JPS63237618A - Radio equipment - Google Patents
Radio equipmentInfo
- Publication number
- JPS63237618A JPS63237618A JP62072820A JP7282087A JPS63237618A JP S63237618 A JPS63237618 A JP S63237618A JP 62072820 A JP62072820 A JP 62072820A JP 7282087 A JP7282087 A JP 7282087A JP S63237618 A JPS63237618 A JP S63237618A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- modulated
- local oscillator
- local oscillation
- 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
- 230000010355 oscillation Effects 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000005236 sound signal Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000009194 climbing Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Classifications
-
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
Description
【発明の詳細な説明】 く本発明の目的〉 ［産業上の利用分野］ 送受信同時通話方式の無線装置に関する。[Detailed description of the invention] Purpose of the present invention> [Industrial application field] The present invention relates to a wireless device that uses simultaneous transmission and reception.
［従来の技術Ｊ
自動車電話用の送受信同時通話方式の無線装置にはスー
パーヘテロダイン方式が用いられている。[Prior Art J] A superheterodyne system is used in a wireless device for a car telephone that uses a simultaneous transmission and reception system.
受信の場合、アンテナから入力した信号は第一周波数変
換部において、第１局部発振部からの信号との差または
和の周波数を出力し第一中間周波数に変換するが、第１
局部発振部の出力の一部を取り出して周波数変調又は位
相変調し、送信用にも利用していた。しかし、この方法
では周波数偏移が少なく十分な変調度を確保することが
出来なかった。In the case of reception, the signal input from the antenna is converted to a first intermediate frequency by outputting the difference or sum frequency of the signal from the first local oscillator in the first frequency converter.
A portion of the output from the local oscillator was extracted, frequency modulated or phase modulated, and used for transmission. However, with this method, it was not possible to ensure a sufficient degree of modulation due to the small frequency deviation.
第２図は、送受信同時通話方式の無線装置のブロックダ
イアグラムである。第１局部発振部と送信用の発振部を
別個；、こ設けたもので、発振部に直接変調をかけてか
ら送信するものであるから十分な変調をすることが出来
る。なお、第１局部発振部と発振部に接続されているコ
ントローラーはチャンネルを切り換えるためのものであ
る。しかじな清（こ −″小目−小島氾霧ｐル９伽油田
ナスールｈ１ニコスト高になり、また回路構成を複雑に
していた。FIG. 2 is a block diagram of a wireless device that uses simultaneous transmission and reception. The first local oscillation section and the oscillation section for transmission are provided separately, and since the oscillation section is directly modulated before transmission, sufficient modulation can be performed. Note that the first local oscillation section and the controller connected to the oscillation section are for switching channels. This made the cost high and the circuit configuration complicated.
［発明が解決しようさする問題点］
第１局部発振部を送信用と共用し、第１局部発振部に変
調をかけると、受信装置に変調信号が出力されてしまう
ため都合が悪い。そこで、第１局部発振部に変調をかけ
ても低周波出力に変調信号が出力されない工夫が必要で
ある。[Problems to be Solved by the Invention] If the first local oscillator is also used for transmission and modulation is applied to the first local oscillator, the modulated signal will be output to the receiver, which is inconvenient. Therefore, even if the first local oscillation section is modulated, it is necessary to devise a method that prevents the modulation signal from being output as a low frequency output.
［本発明の目的］
本発明は、回路を簡素化するとともに、送信用の発振周
波数に十分な変調をかけることを目的とする。[Object of the present invention] The present invention aims to simplify the circuit and apply sufficient modulation to the oscillation frequency for transmission.
く本発明の構成〉
［問題を解決する手段］
本発明では、送信用と受信用の発振器を兼用し、送信の
ため、の低周波信号を変調するが、この低周波信号が受
信装置の検波部から出力されない様にするため中間周波
数の段階で低周波信号を打ち消す必要がある。そこで、
第２局部発振部にも同様の低周波信号を変調して第２周
波数変換部において、互いの変調信号を逆位相にして打
ち消すことが出来る。[Configuration of the present invention] [Means for solving the problem] In the present invention, an oscillator is used for both transmission and reception, and a low frequency signal is modulated for transmission, but this low frequency signal is detected by a receiving device. It is necessary to cancel the low frequency signal at the intermediate frequency stage in order to prevent it from being output from the section. Therefore,
A similar low frequency signal is modulated in the second local oscillation section, and the modulated signals can be made to have opposite phases and cancel each other out in the second frequency conversion section.
［作用及び実施例］
第１図は、本発明の送受信同時通話方式の無線装置を示
すブロックダイヤグラムである。[Operations and Embodiments] FIG. 1 is a block diagram showing a wireless device of the present invention that uses a simultaneous transmission and reception method.
受信方式は、スーパーヘテロダイン方式である。The reception method is a superheterodyne method.
受信周波数と第１局部発振部とを第１周波数変換部で混
合し第一中間周波数を得る。第一中間周波数は、第１フ
イルター、第１増幅器を経て、第２周波数変換器で第２
局部発振部の周波数と混合し第二中間周波数に変換する
。第１局部発振部はＰＬＬ回路であり、ＶＣＯで変調す
る。第１局部発振部はチャンネルを切り換えるコントロ
ーラーがあり、分周信号を制御して必要な周波数が得ら
れる。一方、第２局部発振部は、水晶発振器であり直接
変調をかけている。そして、第１局部発振部で変調した
周波数を送信用の発振周波数とするが、ＶＣＯであり周
波数偏移を十分大きく取ることが可能で、変調度を深く
することができるものとなった。The received frequency and the first local oscillator are mixed in the first frequency converter to obtain the first intermediate frequency. The first intermediate frequency passes through a first filter, a first amplifier, and a second frequency converter.
It is mixed with the frequency of the local oscillator and converted to a second intermediate frequency. The first local oscillator is a PLL circuit and is modulated by a VCO. The first local oscillation section has a controller that switches channels, and controls the divided signal to obtain the required frequency. On the other hand, the second local oscillator is a crystal oscillator and directly modulates the signal. The frequency modulated by the first local oscillation section is used as the oscillation frequency for transmission, but since it is a VCO, it is possible to take a sufficiently large frequency shift and the degree of modulation can be made deep.
しかしながら、ＶＣＯに音声信号を変調入力として加え
たものであるから、音声信号が受信装置に漏洩して受信
出力まで到達し、受信信号を妨害する。However, since the audio signal is added to the VCO as a modulation input, the audio signal leaks to the receiving device and reaches the receiving output, interfering with the received signal.
そこで、第１局部発振部に変調をかけ、同じ信号で位相
の反転した信号を第２局部発振部に変調をかける。第１
局部発振部で変調された信号は、第１周波数変換部で周
波数変換され、受信信号とともに第一中間周波増幅部で
増幅され第２周波数変換部に入力する。第２周波数変換
部において、第２局部発振部からの位相の反転した変調
波とｉ＃合され、変調信号は、ここで打ち消されるが、
受信信号はそのまま周波数変換され第２中間周波増幅器
へ送られる。Therefore, modulation is applied to the first local oscillation section, and a signal whose phase is inverted using the same signal is modulated to the second local oscillation section. 1st
The signal modulated by the local oscillator is frequency-converted by the first frequency converter, amplified together with the received signal by the first intermediate frequency amplifier, and input to the second frequency converter. In the second frequency conversion section, the modulated wave whose phase is inverted from the second local oscillation section is combined with i#, and the modulated signal is canceled here.
The received signal is frequency-converted as it is and sent to the second intermediate frequency amplifier.
このように、第２周波数変換部で第１局部発振部と第２
局部発振部の変調信号が打ち消されるため、検波される
信号は受信信号のみであり、送信側の変調波の漏洩は抑
圧される。In this way, the second frequency conversion section connects the first local oscillation section and the second local oscillation section.
Since the modulated signal of the local oscillator is canceled, only the received signal is detected, and leakage of the modulated wave on the transmitting side is suppressed.
また、第１局部発振部と第２局部発振部にかける変調の
位相を反転しない方法として、第１局部発振部、、Ｌ−
笛２届部登擲部の周波数の御４つ方によっては変調信号
を位相反転させなくとも本発明を実施できる。In addition, as a method of not inverting the phase of the modulation applied to the first local oscillation section and the second local oscillation section, the first local oscillation section, L-
Depending on the frequency of the flute 2 reaching section and climbing section, the present invention can be carried out without inverting the phase of the modulated signal.
例えば、受信信号の周波数がｒｏで第１局部発振部の周
波数をｒ、として、第１周波数変換部でｆ、−ｆ、の周
波数を得る時、Ｌ＞ｆｏとし、第２局部発振部の周波数
ｆ２として第２周波数変換部でｆ、−ｆｏ−Ｆ２の周波
数を得る時（ｆｌ−ｆＯ）＞Ｆ２としたら、第１局部発
振部と第２局部発振部にかける変調信号は同相の信号で
あっても第２周波数変換部で、この変調信号を打ち消す
ことが出来る。For example, when the frequency of the received signal is ro and the frequency of the first local oscillator is r, and the first frequency converter obtains frequencies f, -f, then L>fo and the frequency of the second local oscillator is When the second frequency converter obtains the frequency f, -fo-F2 as f2, if (fl-fO)>F2, the modulation signals applied to the first local oscillator and the second local oscillator are in-phase signals. However, the second frequency converter can cancel this modulated signal.
また、同様にＬ＞ｆｏ、 Ｈ＋ −ｆｏ）＜Ｆ２であっ
て同相の信号でも本発明が実施できる。これは、ヘテロ
ダイン周波数の取り方によって変調信号が打ち消される
様に作用するからである。Similarly, the present invention can also be implemented with signals in the same phase where L>fo, H+ -fo)<F2. This is because the modulation signal acts to be canceled depending on how the heterodyne frequency is selected.
さらに、音声信号を第１局部発振部で変調し、受信信号
を経て検波出力と前記同じ音声信号の逆位相で打ち消す
方法が考えられるが、この方法では受信装置内を信号が
通過すると、フィルタを経てシ゛するため遅延歪みを生
じて検波出力で低周波信号を打ち消しても十分この低周
波信号がキャンセルできない。しかし、本発明によれば
中間周波数の段階で打ち消すため、まだこの段階ではあ
まり遅延歪みを生じていないため十分打ち消すことが出
来、受信信号のＳ／Ｎを劣化させることはない。Furthermore, a method can be considered in which the audio signal is modulated by the first local oscillator, and the detected output is canceled out by the opposite phase of the same audio signal after passing through the received signal, but in this method, when the signal passes through the receiver, the filter is removed. The low frequency signal cannot be canceled sufficiently even if the low frequency signal is canceled by the detection output. However, according to the present invention, since the delay distortion is canceled at the intermediate frequency stage, delay distortion has not yet occurred much at this stage, so it can be sufficiently canceled and the S/N of the received signal will not deteriorate.
く本発明の効果〉
本発明は、第１局部発振部を受信Ｉ１１と送信側の周波
数として共用させ、しかも第１局部発振部に音声信号等
低周波信号を直接変調したものであるから、送信用の周
波数偏移を大きくきることが出来て、変調を十分行うこ
とができた。また、同じ音声信号等低周波信号を第２局
部発振部に変調し、第２周波数変換部において、前記低
周波信号を打ち消すため送信の変調信号が受信への漏洩
を抑圧出来た。さらに、第１局部発振部を共用したもの
であるから、小型化を果たすことが出来るものとなり、
またコスト面でも有利なものとなった。Effects of the Invention> The present invention allows the first local oscillation section to be used as the frequency for both the reception I11 and the transmission side, and furthermore, the first local oscillation section is directly modulated with a low frequency signal such as an audio signal. We were able to greatly reduce the frequency deviation of the reliability, and were able to perform sufficient modulation. Furthermore, since the same low frequency signal such as an audio signal is modulated to the second local oscillation section and the low frequency signal is canceled in the second frequency conversion section, leakage of the modulated signal of the transmission to the reception can be suppressed. Furthermore, since the first local oscillator is shared, it can be made smaller.
It was also advantageous in terms of cost.
第１図は、本発明の無線装置の実施例を示すブロックダ
イヤグラム。第２図は、従来の無線装置のブロックダイ
ヤグラムである。FIG. 1 is a block diagram showing an embodiment of a wireless device of the present invention. FIG. 2 is a block diagram of a conventional wireless device.
Claims (2)
方式であり該受信装置の第１局部発振部を送信と受信に
兼用する無線装置において、該第１局部発振部で送信す
る低周波信号を変調し、該受信装置の第２周波数変換部
で該第１局部発振部で送信する低周波信号を変調した変
調波を打ち消すため、該受信装置の第２局部発振部で該
低周波信号を変調することを特徴とする無線装置。(1) In a radio device in which the receiving device of the simultaneous call system is of the superheterodyne method and the first local oscillation section of the receiving device is used for both transmission and reception, the low frequency signal to be transmitted by the first local oscillation section is modulated. , modulating the low frequency signal in a second local oscillator of the receiver in order to cancel a modulated wave obtained by modulating the low frequency signal transmitted by the first local oscillator in a second frequency converter of the receiver; A wireless device characterized by:
局部発振部で変調する低周波信号が逆位相であることを
特徴とする特許請求の範囲第１項記載の無線装置。(2) A low frequency signal modulated by the first local oscillator and a low frequency signal modulated by the second local oscillator.
2. The wireless device according to claim 1, wherein the low frequency signal modulated by the local oscillator has an opposite phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62072820A JPS63237618A (en) | 1987-03-25 | 1987-03-25 | Radio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62072820A JPS63237618A (en) | 1987-03-25 | 1987-03-25 | Radio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63237618A true JPS63237618A (en) | 1988-10-04 |
Family
ID=13500433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62072820A Pending JPS63237618A (en) | 1987-03-25 | 1987-03-25 | Radio equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63237618A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6046622A (en) * | 1983-08-24 | 1985-03-13 | Toyo Commun Equip Co Ltd | Simultaneous transmitting/receiving communication system using local oscillator of receiver also as channel oscillator of transmitter |
| JPS6268329A (en) * | 1985-09-20 | 1987-03-28 | Matsushita Electric Ind Co Ltd | Transmitter and receiver |
-
1987
- 1987-03-25 JP JP62072820A patent/JPS63237618A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6046622A (en) * | 1983-08-24 | 1985-03-13 | Toyo Commun Equip Co Ltd | Simultaneous transmitting/receiving communication system using local oscillator of receiver also as channel oscillator of transmitter |
| JPS6268329A (en) * | 1985-09-20 | 1987-03-28 | Matsushita Electric Ind Co Ltd | Transmitter and receiver |
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