WO2010097866A1 - 受信装置 - Google Patents
受信装置 Download PDFInfo
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- WO2010097866A1 WO2010097866A1 PCT/JP2009/005878 JP2009005878W WO2010097866A1 WO 2010097866 A1 WO2010097866 A1 WO 2010097866A1 JP 2009005878 W JP2009005878 W JP 2009005878W WO 2010097866 A1 WO2010097866 A1 WO 2010097866A1
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- WIPO (PCT)
- Prior art keywords
- broadcast wave
- receiving apparatus
- wave arrangement
- broadcast
- filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2334—Demodulator circuits; Receiver circuits using non-coherent demodulation using filters
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
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- 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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates to a receiver capable of multi-channel reception that receives a plurality of broadcast waves simultaneously.
- the frequency conversion circuit that distributes one antenna input and converts it to an intermediate frequency for each broadcast wave that it wants to receive, and a band limiting filter, and outputs one or more tuner outputs to each perform signal demodulation.
- a multi-channel receiving apparatus for example, see Patent Document 1 that reduces the number of components such as an antenna by performing the process.
- each of the extracted broadcast waves desired to be received is synthesized again, and a plurality of channels are output via one output terminal.
- a multi-channel receiver see Patent Document 2 that can reduce the hardware of the signal demodulator.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a receiving apparatus that enables multi-channel reception and can realize further downsizing and cost reduction.
- a receiving apparatus includes a first frequency conversion circuit that converts a received signal including two or more broadcast waves into a first intermediate frequency signal, and the first intermediate frequency signal. It is limited to a band separation filter composed of a multi-stage FIR filter that allows bands included in two or more converted broadcast waves to pass simultaneously, and two or more broadcast waves to be received output from the band separation filter. And a second frequency conversion circuit that converts the received signal into a second intermediate frequency signal that can be sampled at a frequency at which each broadcast wave does not interfere.
- FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.
- the receiving apparatus 1 according to Embodiment 1 of the present invention includes an antenna 11, a band limiting filter (BPF) 12, a first frequency conversion circuit 13, a band separation filter 14, The second frequency conversion circuit 15 and an OFDM (Orthogonal Frequency Division Multiplex) demodulator 16 are included.
- BPF band limiting filter
- the second frequency conversion circuit 15 and an OFDM (Orthogonal Frequency Division Multiplex) demodulator 16 are included.
- the LSI structure of the receiving system except for the antenna 11 is shown, and the structure of the reproducing system LSI such as a decoding circuit and a DA converter circuit connected after the OFDM demodulator 16 is not shown.
- the received signal input via the antenna 11 is limited to the entire broadcast wave band (for example, UHF band: Ultra High Frequency) by the BPF 12.
- the reception signal limited here is mixed with a local frequency generated by a voltage controlled oscillator (Voltage Controlled Oscillator) # 1 constituting the first frequency conversion circuit 13 and converted into a first intermediate frequency.
- the received radio wave converted to the first intermediate frequency by the first frequency conversion circuit 13 is input to the band separation filter 14.
- the band separation filter 14 includes an FIR (Finite Impulse Response) type transformer composed of delay circuits 141 1 to n , coefficient multipliers 142 1 to n, and an adder 143. Consists of a Versal filter. As is well known, the delay circuits 141 1 to n delay the received signals by a predetermined time, and the coefficient multipliers 142 1 to n multiply the input / output of each delay circuit 141 1 to n by each predetermined coefficient. The adder 143 takes the sum of the outputs of the coefficient multipliers 142 1 to n .
- FIR Finite Impulse Response
- the delay time by the delay circuits 141 1 to n determines the folding characteristics of the FIR type transversal filter that constitutes the band separation filter 14. That is, the filter characteristics are repeated at a frequency interval that is the reciprocal of the minimum time of the delay circuits 141 1 to n .
- the bandwidth control is performed using this aliasing characteristic.
- the range indicated by the symbol A indicates the entire channel band
- the range indicated by the symbol B indicates the repetitive band
- the received radio wave limited to only a plurality of broadcast waves to be received by the band separation filter 14 is appropriately sampled so that the plurality of broadcast waves do not interfere with the VCO # 2 constituting the second frequency conversion circuit 15.
- the signal is converted into an intermediate frequency signal that can be sampled at a frequency and output to the OFDM demodulator 16.
- the OFDM demodulator 16 frequency-converts the frequency band of all broadcast wave bands to be received by the same FFT (Fast Fourier Transform) unit, and then decomposes them into individual broadcast waves to obtain MPEG2-TS (Moving (Picture Element ⁇ Group 2-Transport Stream) and output to a reproduction LSI including a decoding circuit (not shown).
- FFT Fast Fourier Transform
- FIG. 4A and 4B are diagrams showing the frequency conversion of the receiving apparatus 1 according to Embodiment 1 of the present invention.
- FIG. 4A shows the BPF 12 output
- FIG. 4B shows the first frequency conversion circuit 13.
- FIG. 4C shows the output of the band separation filter 14
- FIG. 4D shows the output of the second frequency conversion circuit 15
- FIG. 4E shows the output of the A / D converter in the previous stage constituting the OFDM demodulator 16. is there.
- the received signal input to the antenna 11 is supplied to the BPF 12, and is limited to broadcast waves in the all-band broadcast wave band by the BPF 12.
- FIG. 4A it is assumed that seven broadcast waves a to g are extracted.
- the first frequency conversion circuit 13 sets the local transmission frequency fx by VCO1 # when the broadcast wave with the highest frequency among the broadcast waves to be received is f1, the broadcast wave with the lowest frequency is f2, and the offset frequency fy.
- VCO1 # the broadcast wave with the highest frequency among the broadcast waves to be received
- f2 the broadcast wave with the lowest frequency
- fy the offset frequency
- the received radio wave converted to the first intermediate frequency by the first frequency conversion circuit 13 is input to the band separation filter 14, and the band separation filter 14 desires multi-channel reception as shown in FIG. 4B.
- the band is limited so that two broadcast waves a and f pass simultaneously and the passage of other broadcast waves is blocked, the frequency characteristics change as shown in FIG.
- the reception signal band-limited to two broadcast waves by the band separation filter 14 is supplied to the second frequency conversion circuit 15, and further frequency conversion is performed by the second frequency conversion circuit 15, as shown in FIG. Get the frequency characteristics shown. Then, when sampling is performed by the A / D converter of the input stage constituting the OFDM demodulator 16, the frequency characteristics shown in FIG.
- the OFDM demodulator 16 separates the two broadcast waves desired to be received from the multi-channel from here, but suppose that the two broadcast waves are extracted from the lower frequency, and at this time, FIG. As in e), it is necessary to select the local oscillation frequency by the VCO # 2 of the second frequency conversion circuit 15 so that the folded waves do not overlap after the A / D converter and the sampling frequency can be lowered. .
- the receiving apparatus 1 includes the first frequency conversion circuit 13 that converts a reception signal including two or more broadcast waves into a first intermediate frequency signal by local transmission.
- the band separation filter 14 composed of a multi-stage FIR filter that simultaneously passes the bands included in the two or more broadcast waves converted into the first intermediate frequency signal, and 2 received by the band separation filter 14
- a second frequency conversion circuit 15 that converts the received signal into a second intermediate frequency signal that can be sampled at a frequency at which each broadcast wave does not interfere
- the band separation filter 14 is an FIR filter including a multistage delay circuit 141 1-n , coefficient multipliers 142 1-n, and an adder 143.
- a multistage delay circuit 141 1-n the delay circuits 141 1 to n , the coefficient multipliers 142 1 to n, and the adder 143 constituting the band separation filter 14 are easy to implement as an LSI because they can be easily realized by analog circuits.
- a receiving device can be provided.
- an n-branch diversity receiver shown in FIG. 5 may be configured by combining two or more radio waves to be received or switching to take measures against fading by using a plurality of the above configurations.
- the n-branch diversity receiver described above includes a receiving apparatus 1A including an antenna 11A, a BPF 12A, a first frequency conversion circuit 13A, a band separation filter 14A, a second frequency conversion circuit 15A, and an OFDM demodulator 16A, and an antenna 11B.
- BPF 12B, first frequency conversion circuit 13B, band separation filter 14B, second frequency conversion circuit 15B, and reception apparatus 1B composed of OFDM demodulator 16B, including two receivers, and output of OFDM demodulator 16B Is received by the OFDM demodulator 16A and combined or switched to perform the above-described diversity reception.
- the receiving system composed of the first frequency conversion circuit 13, the band separation filter 14, and the second frequency conversion circuit 15 is represented by n (n is an arbitrary positive integer).
- FIG. 6 and 7 are block diagrams showing the configuration of the band separation filter 14 used in the receiving apparatus 1 according to Embodiment 2 of the present invention.
- the coefficient generation unit of the FIR filter shown as the first embodiment in FIG. 2 is extracted and shown.
- the delay circuits 141 1 to n and a part of the coefficient multipliers 142 1 to n have the same configuration as that in FIG.
- the coefficient generation unit of the FIR filter that constitutes the band separation filter 14 calculates a coefficient by calculation in the coefficient calculation circuit 144, or is shown in FIG. 6B.
- the coefficient table 145 in which several combinations of coefficients are stored in advance and the coefficient table selection control circuit 146 that selects the combination of coefficients stored in the coefficient table 145 are configured.
- the coefficients of the coefficient multipliers 142 1 to n constituting the FIR filter are referred to the coefficient table 145 in which some combinations of coefficients are stored in advance.
- the optimum coefficient value can be selected by setting the value selected by the calculation of the coefficient calculation circuit 144. Since the coefficient calculation circuit 144 is not required by the table selection, the circuit scale can be reduced.
- an output according to the characteristics of the selected filter is added to the output of the FIR filter by adding an output gain circuit 147 that controls the level by adjusting the gain according to the combination of coefficients. It is possible to compensate for the deterioration of the gain based on the level increase / decrease.
- the adder 143 and the output gain circuit 147 may be configured with passive elements.
- FIG. FIG. 8 is a block diagram showing the configuration of the band separation filter 14 used in the receiving apparatus 1 according to Embodiment 3 of the present invention.
- the broadcast wave arrangement detection circuit 148 and the table data update control unit 149 are added to the configuration of the second embodiment shown in FIG. 6B.
- the broadcast wave arrangement detection circuit 148 detects the broadcast wave arrangement, and the table data update control unit 149 calculates a filter characteristic according to the broadcast wave arrangement detected by the broadcast wave arrangement detection circuit 148 to obtain a new FIR filter coefficient. And the table data stored in the coefficient table 145 is updated.
- Broadcast wave arrangement detection circuit 148 adopts a method of performing a normal channel scan and updating it by comparing with the currently stored broadcast wave arrangement. Specifically, as shown in FIG. 9, the broadcast wave arrangement detection circuit 148 includes a scan control unit 1481 and a channel memory 1482, and the broadcast wave arrangement is updated according to the procedure shown in FIG.
- the scan control unit 1481 controls the VCO # 1 and VCO # 2 included in the frequency conversion circuits 13 and 15, the band separation filter 14, and the OFDM demodulator 16 to connect to the subsequent stage of the OFDM demodulator 16.
- the channel is appropriately changed while acquiring channel information such as broadcast wave ID via the MPEG decoder 17 (step ST101), and the presence / absence of receivable stations is scanned over the entire broadcast band.
- step ST102 determines that there is a receivable station.
- the channel information is updated (step ST103), and the broadcast does not match the broadcast wave arrangement information currently stored in the channel memory 1482.
- step ST104 broadcast wave arrangement change information is notified to the table data update control unit 149 (step ST105).
- step ST106 The above operation is repeatedly executed over the entire broadcast band (step ST106). If “NO” in steps ST102 and 104, the process proceeds to step ST106.
- the change information may be broadcast on the broadcast wave.
- the change information is obtained from the MPEG decoder 17 and is compared with the channel arrangement currently stored in the channel memory 1482 and updated.
- the channel arrangement information acquired by the user from the Internet or the like may be recorded in the removable memory 200 or the like and updated by connecting the removable memory 200.
- the broadcast wave arrangement detection circuit 148 that detects and sequentially updates the broadcast wave arrangement, and the coefficient table according to the broadcast wave arrangement detected by the broadcast wave arrangement detection circuit 148.
- FIG. FIG. 11 is a block diagram showing a configuration of band separation filter 14 used in receiving apparatus 1 according to Embodiment 4 of the present invention.
- a plurality of FIR filters shown in FIG. 2 having different coefficients as the first embodiment are provided, and the switch circuit 150 selects them.
- the delay circuits 141 1 to n constituting the FIR type filter are shown to be commonly used for circuit reduction, as shown in FIG. Of course, the delay circuits 141 1 to n may be individually provided.
- the filter operation by selecting the optimum coefficient is facilitated.
- the circuit scale can be increased as compared with the case where the delay circuits 141 1 to n are individually provided. Reduction is possible.
- FIG. FIG. 12 is a block diagram showing a configuration of band separation filter 14 used in receiving apparatus 1 according to Embodiment 5 of the present invention.
- a plurality of band separation filters 14 shown in the first embodiment of FIG. 1 having different pass bands are connected in series 14 1 to 14 n .
- band limitation is performed by connecting two or more FIR type filters that select combinations of coefficients having different passbands in series.
- the operation is conceptually shown in FIG. 5, since the passage of CH2 is blocked and the characteristics of the filter can be further limited, the degree of freedom of the selected band is increased, and more desirable band limitation can be performed.
- the receiving apparatus enables multi-channel reception with a small number of parts, and can achieve further downsizing and cost reduction. Therefore, the receiving apparatus is used for a receiving apparatus capable of receiving multiple broadcast waves simultaneously and capable of receiving multi-channels. Suitable for
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Abstract
Description
実施の形態1.
図1は、この発明の実施の形態1に係る受信装置の構成を示すブロック図である。図1に示されるように、この発明の実施の形態1に係る受信装置1は、アンテナ11と、帯域制限フィルタ(BPF)12と、第1の周波数変換回路13と、帯域分離フィルタ14と、第2の周波数変換回路15と、OFDM(Orthogonal Frequency Division Multiplex:直交周波数分割多重)復調器16とにより構成される。
ここで制限された受信信号は、第1の周波数変換回路13を構成する電圧制御発信器VCO(Voltage Controlled Oscillator)#1が生成するローカル周波数とミキシングされ第1の中間周波数に変換される。次に、第1の周波数変換回路13により第1の中間周波数に変換された受信電波は帯域分離フィルタに14に入力される。
周知のように、遅延回路1411~nは、受信信号を所定の時間だけ遅延し、係数乗算器1421~nは、各遅延回路1411~nの入出力を各所定の係数で乗算し、加算器143は、各係数乗算器1421~nの出力の和をとる。
図6、図7は、この発明の実施の形態2に係る受信装置1で使用される帯域分離フィルタ14の構成を示すブロック図である。ここでは、図2に実施の形態1として示したFIR型フィルタの係数生成部のみを抽出して示してある。
なお、図6、図7において、遅延回路1411~nと、係数乗算器1421~nの一部は、図2と同じ構成になるためここでは図示省略してある。
また、上記した構成のうち、加算器143と出力ゲイン回路147は、受動素子で構成しても良い。
図8は、この発明の実施の形態3に係る受信装置1で使用される帯域分離フィルタ14の構成を示すブロック図である。
ここでは、図6(b)に示した実施の形態2が有する構成に、放送波配置検出回路148と、テーブルデータ更新制御部149とを付加する構成とした。
図11は、この発明の実施の形態4に係る受信装置1で使用される帯域分離フィルタ14の構成を示すブロック図である。
図12は、この発明の実施の形態5に係る受信装置1で使用される帯域分離フィルタ14の構成を示すブロック図である。ここでは、通過帯域がそれぞれ異なる図1の実施の形態1で示した帯域分離フィルタ14を、複数個141~14n直列に接続する構成としている。
Claims (11)
- 2以上の放送波を含む受信信号を第1の中間周波数信号に変換する第1の周波数変換回路と、
前記第1の中間周波数信号に変換された2以上の放送波に含まれる帯域を同時に通過させる多段のFIR型フィルタで構成された帯域分離フィルタと、
前記帯域分離フィルタにより出力される前記受信したい2以上の放送波に制限された受信信号を、各放送波が干渉しない周波数でサンプリング可能な第2の中間周波数信号に変換する第2の周波数変換回路と、
を備えたことを特徴とする受信装置。 - 前記FIR型フィルタを構成する遅延回路による遅延時間を、
前記受信信号の最下限チャンネルから最上限チャンネルの差で示される全チャンネル帯域の1/2n(nは任意の整数)の周波数の逆数とすることを特徴とする請求項1記載の受信装置。 - 前記FIR型フィルタを構成する係数乗算器の係数を、
予め幾つかの係数の組合せが記憶される係数テーブルを参照し、もしくは演算により選択された値とすることを特徴とする請求項1項記載の受信装置。 - 前記選択された係数の組合せに応じて出力ゲインを調整し、レベル制御を行う出力ゲイン回路と、
を備えたことを特徴とする請求項3記載の受信装置。 - 前記出力ゲイン回路、または前記FIR型フィルタを構成する加算器、もしくは両方を受動素子で構成することを特徴とする請求項4記載の受信装置。
- 放送波配置を検出して逐次更新する放送波配置検出回路と、
前記放送波配置検出回路で検出された放送波配置に応じて前記係数テーブルの内容を更新するテーブルデータ更新制御部と、
を備えたことを特徴とする請求項3記載の受信装置。 - 前記放送波配置検出回路は、
チャンネルスキャンを実行し、現在記憶している放送波配置と比較して最新の放送波配置に更新することを特徴とする請求項6記載の受信装置。 - 前記放送波配置検出回路は、
放送波に重畳された変更情報を取得し、もしくは外部から取得した放送波配置情報に基づき、現在記憶している放送波配置と比較して最新の放送波配置に更新することを特徴とする請求項6記載の受信装置。 - 異なる係数を有する複数のFIR型フィルタを選択するスイッチ
を備えたことを特徴とする請求項3項記載の受信装置。 - 前記複数のFIR型フィルタを構成する遅延回路を各FIR型フィルタで共通に使用することを特徴とする請求項9記載の受信装置。
- 通過帯域が異なる係数の組合せを選択する2以上のFIRフィルタを直列に接続して通過帯域の制限を行うことを特徴とする請求項1記載の受信装置。
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JP2011501361A JP5264987B2 (ja) | 2009-02-25 | 2009-11-05 | 受信装置 |
DE112009004582.0T DE112009004582B4 (de) | 2009-02-25 | 2009-11-05 | Empfänger |
CN200980157673.5A CN102334297B (zh) | 2009-02-25 | 2009-11-05 | 接收装置 |
US13/139,812 US8494471B2 (en) | 2009-02-25 | 2009-11-05 | Receiver |
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JP2009-042617 | 2009-02-25 | ||
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JP (1) | JP5264987B2 (ja) |
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Cited By (1)
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JP2014187428A (ja) * | 2013-03-21 | 2014-10-02 | Fujitsu Ltd | 受信回路及び受信方法 |
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WO2014087694A1 (ja) * | 2012-12-07 | 2014-06-12 | 三菱電機株式会社 | ダイバーシチ受信装置及びダイバーシチ受信方法 |
CN109842770A (zh) * | 2017-11-28 | 2019-06-04 | 晨星半导体股份有限公司 | 信号接收装置及其信号处理方法 |
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- 2009-11-05 WO PCT/JP2009/005878 patent/WO2010097866A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JPWO2010097866A1 (ja) | 2012-08-30 |
CN102334297A (zh) | 2012-01-25 |
US20110244818A1 (en) | 2011-10-06 |
DE112009004582B4 (de) | 2017-01-26 |
DE112009004582T5 (de) | 2012-06-28 |
JP5264987B2 (ja) | 2013-08-14 |
CN102334297B (zh) | 2014-07-23 |
US8494471B2 (en) | 2013-07-23 |
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