JP5581661B2 - Digital broadcast playback device - Google Patents

Description

  The present invention relates to a digital broadcast reproduction apparatus.

  The digital broadcast reproduction device demodulates and decodes the digital broadcast information received from the receiver that receives the digital broadcast into viewable information. For example, in Japan, digital broadcasting is performed by dividing the frequency band for one channel into 13 parts. Each divided area is called a segment. When one-segment broadcasting is operated, full-segment broadcasting is broadcast using 12 segments out of 13 divided segments. For example, assuming that the bit rate of full seg broadcasting is 16 Mbps, when storing full seg broadcast data which is digital broadcast information of full seg broadcast for one hour, the storage device needs to have a storage capacity of at least 7.2 GB.

  As an operational form of digital broadcasting, there is simultaneous broadcasting in which the same program is broadcast simultaneously in full-segment broadcasting and one-segment broadcasting. In simulcasting, one-segment broadcasting corresponding to full-segment broadcasting is broadcast using one segment that is not used in full-segment broadcasting among the 13 divided segments. Since one-segment broadcasting has fewer segments than full-segment broadcasting, the amount of data that can be transmitted per unit time is also small. For example, assuming that the bit rate of one-segment broadcasting is about 400 kbps, when one-segment broadcasting data that is digital broadcasting information of one-segment broadcasting is stored for one hour, the storage capacity necessary for the storage device is 180 MB. That is, the storage capacity required for storing the one-segment broadcast data is 1/40 compared to storing full-segment broadcast data.

  By storing the digital broadcast in a randomly accessible storage device such as an HDD (Hard Disk Drive) or a memory, time shift reproduction is possible. Time-shifted reproduction is a method in which digital broadcast data received while digital broadcast viewing is interrupted is temporarily stored in a storage device, and the temporarily stored data is fast-forwarded and reproduced until real-time viewing is resumed after viewing is resumed.

  When trying to realize time-shifted reproduction, in a small device such as a portable terminal, the storage capacity of a storage device that can be mounted is limited by the size of the housing. When it is difficult to store full-seg broadcast data due to storage area limitations, real-time viewing is performed using full-seg broadcast data, and broadcasts for which viewing is suspended are stored using one-seg broadcast data. As a result, the amount of data stored for realizing time shift reproduction can be reduced.

  The following patent documents disclose techniques relating to time shift reproduction.

Japanese Patent Laid-Open No. 2001-216731 Japanese Patent Laid-Open No. 2007-43358 Japanese Patent Laid-Open No. 2007-251867

  A broadcasting station that transmits simulcast data performs encoding processing and modulation processing on the broadcast content for one-segment broadcasting and full-segment broadcasting, respectively, and transmits the broadcasting data. Due to the difference in encoding processing and modulation processing between one-segment broadcasting and full-segment broadcasting, the one-segment broadcasting data is transmitted later than the corresponding full-segment broadcasting data. Due to this transmission delay, if a video during full-segment broadcast viewing interruption is stored as one-segment broadcast data and time-shifted reproduction is performed, a time lag occurs when the time-shift reproduction of the one-segment broadcast data returns to real-time full-segment broadcast reception.

  An object of an embodiment of the present invention is to provide a digital broadcast reproduction apparatus that can switch to real-time viewing without time lag from time-shift reproduction with an optimal storage capacity.

In order to solve the above-described problem, one program is received from a receiving unit that receives a digital broadcast that is simulcast by the first digital broadcast information and the second digital broadcast information that is transmitted later than the first digital broadcast information . , the first digital broadcast information includes first time management information is reproduction time information and the second digital broadcast information including the same second time management information and said first time management information at the same timing on the same program A digital broadcast reproducing device for reproducing reproduces the first digital broadcast information and extracts the first time management information, and reproduces the second digital broadcast information corresponding to the first digital broadcast information. And a second playback unit for extracting the second time management information, a storage unit for storing the received first digital broadcast information and the second digital broadcast information, When there is an instruction to interrupt viewing of digital broadcast information, the second digital broadcast information received by the receiving unit is written to the storage unit, and when there is an instruction to resume viewing, the second digital broadcast information written to the storage unit The second reproduction unit reproduces the digital broadcast information at a higher speed than normal viewing, and the first reproduction time based on the first time management information extracted from the received first digital broadcast information and the reproduced second digital the difference between the second reproduction time by said second time management information extracted from the broadcast information to write to the storage section of said first digital broadcasting information to start when it becomes below a first predetermined value, the received When the difference between the second playback times by the second time management information extracted from the second digital broadcast information and the reproduced second digital broadcast information is equal to or less than a second predetermined value , the information is written to the storage unit. The A control unit to be reproduced at a speed higher than the normal viewing an digital broadcasting information in said first reproducing unit.

  According to the embodiment, it is possible to provide a digital broadcast reproduction device that can switch to real-time viewing without causing a time lag from time shift reproduction with an optimal storage capacity.

1 is an overall block diagram of a digital broadcast playback device. It is a structure schematic diagram of digital broadcasting data. It is a flowchart figure of a time shift reproduction process. It is a timing chart figure of time shift reproduction. It is a time change figure of the unreproduced storage data amount in the memory | storage part.

  Hereinafter, this embodiment will be described. In addition, the combination of the structure in each embodiment is also contained in embodiment of this invention.

  FIG. 1 is an overall block diagram of a digital broadcast reproduction apparatus 10 according to the present embodiment. The digital broadcast reproduction apparatus 10 includes a one-segment tuner 1, a full-segment tuner 2, a one-segment demodulation unit 3, a full-segment demodulation unit 4, a one-segment reproduction unit 23, a full-segment reproduction unit 24, a selector 9, a selection storage control unit 11, a selective reproduction control unit 13, and a storage Unit 12 and control unit 14.

  The one-segment tuner 1 selects and outputs a one-segment broadcast of a channel assigned to one frequency band from the received one-segment broadcast. The full segment tuner 2 selects and outputs the full segment broadcast corresponding to the channel selected by the one segment tuner 1 from the received full segment broadcast.

  The one seg demodulator 3 demodulates the one seg broadcast of the channel selected by the one seg tuner 1 into a digital signal. Similarly, the full segment demodulator 4 demodulates the full segment broadcast of the channel selected by the full segment tuner 2 into a digital signal.

  The one seg reproduction unit 23 reproduces the one seg broadcast data and extracts a PTS (Presentation Time Stamp) that is reproduction time information of the one seg broadcast data. PTS is time management information at the time of data reproduction. The one-segment playback unit 23 includes a one-segment demax 5 and a one-segment decoding unit 7. The PTS will be described in detail according to the schematic configuration diagram of FIG.

  FIG. 2 is a schematic configuration diagram of a broadcast data structure in digital broadcasting. In FIG. 2, TS (Transport Stream) is obtained by time-division multiplexing several individually encoded streams in transmission units called TS packets. Time division multiplexing is a method of dividing a transmission line by time in order to transmit a plurality of signals such as video and audio through one transmission line, and allocating a signal to each divided time and transmitting it. .

  A TS packet is a fixed-length packet that constitutes a TS. Each TS packet has a header and a payload. The header has an identification number called PID (Packet ID). The payload stores data. The value of PID differs depending on the type of data stored in the payload corresponding to each header. The digital broadcast reproduction apparatus 10 can filter TS packets corresponding to one PES packet from among a plurality of TS packets by PID.

  A PES (Packetized Elementary Stream) packet is a packetization of one ES (Elementary Stream). By connecting the payloads of TS packets having the same PID, a PES packet having one ES can be extracted. The one-segment demux 5 and the full-segment demux 6 in FIG. 1 extract the PES packet.

  A PES packet has a PES header and an ES. The PES header has a PTS (Presentation Time Stamp). PTS is time management information at the time of reproduction. 1 seg demax 5 and full seg demax 6 extract PTSs 20 and 22 from the PES packet.

  Since time information is assigned to PTSs in chronological order, the time at which video data and audio data in each PES packet should be reproduced can be grasped by comparing the PTS size relationship.

  Returning to the description of FIG. The one seg demux 5 separates the demodulated one seg broadcast data output from the one seg demodulation unit 3 or the selective reproduction control unit 13 according to the control signal 19 for each type of data such as video and audio. The one seg demax 5 can perform separation processing at a higher reproduction speed than that in the case of real-time viewing when processing the one seg broadcast data output from the selective reproduction control unit 13 according to the control signal 19.

  The one seg demax 5 extracts a PTS value from the received one seg broadcast data and outputs it as a PTS 20 to the control unit 14. The PTS 20 may be a difference value of the PTS values of the one-segment broadcasting data received from the one-segment demodulating unit 3 and the selective reproduction control unit 13, or may be the respective PTS values. Further, in this embodiment, the PTS is extracted by the one-segment demax 5, but may be extracted by the one-segment decoding unit 7 described later.

  The one-seg decoding unit 7 adjusts the timing between data such as video and audio separated from the one-seg broadcast data, rearranges the data into viewable data, and outputs the data. The one-segment decoding unit 7 may be provided with a storage unit such as a memory that temporarily stores the decoded one-seg broadcast data. By temporarily storing the decoded one-segment broadcasting data, processing delay when switching from full-segment viewing to one-segment viewing can be eliminated.

  The full segment reproduction unit 24 reproduces full segment broadcast data and extracts PTS which is reproduction time information of the full segment broadcast data. The full segment reproduction unit 24 includes a full segment demax 6 and a full segment decoding unit 8.

  The full segment demax 6 is a separation unit that separates the demodulated full segment broadcast data for each type of data such as video and audio. The full segment demux 6 separates the full segment broadcast data output from the full segment demodulator 4 or the selective reproduction controller 13 in accordance with the control signal 21. When the full segment broadcast data output from the selective reproduction control unit 13 is processed according to the control signal 21, the full segment demax 6 can perform separation processing at a higher reproduction speed than that in the case of real-time viewing.

  Full seg demux 6 extracts a PTS value from the received full seg broadcast data and outputs it as a PTS 22 to the control unit 14. The PTS 22 may be a difference value of the PTS values of the full segment broadcast data received from the full segment demodulation unit 4 and the selective reproduction control unit 13, or may be the respective PTS values.

  The full-seg demux 6 may have a storage unit such as a memory for temporarily storing the processed full-seg broadcast information before switching from the time-shift reproduction of the one-segment broadcast information to the time-shift reproduction of the full-seg broadcast information. By temporarily storing the processed full seg broadcast data, it is possible to eliminate processing delay when switching from one seg viewing to full seg viewing.

  Further, in this embodiment, the PTS is extracted by the full segment demux 6, but may be extracted by the full segment decoding unit 8 described later.

  The full segment decoding unit 8 adjusts the timing between data such as video and audio separated from the full segment broadcast data, rearranges the data into viewable data, and outputs the data. The full segment decoding unit 8 may have a storage unit such as a memory for temporarily storing the decoded full segment broadcast data. By temporarily storing the decoded full-segment broadcast data, it is possible to eliminate processing delay when switching from one-segment viewing to full-segment viewing.

  The selector 9 selects the decoded broadcast data output from the one-segment decoding unit 7 or the full-seg decoding unit 8 according to the selection signal 15 output from the control unit 14, and outputs the selected broadcast data to an output device such as a monitor.

  The selection storage control unit 11 selects either one of the one-segment demodulation unit 3 and the full-segment demodulation unit 4 according to the selection signal 16 output from the control unit 14 and stores the selected output in the storage unit 12.

  The storage unit 12 stores the demodulated broadcast data output from the selection storage control unit 11. In the present embodiment, one-segment broadcasting data or full-segment broadcasting data before demax processing is stored, but data after demax processing may be stored. By storing the data after demaxing, the amount of data stored in the storage unit 12 can be reduced.

  The selective reproduction control unit 13 reads the one-segment broadcast data or the full-segment broadcast data from the storage unit 12 according to the selection signal 17 output from the control unit 14. The selective reproduction control unit 13 transmits the read data to the one seg demax 5 when the one seg broadcast data is read. The selective reproduction control unit 13 transmits the read data to the full segment demux 6 when the full segment broadcast data is read.

  The control unit 14 causes the storage unit 12 to store the one-segment broadcast data received after the viewing is interrupted. The control unit 14 causes the one-segment reproduction unit 23 to perform time-shift reproduction of the one-segment broadcast data stored when viewing is resumed at a higher speed than normal viewing. The control unit 14 starts storing the full-segment broadcasting data before the first time when the one-segment broadcasting data that has been time-shifted reproduced based on the extracted PTS 20 and PTS 22 catches up with the full-segment broadcasting that is being received. The control unit 14 causes the full-segment broadcast unit 24 to perform time-shift reproduction of the full-segment broadcast data stored in the storage unit 12 at a time when the one-segment broadcast data that has been time-shift reproduced based on the PTS 20 catches up with the one-segment broadcast being received. Details of the operation of the control unit 14 will be described with reference to the flowchart of FIG.

  FIG. 3 is a flowchart of time-shift playback processing in the digital broadcast playback device 10. In the digital broadcast reproduction device 10, the control unit 14 outputs a selection signal 15 to the selector 9 so as to output the full segment broadcast data output from the full segment reproduction unit 24 (S10). The output of full-segment broadcasting data continues until the user instruction signal 18 for interrupting viewing is input (S11, NO).

  When the viewing instruction user instruction signal 18 is input to the control unit 14 (S11, YES), the control unit 14 outputs a selection signal 16 for starting one-segment recording to the selection storage control unit 11 (S12). The selection storage control unit 11 selects the one seg broadcast data output from the one seg demodulation unit 3 according to the selection signal 16 and outputs it to the storage unit 12.

  The one-segment recording is continued until a user instruction signal 18 for instructing to resume viewing is input (S13, NO). When the user instruction signal 18 for instructing to resume viewing is input to the control unit 14 (S13, YES), the control unit 14 sends a selection signal 17 for starting time-shifted reproduction with the one-segment broadcast data to the selective reproduction control unit 13. Output. The selection / reproduction control unit 13 selects the one-segment broadcasting data stored in the storage unit 12 as reproduction data according to the selection signal 17 and outputs the data to the one-segment demax 5 (S14). The control unit 14 selects the one-segment broadcasting data output from the selective reproduction control unit 13, and outputs a control signal 19 to the one-segment demax 5 so as to be output at a transfer rate corresponding to time shift reproduction (S14). The control unit 14 outputs the selection signal 15 to the selector 9 so as to select and output the one seg broadcast data output from the one seg decoding unit 7 (S14).

  The PTS value extracted by the full segment demax 6 based on the full segment broadcast data being received from the full segment demodulator 4 in real time is defined as PTS1. The PTS value extracted by the one seg demux 5 based on the one seg broadcast data output from the selective reproduction control unit 13 is defined as PTS2. The control unit 14 continues the one-segment reproduction until the difference between PTS1 and PTS2 (PTS1−PTS2) becomes equal to or less than the threshold value 1 set in advance in the control unit 14 (S15, NO).

  The threshold value 1 is a value set in advance in the control unit 14. When the time lag between the full-segment broadcasting data and the one-segment broadcasting data is TD and the fast-forwarding magnification of the time shift reproduction speed is S, the threshold value 1 is a value based on TD × S. That is, the time during which the PTS difference is less than or equal to the threshold value 1 is calculated based on the playback speed of time-shift playback and the time lag between the full segment broadcast information and the one segment broadcast information. When there is an offset in the PTS corresponding to video and audio data at the same timing on the same program of full-segment broadcasting and one-segment broadcasting, a threshold value taking this offset into account is set. Further, the threshold value 1 may be set with a margin in consideration of the display time of the output data, the decoding processing delay time, and the like.

  Note that, as a criterion for determining whether or not the PTS difference is equal to or less than the threshold value 1, an unreproduced one-segment broadcast data amount stored in the storage unit 12 may be used. From the fast-forwarding magnification S of the time shift reproduction speed, it is possible to predict how much the unreproduced one-segment broadcast data amount will become zero later. That is, the time during which the PTS difference is equal to or less than the threshold value 1 is calculated based on the unreproduced one-segment broadcasting information stored in the storage unit 12 and the reproduction speed of time shift reproduction. By setting the threshold value 1 according to the time when the one-segment broadcast data amount becomes zero, it is possible to determine the timing for switching the operation to the storage of the full-segment broadcast data as in the case of comparing the PTS differences.

  When the difference between PTS1 and PTS2 (PTS1-PTS2) becomes equal to or less than the threshold 1 (S15, YES), the control unit 14 outputs a selection signal 16 for starting full segment recording (S16). The selection storage control unit 11 selects the full segment broadcast data output from the full segment demodulation unit 4 and outputs it to the storage unit 12 (S16).

  The PTS value extracted by the one seg demax 5 based on the one seg broadcast data being received from the one seg demodulator 3 in real time is assumed to be PTS3. The control unit 14 continues the time-shifted reproduction of the one-segment broadcast data until the difference between PTS3 and PTS2 (PTS3−PTS2) becomes equal to or less than the threshold 2 preset in the control unit 14 (S17, NO). When (PTS3-PTS2) becomes equal to or less than the threshold value 2 (S17, YES), the control unit 14 outputs a selection signal 17 for starting time shift reproduction with full-segment broadcast data to the selective reproduction control unit 13 (S18).

  The threshold 2 is a value set in advance in the control unit 14. The timing for switching to time shift playback using full segment broadcast data is the timing at which one segment time shift playback catches up with one segment real time viewing. Therefore, the value of threshold 2 is 0. The actual threshold 2 is set to a value that takes into account the processing time for switching from one segment time shift reproduction to full segment time shift reproduction.

  When receiving the selection signal 17 from the control unit 14, the selective reproduction control unit 13 selects the full segment broadcast data output from the storage unit 12 and outputs it to the full segment demax 6 (S18). The control unit 14 selects the full segment broadcast data output from the selective reproduction control unit 13, and outputs the control signal 21 to the full segment demax 6 so as to output the broadcast data at a transfer rate corresponding to time shift reproduction (S18). . The control unit 14 outputs a selection signal 15 for switching to full segment broadcasting (S18). Upon receipt of the selection signal 15, the selector 9 selects and outputs the full segment broadcast data output from the full segment decoding unit 8 (S18).

  Let PTS4 be a PTS value that is extracted by the full segment demux 6 based on the full segment broadcast data output from the selective reproduction control unit 13. The control unit 14 continues the time-shifted reproduction of the full segment broadcast data until the difference between the PTS1 and the PTS4 (PTS1−PTS4) becomes equal to or less than the threshold value 3 preset in the control unit 14 (S19, NO).

  The threshold 3 is a value set in advance in the control unit 14. The timing for switching to real-time viewing is the timing at which full-segment time-shifted playback catches up with full-segment viewing. Therefore, the value of threshold 3 is 0. The threshold 3 may be set in consideration of processing time for switching from full segment time shift reproduction to full segment real time viewing.

  When (PTS1-PTS4) becomes equal to or less than the threshold 3 (S19, YES), the control unit 14 outputs a control signal 21 for switching from time shift reproduction to real-time full segment viewing to the full segment demax 6 (S20). The full segment demux 6 selects and outputs the full segment broadcast data output from the full segment demodulator 4 according to the control signal 21 (S18).

  In other words, the full-segment broadcast data received from the one-segment tuner 1 and the full-segment tuner 2 that receive the digital broadcast and the digital broadcast reproduction device that reproduces the one-segment broadcast data are reproduction time information included in the full-segment broadcast data while reproducing the full-segment broadcast data. A full segment reproduction unit 24 that extracts the PTS 22, a one segment reproduction unit 23 that reproduces the one segment broadcast data corresponding to the full segment broadcast data and extracts PTS 20 that is reproduction time information included in the one segment broadcast data, and the received full segment broadcast data and The storage unit 12 that stores the one-segment broadcasting data, and the one-segment broadcasting data received by the one-seg tuner 1 when the instruction to stop viewing is given, are written to the storage unit 12, and when the instruction to resume viewing is given, the writing is made to the storage unit 12. One Seg broadcasting Data is played back at a higher speed than normal viewing by the one-segment playback unit 23, and the reproduced one-segment broadcast data is being received based on the PTS 22 extracted from the received full-segment broadcast data and the PTS 20 extracted from the reproduced one-segment broadcast data. Based on the PTS 20 extracted from the received one-seg broadcast data and the reproduced one-seg broadcast data, starting to write the full-seg broadcast data to the storage unit 12 one hour before the time estimated to catch up with the full-seg broadcast data. When the reproduced one-segment broadcast data catches up with the currently received one-segment broadcast data, the full-segment broadcast data written to the storage unit 12 is reproduced by the full-segment reproduction unit 24 at a higher speed than normal viewing.

  As described above, time-shift playback is performed on recorded 1Seg broadcast data, and full-seg broadcast data is recorded and played back so as to interpolate the time lag between 1Seg broadcast and full-seg broadcast, thereby reducing the time lag from time-shift playback with optimal storage capacity. It is possible to provide a digital broadcast reproduction device that switches to real-time viewing without occurring.

  The digital broadcast reproduction apparatus 10 can also execute the processing shown in FIG. 3 as processing of a program by the processor by mounting a processor that executes the processing shown in FIG.

  FIG. 4 shows a timing chart of time shift reproduction when the processing of the flowchart of FIG. 3 is performed. The time on the horizontal axis is divided from section A to section F according to the storage state and output state of broadcast data.

  In FIG. 4, the full segment received data 40 is data output from the full segment demodulator 4 to the full segment demax 6. The numbers from “0” to “28” in the data represent the display times of the full segment received data 40.

  The one-segment received data 41 is data output from the one-segment demodulator 3 to the one-segment demax 5. The numbers from “−3” to “25” in the data represent the display times of the one-segment received data 41, respectively. One-segment received data 41 and full-segment received data 40 having the same number correspond to video and audio data at the same timing on the program.

  The full segment storage data 42 is full segment broadcast data temporarily stored in the storage unit 12. The storage unit 12 stores full segment broadcast data from time T3 to time T5 as full segment storage data 42.

  The one seg storage data 43 is one seg broadcast data temporarily stored in the storage unit 12. The storage unit 12 stores the one seg broadcast data from time T1 to time T4 in the storage unit 12 as full segment storage data 42.

  The output data 44 indicates broadcast data output from the selector 9. The operation of each section will be described below with the timing chart of FIG. 4 corresponding to the step numbers in the flowchart of FIG.

  In section A, the selector 9 outputs the full-segment broadcasting data being viewed as output data 44 (S10).

  When viewing is interrupted at time T1 (S11, YES), the storage unit 12 stores the one-seg broadcast data being received in the section B as the one-seg storage data 43 (S12). Therefore, the unreproduced data stored in the storage unit 12 gradually increases.

  When viewing is resumed at time T2 (S13, YES), the selective reproduction control unit 13 outputs the one seg broadcast data stored in the storage unit 12 as the one seg storage data 43 to the one seg reproduction unit 23 (S14). In section C, the selector 9 outputs, as output data 44, one-segment broadcast data that has been time-shifted reproduced by the one-segment reproduction unit 23. Therefore, unreproduced data stored in the storage unit 12 in the section C gradually decreases.

  At the time T3 when the difference between the PTS output from the one segment demax 5 and the PTS output from the full segment demax 6 is equal to or less than the threshold value 1 (S15, YES), the storage unit 12 performs the full segment broadcast data as the full segment storage data 42. Is stored (S16). In the section D, the full segment broadcast data stored in the storage unit 12 gradually increases. On the other hand, in the section D, the selector 9 outputs the one-segment broadcasting data that has been time-shifted and reproduced as output data 44. The amount of full-segment broadcasting data per unit time is larger than the amount of one-segment broadcasting data. Therefore, the unreproduced data stored in the storage unit 12 in the section D gradually increases.

  At the time T4 when the difference between the PTS value of the one seg broadcast data output from the one seg demodulation unit 3 and the PTS value of the one seg broadcast data output from the selective reproduction control unit 13 is equal to or less than the threshold 2 (S17, YES), selective reproduction The control unit 13 outputs the full-segment broadcasting data stored in the storage unit 12 at a higher speed than usual as the output data 44 (S18). Therefore, unreproduced data stored in the storage unit 12 in the section E gradually decreases.

  At time T5 when the difference between the PTS value of the full-segment broadcast data being received and the PTS value of the full-segment broadcast data that has been time-shifted is equal to or less than the threshold value 3 (S19, YES), the control unit 14 starts full-segment real-time from full-segment time-shift reproduction. Switching to viewing (S20). In section F, the selector 9 outputs the full-segment broadcast data being received as output data 44. Therefore, the amount of unreproduced stored data in the section F is zero.

  Time-shift playback is performed on the recorded 1Seg broadcast data as described above, and full-seg broadcast data is recorded and played back so as to interpolate the time lag between the 1Seg broadcast and the full-seg broadcast. It is possible to provide a digital broadcast reproduction device that switches to real-time viewing without occurring.

  FIG. 5 is a time change diagram of the amount of unreproduced stored data in the storage unit 12. The horizontal axis in FIG. 5 is time. Times T1, T2, T3, T4, and T5 in FIG. 5 correspond to times T1, T2, T3, T4, and T5 in FIG. 4, respectively.

  A graph 50 in FIG. 5 is a time change of the amount of unreproduced stored data in the storage unit 12 when all the digital broadcast data whose viewing is interrupted is stored as full segment broadcast data. In the graph 50, the amount of unreproduced stored data reaches a maximum value at time T2 when viewing is resumed.

  A graph 50 in FIG. 5 represents a change over time in the amount of stored data for viewing / reproduction in the storage unit 12 when the digital broadcast data is stored by the method according to the present embodiment. In this embodiment, the unreproduced stored data amount at time T4 is larger than the stored amount at time T2. The magnitude relationship between the amounts of unreproduced stored data at times T2 and T4 varies depending on the viewing interruption time.

  Comparing the graph 50 and the graph 51 at time T2, the unreproduced storage data amount in the graph 51 is 1/40 of the unreproduced storage data amount in the graph 50.

  Time-shift playback is performed on the recorded 1Seg broadcast data as described above, and full-seg broadcast data is recorded and played back so as to interpolate the time lag between the 1Seg broadcast and the full-seg broadcast. It is possible to provide a digital broadcast reproduction device that switches to real-time viewing without occurring.

1 One-Seg Tuner 2 Full-Seg Tuner 3 One-Seg Demodulation Unit 4 Full-Seg Demodulation Unit 5 One-Seg Demax 6 Full-Seg Demax 7 One-Seg Decoding Unit 8 Full-Seg Decoding Unit 9 Selector 10 Digital Broadcasting Playback Device 11 Selection Storage Control Unit 12 Storage Unit 13 Selective Playback Control Unit 14 Control unit 15, 16, 17 Selection signal 18 User instruction signal 20, 22 PTS
19, 21 Control signal 23 One-segment reproduction unit 24 Full-segment reproduction unit

Claims (6)

Reproduction time information received from a receiving unit that receives a digital broadcast that is simulcast by one digital broadcast information and the second digital broadcast information transmitted later than the first digital broadcast information . in the digital broadcasting reproducing apparatus for reproducing the second digital broadcast information including the same second time management information and said first time management information in the first digital broadcasting data and the same timing on the same program including one time management information There,
A first reproduction unit for reproducing the first digital broadcast information and extracting the first time management information;
A second reproduction unit that reproduces the second digital broadcast information corresponding to the first digital broadcast information and extracts the second time management information;
A storage unit for storing the received first digital broadcast information and the second digital broadcast information;
The second digital broadcast information received by the receiving unit is written to the storage unit when there is an instruction to suspend viewing of the first digital broadcast information, and is written to the storage unit when there is an instruction to resume viewing The second digital broadcast information is played back at a higher speed than normal viewing by the second playback unit, and the first playback time and the playback time based on the first time management information extracted from the received first digital broadcast information. writing to the storage unit of the first digital broadcast information begins when the difference between the second reproduction time by said second time management information extracted from the second digital broadcast information becomes less than a first predetermined value, When the difference between the second reproduction times by the second time management information extracted from the received second digital broadcast information and the reproduced second digital broadcast information is equal to or less than a second predetermined value , the storage is performed. Write to department Digital broadcasting reproducing apparatus characterized by a control unit to reproduce faster than normal view said first digital broadcasting information in said first reproducing unit's. The control unit further includes a difference between the first reproduction times based on the first time management information extracted from the received first digital broadcast information and the reproduced first digital broadcast information being equal to or less than a third predetermined value. It characterized that you play said first digital broadcasting information received when it becomes a digital broadcasting reproducing apparatus according to claim 1. The control unit is under the direction of the viewer resumes, unplayed amount of data of the second digital broadcast information written in the storage unit, to zero in the case where the reproduced faster than normal viewing 2. The digital broadcast reproduction apparatus according to claim 1 , wherein the first digital broadcast information starts to be written into the storage unit at a time earlier than a predicted time .   The first playback unit has a storage unit for temporarily storing the first digital broadcast information that has been processed before switching from time shift playback of the second digital broadcast information to time shift playback of the first digital broadcast information. The digital broadcast reproducing apparatus according to claim 1, wherein Reproduction time information received from a receiving unit that receives a digital broadcast that is simulcast by one digital broadcast information and the second digital broadcast information transmitted later than the first digital broadcast information . the first digital broadcast information including one time management information and the second digital broadcast information including the same second time management information and said first time management information reproduced at the same timing on the same program, said first digital A first reproduction unit that reproduces broadcast information and extracts the first time management information; and a second reproduction unit that reproduces the second digital broadcast information corresponding to the first digital broadcast information and extracts the second time management information. A control method of a digital broadcast reproduction device having two reproduction units and a storage unit for storing the first digital broadcast information and the second digital broadcast information,
When there is an instruction to stop viewing the first digital broadcast information, the second digital broadcast information received by the receiving unit is written to the storage unit,
When there is an instruction to resume viewing, the second digital broadcast information written in the storage unit is played back at a higher speed than normal viewing by the second playback unit,
The difference between the first reproduction time based on the first time management information extracted from the received first digital broadcast information and the second reproduction time based on the second time management information extracted from the reproduced second digital broadcast information is writing to the storage unit of the first digital broadcast information to start when it becomes below a first predetermined value,
When the difference between the second reproduction times by the second time management information extracted from the received second digital broadcast information and the reproduced second digital broadcast information is equal to or less than a second predetermined value , the storage is performed. A control method for a digital broadcast reproduction device, wherein the first digital broadcast information written in the unit is reproduced at a higher speed than normal viewing by the first reproduction unit. Reproduction time information received from a receiving unit that receives a digital broadcast that is simulcast by one digital broadcast information and the second digital broadcast information transmitted later than the first digital broadcast information . the first digital broadcast information including one time management information and the second digital broadcast information including the same second time management information and said first time management information reproduced at the same timing on the same program, said first digital A first reproduction unit that reproduces broadcast information and extracts the first time management information; and a second reproduction unit that reproduces the second digital broadcast information corresponding to the first digital broadcast information and extracts the second time management information. A control program for a digital broadcast reproduction device having a second reproduction unit, a storage unit for storing the first digital broadcast information and the second digital broadcast information, and a computer ,
To the computer,
A function of writing the second digital broadcast information received by the receiving unit to the storage unit when there is an instruction to interrupt viewing of the first digital broadcast information;
A function of causing the second playback unit to play back the second digital broadcast information written in the storage unit when there is an instruction to resume viewing;
The difference between the first reproduction time based on the first time management information extracted from the received first digital broadcast information and the second reproduction time based on the second time management information extracted from the reproduced second digital broadcast information is a function to start writing to the storage unit of the first digital broadcast data if it becomes less than a first predetermined value,
When the difference between the second reproduction times by the second time management information extracted from the received second digital broadcast information and the reproduced second digital broadcast information is equal to or less than a second predetermined value , the storage is performed. A control program for causing the first playback section to play back the first digital broadcast information written in the section at a speed higher than normal viewing.

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