EP3098985A1 - Digitaler rundfunkempfänger - Google Patents

Digitaler rundfunkempfänger Download PDF

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Publication number
EP3098985A1
EP3098985A1 EP16164258.2A EP16164258A EP3098985A1 EP 3098985 A1 EP3098985 A1 EP 3098985A1 EP 16164258 A EP16164258 A EP 16164258A EP 3098985 A1 EP3098985 A1 EP 3098985A1
Authority
EP
European Patent Office
Prior art keywords
image
slide show
divided data
data
show data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16164258.2A
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English (en)
French (fr)
Inventor
Masashi Takaoka
Ryo Sukegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alpine Electronics Inc
Original Assignee
Alpine Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alpine Electronics Inc filed Critical Alpine Electronics Inc
Publication of EP3098985A1 publication Critical patent/EP3098985A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/42—Arrangements for resource management
    • H04H20/426—Receiver side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the present invention relates to a digital broadcasting receiver that receives program data according to digital audio broadcasting (DAB) broadcasting standard, and the like.
  • DAB digital audio broadcasting
  • DAB receivers that receive digital radio broadcasting conforming to an European standard are known (for example, see Patent Literature 1).
  • the DAB receivers have a function of slide show to display images, which are being sent, in order of receipt, in addition to a function to receive broadcasting data and output audio.
  • This slide show receives slide show data having a predetermined capacity (8 Kbytes), to which segment numbers in ascending order are allocated, in numerical order, and displays one image when a capacity reaches data capacity of the one image (up to 50 Kbytes). In this way, an image to be displayed is sequentially updated every time receipt of data of each one image is completed.
  • Patent Literature 1 JP 2011-114478 A
  • the present invention has been made in view of the foregoing, and an objective of the present invention is to provide a digital broadcasting receiver that can suppress the delay of the updating period of image.
  • the invention relates to a digital broadcasting receiver according to claim 1. Embodiments are disclosed herein below and in the dependent claims.
  • a digital broadcasting receiver that receives a plurality of divided data and displays an image, the divided data being obtained such that image data necessary for displaying one image is divided and distributed, includes a data receiving unit configured to receive the divided data in distributed order, a divided data storing processing unit configured to store the divided data received by the data receiving unit to a storage unit having a predetermined capacity, and an image display unit configured to read and display the plurality of divided data from the storage unit, after the plurality of divided data corresponding to one image is received and stored in the storage unit.
  • the divided data storing processing unit discards the divided data corresponding to the first image stored in the storage unit until then, and starts an operation to store the divided data corresponding to the second image to the storage unit.
  • a data amount of each image is determined for each image, and the divided data storing processing unit desirably discards the divided data corresponding to the first image stored in the storage unit until then, when the first divided data corresponding to the second image has been received before a total value of received data amounts of the divided data corresponding to the first data reaches the data amount of the first image. Accordingly, whether discarding the divided data can be easily determined based on a result of comparison between the total value of the data amounts of the received divided data and the data amount of the image.
  • the plurality of divided data is associated with identification information that identifies a corresponding image
  • the divided data storing processing unit desirably identifies which of the first and second images the divided data corresponds, based on the identification information. Accordingly, which image the divided data corresponds can be easily determined.
  • the divided data storing processing unit desirably withholds the discard of the divided data corresponding to the first image stored in the storage unit until then, when the first divided data corresponding to the second image has been received by the data receiving unit and a capacity of an unused area of the storage unit is a predetermined value or more at that point, before the receipt of the plurality of divided data corresponding to the first image is completed.
  • the predetermined value is desirably the same as the data amount of the divided data.
  • the divided data storing processing unit desirably discards the divided data, after instructing the display unit to display the first image using the divided data before discarding the divided data corresponding to the first image stored in the storage unit until then, when the first divided data corresponding to the second image has been received by the data receiving unit before the receipt of the plurality of divided data corresponding to the first image is completed. Accordingly, the first image, of which receipt of all the divided data is not completed, can be forcibly displayed, and lack of the entire first image can be avoided.
  • the predetermined capacity of the storage unit is desirably the same as a maximum data amount of one image. Accordingly, the capacity of the storage unit can be made small and reduction of cost can be achieved, and the delay of the updating period of image can be suppressed.
  • FIG. 1 is a diagram illustrating a configuration of a DAB receiver of an embodiment.
  • the DAB receiver of the present embodiment includes a tuner 10, a decoder 20, an output processing unit 22, an amplifier 24, a speaker 26, a control unit 30, a display unit 40, and an operation unit 42.
  • This DAB receiver is mounted on a vehicle.
  • the tuner 10 and the decoder 20 are used to receive a broadcasting program.
  • the tuner 10 and the decoder 20 receive a digital broadcasting signal (DAB broadcasting signal) broadcasted in a multi-carrier system using orthogonal frequency division multiplexing (OFDM) as a modulation system, and perform demodulation processing and decoding processing for the received signal to reproduce sound data.
  • DVB broadcasting signal digital broadcasting signal
  • OFDM orthogonal frequency division multiplexing
  • the tuner 10 includes a front end (F/E) 12 and an analog-digital converter (A/D) 14.
  • the front end 12 converts the broadcasting signal received through an antenna 16 into an intermediate frequency signal.
  • the analog-digital converter 14 converts the analog intermediate frequency signal into digital data (intermediate frequency data).
  • the decoder 20 performs demodulating processing and decoding processing for the intermediate frequency data, and extracts a service (an audio service or a data service) specified by a user by operating the operation unit 42.
  • the demodulating processing and the decoding processing are performed by the decoder 20.
  • the decoder 20 up to which part is processed in the analog processing and from which part is processed in the digital processing can be appropriately changed.
  • FIG. 2 is a diagram illustrating a frame configuration of the DAB broadcasting signal. As illustrated in FIG. 2 , a frame of the DAB broadcasting signal is configured from a synchronization channel, a first information channel FIC, and a main service channel MSC.
  • the synchronization channel is made of a NULL symbol and a phase reference symbol PRS, and is used to detect a head portion of the frame and synchronize the frame.
  • the first information channel FIC is an area that describes content of the main service channel MSC, and includes time/date data, array data of a service (program), a label (name) of a service, a service identification code SID, and the like.
  • a plurality of first information groups (FIGs) is energy-spread, and configures one first information block (FIB) that is a predetermined information unit. Further, each FIB is convolutionally encoded, and three convolutionally-encoded FIBs configure one FIG.
  • the main service channel MSC includes audio data and the like respectively corresponding to a plurality of services.
  • This main service channel MSC includes a plurality of energy-spread, convolutionally-encoded, and time-interleaved sub channels (SubChs).
  • the output processing unit 22 is input the audio data output from the decoder 20, and performs variable control of the volume, superimposing processing of another sound (for example, an operation sound), and the like.
  • the amplifier 24 amplifies the audio data output from the output processing unit 22 and outputs a sound after amplification from the speaker 26.
  • This conversion processing may be performed in the output processing unit 22.
  • a digital/analog converter may be provided in a subsequent stage of the output processing unit 22, and the conversion may be performed.
  • the control unit 30 controls a receiving operation of the entire DAB receiver and performs image display processing based on slide show data. Therefore, the control unit 30 includes a slide show data (SSD) extraction processing unit 32, a slide show data (SSD) buffer 34, and a slide show (SS) display processing unit 36.
  • SSD slide show data
  • SSD slide show data
  • SS slide show
  • the slide show data extraction processing unit 32 extracts slide show data from the frame of the DAB broadcasting signal received using the tuner 10 and the decoder 20, the slide show data being one of data services.
  • a slide show is images made of still images (JPEG data, bitmap data, or the like), moving images, and the like corresponding to sounds (music) being in output.
  • image data corresponding to still images, which are being sent is received and is displayed in order of receipt.
  • Image data corresponding to each image has a data amount of up to 50 Kbytes, and is configured from a plurality of slide show data, each slide show data being fixed length data of 8 Kbytes. Each image is associated with a different transport ID. Further, segment numbers in ascending order from "0" are attached to the plurality of slide show data that configures each image data, and a necessary number of the slide show data is received in order of the segment numbers "0", "1", "2” ....
  • the size (data amount) of each image data is included in the first information channel FIC as header information, and when a total value of the data amounts of the slide show data received in order of the segment numbers reaches the aforementioned size, receipt of all data of the image data is considered to be completed, and the processing is moved onto display processing.
  • the slide show data buffer 34 temporarily stores, before display, the slide show data received by the tuner 10 and the decoder 20, and extracted by the slide show data extraction processing unit 32.
  • the slide show data buffer 34 has the same capacity as 50 Kbytes that is the maximum data amount of one image.
  • the capacity of the slide show data buffer 34 may not necessarily be the same as 50 Kbytes that is the maximum data amount of one image.
  • the capacity of the slide show data buffer 34 is favorably 50 Kbytes, which is the minimum capacity by which one image can be reliably displayed, in the perspective of cost reduction.
  • the slide show data buffer 34 may be provided outside the control unit 30.
  • the slide show display processing unit 36 After the plurality of slide show data corresponding to one image is received and stored in the slide show data buffer 34, the slide show display processing unit 36 reads the plurality of slide show data from the slide show data buffer 34 and displays the plurality of slide show data in the display unit 40.
  • the slide show display processing unit 36 includes a video RAM (VRAM) 38 corresponding to a display screen of the display unit 40, and reads the plurality of slide show data corresponding to one image stored in the slide show data buffer 34 and writes the plurality of slide show data to the video RAM 38, so that the image display processing of the slide show for the display unit 40 is performed.
  • VRAM video RAM
  • the above-described tuner 10 and decoder 20 correspond to a data receiving unit
  • the slide show data extraction processing unit 32 corresponds to a divided data storing processing unit
  • the slide show data buffer 34 corresponds to a storage unit
  • the slide show display processing unit 36 corresponds to an image display unit, respectively.
  • the above-described slide show data corresponds to divided data
  • the transport ID corresponds to identification information that identifies an image, respectively.
  • the DAB receiver of the present embodiment has such a configuration. Next, an image display operation of the slide show will be described.
  • FIG. 3 is a flowchart illustrating an operation procedure of displaying images of a slide show in order of receipt.
  • the slide show data extraction processing unit 32 determines whether having received (extracted) the slide show data (step 100). In a case where no slide show data has been received, negative determination is performed and the determination is repeated.
  • the slide show data extraction processing unit 32 determines whether the segment number of the extracted slide show data is "0" (step 102). When the segment number is "0", that is, when first slide show data that configures the image data has been received, the affirmative determination is performed. In this case, the slide show data extraction processing unit 32 holds the transport ID corresponding to the slide show data (step 104). Further, the slide show data extraction processing unit 32 discards the slide show data of the transport ID held corresponding to a previous image, from the slide show data buffer 34 (step 106), and then stores the slide show data extracted this time to the slide show data buffer 34 (step 108).
  • the slide show data extraction processing unit 32 determines whether all the slide show data of the same transport ID have been completed (step 110). This determination is performed by checking whether the total value of the data amounts of the slide show data received in order of the segment numbers has reached the size of the image data corresponding to these slide show data. When unreceived slide show data exists, the negative determination is performed in the determination of step 110, and the processing is returned to step 100 and the receiving determination of the slide show data is repeated.
  • the slide show data extraction processing unit 32 determines whether the transport ID of the slide show data received this time is the same as the transport ID held before in step 104 (step 112). When the transports ID are the same, the affirmative determination is performed, and the processing is moved onto step 108 and the slide show data received this time is stored in the slide show data buffer 34. Meanwhile, when the transport ID is different, the negative determination is performed in the determination of step 112. In this case, the slide show data extraction processing unit 32 does not store the slide show data received this time and discard the data (step 114). Following that, the processing is returned to step 100, and the receiving determination of the slide show data is repeated.
  • step 110 the slide show display processing unit 36 reads all the slide show data corresponding to one image stored in the slide show data buffer 34, and displays the slide show data in the display unit 40 (step 116). Following that, the slide show display processing unit 36 (or the slide show data extraction processing unit 32) discards the slide show data in the slide show data buffer 34 (step 118). Following that, the processing is returned to step 100, and the receiving determination of the slide show data is repeated.
  • the DAB receiver of the present embodiment even when the slide show data corresponding to the second image is received before receipt of the slide show data (divided data) corresponding to the first image is completed, only the slide show data of the first image is discarded, and the second image can be displayed using the slide show data received thereafter. Therefore, the delay of the updating period of image can be suppressed, compared with a case where these two images are not displayed.
  • the data amount of each image is determined for each image, and when the first slide show data corresponding to the second image has been received before the total value of the received data amounts of the slide show data corresponding to the first image reaches the data amount of the one image, the slide show data corresponding to the first image stored in the slide show data buffer 34 until then is discarded. In this way, whether the slide show data is discarded can be easily determined based on a comparison result of the total value of the data amounts of the received slide show data and the data amount of the image.
  • the plurality of slide show data is associated with the transport ID as the identification information that identifies the corresponding image, and the slide show data extraction processing unit 32 identifies which image the slide show data corresponds, based on the transport ID. Accordingly, which image the slide show data corresponds can be easily determined.
  • the storage capacity of the slide show data buffer 34 is set equal to the maximum data amount of one image (for example, 50 Kbytes). Accordingly, the storage capacity of the slide show data buffer 34 can be made small and the cost reduction can be achieved, and the delay of the updating period of image can be suppressed.
  • FIG. 4 is a flowchart illustrating an operation procedure of a modification of displaying images of a slide show in order of receipt.
  • a data amount of each image is up to 50 Kbytes. However, it is rare that image data of that data amount is sent, and typically the image data is about 20 to 30 Kbytes. Therefore, it can be considered that, when the data amount of a first image is small and there is a sufficient free space in a slide show data buffer 34, slide show data of the first image may not be immediately discarded because the slide show data of a second image has been received.
  • the operation procedure illustrated in FIG. 4 reflects the above idea.
  • the operation procedure illustrated in FIG. 4 is different from the operation procedure illustrated in FIG. 3 in that step 105 is added to between steps 104 and 106, and steps 112 and 114 are replaced with step 112A.
  • step 105 is added to between steps 104 and 106
  • steps 112 and 114 are replaced with step 112A.
  • description will be given, focusing on operations of these added and
  • a slide show data extraction processing unit 32 determines whether the slide show data buffer 34 has a free space (a capacity of an unused area is a predetermined value or more) (step 105). For example, since the data amount of each slide show data is 8 Kbytes, when the free space is 8 Kbytes or more (the capacity being in use of the slide show data buffer 34 is 42 Kbytes or less), one slide show data can be stored in the slide show data buffer 34.
  • the slide show data extraction processing unit 32 stores the slide show data extracted this time to the slide show data buffer 34. Further, when the free space is smaller than the predetermined value, negative determination is performed in the determination of step 105. In this case, the processing is moved onto step 106, and the slide show data extraction processing unit 32 discards the slide show data of the transport ID held corresponding to a previous image, from the slide show data buffer 34.
  • the slide show data extraction processing unit 32 determines whether the slide show data buffer 34 has a free space (the capacity of the unused area is a predetermined value or more, this free space is 8 Kbytes, which is the same as the case of step 105) (step 112A).
  • the free space is the predetermined value or more
  • the affirmative determination is performed and the processing is moved onto step 108
  • the slide show data extraction processing unit 32 stores the slide show data extracted this time to the slide show data buffer 34.
  • the negative determination is performed in the determination of step 112A. In this case, the processing is moved onto step 106, and the slide show data extraction processing unit 32 discards the slide show data of the transport ID held corresponding to a previous image, from the slide show data buffer 34.
  • the discard of the slide show data is withheld when there is a sufficient free space of the slide show data buffer 34, so that first image may be able to be displayed. In this case, lack of an image can be avoided.
  • FIG. 5 is a flowchart illustrating an operation procedure of another modification of displaying images of a slide show in order of receipt.
  • the slide show data corresponding to the first image is discarded.
  • the first image may be forcibly displayed before the slide show data is discarded.
  • the image data of the first image is in the bitmap format, or the like, even if a part of slide show data is unreceived, the first image (having a partial deficit) can be displayed using received slide show data.
  • the operation procedure illustrated in FIG. 5 is different from the operation procedure illustrated in FIG. 3 in that step 105A is added to between steps 104 and 106.
  • step 105A is added to between steps 104 and 106.
  • a slide show display processing unit 36 reads the slide show data of the transport ID held corresponding to a previous image, from a slide show data buffer 34, and displays the slide show data in a display unit 40 (step 105A). Following that, the processing is moved onto step 106, and a slide show data extraction processing unit 32 discards the slide show data of the transport ID held corresponding to the previous image, from the slide show data buffer 34.
  • the first image of which receipt of all the slide show data is not completed, is forcibly displayed, whereby lack of the first image can be avoided even when the slide show data corresponding to the second image is received first.
  • the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims of the present invention.
  • a case of realizing the function of a slide show by the DAB receiver has been described.
  • the present invention can be applied to a case of displaying one image after a plurality of divided data, which is to be received in order, is received in other receivers.
  • the present invention even if the divided data corresponding to the second image is received before the receipt of the divided data corresponding to the first image is completed, only the divided data of the first image is discarded, and the second image can be displayed. Therefore, the delay of the updating period of image can be suppressed, compared with a case where these two images cannot be displayed.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Circuits Of Receivers In General (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
EP16164258.2A 2015-05-29 2016-04-07 Digitaler rundfunkempfänger Withdrawn EP3098985A1 (de)

Applications Claiming Priority (1)

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JP2015110426A JP6407098B2 (ja) 2015-05-29 2015-05-29 デジタル放送受信機

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EP3098985A1 true EP3098985A1 (de) 2016-11-30

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090094651A (ko) * 2008-03-03 2009-09-08 엘지전자 주식회사 디지털 멀티미디어 방송에서 프리젠테이션 제어정보 제공방법
JP2011114478A (ja) 2009-11-25 2011-06-09 Alpine Electronics Inc デジタルラジオ放送受信装置
US20120189069A1 (en) * 2009-04-15 2012-07-26 Ibiquity Digital Corporation Systems and Methods for a Multiport Synchronous-Asynchronous Client for Scheduling and Delivering Content for Digital Radio Broadcast Transmission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001195807A (ja) * 2000-01-06 2001-07-19 Nikon Gijutsu Kobo:Kk 録画装置
JP4624854B2 (ja) * 2005-05-27 2011-02-02 株式会社三共 画像処理装置
JP5490564B2 (ja) * 2010-02-24 2014-05-14 アルパイン株式会社 デジタルオーディオ放送受信装置及びデジタルオーディオ放送受信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090094651A (ko) * 2008-03-03 2009-09-08 엘지전자 주식회사 디지털 멀티미디어 방송에서 프리젠테이션 제어정보 제공방법
US20120189069A1 (en) * 2009-04-15 2012-07-26 Ibiquity Digital Corporation Systems and Methods for a Multiport Synchronous-Asynchronous Client for Scheduling and Delivering Content for Digital Radio Broadcast Transmission
JP2011114478A (ja) 2009-11-25 2011-06-09 Alpine Electronics Inc デジタルラジオ放送受信装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Digital Audio Broadcasting (DAB); MOT Slide Show; User Application Specification European Broadcasting Union Union Européenne de Radio-Télévision EBU.UER; ETSI TS 101 499", TECHNICAL SPECIFICATION, EUROPEAN TELECOMMUNICATIONS STANDARDS INSTITUTE (ETSI), 650 ROUTE DES LUCIOLES, SOPHIA ANTIPOLIS CEDEX, F-06921, FRANCE, vol. BC, no. V2.1.1, 1 January 2006 (2006-01-01), XP014032285 *

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