JP4712610B2 - Data broadcasting receiver - Google Patents

Description

  The present invention relates to a receiver having a data broadcast recording / reproducing function, a data broadcast recording method, and a data broadcast reproducing method.

  FIG. 12 is a diagram showing an outline of a transport stream (TS) for digital broadcasting.

  As shown in the figure, in digital broadcasting, video V, audio A, and data content D are all divided into packet units and transmitted in a multiplexed stream format conforming to MPEG2 defined by the ISO / IEC13818-1 standard.

  In the case of content linked to a program such as subtitles or text superimposing, the data content D that is data-broadcasted in the transport stream (TS) is compressed into the encoded bitstream ES in the same manner as the video V and audio A. Packetized in PES (Packetized Elementary Stream) format to which display time information is added after conversion to DMC-CC (Digital Storage Media-Command and Control) for storage service content such as weather forecasts and news ) Packetized in section.

  Data content D packetized in the DMC-CC section is data broadcast by a data carousel transmission system. The data carousel transmission method is a method in which the data content D is repeatedly transmitted so that the receiving side can acquire the necessary data content D even during the broadcast.

FIG. 13 is a diagram illustrating an example of a data carousel structure.
As shown in the figure, a data broadcasting transmitting station transmits data content D through a DII (Download Information Indication) section representing attributes of each data module (still image data, graphic data, and character data) and each data module. The data is converted into a DDB (Download Data Bloack) section divided in units of size, and these series of modules are repeatedly transmitted at predetermined intervals. A series of these modules corresponding to the data content D is called a carousel.

  Digital broadcasts, including data broadcasts for data carousel transmission, can be received and played back by TV devices that support digital broadcasts, as well as services for mobile terminals for digital terrestrial broadcasts starting on April 1, 2006 (hereinafter referred to as 1Seg). (Broadcast) will be available for viewing on mobile phone terminals. Briefly explaining the one-segment broadcasting, a 6 Mhz band (corresponding to one channel of conventional analog broadcasting) broadcast from a broadcasting station is divided into 13 subbands and operated. Here, each subband is called a segment. One segment out of 13 segments is reserved for mobile broadcasting, and one segment broadcasting (one-segment broadcasting) provides simple video broadcasting for mobile phones and PDAs using this one segment. is there.

  Devices having a function of recording and reproducing digital broadcasts including data carousel transmission data broadcasts have also been developed. Such a recording / reproducing apparatus is described in Patent Document 1, for example. In the technique of Patent Document 1, when data content of data broadcasting and a video / audio stream are separated and recorded, only one of the data content repeatedly transmitted is recorded on a medium, and the data transmitted next is recorded. When the content is the same as that recorded on the medium, only the transmission end time of the data content is recorded on the medium as a time stamp, thereby avoiding repeated recording of data content that is repeatedly transmitted.

Further, Patent Document 2 describes a method for reproducing recorded data broadcast at high speed at n times speed. In the technique described in Patent Document 2, at the time of reproduction, by rewriting a numerical value of a constant indicating the count time or the like (beitem, time_value) described in the data broadcasting program to 1 / n, n Realizes double-speed data broadcast playback.
JP 2002-152688 A JP 2003-143522 A

  When playing back video information using a video deck or the like, special playback modes such as fast-forwarding and cueing can be used freely in addition to normal playback. However, in playback of recorded data broadcasts, for example, cueing playback ( Playback cannot be started at any point in time.

  Data broadcast data (comprised of image data, sound data, a program for displaying and outputting these data, etc.) in a digital television broadcast program is processed by the program according to a predetermined process (control signal included in data broadcast data, viewing Display signal is output at the timing of receiving an input signal from a person or a detection signal for detecting that a certain time has passed. Data broadcasting is different from video data playback in the first place, because a program (script) is displayed and output by executing a certain process, so data broadcasting data of a digital TV broadcast program recorded in advance is played back at high speed. In order to do this, the program (script) needs to operate in the same way as when on air, which is a major factor that hinders the realization of special playback.

  That is, in data broadcasting, since the display content is not unique and changes dynamically, even if a certain point in time is specified, there are a plurality of candidates for the display content at that point, and the content is undefined. Since the display content changes depending on the script, eventually, the recorded data broadcast content must be reproduced from the beginning, and the script is operated in the same procedure as in the on-air state to reproduce while determining the display screen.

  If cue playback from any point in time is not possible, the content at the desired time cannot be played back and viewed immediately, so the viewer has to wait until the image at the desired time appears, which is inconvenient Occurs.

  The present invention has been made based on such considerations, and an object thereof is to enable cueing reproduction of data broadcast contents.

The data broadcast receiver of the present invention receives data broadcast content transmitted from a broadcast station, acquires a module including a BML (Broadcast Markup Language) document, interprets the BML document by a BML browser, and converts the BML document into the BML document. The display contents are displayed and the display contents are changed in response to the event, and the BML document and data including information on monomedia data referred to by the BML document are recorded on the recording medium. A receiver having a data broadcast recording / playback function having a function of reading and playing back recorded data, the information of the event received by the BML browser, and time information indicating the time when the event occurred; , And the BML browser interprets one BML document. When the event occurs, the one BML document is divided before and after the event occurs, and the divided BML document after the event occurs is triggered by the event. Information including the code value indicating the state immediately after the display is switched as a result of the script processing, thereby creating a data content for recording, and information on the event recorded by the event recording unit The recording processing unit that records data including the time information and the recording content created by the recording content creation unit on the recording medium, and the recording processing when receiving a playback processing command specifying the playback time point A BML document corresponding to a designated playback time with reference to the event information and the time information recorded on the medium Performing the cue reproduction processing to start playback from the beginning; and a reproduction processing unit capable.

  When an event (broadcast event, user event and timer event) occurs during data broadcast reception, script processing according to the BML document is performed, a script execution function (user-defined function) is called, the script is executed, and the screen is switched. . At this time, one BML document is divided before and after the time when the event occurs, the time is recorded, and the state of the BML document immediately after the screen is switched (the contents of the script processing generated by the event are reflected). The state including the coded code value) is recorded. As a result, when performing playback processing later, it is possible to skip the BML document before the event occurrence and jump to the execution of the BML document immediately after the event occurrence, so that the content corresponding to the designated playback time point can be jumped to Cueing from the beginning is possible.

  When there is a reproduction instruction specifying a reproduction time point, the reproduction processing unit performs a search using, for example, event information and time information as index information, and at a specified time point among a plurality of divided BML documents. A corresponding BML document is detected, and cueing is started from the beginning of the BML document. When the reproduction processing unit has such a function, it is possible to perform cueing reproduction of data broadcasting, and user convenience is improved.

  According to the present invention, data broadcasting content can be cued and reproduced, the performance of a data broadcasting receiver (such as a TV or mobile terminal capable of viewing data broadcasting) is improved, and user convenience is improved.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a configuration of a receiver having a data broadcast recording / reproducing function of the present invention.

  Broadcast data including data broadcast content transmitted from a broadcast station is received by the tuner 10 via an antenna (AN).

  Here, the data broadcast contents are mainly BML documents, monomedia data such as moving images and still images, style sheets, external scripts, and binary tables that are referred to by the BML documents.

  The tuner 10 extracts a signal having a specific frequency from the received high frequency digital modulation signal. Further, the tuner 10 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like (all not shown), thereby demodulating the selected digital modulation signal and outputting a transport stream (TS).

  The PID (packet ID) filter 11 converts a transport stream (TS) received from the tuner 10 into, for example, an AV stream such as an MPEG2 (Moving Picture Experts Group 2) video stream or an audio stream, and a data broadcasting stream ( Section data). The section data is further separated into PSI / SI (Program Specific Information / Service Information) and a data carousel by a section filter (not shown).

  The AV decoder 12 decodes the audio system encoded signal output from the PID filter 11, further D / A converts it to generate an audio signal, supplies this audio signal to a speaker (not shown), The encoded signal of the system is decoded to obtain a quantization coefficient and a motion vector, and video data is output by performing inverse DCT transformation, motion compensation control based on the motion vector, and the like. Also, the size and resolution of the image of the video data are adjusted.

  The data broadcast decoder 13 extracts module data constituting the data broadcast content from the transport stream (TS) and receives a broadcast event message (hereinafter simply referred to as a broadcast event) that is message information from the broadcast station. .

  The display / operation control unit 15 is a part corresponding to a CPU (not shown) and the frame memory 19 in the hardware configuration, and a part corresponding to the monomedia decoder 16, the content manager 17, and the BML browser 18 in the software configuration. It is.

  The mono media decoder 16 performs a decoding process on various mono media data (JPEG, PNG, 8-unit character code, etc.) constituting the content.

  The content manager 17 stores and manages modules received by the data broadcast decoder 13 on a buffer memory (not shown).

  The BML browser 18 interprets and renders BML documents and provides an interface for user operations. That is, the BML browser 18 has a function of accepting a request generated by the user P operating the input device (input key, remote control terminal, etc.) 22 and generating an interrupt.

  The frame memory temporarily holds frame data necessary for drawing one screen, and an image is displayed on the display device 20 based on the frame data.

  The broadcast recording control unit 30 includes an event recording unit 32, a recorded content creation unit 34, and a recording processing unit 36. The event recording unit 32 and the recorded content creation unit 34 are functional blocks responsible for the characteristic functions of the present invention.

  The event recording unit 32 records information on events (broadcast event, user event, timer event) received by the BML browser 18 and time information indicating when the event occurs.

  In addition, when an event occurs while the BML browser 18 interprets one BML document, the recorded content creation unit 34 divides one BML document before and after the event occurs and also divides the BML document. In addition, the BML document after an event is processed to include a code value indicating a state immediately after the display is switched as a result of the script processing that is triggered by the event. Create

  In addition, the recording processing unit 36 multiplexes data including event information and time information recorded by the event recording unit 32 and recording content created by the recording content creation unit 34. The data is further multiplexed with video information by the multiplexer 40 and recorded on the recording medium 42.

  The demultiplexer 44, the video / audio decoder 46, and the data reproduction processing unit 48 constitute a reproduction processing unit. These functional blocks perform operations reverse to those at the time of recording to reproduce AV content and data broadcast content.

  The data playback processing unit 48 has a cue playback function. That is, when there is a reproduction instruction designating a reproduction time point, for example, a search using event information and time information as index information is performed, and a BML corresponding to the designated time point is selected from a plurality of divided BML documents. A document is detected, and cueing is started from the beginning of the BML document. When the data reproduction processing unit 48 has such a function, it is possible to perform the cue reproduction of the data broadcast.

  FIG. 2 is a diagram for explaining the contents of data broadcast content transmitted from a broadcast station.

  The data broadcasting content is transmitted by the DSM-CC data carousel transmission system defined by ARIB STD-B24. Unlike the stream type transmission system such as video / audio, the data broadcasting content is transmitted repeatedly for a certain period of time. Makes it possible to acquire data at an arbitrary timing. A set of data repeatedly transmitted is a data carousel, and each piece of data is a module.

  Also, what corresponds to a channel in conventional analog broadcasting is called a service, and each service includes a plurality of components, and each component includes a plurality of modules.

  Each service is uniquely identified by a service identification (service_id), each component is uniquely identified by a component identification (component_tag) within the service, and each module is uniquely identified by a module identification (module_id) within the component (Ie, the module is uniquely identified by service_id / component_tag / module_id).

  In FIG. 2, program 1 and program 2 are included in the video / audio channel. The components (corresponding to elementary streams in the TS) A and B both include a plurality of local contents.

  Content transmitted in a data carousel may be updated in time, and a meaningful piece of content transmitted in a certain time is called local content. When the local content is switched, all modules transmitted before switching are not required. The data event identification (data_event_id) identifies local content and is updated when the local content is switched. At this time, a data event update is issued.

In the case of component B, the local content 100 includes a carousel 100, and the carousel 100 includes a module 110. The local content 102 includes carousels 200, 210, and 220, and each carousel includes modules 202, 204, and 206, and a module 208. Each module is managed by module_id and module_version, and a module update event is issued when module generation or disappearance or module_version changes.
In addition to the components A and B, the general-purpose event message 150 can be sent at an arbitrary timing for the purpose of changing the display.

  Next, the types of events that trigger display changes will be described. FIG. 3 is a diagram for explaining the types of events that trigger display changes.

  Data broadcast content changes are triggered by events. As shown in FIG. 2, the type of event is a broadcast event (one inserted by a broadcasting station for the purpose of changing the display of data broadcast content at a certain timing in a program, a module update, or a local content update). Notification events), timer events (those that set a timer and change the display of data broadcast content when a predetermined time has elapsed), and user events (those caused by user key operations, etc.) Is done.

  When the user P operates the input device 22 and a user event occurs, the BML browser 18 (see FIG. 1) in the display operation control unit 15 detects the event occurrence. When there is a broadcast event, the data broadcast decoder 13 notifies the BML browser 18 in the display operation control unit 15, thereby detecting the occurrence of the broadcast event.

  Further, as shown in FIG. 1, the event occurrence is notified from the coder 13 to the event recording unit 32 in the broadcast recording control unit 30 by the BML browser 18 and data broadcasting. The event recording unit 32 stores the event occurrence time and the event type in association with each other.

  Next, the function of the recorded content creation unit 34 in FIG. 1 will be described. FIG. 4 is a diagram for explaining the characteristic functions of the recorded content creation unit shown in FIG.

  As shown in the figure, when an event occurs during the interpretation / drawing of one BML document 300, a script for shifting the screen is executed, and the screen 302 is switched to the screen 304. With the screen change, the code value (function value) in the BML document is rewritten, but conventionally, only the code value is changed in one BML document 300.

  On the other hand, in the present invention, as shown in the lower side of FIG. 4, the BML document 300 is divided before and after the occurrence of the event. The BML document BML1 is a BML document before division (reference numeral 304), and when an event occurs, a BML document BML2 (reference numeral 306) is newly created, that is, divided. As described above, the recorded content creation unit 34 in FIG. 1 has a function of dividing one BML document before and after an event. An example of a specific method for dividing the BML document 300 according to the present invention is shown in FIG.

  5A shows a BML document before execution of script processing (BML1 in FIG. 4), and FIG. 5B shows a BML document after execution of script processing (BML2 in FIG. 4). It is a thing. Note that the two descriptions enclosed in the dotted line in FIG. 5B (the description related to the constant “i” and the description related to the attribute value “src”) have been rewritten from the BML document (BML1) before execution of the script processing. Corresponds to the location. Referring to the screen transition of FIG. 4, when the script processing is executed on the BML document (BML2) rewritten as shown in FIG. 5B, the description of the BML document (BML1) of FIG. Instead of switching to the screen 304 via the screen 302 as in the case of executing script processing, the screen 304 is displayed immediately after execution. As described above, according to the present invention, a BML document reflecting a script process generated when a certain event occurs is divided and created each time the event occurs.

  In addition, the recorded content creation unit 34 includes at least a code value indicating a state immediately after the display is switched as a result of the script processing that is triggered by the event, in the BML document after the event occurrence time. Process. Where the expression “record code value indicating the state immediately after” is intended, it is not always necessary to record the history of the script for moving the screen, but the content of the script indicating the state immediately after switching is always It means that it will be recorded.

  FIG. 6 is a diagram for explaining the recording form of the BML document included in the data broadcast content in the receiver having the data broadcast recording / playback function of FIG. In addition, what is described as a key event in the figure means an event generated by a user's key operation.

  As shown in the figure, four events E1 to E4 are sequentially generated from 9:00 to 9:20. At this time, one BML document (bml1) included in the broadcast content is divided into four BML documents (bml1-1) to (bml-4) and recorded with an event as a boundary. Each of bml1-1 to 4 does not divide the code of bml1, but edits a part of the code of bml1. For example, in the code of bml1-2, a description regarding the display mode instructed to be displayed by the key event is reflected in the code, and is different from the code of bml1 in the description part.

  In other words, every time an event occurs, a program (BML document) for displaying and outputting a data broadcast is sequentially created. Therefore, it is possible to program as many times as there are timings, and as described above, the created program reflects the contents processed at that timing in the program.

  Examples of the created program (BML document) are as follows. In other words, in the case of a timer event that displays image 1 after 10 seconds have elapsed, the current time value (originally a variable) returned by the function count_time that measures the elapsed time is set to a constant 10 (s), so that the program is executed. Sometimes image 1 is displayed immediately without waiting for 10 seconds.

  In addition, in the case of processing for displaying different images according to one option selected by the user from a plurality of options, the function user_select that accepts the selection by the user returns a numerical value (originally a variable) corresponding to the option that is a constant. By doing so, a plurality of options are displayed again when the program is executed, and an image corresponding to the constant is displayed without accepting selection by the user.

  FIG. 7 is a flowchart showing an operation procedure of the receiver having the data broadcast recording / playback function of FIG. 1 from reception to recording of the data broadcast content.

  As shown in the figure, the received TS (transport stream) is acquired (step S400), the content is acquired (step S401), the event occurrence is monitored (step S402), and the event information is recorded (step S402). Along with step S403), the content created by dividing the BML document is stored (step S404), and then a new TS is created (step S405).

  Further, when the event type and the event occurrence time are stored in association with the divided BML document, for example, it is convenient to generate an event list as shown in FIG. In the list of FIG. 10, numbers, times when events occur, event types, titles, and file names (names of BML documents) are described in a table format.

  FIG. 8 is a diagram for explaining data broadcast content playback processing in the receiver having the data broadcast recording / playback function of FIG.

  As shown in the drawing, four events E1 to E4 are sequentially generated from 9:00 to 9:20. Even if the user jumps from the content at about 9: 2 to the content at about 9:17 and desires cue playback, conventionally, as shown in the middle part of FIG. Could only be processed sequentially.

  On the other hand, in the receiver of the present invention of FIG. 1, as shown in the lower part, it is possible to perform a cue reproduction by directly transitioning from bml1-1 to bml1-4 stored separately.

  FIGS. 9A and 9B are flowcharts showing an operation procedure at the time of reproduction of data broadcast contents of a receiver having a data broadcast recording and reproduction function, and FIG. 9A is a conventional procedure as a comparative example. (B) is a flowchart showing the processing procedure of the present invention.

  As shown in (a), conventionally, data is read from a recording medium to obtain a TS (transport stream) (step S500), contents are obtained (step S501), and contents are sequentially displayed (step S501). Step S502).

  On the other hand, in the receiver of the present invention shown in FIG. 1, as shown in (b), TS is acquired (step S600), and it is determined whether or not cue reproduction is performed (step S601). If normal playback, the process proceeds to step S603. If cue playback, the content name is acquired from the event list as shown in FIG. 10 (step S602), the content is acquired (step S603), and the display of the content is performed. Is performed (step S604).

(Second Embodiment)
In the present embodiment, a user interface for cue playback when the present invention is applied to a mobile phone terminal capable of viewing one-segment broadcasting will be described.

  FIG. 11 is a diagram for explaining an example (screen transition example) of a user interface for cue playback in a mobile phone terminal capable of viewing one-segment broadcasting.

  As shown on the left side of FIG. 11, a screen G1 is displayed on the liquid crystal display on the mobile phone terminal. When the user presses a cue key (not shown) (steps S1 and S2), the screen shifts to screens G2 and G3 as shown in the middle or upper part of the center of FIG.

  That is, the recorded event list (a part of the data shown in FIG. 10) is displayed. On the screen G2, the event list is displayed in the data broadcasting area, and on the screen G3, a pop-up display is made.

  Next, when the user selects data to be reproduced from the event list (steps S3 and S4), the next screen G4 according to the selection is displayed.

  In addition, when the user presses an arrow key (not shown) while the screen G1 is displayed, the screen G4 can be directly transitioned to (step S5).

  As described above, by utilizing the existing keys of the mobile phone terminal, the list display on the display screen, and the like, the user can comfortably perform the cue playback of the data broadcast.

  As described above, according to the present invention, it is possible to cue and reproduce data broadcast contents, the performance of a data broadcast receiver (such as a TV or mobile terminal capable of viewing data broadcasts) is improved, and user convenience is improved. improves.

  INDUSTRIAL APPLICABILITY The present invention has an effect of enabling cue playback of data broadcast contents, and therefore has a data broadcast recording / playback function (including TV receivers and mobile terminals such as mobile phone terminals and PDAs). It is suitable for use.

The block diagram which shows the structure of the receiver which has the data broadcast recording and reproducing function of this invention A diagram for explaining the contents of data broadcasting content transmitted from a broadcasting station Illustration for explaining the types of events that trigger display changes The figure for demonstrating the characteristic function of the recorded content preparation part shown by FIG. An example of a specific method of dividing a BML document by a receiver having a data broadcast recording / playback function according to the present invention (a) shows a BML document before execution of script processing. (B) shows a BML document after execution of script processing. Figure showing The figure for demonstrating the recording form of the BML document contained in a data broadcasting content in the receiver with the data broadcasting recording and reproducing function of FIG. The flowchart which shows the operation | movement procedure from reception of a data broadcast content to recording of the receiver with the data broadcast recording and reproducing function of FIG. The figure for demonstrating the reproduction | regeneration processing of a data broadcasting content in the receiver with the data broadcasting recording / reproducing function of FIG. (A), (b) is a flowchart which shows the operation | movement procedure at the time of the reproduction | regeneration of data broadcasting content of the receiver with a data broadcasting recording / reproducing function, (a) shows the procedure of the prior art example as a comparison. It is a flow figure, and (b) is a flow figure showing the processing procedure of the present invention. Figure showing an example of an event list The figure for demonstrating an example (screen transition example) of the user interface for the cue reproduction | regeneration in the mobile telephone terminal which can view 1Seg broadcasting The figure which shows the outline of the transport stream (TS) of digital broadcasting Diagram showing an example of data carousel structure

Explanation of symbols

AN antenna 10 Tuner 11 PID filter 12 AV decoder 13 Data broadcast decoder 15 Display / operation control unit 16 Monomedia decoder 17 Content manager 18 BML browser 19 Frame memory 20 Display device 22 Input device 30 Broadcast recording control unit 32 Event recording unit 34 Recording Content creation unit 36 Recording processing unit 40 Multiplexer 42 Recording medium 44 Demultiplexer 46 Video / audio decoder 48 Data reproduction processing unit

Claims (2)

Receives data broadcasting content transmitted from a broadcasting station, acquires a module including a BML (Broadcast Markup Language) document, interprets the BML document by a BML browser, displays the content according to the BML document, and The display content is changed in response to an event, and the BML document and data including information on monomedia data referred to by the BML document are recorded on the recording medium, and the recorded data is read from the recording medium and reproduced. A receiver having a data broadcast recording / playback function,
An event recording unit that records information on the event received by the BML browser and time information indicating the time when the event occurred;
When the BML browser interprets one BML document and the event occurs, the BML document is divided before and after the event occurs, and after the divided event occurs. A recording content creation unit that records a code value indicating a state immediately after the display is switched as a result of the script processing that is triggered by the event in the BML document, thereby creating a data content for recording;
A recording processing unit that records data including the event information and time information recorded by the event recording unit and a recording content created by the recording content creation unit on the recording medium;
When a playback processing command specifying a playback time point is received, the event information and the time information recorded on the recording medium are referred to, and the BML document corresponding to the specified playback time point is started. A playback processing unit that performs cue playback processing to start playback;
A data broadcast receiver comprising: The reproduction processing unit, when receiving a reproduction processing command designating a reproduction time point, performs a search using the event information and the time information as index information, and selects the plurality of divided BML documents from the divided BML documents. 2. The data broadcast receiver according to claim 1, wherein a BML document corresponding to a designated reproduction time point is detected, and a cue reproduction process for starting reproduction from the head of the BML document is performed .

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