【０００１】[0001]
【発明の属する技術分野】本発明は無線通信等に用いら
れるダイバーシティ受信機に関する。The present invention relates to a diversity receiver used for wireless communication and the like.
【０００２】[0002]
【従来の技術】一般に無線通信等に用いられるダイバー
シティ受信機は、受信部が受信した信号からフェージン
グによる影響を取り除く有効な手段を有している。その
一般的な手法には、複数の受信部からのベースバンド信
号を、各受信部での受信電界強度に応じて重みつけして
合成し、復号を行う最大比合成ダイバーシティ方式や、
複数の受信信号の中から最も受信電界強度が強いブラン
チを選択して復号を行う選択ダイバーシティ方式等があ
る。現在、選択ダイバーシティ方式に比べて、最大比合
成ダイバーシティ方式の方が性能的に優れていることが
知られている。2. Description of the Related Art Diversity receivers generally used for radio communications and the like have effective means for removing the effects of fading from signals received by a receiver. The general method includes a maximum ratio combining method of combining baseband signals from a plurality of receivers, weighting them according to the received electric field strength at each receiver, and decoding the signals,
For example, there is a selection diversity system in which a branch having the highest received electric field strength is selected from a plurality of received signals and decoding is performed. At present, it is known that the maximum ratio combining diversity system is superior in performance to the selection diversity system.
【０００３】図４に受信系が２系統の場合の、従来の合
成ダイバーシティ受信機の構成を示す。FIG. 4 shows a configuration of a conventional combined diversity receiver in the case where there are two receiving systems.
【０００４】図４において、１、２は飛来電磁波を受け
る第１、第２の受信ブランチのアンテナ、３、４は前記
アンテナ１、２で受信した信号をダウンコンバートし、
ベースバンド信号と受信電界強度（ＲＳＳＩ）を出力す
る受信部、５は、受信部３、４から受け取ったＲＳＳＩ
信号をもとにベースバンド信号に重み付けをして合成す
るダイバーシティ合成部、６はダイバーシティ合成部５
からの出力を受け、データを復調する復調部である。In FIG. 4, reference numerals 1 and 2 denote antennas of first and second receiving branches for receiving an incoming electromagnetic wave, and 3 and 4 downconvert signals received by the antennas 1 and 2,
The receiving unit 5 that outputs the baseband signal and the received field strength (RSSI) is the RSSI received from the receiving units 3 and 4.
A diversity synthesizing unit for weighting and synthesizing the baseband signal based on the signal;
And a demodulation unit for demodulating data by receiving the output from.
【０００５】上記の各構成部よりなる合成ダイバーシテ
ィ受信機におけるダイバーシティ合成は、ＲＳＳＩ値が
大きい受信ブランチの重みを大きくしてベースバンド信
号を合成する。このようにして、フェージングの影響を
軽減するダイバーシティ受信機を構成することができ
る。[0005] Diversity combining in a combining diversity receiver having the above-described components combines a baseband signal by increasing the weight of a receiving branch having a large RSSI value. In this way, a diversity receiver that reduces the effects of fading can be configured.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の合成ダイバーシティ受信機の構成では、受信時には
すべての受信ブランチが稼働しており、消費電力が大き
くなってしまう。However, in the configuration of the conventional combined diversity receiver described above, all reception branches are operating at the time of reception, so that power consumption increases.
【０００７】そこで、本発明は消費電力を低減できるダ
イバーシティ受信機を提供することを目的とする。Accordingly, an object of the present invention is to provide a diversity receiver capable of reducing power consumption.
【０００８】[0008]
【課題を解決するための手段】本発明は前記目的を達成
するために、電源制御部を設け、通信品質により稼働さ
せる受信ブランチ数を制御する手段を有するダイバーシ
ティ受信機の構成とする。In order to achieve the above object, the present invention provides a diversity receiver having a power supply control unit and means for controlling the number of receiving branches to be operated according to communication quality.
【０００９】この発明によれば、消費電力を低減するダ
イバーシティ受信機を提供することができる。According to the present invention, it is possible to provide a diversity receiver that reduces power consumption.
【００１０】[0010]
【発明の実施の形態】本発明の請求項１に記載の発明
は、複数のアンテナと、前記アンテナからの受信信号を
入力してベースバンド信号および受信電界強度信号を出
力する受信部と、前記ベースバンド信号と前記受信電界
強度信号をもとにダイバーシティ合成を行うダイバーシ
ティ合成部と、前記ダイバーシティ合成部から出力され
る信号を受け、データの復調を行う復調部と、電源制御
部を備え、受信電界強度に応じて受信する受信ブランチ
数を可変とし、使用しない受信ブランチの電源を切るよ
うにしたダイバーシティ受信機であり、使用しない受信
ブランチの電源を切ることにより、消費電力を低減でき
るという作用を有する。The invention according to claim 1 of the present invention comprises a plurality of antennas, a receiving unit that receives a signal received from the antenna and outputs a baseband signal and a received field strength signal, A diversity combining unit that performs diversity combining based on the baseband signal and the received electric field strength signal, a demodulation unit that receives a signal output from the diversity combining unit and demodulates data, and a power control unit. This is a diversity receiver that changes the number of receiving branches to be received according to the electric field strength and turns off the power of the unused receiving branches. Have.
【００１１】本発明の請求項２に記載の発明は、請求項
１記載のダイバーシティ受信機において、アンテナ数が
３本以上で、電源が投入されている受信ブランチが少な
くとも２系統以上ある場合は、前記電源が投入されてい
る受信ブランチで合成ダイバーシティ受信を行うように
したものであり、受信ブランチ数を減らしても合成ダイ
バーシティを行うことにより、通信品質を保つという作
用を有する。According to a second aspect of the present invention, in the diversity receiver according to the first aspect, when the number of antennas is three or more and at least two receiving branches are powered on, Combined diversity reception is performed in the receiving branch to which the power is turned on, and has an effect of maintaining communication quality by performing combined diversity even if the number of reception branches is reduced.
【００１２】本発明の請求項３に記載の発明は、請求項
１記載のダイバーシティ受信機において、受信電界強度
に加えて、位相誤差量も考慮して受信ブランチ数を変化
させるようにしたものであり、より的確に受信ブランチ
数を制御できるという作用を有する。According to a third aspect of the present invention, in the diversity receiver according to the first aspect, the number of reception branches is changed in consideration of a phase error amount in addition to a reception electric field strength. This has the effect that the number of reception branches can be controlled more accurately.
【００１３】本発明の請求項４に記載の発明は、複数の
アンテナと、前記アンテナからの受信信号を入力してベ
ースバンド信号および受信電界強度信号を出力する受信
部と、前記ベースバンド信号と前記受信電界強度信号を
もとにダイバーシティ合成を行うダイバーシティ合成部
と、前記ダイバーシティ合成部から出力される信号を受
け、データの復調を行う復調部と、電源制御部を備え、
最も受信電界強度が強い受信ブランチを選択して受信
し、使用しない受信ブランチの電源を切って合成の重み
を零とするダイバーシティ受信機であり、通信品質を保
持しつつ消費電力を削減するという作用を有する。[0013] According to a fourth aspect of the present invention, there is provided a radio communication apparatus comprising: a plurality of antennas; a receiving section that receives a signal received from the antenna and outputs a baseband signal and a received field strength signal; A diversity combining unit that performs diversity combining based on the received electric field strength signal, a demodulation unit that receives a signal output from the diversity combining unit and demodulates data, and a power control unit.
This is a diversity receiver that selects and receives the reception branch with the highest reception electric field strength, turns off the power of the unused reception branch, and sets the combining weight to zero, and reduces power consumption while maintaining communication quality. Having.
【００１４】本発明の請求項５に記載の発明は、請求項
４記載のダイバーシティ受信機において、アンテナ数が
３本以上で、電源を投入する受信ブランチを２系統以上
とした場合、前記電源を投入する受信ブランチは受信電
界強度が強いほうから選択して合成ダイバーシティを行
い、使用しない受信ブランチの電源を切って合成の重み
を零とするようにしたものであり、通信品質を保持しつ
つ消費電力を削減するという作用を有する。According to a fifth aspect of the present invention, in the diversity receiver according to the fourth aspect, when the number of antennas is three or more and the number of receiving branches for turning on the power is two or more, the power source is set to The receiving branch to be turned on is selected from the one with the stronger received electric field strength to perform combining diversity, and the power of the unused receiving branch is turned off to reduce the combining weight to zero, thereby consuming while maintaining the communication quality. It has the effect of reducing power.
【００１５】本発明の請求項６に記載の発明は、請求項
４記載のダイバーシティ受信機において、受信電界強度
に加えて、位相誤差量も考慮して受信ブランチ数を変化
させるようにしたものであり、より的確に受信ブランチ
数を制御できるという作用を有する。According to a sixth aspect of the present invention, in the diversity receiver according to the fourth aspect, the number of reception branches is changed in consideration of the phase error amount in addition to the reception electric field strength. This has the effect that the number of reception branches can be controlled more accurately.
【００１６】以下、本発明の実施の形態について図面を
用いて説明する。 （実施の形態１）本発明の実施の形態１のダイバーシテ
ィ受信機の構成を図１のブロック図に示す。なお、前記
従来例と同じ構成部には同一符号を付与している。Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) The configuration of a diversity receiver according to Embodiment 1 of the present invention is shown in the block diagram of FIG. The same components as those in the conventional example are denoted by the same reference numerals.
【００１７】図１において、１、２は飛来電磁波を受け
る第１、第２の受信ブランチのアンテナ、３、４はアン
テナ１、２で受信した信号をダウンコンバートし、ベー
スバンド信号と受信電界強度（ＲＳＳＩ）を出力する受
信部、５は、受信部３、４から受け取ったＲＳＳＩ信号
をもとにベースバンド信号に重み付けをして合成するダ
イバーシティ合成部、６はダイバーシティ合成部５から
の出力を受け、データを復調する復調部である。この実
施の形態１の特徴は、受信電界強度に応じて電源ＯＮ／
ＯＦＦの制御を行う電源制御部１１を備えたことにあ
る。In FIG. 1, reference numerals 1 and 2 denote antennas of first and second receiving branches for receiving an incoming electromagnetic wave, and reference numerals 3 and 4 deconvert signals received by the antennas 1 and 2, respectively. (RSSI) receiving section 5 is a diversity combining section that weights and combines baseband signals based on the RSSI signals received from receiving sections 3 and 4, and 6 is an output from diversity combining section 5. A demodulation unit that receives and demodulates data. The feature of the first embodiment is that the power supply is turned ON / OFF according to the received electric field strength.
The power supply control unit 11 that performs the OFF control is provided.
【００１８】また、受信電界強度ＲがＲｔ［ｄＢｍ］以
上であった場合はアンテナ数が１本でも十分通信品質が
保てるとし、このＲｔ［ｄＢｍ］をしきい値として受信
ブランチ数を切り替えることとする。If the received electric field strength R is equal to or more than Rt [dBm], it is assumed that the communication quality can be sufficiently maintained even with one antenna, and the number of reception branches is switched using this Rt [dBm] as a threshold value. I do.
【００１９】上記各構成部よりなるダイバーシティ受信
機において、第１受信ブランチの受信電界強度Ｒ１＜Ｒ
ｔのとき、電源制御部１１は電源をＯＮとするように制
御信号を出力し、第１、第２受信ブランチの合成ダイバ
ーシティ受信を行う。In the diversity receiver having the above components, the reception electric field strength of the first reception branch R1 <R
At time t, the power control unit 11 outputs a control signal to turn on the power, and performs combined diversity reception of the first and second reception branches.
【００２０】一方、Ｒ１＞Ｒｔのときは、電源制御部１
１は第２受信ブランチの電源をＯＦＦとするように制御
信号を出力し、ダイバーシティ合成部５では、第２受信
ブランチの合成ウェイトを零にして受信を行う。On the other hand, when R1> Rt, the power control unit 1
1 outputs a control signal to turn off the power of the second reception branch, and the diversity combining unit 5 performs reception by setting the combined weight of the second reception branch to zero.
【００２１】このようにして使用しない受信ブランチの
電源のＯＮ／ＯＦＦの切替を行い、消費電力を削減す
る。また、使用しない受信ブランチを受信電界強度の弱
い受信ブランチから選択すれば受信品質の向上を図るこ
とができる。In this manner, the power of the receiving branch not used is switched ON / OFF to reduce power consumption. In addition, the reception quality can be improved by selecting unused reception branches from reception branches having a weak reception electric field strength.
【００２２】（実施の形態２）本発明の実施の形態２の
ダイバーシティ受信機の構成を図２のブロック図に示
す。(Embodiment 2) The configuration of a diversity receiver according to Embodiment 2 of the present invention is shown in the block diagram of FIG.
【００２３】図中の１、２、２１、２２は飛来電磁波を
受ける第１〜４の受信ブランチのアンテナ、３、４、２
３、２４は各アンテナで受信した信号をダウンコンバー
トし、ベースバンド信号と受信電界強度（ＲＳＳＩ）を
出力する受信部、５は、受信部３、４、２３、２４から
受け取ったＲＳＳＩ信号をもとにベースバンド信号に重
み付けをして合成するダイバーシティ合成部、６はダイ
バーシティ合成部５からの出力を受け、データを復調す
る復調部である。この実施の形態２の特徴は、受信電界
強度に応じて電源ＯＮ／ＯＦＦの制御を行う電源制御部
２５を備えたことにある。In the figure, reference numerals 1, 2, 21, and 22 denote antennas of the first to fourth receiving branches for receiving incoming electromagnetic waves, 3, 4, 2, and 3, respectively.
The receiving units 3 and 24 down-convert the signals received by the antennas and output the baseband signal and the received signal strength (RSSI). The receiving unit 5 also receives the RSSI signals received from the receiving units 3, 4, 23 and 24. And a diversity combining unit 6 for weighting and combining the baseband signal and a demodulation unit 6 that receives the output from the diversity combining unit 5 and demodulates the data. The feature of the second embodiment resides in that a power supply control unit 25 for controlling power ON / OFF according to the received electric field strength is provided.
【００２４】また、受信電界強度ＲがＲｔ１［ｄＢｍ］
以上であった場合はアンテナ数が１本でも十分通信品質
が保てるとし、受信電界強度ＲがＲｔ２［ｄＢｍ］以上
であった場合はアンテナ数が２本で十分通信品質が保て
るとし、さらに受信電界強度ＲがＲｔ３［ｄＢｍ］以上
であった場合はアンテナ数が３本で十分通信品質が保て
るとする。これらＲｔ１、Ｒｔ２、Ｒｔ３［ｄＢｍ］を
しきい値として受信ブランチ数を切り替えることとす
る。Further, when the reception electric field strength R is Rt1 [dBm]
If this is the case, it is assumed that the communication quality can be sufficiently maintained even with one antenna, and if the received electric field strength R is equal to or more than Rt2 [dBm], it is assumed that the communication quality can be sufficiently maintained with two antennas. When the intensity R is equal to or more than Rt3 [dBm], it is assumed that the number of antennas is three and the communication quality can be sufficiently maintained. The number of reception branches is switched using Rt1, Rt2, and Rt3 [dBm] as threshold values.
【００２５】このダイバーシティ受信機の構成におい
て、もし受信電界強度ＲがＲｔ２＜Ｒ＜Ｒｔ１であった
とすると、電源制御部２５で制御し、２つの受信ブラン
チの電源をＯＮとし、残りの２つをＯＦＦとする。電源
がＯＮである受信ブランチが複数の場合は、それらの受
信ブランチで合成ダイバーシティ受信を行う。In the configuration of the diversity receiver, if the received electric field strength R satisfies Rt2 <R <Rt1, the power is controlled by the power control unit 25, the power of the two reception branches is turned on, and the remaining two are turned on. Turn off. When there are a plurality of receiving branches whose power is ON, the combined diversity reception is performed in those receiving branches.
【００２６】このようにして、アンテナ数が増えた場合
も、受信電界強度に応じて受信する受信ブランチ数を制
御し、消費電力を低減する。また、使用しない受信ブラ
ンチを受信電界強度の弱い受信ブランチから選択すれば
受信品質の向上を図ることができる。In this way, even when the number of antennas increases, the number of receiving branches to be received is controlled according to the received electric field strength, thereby reducing power consumption. In addition, the reception quality can be improved by selecting unused reception branches from reception branches having a weak reception electric field strength.
【００２７】（実施の形態３）本発明の実施の形態３の
ダイバーシテイ受信機の構成を図３のブロック図に示
す。(Embodiment 3) FIG. 3 is a block diagram showing a configuration of a diversity receiver according to Embodiment 3 of the present invention.
【００２８】図３において、１、２は飛来電磁波を受け
る各受信ブランチのアンテナ、３、４はアンテナ１、２
で受信した信号をダウンコンバートし、ベースバンド信
号と受信電界強度（ＲＳＳＩ）を出力する受信部、５
は、受信部３、４から受け取ったＲＳＳＩ信号をもとに
ベースバンド信号に重み付けをして合成するダイバーシ
ティ合成部、６はダイバーシティ合成部５からの出力を
受け、データを復調する復調部である。この実施の形態
３の特徴は、受信電界強度およびダイバーシティ合成部
５から出力される各受信ブランチの位相誤差情報に応じ
て受信部の電源のＯＮ／ＯＦＦを制御する電源制御部３
１を備え、電源制御部３１に各ブランチの位相誤差情報
を送るようにしたことにある。In FIG. 3, reference numerals 1 and 2 denote antennas of each receiving branch for receiving an incoming electromagnetic wave;
A receiving unit that down-converts the signal received by the unit and outputs a baseband signal and a received field strength (RSSI)
Is a diversity combining unit that weights and combines the baseband signals based on the RSSI signals received from the receiving units 3 and 4, and 6 is a demodulation unit that receives the output from the diversity combining unit 5 and demodulates the data. . A feature of the third embodiment is that a power supply control unit 3 that controls ON / OFF of a power supply of a reception unit according to reception electric field strength and phase error information of each reception branch output from the diversity synthesis unit 5.
1 to send the phase error information of each branch to the power supply control unit 31.
【００２９】このダイバーシティ受信機の構成におい
て、電源制御部３１に各ブランチの位相誤差情報を送る
ことから、電源制御部３１は受信電界強度に加えて、各
受信ブランチの位相誤差情報も考慮して電源制御を行う
ので、より的確に電源制御を行うことができる。In the configuration of the diversity receiver, since the phase error information of each branch is sent to the power control unit 31, the power control unit 31 considers the phase error information of each reception branch in addition to the received electric field strength. Since power control is performed, power control can be performed more accurately.
【００３０】[0030]
【発明の効果】以上の説明より明らかなように、本発明
はダイバーシティ受信機において、通信品質に応じて受
信する受信ブランチ数を可変とするものであり、そして
使用しない受信ブランチの電源を切ることにより消費電
力を低減できるという効果を有する。As is apparent from the above description, the present invention provides a diversity receiver in which the number of reception branches to be received is made variable in accordance with the communication quality, and the power of the unused reception branches is cut off. Thus, the power consumption can be reduced.
【図１】本発明の実施の形態１のダイバーシティ受信機
の構成を示すブロック図FIG. 1 is a block diagram illustrating a configuration of a diversity receiver according to a first embodiment of the present invention.
【図２】本発明の実施の形態２のダイバーシティ受信機
の構成を示すブロック図FIG. 2 is a block diagram showing a configuration of a diversity receiver according to a second embodiment of the present invention.
【図３】本発明の実施の形態３のダイバーシティ受信機
の構成を示すブロック図FIG. 3 is a block diagram showing a configuration of a diversity receiver according to a third embodiment of the present invention.
【図４】従来のダイバーシティ受信機の構成を示すブロ
ック図FIG. 4 is a block diagram showing a configuration of a conventional diversity receiver.
１、２、２１、２２ アンテナ ３、４、２３、２４ 受信部 ５ ダイバーシティ合成部 ６ 復調部 １１、２５、３１ 電源制御部 1, 2, 21, 22 Antenna 3, 4, 23, 24 Receiving unit 5 Diversity combining unit 6 Demodulating unit 11, 25, 31 Power control unit
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9314949AJPH11150497A (en) | 1997-11-17 | 1997-11-17 | Diversity receiver |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9314949AJPH11150497A (en) | 1997-11-17 | 1997-11-17 | Diversity receiver |
| Publication Number | Publication Date |
|---|---|
| JPH11150497Atrue JPH11150497A (en) | 1999-06-02 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9314949APendingJPH11150497A (en) | 1997-11-17 | 1997-11-17 | Diversity receiver |
| Country | Link |
|---|---|
| JP (1) | JPH11150497A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2345416A (en)* | 1998-11-02 | 2000-07-05 | Nec Corp | Reducing power consumption in a space diversity wireless communication apparatus |
| KR20060103712A (en)* | 2005-03-28 | 2006-10-04 | 주식회사 팬택앤큐리텔 | Mobile communication terminal and receiving terminal power control method implemented with reception diversity function |
| KR100753708B1 (en) | 2004-09-09 | 2007-08-30 | 가부시끼가이샤 도시바 | Receiving method and receiving device |
| WO2007108057A1 (en)* | 2006-03-16 | 2007-09-27 | Matsushita Electric Industrial Co., Ltd. | Diversity reception device |
| WO2007122714A1 (en)* | 2006-04-20 | 2007-11-01 | Panasonic Corporation | Diversity receiver apparatus |
| JP2009033532A (en)* | 2007-07-27 | 2009-02-12 | Sharp Corp | COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM |
| JP2009213157A (en)* | 2002-11-15 | 2009-09-17 | Interdigital Technol Corp | Wireless transmission/reception unit having multiple receivers, and method |
| JP2010200329A (en)* | 2002-04-05 | 2010-09-09 | Qualcomm Inc | Method and apparatus for determining reception diversity in mobile station |
| US7961825B2 (en) | 2005-11-24 | 2011-06-14 | Kabushiki Kaisha Toshiba | Diversity receiver and method |
| US8031622B2 (en) | 2002-02-19 | 2011-10-04 | Qualcomm, Incorporated | Method and apparatus for receive diversity in a communication system |
| WO2014132315A1 (en)* | 2013-02-27 | 2014-09-04 | パナソニック株式会社 | Receiver |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2345416B (en)* | 1998-11-02 | 2001-07-04 | Nec Corp | Wireless communication apparatus and power consumption reducing method thereof |
| US6600907B1 (en) | 1998-11-02 | 2003-07-29 | Nec Corporation | Wireless communication apparatus and power consumption reducing method thereof |
| GB2345416A (en)* | 1998-11-02 | 2000-07-05 | Nec Corp | Reducing power consumption in a space diversity wireless communication apparatus |
| US8031622B2 (en) | 2002-02-19 | 2011-10-04 | Qualcomm, Incorporated | Method and apparatus for receive diversity in a communication system |
| JP2010200329A (en)* | 2002-04-05 | 2010-09-09 | Qualcomm Inc | Method and apparatus for determining reception diversity in mobile station |
| JP2009213157A (en)* | 2002-11-15 | 2009-09-17 | Interdigital Technol Corp | Wireless transmission/reception unit having multiple receivers, and method |
| KR100753708B1 (en) | 2004-09-09 | 2007-08-30 | 가부시끼가이샤 도시바 | Receiving method and receiving device |
| KR20060103712A (en)* | 2005-03-28 | 2006-10-04 | 주식회사 팬택앤큐리텔 | Mobile communication terminal and receiving terminal power control method implemented with reception diversity function |
| US7961825B2 (en) | 2005-11-24 | 2011-06-14 | Kabushiki Kaisha Toshiba | Diversity receiver and method |
| WO2007108057A1 (en)* | 2006-03-16 | 2007-09-27 | Matsushita Electric Industrial Co., Ltd. | Diversity reception device |
| WO2007122714A1 (en)* | 2006-04-20 | 2007-11-01 | Panasonic Corporation | Diversity receiver apparatus |
| US8059770B2 (en) | 2006-04-20 | 2011-11-15 | Panasonic Corporation | Diversity receiving device |
| JP2009033532A (en)* | 2007-07-27 | 2009-02-12 | Sharp Corp | COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM |
| WO2014132315A1 (en)* | 2013-02-27 | 2014-09-04 | パナソニック株式会社 | Receiver |
| JP2014165847A (en)* | 2013-02-27 | 2014-09-08 | Panasonic Corp | Receiver |
| US9112482B2 (en) | 2013-02-27 | 2015-08-18 | Panasonic Corporation | Receiver |
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| Date | Code | Title | Description |
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| A977 | Report on retrieval | Free format text:JAPANESE INTERMEDIATE CODE: A971007 Effective date:20040206 | |
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