JPH09321691A - Radio telephone equipment - Google Patents
Radio telephone equipmentInfo
- Publication number
- JPH09321691A JPH09321691A JP8133385A JP13338596A JPH09321691A JP H09321691 A JPH09321691 A JP H09321691A JP 8133385 A JP8133385 A JP 8133385A JP 13338596 A JP13338596 A JP 13338596A JP H09321691 A JPH09321691 A JP H09321691A
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- band
- changeover switch
- narrow band
- filter
- 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.)
- Granted
Links
Landscapes
- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、携帯電話機等の受
信機の中間周波数回路の構成に関し、特に、IF(中間
周波数)帯域幅の異なった2つのセルラー電話システム
で、両システム使用可能な無線電話装置の中間周波数回
路の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an intermediate frequency circuit of a receiver such as a mobile phone, and more particularly, to a wireless system capable of using both systems in two cellular phone systems having different IF (intermediate frequency) bandwidths. The present invention relates to the configuration of an intermediate frequency circuit of a telephone device.
【0002】[0002]
【従来の技術】従来技術として、特開昭57−1843
28号公報に記載の受信機のIF帯域幅の切換え制御装
置がある。図2に、この従来装置の構成を示す。図2に
おいて、11は広帯域BPF(Bandpass Fi
lter)、13は狭帯域BPF、12と14は切換え
スイッチ、15はIF(Intermediate F
requency)レベル検出器、16はORゲート、
17はAM検波器、18は9KHzビートレベル検出器
をそれぞれ示す。2. Description of the Related Art As the prior art, Japanese Patent Laid-Open No. 57-1843
There is a receiver IF bandwidth switching control device described in Japanese Patent No. 28. FIG. 2 shows the configuration of this conventional device. In FIG. 2, 11 is a wide band BPF (Bandpass Fi).
lter), 13 is a narrow band BPF, 12 and 14 are changeover switches, and 15 is an IF (Intermediate FPF).
frequency) level detector, 16 is an OR gate,
Reference numeral 17 is an AM detector, and 18 is a 9 KHz beat level detector.
【0003】このような受信機のIF帯域幅の切換え制
御装置においては、隣接信号と希望波信号とのビート成
分を、AM検波器17で検出し、隣接チャンネルとの周
波数間隔9KHz成分を、9KHzビートレベル検出器
18で更に選択検出し、この検出レベルがある値以上に
なった時に、切換えスイッチ12,14を狭帯域BPF
13側へ切換えるように制御し、IF帯域幅を狭帯域特
性として、隣接波による混信妨害を排除している。In such a receiver IF bandwidth switching control device, the AM detector 17 detects the beat component between the adjacent signal and the desired wave signal, and detects the frequency interval of 9 KHz between the adjacent channel and 9 KHz. When the beat level detector 18 further selects and detects, and when the detection level exceeds a certain value, the changeover switches 12 and 14 are switched to the narrow band BPF.
By controlling so as to switch to the 13 side, the IF bandwidth has a narrow band characteristic to eliminate interference due to adjacent waves.
【0004】また、IFレベル検出器15によって、受
信電界強度が、所定レベル以下となった場合は、同様
に、切換えスイッチ12,14を狭帯域BPF13側へ
切換えるように制御し、IF帯域幅を狭帯域特性とし
て、低電界時のS/N向上を図っている。When the received electric field strength falls below a predetermined level by the IF level detector 15, similarly, the changeover switches 12 and 14 are controlled so as to be switched to the narrow band BPF 13 side, and the IF bandwidth is changed. As a narrow band characteristic, S / N is improved at a low electric field.
【0005】このように、図2の従来技術では、混信発
生時および低電界時に、IF帯域幅を狭帯域へ切換え
て、混信妨害の排除、希望信号のS/N向上を図る利点
がある。As described above, the conventional technique shown in FIG. 2 has the advantages of switching the IF bandwidth to a narrow band when interference occurs and at a low electric field to eliminate interference and improve the S / N of the desired signal.
【0006】しかし、図2の従来例の構成では、IF帯
域幅の異なる2つのセルラー電話システムの両方で使用
可能な、中間周波数回路を提供できないという問題があ
る。However, the configuration of the conventional example of FIG. 2 has a problem that it cannot provide an intermediate frequency circuit that can be used in both two cellular telephone systems having different IF bandwidths.
【0007】このような問題を解決した装置例を、図3
に示す。1は受信ミキサー回路、2は広帯域IFフィル
タ、3は狭帯域IFフィルタ、4,5は切換えスイッ
チ、7は中間周波数増幅回路(IF増幅器)、8は復調
器(ディスクリミネータ)、9はIF帯域幅切換え制御
信号を示す。北米等の地域における、AMPS(Adv
anced Mobile Phone servic
e)システムとナローAMPSシステム(以下、NAM
PSシステム)との両システムで動作可能な、デュアル
システム対応携帯電話機等に代表される無線電話装置で
は、基地局より、IF帯域幅が広帯域なAMPSシステ
ムに指定された場合、図示されていない制御部よりのI
F帯域幅切換え制御信号9により、切換えスイッチ4,
5は、広帯域IFフィルタ2側へ切換えるよう制御され
る。受信信号は、受信ミキサー回路1から、広帯域IF
フィルタ2を経由し、IF増幅器7で増幅され、復調器
8で復調され、受信音声またはデータへ変換される。An example of an apparatus that solves such a problem is shown in FIG.
Shown in 1 is a reception mixer circuit, 2 is a wide band IF filter, 3 is a narrow band IF filter, 4 and 5 are changeover switches, 7 is an intermediate frequency amplifier circuit (IF amplifier), 8 is a demodulator (discriminator), and 9 is an IF. 3 shows a bandwidth switching control signal. AMPS (Adv
anced Mobile Phone service
e) System and narrow AMPS system (hereinafter NAM
In a radiotelephone device typified by a dual system compatible mobile phone capable of operating in both systems (PS system), when a base station specifies an AMPS system having a wide IF bandwidth, a control not shown I from the department
By the F bandwidth switching control signal 9, the changeover switch 4,
5 is controlled to switch to the wide band IF filter 2 side. The received signal is sent from the receiving mixer circuit 1 to the wideband IF.
After passing through the filter 2, the signal is amplified by the IF amplifier 7, demodulated by the demodulator 8 and converted into received voice or data.
【0008】一方、基地局より、IF帯域幅が狭帯域な
NAMPSシステムに指定された場合、同様に、IF帯
域幅切換え制御信号9により、切換えスイッチ4,5
は、狭帯域IFフィルタ3側へ切換えるよう制御され
る。受信信号は、受信ミキサー回路1から、狭帯域IF
フィルタ3を経由し、IF増幅器7で増幅され、復調器
8で復調され、受信音声またはデータへ変換される。On the other hand, when the base station specifies the NAMPS system having a narrow IF bandwidth, the IF bandwidth switching control signal 9 similarly causes the changeover switches 4 and 5 to operate.
Are controlled to switch to the narrow band IF filter 3 side. The received signal is sent from the receiving mixer circuit 1 to the narrow band IF.
After passing through the filter 3, the signal is amplified by the IF amplifier 7, demodulated by the demodulator 8 and converted into received voice or data.
【0009】[0009]
【発明が解決しようとする課題】図3に示す従来の回路
構成では、狭帯域のセルラー電話システムで動作させた
場合、特に、フェージング有時の受信ビットエラーレイ
トが悪化し、接続率が劣化する問題があった。In the conventional circuit configuration shown in FIG. 3, when operated in a narrow band cellular telephone system, the received bit error rate is deteriorated particularly in the presence of fading and the connection rate is deteriorated. There was a problem.
【0010】これは、IF帯域幅が狭帯域と広帯域との
両方の場合で、IF増幅器7を共通使用しているため、
IF増幅器7の利得を広帯域で最適となる様に設定した
場合、狭帯域では、IF増幅器の利得が不足し、フェー
ジング等の入力電界変動時に、良好な受信機性能を発揮
できないことによる。This is the case where the IF bandwidth is both narrow band and wide band, and since the IF amplifier 7 is commonly used,
This is because, when the gain of the IF amplifier 7 is set to be optimum in a wide band, the gain of the IF amplifier is insufficient in a narrow band, and good receiver performance cannot be exhibited when the input electric field changes such as fading.
【0011】一般的に、狭帯域では、帯域が狭い分、サ
ーマルノイズが低下するため、受信機のトータルゲイン
は、広帯域よりも多く必要とする。Generally, in the narrow band, the thermal noise is reduced due to the narrow band, so that the total gain of the receiver is required to be larger than that of the wide band.
【0012】一方、IF増幅器7の利得を、狭帯域で最
適となる様に設定した場合、広帯域では、IF増幅器の
利得が過剰となり、増幅器の飽和点が中から強の入力電
界でも起こってしまい、中から強の入力電界の場合、受
信歪率の劣化を引き起こす欠点があった。On the other hand, when the gain of the IF amplifier 7 is set to be optimum in a narrow band, the gain of the IF amplifier becomes excessive in a wide band, and the saturation point of the amplifier occurs even in a medium to strong input electric field. However, in the case of a medium to strong input electric field, there is a drawback that the deterioration of the reception distortion rate occurs.
【0013】本発明の目的は、上述の欠点を除去し、I
F帯域幅の異なる複数のセルラー電話システムで動作可
能な無線電話装置を提供することにある。The object of the invention is to eliminate the above-mentioned drawbacks,
An object of the present invention is to provide a wireless telephone device that can operate in a plurality of cellular telephone systems having different F bandwidths.
【0014】[0014]
【課題を解決するための手段】受信機のIF帯域幅を広
帯域と狭帯域へ切換えて、複数の異なったセルラー電話
システムで動作する無線電話装置において、IF帯域幅
が、狭帯域幅へ切換わった場合、受信機のIF増幅回路
の利得を、広帯域の場合よりも増加させる手段を有す
る。In a radiotelephone device operating in a plurality of different cellular telephone systems, the IF bandwidth of the receiver is switched to wideband and narrowband, and the IF bandwidth is switched to narrowband. In this case, it has means for increasing the gain of the IF amplifier circuit of the receiver as compared with the case of the wide band.
【0015】具体的には、IF帯域幅を切換える切換え
スイッチの経路が狭帯域側へ切換わると、IF増幅器の
利得が、広帯域時のIF増幅器の利得に加算されるた
め、狭帯域時の利得は、広帯域時より増加し、狭帯域時
に最適な利得に設定できる。Specifically, when the path of the changeover switch for changing the IF bandwidth is changed to the narrow band side, the gain of the IF amplifier is added to the gain of the IF amplifier in the wide band, so that the gain in the narrow band is obtained. Is increased over the wide band, and the optimum gain can be set for the narrow band.
【0016】[0016]
【発明の実施の形態】以下、図面に基づいて、本発明の
無線電話装置の実施例を説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a wireless telephone device of the present invention will be described below with reference to the drawings.
【0017】図1は、本発明の一実施例のブロック図を
示す。この無線電話装置は、図3の従来例の構成に加
え、IF増幅器6が、狭帯域IFフィルタ3側へ、追加
された構成となっている。すなわち、受信ミキサー回路
1を備え、その出力は切換えスイッチ4の接点4aに接
続されている。切換えスイッチ4の接点4bは、狭帯域
IFフィルタ3およびIF増幅器6を経て、切換えスイ
ッチの接点5bに接続されている。また、切換えスイッ
チ4の接点4cは、広帯域IFフィルタ2を経て、切換
えスイッチの接点5cに接続されている。FIG. 1 shows a block diagram of one embodiment of the present invention. This wireless telephone device has a configuration in which an IF amplifier 6 is added to the narrow band IF filter 3 side in addition to the configuration of the conventional example of FIG. That is, the receiving mixer circuit 1 is provided, and its output is connected to the contact 4 a of the changeover switch 4. The contact 4b of the changeover switch 4 is connected to the contact 5b of the changeover switch via the narrow band IF filter 3 and the IF amplifier 6. Further, the contact 4c of the changeover switch 4 is connected to the contact 5c of the changeover switch through the broadband IF filter 2.
【0018】切換えスイッチ5の接点5aは、IF増幅
器7の入力に接続され、増幅器7の出力は復調器(ディ
スクリミネータ)8の入力に接続されている。切換えス
イッチ4,5は、IF帯域幅切換え制御信号9により、
その切換えが制御される。The contact 5a of the changeover switch 5 is connected to the input of the IF amplifier 7, and the output of the amplifier 7 is connected to the input of the demodulator (discriminator) 8. The changeover switches 4 and 5 are controlled by the IF bandwidth changeover control signal 9.
The switching is controlled.
【0019】次に、本実施例の動作について説明する。Next, the operation of this embodiment will be described.
【0020】基地局(図示せず)より、IF帯域幅が広
帯域に指定された場合、IF帯域幅切換え制御信号9に
より、切換えスイッチ4,5は、広帯域IFフィルタ2
側へ切換えるよう制御される。すなわち、切換えスイッ
チ4では接点4aと接点4cとが接続され、切換えスイ
ッチ5では接点5aと接点5cとが接続されている。When the IF band width is designated by the base station (not shown) as a wide band, the changeover switches 4 and 5 cause the wide band IF filter 2 by the IF band width change control signal 9.
It is controlled to switch to the side. That is, in the changeover switch 4, the contacts 4a and 4c are connected, and in the changeover switch 5, the contacts 5a and 5c are connected.
【0021】このような切換えスイッチ4,5の切換え
状態では、受信信号は、受信ミキサー回路1から、広帯
域IFフィルタ2を経由し、IF増幅器7で増幅され、
復調器8で復調され、受信音声またはデータへ変換され
る。ここで、IF増幅器7の利得は、広帯域のとき最適
となるように設定されている。In such a switching state of the changeover switches 4 and 5, the reception signal is amplified from the reception mixer circuit 1 through the wide band IF filter 2 and by the IF amplifier 7,
It is demodulated by the demodulator 8 and converted into received voice or data. Here, the gain of the IF amplifier 7 is set to be optimum in a wide band.
【0022】一方、基地局より、IF帯域幅が狭帯域に
指定された場合、IF帯域幅切換え制御信号9により、
切換えスイッチ4,5は、狭帯域IFフィルタ3側へ切
換えるよう制御される。すなわち、切換えスイッチ4で
は接点4aと接点4bとが接続され、切換えスイッチ5
では接点5aと接点5bとが接続されている。On the other hand, when the IF bandwidth is designated as a narrow band by the base station, the IF bandwidth switching control signal 9 causes
The changeover switches 4 and 5 are controlled so as to switch to the narrow band IF filter 3 side. That is, in the changeover switch 4, the contacts 4a and 4b are connected, and the changeover switch 5
In, the contact 5a and the contact 5b are connected.
【0023】このような切換えスイッチ4,5の切換え
状態では、狭帯域時のIF利得は、IF増幅器6の利得
が、広帯域時のIF増幅器7の利得に、加算されるた
め、広帯域時より増加し、狭帯域時に最適な利得に設定
可能となる。狭帯域時の受信信号は、受信ミキサー回路
1から、狭帯域IFフィルタ3を経由し、IF増幅器6
および7で増幅され、復調器8で復調され、受信音声ま
たはデータへ変換される。In such a switching state of the change-over switches 4 and 5, the IF gain in the narrow band is increased because the gain of the IF amplifier 6 is added to the gain of the IF amplifier 7 in the wide band. However, it is possible to set the optimum gain in a narrow band. The reception signal in the narrow band passes from the reception mixer circuit 1 through the narrow band IF filter 3 to the IF amplifier 6
Amplified by 7 and 7, demodulated by the demodulator 8 and converted into received voice or data.
【0024】[0024]
【発明の効果】以上説明したように、本発明は、同一無
線電話装置のIF帯域幅を切換えて、IF帯域幅の異な
る複数のセルラー電話システムで動作させる場合、IF
増幅器の利得を、IF帯域幅に応じて最適となるように
設定できる構成のため、受信機のトータルゲイン不足に
起因する、フェージング有時の受信ビットエラーレイト
が劣化しない効果を有する。As described above, according to the present invention, when the IF bandwidth of the same radio telephone device is switched to operate in a plurality of cellular telephone systems having different IF bandwidths,
Since the gain of the amplifier can be set to be optimum according to the IF bandwidth, there is an effect that the received bit error rate in the presence of fading does not deteriorate due to insufficient total gain of the receiver.
【0025】また、本発明は、IF増幅器の過剰利得に
起因する、強入力電界時の受信歪率の劣化を防止する利
点も有する。The present invention also has an advantage of preventing the deterioration of the reception distortion rate in the strong input electric field due to the excessive gain of the IF amplifier.
【図1】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
【図2】従来の無線電話装置を示すブロック図である。FIG. 2 is a block diagram showing a conventional wireless telephone device.
【図3】従来の無線電話装置を示すブロック図である。FIG. 3 is a block diagram showing a conventional wireless telephone device.
1 受信ミキサー回路 2 広帯域IFフィルタ 3 狭帯域IFフィルタ 4,5 切換えスイッチ 6,7 中間周波数増幅回路(IF増幅器) 8 復調器(ディスクリミネータ) 9 IF帯域幅切換え制御信号 11 広帯域BPF 12,14 切換えスイッチ 13 狭帯域BPF 15 IFレベル検出器 16 ORゲート 17 AM検波器 18 9KHzビートレベル検出器 1 Receiving Mixer Circuit 2 Wideband IF Filter 3 Narrowband IF Filter 4,5 Switching Switch 6,7 Intermediate Frequency Amplifier Circuit (IF Amplifier) 8 Demodulator (Discriminator) 9 IF Bandwidth Switching Control Signal 11 Wideband BPF 12,14 Changeover switch 13 Narrow band BPF 15 IF level detector 16 OR gate 17 AM detector 189 KHz beat level detector
Claims (5)
周波数帯域幅を広帯域と狭帯域とに切換えて、異なった
複数のセルラー電話システムで動作することが可能な無
線電話装置において、 前記中間周波数帯域幅が狭帯域へ切換わった場合、前記
中間周波数増幅回路の利得を広帯域の場合よりも増加さ
せる手段を有することを特徴とする無線電話装置。1. A radiotelephone device comprising an intermediate frequency amplifier circuit, which is capable of operating in a plurality of different cellular telephone systems by switching the intermediate frequency bandwidth of a receiver between a wide band and a narrow band. A radiotelephone device comprising means for increasing the gain of the intermediate frequency amplifier circuit when the frequency bandwidth is switched to a narrow band as compared with the case of a wideband.
サー回路と、 前記受信ミキサー回路の出力を切換えて出力する第1の
切換えスイッチと、 前記第1の切換えスイッチの第1の出力端子に接続され
た狭帯域中間周波数フィルタと、 前記狭帯域中間周波数フィルタに接続された第1の中間
周波数増幅回路と、 前記第1の切換えスイッチの第2の出力端子に接続され
た広帯域中間周波数フィルタと、 前記第1の中間周波数増幅回路の出力と、前記広帯域中
間周波数フィルタとの出力を切換えて出力する第2の切
換えスイッチと、 前記第2の切換えスイッチの出力端子に接続された第2
の中間周波数増幅回路と、 前記第2の中間周波数増幅回路の出力を復調する復調回
路と、を備えることを特徴とする無線電話装置。2. A reception mixer circuit for converting a reception signal to an intermediate frequency, a first changeover switch for changing over and outputting the output of the reception mixer circuit, and a first output terminal of the first changeover switch. A narrow band intermediate frequency filter, a first intermediate frequency amplifier circuit connected to the narrow band intermediate frequency filter, a wide band intermediate frequency filter connected to a second output terminal of the first changeover switch, A second changeover switch for switching and outputting the output of the first intermediate frequency amplifier circuit and the output of the wideband intermediate frequency filter; and a second changeover switch connected to an output terminal of the second changeover switch.
And a demodulation circuit that demodulates the output of the second intermediate frequency amplification circuit.
中間周波数帯域幅が広帯域に指定された場合に、前記第
1の切換えスイッチと前記第2の切換えスイッチとの間
に、前記広帯域中間周波数フィルタが接続され、中間周
波数帯域幅が狭帯域に指定された場合に、前記第1の切
換えスイッチと前記第2の切換えスイッチとの間に、前
記狭帯域中間周波数フィルタおよび前記第1の中間周波
数増幅回路が接続されるように切換えられる、ことを特
徴とする請求項2記載の無線電話装置。3. The first and second changeover switches,
When the intermediate frequency band width is designated as a wide band, the wide band intermediate frequency filter is connected between the first changeover switch and the second changeover switch, and the intermediate frequency band width is designated as a narrow band. In this case, the narrow band intermediate frequency filter and the first intermediate frequency amplifier circuit are switched between the first changeover switch and the second changeover switch. The wireless telephone device according to claim 2.
中間周波数帯域幅が広帯域に指定された場合に、最適と
なるように設定される、ことを特徴とする請求項3記載
の無線電話装置。4. The gain of the second intermediate frequency amplifier circuit is:
4. The wireless telephone device according to claim 3, wherein the wireless telephone device is set to be optimum when the intermediate frequency bandwidth is designated as a wide band.
換えは、基地局からの指示により行われる、ことを特徴
とする請求項4記載の無線電話装置。5. The radiotelephone apparatus according to claim 4, wherein the switching of the first and second changeover switches is performed by an instruction from a base station.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08133385A JP3080879B2 (en) | 1996-05-28 | 1996-05-28 | Wireless telephone equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08133385A JP3080879B2 (en) | 1996-05-28 | 1996-05-28 | Wireless telephone equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09321691A true JPH09321691A (en) | 1997-12-12 |
JP3080879B2 JP3080879B2 (en) | 2000-08-28 |
Family
ID=15103507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP08133385A Expired - Fee Related JP3080879B2 (en) | 1996-05-28 | 1996-05-28 | Wireless telephone equipment |
Country Status (1)
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JP (1) | JP3080879B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010028098A (en) * | 1999-09-17 | 2001-04-06 | 박종섭 | Frequency down converting apparatus in CDMA mobile communication system |
US6351504B1 (en) | 1997-12-26 | 2002-02-26 | Alps Electric Co., Ltd. | Reception circuit |
KR20030016747A (en) * | 2001-08-21 | 2003-03-03 | 엘지전자 주식회사 | Wide band receiving apparatus for communication mobile device |
JP2009017028A (en) * | 2007-07-02 | 2009-01-22 | Panasonic Corp | Transmitter |
KR101030740B1 (en) * | 2010-09-07 | 2011-04-26 | 엘아이지넥스원 주식회사 | Signal reciever and signal recieving method |
US9270301B2 (en) | 1998-11-26 | 2016-02-23 | Nokia Technologies Oy | Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems |
-
1996
- 1996-05-28 JP JP08133385A patent/JP3080879B2/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6351504B1 (en) | 1997-12-26 | 2002-02-26 | Alps Electric Co., Ltd. | Reception circuit |
US9270301B2 (en) | 1998-11-26 | 2016-02-23 | Nokia Technologies Oy | Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems |
KR20010028098A (en) * | 1999-09-17 | 2001-04-06 | 박종섭 | Frequency down converting apparatus in CDMA mobile communication system |
KR20030016747A (en) * | 2001-08-21 | 2003-03-03 | 엘지전자 주식회사 | Wide band receiving apparatus for communication mobile device |
JP2009017028A (en) * | 2007-07-02 | 2009-01-22 | Panasonic Corp | Transmitter |
KR101030740B1 (en) * | 2010-09-07 | 2011-04-26 | 엘아이지넥스원 주식회사 | Signal reciever and signal recieving method |
Also Published As
Publication number | Publication date |
---|---|
JP3080879B2 (en) | 2000-08-28 |
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