JP4003516B2 - Recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital broadcast receiving / accumulating / reproducing apparatus, and more particularly to a stored data management method for storing program data received by digital broadcasting in a storage means.
[0002]
[Prior art]
In recent years, the spread of digital broadcasting has rapidly advanced, and BS digital broadcasting services using broadcasting satellites have been provided following CS digital broadcasting by communication satellites. In the future, digital broadcasting services using terrestrial waves are also planned, and a variety of contents can be viewed through digital broadcasting. Since digital broadcasting compresses and digitizes program data, it is possible to store programs on a hard disk drive (hereinafter abbreviated as HDD), which is a digital data storage medium that has been used in PCs (Personal Computers). It has become.
[0003]
In the HDD, it is important to efficiently store and manage the HDD because the storage medium cannot be easily exchanged in terms of price and structure as compared with a video tape recorder or the like as a conventional recording device. As such a conventional example, a method as disclosed in JP 2001-169235 A is known. This is a method of securing free space by discarding data that has already been stored when new content is stored.
[0004]
FIG. 17 shows a configuration example of the conventional example, and the operation will be described. In FIG. 17, reference numeral 901 denotes a receiving means such as a tuner for receiving content, 902 denotes a storage management means for managing the storage of content, 903 denotes a storage means for storing content, 904 denotes a presentation means for displaying the content, 907 is a content value evaluation unit that calculates an evaluation value of the content, 906 is a discard candidate selection unit that updates the discard candidate list of the content based on the content evaluation value, and 905 is used to store the content when new content is received. The content discarding unit deletes the minimum necessary content obtained from the list in order to secure the storage capacity of the necessary storage unit.
[0005]
In the configuration of FIG. 17, the evaluation value of the content stored in the storage unit 903 is calculated by the content value evaluation unit 907, and a list describing at least the evaluation value and the data size of the content is created by the discard candidate selection unit 906. As a result, the evaluation value is re-evaluated asynchronously with the reception of the content, and the list is updated. When new content is received, the necessary minimum amount obtained from the list is secured in order to secure the storage capacity necessary for storing this content. The content is deleted from the storage unit 903 by the content discard unit 905.
[0006]
For this reason, when the free space of the storage unit 903 becomes necessary, the content can be discarded based on the list, and the necessary capacity can be secured in a short time.
[0007]
[Problems to be solved by the invention]
In the above conventional example, the case where a large number of relatively small contents in data broadcasting are received and stored is mentioned. However, when recording and managing large-capacity television programs such as dramas, sports programs, documentary programs, etc., the capacity of each content is large, so the free capacity of the storage means is larger than the capacity of the program you want to record. Even if it is slightly insufficient, there is no change in capacity, so there is a problem that it is not possible to secure the capacity to record new content unless the content that has already been accumulated is deleted. The point was not mentioned.
[0008]
In view of the above problems, the present invention is used in total by recording content in storage means built in other devices connected by a network in addition to storage means built in a digital broadcast reception storage / playback device. An object of the present invention is to provide an easy-to-use digital broadcast receiving / storing / reproducing apparatus capable of expanding the available capacity and using the storing means efficiently.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the digital broadcast receiving / accumulating / reproducing apparatus of the present invention, data accumulating means for accumulating / reproducing input data and outputting reproduced data, and accumulating means for controlling data input / output to the data accumulating means A controller, a decoding means for decoding the output data of the data storage means, the data storage means, the storage means controller, a control means for controlling the decoding means, a control program storage means for the control means, Input means for inputting a control command to the control means, and network control means for controlling data exchange with an external device having data storage means, wherein the control means stores data stored in the data storage means Data storage of the external device mounting data storage means for managing the situation and connected to the network control means Recognizes the state, the input data be recorded in any of the storage means or an external device mounted data storage means.
[0010]
Thereby, since data can be stored by efficiently using a plurality of storage means, it is possible to provide an easy-to-use digital broadcast reception storage / playback device.
[0011]
In the digital broadcast reception / storage / playback device of the present invention, the data is encrypted and recorded with the key information unique to the digital broadcast reception / storage / playback device, so that the stored data can be played back by other devices by removing the storage means. Even if you try to use it, you can't use it, and you can now store content with consideration for copyright protection. Also, in the digital broadcast reception / storage / playback apparatus of the present invention, identification information unique to the digital broadcast reception / storage / playback apparatus is added to the data to be recorded, so that it can be easily identified and used from data recorded by other devices. I was able to do it.
[0012]
Further, in the digital broadcast receiving / storing / reproducing apparatus of the present invention, the data installed in the external device when it is determined that all the data instructed to be recorded cannot be recorded in the free capacity of the storing means built in the digital broadcast receiving / storing / reproducing apparatus. By recording at least a part of the data instructed to be recorded in the storage means, the built-in storage means and the storage means mounted on the external device can be used together so that data can be stored efficiently. In addition, the digital broadcast receiving / accumulating / reproducing apparatus of the present invention compresses and records data, thereby enabling efficient data accumulation.
[0013]
In the digital broadcast receiving / accumulating / reproducing apparatus of the present invention, the data format is converted and recorded so that the data can be accumulated efficiently. Furthermore, by making it possible to select two or more data capacities after data format conversion, select whether to prioritize reducing the data capacity after data format conversion, or to minimize degradation of image quality. I was able to record.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a digital broadcast receiving / accumulating / reproducing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
In FIG. 1, 10 is an input terminal for packetized and multiplexed stream data, 20 is a demultiplexer that separates a designated packet from the input stream data, and 30 controls the entire digital broadcast reception / storage / reproduction apparatus of FIG. Control means, 40 is a storage means controller for controlling data input / output of the storage means described later, 50 is storage means, 60 is a data processing RAM (Random Access Memory) of the control means 30, and 70 is encoded video / audio. 80, OSD means for superimposing an OSD (On Screen Display) on the output video signal of the decoder 70, 90 an output terminal for the video signal with the OSD superimposed thereon, 100 an output terminal for the decoded audio signal, 110 A command input terminal for a user to input a command to the digital broadcast receiving / storing / reproducing apparatus using a remote controller (not shown). , 120 is a flash memory storing a control program of the control means 30, 130 is a network control means, and 140 is a data input / output terminal for the network. The demultiplexer 20, the control means 30 device, the storage means controller 40, the RAM 60, the OSD 80, the flash memory 120, and the network control means 130 exchange data and control commands via the bus 150. Reference numeral 160 is a network, 330 is a control means for other devices connected to the network 160, 340 is a storage means controller for other devices connected to the network 160, 350 is a storage means for other devices connected to the network 160, 430 is a network Network control means of other devices connected to 160, 440 is a data input / output terminal for the network of other devices connected to the network 160, and 450 is a bus for exchanging data and commands.
[0015]
In FIG. 1, data input from the stream data input terminal 10 is input to the demultiplexer 20. The input data described in the present embodiment is a video data, audio data, data broadcast data, and various data for use in receiver operation control, etc. obtained by receiving a digital broadcast, multiplexed in packet units. It has been done. An example of the input data is shown in FIG. In FIG. 2, reference numeral 11 denotes a transport stream (hereinafter abbreviated as TS) in ISO / IEC13818-1 (commonly referred to as MPEG2 system standard), which is PAT (Program Association Table) and PMT (Program Map) which are data used for channel selection and the like. Table), NIT (Network Information Table), and packets such as video 1, audio 1, video 2, and audio 2 that compose the received television program.
[0016]
FIG. 3 shows a program selection procedure, and the program selection operation will be described. When the user selects a program with a remote controller or the like in the first step, a corresponding command is input from the command input terminal 110 to the control means 30. In the next step, the control means 30 controls the demultiplexer 20 to separate the PAT information and transfer it to the control means 30. The PAT stores PMT identification information (Packet ID = PID) included in the input stream. The control means 30 recognizes the PMT PID by analyzing the PAT, controls the demultiplexer 20 in the next step, separates the PMT packet, and transfers it to the control means 30. The PMT is a packet for storing a PID of a packet in which video / audio of a program is stored, and a different PID is assigned to each program. Therefore, the channel selection means 30 separates and transfers the PMT corresponding to the program selected by the user to the demultiplexer 20 and analyzes it. In the next step, the control means 30 controls the demultiplexer 20 according to the information obtained by analyzing the PMT to separate the video and audio packets of the program selected by the user.
[0017]
Here, when viewing the separated program as it is, the video and audio data of the separated information is transferred to the decoder 70. The decoder 70 decodes the input encoded video data and encoded audio data, and reproduces the original video signal and audio signal. The video signal reproduced by the decoder 70 is output from the video output terminal 90 via the OSD 80 for superimposing a program guide screen or the like on the video signal, for example. The audio signal reproduced by the decoder 70 is output from the audio signal output terminal 100.
[0018]
Next, the operation when the data of the program selected by the user is stored in the storage means 50 and reproduced will be described. When program data is stored, it is necessary to store not only video / audio packets but also information such as PAT and PMT, unlike the playback described above. This is because it is necessary when reproducing the accumulated program data. When playing back an accumulated program, data related to the program that has not been accumulated is not necessary. If it is, the program must be selected according to the data. Only information related to the video / audio of the selected program. That is, information that is not used like NIT is not accumulated, and program related information such as PAT and PMT is not accumulated as it is, but by controlling the demultiplexer 20 from the control means 30, Data other than the information necessary for reproduction is deleted, for example, to rewrite the contents of the packet. When storage of a program is instructed by a user's operation, the control unit 30 controls the demultiplexer 20 to output a data packet to be stored and output it to the storage unit controller 40. The storage means controller 40 adds and records time information (time stamp) to the input data packet so that it can be reproduced at the correct time during reproduction. An example of data with a time stamp added is shown in FIG. In the example of FIG. 4, a time stamp is added before the packet data, but it may be added after the packet data. The storage means controller 40 stores packet data with a time stamp as shown in FIG. Here, the control means 30 uses the data amount of the program recorded in the storage means 50, the position of the recorded area on the storage means 50 and information related to the program, that is, the program name, the received date and time, etc. as program designation data. It is recorded in a different area from the program data. Further, as the management data of the storage medium 50, the capacity occupied by the data recorded in the storage medium in the storage medium is also recorded.
[0019]
Next, the operation for reproducing the program data stored as described above will be described. When the user performs a reproduction operation of the stored program, a reproduction command is input from the command input terminal 110. The control means 30 controls the storage means controller 40 in accordance with the reproduction command to read the program designation data from the storage means 50 and analyze the contents. The control means 30 controls the storage means controller 40 on the basis of data such as an area in which designated program data is stored in accordance with the analyzed contents, and causes the storage means 50 to read out the stored data. The read program data is transferred from the storage means controller 40 to the demultiplexer 20 at a predetermined timing in accordance with the time stamp data described above. The demultiplexer 20 separates the video / audio data from the input program data and transfers it to the decoder 70. The subsequent operation is the same as the operation at the time of reproduction described above.
[0020]
As described above, program data can be stored and reproduced in the storage means 50.
By the way, since the capacity of the storage means 50 is limited, there may be a case where the storage means 50 does not have enough free capacity to store a certain program. In such a case, a procedure for determining whether or not data can be stored by using the storage means 350 mounted on another device, and storing program data while ensuring free space will be described with reference to FIG.
[0021]
When an instruction to store a program is given to the control unit 30 by a user operation, the control unit 30 receives information on the program instructed to store, acquires information related to the data capacity of the program, and stores the program 50 Compare with the remaining capacity of. As a result of the comparison, if the necessary capacity is in the storage means 50, the designated program is stored as it is. When the necessary free capacity is not in the storage unit 50, the remaining capacity of the storage unit 350 is acquired by the following procedure. First, a management information transfer request for the storage means 350 including the remaining capacity is output to the network 160 via the network control means 130. The management information transfer request is received by the control unit 330 of the external device via the network control unit 430. The control unit 330 reads the management information stored in the storage unit 350 by controlling the storage unit controller 340 and outputs it to the network via the network control unit 440. The control unit 30 can acquire the management information via the network control unit 140 and can check the remaining capacity of the storage unit 50 and the storage unit 350 based on the management information and the management information of the storage unit 50. If it is determined that there is a capacity necessary for storing the program instructed to be stored by this information, for example, data is stored in the storage means 50 by the amount of free capacity, and the amount exceeding the free capacity of the storage means 50 is stored. Is stored in the storage means 350 of the external device. As a result, even if there is not enough free space in the storage means 50 for the data amount of the program supported to be stored, all the programs instructed by using the free space in the storage means 350 of the external device are all used. Can be accumulated.
[0022]
A case where it is determined that the entire designated program cannot be stored even when the free space of the storage unit 350 mounted on the external device is combined will be described. Each time the program data is stored, the control unit 30 gives each stored data a priority for storage based on, for example, the date and time since the storage, the priority set for each genre set by the user, and the capacity of the stored program data. Alternatively, the priorities that have already been assigned are reassigned in consideration of newly accumulated data. When it is determined that the specified program cannot be stored even if the free space of the storage unit 350 mounted on the external device is combined when the storage of a certain program is instructed, the control unit 30 follows the priority regarding the storage. By erasing the low-priority program data, free space is automatically secured without bothering the user and the designated program is saved.
[0023]
In addition, when an instruction for storage is given by a so-called recording reservation before the program actually starts, since data related to the program can be obtained in advance for the purpose of displaying an electronic program guide in general in digital broadcasting, it is related to the storage before the program starts. Judgment is possible. Therefore, in addition to the case where the control related to securing the free space for storage described above is automatically performed, the user can obtain information on the storage means 50 and the storage means 350 mounted on the external device from the screen shown in the example of FIG. The free space may be ensured by the user's operation by presenting.
[0024]
Further, it is also conceivable that the user directly operates the accumulation by a switch such as recording start / recording stop instead of accumulation by dividing the program unit or time. In such a case, accumulation starts in a portion where nothing is accumulated in the accumulating unit 50, and information on the free capacity of the accumulating unit 50 and the accumulating unit 350 mounted on the external device is displayed on a screen as shown in the example of FIG. May be obtained by the control means 30 and presented to the user, thereby presenting the user with information relating to the accumulation operation. As a result, the user can be prompted to perform an operation related to program accumulation.
[0025]
In this way, even if the storage unit 50 has insufficient free space, it is possible to record all programs instructed to be stored. In the above description, the case where information relating to the accumulated program is stored in the accumulating unit 50 has been described. However, this need not necessarily be stored in the accumulating unit 50, for example, an empty area of the flash memory 120 or a different memory. A means may be provided and stored there. Further, in the above description, an example in which information related to stored programs is collectively stored in one area has been described. However, it is not always necessary to store information collectively, and for example, only information related to capacity may be stored in a different area. Absent. The same applies to other information. As the storage means 50, storage means such as an HDD, a writable DVD (Digital Versatile Disk) or a large-capacity magneto-optical disk can be used.
[0026]
FIG. 8 shows the configuration of the storage means controller 40 and its operation will be described. 41 is a time stamp adding means for adding a time stamp to each packet of the input transport stream, 42 is an encryption means, 43 is a data input / output controller for controlling data input / output to the storage means 50, 44 is Encryption / decryption means for decrypting the encrypted data, 45 a timing adjustment means for adjusting the timing of the input data based on the time stamp and outputting it as a transport stream, 460 for a RAM (Random Access Memory), 46 Is a RAM controller that arbitrates data input / output with each block and manages data writing and reading to the RAM 460. In FIG. 8, in order to control data input / output in addition to data, control signals are also exchanged between the RAM controller 46 and each block. In the description of FIG. 8, the RAM controller 46 is interposed in the data transfer between the blocks in order to arbitrate the data transfer timing between the blocks that are basically operating independently.
[0027]
First, the operation for storing data in the storage means 50 will be described. The transport stream input from the demultiplexer 20 is input to the time stamp adding means 41, and for example, a time stamp is added to each packet in the format as shown in FIG. The RAM controller 46 temporarily stores the input data in the RAM 460, and then reads and outputs it according to a request from the encryption means 42. The encryption means 42 encrypts the input data according to a predetermined procedure, and then outputs it to the RAM controller 46. The RAM controller 46 temporarily stores the input data in the RAM 460. Thereafter, the data stored in the RAM 460 is output in accordance with the request of the data input / output controller. The data input / output controller 43 outputs the input data to the storage means 50 for storage.
[0028]
Next, a procedure for reading data stored in the storage means 50 will be described. When a data reproduction instruction is given from the control means 30 to the data input / output controller 43 via the bus 150, the data input / output controller 43 reads out the stored data by controlling the storage means 50 and outputs it to the RAM controller 46. The data is stored in the RAM 460. The RAM controller 46 reads and outputs the data stored in the RAM 460 in accordance with the data transfer request from the encryption / decryption means 44. The encryption / decryption means 44 decrypts the input encrypted data according to a predetermined procedure, decrypts the data before encryption, and outputs it to the RAM controller 46. The RAM controller 46 temporarily stores the input data in the RAM 460, reads out the data from the RAM 460 according to the data transfer request from the timing adjustment unit 45, and outputs the data. The timing adjustment unit 45 outputs the input data in the form of a transport stream while adjusting the timing according to the time stamp added to the input data.
[0029]
With the configuration and operation described above, the transport stream input from the demultiplexer 20 can be managed by managing the time information of each packet and stored in the storage means 50. Further, since the encrypted data is decrypted at the time of reproduction and the data is output after adjusting the timing according to the time stamp, the original transport stream can be reproduced. In the above description, since the data stored in the storage means 50 is encrypted, the storage means 50 is removed by, for example, performing encryption using key data unique to the digital broadcast reception storage / playback apparatus, and other devices. It is possible to prevent playback even when connected to the PC, and is effective in protecting the copyright of the stored program data (contents).
[0030]
Next, a case where data is recorded in the storage unit 350 mounted on the external device will be described. In FIG. 8, the data encrypted by the encryption means 42 and stored in the RAM 460 is transferred to the network control means 130 via the bus 150 under the control of the control means 30 and includes information unique to the digital broadcast reception / storage / reproduction apparatus. The program data identification information and the identification information indicating that the transfer destination is a specific external device are added, and the program data is transmitted to the network 160. The transmitted information is received by the network control unit 430 of the external device, and when the control unit 330 recognizes that the transmitted data is directed to the external device, the data is stored under the control of the storage unit controller 340. Accumulate in means 350. Since the stored data has already been encrypted, the copyright can be effectively protected even in this case as in the above description.
[0031]
FIG. 9 shows another embodiment of the present invention, and the operation will be described below. 9 differs from the configuration of FIG. 8 in that a compression / expansion means 47 is provided. An example of operation steps when the configuration of FIG. 9 is used is shown in FIG. The transport stream input to the storage means controller 40 is time stamped by the time stamp adding means. In the next step, the encryption means 42 encrypts the data. In the next step, the encrypted data stored in the RAM 460 is input to the data compression / expansion means 47 and compressed according to a predetermined algorithm. As a result, the amount of data stored in the storage means 50 is smaller than that of the original data, so that more data can be stored in the storage means 50 and the storage means 350 of the external device. Although the example of compressing the data after encrypting it is shown in the step of FIG. 10, it is not necessarily limited to this procedure. For example, as shown in the example of the step of FIG. May be. Even in this case, the same effect as in the case of the step of FIG. 10 can be obtained. The above operation is controlled by the control means 30.
In the above, if the control unit 30 determines that all data instructed to be recorded by the storage unit 50 cannot be recorded even after the data is compressed, the amount that cannot be recorded in the storage unit 50 is stored in the external device via the network 160. By controlling by the control means 30 to record in the means 350, all data instructed to be recorded can be recorded. Furthermore, even if the data is compressed according to the above description, if the control unit 30 determines that all the data instructed to be stored in the free space of the storage unit 50 and the storage unit 350 mounted on the external device cannot be recorded. Similarly to the description in FIG. 5, according to the priority given to the recorded data, the low-priority data is deleted to secure a free space, and the data instructed to be stored is stored. Good.
[0032]
FIG. 12 shows a procedure for reproducing data stored in the storage means 50 or the storage means 350 of the external device in accordance with the above description. The data read from the storage means 50 is first decoded into data before compression by the compression / expansion means 47. When reading from the storage unit 350 of the external device, after the data is read from the storage unit 350 of the external device, the data is input to the compression / decompression unit 47 after executing the step of transferring the data via the network 160, and the original data is stored. Decrypted. In the next step, the decrypted data is input to the encryption / decryption means 44 to decrypt the data. The following reproduction operation is the same as that in the case of using FIG. In the case of reproducing the stored data according to the steps of FIG. 11, the reproduction is performed according to the steps shown in the example of FIG. That is, the data read from the storage means 50 or the data read from the storage means 350 mounted on the external device and transferred via the network 160 is first decrypted by the encryption / decryption means 44. Next, the compression / decompression means 47 decompresses the data and decodes it to the original data. The subsequent operation is the same as the description of the reproduction operation in FIG.
[0033]
In the above description, an example in which data is processed using dedicated means for data compression / decompression has been shown. However, if there is a sufficient margin for data processing performance of the control means 30, data is transmitted using the control means 30. The compression / decompression may be performed. In this case, the control means 30 reads the data stored in the RAM 460 via the bus 150 and performs compression / decompression processing of the data. Even in this case, the same effects as described above can be obtained.
[0034]
FIG. 14 shows another embodiment of the present invention and its operation will be described. FIG. 14 differs from the configuration of FIG. 9 in that a data format conversion / decoding unit 48 for converting the data format and decoding the converted data is provided instead of the compression / decompression unit 47. FIG. 15 shows an example of operation steps when the configuration of FIG. 14 is used. The transport stream input to the storage means controller 40 is added with a time stamp by the time stamp adding means and also input to the data format conversion / decoding means 48. Here, for example, when recording of the output of the time stamp adding circuit 41 is selected by a user operation, the same operation as in FIG. 8 is performed. On the other hand, when the output of the data format conversion / decoding unit 48 is selected as the data to be recorded, the output of the data format conversion / decoding unit 48 is recorded through the operations described below. When the output of the data format conversion / decryption means 48 is selected as data to be recorded, the data output from the data format conversion / decryption means 48 and stored in the RAM 46 is input to the encryption means 42 and encrypted. The encrypted data is output to the RAM controller 46 and stored in the RAM 460. The data stored in the RAM 460 in this way is recorded in the storage means 50 by the data input / output controller 43 as described with reference to FIG.
[0035]
Here, the received data in the MPEG2 format is converted by the data format conversion / decoding unit 48 into a format having a smaller data capacity, such as MPEG4, so that the capacity required for storage in the storage unit 50 is reduced. be able to. As a result, the amount of data stored in the storage means 50 is smaller than that of the original data, so that more data can be stored in the storage means 50 and the storage means 350 of the external device. The above operation is controlled by the control means 30. In addition, when converting the data format using the data format conversion / decoding means 48, it is possible to select from two or more types of converted data capacity, for example, to give priority to reducing the data capacity, It is possible to select whether or not conversion is performed so as not to deteriorate as much as possible.
[0036]
In the above description, if the control unit 30 determines that all the data instructed to be recorded in the storage unit 50 cannot be recorded even if the format of the data is converted, the amount that cannot be recorded in the storage unit 50 is transferred to the external device via the network 160. By controlling by the control means 30 so as to record in the empty portion of the storage means 350, all data instructed to be recorded can be recorded. Furthermore, even if the format of the data is converted according to the above description, the control unit 30 determines that all the data instructed to be stored cannot be recorded in the vacant portions of the storage unit 50 and the storage unit 350 mounted on the external device. In the case, as described with reference to FIG. 5, according to the priority given to the recorded data, the low-priority data is erased to secure a free space, and the data instructed to be accumulated is accumulated. do it.
[0037]
FIG. 16 shows a procedure for reproducing the data stored in the storage means 50 or the storage means 350 of the external device in accordance with the above description. The data read from the storage means 50 is input to the encryption / decryption means 44 via the RAM 46 and the data is decrypted. Similarly, the decrypted data is input to the data format conversion / decryption means 48 via the RAM 46, decrypted as a display signal, and output to the OSD means 80 shown in FIG. 1 (not shown in FIG. 14). ) As a result, it is possible to view the recorded data after converting the data format. In the case of reading from the storage unit 350 of the external device, the data read from the storage unit 350 of the external device is transferred via the network 160 and input to the encryption / decryption unit 44 via the RAM 46, whereby the data is encrypted. Decrypted. Subsequent operations are the same as described above.
[0038]
In the above description, an example of processing data using dedicated means for data format conversion and decoding has been shown. However, if the data processing performance of the control means 30 has a sufficient margin, the control means 30 is used. Data format conversion and decryption may be performed. In this case, the control means 30 reads the data stored in the RAM 460 via the bus 150 and performs format conversion and decoding processing of the data. Even in this case, the same effects as described above can be obtained. In this case, only a display signal output circuit for outputting the decoded data as a display signal may be provided. In the above description, an example is shown in which data is converted into the MPEG4 format. However, the data need not be limited to the MPEG4 format, and may be converted into the MPEG1 format, for example. Furthermore, even if the MPEG2 format is the same, if the format before conversion is, for example, an HDTV with 1125 scanning lines, it may be converted into an SDTV with 525 scanning lines. In either case, it goes without saying that the same effects as described above can be obtained.
[0039]
In the above description, the external device shown in FIG. 1 shows only the configuration necessary for storage means and network control. However, actually, other than this, for example, a digital broadcast receiving function or other data input function is provided. It may be a device possessed, or may be a device specialized for storing and reproducing data using storage means.
[0040]
【The invention's effect】
As described above, according to the present invention, in addition to the storage means built in the digital broadcast reception storage / playback apparatus, the storage means mounted on the external device can also be used for program data storage. Can be done automatically. Furthermore, since the data to be stored can be encrypted so that it cannot be played back by a device other than a specific digital broadcast reception storage / playback device, it is effective for protecting the copyright of the data. In addition, the data can be compressed and stored, or the data can be converted and stored in a different format with a smaller amount of data, so the storage means can be used effectively, and the digital broadcast reception, storage, and playback are easy to use. An apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a digital broadcast receiving / storing / reproducing apparatus according to the present invention.
FIG. 2 is a diagram showing an example of a packet arrangement of a stream processed in the present invention.
FIG. 3 is a diagram showing a program selection procedure of the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention;
FIG. 4 is a diagram showing an example of an accumulated data format in the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
FIG. 5 is a diagram illustrating an example of operation steps of a digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
FIG. 6 is a diagram showing an example of a display screen of the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
FIG. 7 is a view showing an example of a display screen of the digital broadcast receiving / storing / reproducing apparatus according to the present invention.
FIG. 8 is a diagram showing a configuration example of a storage means controller in the digital broadcast reception storage / playback apparatus according to the present invention.
FIG. 9 is a diagram showing a configuration example of a storage means controller in the digital broadcast reception storage / playback apparatus according to the present invention.
FIG. 10 is a diagram showing an example of a procedure when data is stored in the digital broadcast reception storage / playback apparatus according to the present invention.
FIG. 11 is a diagram showing an example of a procedure when data is stored in the digital broadcast reception storage / playback apparatus according to the present invention.
FIG. 12 is a diagram showing an example of a procedure for reproducing data in the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
FIG. 13 is a diagram showing an example of a procedure for reproducing data in the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention.
FIG. 14 is a diagram showing a configuration example of a storage means controller in the digital broadcast reception storage / playback apparatus according to the present invention.
FIG. 15 is a diagram showing an example of a procedure when data is stored in the digital broadcast reception storage / playback apparatus according to the present invention;
FIG. 16 is a diagram showing an example of a procedure for reproducing data in the digital broadcast receiving / accumulating / reproducing apparatus according to the present invention;
FIG. 17 is a diagram illustrating a configuration example of a receiving apparatus including a conventional storage unit.
[Explanation of symbols]
10 ... Stream input terminal
20 ... Demultiplexer
30, 330... Control means
40, 340... Storage means controller
41 Time stamp adding means
42. Encryption means
43 ... Data I / O controller
44 ... Encryption / decryption means
45... Timing adjustment means
46 ... RAM controller
460 ... RAM
47. Compression / extension means
48 ... Data format conversion / decoding means
50, 350... Storage means
60 ... Memory
70: Decoder
80 ... OSD
90 ... Video signal output terminal
100: Audio signal output terminal.
110: Command input terminal
120... Flash memory
130, 430 ... Network control means
140, 440 ... Data input / output terminal
150 ... Bus
160 ... Network

Claims (7)

In a recording device for recording stream data,
An input unit for inputting stream data;
A recording unit controller that encrypts the stream data input to the input unit so that it cannot be reproduced by another recording device;
A recording unit for recording the stream data encrypted by the recording unit controller;
A network control unit that outputs the stream data encrypted by the recording unit controller to the other recording device connected to the recording device via a network;
The stream data encrypted by the recording unit controller is recorded in the recording unit when it is recordable in the recording unit of the recording device, and the other connected via the network when the recording unit cannot record the stream data. And a control unit that controls the network control unit to output to the recording device. The recording apparatus according to claim 1,
The network control unit adds information for identifying the encrypted stream data and identification information for the other recording device when outputting the encrypted stream data to the other recording device connected to the recording device via a network. Output device. The recording apparatus according to claim 1 or 2,
Having a decoder;
The recording unit controller includes means for decrypting the encrypted stream data;
The control unit receives the stream data encrypted by the recording unit controller recorded in another recording device connected by the network, and controls to decrypt the encrypted data and output the decrypted data to the decoder apparatus. The recording apparatus according to any one of claims 1 to 3,
The control unit determines whether or not the stream data input to the input unit can be recorded in the recording unit. If the control unit determines that recording is not possible, the stream data input to the input unit is It is determined whether or not recording is possible using the other recording device together, and when it is determined that recording is possible, the recording unit controller encrypts the stream data input to the input unit and can record the capacity in the recording unit A recording apparatus that controls the network control unit to record the encrypted stream data corresponding to the above and records the remaining encrypted stream data to the other recording apparatus. The recording apparatus according to claim 4,
The controller requests the other recording device for information on the other recording device including the remaining capacity of the other recording device via the network control unit, and responds to the request from the other recording device. And a recording device that determines whether or not the stream data input to the input unit can be recorded in the recording unit and the other recording device. The recording apparatus according to claim 4,
A recording device that erases data recorded in the recording unit when the control unit determines that the stream data input to the input unit cannot be recorded in the recording unit and the other recording device. In a recording device for recording stream data,
An input unit for receiving input of stream data;
A recording unit controller that encrypts the stream data input to the input unit so that it cannot be reproduced by another recording device;
A recording unit that records encrypted stream data that is stream data encrypted by the recording unit controller;
A network control unit for adding the information identifying the encrypted stream data and the identification information of the other recording apparatus to the encrypted stream data and outputting the encrypted stream data to the other recording apparatus connected to the recording apparatus via a network; ,
It is determined whether the capacity of the stream data input to the input unit is within the free capacity of the recording unit of the recording apparatus. If it is determined that the capacity is larger than the free capacity, the capacity of the stream data is the recording capacity. The recording unit controller encrypts the stream data input to the input unit and determines whether or not the recording unit is within the total free capacity of the recording unit and the other recording device. A control unit for controlling the network control unit to record the encrypted stream data corresponding to the recordable capacity on the other recording device and to record the remaining encrypted stream data on the other recording device A recording apparatus.

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