JP2007258820A - Digital broadcasting recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcasting recording and reproducing device capable of recording a scrambled bit stream and achieving high-speed reproduction. <P>SOLUTION: The digital broadcasting recording and reproducing device comprises: an extractor 111 for extracting each packet belonging to a desired program from a bit stream composed by the assembly of a plurality of packets including at least one piece of information; a descrambler 112 for descrambling each packet belonging to the desired program; a management table creator 113 for detecting inherent information from a packet including specified information in each packet belonging to the desired program, calculating position information in each packet belonging to the desired program for each packet including the specified information, and creating a management table for indicating the correlation between the inherent information and the position information; and a storage 18 for storing each packet belonging to the desired program and the management table. The management table creator 113 creates the management table at least at the first reproduction of each packet belonging to the stored desired program. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast recording / reproducing apparatus for recording / reproducing a bit stream of a digital broadcast signal compliant with a compression coding standard such as Moving Picture Expert Group (MPEG).

  In recent years, digital broadcasting using the MPEG2-transport stream (TS) standard defined by the MPEG2 system standard, which is a standard for image transmission and compression technology, has been put into practical use. The bit stream defined by the MPEG2-TS standard is composed of a plurality of TS packets, and video information, audio information, and service information called SI, PSI, etc. are multiplexed and transmitted in each TS packet. A technique is known in which a bit stream of a scrambled digital broadcast signal is descrambled and a TS packet after descrambling is recorded as it is so that the quality of the digital signal can be maintained and recorded (for example, Patent Document 1). reference.). Note that scramble means encryption processing in the transmission path, and descrambling means encryption decryption processing.

  Further, in order to realize high-speed playback such as fast-forward and fast-reverse as in a video tape recorder (VTR), a method for creating a management table for high-speed playback at the time of recording a bitstream has been proposed (for example, (See Patent Document 2).

However, in the method of descrambling the scrambled digital broadcast signal and recording the TS packet as it is, the content copy protection cannot be maintained. On the other hand, in order to create a management table for high-speed playback at the time of recording, it is necessary to descramble the scrambled digital broadcast signal. Therefore, high-speed playback cannot be realized while maintaining content copy protection. However, it is desired to realize a digital broadcast recording / reproducing apparatus that can record a scrambled bit stream and realize high-speed reproduction.
JP-A-11-313282 JP 2002-185920 A

  The present invention provides a digital broadcast recording / reproducing apparatus that can record a scrambled bit stream and can realize high-speed reproduction.

  According to one aspect of the present invention, an extraction unit that extracts each packet belonging to a desired program from a bitstream including a plurality of packets including at least one piece of information, and descrambles each packet belonging to the desired program The unique information is detected from the descramble unit and the packet including the specific information among the packets belonging to the desired program, the position information of the packet including the specific information is calculated, and the correlation between the specific information and the position information is calculated. A management table creation unit for creating a management table, a storage unit for storing each packet and management table belonging to a desired program, and a management table at the time of reproducing each packet belonging to the stored desired program, A digital device comprising: an extraction unit, a descrambling unit, a management table creation unit, and a control unit that controls at least one of the storage units Feeding the recording and reproducing apparatus is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the digital broadcast recording / reproducing apparatus which can record the bit stream as scrambled and can also implement | achieve high-speed reproduction can be provided.

  Next, first and second embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings in the first and second embodiments, the same or similar parts are denoted by the same or similar reference numerals.

(First embodiment)
As shown in FIG. 1, the digital broadcast receiving system according to the first embodiment of the present invention includes an antenna 2, a receiving device 3, a digital broadcast recording / reproducing device 1a, a display device 4, and an audio output device 5. In the digital broadcast receiving system shown in FIG. 1, the antenna 2 first receives a scrambled broadcast signal and outputs it to the receiving device 3 as a received signal. The receiving device 3 performs error correction decoding on the received signal input from the antenna 2, demodulates the bit stream, and outputs it to the digital broadcast recording / reproducing device 1a. The digital broadcast recording / reproducing apparatus 1a extracts each packet belonging to a desired program from the bit stream, and records / reproduces each extracted packet. In addition to the receiving device 3, a display device 4 and an audio output device 5 are connected to the digital broadcast recording / reproducing device 1a. The digital broadcast recording / reproducing apparatus 1a outputs the reproduced signal to the display apparatus 4 and the audio information to the audio output apparatus 5 respectively. The display device 4 displays the video signal input from the digital broadcast recording / reproducing device 1a as a video. The audio output device 5 reproduces the audio signal input from the digital broadcast recording / reproducing device 1a as audio. The display device 4 corresponds to, for example, a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma display panel (PDP), or the like. For example, the sound reproducing device corresponds to a speaker or the like.

  The digital broadcast recording / reproducing apparatus 1a includes a demultiplexer 11a, a data bus 60, a memory 13, a video decoder 14, an audio decoder 15, a display control unit 16, a control unit 17a, and a storage unit 18, and through the data bus 60, A demultiplexer 11a, a memory 13, a video decoder 14, an audio decoder 15, a control unit 17a, and a storage unit 18 are connected to each other.

  The demultiplexer 11a includes an extraction unit 111 that extracts each packet that belongs to a desired program from a bitstream that includes a plurality of packets including at least one piece of information, and a descrambling unit that descrambles each packet that belongs to the desired program 112 and management indicating the correlation between the specific information and the position information by detecting the specific information from the packet including the specific information among the packets belonging to the desired program, calculating the position information of the packet including the specific information And a management table creation unit 113 for creating a table. Details of “specific information”, “unique information”, and “position information” will be described later. The storage unit 18 stores each packet and management table belonging to a desired program. The storage unit 18 can be a magnetic storage medium such as a hard disk. The control unit 17a creates at least one of the extraction unit 111, the descrambling unit 112, the management table creation unit 113, and the storage unit 18 in order to create a management table when each packet belonging to the stored desired program is played back. Control.

  In the following, a case where a broadcast signal is encoded and multiplexed in conformity with the MPEG2-transport stream (TS) standard will be described as an example. “Each packet belonging to a desired program” means a packet group from which packets not related to a desired program (program) are removed, and is called a partial transport stream (partial TS) in MPEG2-TS.

  In the MPEG2-TS standard, video information and audio information are encoded on the transmission side (broadcasting station side), and the encoded video information and audio information are packetized. Further, each packet is divided, a header is added, and finally it is transmitted as a TS packet.

  In addition, the control unit 17a records at least one of the extraction unit 111, the descrambling unit 112, the management table creation unit 113, and the storage unit 18 in order to record the partial TS and the management table in the storage unit 18. 171 and a playback control unit that controls at least one of the extraction unit 111, the descrambling unit 112, the management table creation unit 113, or the storage unit 18 in order to play back the partial TS stored in the storage unit 18 from the storage unit 18. With.

  First, the operation when a partial TS is recorded by the digital broadcast recording / reproducing apparatus 1a will be described.

  The extraction unit 111 of the demultiplexer 11a detects the packet identifier (PID) of each TS packet constituting the bit stream input from the receiving device 3, and selects the TS packet according to the PID. The selected TS packet is temporarily stored in the first recording buffer area 131 of the memory 13 through the data bus 60 as a partial TS.

  The PID used for selecting the TS packets is set in advance in the demultiplexer 11a by the recording control unit 171 of the control unit 17a via the data bus 60 or a path (not shown).

  The recording control unit 171 instructs the storage unit 18 to periodically write the partial TS stored in the first recording buffer area 131 to the bit stream storage area 181 of the storage unit 18 via the data bus 60. To do. That is, the partial TS is recorded in the storage unit 18 under the control of the recording control unit 171.

  Note that the term “periodic” means, for example, every time the free space (remaining amount) of the first recording buffer area 131 reaches a certain threshold value, or every time a certain number of TS packets in the first recording buffer area 131 are stored. , Etc. However, in the embodiment of the present invention, the moving reference (timing) is not limited to the above two.

  As a result of the partial TS being periodically recorded in the storage unit 18, the bit stream storage area 181 includes TS packets PV1, PV2,..., Audio information including video information in the payload, as shown in FIG. TS packets PA1, PA2,... Included in the payload, and TS packets PS1, PS2,.

  Next, the operation in the case of reproducing the partial TS recorded by the digital broadcast recording / reproducing apparatus 1a will be described.

  The playback control unit 172 instructs the storage unit 18 to read the partial TS recorded in the storage unit 18 to the first playback buffer area 132 of the memory 13 via the data bus 60.

  The partial TS stored in the storage unit 18 is temporarily stored in the first reproduction buffer area 132 of the memory 13 via the data bus 60.

  The demultiplexer 11a reads the partial TS stored in the first reproduction buffer area 132 via the data bus 60. As in the case of recording, the PID of each TS packet constituting the read partial TS is detected, and the TS packet is selected according to the PID. The selected TS packet is temporarily output to the descrambling unit 112.

  When the TS packet input from the extraction unit 111 is scrambled, the descrambling unit 112 descrambles the TS packet and outputs the result to the extraction unit 111. If it is not scrambled, nothing is performed and the TS packet is output to the extraction unit 111 as it is. Only the scrambled TS packet may be output to the descrambling unit 112.

  The extraction unit 111 extracts part or all of the TS packet based on the type of information included in the TS packet, and stores it in the buffer area (not shown) of various information in the memory 13 via the data bus 60. To do. For example, if the information contained in the TS packet is video information, it is stored in the video information buffer area, if it is audio information, it is stored in the audio information buffer area, and if it is service information, it is stored in the service information buffer area. Is done. It should be noted that part or all of the stored TS packets are referred to as “video data” in the case of video information, and “audio data” in the case of audio information.

  The video decoder 14 reads the video data stored in the video information buffer area, decodes the video signal, and outputs it to the display device 4. The audio decoder 15 reads the audio data stored in the audio information buffer area, decodes the audio signal, and outputs it to the audio output device 5. The display device 4 reproduces the video signal, and the audio output device 5 reproduces the audio signal.

  The service information stored in the service information buffer area also includes character information such as subtitles, and a decoder (not shown) may be required to decode the information. . Also, some service information may be decoded by the control unit 17a.

  That is, each information included in the TS packet is transferred from the demultiplexer 11a to the video decoder 14, the audio decoder 15, the control unit 17a, or a decoder (not shown) via the memory 13 and the data bus 60, and decoded. Is done.

  In the first embodiment of the present invention, the information delivery method is not limited to the above-described memory 13. For example, it is possible to pass through only the data bus 60 or another route (not shown).

  As described above, the digital broadcast recording / reproducing apparatus 1a records / reproduces the partial TS that is a part or all of the bit stream (TS). In other words, the partial TS is recorded while being scrambled and descrambled when the partial TS is reproduced, so that recording / reproduction can be performed while maintaining copy protection of the content.

  Furthermore, in the first embodiment of the present invention, as described below, a TS packet including video information (corresponding to a “packet including specific information”) is a partial TS at the first and subsequent playbacks. By creating a management table for identifying the positions where the management table is scattered, high-speed reproduction after the creation of the management table becomes possible. Hereinafter, a case where a management table is created during the first reproduction will be described as an example.

  When the recorded bit stream (partial TS) is reproduced for the first time, when the TS packet including the video information is detected by the extraction unit 111, the detected TS packet (or only the video data portion) is temporarily stored in the management table creation unit 113. Output to. At this time, the demultiplexer 11a counts the number of read TS packets by the extraction unit 111 or a functional block not shown. The count value can be referred to in order for the management table creation unit 113 to calculate position information in which packets including video information are multiplexed in the partial TS. Whether or not playback is the first time (first time) is preset in the demultiplexer 11a from the playback control unit 172 by the data bus 60 or a path not shown.

  The management table creation unit 113 detects the beginning of a picture from the video data input from the extraction unit 111. If it can be detected, the management associates the picture type (corresponding to unique information) and the number (packet number, corresponding to position information) that the TS packet containing the video data counts from the first TS packet of the partial TS. Create a table. The picture will be described later.

  A specific example of the management table is shown in FIG. As shown in FIG. 3, it is possible to determine which picture packet of which picture type is included from which TS packet. In FIG. 3, the following can be determined. The determination may be made by the extraction unit 111 or the reproduction control unit 172.

Picture type: I video data is included from the 1224th TS packet Picture type: P video data is included from the 1634th TS packet Picture type: B video data is included from the 2023rd TS packet Picture type : B video data is included from the 2517th TS packet Picture type: P video data is included from the 3012th TS packet Picture type: B video data is included from the 3233th TS packet Picture type: B The management table including the 4010th TS data is temporarily stored in the second recording buffer area 133 of the memory 13 via the data bus 60. The storage may be performed after the demultiplexer 11a completes the association of at least one picture.

  The recording control unit 171 of the control unit 17a accumulates that the management table stored in the second recording buffer area 133 is periodically written to the management table storage area 182 of the accumulation unit 18 via the data bus 60. The unit 18 is instructed. That is, the management table is recorded in the storage unit 18 under the control of the recording control unit 171.

  During the second playback, the storage unit for the control unit 17a to read a part or all of the management table stored in the management table storage area 182 to the second playback buffer area 134 via the data bus 60. 18 is controlled. In accordance with the control, the management table is stored in the second reproduction buffer area 134.

  The playback control unit 172 transfers a packet including an arbitrary picture to the bit stream storage area 181 from each picture indicated by the management table in the second playback buffer area 134 and the number of packets (number) up to the packet including the picture. The storage unit 18 is controlled to read from the stored partial TS to the first reproduction buffer area 132.

  For example, in FIG. 3, if only an I-type picture (hereinafter referred to as an I picture) and a P-type picture (hereinafter referred to as a P picture) are reproduced, the following control may be performed.

  First, in order to reproduce the I picture, the 1224th to 1633th packets are read. In order to reproduce the P picture second, the 1634th to 2022th packets are read. In order to reproduce the third P picture, the 3012st to 3232nd packets are read. Similarly, the n-th I or P picture is read / reproduced (n: integer greater than or equal to 4).

  As a result, only the I and P pictures excluding the B picture are reproduced. For example, a P picture is originally reproduced at a time when a B picture is reproduced, and the picture during this time is reproduced in a skipped state. As a result, high speed reproduction can be realized.

  Therefore, by creating a management table after the first reproduction, high-speed reproduction can be realized for the partial TS recorded while being scrambled.

  Next, an example of a recording procedure in the digital broadcast recording / reproducing apparatus 1a shown in FIG. 1 will be described with reference to a flowchart shown in FIG. Note that the flowchart of FIG. 4 shows an operation flow of the demultiplexer 11a during the recording process.

  (A) In step S99, it is determined whether a recording end command is instructed from the recording control unit 171 to the demultiplexer 11a. If the recording end command is instructed, the recording process is ended, and if there is no end command, the process proceeds to step S100.

  (B) In step S100, the extraction unit 111 detects the PID included in the header portion of each TS packet constituting the bit stream, and is recorded in accordance with an instruction from the recording control unit 171 (hereinafter referred to as a recording packet). (Target packet) is extracted. When the TS packet to be recorded is extracted, the process proceeds to step S101.

  (C) In step S101, the recording control unit 171 controls the demultiplexer 11a so as to temporarily store the TS packet to be recorded in the first recording buffer area 131 via the data bus 60. . Furthermore, the recording control unit 171 stores data of a predetermined size in the first recording buffer area 131 in the bit stream storage area 181 in the storage unit 18 via the data bus 60. Thus, the memory 13 and the storage unit 18 are controlled. At this point, no management table is created.

  (E) In step S102, it is determined whether the TS packet to be recorded is a TS packet being displayed and reproduced while being recorded. If it is determined that the TS packet is being displayed and reproduced, the process proceeds to step S103. If it is determined that the TS packet is not being displayed, the recording process ends.

  (F) In step S103, the reproduction control unit 172 determines whether or not the TS packet to be reproduced is scrambled. If it is determined that the TS packet to be reproduced is scrambled, the process proceeds to step S104. If it is determined that the TS packet to be played back is not scrambled, the process proceeds to step S105.

  (G) In step S104, the descrambling unit 112 descrambles the TS packet to be reproduced.

  (H) In step S105, the extraction unit 111 determines the content of the payload of the descrambled TS packet. When the content of the payload of the descrambled TS packet is video data, the video payload data is transferred to the video decoder 14. When the content of the payload of the descrambled TS packet is audio data, the audio payload data is transferred to the audio decoder 15. Next, the process returns to step S99.

  Next, an example of the first reproduction processing procedure in the digital broadcast recording / reproducing apparatus 1a shown in FIG. 1 will be described with reference to the flowchart shown in FIG. The flowchart of FIG. 5 shows an operation flow of the demultiplexer 11a in the first reproduction process.

  (A) In step S199, it is determined whether or not a playback stop command is instructed from the playback control unit 172. If a reproduction process stop command is instructed, the reproduction process is terminated. If the playback stop command is not instructed, the process proceeds to step S200.

  (B) If there is an empty space in the first reproduction buffer area 132 in step S200, the TS packet recorded in the bit stream storage area 181 is stored in the first reproduction buffer area 132 via the data bus 60.

  (C) In step S <b> 201, the extraction unit 111 reads out the TS packet stored in the first reproduction buffer area 132 via the data bus 60. In addition, the management table creation unit 113 counts the number of read TS packets.

  (D) In step S202, the extraction unit 111 determines whether or not the read TS packet is a TS packet to be reproduced. If it is determined that the read TS packet is a TS packet to be reproduced, the process proceeds to step S203.

  (E) In step S203, the extraction unit 111 determines whether the TS packet to be played is scrambled. If it is determined that the TS packet to be reproduced is scrambled, the process proceeds to step S204. If it is determined that the TS packet to be played back is not scrambled, the process proceeds to step S205.

  (F) In step S204, the descrambling unit 112 descrambles the TS packet to be reproduced. When the TS packet to be reproduced is descrambled, the process proceeds to step S205.

  (G) In step S205, the extraction unit 111 determines whether the content of the payload of the descrambled TS packet is video or audio data. When the content of the payload of the descrambled TS packet is video data, the process proceeds to step S206. When the content of the payload of the descrambled TS packet is audio data, the process proceeds to step S207.

  (H) In step S206, the management table creating unit 113 determines, for example, whether the TS packet includes the picture head. If it is determined that the TS packet contains the picture head, the process proceeds to step S208. If it is determined that the TS packet does not include the picture head, the process proceeds to step S209.

  (I) In step S208, the management table creation unit 113 creates the management table shown in FIG. 3 from the number of read TS packets and the picture type, and stores it in the second recording buffer area 133 via the data bus 60. Write.

  (J) In step S209, the extraction unit 111 transfers the video payload data of the TS packet to the video decoder 14.

  (K) On the other hand, in step S207, the extraction unit 111 transfers the audio payload data in the TS packet to the audio decoder 15.

  Next, a procedure example of high-speed playback processing in the digital broadcast recording / playback apparatus 1a shown in FIG. 1 will be described with reference to a flowchart shown in FIG. Note that high-speed playback means fast forward and fast reverse. The flowchart of FIG. 6 shows an operation flow of the playback control unit 172 during high-speed playback. The operation of the demultiplexer 11a during high-speed playback is the same as that in FIG.

  (A) In step S299, the reproduction control unit 172 determines whether or not a high-speed reproduction stop instruction has been issued. If a fast playback stop command is instructed, the fast playback is terminated. If there is no instruction for a fast playback stop command, the process proceeds to step S300.

  (B) In step S300, when the second playback buffer area 134 is empty, the playback control unit 172 reads the management table data from the storage unit 18 to the second playback buffer area 134. Further, referring to the read management table data, the head TS packet position of the I picture or the I and P pictures is detected.

  (C) In step S301, the playback control unit 172 sends data for the size specified separately from the first TS packet of the I picture (or P picture) from the storage unit 18 via the data bus 60 to the first playback buffer. Control is performed so that the area 132 is stored. Here, the size may be the data size up to the TS packet including the head of the next picture. Next, the process returns to step S299.

  As described above, according to the first embodiment of the present invention, a stream is recorded while being scrambled, and a management table is created at the first (first) reproduction, thereby fast-forwarding and fast-rewinding at the second and subsequent reproductions. It is possible to provide a digital broadcast recording / reproducing apparatus 1a capable of performing processing. Therefore, the content copy protection function can be realized and fast-forwarding cannot be performed at the time of the first reproduction, so that the user can view the commercial (CM) without skipping. Further, since it is not necessary to perform encryption inside the receiver during recording, the control during recording can be simplified.

(First modification of the first embodiment)
As a first modification of the first embodiment of the present invention, as shown in FIG. 7, when the stored partial TS is played back for the first time, the playback control unit 172 plays back the stored partial TS. In order to selectively reproduce the packet including the video data reproduced at least once with reference to the management table up to at least one of the extraction unit 111, the descrambling unit 112, the management table creation unit 113, and the storage unit 18. Control one. That is, the playback control unit 172 selectively reads TS packets from the storage unit 18 with reference to the management table up to the time when the partial TS is played back at the first playback of the partial TS.

  First, with reference to a flowchart shown in FIG. 7, an example of a procedure for executing a fast reverse process during the first reproduction will be described. The flowchart of FIG. 7 shows an operation flow of the playback control unit 172 when the fast reverse process is executed during the first playback.

  (A) In step S400, the playback control unit 172 receives a fast reverse command during the first playback.

  (B) In step S401, the reproduction control unit 172 holds the count value of the number of TS packets transferred up to step S400.

  (C) In step S399, the playback control unit 172 determines whether or not a fast reverse stop command has been instructed. When the fast reverse stop command is instructed, the reproduction is finished. If there is no fast reverse stop instruction, the process proceeds to step S402.

  (D) In step S402, the playback control unit 172 refers to the management table being created.

  (E) In step S402, the reproduction control unit 172 connects the data bus 60 from the bit stream storage area 181 in the storage unit 18 to the first reproduction buffer area 132 when the first reproduction buffer area 132 is free. Through which the I picture (and P picture) is read out. Next, the process returns to step S399.

  Next, referring to a flowchart shown in FIG. 8, an example of a processing procedure in a case where fast reverse is executed at the time of the first reproduction and then fast forward is performed will be described. The flowchart of FIG. 8 shows an operation flow of the playback control unit 172 when the fast reverse process is realized at the time of the first playback.

  (A) In step S500, the playback control unit 172 receives a fast reverse command during the first playback.

  (B) In step S499, the playback control unit 172 determines whether a fast-forward stop command is instructed. If a fast-forward stop command is instructed, playback is terminated. When the fast-forward stop command is not instructed, the process proceeds to step S501.

  (C) In step S501, the reproduction control unit 172 holds the count value of the number of TS packets transferred up to step S500.

  (D) In step S502, the reproduction control unit 172 determines whether there is data to be newly read in the management table. When it is determined that there is no data to be newly read in the management table, the process proceeds to step S504, and the fast-forward process ends. If it is determined that there is data to be newly read in the management table, the process proceeds to step S503.

  (E) In step S503, the playback control unit 172 refers to the management table being created, and if there is a free space in the first playback buffer area 132, the playback control section 172 starts from the bitstream storage area 181 to the first playback buffer area 132. I picture (and P picture) are read out. Next, the process returns to step S499.

  Thus, according to the first modification of the first embodiment of the present invention, fast forward and fast reverse processing can be realized within the range in which the management table is created even during the first reproduction. In addition, at the time of the first reproduction, fast forward cannot be performed in the future direction where the management table does not exist, so that it is possible to avoid skipping CMs or the like at the time of the first reproduction.

(Second modification of the first embodiment)
FIG. 9 shows a digital broadcast recording / reproducing apparatus 1b according to a second modification of the first embodiment of the present invention. In the second modification of the first embodiment, the partial TS accumulated in the bit stream storage area 181 in the accumulation unit 18 by the reproduction control unit 172 is transferred to the first reproduction buffer area 132 in the memory 13 via the data bus 60. To control reading. Further, the playback control unit 172 controls the partial TS to be read from the first playback buffer area 132 to the playback control unit 20 via the data bus 60 and is subjected to rate control so as to be input to the input selection unit 19. The input selection unit 19 selects any partial TS input from the receiving device 3 and the reproduction control unit 20 and inputs the selected partial TS to the demultiplexer 11a.

  According to the digital broadcast recording / reproducing apparatus 1a according to the second modification of the first embodiment, the processing of the demultiplexer 11a can be simplified by unifying the partial TS input to the demultiplexer 11a in one place. . Furthermore, by providing the playback control unit 20 individually, the partial TS read from the storage unit 18 can be transferred to another device.

(Second Embodiment)
A digital broadcast recording / reproducing apparatus 1c according to the second embodiment of the present invention is different from FIG. 1 in that a demultiplexer 11b further includes an encryption unit 114 and a decryption unit 115, as shown in FIG. The encryption unit 114 encrypts the descrambled partial TS. The decryption unit 115 decrypts the partial TS encrypted by the encryption unit 114. The control unit 17a performs encryption when the stored partial TS is reproduced for the first time, and performs decryption when the reproduction is performed for the second time or later. Therefore, the extraction unit 111, the descrambling unit 112, the management table creation unit 113, And at least one of the storage units 18 is controlled. Other configurations are the same as those of the digital broadcast recording / reproducing apparatus 1a shown in FIG.

  Therefore, the digital broadcast recording / reproducing apparatus 1c that can decrypt the TS packet read from the storage unit 18 without referring to the control data (key data) for descrambling is configured. Further, each digital broadcast recording / reproducing apparatus 1c is provided with an encryption key, and the encryption unit 114 encrypts the TS packet so that it cannot be reproduced even if the storage unit 18 is transferred to another device. Can comply with the content protection regulations.

  Next, an example of the first reproduction processing procedure in the digital broadcast recording / reproducing apparatus 1c shown in FIG. 10 will be described with reference to the flowchart shown in FIG. However, the description which overlaps with the example of the 1st reproduction | regeneration processing procedure in the digital broadcast recording / reproducing apparatus 1a shown in FIG. 1 is abbreviate | omitted.

  (A) In step S203, the extraction unit 111 determines whether the TS packet to be played is scrambled. If it is determined that the TS packet to be reproduced is scrambled, the process proceeds to step S204. If it is determined that the TS packet to be played back is not scrambled, the process proceeds to step S600.

  (B) In step S600, the encryption unit 114 controls to encrypt all or part of the payload in the TS packet and temporarily store it in the first recording buffer area 131 via the data bus 60.

  (C) In step S205, the extraction unit 111 determines whether the content of the payload of the TS packet before encryption is video data. If it is determined that the content of the payload of the TS packet before encryption is video data, the process proceeds to step S206. If it is determined that the content of the payload of the TS packet before encryption is not video data, the process proceeds to step S207.

  As described above, according to the second embodiment of the present invention, the recorded TS packet can be reproduced without referring to the descrambling control data (key data) during reproduction after the encryption process. Furthermore, by recording a stream while being scrambled and creating a management table during the first playback, it is possible to provide a digital broadcast recording / playback apparatus 1c that can perform fast forward and fast reverse processing during the second and subsequent playback.

(Other embodiments)
As described above, the present invention has been described according to the first and second embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the first and second embodiments described above, an example using MPEG2-TS has been described. However, the transmission standard is not limited to MPEG2-TS, and any transmission standard that performs multiplexing using packets may be used. That is, the video decoder 14 is not limited to MPEG2, but MPEG4 or H.264. A video decoder conforming to a compression encoding method such as H.264 can be used. The same applies to the audio decoder 15.

  In addition, although it has been described that a hard disk can be used as the storage unit 18, an optical storage medium such as an optical disk or a large-capacity storage medium such as a nonvolatile semiconductor memory may be used.

  Furthermore, although an example in which the packet number is used as the position information of the TS packet including video data has been described, the start position of the recorded picture such as the number of bytes or the number of sectors in the hard disk drive (HDD) is used instead of the packet number. Any data that can be discriminated may be used.

  Further, although an example of receiving a digital broadcast signal transmitted wirelessly has been described, the configuration is not limited to the case where the digital broadcast signal is wirelessly transmitted, and may be configured to be wired.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

It is a block diagram which shows the structural example of the digital broadcast receiving system which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows an example of each packet recorded on the storage device which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows an example of the management table which the management table preparation part which concerns on 1st Embodiment of this invention produces. It is a flowchart which shows the example of a procedure of the recording process in the digital broadcast recording / reproducing apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the example of a procedure of the 1st reproduction | regeneration processing in the digital broadcast recording / reproducing apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the example of a procedure of the high-speed reproduction | regeneration processing in the digital broadcast recording / reproducing apparatus concerning 1st Embodiment of this invention. It is a flowchart which shows the example of a procedure of the rewinding process in the 1st reproduction | regeneration processing in the digital broadcast recording / reproducing apparatus which concerns on the 1st modification of 1st Embodiment of this invention. It is a flowchart which shows the example of a procedure of the fast-forward process after the fast reverse process in the 1st reproduction | regeneration process in the digital broadcast recording / reproducing apparatus which concerns on the 1st modification of 1st Embodiment of this invention. It is a block diagram which shows the structural example of the digital broadcast receiving system which concerns on the 2nd modification of 1st Embodiment of this invention. It is a block diagram which shows the structural example of the digital broadcast receiving system which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the example of a procedure of the 1st reproduction | regeneration processing in the digital broadcast recording / reproducing apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a-1c ... Digital broadcast recording / reproducing apparatus 18 ... Storage apparatus 111 ... Extraction part 112 ... Descramble part 113 ... Management table preparation part 17a, 17b ... Recording control part

Claims (5)

An extraction unit that extracts each packet belonging to a desired program from a bitstream including a plurality of packets including at least one piece of information;
A descrambling unit for descrambling each packet belonging to the desired program;
The unique information is detected from the packets including specific information among the packets belonging to the desired program, the position information of the packet including the specific information is calculated, and the correlation between the specific information and the position information is indicated. A management table creation unit for creating a management table;
An accumulator for accumulating each packet belonging to the desired program and the management table;
Controls at least one of the extraction unit, the descrambling unit, the management table creation unit, and the storage unit to create the management table when each packet belonging to the stored desired program is reproduced. A digital broadcast recording / reproducing apparatus comprising: a control unit.   The control unit creates the management table at the first playback of each packet belonging to the stored desired program, so that the extraction unit, the descrambling unit, the management table creation unit, and the storage The digital broadcast recording / reproducing apparatus according to claim 1, wherein at least one of the units is controlled.   The control unit refers to the management table and selectively reproduces the packet including the specific information when each packet belonging to the stored desired program is reproduced for the second time or later. The digital broadcast recording / reproducing apparatus according to claim 2, wherein at least one of the extraction unit and the storage unit is controlled.   The control unit refers to the management table up to a point of time when each packet belonging to the stored desired program is played back when each packet belonging to the stored desired program is reproduced for the first time. Controlling at least one of the extraction unit, the descrambling unit, the management table creation unit, and the storage unit in order to selectively reproduce the packet including the specific information reproduced at least once. The digital broadcast recording / reproducing apparatus according to claim 2, wherein: An encryption unit for encrypting each packet belonging to the desired program descrambled by the descrambling unit;
A decrypting unit that decrypts each packet belonging to the desired program encrypted by the encryption unit, and the control unit reproduces each stored packet belonging to the desired program. In order to perform the encryption in the first time and to perform the decryption in the second time or later, at least one of the extraction unit, the descrambling unit, the management table creation unit, and the storage unit is provided. 5. The digital broadcast recording / reproducing apparatus according to claim 1, wherein the digital broadcast recording / reproducing apparatus is controlled.

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