JPH0516748Y2 - - Google Patents
Info
- Publication number
- JPH0516748Y2 JPH0516748Y2 JP1985069954U JP6995485U JPH0516748Y2 JP H0516748 Y2 JPH0516748 Y2 JP H0516748Y2 JP 1985069954 U JP1985069954 U JP 1985069954U JP 6995485 U JP6995485 U JP 6995485U JP H0516748 Y2 JPH0516748 Y2 JP H0516748Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- station
- oscillator
- frequency
- output
- 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.)
- Expired - Lifetime
Links
- 230000010355 oscillation Effects 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000005236 sound signal Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010356 wave oscillation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Transceivers (AREA)
Description
本考案は、双方向FM無線通信機に係り、特に
送受信回路に関する。
The present invention relates to a two-way FM radio communication device, and more particularly to a transmitting/receiving circuit.
双方向FM無線通信機においては、搬送波発振
部の搬送波信号を音声等の送信信号によつて変調
し、この変調信号を電力増幅してデユプレクサ、
アンテナを通して送信し、一方受信には相手局か
らのFM電波を該アンテナ、デユプレクサを通し
て取込み、この信号を高周波増幅して第１局部発
振部の局部発振信号と混合して中間周波信号を
得、さらには第２局部発振部等を有してオーデイ
オ信号を取出す構成になつている。
In a two-way FM radio communication device, the carrier wave signal of the carrier wave oscillation unit is modulated by a transmission signal such as voice, and this modulated signal is power-amplified and transmitted to a duplexer,
The signal is transmitted through the antenna, and for reception, the FM radio wave from the other station is taken in through the antenna and duplexer, and this signal is high-frequency amplified and mixed with the local oscillation signal of the first local oscillation section to obtain an intermediate frequency signal. is configured to have a second local oscillation section and the like to extract an audio signal.
従来の双方向無線機において、送受夫々に個別
の発振部（搬送波発振部と第１局部発振部）を設
ける場合と、送受兼用の発振部を設ける場合があ
る。前者は、送信系と受信系が完全に分離される
ため、送信中に自局の送信信号をモニタすること
ができず、双方向通信の自然な対話状態を得るこ
とができない問題があつた。後者は変調された搬
送波信号を自局の受信系を通してモニタすること
ができるが、変調された周波数偏移は送信に必要
な周波数偏移となつているため、再生されたモニ
タ信号は相手局からの受信信号と同等レベルで再
生されることになり、自局のモニタ信号によつて
相手局信号が抑圧されてその明瞭度が低下する問
題があつた。
In conventional two-way radios, separate oscillation sections (carrier wave oscillation section and first local oscillation section) are provided for each transmission and reception, and there are cases where an oscillation section is provided for both transmission and reception. In the former case, since the transmitting system and the receiving system are completely separated, it is impossible to monitor the transmitting signal of the own station during transmission, and there is a problem that it is impossible to obtain a natural dialogue state of two-way communication. The latter allows the modulated carrier signal to be monitored through the reception system of the own station, but since the modulated frequency deviation is the frequency deviation necessary for transmission, the reproduced monitor signal is transmitted from the other station. The problem is that the signal of the other station is suppressed by the monitor signal of the own station, reducing its clarity.
本考案は上記問題点に鑑みてなされたもので、
送信信号によつて変調される第１の発振器の発振
出力と第２の発振器の発振出力を混合して第１局
部発振周波数信号を得、この信号と相手局から受
信した高周波信号とを混合することによつて中間
周波信号を得る構成とし、第１局部発振周波数信
号に自局の送信信号による周波数偏移をもたせ、
しかも相手局の周波数偏移よりも抑圧しながら再
生音に自局の送信信号成分を含ませるようにした
ものである。
This idea was created in view of the above problems.
The oscillation output of the first oscillator modulated by the transmission signal and the oscillation output of the second oscillator are mixed to obtain a first local oscillation frequency signal, and this signal is mixed with the high frequency signal received from the partner station. the first local oscillation frequency signal has a frequency shift caused by the transmission signal of the local station;
Furthermore, the transmitted signal component of the own station is included in the reproduced sound while suppressing the frequency shift of the other station.
図面は本考案の一実施例を示す要部回路図であ
る。マイクロホン１からの音声信号（送信信号）
は送信搬送波分と受信局発分に共通の第１の発振
器２の周波数変調信号入力とされる。第１の発振
器２の変調出力はＮ次の逓倍器３で送信に必要な
Ｎ倍の周波数、変調度を持つ信号に変換される。
送信電力増幅器４は逓倍器３の出力を電力増幅
し、この出力がデユプレクサ５、アンテナ６を通
して相手局に送信される。こうした送信回路に対
して、相手局からの受信電波はアンテナ６、デユ
プレクサ５を通してバンドパスフイルタ７に取込
まれ、このバンドパスフイルタ７の後段には高周
波増幅器８、バンドパスフイルタ９が設けられて
相手局の高周波信号が増幅、選択して取出され
る。バンドパスフイルタ９の出力はミキサ１０に
よつて第１局部発振周波数信号との混合がなされ
て中間周波信号IFが取出され、この中間周波信
号が第２局発信号との混合、検波、増幅等の受信
回路（図示しない）によつて再生される。
ここで、第１局部発振周波数信号は、共通の第
１の発振器２の変調信号（発振）出力と発振器１
１の一定周波数の発振信号とがミキサ１２で混合
され、このミキサ１２の出力をバンドパスフイル
タ１３を通して取出される。
なお、発振器２，１１にはPLLシンセサイザ
方式の発振回路等によつて構成される。
こうした構成において、送信系は、発振器２の
発振周波数を1とすればこれに音声信号で周波数
変調をかけ、逓倍器３でＮ逓倍されて目的とする
送信周波数TX（＝1×ｎ）を得ると同時に目的と
する変調度も得る。一方、受信系ではアンテナ６
で受信する電波の周波数RXに対して、ミキサ１
０に入力される局部発振周波数Lとの混合によつ
て中間周波信号IFを得るが、このときの周波数L
は、発振器２と１１の両周波数1と2の加算した
値1＋2になり、しかも周波数1が音声によつて
変調されている。従つて、中間周波信号IFは音
声によつて変調された周波数1成分も含まれ、通
話状態では自局の音声が相手局の音声と同時に受
信音として再生（モニタ）される。しかも、自局
の音声周波数偏移は相手局のそれよりも発振器１
１の存在等によつて小さくなつており、このため
相手局の音声よりも抑圧された自局のモニタ音に
なる。
The drawing is a main circuit diagram showing an embodiment of the present invention. Audio signal from microphone 1 (transmission signal)
is the frequency modulated signal input of the first oscillator 2 common to the transmission carrier wave and the reception station oscillation. The modulated output of the first oscillator 2 is converted by an N-order multiplier 3 into a signal having N times the frequency and modulation factor required for transmission.
A transmission power amplifier 4 amplifies the power of the output of the multiplier 3, and this output is transmitted to a partner station through a duplexer 5 and an antenna 6. For such a transmitting circuit, radio waves received from the other station are taken into a bandpass filter 7 through an antenna 6 and a duplexer 5, and a high frequency amplifier 8 and a bandpass filter 9 are provided at the downstream stage of the bandpass filter 7. The high frequency signal of the other station is amplified, selected and extracted. The output of the bandpass filter 9 is mixed with the first local oscillation frequency signal by the mixer 10 to extract an intermediate frequency signal IF, and this intermediate frequency signal is mixed with the second local oscillation signal, detected, amplified, etc. is reproduced by a receiving circuit (not shown). Here, the first local oscillation frequency signal is the modulation signal (oscillation) output of the common first oscillator 2 and the oscillator 1
1 and an oscillation signal of a constant frequency are mixed in a mixer 12, and the output of this mixer 12 is taken out through a bandpass filter 13. Incidentally, the oscillators 2 and 11 are constituted by a PLL synthesizer type oscillation circuit or the like. In such a configuration, in the transmission system, if the oscillation frequency of the oscillator 2 is 1 , it is frequency-modulated with an audio signal, and multiplier 3 multiplies it by N to obtain the target transmission frequency TX (= 1 × n). At the same time, the desired degree of modulation is also obtained. On the other hand, in the receiving system, antenna 6
Mixer 1
The intermediate frequency signal IF is obtained by mixing with the local oscillation frequency L input to 0, but the frequency L at this time
is the sum of frequencies 1 and 2 of oscillators 2 and 11, which is 1 + 2 , and frequency 1 is modulated by the voice. Therefore, the intermediate frequency signal IF also includes one frequency component modulated by the voice, and in a call state, the voice of the local station is reproduced (monitored) as the received sound at the same time as the voice of the other station. Moreover, the audio frequency deviation of the own station is higher than that of the other station due to oscillator 1.
Therefore, the monitor sound of the own station is suppressed more than the sound of the other station.
以上のとおり、本考案によれば、送信搬送波の
変調信号を自局の第１局部発振周波数信号に含ま
せて受信高周波信号との混合を行うようにしたた
め、自局信号を自局受信系を通じて相手局信号よ
りも再生音を抑圧してモニタすることができ、相
手局の信号の明瞭度を低下させることなく自局と
相手局側の双方の信号が含まれた再生音になつて
双方向での通話に不自然さが無くなるという良好
な通話状態を得ることができる効果がある。ま
た、自局の変調状態を自局再生音から確認するこ
とができる。
As described above, according to the present invention, since the modulation signal of the transmitting carrier wave is included in the first local oscillation frequency signal of the own station and mixed with the received high frequency signal, the own station signal is transmitted through the own station receiving system. The playback sound can be suppressed and monitored more than the other station's signal, and the playback sound includes both the own and the other station's signals without reducing the clarity of the other station's signal. This has the effect of making it possible to obtain a good call condition in which there is no unnaturalness in the call. Furthermore, the modulation state of the own station can be confirmed from the sound reproduced by the own station.
図面は本考案の一実施例を示す要部回路図であ
る。
１……マイクロホン、２……共通の発振器、３
……逓倍器、４……電力増幅器、５……デユプレ
クサ、６……アンテナ、７，９，１３……バンド
パスフイルタ、８……高周波増幅器、１０……ミ
キサ、１１……発振器、１２……ミキサ。
The drawing is a main circuit diagram showing an embodiment of the present invention. 1...Microphone, 2...Common oscillator, 3
... Multiplier, 4 ... Power amplifier, 5 ... Duplexer, 6 ... Antenna, 7, 9, 13 ... Bandpass filter, 8 ... High frequency amplifier, 10 ... Mixer, 11 ... Oscillator, 12 ... ...Mixer.
Claims (1)
１の発振器と、この発振器の出力を逓倍して送信
する送信回路と、前記第１の発振器の送信信号に
よつて変調された発振出力と第２の発振器の出力
とを混合して第１局部発振周波数信号を得る第１
のミキサと、相手局から、受信した高周波信号と
前記第１のミキサの第１局部発振周波数信号とを
混合して中間周波信号を得る第２のミキサとを備
えたことを特徴とする双方向FM無線通信機。 a first oscillator that obtains an oscillation output modulated by a transmission signal; a transmission circuit that multiplies the output of this oscillator and transmits the result; and a transmission circuit that obtains an oscillation output modulated by the transmission signal of the first oscillator and a first local oscillation frequency signal obtained by mixing the output of the second oscillator with the output of the second oscillator to obtain a first local oscillation frequency signal;
and a second mixer that mixes the high frequency signal received from the other station with the first local oscillation frequency signal of the first mixer to obtain an intermediate frequency signal. FM radio communication device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985069954U JPH0516748Y2 (en) | 1985-05-10 | 1985-05-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985069954U JPH0516748Y2 (en) | 1985-05-10 | 1985-05-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61187136U JPS61187136U (en) | 1986-11-21 |
| JPH0516748Y2 true JPH0516748Y2 (en) | 1993-05-06 |
Family
ID=30606117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985069954U Expired - Lifetime JPH0516748Y2 (en) | 1985-05-10 | 1985-05-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0516748Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161430A (en) * | 1979-06-04 | 1980-12-16 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicating system |
| JPS5795729A (en) * | 1980-11-26 | 1982-06-14 | Hitachi Denshi Ltd | Radio transmitter and receiver |
-
1985
- 1985-05-10 JP JP1985069954U patent/JPH0516748Y2/ja not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161430A (en) * | 1979-06-04 | 1980-12-16 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicating system |
| JPS5795729A (en) * | 1980-11-26 | 1982-06-14 | Hitachi Denshi Ltd | Radio transmitter and receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61187136U (en) | 1986-11-21 |
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