JP2003188784A - Single wireless repetition system - Google Patents
Single wireless repetition systemInfo
- Publication number
- JP2003188784A JP2003188784A JP2001382437A JP2001382437A JP2003188784A JP 2003188784 A JP2003188784 A JP 2003188784A JP 2001382437 A JP2001382437 A JP 2001382437A JP 2001382437 A JP2001382437 A JP 2001382437A JP 2003188784 A JP2003188784 A JP 2003188784A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- intermediate frequency
- relay
- radio
- 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.)
- Pending
Links
Landscapes
- Radio Relay Systems (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、単一ＦＭ無線機を
使用する通り中継方式に関するものである。
【０００２】
【従来の技術】図２に従来の通り中継方式の系統図を示
し説明する。
【０００３】ａ，ｂは通り中継局を構成する従来型の無
線機である。その動作は、無線機ａの受信出力を無線機
ｂの変調入力に、また無線機ｂの受信出力を無線機ａの
変調入力にそれぞれ接続し中継動作を行うものである。
【０００４】しかしこの中継方式の場合、受信波を音声
信号に復調し、その音声信号を相手無線機で変調し高周
波に変換し送信するため音声信号に劣化が発生してしま
う。特にＩＤＣ回路の微分回路、リミッタ回路及びスプ
ラッタフィルタによる信号ひずみ、周波数特性の劣化が
大きい。
【０００５】
【発明が解決しようとする課題】本発明は、通り中継無
線装置において従来の音声信号中継による信号劣化を防
止するものである。
【０００６】
【課題を解決するための手段】従来方式では音声信号を
中継する方式であったが、本方式では中継する２台の無
線機の相手受信機の中間周波信号を自局送信周波数に変
換する周波数変換回路を新たに設け、中間周波信号で中
継するものである。
【０００７】従って本方式によれば、受信機の復調回
路、送信機のＩＤＣ回路及び変調回路等を経由しないた
め音声信号の劣化を防止することが出来る。
【０００８】
【発明の実施の形態】図１に本発明の実施例を示し説明
する。
【０００９】ａ，ｂは通り中継局を構成する２台の無線
機、２〜９は無線機の内部を示しａ，ｂ無線機とも同一
である、１はアンテナ、２は受信波を増幅する高周波増
幅部、３は受信信号を中間周波数に変換するＩＦ変換
部、４は中間周波増幅部、５は中間周波数信号を音声信
号に復調する復調部、６は相手受信機の中間周波数を自
局送信周波数に変換する周波数変換部、７は電力増幅
部、８は音声信号を各種処理し変調信号作成するＩＤＣ
回路、９は変調部である。
【００１０】次に動作を説明する、無線機ａのアンテナ
１で受信された電波は高周波増幅部２で増幅されＩＦ変
換部３で中間周波数に変換される、中間周波増幅部４で
信号増幅され復調部５で音声信号に復調される。
【００１１】また中間周波増幅部４の出力は、相手無線
機ｂの周波数変換部６に接続され、無線機ｂの送信周波
数に変換し電力増幅部７で増幅し、無線機ｂのアンテナ
１から送信される。同様に無線機ｂで受信された信号は
無線機ｂの高周波増幅部２、ＩＦ変換部３、中間周波増
幅部４及び無線機ａの周波数変換部６、電力増幅部７を
経由し、アンテナ１から送信される。
【００１２】また、送信起動をかけるためのプレス信号
は従来通り受信機の復調部５のスケルチ信号で行う。
【００１３】
【発明の効果】このように受信機の中間周波信号を相手
無線機の送信周波数に変換し直接電力増幅部７に接続す
ることにより、受信機の復調部５、送信機のＩＤＣ回路
８、変調部９の回路を経由しないため信号の劣化が防止
できる。特にＩＤＣ回路８に入っている微分回路、リミ
ッタ回路及びスプラッタフィルタ等による信号のひず
み、周波数特性の劣化の影響を受けないので大幅な改善
が出来る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay system using a single FM radio. 2. Description of the Related Art FIG. 2 shows a system diagram of a conventional relay system, which will be described. [0003] Reference numerals a and b denote conventional radios that constitute a relay station. In this operation, the reception output of the radio device a is connected to the modulation input of the radio device b, and the reception output of the radio device b is connected to the modulation input of the radio device a to perform the relay operation. However, in the case of this relay system, a received wave is demodulated into an audio signal, and the audio signal is modulated by a partner radio, converted to a high frequency, and transmitted, so that the audio signal is deteriorated. In particular, signal distortion and deterioration of frequency characteristics due to the differentiation circuit, limiter circuit, and splatter filter of the IDC circuit are large. SUMMARY OF THE INVENTION [0005] The present invention is to prevent signal deterioration due to conventional voice signal relay in a repeater radio apparatus. Means for Solving the Problems In the conventional method, a method of relaying an audio signal is used. In the present method, an intermediate frequency signal of a partner receiver of two wireless devices to be relayed is set to a transmission frequency of the own station. A frequency conversion circuit for conversion is newly provided and relayed by an intermediate frequency signal. [0007] Therefore, according to the present system, since the signal does not pass through the demodulation circuit of the receiver, the IDC circuit and the modulation circuit of the transmitter, deterioration of the audio signal can be prevented. FIG. 1 shows an embodiment of the present invention. Reference numerals a and b denote two radios constituting a relay station, 2 to 9 denote the insides of the radios, and both a and b radios are the same, 1 is an antenna, and 2 is amplifying a received wave. A high-frequency amplifier 3, an IF converter 3 for converting a received signal into an intermediate frequency, an intermediate frequency amplifier 4, a demodulator 5 for demodulating the intermediate frequency signal into an audio signal, and a local station 6 for the intermediate frequency of the other receiver. A frequency conversion unit for converting to a transmission frequency, 7 is a power amplification unit, 8 is an IDC that performs various processing on an audio signal and creates a modulation signal
The circuit 9 is a modulator. Next, the operation will be described. The radio wave received by the antenna 1 of the wireless device a is amplified by the high frequency amplifier 2 and converted into an intermediate frequency by the IF converter 3, and the signal is amplified by the intermediate frequency amplifier 4. The audio signal is demodulated by the demodulation unit 5. The output of the intermediate frequency amplifying unit 4 is connected to the frequency converting unit 6 of the partner wireless device b, converted to the transmission frequency of the wireless device b, amplified by the power amplifying unit 7, and transmitted from the antenna 1 of the wireless device b. Sent. Similarly, the signal received by the wireless device b passes through the high-frequency amplifier 2, the IF converter 3, the intermediate frequency amplifier 4, the frequency converter 6 and the power amplifier 7 of the wireless device a, and the antenna 1 Sent from The press signal for starting transmission is performed by a squelch signal of the demodulation unit 5 of the receiver as in the conventional case. As described above, by converting the intermediate frequency signal of the receiver to the transmission frequency of the partner radio and connecting directly to the power amplifier 7, the demodulator 5 of the receiver and the IDC circuit of the transmitter are provided. 8. Since the signal does not pass through the circuit of the modulation unit 9, signal deterioration can be prevented. In particular, since there is no influence of signal distortion and deterioration of frequency characteristics due to the differentiating circuit, limiter circuit, splatter filter and the like included in the IDC circuit 8, a great improvement can be achieved.
【図面の簡単な説明】
【図１】本発明の実施例を示すブロック図。
【図２】従来の一例を示すブロック図。
【符号の説明】
ａ，ｂ：通り中継局を構成する２台の無線機、１：アン
テナ、２：受信電波を増幅する高周波増幅部、３：受信
信号を中間周波数に変換するＩＦ変換部、４：中間周波
増幅部、５：中間周波数信号を音声信号に復調する復調
部、６：相手受信機の中間周波数を自局送信周波数に変
換する周波数変換部、７：電力増幅部、８：音声信号を
各種処理し変調信号を作成するＩＤＣ回路、９：変調
部。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing an example of the related art. [Description of References] a, b: two wireless devices forming a relay station, 1: an antenna, 2: a high-frequency amplifier for amplifying a received radio wave, 3: an IF converter for converting a received signal to an intermediate frequency, 4: intermediate frequency amplifying unit, 5: demodulating unit for demodulating the intermediate frequency signal into an audio signal, 6: frequency converting unit for converting the intermediate frequency of the partner receiver to its own transmission frequency, 7: power amplifying unit, 8: audio An IDC circuit that performs various kinds of signal processing to generate a modulation signal, 9: a modulation unit.
Claims (1)
て、不感地域を解消するため無線局間の中間にそれぞれ
の無線局からの電波を中継する通り中継局を設置する場
合、前述通り中継局の無線装置に周波数変換回路を設け
受信機の中間周波信号を前述周波数変換回路を経由し、
中継相手無線装置の送信機電力増幅部に接続することに
より、信号の劣化を防止することを特徴とする単一無線
機の通り中継方式。Claims: 1. In a wireless communication using a single wireless device, a relay station is installed at an intermediate position between wireless stations so as to relay a radio wave from each wireless station in order to eliminate a blind area. In the case, as described above, a frequency conversion circuit is provided in the wireless device of the relay station, and the intermediate frequency signal of the receiver passes through the frequency conversion circuit,
A relay system as in a single radio, characterized in that the signal is prevented from being degraded by being connected to a transmitter power amplifying unit of a relay partner radio device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001382437A JP2003188784A (en) | 2001-12-17 | 2001-12-17 | Single wireless repetition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001382437A JP2003188784A (en) | 2001-12-17 | 2001-12-17 | Single wireless repetition system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003188784A true JP2003188784A (en) | 2003-07-04 |
Family
ID=27592778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001382437A Pending JP2003188784A (en) | 2001-12-17 | 2001-12-17 | Single wireless repetition system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003188784A (en) |
-
2001
- 2001-12-17 JP JP2001382437A patent/JP2003188784A/en active Pending
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