JPS6366460B2 - - Google Patents
Info
- Publication number
- JPS6366460B2 JPS6366460B2 JP55154263A JP15426380A JPS6366460B2 JP S6366460 B2 JPS6366460 B2 JP S6366460B2 JP 55154263 A JP55154263 A JP 55154263A JP 15426380 A JP15426380 A JP 15426380A JP S6366460 B2 JPS6366460 B2 JP S6366460B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- amplifier
- noise
- coils
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】
本発明は、電磁誘導方式によるワイヤレス伝送
装置のノイズ低減に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to noise reduction in a wireless transmission device using an electromagnetic induction method.
電磁誘導方式を利用した従来のワイヤレス機器
は、その手軽さと、実現の簡易さ、他の機器へ与
える影響の少なさなどのメリツトに反し、外来の
誘導ノイズに対する防禦策の困難さのために、多
岐に亘る実用化に大きな障害となつていた。 Conventional wireless devices that use electromagnetic induction methods have advantages such as simplicity, ease of implementation, and little impact on other devices, but they are difficult to protect against external induced noise. This has been a major obstacle to a wide range of practical applications.
本発明は外来のノイズを除去できるワイヤレス
伝送装置を提供するものであり、以下に本発明の
一実施例について第１図とともに説明する。 The present invention provides a wireless transmission device that can remove external noise, and one embodiment of the present invention will be described below with reference to FIG. 1.
第１図において、１は信号源、２は増幅器、
３，４は直交するように配置された送信用のコイ
ルであり、増幅器２の出力端子間にコイル３，４
が直列に接続されている。５，６は直交するよう
に配置された検出用のコイル、７，８はコイル
５，６に誘起された信号を増幅する増幅器であ
り、この増幅器７，８のゲインはそれぞれGx，
Gyである。９，１０は検出用のコイル５，６に
誘起されたノイズ成分を検出するバンドパスフイ
ルタであり、このバンドパスフイルタ９，１０の
出力がAGC電圧として増幅器７，８に印加され
るとともに、位相比較器１１に印加される。この
位相比較器１１の出力がスイツチング回路１２の
制御信号となり、位相比較器１１の出力に応じ、
増幅器７，８の出力が加算器１３で加算又は減算
されるものである。第２図に示すように、ノイズ
磁界をHrとし、直交するピツクアツプコイル５，
６が誘起する誘導起電力をeNx，eNyとすると
eNx＝kxHx＝kxHr・cosθ
eNy＝kyHy＝ky・Hr・sinθ
一方、これら直交する検出コイル５，６には、
それぞれに、リンクした送信コイル３，４からの
信号の誘導起電力ex，eyが重畳した出力が得られ
る。 In FIG. 1, 1 is a signal source, 2 is an amplifier,
3 and 4 are transmitting coils arranged orthogonally, and the coils 3 and 4 are arranged between the output terminals of the amplifier 2.
are connected in series. 5 and 6 are detection coils arranged orthogonally, and 7 and 8 are amplifiers that amplify the signals induced in the coils 5 and 6. The gains of the amplifiers 7 and 8 are G x and G x , respectively.
It is Gy . Reference numerals 9 and 10 indicate bandpass filters that detect noise components induced in the detection coils 5 and 6.The outputs of these bandpass filters 9 and 10 are applied as AGC voltages to amplifiers 7 and 8, and the phase applied to comparator 11. The output of this phase comparator 11 becomes a control signal for the switching circuit 12, and according to the output of the phase comparator 11,
The outputs of the amplifiers 7 and 8 are added or subtracted by an adder 13. As shown in Fig. 2, the noise magnetic field is Hr, and the pick-up coils 5,
Let the induced electromotive forces induced by _ _ _ _ _ In coils 5 and 6,
Outputs are obtained in which the induced electromotive forces e x and e y of the signals from the linked transmitting coils 3 and 4 are superimposed, respectively.
従つて、各々の検出コイル５，６の検出感度の
指向パターンは、第２図のイ，ロのように８字形
になる。 Therefore, the directivity pattern of the detection sensitivity of each of the detection coils 5 and 6 becomes a figure 8 shape as shown in A and B in FIG.
さて、双方の検出コイル５，６の出力を加える
か又は差引くかの操作をした場合、加算器１３の
出力端子に得られる出力Epは、
Ep＝Gx（ex＋eNx）±Gy（ey＋eNy）
＝（Gxex±Gy・ey）＋Hr（Gxkxcosθ±Gy・ky・
sinθ）
従つて、加算器１３の出力端子に得られるノイ
ズ成分eNTは、加算器１３の中の＋、−各々の入力
を増幅する増幅器の利得をアンプゲインAx，Ay
とすると、
eNT＝Ｋ・cos（θ−τ） τ＝tan-1（Ay／Ax）
となり、Ay／Ax＝tan（θ±π／２）に選ぶとeNT＝
Ｏとなつて、実質的に、ノイズ磁界Hrの方向θ
と、合成された検知コイルの指パターンの
NULLとを一致させることができるものである。 Now, when the outputs of both detection coils 5 and 6 are added or subtracted, the output E p obtained at the output terminal of the adder 13 is E p = G x ( ex + e Nx ) ± G y (e y +e Ny ) = (G x e x ±G y・e y ) + Hr (G x k x cosθ±G y・k y・
sinθ) Therefore, the noise component e NT obtained at the output terminal of the adder 13 is the amplifier gain A x , A y
Then, e NT = K・cos(θ−τ) τ=tan -1 (A y /A x ), and if we choose A y /A x = tan (θ±π/2), then e NT = O. In effect, the direction θ of the noise magnetic field Hr
and the finger pattern of the synthesized sensing coil.
It can match NULL.
第１図に示す本実施例では、各検知コイル出力
をノイズ成分によつてAGCをかける増巾器７，
８に入れる。一方、出力のノイズ成分について、
位相を比較する比較器１１を通し、同相の場合は
増巾器７，８の出力を各々差引き、逆相の場合は
加算する。加算器１３を同図の様に構成すること
によつて、系の出力Epは、ノイズ方向及び大きさ
が変化しても、常にこれをキヤンセルし、要望の
信号成分のみとなり、簡単に、有効にノイズリダ
クシヨンができるものである。 In this embodiment shown in FIG. 1, an amplifier 7, which applies AGC to each detection coil output using a noise component,
Put it in 8. On the other hand, regarding the noise component of the output,
Through a comparator 11 that compares the phases, the outputs of the amplifiers 7 and 8 are subtracted if they are in phase, and added if they are in opposite phases. By configuring the adder 13 as shown in the figure, even if the noise direction and magnitude change, the output E p of the system always cancels it and becomes only the desired signal component, making it easy to This allows effective noise reduction.
本発明は上記のような構成であり、本発明によ
れば、簡単な構成でノイズを有効に除去できる利
点を有するものである。 The present invention has the above-described configuration, and has the advantage that noise can be effectively removed with a simple configuration.
第１図は本発明の一実施例におけるワイヤレス
伝送装置のブロツク図、第２図は同装置の検出用
のコイルの感度指向性パターンを示す図である。
１……信号源、２……増幅器、３，４……送信
用コイル、５，６……検出用コイル、７，８……
増幅器、９，１０……バンドパスフイルタ、１１
……位相比較器、１２……スイツチング回路、１
３……加算器。
FIG. 1 is a block diagram of a wireless transmission device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a sensitivity directivity pattern of a detection coil of the same device. 1... Signal source, 2... Amplifier, 3, 4... Transmission coil, 5, 6... Detection coil, 7, 8...
Amplifier, 9, 10... Bandpass filter, 11
... Phase comparator, 12 ... Switching circuit, 1
3... Adder.
Claims (1)
コイルと電磁結合され、直交配置された検出用コ
イルと、前記各検出用コイルの出力を増幅する増
幅器と、この増幅器の出力中のノイズ成分を検出
するフイルタと、このフイルタの出力の位相を比
較する位相比較器とを有し、上記フイルタの出力
を上記増幅器のAGC電圧とするとともに、上記
位相比較器の出力に応じ上記増幅器の出力を加算
又は減算することを特徴とするワイヤレス伝送装
置。1. A transmitting coil arranged orthogonally, a detecting coil electromagnetically coupled to the transmitting coil and arranged orthogonally, an amplifier for amplifying the output of each of the detecting coils, and a noise component in the output of the amplifier. It has a filter to detect and a phase comparator to compare the phase of the output of this filter, and the output of the filter is used as the AGC voltage of the amplifier, and the output of the amplifier is added according to the output of the phase comparator. or subtraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55154263A JPS5778235A (en) | 1980-10-31 | 1980-10-31 | Wireless transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55154263A JPS5778235A (en) | 1980-10-31 | 1980-10-31 | Wireless transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5778235A JPS5778235A (en) | 1982-05-15 |
| JPS6366460B2 true JPS6366460B2 (en) | 1988-12-20 |
Family
ID=15580356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55154263A Granted JPS5778235A (en) | 1980-10-31 | 1980-10-31 | Wireless transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5778235A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH676178A5 (en) * | 1985-02-03 | 1990-12-14 | Svaetopluk Radakovic | Resonance circuit preventing attenuation of received signal |
| JP2769477B2 (en) * | 1990-06-29 | 1998-06-25 | 日本光電工業 株式会社 | Receiver for near-field communication |
-
1980
- 1980-10-31 JP JP55154263A patent/JPS5778235A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5778235A (en) | 1982-05-15 |
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