JP2006332958A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver capable of presenting a data broadcast to a user when a broadcast can not be received. <P>SOLUTION: A CPU 11 performs processing for recording the contents of a data broadcast in an NVRAM 8 when the data broadcast is received. The CPU 11 stores the contents in an area of the NVRAM 8 for a channel 1 when data broadcast of the channel 1 is received. When no broadcast can be received, the CPU 11 reads the data broadcast data out of the NVRAM 8 and presents them. Namely, video and audio of a program can not be displayed since the broadcast can not be received, but the data broadcast contents which were recorded in the past can automatically be displayed on a screen. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver capable of receiving a data broadcast.

  A digital broadcast receiver that receives digital broadcasts using satellites (CS, BS) or terrestrial waves selects any broadcast wave from a plurality of broadcast waves received through a dedicated antenna or terrestrial antenna by a tuner. Then, an arbitrary channel is selected from among a plurality of channels included in the selected broadcast wave by demultiplexing processing, a digital signal of the selected channel is taken out, and a video / audio signal is output by decoding it. .

  In such digital broadcasting, data broadcasting is performed in addition to video / audio broadcasting of programs. In the receiver that receives the data broadcast, after the channel selection process, the data broadcast data (content) is stored in the cache memory and an image is displayed based on the data broadcast data.

As a related art related to data broadcasting, there is one that allows data broadcasting to be viewed later by recording the data broadcasting (see Patent Document 1).
JP 2002-44547 A

  In the prior art of the above publication, a user operation based on the user's will to view the stored data broadcast data (content) is required. For example, when nothing is displayed on the screen due to the inability to receive, it is sufficient if the will to play and watch the data broadcast accumulated in the past works. If it does not work (if you have forgotten to store data broadcast data), you can give up watching the broadcast.

  In view of the above circumstances, an object of the present invention is to provide a digital broadcast receiving apparatus that can present a data broadcast to a user when the broadcast cannot be received.

  In order to solve the above-described problems, a digital broadcast receiving apparatus of the present invention caches data broadcast content in the digital broadcast reception apparatus capable of interpreting and displaying data broadcast content obtained by receiving digital broadcast. A rewritable non-volatile recording medium provided separately from the memory to be used, writing means for writing the content of the data broadcast on the non-volatile recording medium, and interpreting and displaying the content read from the non-volatile recording medium Means for reading the content of the data broadcast from the non-volatile recording medium and displaying a data broadcast screen when the broadcast cannot be received.

  With the above configuration, data broadcast can be presented to the user when the broadcast cannot be received. That is, even when the user forgets to store the data broadcast data, the data broadcast can be viewed.

  In the digital broadcast receiving apparatus configured as described above, the content of the data broadcast may be recorded on the nonvolatile recording medium for each channel. If the contents of all channels are stored in one area, only the contents of a certain channel may be stored. However, by preparing a recording area for each channel, data broadcasting contents of each channel are stored. Can be held.

  The digital broadcast receiving apparatus of the present invention is a digital broadcast receiving apparatus capable of interpreting and displaying data broadcast content obtained by receiving digital broadcast, and is provided separately from a memory for caching data broadcast content. A rewritable nonvolatile recording medium, a writing means for writing the content of the data broadcast on the nonvolatile recording medium, a means for interpreting and displaying the content read from the nonvolatile recording medium, and the data broadcasting A list selected by the user, which includes means for creating a recording list of the content and recording the content on the nonvolatile recording medium, reading the recording list from the nonvolatile recording medium when the broadcast cannot be received, and displaying it on the screen The data broadcasting content of the data and display the data broadcasting screen Characterized in that it is configured urchin.

  Even in the above configuration, even if the broadcast cannot be received, the data broadcast can be presented to the user. That is, even if the user forgets to store the data broadcast data, the data broadcast content recording list is presented, and the data broadcast can be viewed on the list selected from the list.

  In the digital broadcast receiving apparatus having these configurations, the network connection function is provided, and the network connection is performed when an operation is performed on predetermined information on the content of the data broadcast read and displayed from the nonvolatile recording medium. It should be configured to connect to a site on the network by function.

  According to the present invention, it is possible to present a data broadcast to the user when the broadcast cannot be received.

  A digital broadcast receiver according to an embodiment of the present invention will be described below with reference to FIGS. The digital broadcast receiving apparatus according to this embodiment is configured as a portable type (for example, a portable apparatus having a cellular phone function) or an in-vehicle type, but is not limited thereto.

  The tuner 1 extracts a signal having a specific frequency from the received high frequency digital modulation signal. Further, the tuner includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, thereby demodulating the selected digital modulation signal and outputting a transport stream.

  The demultiplexer (DEMUX) 2 separates the transport stream received from the tuner into, for example, a stream such as an MPEG2 (Moving Picture Experts Group 2) video stream or audio stream, and section data. Further, the section data is separated into PSI / SI (Program Specific Information / Service Information) and a data carousel.

  The audio decoder 3 decodes the encoded signal output from the demultiplexer 2, further performs D / A conversion to generate an audio signal, and supplies the audio signal to an audio output unit (speaker or the like) (not shown). The video decoder 4 decodes the input encoded signal to obtain a quantization coefficient and a motion vector, performs inverse DCT transformation, motion compensation control based on the motion vector, etc., generates video data, and draws this video data This is supplied to the processing unit 5. The drawing processing unit 5 adjusts the size and resolution of the image, and synthesizes the video supplied from the browser with the received video. A video (for example, a television video and a data broadcast video) is displayed on the monitor 6 (see FIG. 2) by the video signal output from the drawing processing unit 5.

  The I / O circuit 7 is connected with operation buttons and the like shown in the figure. The communication I / F 12 is connected to a telephone function unit (a mobile phone function unit if configured as a mobile device) or a LAN function unit (a wireless LAN function unit if configured as a mobile device). . The ROM 9 stores an operation program for the CPU 11 and the like.

  Here, the CPU 11 is responsible for processing of a PSI / SI processing unit, a data carousel reception processing unit, a data broadcast content recording processing unit, and a BML browser. In this embodiment, the RAM 10 is used for developing various programs of the CPU 11 and also functions as a cache memory for data broadcast contents. In addition, in the NVRAM 8, which is a non-volatile recording medium, data broadcast data (content) is stored in addition to SI processing information and the like.

  The CPU 11 as a PSI / SI processing unit inputs PSI / SI and processes it so that it can be used for an EPG (Electronic Program Guide) or the like. The CPU 11 as a data carousel reception processing unit processes the separated data carousel to acquire data broadcast contents, and supplies the data broadcast content to the RAM 10 as a cache memory. The CPU 11 as a content recording processing unit performs a process of recording the data broadcast content in the NVRAM 8 and a process of reading the data broadcast content from the NVRAM 8. The RAM 10 serving as a cache memory temporarily stores data broadcast content.

  The BML browser is activated when data broadcasting is displayed. In data broadcasting, an attempt is first made to acquire a startup module (moduleID = 0) included in an entry component, and a screen is created based on the obtained startup document. Then, when the user operates various buttons (such as “weather forecast” and “news”) on the startup screen, the lower layer display is executed.

  Further, the BML browser takes out a document (data) to be displayed from the RAM 10 which is a cache memory. If there is no document (data) to be displayed in the RAM 10, the data carousel reception processing unit extracts it from the transport stream. The data carousel reception processing unit takes out data transmitted by a DSM-CC (digital storage media command and control) method.

  In the BML document, each module transmitted by the data carousel method uses the following name space to uniquely identify each module. arib-dc: // <original_network_id>. <transport_stream_id>. <service_id> [; content_id>] [. <event_id>] / <component_tag> / <moduleName> [/ <resourceName >]

  The original_network_id is an identifier unique to the network, and identifies the ground, BS, and CS. transport_stream_id is assigned to the TS. In terrestrial digital broadcasting, the same value as the network_id value is used. service_id is an identifier for identifying each service in the network. component_tag is a base point of contents such as weather forecasts and news, and data is stored after this tag. Components, arrays, image data, etc. that make up the content are stored under moduleName.

  The CPU 11 performs overall control in the digital broadcast receiving apparatus. As described above, as the control according to the present invention, the CPU 11 performs recording processing and presentation processing of data broadcast content. That is, the CPU 11 performs a process for recording the content in the NVRAM 8 when receiving and displaying the data broadcast. Here, as shown in FIG. 2, the NVRAM 8 has a content storage area for each channel. Therefore, for example, if the data broadcast of channel 1 is received, the CPU 11 stores the content in the area for channel 1 of the NVRAM 8.

  As described above, the data broadcasting content is transmitted by the DSM-CC data carousel system defined by ARIB STD-B24, and unlike the stream type transmission system such as video / audio, the same data is repeated for a certain period. By sending the data, the receiver can acquire data at an arbitrary timing. Here, a set of data repeatedly transmitted is called a data carousel, and each data is called a module. The data carousel includes DII (Download Info Indication), DDB (Download Date Block), and the like.

  A channel corresponding to a channel in normal broadcasting is called a service. 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).

  The content recording process performed by the CPU 11 will be described in some detail. The data broadcast content data processed by the CPU 11 as the data carousel reception processing unit is written in the RAM 10 as the cache memory and also in the NVRAM 8. On the other hand, when data broadcast content is reproduced, the data broadcast content read from the NVRAM 8 is expanded in the RAM 10 serving as a cache memory, and is presented after being interpreted / processed by the BML browser.

  Here, as described above, the component transmits directory information called DII and a plurality of modules serving as data entities. These data are repeatedly transmitted. Modules required for presentation of data broadcasting are stored in the RAM 10 as a cache memory in the receiving apparatus, and modules that are no longer needed are deleted from the RAM 10.

  The DII is updated when the total number of modules included in the data carousel changes, when at least one module is updated, and when local content is switched. In order to identify the version of DII, DII includes a transaction identification (transaction_id), and if there is a change in the contents of DII, transaction_id is updated. Further, when the version of the module changes, the module that has been transmitted before that becomes unnecessary, and a new version of the module is received. The DII also includes a data event identification (data_event_id).

  The content transmitted in the data carousel may be updated in time. A meaningful piece of content transmitted in a certain period of 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.

  With the above mechanism, the receiving device can monitor the DII to know which module is currently transmitted and recognize the update of the module. Therefore, the contents of the RAM 10 and the NVRAM 8 in the receiving device are always stored. You can keep it up to date. Note that the writing to the NVRAM 8 is executed when the above-described meaningful content (local content) is obtained.

  Even when the reception of the data broadcast is completed, the CPU 11 does not delete the content stored in the NVRAM 8. Even when the data broadcasting reception channel is changed, the CPU 11 does not erase the content stored in the NVRAM 8 for the channel before the change, but stores the content for the channel after the change in the NVRAM 8 area for the channel. When the recording area for a certain channel becomes full, the old content is deleted, and the new content is stored in the free area. If the contents of every channel are stored in one area instead of each channel, only the contents of a certain channel may be stored, but a recording area is prepared for each channel. Thus, the data broadcast content of each channel can be held. The NVRAM 8 may store a data broadcast reception history (storage list). In this reception history, the information of the data broadcast contents (storage date and time, data broadcast name, etc.) stored in the NVRAM 8 may be recorded for each channel. When deleting old contents from the NVRAM 8, the reception history (storage list) is also deleted.

  The storage of the data broadcast content in the NVRAM 8 is not limited to being performed when the data broadcast is received and displayed. When there is no viewing by the user, for example, channel search may be executed (no video presentation on the screen is necessary), and this may be recorded when data broadcast content can be acquired by this channel search. Further, such acquisition of data broadcast content (including the above channel search and the like) may be periodically executed.

  Next, presentation of data broadcast contents recorded in the NVRAM 8 will be described with reference to the flowchart of FIG. This flowchart also shows a data broadcast content storage process. When the reception of the digital broadcast is started, it is determined whether or not the digital broadcast radio wave is normally received (step S1). For example, the CPU 11 obtains information such as the electric field strength of the received radio wave, the C / N ratio, and the error rate from the tuner 1. When it is determined that radio waves can be normally received, decoding processing is performed (step S2). Then, it is determined whether there is data broadcasting (step S3). If there is a data broadcast, the content of the data broadcast is stored (step S4), and the data broadcast content is displayed on the screen together with the audio and video of the program (step S5). On the other hand, when there is no data broadcast, only the video and audio of the program are displayed on the screen (step S6).

  When it is determined in step S1 that radio waves cannot be received normally, it is determined whether there is a data broadcast reception history (step S7). If there is a data broadcast reception history (storage list), The data broadcast content is read from the NVRAM 8 and presented. That is, in this case, since the broadcast cannot be received, the video and audio of the program cannot be displayed, but the data broadcast content recorded in the past is automatically displayed on the screen (step S8). ). If there is no data broadcast reception history, exception processing (for example, message display processing such as “cannot be received”) is executed (step S9). In step S7, if there is no data broadcast reception history of the same channel as the channel to be received, no history is set.

  In the data broadcasting content, information (such as a URL) specifying the location of the information resource may be embedded. When the digital broadcast receiving apparatus is configured to perform communication by a telephone function, it can connect to a resource on the network by the URL, receive this resource, and present it on the screen.

  In the above example, data broadcast contents recorded in the past when the broadcast cannot be received are automatically displayed on the screen. However, when the broadcast cannot be received, the data broadcast reception history (storage list) is displayed. First, it may be displayed on the screen. This history is assumed to be a data broadcast reception history of the same channel as the channel to be received. For example, when “data broadcast A” and “data broadcast B” exist as a history (list) for channel 1, the user selects either by moving the cursor (highlight) or pressing the enter button, for example. Can do. For example, when the user selects “data broadcast B”, the content of the data broadcast B is read from the NVRAM 8 and presented on the screen.

  In the above example, the data broadcast of the same channel as the channel to be received is presented to the user. However, the present invention is not limited to this.

  In addition, when presenting data broadcast content recorded in the past, the data broadcast recorded in the past, such as displaying the date and time of acquisition or displaying a message such as “Past data” is displayed. Users should be notified that content is being presented.

It is a block diagram which shows the digital broadcast receiver of embodiment of this invention. It is explanatory drawing which showed the outline | summary of accumulation | storage and presentation of data broadcasting content. It is the flowchart which showed the processing content.

Explanation of symbols

1 Tuner 2 Demultiplexer 8 NVRAM
10 RAM
11 CPU

Claims (4)

In a digital broadcast receiving apparatus capable of interpreting and displaying data broadcast content obtained by receiving digital broadcast, a rewritable nonvolatile recording medium provided separately from a memory for caching data broadcast content, A writing means for writing the content of the data broadcast on the nonvolatile recording medium; and a means for interpreting and displaying the content read from the nonvolatile recording medium, and the nonvolatile recording medium when the broadcast cannot be received. A digital broadcast receiver configured to read the content of the data broadcast from and display a data broadcast screen. 2. The digital broadcast receiving apparatus according to claim 1, wherein the content of the data broadcast is recorded on the nonvolatile recording medium for each channel. In a digital broadcast receiving apparatus capable of interpreting and displaying data broadcast content obtained by receiving digital broadcast, a rewritable nonvolatile recording medium provided separately from a memory for caching data broadcast content, Writing means for writing the content of the data broadcast on a nonvolatile recording medium; means for interpreting and displaying the content read from the nonvolatile recording medium; and creating a recording list of the content of the data broadcast to generate the nonvolatile content Means for recording on a recording medium, and when the broadcast cannot be received, the recording list is read from the non-volatile recording medium and displayed on the screen, and the content of the data broadcast of the list selected by the user is read and data A digital camera that is configured to display a broadcast screen Le broadcast receiver. 4. The digital broadcast receiving apparatus according to claim 1, wherein the digital broadcast receiving apparatus has a network connection function and operates on predetermined information on data broadcast content read and displayed from the nonvolatile recording medium. The digital broadcast receiving apparatus is configured to connect to a site on the network by the network connection function when the communication is performed.

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