WO2011118206A1 - デジタル放送受信処理装置 - Google Patents
デジタル放送受信処理装置 Download PDFInfo
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- WO2011118206A1 WO2011118206A1 PCT/JP2011/001695 JP2011001695W WO2011118206A1 WO 2011118206 A1 WO2011118206 A1 WO 2011118206A1 JP 2011001695 W JP2011001695 W JP 2011001695W WO 2011118206 A1 WO2011118206 A1 WO 2011118206A1
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- 238000012545 processing Methods 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000002194 synthesizing effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/28—Systems using multi-frequency codes with simultaneous transmission of different frequencies each representing one code element
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
Definitions
- the present invention relates to a diversity reception type digital broadcast reception processing apparatus, and more specifically, has a plurality of demodulation units, and uses a predetermined number of demodulation units among the plurality of demodulation units for main processing when performing two processes simultaneously.
- the present invention relates to a digital broadcast reception processing apparatus that can divide the remaining demodulator so as to be used for sub-processing.
- Some conventional broadcast receiving apparatuses adopt a diversity reception system suitable for mobile reception, and have been able to obtain a stable high reception level by synthesizing received signals. For this reason, a device has been devised to eliminate signals that are highly likely to generate noise and to prevent frequent antenna switching (see, for example, Patent Document 1).
- broadcast receiving apparatus that has a plurality of demodulation units and is capable of simultaneously performing image reception (video display) and reception determination processing, and realizing continuous reception by switching the receiving broadcast station.
- the conventional broadcast receiving apparatus to receive the digital broadcast, if the received digital broadcast signal can be decoded, the information according to the purpose is decoded and the video, audio, and data are presented to the user.
- the digital broadcast signal is not decoded, it is possible to determine whether or not reception is possible only by obtaining the signal strength. In other words, if the signal strength is weak, decoding for presenting video and audio to the user cannot be processed sufficiently, so that it can be determined that reception is impossible.
- information that identifies a broadcasting station is transmitted in a layer that is easy to receive. Conversely, since a large amount of information is required for video and audio, it is transmitted in a hierarchy that can be obtained in a stable reception situation as compared with the information for identifying the broadcast station described above.
- the conventional broadcast receiving apparatus has a plurality of demodulation units (tuners), one of the two tuners displays video and the other tuner performs reception determination.
- demodulation units such as a tuner
- the demodulator displays video and the other tuner performs reception determination.
- a specific division algorithm of the demodulator in the case of having two or more tuners is not considered.
- the present invention has been made to solve the above-described problem, and has a high function by simultaneously performing a plurality of processes using a plurality of demodulated signals with a simple algorithm.
- An object of the present invention is to provide an inexpensive digital broadcast reception processing apparatus.
- a digital broadcast reception processing apparatus of the present invention includes a plurality of antennas that receive a plurality of digital broadcast signals, a plurality of demodulation units that demodulate the received digital broadcast signals and output a plurality of demodulated signals, A demodulating and sorting unit for sorting and outputting the demodulated signal into a first processing unit and a second processing unit, and carrier-combining and outputting the demodulated signal sorted by the first processing unit output from the demodulating and sorting unit Carrier synthesizing unit, main processing unit for processing the carrier-synthesized demodulated signal, sub-processing unit for processing the demodulated signal selected for the second processing unit, and demodulation for selecting the first processing unit and the second processing unit A sub-processing demodulation selection unit that determines a signal and instructs the demodulation allocating unit, and the sub-processing demodulation selection unit acquires signal strengths of a plurality of demodulated signals, and the acquired plurality of signal strengths The lowest signal strength and Specifying a high signal strength
- a highly functional and inexpensive digital broadcast reception processing apparatus is realized by simultaneously performing a plurality of processes using a plurality of demodulated signals with a simple algorithm. be able to.
- FIG. 1 is a block diagram showing a configuration of a digital broadcast reception processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a concept of the selection output of the demodulated signal according to the embodiment of the present invention.
- FIG. 3 is a diagram showing a concept that avoids a signal having the lowest signal strength according to an embodiment of the present invention.
- FIG. 4 is a flowchart showing an example of the operation of the digital broadcast reception processing apparatus according to the embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration example of a digital broadcast reception processing apparatus according to an embodiment of the present invention.
- the digital broadcast reception processing apparatus 100 includes a first antenna 101, a first demodulator 102, a second antenna 103, a second demodulator 104, a third antenna 105, and a third demodulator.
- the digital broadcast signal received from the first antenna 101 is demodulated by determining that it is a digital broadcast signal in the first demodulator 102, and is output to the demodulator / distributor 109 as a demodulated signal. Thereafter, the same processing is executed for the second antenna 103 and the second demodulator 104, the third antenna 105 and the third demodulator 106, and the fourth antenna 107 and the fourth demodulator 108.
- Demodulation allocating section 109 selects and outputs a plurality of demodulated demodulated signals into a first processing unit and a second processing unit.
- the first processing unit refers to a signal to be main-processed
- the second processing unit refers to a signal to be sub-processed.
- One of the four demodulated signals is input to the distribution sub-processing unit 112 in the second processing unit, and the other three are input to the distribution carrier combining unit 110 in the first processing unit.
- the carrier synthesizing unit 110 receives the three demodulated signals input from the demodulation allocating unit 109, synthesizes the carrier, and outputs the carrier synthesized signal to the main processing unit 111.
- the carrier synthesis method is a part that does not depend on the present invention, and therefore will not be described.
- the main processing unit 111 processes the carrier combined signal output from the carrier combining unit 110. For example, the main processing unit 111 decodes video and audio so that the television can be viewed, and displays information to the user by analyzing data broadcasting and program guide data. enable.
- the sub-processing unit 112 processes the demodulated signal output from the demodulation allocating unit 109. For example, the sub-processing unit 112 processes the one-segment service and outputs video on a small screen, or confirms the broadcasting status of another channel, and has a higher signal strength than the signal that the main processing unit 111 is processing. It can be used for various purposes such as searching for a relay station that is likely to be obtained and playing a role of assisting continuous viewing.
- the sub-processing demodulation selection unit 113 obtains information on the signal strength of each of the four demodulation units from the demodulation allocating unit 109 and determines to input the demodulated signal from the appropriate demodulation unit to the sub-processing unit 112. Instructs the demodulation and distribution unit 109. Then, the determined distribution state is maintained until the processing of the sub processing unit 112 is completed.
- the main processing unit 111 determines whether or not sub processing is necessary every elapse of a predetermined time, and sends a sub processing start notification and a sub processing end notification to the sub processing unit 112 and the sub processing demodulation selection unit 113. Do.
- the sub-processing start notification and the sub-processing end notification may be led by the sub-processing unit 112 or the sub-processing demodulation selection unit 113 instead of being led by the main processing unit 111.
- the sub-processing demodulation selection unit 113 determines whether or not sub-processing is necessary based on the signal strength of each demodulation unit, and performs a sub-processing start notification and sub-processing end notification to the sub-processing unit 112. You may do it.
- the demodulator allocating unit 109 outputs three demodulated signals in the first processing unit and one demodulated signal in the second processing unit
- the number of antennas and demodulating units is described. It may be changed depending on For example, two demodulated signals may be output in the first processing unit, one demodulated signal in the second processing unit, or two demodulated signals in the first processing unit. Alternatively, two demodulated signals may be output.
- FIG. 2 the antenna (first antenna 101, second antenna 103, third antenna 105, and fourth antenna 107) of FIG. 1 and a demodulator (first demodulator 102, second demodulator) are shown.
- Unit 104, third demodulator 106, and fourth demodulator 108), demodulation distribution unit 109, and sub-processing demodulation selection unit 113 will be specifically described.
- the sub-processing demodulation selection unit 113 includes the first demodulation unit 102.
- Each information of the fourth signal strength 208 obtained by the demodulator 108 is obtained from the demodulator allocator 109.
- the first signal strength 202 is 70
- the second signal strength 204 is 75
- the third signal strength 206 is 72
- the fourth signal strength 208 is 72.
- the sub-processing demodulation selection unit 113 has the first signal strength 202 among the first signal strength 202, the second signal strength 204, the third signal strength 206, and the fourth signal strength 208. Since it is the lowest value, it is determined to output the demodulated signal from the first demodulator 102 to the second processing unit.
- the sub-processing demodulation selection unit 113 does not output the demodulated signal with the lowest signal strength to the second processing unit, but the demodulated signal with the highest signal strength (the demodulated signal from the second demodulating unit 104 in FIG. 2). Signal) may be determined to be output to the second processing unit. Further, the sub-processing demodulation selection unit 113 may acquire a signal strength at a predetermined time interval and select a demodulated signal having the lowest signal strength or a demodulated signal having the highest signal strength as the second processing unit. Good. Further, the sub-processing demodulation selection unit 113 may select a demodulated signal having a signal strength other than the above as the second processing unit.
- FIG. 3 is a diagram illustrating a concept in which the digital broadcast reception processing apparatus according to the present embodiment avoids outputting a demodulated signal having the lowest signal strength to the second processing unit.
- the antenna of FIG. 1 first antenna 101, second antenna 103, third antenna 105, and fourth antenna 107) and demodulator (first demodulator 102, second demodulator).
- Unit 104, third demodulator 106, and fourth demodulator 108), demodulation distribution unit 109, and sub-processing demodulation selection unit 113 will be described specifically.
- the sub-processing demodulation selection unit 113 includes the first demodulation unit 102.
- Each information of the fourth signal strength 308 obtained by the demodulator 108 is obtained from the demodulator allocator 109.
- the sub-processing demodulation selection unit 113 includes the fourth signal strength 308 among the first signal strength 302, the second signal strength 304, the third signal strength 306, and the fourth signal strength 308. Is the lowest value, but is less than 50% of the second signal strength 304 having the highest signal strength, so that there is a possibility of failure or disconnection, and the fourth demodulator 108 obtained the fourth signal strength 308. Is likely to be unable to withstand sub-processing.
- the sub-processing demodulation selection unit 113 determines to output the demodulated signal from the first demodulation unit 102 that has obtained the first signal strength 302 having the next lowest signal strength to the second processing unit. That is, the sub-processing demodulation selection unit 113 compares the lowest signal strength with the highest signal strength when a plurality of signal strengths are acquired, and the difference between the lowest signal strength and the highest signal strength is within a predetermined range. It is determined whether or not to output a demodulated signal having the lowest signal strength to the second processing unit according to whether or not it exceeds.
- the sub-processing demodulation selection unit 113 determines the demodulated signal having the lowest signal strength as the second processing unit according to whether or not the lowest signal strength is 50% or less of the highest signal strength.
- the range for determining the signal strength may be appropriately determined according to the situation in which the digital broadcast reception processing apparatus 100 is used. In the above-described example, when it is determined that the demodulated signal having the lowest signal strength is not suitable as the second processing unit, the demodulated signal having the second lowest signal strength is output to the second processing unit.
- the demodulated signal having the second highest signal strength that is, the demodulated signal from the third demodulator 106 or the demodulated signal having the highest signal strength (that is, the demodulated signal from the first demodulator 102) is used. You may decide to output to a 2nd process unit.
- the sub-processing demodulation selection unit 113 specifies the lowest signal strength and the highest signal strength when acquiring the signal strengths of a plurality of demodulated signals, and the difference between the lowest signal strength and the highest signal strength.
- a demodulated signal other than the demodulated signal having the lowest signal strength is output as the second processing unit.
- the sub-processing demodulation selection unit 113 determines the demodulated signal having the lowest signal strength (as described above, the lowest signal strength).
- a demodulated signal other than a strong demodulated signal may be output as the second processing unit.
- the sub-processing demodulation selection unit 113 preferably outputs a demodulated signal having the highest signal strength to the first processing unit. This is because the demodulated signal having the highest signal strength can stably provide video and audio to the user and is considered to be used for main processing.
- FIG. 4 is a flowchart showing an example of the operation of the digital broadcast reception processing apparatus.
- a plurality of demodulation units 102, 104, 106, and 108 receive digital broadcast signals via a plurality of antennas 101, 103, 105, and 107 (step S11).
- the plurality of demodulation units 102, 104, 106, and 108 demodulate the received digital broadcast signals and output a plurality of demodulated signals (step S12).
- the sub-processing demodulation selection unit 113 determines a demodulated signal to be sorted into the first processing unit and the second processing unit (step S13).
- the sub-processing demodulation selection unit 113 acquires the signal strengths of the plurality of demodulated signals, identifies the lowest signal strength and the highest signal strength among the acquired signal strengths, When a difference between the lowest signal strength and the highest signal strength exceeds a predetermined range, a demodulated signal other than the demodulated signal having the lowest signal strength is selected as the second processing unit.
- the demodulation allocating unit 109 selects and outputs a plurality of demodulated signals into the first processing unit and the second processing unit according to the determination by the sub-processing demodulation selection unit 113 (step S14).
- the carrier synthesizing unit 110 performs carrier synthesis on the demodulated signal selected for the first processing unit, and outputs the carrier synthesized signal (step S15).
- the main processing unit 111 processes the carrier combined signal output from the carrier combining unit 110 (step S16).
- the sub processing unit 112 processes the demodulated signal selected in the second processing unit (step S17).
- each processing procedure performed by the digital broadcast reception processing device described above is interpreted and executed by the CPU with predetermined program data stored in a storage device (ROM, RAM, hard disk, etc.) capable of executing the processing procedure described above. It may be realized by doing.
- the program data may be introduced into the storage device via the storage medium, or may be directly executed from the storage medium.
- the storage medium refers to a semiconductor memory such as a ROM, a RAM, and a flash memory, a magnetic disk memory such as a flexible disk and a hard disk, an optical disk memory such as a CD-ROM, a DVD, and a BD, and a memory card.
- the storage medium is a concept including a communication medium such as a telephone line or a conveyance path.
- the present invention is useful for a diversity broadcast reception digital broadcast reception processing apparatus for mobile reception.
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Abstract
Description
101 第1のアンテナ
102 第1の復調部
103 第2のアンテナ
104 第2の復調部
105 第3のアンテナ
106 第3の復調部
107 第4のアンテナ
108 第4の復調部
109 復調振分部
110 キャリア合成部
111 主処理部
112 副処理部
113 副処理用復調選択部
Claims (7)
- 複数のデジタル放送信号を受信する複数のアンテナと、
受信された前記複数のデジタル放送信号を復調して、複数の復調信号を出力する複数の復調部と、
前記複数の復調信号を第1処理単位と第2処理単位とに選別して出力する復調振分部と、
前記第1処理単位に選別された復調信号をキャリア合成して出力するキャリア合成部と、
前記キャリア合成された復調信号を処理する主処理部と、
前記第2処理単位に選別された復調信号を処理する副処理部と、
前記第1処理単位及び前記第2処理単位に選別する復調信号を決定し、前記復調振分部に指示する副処理用復調選択部とを具備し、
前記副処理用復調選択部は、前記複数の復調信号の信号強度を取得し、当該取得した複数の信号強度の中で、最も低い信号強度と最も高い信号強度とを特定し、前記最も低い信号強度と前記最も高い信号強度との差異が所定範囲を超えた場合に、前記最も低い信号強度の復調信号以外の復調信号を前記第2処理単位に選別することを決定する、デジタル放送受信処理装置。 - 前記副処理用復調選択部は、所定時間間隔で前記複数の復調信号の信号強度を取得する、請求項1に記載のデジタル放送受信処理装置。
- 前記副処理用復調選択部は、前記最も低い信号強度と前記最も高い信号強度との差異が所定範囲を超えなかった場合は、前記最も低い信号強度の復調信号を前記第2処理単位に選別することを決定する、請求項1に記載のデジタル放送受信処理装置。
- 前記副処理用復調選択部は、前記複数の復調信号のうち、少なくとも前記最も高い信号強度の復調信号を前記第1処理単位に選別することを決定する、請求項1に記載のデジタル放送受信処理装置。
- 前記副処理用復調選択部は、前記最も低い信号強度と前記最も高い信号強度との差異が所定範囲を超えた場合に、前記最も低い信号強度の次に低い信号強度の復調信号を前記第2処理単位に選別することを決定する、請求項1に記載のデジタル放送受信処理装置。
- 前記副処理用復調選択部は、前記最も低い信号強度と前記最も高い信号強度との差異が所定範囲を超えた場合に、前記最も高い信号強度の次に高い信号強度の復調信号を第2処理単位に選別することを決定する、請求項1に記載のデジタル放送受信処理装置。
- 複数のアンテナからを備えたデジタル放送受信処理装置が実施する方法であって、
前記複数のアンテナから複数のデジタル放送信号を受信するステップと、
前記複数のデジタル放送信号を復調して、複数の復調信号を出力する復調ステップと、
第1処理単位及び第2処理単位に選別する復調信号を決定する副処理用復調選択ステップと、
前記複数の復調信号を前記第1処理単位と前記第2処理単位とに選別して出力する復調振分ステップと、
前記第1処理単位に選別された復調信号をキャリア合成して出力するキャリア合成ステップと、
前記キャリア合成された復調信号を処理する主処理ステップと、
前記第2処理単位に選別された復調信号を処理する副処理ステップとを具備し、
前記副処理用復調選択ステップは、前記複数の復調信号の信号強度を取得し、当該取得した複数の信号強度の中で、最も低い信号強度と最も高い信号強度とを特定し、前記最も低い信号強度と前記最も高い信号強度との差異が所定範囲を超えた場合に、前記最も低い信号強度の復調信号以外の復調信号を前記第2処理単位に選別することを決定する、方法。
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JP2012506848A JP5271449B2 (ja) | 2010-03-23 | 2011-03-23 | デジタル放送受信処理装置 |
US13/583,641 US20130003898A1 (en) | 2010-03-23 | 2011-03-23 | Digital Broadcast Reception Processing Apparatus |
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Citations (3)
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JPH1188245A (ja) * | 1997-09-02 | 1999-03-30 | Fujitsu Ten Ltd | 車載用テレビ受像機の受信方式 |
JP2005159615A (ja) * | 2003-11-25 | 2005-06-16 | Sharp Corp | 受信装置 |
JP2006270378A (ja) * | 2005-03-23 | 2006-10-05 | Xanavi Informatics Corp | 車載テレビ表示装置 |
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JP4405375B2 (ja) * | 2004-12-07 | 2010-01-27 | 三菱電機株式会社 | ディジタル放送受信装置 |
JP2006319709A (ja) * | 2005-05-13 | 2006-11-24 | Fujitsu Ltd | 副信号変調装置,副信号復調装置および副信号変復調システム |
JP2007158515A (ja) * | 2005-12-01 | 2007-06-21 | Matsushita Electric Ind Co Ltd | ダイバーシティ受信装置 |
JPWO2008026376A1 (ja) * | 2006-09-01 | 2010-01-14 | シャープ株式会社 | 復調装置、復調装置の制御方法、復調装置の制御プログラム、および復調装置の制御プログラムを記録した記録媒体 |
JP4658201B2 (ja) * | 2006-10-17 | 2011-03-23 | パイオニア株式会社 | ダイバシティ受信装置及びダイバシティ受信方法 |
JP2008286753A (ja) * | 2007-05-21 | 2008-11-27 | Panasonic Corp | 測位装置及びその制御方法 |
JP2009060178A (ja) * | 2007-08-29 | 2009-03-19 | Sharp Corp | ダイバーシティ装置 |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1188245A (ja) * | 1997-09-02 | 1999-03-30 | Fujitsu Ten Ltd | 車載用テレビ受像機の受信方式 |
JP2005159615A (ja) * | 2003-11-25 | 2005-06-16 | Sharp Corp | 受信装置 |
JP2006270378A (ja) * | 2005-03-23 | 2006-10-05 | Xanavi Informatics Corp | 車載テレビ表示装置 |
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