JPS61187430A - Interception preventing system - Google Patents
Interception preventing systemInfo
- Publication number
- JPS61187430A JPS61187430A JP60027093A JP2709385A JPS61187430A JP S61187430 A JPS61187430 A JP S61187430A JP 60027093 A JP60027093 A JP 60027093A JP 2709385 A JP2709385 A JP 2709385A JP S61187430 A JPS61187430 A JP S61187430A
- Authority
- JP
- Japan
- Prior art keywords
- line
- transmission
- information
- reception
- receiving device
- 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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複数の無線チャンネルを共用する、マルチ・
チャンネル・アクセス方式に関し、特に、市販のスキャ
ナー受信機にて盗聴されることを防護する盗聴防護方式
に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a multi-band wireless communication system that shares a plurality of wireless channels.
The present invention relates to a channel access method, and particularly to a wiretapping protection method for protecting against wiretapping using commercially available scanner receivers.
従来、この種のマルチ中チャンネル・アクセス方式にお
ける無線回線制御方式としては、多数チャンネルの場合
、周波数の有効利用上、制御用の専用チャンネルを設け
、通話チャンネルは、通話時電波送出方式を採用されて
いる（渡辺、高村著１移動通信方式”、科学新聞社、１
９７６年１月１０日発行、２４７ページ参照）。又、特
殊な例として、空チャンネルへ空線信号を送出する方法
もある。Conventionally, as a radio line control method for this type of multi-channel access method, in the case of multiple channels, a dedicated channel for control was provided in order to effectively use frequencies, and a method for transmitting radio waves during a call was adopted for the call channel. (Watanabe, Takamura, 1 Mobile Communication System”, Science Newspaper, 1
(Refer to page 247, published January 10, 1976). As a special example, there is also a method of sending an empty line signal to an empty channel.
上述した従来の通話時電波送出方式では、市販されてい
るスキャナー受信機（無線チャンネルを自動スキャンし
電波送出チャンネルで停止）にて、通話中のチャンネル
を容易に受信出来るため、簡単に盗聴されるという欠点
がある。又、例え空きチャンネルへ空線信号を送出する
方法でも、スキャナー受信機にて空きチャンネルである
ことが容易に分るという欠点がある。With the above-mentioned conventional radio wave transmission method during a call, a commercially available scanner receiver (which automatically scans wireless channels and stops at the radio wave transmission channel) can easily receive the channel during a call, making it easy to eavesdrop. There is a drawback. Furthermore, even if a method is used in which a blank line signal is sent to a vacant channel, there is a drawback that it is easy to see that the channel is vacant by a scanner receiver.
本発明による方式は、従来の上記のような欠点を解消す
るため、空きチャンネルへ見せかけ音（例えば、秘話が
かかっているような音や無意味な内容の音や時間ととも
に変化する音や多周波音等）を送信する。これによシ、
スキャナー受信機がそのチャンネルで停止すると、無意
味な内容の音としてしか聞えない。結果として、実際の
通話チャンネルを受信される確率が少なくなる。更に言
えば、本発明の盗聴防謹方式は、複数の無線チャンネル
を共有するマルチ・チャンネル・アクセス方式において
、基地局送受信装置の受信オフ情報或は交換機からの送
信オフ情報によシ、見せかけ音発生器を動作させて、空
きチャンネルへ見せかけ音を送信する。In order to eliminate the above-mentioned drawbacks of the conventional method, the method according to the present invention is capable of displacing spurious sounds (for example, sounds of secret conversations, sounds with meaningless contents, sounds that change over time, and multi-frequency sounds) into empty channels. The sound of waves, etc.) is transmitted. For this,
If the scanner receiver stops on that channel, all you hear is nonsense. As a result, the probability of receiving the actual communication channel decreases. Furthermore, the eavesdropping prevention method of the present invention prevents spurious sounds from being generated based on reception off information of a base station transmitting/receiving device or transmission off information from an exchange in a multi-channel access method that shares a plurality of wireless channels. Activate the generator and send a fake sound to an empty channel.
第１図は本発明の一実施例の構成図である。第１図にお
いて、１は複数の無線チャンネルの基地局送受信装置、
２は両方向（ボスウェイ）トランク、３は交換機であり
、一般にはボスウェイ・トランク２と交換機３は一緒に
して交換装置と呼ばれティる。４，７はリレー、５ ハ
ホカ−）’ （ＶＯＧＡＤ増幅器、６は中央処理装置（
ＣＰＵ）の制御の下に種々の音声成分を発生するみせか
け音発生器、８は送信オンオフライン、９は下シ方向（
交換装置より移動機）の音声ライン、１ｏはスケルチ信
号検出の受信オンオフライン、１１は空間電波、１２は
スキャナー受信機、そして１３は移動機である。FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a base station transmitting/receiving device for a plurality of wireless channels;
2 is a two-way (bossway) trunk, and 3 is a switch. Generally, the bossway trunk 2 and the switch 3 are collectively called a switching device. 4 and 7 are relays, 5 is a VOGAD amplifier, 6 is a central processing unit (
A pseudo sound generator that generates various audio components under the control of the CPU), 8 is a transmission on-off line, and 9 is a downward direction (
1o is a receiving on-off line for squelch signal detection, 11 is a spatial radio wave, 12 is a scanner receiver, and 13 is a mobile device.
次に動作忙ついて説明する。移動機１３が通話を完了す
ると、スケルチ信号検出の受信オンオフライン１０はオ
フとなり、すｖ −７（ＲＬ２ 、 ｒ１２ ）が動作
し、リレーの接点がとじられ、みせかけ音発生器６の信
号がボガード増幅器５．下り方向の音声ライン９．基地
局送受信装置ｌへ送られる。Next, I will explain about the operation. When the mobile device 13 completes the call, the reception on-line 10 for squelch signal detection is turned off, Sv-7 (RL2, r12) is activated, the relay contact is closed, and the signal from the pseudo sound generator 6 is turned off. Amplifier 5. Downward audio line 9. The signal is sent to the base station transceiver device l.
同時に送信オンオフ−）イン８がグランド電位となり、
基地局送受信装置１の送信機から、空きチャンネルへみ
せかけ音が空間電波１１として送出される。従って、仮
にスキャナー受信機で盗聴したとしても、無意味な内容
としてしか聞こえない。At the same time, transmission on/off -) In 8 becomes ground potential,
A pseudo sound is transmitted as a spatial radio wave 11 from a transmitter of a base station transmitting/receiving device 1 to an empty channel. Therefore, even if you were to eavesdrop on the information using a scanner receiver, you would only hear meaningless content.
なお、送信オンオフライン８の情報を利用して、みせか
け音発生器６を動作させる方法も容易に実現できる。又
、みせかけ音発生器６は、ＣＰＵを使用することにより
色々なみせかけ音を発生することも出来る。Note that it is also possible to easily implement a method of operating the pseudo sound generator 6 by using the information of the transmission on/off line 8. Furthermore, the pseudo sound generator 6 can also generate various pseudo sounds by using the CPU.
以上説明したように本発明は、空きチャンネルへ見せか
け音を送信することにより、スキャナー受信機がそのチ
ャンネルで停止し、無意味な見せかけ音として聞えると
ともに、実際の使用中の通話チャ／ネルを受信する確率
を少なくすることを特徴としており、簡単でかつ低コス
トで実現出来るので、本格的な秘話装置を入れるまでの
期間又はそれを入れない場合及び夜間等の空きチャンネ
ルの多い時、その効果は極めて大きい。As explained above, the present invention enables the scanner receiver to stop on that channel by transmitting a fake sound to an empty channel, so that the scanner receiver can hear it as a meaningless fake sound, and at the same time, it can receive the call channel/channel that is actually in use. The feature is that it reduces the probability that the communication will occur, and it can be realized easily and at low cost, so its effect is effective until the installation of a full-scale secret communication device or when it is not installed, or when there are many empty channels such as at night. Extremely large.
第１図は本発明の一実施例の構成図である。
１・・・・・・基地局送受信装置、２・・・・・・ボス
ウェイ・トランク、３・・・・・・交換機、４，７・・
・・・・リレー、８・−・・・・送信オンオフライン、
９・・・・・・下シ方向の音声ライン、１０・・・・・
・受信オンオフライン、１１・旧・・空間電波、１２・
・・・・・スキャナー受信機、１３・・・・・・移動機
。FIG. 1 is a block diagram of an embodiment of the present invention. 1... Base station transmitting/receiving device, 2... Bossway trunk, 3... Exchange, 4, 7...
...Relay, 8 ---... Transmission on-offline,
9...Audio line in the downward direction, 10...
・Reception on-offline, 11. Old... Spatial radio waves, 12.
...Scanner receiver, 13...Mobile device.
Claims (1)
アクセス方式の盗聴防護方式において、基地局送受信装
置の受信オフ情報或は交換機からの送信オフ情報に応答
して空きチャンネルへ見せかけ音を送信することを特徴
とする盗聴防護方式。Multi-channel communication that shares multiple wireless channels
A wiretapping protection method for an access method, characterized in that a pseudo sound is transmitted to an empty channel in response to reception off information from a base station transmitting/receiving device or transmission off information from an exchange.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60027093A JPS61187430A (en) | 1985-02-14 | 1985-02-14 | Interception preventing system |
| EP86101827A EP0191488B1 (en) | 1985-02-14 | 1986-02-13 | Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
| DE8686101827T DE3688530T2 (en) | 1985-02-14 | 1986-02-13 | DEVICE FOR AVOIDING HEARING OF A RADIO SIGNAL, WHICH IS TRANSMITTED BETWEEN A FIXED DEVICE AND A MOBILE STATION. |
| EP92100592A EP0481961B1 (en) | 1985-02-14 | 1986-02-13 | RF-communication system with a unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
| DE3650533T DE3650533T2 (en) | 1985-02-14 | 1986-02-13 | Radio transmission system with device for preventing eavesdropping on a radio transmission signal transmitted between a base station and a mobile station |
| US06/829,249 US4727568A (en) | 1985-02-14 | 1986-02-14 | Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
| AU53487/86A AU582329B2 (en) | 1985-02-14 | 1986-02-14 | Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
| CA000501874A CA1249031A (en) | 1985-02-14 | 1986-02-14 | Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
| CA000574155A CA1260066A (en) | 1985-02-14 | 1988-08-08 | Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60027093A JPS61187430A (en) | 1985-02-14 | 1985-02-14 | Interception preventing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61187430A true JPS61187430A (en) | 1986-08-21 |
Family
ID=12211462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60027093A Pending JPS61187430A (en) | 1985-02-14 | 1985-02-14 | Interception preventing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61187430A (en) |
-
1985
- 1985-02-14 JP JP60027093A patent/JPS61187430A/en active Pending
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