer, and the data read by the buffer reading process is converted into audio data by the reproduction output system transfer process. It is transferred to the processing section 24. Therefore, there is a period in which the encryption / decryption Z demodulation process and the reproduction output system transfer process are performed simultaneously.
- the digital audio data read from the buffer as described above is continuously input.
- the digital audio data thus input is subjected to predetermined signal processing including DZA conversion processing, so that the digital audio data is finally output as audio from the speaker 25.
- predetermined signal processing including DZA conversion processing
- continuity can be obtained as the audio of the content output from the speaker 25.
- the CPU 11 executes the program for reproducing the encrypted content. Therefore, the basic processing (encrypted content-compatible playback processing) to be executed is a tampering check processing.
- the tampering check process checks the authenticity of the data content based on the presence or absence of data tampering, so it must be executed before the encryption / decryption / demodulation process. It becomes. In other words, when only one content is targeted, the falsification check process and the encryption / decryption Z demodulation process are not performed simultaneously, and the falsification check process—the order of execution of the encryption / decryption / demodulation process must be observed. It becomes. However, the encryption / decryption / demodulation processing and the reproduction / output system transfer processing may be simultaneously executed as described above.
- the writing process to the buffer in the buffer area 20a shall be associated with the encryption / decryption / demodulation process, and the reading process shall be associated with the reproduction output system transfer process.
- the reproduction process corresponding to the encrypted content may be, for example, generally the execution timing shown in the timing chart of FIG.
- a tampering check process for the content A is executed.
- the time required for the tampering check processing is substantially constant regardless of the content of the encoded content and the like. However, depending on the encryption method, etc., the time required for the falsification check processing may vary for each content.
- the encryption / decryption / demodulation processing of the content A is started from the time t2. Is done.
- the operation of accumulating the digital audio data obtained by the demodulation process in the buffer of the buffer area 20a is also started. After a certain period of time, the storage capacity of the buffer becomes equal to or greater than a certain value, and the buffer becomes readable. This timing is shown as time t3.
- the reproduction output system transfer processing for the content A is started from the time point t3. That is, the digital audio data read from the buffer is transferred to the audio data processing unit 2 which is a reproduction output system.
- the output of the playback sound as the content A is started in response to the time t3.
- the encryption / decryption / demodulation processing for the encoded data as content A is completed at time t5.
- the writing of the content A obtained by the encryption / decryption Z demodulation processing to the digital audio overnight buffer is also completed, but at this time, the buffer is still read. It is in a state where digital audio data has not been accumulated.
- the reproduction output system transfer processing of the content A is continued until all data stored in the buffer is read.
- the reproduction output system transfer processing for the content A has been completed, and accordingly, the reproduction output sound as the content A has also been completed at time t7. It is assumed that. From this, the playback output period during which the content A is played back is the period from time t3 to time t7.
- the playback processing corresponding to the encrypted content for the content B to be played next to the content A is executed as follows.
- the start timing of the playback output system transfer process for the content B needs to be continuous with the end timing of the playback output system transfer process for the content A. That is, in this case, as shown in the figure, it is necessary to start the reproduction output system transfer processing for the content B from time t7. For this reason, the encryption / decryption / demodulation processing for the content B is performed using the time t7 as a base point in order to guarantee that the reading processing from the buffer from the time t7 is started. It should be started from the time point t6 at the timing before the time required for storing the predetermined amount of digital audio data.
- the falsification check processing of the content B is executed after the falsification check processing of the content A ends.
- the tampering check process for the content A has been completed at the time t2
- the tampering check process for the content B is to be started at the time t2.
- the tampering check processing of the content B is completed at time t4.
- the tampering check processing, the encryption / decryption / demodulation processing, and the reproduction / output system transfer processing include the tampering check processing and the encryption / decryption Z demodulation processing as the actual processing of the encrypted content compatible playback processing Is that each process is a heavy process with a relatively high CPU 11 occupancy.
- the reproduction output system transfer processing only the instruction to transfer the digital audio data read from the buffer via the bus 12 is given, so that the light processing in which the occupancy rate of the CPU 11 is low is small. Become.
- a program of another application may be executed in addition to the reproduction of the encrypted content.
- the recording / reproducing device 1 of the present embodiment has a network connection function, an application such as a Web browser or a mailer for sending and receiving e-mails using this function can be used. By installing them on the HDD 21, these applications can be started and executed as needed.
- the CPU occupancy rate is high as shown in periods t2 to t4 in FIG. If a state occurs, in this case, there is a high possibility that the reproduction output sound is interrupted as described above. Or, conversely, the operation of other application programs may become heavy and slow.
- the processing sequence of the playback processing corresponding to the encrypted content is executed. Note that, in the processing sequence shown in FIG. 4, as an example, a case where reproduction is started from the content A and then the content B is continuously reproduced as the encrypted content will be described. .
- the timings of the tampering check processing, the encryption / decryption / demodulation processing, and the reproduction / output transfer processing for the content A are the same as those in FIG.
- the timing of the encryption / decryption / demodulation processing for the content B and the transfer processing for the playback output system are the same as those in Fig. 3 because continuous playback following the content A is required. .
- the tampering check process is started at time t5, which is the end of the encryption / decryption / demodulation process for content A.
- the program is designed so that the tampering check processing for the content to be reproduced next is executed following the encryption / decryption / demodulation processing for the content currently being reproduced / output. It constitutes the algorithm.
- the tampering check process for the content B in such a processing sequence is performed by the reproduction / output system transfer process for the same content A after the encryption / decryption Z demodulation process for the content A is completed. It is executed using the period during which the digital audio data stored in the buffer is read out and reproduced and output.
- the tampering check processing of the content B target is completed at time t6 when the decoding / demodulation processing of the content B target is started. This indicates that the tampering check process should be completed at the latest at time t6. For example, in actuality, the processing may be terminated at a time before the start of the encryption / decryption / demodulation processing for the content B.
- the execution timing of the falsification check processing for the next content to be reproduced next is performed by the encryption / decryption / demodulation processing. It uses the operation of temporarily storing digital audio data in a buffer.
- the period until the encryption / decryption / demodulation processing for the content is started is a period in which the digital audio data stored in the buffer is read out and reproduced and output.
- This period is a period in which only the playback output system transfer process for the current content is executed as the encrypted content corresponding playback process for the current content, and the encryption / decryption Z demodulation process is not executed.
- the falsification check process for the next content is to be executed.
- a buffer must be set after the end of the encryption / decryption / demodulation process for the current content. It is only necessary that the time length from the reading of the digital audio data stored in the memory to the end of the reproduction output be longer than the time required for the falsification check processing.
- encryption / decryption / demodulation processing starts after falsification checking processing, and playback / output transfer processing including buffer reading processing starts after a certain amount of data is accumulated in the buffer. It starts as it is done. In other words, during a period until data equal to or more than a predetermined amount is accumulated in the buffer, a standby period in which reproduction is not started occurs.
- the start of data reading from the buffer corresponding to the start of content reproduction is performed, for example, when the three buffers of buffers 1, 2, and 3 are provided, the first buffer 1
- the capacity of buffers 1, 2, and 3 will increase the amount of storage, but it will also increase the waiting time until playback starts, which is not desirable in this regard.
- FIG. 5 shows that, among the encrypted contents A and B that are continuously reproduced, at least the reproduction time of the content A that is to be reproduced first is considered to be a normal length.
- the case where B is continuously reproduced is shown.
- the portions indicated by white bars in the buffers 1, 2, and 3 indicate periods during which the read is being executed.
- the portions shown as black bars in buffers 1, 2, and 3 indicate the period during which writing is being performed.
- a tampering check process for the content A is executed in the period from the time point t1 to the time point t2, and an encryption / decryption / demodulation process for the content A is started from the time point 2 onward.
- writing to the buffer 1 is performed. This writing to buffer 1 has been completed at time t3.
- the writing to the buffers 2 and 3 is performed sequentially, and the writing is repeated by returning to the buffer 1 and repeating the writing.
- the reproduction output transfer processing for the content is started from the time t3, At the same time t3, the reading process for the buffer 1 is executed.
- the buffer reading process the buffer 2 and 3 in which data is already stored are sequentially read, and the process returns to the buffer 1 to execute reading.
- the writing speed for the buffer is higher than the reading speed. Therefore, depending on whether writing / reading to / from a buffer is performed normally, for example, when reading from / to a certain buffer is being executed, data may be stored almost constantly in another buffer. Will be obtained.
- the encryption / decryption / demodulation processing for the content A is completed, and the writing of the digital audio data as the content A to the buffer is performed, for example, by writing to the buffer 3.
- the writing of the digital audio data as the content A to the buffer is performed, for example, by writing to the buffer 3.
- it has been completed.
- a state in which data was accumulated in buffers 2 and 3 after time t4 had elapsed. become. Therefore, depending on the reproduction output system transfer processing after time t4, first, the data read from buffer 2 is transferred and reproduced and output, and then the data read from buffer 3 is transferred and reproduced and output. become.
- the tampering check process according to the present embodiment has a processing time longer than the unit playback time T s corresponding to one buffer storage capacity but shorter than the unit playback time T s X 2.
- the tampering check process for the content B is performed in the unit playback time T s
- the process ends at time t5 in the period from time t4 to time t6 corresponding to X2.
- the reproduction output system transfer for the content B is performed from the time t6 when the reproduction period of the content A ends. Processing is starting. In other words, it can be seen that the sound reproduction of the content B is started from the time point t6, whereby the continuous reproduction operation of the content A and B is obtained.
- the playback process shown in Fig. 6 is performed. There is. Also in this case, first, a tampering check process for the content A is executed in the period t1 to t2. Following this, the encryption / decryption / demodulation processing for the content A is started from the time point t2. However, in this case, it is assumed that the time required for the encryption / decryption / demodulation processing for the content A is completed in a relatively short time in response to the short playback time of the content A.
- the execution period of the encryption / decryption / demodulation process is also very short.
- the buffer writing process during the execution period of the encryption / decryption / demodulation process is performed.
- the difference between the amount of data stored and the amount of data read and consumed by the reading process is not sufficiently obtained.
- the time that can be earned by the reproduction output transfer processing for the content A after time t4 is the unit time Ts corresponding to the data accumulated in the buffer 3.
- the reproduction / output transfer processing of the content A target after the time point t4 ends at the time point t4a, which is almost unit time Ts after the time point t4, and according to this time point, However, the playback sound output of the content A is also stopped.
- the tampering check process is a process longer than the unit time T s, the tampering check process of the content B target started at the time point t4 is executed even after the time point t4a. And ends, for example, at time t5.
- the encryption / decryption / demodulation processing for the content B is started from this time t5, and from this time t5, for example, the time when it is assumed that the data writing to the buffer 1 is almost completed
- the playback / output system transfer processing for the content B is started, and the audio output of the content B is also started.
- a non-playback period (t) is provided between the time point t4a at which the output of the playback sound of the content A ends and the time point t6 at which the output of the playback sound of the content B starts. 4 a to t 6). In other words, content A and B cannot be played continuously.
- the user when performing the link editing, the user is asked to confirm whether the connection state between the end position and the start position of the content before and after the content specified as the link is to be connected is intended by the user.
- the continuous playback is repeated by extracting only a few seconds each of the end and start parts of the content.
- connection status In order to be able to confirm that the connection status is appropriate during connection editing, the end and start portions of the preceding and following content must be reliably and continuously played back.
- the encrypted content to be reproduced first is to be reproduced as the encrypted content to be continuously reproduced. If the interval is less than or equal to the predetermined value and continuous playback cannot be guaranteed with the normal buffer capacity setting, the required buffer capacity that is assumed to be larger than normal (hereinafter referred to as “buffer capacity for short-time continuous playback”) ) Is set.
- Such a change in the setting of the buffer capacity can be realized by changing the setting of each area of the buffers 1, 2, and 3 in the buffer area 20a in the RAM 20 under the control of the CPU 11.
- the area allocation for the capacity A is performed for each of the buffers 1, 2, and 3. , 3 are allocated to a predetermined capacity B larger than the capacity A.
- the timing chart of FIG. 7 shows an operation in the case where the buffer capacity for short-time continuous reproduction is set and the content B is reproduced following the content A having a short reproduction time, as in the case of FIG.
- the encryption / decryption / demodulation processing is started from time point t2 following the tampering check processing of the content A target in the period t1 to t2. Then, with the encryption / decryption / demodulation processing, writing is started from the buffer 1 at the same time t2 and thereafter.
- the capacity of each of the buffers 1, 2, and 3 is set larger than usual, it can be seen that the time required to complete the writing to the buffer 1 is longer.
- the time length from the time point t2 to the time point t3 at which the reproduction output system transfer process of the content A is started is actually longer than the time periods t2 to t3 shown in FIG. Have been. In other words, the standby time until the sound actually starts to be output when the reproduction is started becomes longer.
- the data is stored only in the buffer 3 among the buffers 1, 2, and 3.
- the state is shown. Therefore, after time t4, an operation of reading out the data stored in the buffer 3 and reproducing and outputting the data is performed in accordance with the reproduction output system transfer processing of the content A. Then, this operation is executed by the period length of the reproduction time TL corresponding to the capacity of the buffer 3.
- the unit playback time TL corresponds to the buffer capacity for short-time continuous playback, it must be longer than the unit playback time T s corresponding to the normal buffer capacity. I have.
- the time required for the tampering check process is almost constant regardless of the content playback time.
- the tampering check process for the content B target executed from the time point t4 ends at the time point t5 when a substantially same time length as in the case of FIG. 6 has elapsed.
- the time point t5 is a time point before the time point t6 at which the operation of reading out the data accumulated in the buffer 3 and reproducing and outputting the data ends, as shown in the figure. That is, in this case, while the digital audio data of the content A is being reproduced and output, the falsification check processing for the content B is completed.
- the audio reproduction output of the content A is terminated at the time t6 after a certain time has elapsed from the time t5.
- the playback output transfer processing for the content B is started properly. That is, the sound reproduction output of the content A is started. In this way, by setting the required buffer capacity larger than usual, it is understood that audio continuity is maintained even when performing continuous playback including encrypted content with a short playback time. Is done.
- a normal buffer capacity is set in response to a normal operation.
- the playback time length of the encrypted content is longer than a certain value. Therefore, the continuity can be maintained as described with reference to FIG.
- the buffer capacity at this time is set in consideration of the fact that the standby time until the actual start of audio reproduction at the start of reproduction is also within the allowable range, so that in normal use conditions, However, they do not feel uncomfortable during the waiting time.
- the playback of the linked position in the linked editing described above and the continuous playback of the encrypted content following the very short playback time of the encrypted content with a playback time shorter than a certain value are considered.
- the buffer capacity is switched to the buffer capacity for short-time continuous reproduction. As a result, as shown in FIG. 7, continuity can be ensured even when playing back encrypted content having a short playback time.
- fringe data related data other than audio data
- fringe data include, for example, image data as an album jacket for the corresponding encrypted content, artist's profile, linano's data, lyrics, etc.
- image data to be displayed or text data can be cited.
- Such fringe data is managed in association with the encrypted content as audio data, and is stored as a separate file from the encrypted content file as the audio data. Is what it is.
- a plurality of such fringe data may be associated with one encrypted content, for example, album jacket data, lyrics data, or the like.
- the fringe data is in a format compressed by a predetermined image compression method, and is also encrypted.
- the fringe data is decoded along with the playback of the encrypted content, when the encrypted content is played back and output as a sound, the image of the album jacket, lyrics, etc. can be displayed on the display monitor 1. It becomes possible to output the display on 7.
- FIG. 8 shows a case where one encrypted content is reproduced and output. Also, here is the theory For the sake of simplicity, the encrypted content to be played is stored in the HDD 21.
- the playback processing of the encrypted content according to the present embodiment described below is performed, for example, when the encrypted content recorded on the medium is read out and played by the media drive 19, or when the encrypted content obtained via a network is encrypted.
- the present invention can be generally applied to the case where the encrypted content is reproduced by the recording / reproducing apparatus 1 shown in FIG. 1 according to the present invention, such as when reproducing the content.
- This fringe demodulation processing is executed by the CPU 11 in accordance with a program for reproducing the encrypted content.
- the fringe demodulation processing is performed not by hardware but by software.
- the program for playing back the encrypted content is stored in such a manner as to be installed in the HDD 21, and when this program is to be executed, the program is read from the HDD 21 and expanded in the RAM 20. .
- the HDD 21 is instructed to read the target fringe data overnight.
- fringe data is read from HDD 21 and transferred to CPU 12 via path 12.
- the CPU 12 first executes a process for encryption / decryption of the transferred data using the RAM 20 as a work area. Since the deciphered fringe data is in the form of, for example, a compression-encoded image, a decompression process corresponding to the compression-encoding is performed.
- the fringe data thus demodulated is stored in, for example, the RAM 20.
- the display output of the fringe data is to be performed simultaneously with the start of the audio reproduction of the encrypted content, for example.
- the decoding processing of Fringe Data is relatively heavy processing for the CPU 11, even if it is executed simultaneously with the encryption / decryption / demodulation processing of the encrypted content, this decrypted encryption Be in time for the start of the audio playback output of the content Is difficult.
- the fringe image is decoded before decoding the encrypted content.
- the fringe data in order to display the fringe data, for example, it is only necessary to transfer the fringe data to the display processing unit 16. Therefore, if the fringe data after decoding is transferred to the display processing unit 16 in synchronization with the audio playback output timing of the encrypted content, the fringe data can be displayed and output simultaneously with the start of the audio playback output of the encrypted content. Becomes possible.
- the encryption / decryption / demodulation processing is also executed by the CPU 11 in accordance with a program for playing back the encrypted content, and the data of the transferred encrypted content is encrypted for each predetermined processing data unit. Perform decryption processing. Then, demodulation processing (decompression processing) according to the compression encoding method is performed on the decrypted content data obtained by the decryption processing of the encryption. As a result, digital audio data after the decompression processing is obtained.
- the data stream as the digital audio data obtained by the encryption / decryption / demodulation processing is sequentially transferred to the buffer formed by dividing the buffer area 20a by the buffer writing processing. Writing is performed.
- the encryption / decryption / demodulation process is a process of actually decrypting the encrypted content and performing a decompression process to demodulate digital audio data.
- it is a process of performing decoding for encryption and compression.
- the fringe demodulation process is a process for demodulating information that is not itself content data as audio, but is additionally required to reproduce and output the content data. That means there is.
- a plurality of buffers 7 are provided in the buffer area 20a.
- an example having three buffers 1, 2, and 3 is shown. Also, here It is assumed that the same data capacity is assigned to each of the plurality of buffers. In practice, each of these buffers is configured as a ring buffer.
- the buffer writing process in such a case is executed as follows.
- buffers 1, 2 and 3 Prior to the start of encryption / decryption / demodulation processing, buffers 1, 2 and 3 are all empty, but the timing at which encryption / decryption / demodulation processing is started and data must be written to the buffer Then, for example, first, data is written to buffer 1 first. Then, if it is assumed that the amount of data stored in buffer 1 is full, then data is written to buffer 2 and then the amount of data stored in buffer 2 becomes full. For example, data is written to buffer 3. It should be noted that, for confirmation, writing data to the buffer is performed at a faster rate than reading data from the buffer. In addition, the data written and accumulated in the buffers 1, 2, and 3 in this manner usually has continuity on the time axis.
- buffer write process As a buffer write process, after writing to buffer 3 is completed, return to buffer 1, which has been completed as a result of reading data as described above and becomes empty, and perform writing. Let go. Thereafter, similarly, data is sequentially written to the empty buffers 2 and 3 after reading is completed. In other words, the write processing for the buffers 1, 2, and 3 is repeated in the order of the buffers 1, 2, and 3 so that data is written to the empty buffer at a predetermined data rate. Is done.
- the read processing for buffers 1, 2, and 3 is delayed by the time corresponding to the accumulation of a certain amount or more of data by the buffer write processing, and buffers 1, 2, and 3 are sequentially processed. Reading is performed at a lower data rate than writing.
- the buffer write process involves waiting for data write when data is accumulated in all buffers, and emptying buffers to be written in write order. Then, it starts to write data. That is, at least the buffer writing process may be an intermittent operation.
- the reproduction output system transfer processing is started in synchronization with the start of reading data from the buffer.
- the reproduction output system transfer processing is also executed by the CPU 11 in accordance with a program for reproducing the encrypted content.
- the data read from the buffer is reproduced by the reproduction signal processing system (reproduction) for reproduction output. This is the process for transferring to the output system.
- the reproduction signal processing system (reproduction output system) is the audio data processing unit 24 in FIG.
- the reproduction output system transfer processing the data read from the buffer at a required data rate is transferred via the bus 12 at a required data rate so that the repetitiveness of the audio data to be reproduced and output in the audio data processing section 24 is guaranteed. It will be transferred.
- the buffer write process is a process of writing digital audio data obtained by the decoding / demodulation process to the buffer, and is a process of reading the buffer by the buffer read process.
- the extracted data is transferred to the audio data processing unit 24 by a reproduction output system transfer process. Therefore, there is a period during which the encryption / decryption / demodulation processing and the reproduction / output transfer processing are performed simultaneously.
- the digital data read from the buffer as described above is continuously input. Then, by performing predetermined signal processing including D / A conversion processing on the digital audio data thus input, the digital audio data is finally output as audio from the speaker 25. .
- predetermined signal processing including D / A conversion processing on the digital audio data thus input, the digital audio data is finally output as audio from the speaker 25.
- continuity can be obtained as the audio of the content output from the speaker 25.
- the data transfer processing to the display processing section 16 for reproducing and outputting (display output) the fringe data demodulated by the fringe demodulation processing is performed by the above-described reproduction for audio data. It may be executed at the same time as the start transfer which is almost simultaneous with the output transfer processing.
- the basic processing includes fringe demodulation processing (including transfer processing for display output)
- the fringe demodulation process is a process for demodulating fringe data typified by, for example, an image of an album jacket corresponding to the content.
- reproduction and output of audio as the content are started.
- the fringe data will be decoded so that it can be played back and displayed. Therefore, the fringe demodulation processing in this case must be executed in a stage prior to the encryption / decryption / demodulation processing.
- the fringe demodulation process and the encryption / decryption demodulation process are not performed at the same time, and the order of execution of the fringe demodulation process ⁇ the encryption / decryption demodulation process should be observed. Become.
- encryption / decryption demodulation processing and playback output may be performed simultaneously and concurrently.
- the writing process to the buffer in the buffer area 20a is associated with the encryption / decryption / demodulation process, and the reading process is associated with the reproduction / output system transfer process.
- the time required for the fringe demodulation processing differs depending on the fringe data to be demodulated.
- the image size and resolution of the fringe image in the present embodiment are not particularly unified.
- the time required for the demodulation processing for individual fringe data varies depending on the image size, resolution, and the like.
- the number of fringe data associated with one encrypted content is described above as having multiple values, the number of fringe data to be associated with one content is not particularly specified. Therefore, the number of files as an attached fringe image differs for each encrypted content. Therefore, the length of time required for fringe demodulation varies depending on the number of fringe demodulations to be demodulated.
- the digital audio data obtained by the demodulation process is transferred to the buffer in the buffer area 20a in response to the start of the decryption / demodulation process for the content A target.
- the operation of accumulating data in the buffer is also started, and after a lapse of a certain period of time, the storage capacity of the buffer becomes a certain value or more, and the buffer becomes readable. This timing is shown as time t3.
- the reproduction output system transfer processing for the content A is started from the time point t3.
- the digital audio data read from the buffer is transferred to the audio data processing unit 24, which is a reproduction output system.
- the output of the playback sound as the content A is started in response to the time t3.
- the encryption / decryption / demodulation processing for the encoded data as the content A is completed at time t4.
- the writing of the content A obtained by the encryption / decryption / demodulation processing to the digital audio buffer is also completed, but at this time, the buffer has not yet been read. There is no digital audio data stored.
- the reproduction output system transfer processing for the content A is continued until all the data stored in the buffer is read.
- the reproduction output system transfer processing for the content A has been completed, and accordingly, the reproduction output sound as the content A has also been completed at time t6. It is assumed that. From this, the playback output period during which the content A is played back is output from the time point t3 to the time point t6.
- the playback processing corresponding to the encrypted content for the content B to be played next to the content A is executed as follows.
- the start timing of the playback output system transfer processing for the content B needs to be continuous with the end timing of the playback output system transfer processing for the content A.
- the encryption / decryption demodulation processing for the content B is performed with a predetermined amount of digital data starting at time t6 to assure that the reading processing from the buffer from time t6 is started. It should be started from the time t5 at the evening of 'time required for accumulation of Diode overnight'. Therefore, the fringe demodulation processing for the content B needs to be executed at a stage before this time t5.
- the fringe demodulation processing for the content B is executed after the encryption / decryption / demodulation processing of the content A is completed. I have to.
- the encryption / decryption / demodulation processing of the content A is completed at the time t4, but the fringe demodulation processing for the content B is to be started at the time t4. .
- This fringe demodulation processing of the content B should be completed by the time t4 when the encryption / decryption / demodulation processing of the content B is started.
- the timing of starting the execution of the fringe demodulation processing for the content B may be, for example, immediately after the end of the fringe demodulation processing for the content A. That is, as shown in the fringe demodulation processing enclosed by the broken line in FIG. 9, the processing is started at time t2.
- the fringe demodulation process is to execute the fringe demodulation process for the encrypted content to be reproduced next to the fringe demodulation process for the encrypted content currently being reproduced. I have. Even at such processing timing of the fringe demodulation processing, the fringe demodulation processing can be completed before the encryption / decryption / demodulation processing of the encrypted content.
- the fringe demodulation process, the encryption / decryption / demodulation process, and the playback / output-system transfer process among the fringe demodulation process and the encryption / decryption / demodulation process in the encrypted content-based playback process are actually performed. Is that each process is a heavy process with a relatively high CPU 11 occupancy. On the other hand, in the reproduction output system transfer processing, only the instruction to transfer the digital audio data read from the buffer via the bus 12 is given, so that the light processing in which the occupancy rate of the CPU 11 is low is small. Become.
- the time t 2 In the following, encryption for content A A period occurs in which the decoding / decoding Z demodulation process and the fringe demodulation process for the content B are simultaneously executed. During this period, the CPU 11 is simultaneously executing two processes that are considered to have a high CPU occupancy, and the actual CPU occupancy is considerably high.
- the recording / reproducing apparatus 1 used in the present invention for example, a program of another application may be executed in addition to the reproduction of the encrypted content.
- a program of another application may be executed in addition to the reproduction of the encrypted content.
- the recording / reproducing apparatus 1 of the present embodiment has a network connection function, it is possible to use this function, for example, a Web browser, a mail transmission / reception mailer, or the like. By installing these applications on the HDD 21, these applications can be started and executed as needed.
- the CPU occupancy rate is high as shown in periods t2 to t4 in FIG. If a state occurs, in this case, there is a high possibility that the reproduction output sound is interrupted as described above. Or, conversely, the operation of other application programs may become heavy and slow.
- the fringe demodulation processing for content B is started at time t4, which is the end of the encryption / decryption Z demodulation processing for content A.
- the free content targeted for the next content to be reproduced is set.
- the algorithm of the program is configured to be executed following the encryption / decryption / demodulation process for the content currently being reproduced and output.
- the fringe demodulation processing for the content B by such a processing sequence is performed by the reproduction output system transfer processing for the same content A after the encryption / decryption Z demodulation processing for the content A is completed. It is executed using the period during which the digital audio data stored in the buffer is read out and reproduced and output.
- the fringe demodulation processing for the content B is completed at time t5 when the encryption / decryption / demodulation processing for the content B is started. Indicates that the fringe demodulation processing for the content B should be completed at the latest at time t5. For example, in actuality, the processing may be ended at a time before the start of the encryption / decryption / demodulation processing for the content B.
- the setting of the execution timing of the fringe demodulation processing for the next content to be reproduced next is based on the digital audio data subjected to the encryption / decryption / demodulation processing. This is possible on the premise that the operation of temporarily storing one night in a buffer is performed.
- the period from the end of the encryption / decryption of the current content being played back to the end of the encryption / decryption processing for the next content until the start of the encryption / decryption demodulation process for the next content Read audio data and play back and output Period.
- This period is a period in which only the playback output system transfer process for the current content is executed as the encrypted content corresponding playback process for the current content, and the encryption / decryption / demodulation process is not executed. However, fringe demodulation processing for the next content is to be executed.
- a buffer must be set after the end of the encryption / decryption / demodulation processing of the current content.
- the time required for reading the digital audio data stored in the memory and ending the reproduction output need only be longer than the time required for the fringe demodulation processing.
- the capacity of each buffer in the buffer area 20a is set.
- the audio reproduction of the encrypted content starts with the encryption / decryption / demodulation processing after the fringe demodulation processing, and after a certain amount or more of data is accumulated in the buffer, the buffer is read out. It starts in response to the start of the playback output system transfer process including the process. In other words, during a period until a predetermined amount of data is accumulated in the buffer, a standby period in which reproduction is not started occurs.
- the start of data reading from the buffer corresponding to the start of content reproduction is started, for example, when three buffers, ie, buffers 1, 2, and 3, are provided.
- three buffers ie, buffers 1, 2, and 3
- the capacity of the buffers 1, 2, and 3 is increased, the accumulated amount is also increased, but the waiting time until the start of playback is also increased, which is not preferable in this respect.
- the length of time required for fringe demodulation may exceed the normal range, depending on the content and number of fringe images.
- the capacity of the normal buffers 1, 2, and 3 cannot guarantee the former condition, and the continuity of the playback output between the current content and the next content cannot be maintained.
- Fig. 10 shows that when the encrypted contents A and B are played continuously, the processing time is considered to be normal, at least for the fringe data of the content B to be played next to the content A. This is the length, indicating that the content A and B are properly played back continuously.
- the portions indicated by white bars in the buffers 1, 2, and 3 indicate the periods during which the read is being executed.
- the portions shown as black bars in buffers 1> 2, 3 indicate the period during which writing is being performed.
- the fringe demodulation processing for the content A is executed in the period from the time point t1 to the time point t2, and the encryption / decryption / demodulation processing for the content A is started from the time point t2. ing.
- writing to the buffer 1 is performed.
- the writing to the buffer 1 is completed at the time point t3.
- the writing is executed sequentially to the buffers 2 and 3, and the writing is repeated by returning to the buffer 1 and the writing is repeated. .
- the reproduction output system transfer processing for the content A is started from the time t3. Is read out. Buffer reading As processing, reading is performed sequentially on buffers 2 and 3 in which data has already been stored, and the process returns to buffer 1 to perform reading.
- the writing speed for the buffer is higher than the reading speed. Therefore, depending on whether the writing / reading to the buffer is performed normally, for example, when reading from / to a certain buffer is being performed, data may be stored almost constantly in another buffer. Condition will be obtained.
- the encryption / decryption / demodulation processing for the content A is completed, and the writing of digital audio data as the content A to the buffer is also performed, for example, to the buffer 3 It is assumed that writing has been completed.
- the encryption / decryption of the content A is performed at the time t4.
- the content A can be read by the reproduction output transfer processing for the time represented by the unit reproduction time T s X 2.
- the time required for the fringe demodulation processing for content B is a processing time that is longer than the unit playback time T s corresponding to one buffer storage capacity, but shorter than the unit playback time T s X 2. Suppose there was.
- the fringe demodulation processing for the content B is performed in the unit playback
- the process ends at time t5 in the period from time t4 to time t6 corresponding to time TsX2.
- the reproduction output system transfer for the content B is performed from the time t6 when the reproduction period of the content A ends. Processing is starting. In other words, it can be seen that the sound reproduction of the content B is started from the time point t6, whereby the continuous reproduction operation of the content A, B is obtained.
- the fringe demodulation processing for the content A is executed in the period t1 to t2.
- the encryption / decryption / demodulation processing for the content A is started at time t2, and is completed at time t4 as in the case of FIG.
- the demodulation processing of the fringe data corresponding to the content B requires a processing time exceeding a normal range. Therefore, the time point t5, which is the end point of the fringe demodulation processing for the content B started from the time point t4, is later than the time point t5 at which the reproduction output transfer processing for the content A is completed. It has become.
- the encryption / decryption process for content B is performed by fringe recovery for content B.
- the execution cannot be started until after the adjustment process.
- the decoding / decoding Z demodulation processing for the content B is started from the time t5 when the fringe demodulation processing for the content B ends, and the reproduction output system transfer processing for the content B is further performed.
- the process is started from a time t6a after a lapse of a certain time from the time t5. That is, the output of the playback sound of the content B is started from the time point t6a.
- non-playback is performed during the period from the point in time t6 when the playback output system transfer process for the content A is completed to the point in time t6a when the playback output system transfer process for the content B is started.
- a period will occur. In other words, content A and B cannot be played continuously.
- the processing time of the fringe demodulation processing for the next encrypted content to be played exceeds the normal range. If the normal buffer capacity setting does not guarantee continuous playback, the required buffer capacity that is assumed to be larger than normal (hereinafter also referred to as “buffer capacity for long-time processing”) is used. It will be set.
- Such a change in the setting of the buffer capacity can be realized by changing the area setting of the buffers 1, 2, and 3 in the buffer area 20a in the RAM 20 under the control of the CPU 11.
- the area for the capacity A is allocated to each of the buffers 1, 2, and 3 as the normal buffer capacity
- the buffers 1, 2, 3 For each of these, an area of a predetermined capacity B larger than the capacity A is allocated.
- the evening timing chart in Fig. 12 shows the operation in the case where the buffer capacity for long-time processing is set and the content B is played immediately after the content A with a short playback time as in Fig. 11 .
- the encryption / decryption / demodulation processing starts at time t2.
- the encryption / decryption Z demodulation process is defeated, and writing is started from the buffer 1 at the same time t2 and thereafter.
- the capacity of each of the buffers 1, 2, and 3 is set larger than usual, it can be seen that the time required to complete the writing to the buffer 1 is longer.
- the period from time t2 to time t3, at which the playback output transfer process for the content A is started is actually the time period t2 to! It is longer than three. In other words, the standby time until the sound actually starts to be output when the reproduction is started becomes longer.
- the period from the end of the encryption / decryption Z demodulation processing to the end of the reproduction / output system transfer processing is extended. That is, the time width as the periods t4 to t6 in FIG. 12 is longer than the periods t4 to t6 in FIG.
- the fringe demodulation processing for the content B which is executed from time t4, ends at time t5, which is almost the same time length as in the case of FIG.
- the encryption / decryption / demodulation processing of the content B is started from the time t5 when the fringe demodulation processing of the content B is completed, and at a time t6 after a lapse of a certain time from the time t5.
- the playback output system transfer processing for content B has started.
- the end of the playback output system transfer process for content A Immediately after the completion, the reproduction output system transfer processing for the content B is started, thereby enabling the continuous reproduction of the contents A and B.
- switching between the two buffer capacities that is, the normal buffer capacity and the buffer capacity for long-time processing is performed. Then, such switching of the buffer capacity is to be executed by the CPU 11 according to, for example, an encrypted content reproduction program.
- the CPU 11 recognizes that the processing time required for the demodulation processing on the fringe data of the content data to be reproduced next to the encrypted content to be reproduced is within the normal range. Is set to the normal buffer capacity. At this time, for example, as described with reference to FIG. 10, the continuity of the reproduced sound of the continuously reproduced encrypted content can be maintained. On the other hand, when it is recognized that the time required for processing the fringe data of the encrypted content to be reproduced next is longer than the normal range, the buffer capacity is switched to the long-time processing-capable buffer capacity. As a result, as shown in FIG. 12, continuity can be ensured even when playing back encrypted content having a short playback time.
- the content of the fringe data is determined based on information stored in a header or the like added to the fringe data. What is necessary is just to recognize the data size, the format of compression coding, and the like, and to execute processing for estimating the processing time for the fringe data from these recognition results.
- the buffer capacity is changed according to the processing time of the fringe data.
- the encrypted content data whose playback order is one before the encrypted content corresponding to the fringe data This should be done at the start of buffering, but this is just an example.
- the timing for determining the processing time of the fringe data is not particularly limited as long as it is executed at a predetermined timing before the timing at which the buffer capacity should be changed.
- the buffer capacity is switched in two stages.
- the buffer capacity is switched in three or more stages according to the time required for processing fringe data. It may be configured so as to be performed.
- the buffer is formed by allocating the area sizes of the buffers 1, 2, and 3 in the area as the buffer area 20a in the RAM 20.
- a memory element functioning as a buffer may be provided.
- the memory elements having the capacity as the buffers 1, 2, and 3 corresponding to the normal buffer capacity, and the capacity as the buffers 1, 2, and 3 corresponding to the buffer capacity corresponding to the long-time processing It is also conceivable to separately provide a memory element having the following.
- the encoding performed on the content to be reproduced does not need to be limited to the compression encoding and the encryption encoding.
- the content decryption process and the pre-decryption process corresponding to the decryption process may be changed as appropriate.
- the content to be encoded may be, for example, video data in addition to audio data.
- the program can be temporarily stored on a removable recording medium such as a flexible disk, CD-ROM (Compact Disk Read Only Memory), MO (Magnet Optical) disk, DVD (Digital Versatile Disc), magnetic disk, or semiconductor memory. It can be stored (recorded) permanently or permanently.
- a removable recording medium can be provided as so-called package software.
- the program can be recorded on a medium or the like corresponding to the media drive 19 and provided as package software.
- the program can be installed by reading the program from the medium by the media drive 19 and storing the program in the HDD 21 or the ROM 13.
- package software it becomes possible to install the system program to which the present invention is applied, for example, on a general-purpose personal computer.
- the program In addition to installing the program from a removable recording medium as described above, the program must be downloaded from a server that stores the program via a network such as a LAN (Local Area Network) or the Internet. You can do it.
- a network such as a LAN (Local Area Network) or the Internet. You can do it.
- an update program for adding functions to which the present invention is applied later may be configured, and this update program may be distributed as package media or distributed on a network. Conceivable. Users only need to obtain this update and install it in the environment where the existing system is installed. Note that the present invention is not limited to the above-described embodiment described with reference to the drawings, and various changes, substitutions, or equivalents thereof may be made without departing from the scope and spirit of the appended claims.
- the present invention executes a decryption process (encryption decryption / demodulation process) and a pre-decryption process that must be performed at a timing before the start of the decryption process.
- the unit data (contents data) reproduced by this is targeted for information processing. If such unit data should be reproduced and output continuously, the pre-decoding processing for the unit data to be reproduced next to the unit data currently being reproduced and output is performed by the current reproduction output
- the decoding is started at a timing after the completion of the decoding process for the target unit data.
- the decoding preprocessing for the unit data to be reproduced is performed by reading out the data stored in the storage means (storage area) while the reproduction and output of the unit data to be currently reproduced and output are continued. Will be executed.
- the present invention provides, as information processing, a decryption process (encryption decryption / demodulation process) for unit data (content data) and a process to be executed at a timing before the start of the decryption process.
- a decryption process encryption decryption / demodulation process
- the pre-decoding processing for the unit data to be reproduced next to the target unit data is started at a timing after the completion of the decoding processing for the unit data to be currently reproduced and output. .
- the pre-decoding processing for the unit data to be reproduced is executed while the reproduction output of the unit data currently being reproduced and output is continued by reading out the data stored in the storage means. It will be.
- the data capacity of the storage means is changed according to the required processing time length.
- the reproduction output continuation time of the unit data after the completion of the decoding process can be changed according to the processing time length required for the pre-decoding process. That is, for example, even if the processing time required for the pre-decoding processing is considerably long, the reproduction output continuation time of the unit data according to the processing time can be obtained by changing the data storage capacity of the storage means. This makes it possible to maintain continuous reproduction of unit data.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/553,077 US20060198518A1 (en) | 2004-04-07 | 2004-04-07 | Information processing device and information processing method |
EP04726282A EP1617430A1 (en) | 2003-04-24 | 2004-04-07 | Information processing device and information processing method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-119946 | 2003-04-24 | ||
JP2003-119947 | 2003-04-24 | ||
JP2003119947A JP2004326922A (ja) | 2003-04-24 | 2003-04-24 | 情報処理装置、情報処理方法 |
JP2003119946A JP3846449B2 (ja) | 2003-04-24 | 2003-04-24 | 情報処理装置、情報処理方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004095449A1 true WO2004095449A1 (ja) | 2004-11-04 |
Family
ID=33312641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/005017 WO2004095449A1 (ja) | 2003-04-24 | 2004-04-07 | 情報処理装置及び情報処理方法 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1617430A1 (ja) |
KR (1) | KR20050122259A (ja) |
WO (1) | WO2004095449A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100817374B1 (ko) * | 2006-07-24 | 2008-03-27 | 하나로미디어(주) | 그룹화된 복수의 독립된 컨텐츠를 연속 재생하는 시스템 및방법 |
CN104132626B (zh) * | 2014-06-04 | 2016-09-28 | 暨南大学 | 一种光学条纹位相空域解调方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1139156A (ja) * | 1997-07-22 | 1999-02-12 | Fuji Xerox Co Ltd | 暗号化データ復号装置 |
JPH11312364A (ja) * | 1998-04-28 | 1999-11-09 | Mitsubishi Electric Corp | ディジタルデータ記録装置、ディジタルデータ再生装置、及びチェックコード生成方法 |
JP2000165844A (ja) * | 1998-11-19 | 2000-06-16 | Hewlett Packard Co <Hp> | 連続メディア・ストリーム再生システムおよびその方法 |
JP2002132257A (ja) * | 2000-10-26 | 2002-05-09 | Victor Co Of Japan Ltd | Midi楽曲データ再生方法 |
-
2004
- 2004-04-07 KR KR1020057019629A patent/KR20050122259A/ko not_active Application Discontinuation
- 2004-04-07 WO PCT/JP2004/005017 patent/WO2004095449A1/ja active Application Filing
- 2004-04-07 EP EP04726282A patent/EP1617430A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1139156A (ja) * | 1997-07-22 | 1999-02-12 | Fuji Xerox Co Ltd | 暗号化データ復号装置 |
JPH11312364A (ja) * | 1998-04-28 | 1999-11-09 | Mitsubishi Electric Corp | ディジタルデータ記録装置、ディジタルデータ再生装置、及びチェックコード生成方法 |
JP2000165844A (ja) * | 1998-11-19 | 2000-06-16 | Hewlett Packard Co <Hp> | 連続メディア・ストリーム再生システムおよびその方法 |
JP2002132257A (ja) * | 2000-10-26 | 2002-05-09 | Victor Co Of Japan Ltd | Midi楽曲データ再生方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1617430A1 (en) | 2006-01-18 |
KR20050122259A (ko) | 2005-12-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1999042996A1 (fr) | Appareil et procede d'enregistrement / reproduction, et processeur de donnees | |
KR101229522B1 (ko) | 비휘발성 메모리로부터의 미디어 데이터의 효율적인 저전력 리트리브 기법들 | |
KR20010040207A (ko) | 데이터 기록재생장치 및 그 방법 | |
JP2004038988A (ja) | 外部記憶媒体を用いたホスト処理装置 | |
US6990589B1 (en) | Recording and/or playback apparatus and method | |
JP4135051B2 (ja) | 記録再生装置、記録再生方法およびプログラム | |
CN101295528B (zh) | 记录设备、记录方法及程序 | |
JP3846449B2 (ja) | 情報処理装置、情報処理方法 | |
WO2004095449A1 (ja) | 情報処理装置及び情報処理方法 | |
JP2004326922A (ja) | 情報処理装置、情報処理方法 | |
JP4191221B2 (ja) | 記録再生装置、同時記録再生制御方法、および同時記録再生制御プログラム | |
CN100458812C (zh) | 数据处理电路和方法、再现装置和方法及存储介质 | |
US20060198518A1 (en) | Information processing device and information processing method | |
JP3874021B2 (ja) | 記録装置 | |
JP2003224801A (ja) | 再生装置システム、情報処理装置及び情報処理装置の制御方法 | |
JP2004326922A5 (ja) | ||
JP4792684B2 (ja) | 復号装置 | |
US20030058560A1 (en) | Apparatus and method for processing content information capable of time-divisionally carrying out recording and reproducing operations | |
KR100558991B1 (ko) | 휴대용 단말기에서의 오디오 데이터 역재생방법 | |
JP4021756B2 (ja) | 圧縮音声データ記録装置及び圧縮音声データ記録方法 | |
KR100537542B1 (ko) | 카 오디오 시스템의 엠펙 음악파일 재생장치 | |
US9020620B2 (en) | Recording apparatus and method for a storage medium exchange during recording | |
JP2005278201A (ja) | データ転送装置およびデータ転送方法 | |
JP2008084382A (ja) | 圧縮データ再生方法 | |
JP2004038578A (ja) | 情報処理装置、情報処理方法、プログラム、記録媒体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10553077 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020057019629 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004726282 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048108862 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 1020057019629 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2004726282 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 10553077 Country of ref document: US |