JP2009194851A - Image recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for arbitrarily establishing the initial position of a follow-up reproduction. <P>SOLUTION: An image recording and reproducing apparatus 100 is equipped with: a recorder 107 for memorizing a time-search management file controllable of a time-search information, in contrast to an imaging file for imaging a digital broadcast; an operating unit 102 for establishing the initial position of the follow-up reproduction in the arbitrary position of the time-search information; and a controller 101 for controlling the follow-up reproduction from its initial position established at the arbitrary position of the time-search information. By the control of the controller 101, the follow-up reproduction is performed from its initial position established at the arbitrary position of the time-search information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control technique in a recording / playback apparatus capable of recording the contents of a digital broadcast and playing it back as necessary.

  Recording and playback devices (generally called recorders) that receive and record digital broadcast programs record digital broadcast MPEG-TS (Motion Picture Experts Group-Transport Stream) in a compressed state. Or play back recorded files. Further, as a function installed in such a recording / playback apparatus, a function capable of playing back while recording (referred to as “chase playback”) is known (see, for example, Patent Document 1). According to this function, it is possible to continue the recording while reproducing the program being recorded from the beginning of the program without waiting for the end of the recording. Of course, it is possible to stop the playback halfway and watch the continuation later.

JP 2007-43358 A

  As described above, according to the chasing playback function installed in the conventional recording / playback apparatus, it is possible to continue recording while playing from the beginning of the program without waiting until the end of recording the program being recorded. Can be stopped halfway and you can see more later.

  However, according to the chasing playback function installed in the conventional recording / playback apparatus, the start position of chasing playback is limited to the beginning of the recording file and the digital broadcast viewing pause time, and the start position of chasing playback is The user cannot set it arbitrarily. Further, such a technique is not described in Patent Document 1 described above.

  An object of the present invention is to provide a technique that can arbitrarily set the start position of chasing playback.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  A representative one of the inventions disclosed in the present application will be briefly described as follows.

  That is, a recording unit capable of storing a time search management file that enables management of time search information corresponding to a recording file for recording a digital broadcast, and a start position of chasing playback at an arbitrary position of the time search information And a control unit that controls chasing playback from the start position of chasing playback set at an arbitrary position of the time search information. By the control of the control unit, it is possible to perform chasing playback from the start position of chasing playback set at an arbitrary position of the time search information.

  The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

  That is, the start position of chasing playback can be arbitrarily set.

1. Representative Embodiment First, an outline of a typical embodiment of the invention disclosed in the present application will be described. The reference numerals of the drawings referred to with parentheses in the outline description of the representative embodiments merely exemplify what are included in the concept of the components to which the reference numerals are attached.

  [1] A recording / playback apparatus (100) according to a typical embodiment of the present invention can manage time search information corresponding to a recording file for recording the digital broadcast. , A recording unit (107) that can store the time search information, an operation unit (102) that enables setting the start position of chasing playback at an arbitrary position of the time search information, and chasing playback set at an arbitrary position of the time search information And a control unit (101) for controlling the chasing playback from the start position.

  According to the above configuration, chasing playback from the chasing playback start position set at an arbitrary position of the time search information can be performed under the control of the control unit.

  [2] When a recording file is formed from the digital broadcast, data can be additionally recorded in the recording file for each designated number of packets.

  [3] A TS buffer (201) for temporarily storing the received digital broadcast, a first function (101) for determining whether data corresponding to the chasing playback start position exists in the TS buffer, When the data corresponding to the chasing playback start position exists in the TS buffer, the read position can be set in the TS buffer.

  [4] Including a second function (101) for determining whether or not the decoding unit for decoding the received digital broadcast has been normally decoded, and the position where the decoding has been normally performed is stored as the time search information. Can be configured.

  [5] A TS buffer (201) for temporarily storing the received digital broadcast can be provided. In this case, the control unit (101) is configured to start a recording start processing function for starting the digital broadcast recording, a recording processing function for the digital broadcasting recording process, and an end of the recording of the digital broadcast. And a chasing playback processing function for chasing playback from the chasing playback start position set at an arbitrary position in the time search information.

  [6] The processing by the recording start processing function includes a first process (502) for searching for IDR information for constituting a display image, and, if the IDR information exists, an IDR image from the IDR information. And a second process (504) for setting the read position, and a third process (505) for opening the recording file and the time search management file after the second process. be able to.

  [7] For the processing by the processing function during recording, a TS packet that is a digital broadcast is received and recorded in the TS buffer (604, 605), and in preparation for the reception of the next TS packet. , Including a fifth process (606) for updating the TS packet writing position in the TS buffer and a sixth process (607) for analyzing the data content of the TS packet and determining whether the TS packet is an IDR image. it can. Furthermore, in the processing by the processing function during recording, when the data of the acquired TS packet is an IDR image, the seventh processing (608) for saving IDR information and recording before recording in the recording file are performed. The eighth process (609) for determining whether the number of TS packets to be reached has reached the designated number of packets, and when the number of TS packets to be recorded has reached the designated number of packets, the TS A ninth process (610) for recording the packet in the recording file and a tenth process (611) for updating the reading position of the TS buffer in preparation for writing to the next recording file can be included. For the processing by the processing function during recording, the provisional end of the recording file being recorded is updated for the recorded TS packet in the recording file being recorded, and notification of the provisional end update of the recording file to the playback system is permitted. And an eleventh process (613) for determining whether or not it is present.

  [8] In the processing by the recording end processing function, the twelfth processing (702) for recording the TS packet to be recorded in the recording file being recorded and the end of the recording file that has been recorded are updated and stored. Including a thirteenth process (704) for recording existing IDR information as a time search point in the time search management file, a fourteenth process (705, 706) for closing the recording file, and closing the time search management file. Can do.

  [9] The processing by the chasing playback processing function includes the fifteenth processing (902, 903) for setting the position to start chasing playback at the beginning of the recording file being recorded and searching for the seek position, and the chasing playback. It is possible to include a sixteenth process (910) for determining whether or not start is instructed and starting chasing playback when instructed to start chasing playback.

  [10] In the fifteenth process, it is determined whether or not the specified seek position exists in the TS buffer. If the corresponding seek position is not in the TS buffer, the recorded file being recorded is recorded. When the read position is set in the TS buffer and the corresponding seek position exists in the TS buffer, a 17th process (1105, 1106, 1107) for setting the read position in the TS buffer can be included.

  [11] The control unit is formed by a microcomputer that executes a predetermined program, and the processing functions in the control unit can be realized by executing the program.

2. Next, the embodiment will be described in more detail.

<Embodiment 1>
In the following, a mobile terminal with a digital broadcast receiving function will be described as an example of a recording / playback apparatus that receives and records digital broadcasts and plays back. Here, the portable terminal is not limited to the one held by the user, but includes, for example, a portable terminal for in-vehicle use installed in an automobile.

  FIG. 1 shows an internal configuration of a mobile terminal 100 with a digital broadcast receiving function according to the first embodiment of the present invention (hereinafter may be abbreviated as “mobile terminal 100”). The portable terminal 100 with a digital broadcast reception function shown in FIG. 1 is not particularly limited, but includes a control unit 101, an operation unit 102, a channel selection unit 103, a broadcast reception antenna 104, a wireless communication unit 105, a communication transmission / reception antenna 106, a storage Unit 107, recorded file recording unit 108, video decoding unit 109, display unit 110, audio output unit 112, and internal timer 113.

  The control unit 101 is configured by a microcomputer including a CPU (Central Processing Unit) and the like, and a predetermined program is executed by the CPU, whereby the entire mobile terminal 100 can be controlled. In particular, various processing functions in the present invention are realized by executing predetermined programs in the CPU.

  The operation unit 102 includes a plurality of keys including number keys and function keys, and can give instructions from the user (viewer).

  The channel selection unit 103 is a tuner for selecting a digital broadcast received via the broadcast receiving antenna 104, demodulates the received digital broadcast signal, and outputs digital data. The wireless communication unit 105 is a modem that performs wireless communication such as CDMA (Code Division Multiple Access) via the communication transmitting / receiving antenna 106.

  The storage unit 107 can store an operation program of the control unit 101 and other various information. The recorded file recording unit 108 uses the received digital broadcast program for recording and saving. The storage unit 107 and the recording file recording unit 108 may be different memories such as a random access memory (RAM), or the storage unit 107 and the recording file recording are separated by dividing the storage area of one memory. The portion 108 may be formed. Further, a removable external storage medium such as a memory card may be used. For example, the recording file recording unit 108 may be an external storage medium, and the storage unit 107 may be configured by a RAM. By using the recording file recording unit 108 as an external storage medium so that a plurality of media can be replaced and used, many or long-time digital broadcast program data can be recorded.

  The video decoding unit 109 is a decoder that decodes the compressed video data, and the display unit 110 is a display such as a liquid crystal monitor that displays the video decoded by the video decoding unit 109. The audio decoding unit 111 is a decoder that decodes the compressed audio data, and the audio output unit 112 is a speaker, an earphone, or the like that outputs the audio decoded by the audio decoding unit 111.

  The display unit 110 may be a touch panel system that allows a user to input characters, numbers, and user instructions by touching the display screen with a pen or a finger. As a result, the user can use the operation unit 102 and the display unit 110 as input means in accordance with usage conditions and information to be input. Further, in order to reduce the size of the mobile terminal 100, the operation unit 102 can be omitted.

  In the above configuration, when a digital broadcast is received via the broadcast receiving antenna 104 and the channel selection unit 103, the digital broadcast is temporarily stored in the storage unit 107. The temporarily stored digital broadcast data is separated into compressed video data and compressed audio data under the control of the control unit 101. The compressed video data is decoded by the video decoding unit 109 and displayed on the display unit 110. The compressed audio data is decoded by the audio decoding unit 111 and output as audio by the audio output unit 112.

  The internal timer 113 counts the 27 MHz clock that is the basic clock of the mobile terminal 100 in the present embodiment. This basic clock is used for synchronization between a digital broadcast station and the portable terminal 100 that receives the digital broadcast, synchronization between video data to be displayed and audio data to be output.

  When recording a received digital broadcast program, digital data (TS format) of the digital broadcast is stored in the recording file recording unit 108.

  The digital data received via the communication antenna 106 and the wireless communication unit 105 is separated into character data such as mail and voice data such as a call under the control of the control unit 101. Character data such as e-mail is displayed on the display unit 110, and voice data such as a call is output as voice by the voice output unit 112. Further, under the control of the control unit 101, the data stored in the storage unit 107 and the like are read and transmitted as digital data via the wireless communication unit 105 and the communication transmitting / receiving antenna 106. An electronic program guide (EPG: Electronic Program Guide), which is a program guide for digital broadcasting, is also obtained using the communication transmitting / receiving antenna 106 and the wireless communication unit 105.

  In FIG. 1 and the subsequent drawings, only video and audio data are described, and captions, PCR (Program Clock Reference), and the like are omitted.

  FIG. 2 shows a configuration of a main part of the portable terminal 100 with a digital broadcast receiving function according to the present embodiment. The digital broadcast is received and recorded while viewing the received digital broadcast, or the received digital It is shown paying attention to the data flow of chasing playback that is played back from the recording file being recorded while recording the broadcast.

  The digital broadcast is received via the broadcast receiving antenna 104 and is tuned by the tuning unit (tuner) 103. The selected digital broadcast is temporarily stored in the TS buffer 201 in the storage unit 107 in the TS (Transfer Stream) format. Since the TS format is described in MPEG-2 Systems (ISO / IEC13818-1), description thereof is omitted here.

  The TS data temporarily stored in the TS buffer 201 is converted into a PES (Packetized Elementary Stream) of video data by a DEMUX (Demultiplexing) unit 202 which is a demultiplexing unit that separates the TS data in the control unit 101. The PES of video data is stored in the video ES buffer 203 in the storage unit 107, and the PES of audio data is stored in the audio ES buffer 204 in the storage 107. The video data stored in the video ES buffer 203 is decoded by the video decoding unit 109 and displayed on the display unit 110. The audio data stored in the audio ES buffer 204 is decoded by the audio decoding unit 111 and output as audio from the audio output unit 112.

  Video compression encoding of 1-segment broadcasting, which is digital broadcasting for portable terminals, is H.264. H.264 standard (MPEG-4 part10 AVC / H.264: International Standards Organization / International Electrotechnical Commission (ISO / IEC) Video Expert Group (MPEG) and International Telecommunication Union (ITU) Video Coding Expert Group Based on advanced coding and decoding technology jointly developed with (VCEG), and from IDR (Instantaneous Decoder Refresh) intra pictures (intra-picture coding pictures) Only be able to decrypt correctly.

  This IDR image information (position information from the beginning of the file, PTS (Presentation Time Stamp) information, etc.) is important information when the recorded file is played back from the middle, and special playback such as seek Referenced when doing. In this embodiment, the IDR information is sequentially stored in the IDR information storage unit 205 in the storage unit 107 from the start of digital broadcast reception.

  The information stored in the IDR information storage unit 205 is information regarding an IDR access unit that is an access unit including an IDR image, and includes a TS packet number from the beginning of the file, PTS information, an elapsed time from the beginning of the file, and an IDR image. It is composed of the number of TS packets necessary for display.

  When recording the received digital broadcast, IDR image information (position information from the beginning of the file, etc.) valid for the target recording data is also stored in the recording file recording unit 108 from the IDR information storage unit 205. .

  An MPX (Multiplexer) unit 206, which is a multiplexer unit, is a block for selecting a playback source. With this MPX unit 206, it is possible to select whether the digital broadcast being received is to be reproduced, or the file being recorded or the recorded file is to be reproduced.

  When receiving a digital broadcast and recording while viewing the received digital broadcast, the TS buffer 201 is selected under the control of the control unit 101, and the digital broadcast being received is reproduced.

  At the time of chasing playback, under the control of the control unit 101, the recording file recording unit 108 is selected, and playback is performed from a file being recorded or a recorded file. In any case, during recording, additional recording is sequentially performed from the TS buffer 201 to the recording file in the recording file recording unit 108.

  FIG. 3 shows a recording process procedure in the present embodiment.

  This recording process is based on the premise that the target digital broadcast is selected by the channel selection unit 103 and the MPEG-TS of the digital broadcast can be analyzed by the control unit 101.

  When the recording process is started (step 301), initial settings (step 302) such as securing the memory of each buffer, setting of the internal timer 113, setting of the write pointer of the TS buffer 201, setting of the reading position of the TS buffer 201 are first performed. Do. Next, in the recording start preparation process (step 303), reception of the digital broadcast is started and displayed on the display unit 110, and preparations for starting the recording are made so as to be able to cope with any start of recording.

  Next, at step 304, it is determined whether to start recording. If the recording is not started due to the user instruction or the recording start time at the time of the reserved recording is not reached, the above-described recording start preparation process (step 303) is continued. When the recording is started due to the user instruction or the recording start time at the time of the reserved recording, the recording start process (step 305) described later performs a process for starting the recording.

  In step 306, it is determined whether an error has occurred in the recording start process (step 305). If it is determined that no error has occurred in the recording start process (step 305), the process proceeds to a recording process (step 307) described later. Next, in step 308, it is determined whether or not an error has occurred in the recording process (step 307). If it is determined in the recording process (step 307) that no error has occurred, it is determined in step 309 whether there is a recording end instruction.

  In step 309, if the recording is not ended by not reaching the user instruction or the recording end time at the time of scheduled recording, the process returns to the recording process (step 307) and the process is continued. When the recording ends due to the user instruction or the recording end time at the time of scheduled recording, the process proceeds to a recording end process (step 310) described later.

  Next, in step 311, it is determined whether an error has occurred in the recording end process (step 310). If it is determined that no error has occurred in the recording end process (step 310), the recording process ends (step 312).

  If it is determined in any of steps 306, 308, and 311 that an error has occurred, error processing corresponding to each process is performed (step 313), and the recording process is terminated (step 312).

  FIG. 4 shows the procedure of the recording start preparation process (step 303) in FIG.

  When the recording start preparation process is started (step 401), a TS packet that is a digital broadcast is acquired (step 402) and stored in the TS buffer 201 (step 403). When the TS packet is saved, the writing position in the TS buffer 201 is updated (step 404), and it is prepared for the acquisition of the next TS packet.

  Next, in step 405, it is determined whether or not the acquired TS packet data is an IDR image. If the acquired TS packet data is not an IDR image in step 405, the recording start preparation process is terminated (step 406). In step 405, if the acquired TS packet data is an IDR image, IDR information including position information of the IDR image is stored in the IDR information storage unit 205 (step 407), and the recording start preparation process is ended (step 407). Step 406).

  FIG. 5 shows the procedure of the recording start process (step 305) in FIG.

  When the recording start process is started (step 501), the IDR image information necessary for displaying the image currently displayed on the display unit 110 is selected from the IDR information stored in the IDR information storage unit 205. A search is performed retrospectively (step 502). In step 503, it is determined whether or not the corresponding IDR information exists in the IDR information stored in the IDR information storage unit 205.

  If it is determined in step 503 that the corresponding IDR information exists, the position information of the IDR image is extracted from the IDR information, and the reading position of the TS buffer 201 is set (step 504). As a result, the head of the recording file becomes an IDR image, and the recording file can be reproduced from the IDR image. Thereafter, the recording file and the time search management file are opened (step 505), and the recording start process is terminated (step 506).

  If it is determined in step 503 that the corresponding IDR information does not exist, a recording start error is set in the recording start error process (step 507), and the recording start process is ended (step 506).

  FIG. 6 shows the procedure of the recording process (step 307) in FIG.

  When the in-recording process is started (step 601), it is determined whether there is a recording end instruction (step 602). If there is a recording end instruction in step 602, the in-recording process is ended (step 603). If there is no instruction to end the recording in step 602, a TS packet that is a digital broadcast is received (step 604) and recorded in the TS buffer (step 605). Then, in preparation for the reception of the next TS packet, the TS packet writing position in the TS buffer is updated (step 606).

  The data content of the TS packet received in step 604 is analyzed to determine whether it is an IDR image (step 607). In step 607, when the data content of the received TS packet is not an IDR image, the process proceeds to step 609 (step 608). In step 607, if the acquired TS packet data is an IDR image, IDR information including position information of the IDR image is stored in the IDR information storage unit 205 (step 608), and the process proceeds to step 609.

  In step 609, before recording in the recording file, it is determined whether the number of TS packets to be recorded has reached the designated number of packets. This is because the file system records in cluster units (32768 bytes (or 16384 bytes)) for the convenience of file system management, whereas one TS packet is 188 bytes (actually, 4 bytes at the beginning of the TS packet) And is handled with 192 bytes), and is not an integer multiple. Therefore, it waits to reach 98304 bytes (3 clusters (32768 bytes × 3), 512 packets (192 bytes × 512)), which is the least common multiple of them, and matches the file system to be recorded with the received TS packet. The sex is secured. At the end of recording, all TS packets to be recorded are recorded without waiting for reaching the least common multiple of 98304 bytes.

  In the present embodiment, 512 packets (98304 bytes) are set to the designated number of packets. However, when a plurality of TS packets are bundled and encrypted or decrypted, the number of bytes of the plurality of TS packets and the file system It can also be set to the number of packets by the number of bytes of the least common multiple with the cluster unit.

  If the number of packets specified in step 609 has not been reached, the process returns to step 602. If the number of packets specified in step 609 has been reached, the process proceeds to step 610.

  In step 610, the designated number of TS packets reached are recorded in the recording file, and the reading position of the TS buffer is updated in preparation for writing to the next recording file (step 611). Thereafter, the process proceeds to step 612.

  In step 612, whether or not the provisional termination of the recording file being recorded is updated for the recorded TS packet recorded in step 610 in the recording file being recorded, and whether or not the provisional termination update notification of the recording file to the playback system is permitted. Is determined (step 613).

  The recording file temporary end update notification is permitted to the reproduction system under the control of the control unit 101. In the case of chasing playback to be played back from the file being recorded, the notification of the provisional termination update of the recording file is allowed to the playback system, and when recording while watching the digital broadcast being received, the provisional termination update notification of the recording file to the playback system The operation is not permitted.

  If it is determined in step 613 that the recording file temporary termination update notification to the playback system is not permitted, the process returns to step 602 to continue the recording process. If it is determined in step 613 that the recording file temporary end update notification is permitted to the playback system, the recording file temporary end update notification is sent to the playback system (step 614), and the process returns to step 602 (the processing during recording continues). To do).

  The reason for sending the recording file temporary end update notification to the playback system is that the end of the recording file being recorded is updated sequentially during recording, and as a playback system it is clear how far the recorded file can be played back. It is.

  FIG. 7 shows the procedure of the recording end process (step 310) in FIG.

  When the recording end process is started (step 701), the TS packet (recording data) to be recorded is recorded in the recording file being recorded (step 702).

  Next, the end of the recorded recording file is updated (step 703), and the IDR information stored in the IDR information storage unit 205 is recorded as a time search point in the time search management file (step 704).

  Thereafter, the recording file is closed (step 705) and the time search management file is closed (step 706), and the recording end process is ended (step 707).

  FIG. 8 shows an example of specific data of the time search management file.

  The time search management file in FIG. 8 is a file generated from the IDR information stored in the IDR information storage unit 205.

  The top indicates the number of registered time search points (4 bytes) in the time search management file. In the example of FIG. 8, since there are six time search points, the value of the registered number is “6”. Is set.

  The next four parameters are information relating to time search point number 0, and each information is composed of 4 bytes. The contents of the information are (1) the packet number from the beginning of the file (start packet number) indicating the read position in the file, (2) the number of packets necessary for displaying the image (the number of required packets), and (3) the display. A time stamp value indicating a time (PTS (Presentation Time Stamp) value), and (4) a display relative time (relative time from the beginning of the file) until this point is displayed from the beginning reproduction time of the recording file.

  The PTS value indicating the display time is a value necessary to perform synchronized reproduction of video and audio, and is synchronized with a PCR (Program Clock Reference) indicating program time reference value information multiplexed in the digital broadcast. It is the value. The PTS value is 33 bits and the accuracy is 90 kHz. In the first embodiment, since the PTS value is stored in a storage area of 4 bytes (32 bits), it is 32 bits and the accuracy is 45 kHz.

  The PTS is described in detail in MPEG-2 Systems (ISO / IEC13818-1).

  The data of time search point number 0 starts from packet number 0 (start of file), the required number of packets is 176 packets, the PTS value is 1803184, and the relative time from the start of the file is the first time search point (start) in the file Therefore, it is 0 (seconds).

  The data of time search point number 1 starts from packet number 9660 (file head), the required number of packets is 172 packets, the PTS value is 3605424, and the relative time from the file head is 20 (seconds).

  Thereafter, every time search point increases by one, four parameters (16 bytes) are added. When the number of time search points is 6, the total number of parameters is 24, and the total number of bytes of the time search management file is 100 bytes including the number of registrations.

  In the time search management file of FIG. 8, there is a time search point every 20 seconds, but in practice, all IDR image positions are registered as time search points (however, If the time interval between the IDR image and the next IDR image is short, it may be omitted.)

  Next, the chasing playback operation will be described in detail based on FIG. 9, FIG. 10, and FIG. FIG. 9 is a flowchart relating to determination of the chase playback start position to be played back from a file being recorded, FIG. 10 is a flowchart during chase playback, and FIG. 11 is a flowchart of seek position search processing. Note that the same reference numeral “A” in FIGS. 9 and 10 indicates that the processing is continuous.

  When the chasing playback start process is started (step 901), first, the position at which chasing playback is started (seek position (relative time from the beginning of the recording file)) is set to the beginning of the recording file being recorded (step 902). A seek position search process (step 903) to be described later is performed. It is determined whether or not there is an error in the seek position search process (step 903) (step 904), and if there is no error in the seek position search process (step 903), the process proceeds to step 905.

  In step 905, it is determined whether or not there is a notification of update of the recording file temporary end during recording. If there is a recording file provisional end update notification during recording in step 905, the recording file provisional end is updated (step 906), and the process proceeds to step 907. If it is determined in step 905 that there is no update notification of the recording file temporary end during recording, the process proceeds to step 907.

  In step 907, it is determined whether there is a seek instruction for moving the chasing playback start position. If there is a seek instruction in step 907, a seek position search process (step 908) described later is performed, and it is determined whether or not there is an error in the seek position search process (step 908) (step 909). If there is no error in the seek position search process (step 908), the process moves to the read position (chasing playback start position) set in the seek position search process (step 908), and the process proceeds to step 910. If it is determined in step 907 that there is no seek instruction, the process proceeds to step 910.

  In step 910, it is determined whether or not start of chasing playback has been instructed. If it is determined in step 910 that start of chasing playback is not instructed, it is determined whether or not there is an instruction to end chasing playback (step 911). If there is an instruction to end chasing playback, the determination is made by step 910. The chasing playback start position determination process is terminated based on the chasing playback start position thus made (step 912).

  In the seek position search process (step 903 or step 908), if there is an error as a result of determining whether there is an error (step 904 or step 906), seek error process (step 913) is performed. The chasing reproduction start process is terminated (step 912).

  If there is an instruction to start chasing playback in step 910, chasing playback is started (transition to terminal 1001 in FIG. 10 via terminal 914).

  In FIG. 9, the seek position is the relative time from the beginning of the recording file, but it can also be performed by moving between time search points. This method is a general method for realizing fast forward (FF), fast reverse (FR), etc. by operation of the operation unit 102.

  When the chasing playback is started (terminal 1001), the packet data is read from the chasing playback position (reading position), and the read packet data is transferred to the DEMUX unit 202 (step 1002).

  In step 1002, in the case of reading immediately after the seek, the packet data determined by the IDR information of the IDR information storage unit 205 is read as many packets as necessary (176 packets at time search point number 0) and read to the DEMUX unit 202. Is transferred (step 1002). Thereafter, the read position is updated for packet data transfer (step 1003), and the updated read position is determined.

  The reading position here is managed by the packet number from the beginning of the file. Further, the provisional final packet number of the recording file being recorded is determined based on the number of packets already recorded in the recording file being recorded.

  If the updated read position does not exist in the TS buffer 201 in step 1004, the read position is set in the recording file being recorded (step 1005), and the process proceeds to step 1007. In this case, the MPX unit 206 selects the recorded file recording unit 113 under the control of the control unit 101.

  If the updated read position exists in the TS buffer 201 in step 1004, the read position is set in the TS buffer 201 (step 1006), and the process proceeds to step 1007. In this case, the MPX unit 206 selects the TS buffer 102 under the control of the control unit 101.

  If the read position managed by the packet number from the beginning of the file exists in both the recording file being recorded and the TS buffer 201, the reason for setting the read position in the TS buffer 201 is that the recording file recording unit 113 This is because the access time is shorter when the TS buffer 201 is accessed than when the recorded file is accessed.

  In step 1007, it is determined whether or not there is a notification of updating the recording file temporary end during recording. If there is a recording file provisional end update notification during recording in step 1007, the recording file provisional end is updated (step 1008), and the process proceeds to step 1009. If it is determined in step 1007 that there is no recording file temporary end update notification during recording, the process proceeds to step 1009.

  In step 1009, it is determined whether there is a seek instruction for moving the chasing playback start position. If there is a seek instruction in step 1009, a seek position search process (step 1010) described later is performed, and it is determined whether or not there is an error in the seek position search process (step 1010) (step 1011). If there is no error in the seek position search process (step 1010) in step 1011, the chasing playback start position moves to the designated seek position, and the process proceeds to step 1012. If there is no seek instruction in step 1009, the process proceeds to step 1012.

  In step 1012, it is determined whether there is an instruction to end chasing playback. If there is an instruction to end chasing playback in step 1012, the process during chasing playback ends (step 1013).

  In the seek position search process (step 1010), as a result of determining whether there is an error (step 1011), if there is an error in the seek position search process (step 1010), the seek error process (1014) is performed. Then, the chasing playback start process is terminated (step 1013).

  FIG. 11 shows the flow of the seek position search process.

  When the seek position search process is started (step 1101), first, the IDR information storage unit 205 is searched from the designated seek position (step 1102), and it is determined whether or not the corresponding seek position exists (step 1103). .

  The time search management file in FIG. 8 is substantially equivalent to the IDR information in the IDR information storage unit 205, and therefore will be described using the time search management file in FIG. When the specified seek position (relative time from the beginning of the recording file) completely matches the relative display time of the time search point from the beginning of the file, that time search point becomes the corresponding seek position and The read position is determined by the packet number. If the specified seek position (relative time from the beginning of the recording file) does not match the relative display time from the beginning of the time search point, the relative display time from the beginning of the time search point is specified. The time search point having a value smaller than the seek position (relative time from the beginning of the recording file) is set as the corresponding seek position, and the reading position is determined based on the packet number from the beginning of the file.

  When there is an update of the recording file temporary end during recording, if the value obtained by adding the required number of packets to the packet number from the top of the file exceeds the updated temporary final packet number in the recording file being recorded, The time search point is determined not to exist in the recording file being recorded.

  In step 1103, if the corresponding seek position exists, it is determined whether or not the corresponding seek position exists in the TS buffer 201 (step 1105).

  If the corresponding seek position is not in the TS buffer 201 in step 1105, the read position is set in the recording file being recorded (step 1106), and the seek position search process is terminated (step 1108). In this case, the MPX unit 206 selects the recorded file recording unit 113 under the control of the control unit 101.

  If the corresponding seek position exists in the TS buffer 201 in step 1105, the read position is set in the TS buffer 201 (step 1107), and the seek position search process is terminated (step 1108). In this case, the MPX unit 206 selects the TS buffer 201 under the control of the control unit 101.

  If the corresponding seek position does not exist in step 1103, it means that there is no time search point. Therefore, a seek error is set (1104), and the seek position search process is terminated (step 1104). 1108).

  The chasing playback instruction is given by the user (viewer), but the following cases are assumed.

  (1) A telephone call is received during broadcast reception, and the broadcast during the call time is recorded and chasing playback is performed.

  (2) A mail is received during broadcast reception, and the broadcast during the mail viewing time is recorded and chased and reproduced.

  (3) Watch only the sound, record the broadcast during the time when only the sound was watched, and perform chasing playback.

  (4) Only the data broadcast of the digital broadcast is displayed, the broadcast during the time when only the data broadcast was viewed is recorded, and the chase playback is performed.

  (5) During the reserved recording, the recorded program is reproduced and viewed without waiting for the end of the recording.

  (6) During the broadcast reception, the highlight scene in the received program is reproduced and viewed. At this time, it is convenient to quickly search for a target reproduction start position using fast forward (FF), fast reverse (FR), or the like.

  Of course, the user (viewer) can switch to playback of the digital broadcast currently being received at any time.

  In the embodiment shown in FIG. 9, FIG. 10, and FIG. 11, it is determined whether or not the corresponding seek position exists in the TS buffer 201, and the TS buffer 201 is reproduced from the playback from the recording file being recorded. It is possible to switch to the playback from the packet data within, and in the case of the time-short playback exceeding 1 × speed, it is possible to switch to the playback of the currently received digital broadcast when catching up with the currently received digital broadcast.

  At this time, the user (viewer) can be notified of the catch-up of the digital broadcast being received by display or voice.

  It is one of the choices to notify at the time of catching up or to notify during catch-up playback.

  For example, “display by numerical value of remaining seconds” can be adopted to display the remaining catch-up time to be notified during catch-up reproduction. Note that the value is constant during 1 × speed time-shift playback.

  Further, “display by scroll bar” can be adopted for displaying the remaining catch-up time to be notified during catch-up reproduction. In this case, the currently displayed position from the recording start time to the latest reception position is shown. During time-shift playback at 1 × speed, since the total time from the recording start time to the latest reception position is increased, the proportional distribution is different, but the section to the latest reception position is constant.

  When switching the packet data to be reproduced from the packet data of the recording file being recorded to the packet data in the TS buffer 201, the time search point after transferring the required number of packets at the time search point in the recording file being recorded. If the palette number in the TS packet 201 is determined from the packet number obtained by adding the packet number from the beginning of the file to the required number of packets, the packet data is smoothly continued without missing the packet data.

  In the embodiment shown in FIG. 9, FIG. 10, and FIG. 11, it is determined whether or not the seek position exists in the TS buffer 201. In each case, the temporary end packet number of the recording file being recorded can be calculated, and only the time search points recorded in the recording file being recorded can be set as seek targets.

<Embodiment 2>
In the first embodiment, IDR (Instantaneous Decoder Refresh) image detection is performed at the time of recording. However, the technique is based only on analysis of a PES (Packetized Elementary Stream) header, and IDR. It is determined that the image is an image and stored in the IDR information storage unit 205. Since it is not guaranteed that the IDR image stored in the IDR information storage unit 205 can be normally decoded, when seeking and displaying the corresponding IDR image, an image that cannot be normally decoded may be displayed.

  Therefore, in the second embodiment, in order to ensure that the IDR image stored in the IDR information storage unit 205 can be normally decoded, it is confirmed that the IDR image can be decoded and decoded normally during recording. Saved in the IDR information storage unit 205.

  FIG. 12 is a block diagram illustrating a data flow when the digital broadcast receiving function-equipped mobile terminal 100 according to the second embodiment receives a digital broadcast and tracks and reproduces the received digital broadcast.

  The recording system block 1201 and the playback system block 1202 are separately managed.

  Note that the reproduction system block 1202 has already been described with reference to the block diagram of FIG. 2, and therefore detailed description thereof is omitted here.

  In the recording system block 1201, a recording DEMUX unit 1203, a recording ES buffer 1204, and a recording video decoding unit 1205 are added exclusively for the recording system.

  The digital broadcast is received via the broadcast receiving antenna 104 and is tuned by the tuning unit (tuner) 103. The selected digital broadcast is temporarily stored in the TS buffer 201 in the storage unit 107 in the TS (Transfer Stream) format.

  The TS data temporarily stored in the TS buffer 201 is subjected to PES (Packetized Elementary Stream: packetization) of video data by a recording DEMUX (Demultiplexing) unit 1203 which is a recording demultiplexing unit that separates the TS data in the control unit 101. Only stream) is extracted and stored in the recording video ES buffer 1204 in the storage unit 107. When the video data stored in the video ES buffer 1204 is an IDR image, the recording video decoding unit 1205 performs a decoding process.

  Of course, the decoded IDR image is not displayed, and after the IDR image decoding process is completed and it is determined whether the IDR image is normally decoded, it is prepared for the next IDR image decoding process. The recording video ES buffer 1204 is cleared.

  In this embodiment, whether or not an IDR image is determined is stored in the recording video ES buffer 1204 and then decoded before being decoded by the recording video decoding unit 1205, but is stored in the recording video ES buffer 1204. It can also be determined before the recording or before the recording DEMUX unit 1203 is processed.

  FIG. 13 shows a flowchart for explaining the processing algorithm of the recording block 1201 in the second embodiment.

  When the in-recording process is started (step 1301), it is determined whether there is a recording end instruction (step 1302). If there is a recording end instruction, the in-recording process is ended (step 1303).

  If there is no instruction to end recording in step 1302, a TS packet that is a digital broadcast is received (step 1304) and temporarily stored in the TS buffer (step 1305). Then, in preparation for reception of the next TS packet, the TS packet writing position in the TS buffer is updated (step 1306).

  Thereafter, the data content of the TS packet received in step 1304 is analyzed to determine whether it is an IDR image (step 1307). If the data content of the received TS packet is not an IDR image in step 1307, the process returns to step 1302. If the TS packet data acquired in step 1307 is an IDR image, the recording video decoding unit 1205 performs decoding processing (step 1308), and whether there is a decoding error in the decoding processing in step 1308. It is determined whether or not (step 1309).

  In step 1309, if there is a decoding error in the decoding process in step 1308, it is determined that the IDR image could not be normally decoded, and the process returns to step 1302 without saving in the IDR information saving unit 205. In step 1309, if there is no decoding error in the decoding process in step 1308, it is determined that the IDR image has been successfully decoded, and IDR information such as the IDR image position is stored in the IDR information storage unit 205 ( Step 1310) and return to Step 1302.

  As a result, only IDR information that can be normally decrypted is stored in the IDR information storage unit 205.

  As described above, according to the recording / playback apparatus according to the present embodiment, the user can arbitrarily set the chasing playback position in chasing playback in which a past digital broadcast is viewed from the received digital broadcast. It becomes possible.

  In the present embodiment, the portable terminal 100 has been described as an example of a recording / playback apparatus. However, it is obvious that the present invention can be applied to a stationary fixed receiving apparatus. In addition, digital broadcasting includes terrestrial digital broadcasting and digital broadcasting via an artificial satellite, but the same applies to wireless digital broadcasting, and the present invention can be similarly applied.

<Embodiment 3>
The third embodiment of the present invention is considered to provide an IC (semiconductor integrated circuit) as an independent control circuit with the function of performing the processing of the recording / playback control circuit described in the first and second embodiments. It is done.

  For example, among the functions of the control unit 101 in FIG. 1 of the first embodiment, the function of performing a series of recording and playback processes can be an independent recording and playback control circuit. Further, the recording / playback control circuit can be further expanded to incorporate another configuration of the recording / playback apparatus.

  FIG. 14 shows a configuration example of a recording / playback control circuit according to the third embodiment of the present invention. As shown in FIG. 14, the recording / playback control circuit 1401 is implemented as a part of the control unit 101 in the configuration of the portable terminal 100 with a digital broadcast receiving function in FIG. The audio decoding unit 111, the internal timer 113, and the storage unit 1402 are included. The recording / playback control circuit 1401 is provided as an IC.

  As shown in FIG. 14, the internal timer 113 may have a configuration for taking in from outside the recording / reproduction control circuit 1401 in addition to the configuration included in the recording / reproduction control circuit 1401. The storage unit 1402 can be configured to use the storage unit 107 used by the control unit 101.

  FIG. 15 shows a main part configuration of portable terminal 100 according to the third embodiment. Here, the flow of data at the time of digital broadcast reception and chasing playback is shown. Although the data flow is the same as that shown in FIG. 2 of the first embodiment, a portion executed by the recording / playback control circuit 1501 (corresponding to the recording / playback control circuit 1401 in FIG. 14) is newly illustrated. Yes.

  FIG. 16 shows another configuration example of the recording / playback control circuit according to the third embodiment. Here, the flow of data at the time of digital broadcast reception and chasing playback is shown. The flow of data is the same as that shown in FIG. 12 of the second embodiment, but the part executed by the recording / playback control circuit 1601 is newly illustrated.

  As described above, by providing a recording / playback control circuit (1401, 1501, 1601) with a function for performing a series of playback processing, digital broadcasting can be performed on mobile terminals such as mobile phones, PDAs and in-vehicle terminals, and DVD recorders. By mounting the recording / playback control circuit (1401, 1501, 1601) for various devices that can receive the video, the recording / playback apparatus described in the first embodiment can be easily realized.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  In the above description, the case where the invention made by the present inventor is mainly applied to a portable terminal with a digital broadcast receiving function, which is a field of use as a background, has been described. However, the present invention is not limited thereto, and recording is performed. It can be widely applied to playback devices.

  The present invention can be applied on condition that recording and reproduction of at least received digital broadcast is possible.

It is a schematic block diagram which shows an example of an internal structure of the portable terminal with a digital broadcast receiving function concerning Embodiment 1 of this invention. FIG. 3 is a block diagram illustrating a configuration example of a main part in the mobile terminal with a digital broadcast receiving function according to the first exemplary embodiment of the present invention. It is the flowchart which showed the procedure of the video recording process in Embodiment 1 of this invention. It is the flowchart which showed the procedure of the recording start preparation process in Embodiment 1 of this invention. It is the flowchart which showed the procedure of the video recording start process in Embodiment 1 of this invention. It is the flowchart which showed the procedure of the process during recording in Embodiment 1 of this invention. It is the flowchart which showed the procedure of the video recording end process in Embodiment 1 of this invention. It is explanatory drawing of the example of the specific data of the time search management file in Embodiment 1 of this invention. 6 is a flowchart relating to chase playback start position determination for playback from a file being recorded in Embodiment 1 of the present invention. 6 is a flowchart during chasing playback in the first embodiment of the present invention. It is a flowchart of the seek position search process in Embodiment 1 of this invention. It is an example block diagram of a principal part in the portable terminal with a digital broadcast receiving function concerning Embodiment 2 of this invention. It is a flowchart for demonstrating the processing algorithm of the video recording system block in Embodiment 2 of this invention. It is a block diagram of a configuration example of a mobile terminal with a digital broadcast receiving function according to a third embodiment of the present invention. It is an example block diagram of the principal part in the portable terminal with a digital broadcast receiving function concerning Embodiment 3 of this invention. It is an example block diagram of the principal part in the portable terminal with a digital broadcast receiving function concerning Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Mobile terminal with digital broadcast reception function 101 Control unit 102 Operation unit 103 Channel selection unit 104 Broadcast reception antenna 105 Wireless communication unit 106 Communication transceiver antenna 107 Storage unit 108 Recording file recording unit 109 Video decoding unit 110 Display unit 111 Audio decoding unit 112 Audio output unit 113 Internal timer 201 TS buffer 202 DEMUX unit 203 Video ES buffer 204 Audio ES buffer 205 IDR information storage unit 206 MPX unit 1203 Recording DEMUX unit 1204 Recording video ES buffer 1205 Recording video decoding unit 1401 Recording / playback control Circuit 1402 Storage unit 1501 Recording / playback control circuit 1601 Recording / playback control circuit

Claims (11)

A recording / playback apparatus that enables recording and playback of a received digital broadcast,
Corresponding to a recording file for recording the digital broadcast, a recording unit capable of storing a time search management file that enables management of time search information;
An operation unit that enables setting of the start position of chasing playback at an arbitrary position of the time search information;
And a control unit that controls chasing playback from the chasing playback start position set at an arbitrary position of the time search information.   The recording / playback apparatus according to claim 1, wherein when a recording file is formed from the digital broadcast, data is additionally recorded in the recording file for each designated number of packets. A TS buffer for temporarily storing the received digital broadcast;
A first function for determining whether or not data corresponding to the chasing playback start position exists in the TS buffer;
The recording / playback apparatus according to claim 1, wherein when the data corresponding to the chasing playback start position exists in the TS buffer, the reading position is set in the TS buffer.   The recording / playback according to claim 1, further comprising a second function of determining whether or not the decoding unit for decoding the received digital broadcast has been normally decoded, wherein the position where the decoding has been normally performed is stored as the time search information. apparatus. A TS buffer for temporarily storing the received digital broadcast;
The control unit includes a recording start processing function for starting the digital broadcast recording;
A recording processing function for the above digital broadcast recording processing;
A recording end processing function for ending the recording of the digital broadcast;
The recording / playback apparatus according to claim 1, further comprising a chasing playback processing function for chasing playback from a chasing playback start position set at an arbitrary position of the time search information. The process by the recording start processing function includes a first process for searching for IDR information for constituting a display image,
A second process for extracting position information of an IDR image from the IDR information when the IDR information is present, and setting the reading position;
6. The recording / reproducing apparatus according to claim 5, further comprising a third process for opening the recording file and the time search management file after the second process. The processing by the processing function during recording includes a fourth process of receiving a TS packet that is a digital broadcast and recording it in the TS buffer;
In preparation for receiving the next TS packet, a fifth process for updating the TS packet writing position in the TS buffer;
Analyzing the data content of the TS packet and determining whether it is an IDR image;
When the acquired TS packet data is an IDR image, a seventh process for storing IDR information;
An eighth process for determining whether the number of TS packets to be recorded has reached the specified number of packets before recording in the recording file;
A ninth process for recording the TS packet in a recording file when the number of TS packets to be recorded reaches the designated number of packets;
A tenth process for updating the reading position of the TS buffer in preparation for writing to the next recording file;
An eleventh process for updating a provisional end of the recording file being recorded for a recorded TS packet in a recording file being recorded, and determining whether or not notification of the provisional end update of the recording file to the playback system is permitted; 6. The recording / reproducing apparatus according to claim 5, further comprising: The processing by the recording end processing function includes a twelfth processing for recording a TS packet to be recorded in a recording file being recorded,
A thirteenth process of updating the end of the recording file that has been recorded and recording the stored IDR information as a time search point in the time search management file;
6. The recording / reproducing apparatus according to claim 5, further comprising: a fourteenth process for closing the recording file and closing the time search management file. The chasing playback processing function includes a fifteenth process for setting a position at which chasing playback is started to the beginning of a recording file being recorded and searching for a seek position;
6. A recording / reproducing apparatus according to claim 5, further comprising: a sixteenth process for determining whether or not start of chasing playback has been instructed and starting chasing playback when instructed to start chasing playback.   In the fifteenth process, it is determined whether or not the designated seek position exists in the TS buffer. If the corresponding seek position is not in the TS buffer, the read position is set in the recording file being recorded. The recording / playback apparatus according to claim 9, further comprising: a seventeenth process for setting a read position in the TS buffer when the seek position is set and the seek position exists in the TS buffer.   The recording / playback apparatus according to claim 5, wherein the control unit is formed by a microcomputer that executes a predetermined program, and each processing function in the control unit is realized by executing the program.

Images