JPH05129988A - Signal transmitter - Google Patents
Signal transmitterInfo
- Publication number
- JPH05129988A JPH05129988A JP31391691A JP31391691A JPH05129988A JP H05129988 A JPH05129988 A JP H05129988A JP 31391691 A JP31391691 A JP 31391691A JP 31391691 A JP31391691 A JP 31391691A JP H05129988 A JPH05129988 A JP H05129988A
- Authority
- JP
- Japan
- Prior art keywords
- attenuation
- circuit
- transmission
- frequency signal
- attenuation amount
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000008054 signal transmission Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は信号伝送装置に係り、と
くに減衰補正手段を備えた信号伝送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device, and more particularly to a signal transmission device equipped with attenuation correction means.
【０００２】[0002]
【従来の技術】従来、伝送距離の異なる複数の子装置に
対し、親装置から信号をケーブルで伝送する場合、各子
装置で補正すべき減衰量が異なるため、子装置にスイッ
チなどを設け人の手によって補正量の設定を行ってい
た。2. Description of the Related Art Conventionally, when a signal is transmitted from a parent device to a plurality of child devices having different transmission distances by a cable, the amount of attenuation to be corrected by each child device is different, so that a switch or the like is installed in the child device. The correction amount was set manually.
【０００３】[0003]
【発明が解決しようとする課題】この従来の方式では、
減衰量補正の設定を全子装置に対し手動で行わなければ
ならないという欠点がある。In this conventional method,
There is a drawback in that the setting of the attenuation correction must be manually performed for all child devices.
【０００４】[0004]
【発明の目的】本発明の目的は、かかる従来例の有する
不都合を改善し、特に子装置にて受信する伝送信号の減
衰量をその減衰量に応じて自動的に補正することを可能
とした信号伝送装置を提供することにある。SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the conventional example, and in particular, it is possible to automatically correct the attenuation amount of the transmission signal received by the slave device according to the attenuation amount. It is to provide a signal transmission device.
【０００５】[0005]
【課題を解決するための手段】本発明では、一の親装置
と、該親装置に対応して配設された伝送距離の異なるケ
ーブル伝送の複数の子装置とを備えている。そして、前
述した親装置に、周波数信号発生手段を装備すると共
に、各子装置に、周波数信号発生手段から出力され送ら
れてくる周波数信号の減衰量を測定する減衰量測定回路
と、この減衰量測定回路で測定された減衰量に応じて親
装置から送られてくる伝送信号の減衰量を補正するイコ
ライザ回路とを装備する、という構成を採っている。こ
れによって、前述した目的を達成しようとするものであ
る。According to the present invention, there is provided one parent device and a plurality of child devices for cable transmission having different transmission distances, which are arranged corresponding to the parent device. Further, the above-mentioned parent device is equipped with frequency signal generating means, and each child device is provided with an attenuation amount measuring circuit for measuring the attenuation amount of the frequency signal output from the frequency signal generating means and sent, and this attenuation amount. The configuration is such that it is equipped with an equalizer circuit that corrects the amount of attenuation of the transmission signal sent from the parent device according to the amount of attenuation measured by the measurement circuit. This aims to achieve the above-mentioned object.
【０００６】[0006]
【実施例】以下、本発明の一実施例を図１に基づいて説
明する。この図１に示す実施例は、一の親装置１と、該
親装置１に対応して配設された伝送距離の異なるケーブ
ル伝送の複数の子装置２とを備えている。親装置１に
は、周波数信号発生回路４が装備されている。また、各
子装置２には、周波数信号発生回路４から出力され送ら
れてくる周波数信号の減衰量を測定する減衰量判定回路
８と、この減衰量判定回路８で測定された減衰量に応じ
て親装置１から送られてくる伝送信号の減衰量を補正す
るイコライザ回路９が装備されている。ここで、符号
５，２５は親装置１の出力段に装備されたオペアンプを
示し、符号１５，３５は子装置２の入力段の装備された
オペアンプを示す。子装置２のオペアンプ１５と前述し
た減衰量判定回路８との間には、ピーク検出回路６，Ａ
／Ｄ変換回路７が順次装備されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The embodiment shown in FIG. 1 includes one master device 1 and a plurality of slave devices 2 for cable transmission having different transmission distances arranged corresponding to the master device 1. The parent device 1 is equipped with a frequency signal generation circuit 4. In addition, each child device 2 has an attenuation amount determination circuit 8 for measuring the attenuation amount of the frequency signal output from the frequency signal generation circuit 4 and an attenuation amount determination circuit 8 for measuring the attenuation amount. An equalizer circuit 9 that corrects the amount of attenuation of the transmission signal sent from the parent device 1 is provided. Here, reference numerals 5 and 25 denote operational amplifiers provided in the output stage of the parent device 1, and reference numerals 15 and 35 denote operational amplifiers provided in the input stage of the slave device 2. Between the operational amplifier 15 of the slave device 2 and the above-described attenuation amount determination circuit 8, the peak detection circuit 6, A
The / D conversion circuit 7 is sequentially installed.
【０００７】これを更に詳述すると、親装置１の周波数
発生回路４から出力される周波数は、実際に伝送する信
号の減衰量を判別するための基準となるものである。こ
こでは例として、伝送信号の最大周波数と同値の方形波
とする。この周波数の信号をオペアンプ５とケーブル３
によって子装置２に伝送し、伝送後のピーク値をピーク
検出回路６により検出し、Ａ／Ｄ変換をＡ／Ｄ変換回路
７により行う。ここでピーク値がデジタル値で求めら
れ、減衰量判定回路８で減衰量が求められる。この減衰
量からイコライザ回路９において、どの程度減衰量を補
正するかが判明し、イコライザ切り換え回路１０によっ
て補正量が自動的に変更される。実際に伝送したい信号
は、信号発生回路１１からオペアンプ５，ケーブル３を
通りイコライザ回路９において減衰量が補正され出力さ
れる（出力信号１２）。More specifically, the frequency output from the frequency generating circuit 4 of the parent device 1 serves as a reference for determining the amount of attenuation of the signal actually transmitted. Here, as an example, a square wave having the same value as the maximum frequency of the transmission signal is used. The signal of this frequency is connected to the operational amplifier 5 and the cable 3.
The peak value after transmission is detected by the peak detection circuit 6, and A / D conversion is performed by the A / D conversion circuit 7. Here, the peak value is obtained as a digital value, and the attenuation amount determination circuit 8 obtains the attenuation amount. From this attenuation amount, it becomes clear to what extent the attenuation amount is corrected in the equalizer circuit 9, and the correction amount is automatically changed by the equalizer switching circuit 10. A signal to be actually transmitted is output from the signal generation circuit 11 through the operational amplifier 5 and the cable 3 with the attenuation amount corrected in the equalizer circuit 9 (output signal 12).
【０００８】[0008]
【発明の効果】以上説明したように本発明によると、親
装置に基準周波数を発生させ、その信号を伝送し、減衰
量を判定し補正量を切り換えられるものとしたので、各
子装置で手動による減衰量の設定が不要となるという従
来にない優れた信号伝送装置を提供することができる。As described above, according to the present invention, the reference frequency is generated in the parent device, the signal is transmitted, the attenuation amount is judged, and the correction amount can be switched. It is possible to provide an unprecedented excellent signal transmission device in which the setting of the attenuation amount due to is unnecessary.
【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 an embodiment of the present invention.
１ 親装置 ２ 子装置 ３ ケーブル ４ 周波数発生回路 ８ 減衰量判定回路 ９ イコライザ回路 １１ 信号発生回路 １２ 出力信号 1 parent device 2 child device 3 cable 4 frequency generation circuit 8 attenuation determination circuit 9 equalizer circuit 11 signal generation circuit 12 output signal
Claims (1)
された伝送距離の異なるケーブル伝送の複数の子装置と
を有する信号伝送装置において、前記親装置に、周波数
信号発生手段を装備すると共に、前記各子装置に、前記
周波数信号発生手段から出力され送られてくる周波数信
号の減衰量を測定する減衰量判定回路と、この減衰量測
定回路で測定された減衰量に応じて前記親装置から送ら
れてくる伝送信号の減衰量を補正するイコライザ回路と
を装備したことを特徴とする信号伝送装置。1. A signal transmission device having one master device and a plurality of slave devices for cable transmission having different transmission distances arranged corresponding to the master device, wherein the master device is provided with frequency signal generating means. And an attenuation amount determination circuit for measuring the attenuation amount of the frequency signal output from the frequency signal generating means and sent to each of the child devices, and an attenuation amount measurement circuit for measuring the attenuation amount. And an equalizer circuit that corrects the amount of attenuation of the transmission signal sent from the parent device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31391691A JPH05129988A (en) | 1991-10-31 | 1991-10-31 | Signal transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31391691A JPH05129988A (en) | 1991-10-31 | 1991-10-31 | Signal transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05129988A true JPH05129988A (en) | 1993-05-25 |
Family
ID=18047068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31391691A Withdrawn JPH05129988A (en) | 1991-10-31 | 1991-10-31 | Signal transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05129988A (en) |
-
1991
- 1991-10-31 JP JP31391691A patent/JPH05129988A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990107 |