JP2000332635A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JP2000332635A JP2000332635A JP11174477A JP17447799A JP2000332635A JP 2000332635 A JP2000332635 A JP 2000332635A JP 11174477 A JP11174477 A JP 11174477A JP 17447799 A JP17447799 A JP 17447799A JP 2000332635 A JP2000332635 A JP 2000332635A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- speaker
- radio wave
- input terminal
- reception
- 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.)
- Granted
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、従来から幅広い範
囲に渡って電波を受信することが出来る受信機（通称広
帯域受信機またはスキャナ）、または同様の広帯域受信
機能を備えた通信機に関するものであり、特に盗聴器発
見機能に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver (commonly called a broadband receiver or scanner) capable of receiving radio waves over a wide range, or a communication device having a similar wideband reception function. Yes, especially related to the eavesdropping device discovery function.
【０００２】[0002]
【従来の技術】近年、広帯域受信機は、無数の外来電波
の中から必要とする周波数の電波を手軽に受信出来るこ
とからその需要が広がってきている。2. Description of the Related Art In recent years, the demand for wideband receivers has been increasing because radio waves of a required frequency can be easily received from countless external radio waves.
【０００３】また、一方では盗聴器によるプライバシー
の侵害が社会問題となるまでに拡大しており、盗聴器発
見のために上記広帯域受信機が使用される場合も多くな
っている。[0003] On the other hand, privacy infringement by wiretap has become a social problem, and the wideband receiver is often used for wiretap discovery.
【０００４】以下、図面を参照しながら、上述した従来
の受信機により盗聴器を発見する例について説明する。
図２は、従来の受信機の盗聴器発見機能のブロック図を
示すものである。Hereinafter, an example in which an eavesdropper is found by the above-mentioned conventional receiver will be described with reference to the drawings.
FIG. 2 is a block diagram of a conventional eavesdropping device detecting function of the receiver.
【０００５】図２において、５は受信アンテナで外来電
波を捕捉する。１は受信復調回路で上記受信アンテナ５
から入力された高周波信号を受信復調して可聴帯域の音
声周波数に変換する。２はスピーカで、上記受信復調回
路１の出力信号を音響に変換する。In FIG. 2, reference numeral 5 denotes a receiving antenna for capturing an external radio wave. 1 is a reception demodulation circuit,
Receiving and demodulating the high-frequency signal input from, and converting it to the audio frequency in the audible band. A speaker 2 converts an output signal of the reception demodulation circuit 1 into sound.
【０００６】３はＣＰＵで上記受信復調回路１の受信周
波数を設定し、又は変更する。上記ＣＰＵ３が特定の周
波数間隔で受信周波数を連続的に変化させることにより
幅広い範囲で信号の有無を判別できる。これがいわゆる
スキャン機能である。A CPU 3 sets or changes the reception frequency of the reception demodulation circuit 1. The presence or absence of a signal can be determined in a wide range by the CPU 3 continuously changing the reception frequency at specific frequency intervals. This is a so-called scan function.
【０００７】８は盗聴器で、６はマイクロホン、７は送
信アンテナである。盗聴器８は、マイクロホン６で周囲
の音声を捕捉し、その音声信号を変調して送信アンテナ
７から特定周波数の電波として送信するものである。Reference numeral 8 denotes a wiretap, 6 denotes a microphone, and 7 denotes a transmitting antenna. The eavesdropping device 8 captures the surrounding sound by the microphone 6, modulates the sound signal, and transmits the modulated sound signal from the transmission antenna 7 as a radio wave of a specific frequency.
【０００８】以上のように構成された受信機及び盗聴器
発見方法について、以下その動作について説明する。ま
ず、受信アンテナ５により無数の高周波信号が受信復調
回路１に入力される。受信復調回路１はＣＰＵ３により
設定された受信周波数で受信動作を行う。この場合、受
信復調回路１は設定された受信周波数での信号の有無を
ＣＰＵ３に伝達する。The operation of the receiver and the eavesdropping device discovery method configured as described above will be described below. First, countless high-frequency signals are input to the reception demodulation circuit 1 by the reception antenna 5. The reception demodulation circuit 1 performs a reception operation at the reception frequency set by the CPU 3. In this case, the reception demodulation circuit 1 informs the CPU 3 of the presence or absence of a signal at the set reception frequency.
【０００９】ＣＰＵ３は受信信号無しの場合は受信復調
回路１に別の周波数を設定する。また受信信号有りの場
合はスキャン動作を一時停止し、その周波数での受信動
作を継続する。このようにして、受信機は幅広い周波数
範囲に渡って外来電波の有無を判別することが出来るよ
うに機能する。The CPU 3 sets another frequency to the reception demodulation circuit 1 when there is no reception signal. If there is a received signal, the scanning operation is temporarily stopped, and the receiving operation at that frequency is continued. In this way, the receiver functions so as to be able to determine the presence or absence of an external radio wave over a wide frequency range.
【００１１】ここで、盗聴器８が作動中であるものと
し、送信アンテナ７より盗聴電波が発射されていれば、
上記した動作により、上記受信復調回路１の受信周波数
が盗聴器８の送信周波数に一致したとき盗聴電波を受信
し、盗聴器の存在を発見することが出来る。Here, it is assumed that the eavesdropping device 8 is operating, and if the eavesdropping radio wave is emitted from the transmission antenna 7,
According to the above-described operation, when the reception frequency of the reception demodulation circuit 1 matches the transmission frequency of the wiretap 8, the radio wave is received and the existence of the wiretap can be detected.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、受信アンテナ５が捕捉する電波は盗聴器
８の送信電波以外にも無数にあり、盗聴器８の送信電波
以外の電波でも受信復調回路１は信号を検出してしま
う。そのために、受信復調した信号が盗聴器によるもの
かそれ以外の外来電波によるものかの判別は、受信機の
使用者の聴感に頼らなければならず、自動的に盗聴器の
電波を判定することが出来ない。従って、盗聴器の発見
には専門的な特殊技能を必要とし、一般人では簡単に発
見できないという実状がある。そのために盗聴器による
プライバシーの侵害に脅え苦しんでいる被害者は、盗聴
器発見の専門家に盗聴器の発見を依頼し、高額の発見費
用を負担しなければならないという問題点を有してい
た。However, in the above configuration, the number of radio waves captured by the receiving antenna 5 is innumerable in addition to the radio waves transmitted by the wiretap 8, and the radio waves other than the radio waves transmitted by the wiretap 8 are received and demodulated. The circuit 1 detects a signal. To determine whether the received and demodulated signal is due to an eavesdropper or other external radio waves, it is necessary to rely on the hearing of the receiver user. Can not do. Therefore, the discovery of wiretapping devices requires specialized special skills, and there is a situation in which ordinary people cannot easily find them. For this reason, victims suffering from intrusion of privacy by eavesdropping devices had to ask a specialist for eavesdropping device discovery to find eavesdropping devices and have to pay a high discovery cost .
【００１３】本発明は上記問題点に鑑み、特定の低周波
信号をスピーカから音響として発信し、受信回路の復調
信号がスピーカから発信された信号と同じかどうかを判
定することにより、極めて簡単な回路構成で確実に盗聴
器の存在を検出することのできる受信機を提供するもの
である。In view of the above problems, the present invention transmits a specific low-frequency signal as sound from a speaker, and determines whether the demodulated signal of the receiving circuit is the same as the signal transmitted from the speaker. An object of the present invention is to provide a receiver capable of reliably detecting the presence of an eavesdropper with a circuit configuration.
【００１４】[0014]
【課題を解決するための手段】上記問題を解決するため
に本発明の受信機は、外来電波を受信して復調するため
の受信復調手段と、上記受信復調手段の受信周波数を自
動的に変化させる受信周波数スキャン手段と、特定の低
周波信号を発生させる信号発生手段と、上記信号発生手
段の出力信号を音響に変換するスピーカと、上記受信復
調手段の復調信号が上記スピーカから発生される音響信
号で変調された信号であることを判定する手段とを備え
たものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a receiver according to the present invention comprises a receiving / demodulating means for receiving and demodulating an external radio wave, and automatically changing a receiving frequency of the receiving / demodulating means. Receiving frequency scanning means, a signal generating means for generating a specific low-frequency signal, a speaker for converting an output signal of the signal generating means into sound, and a sound for generating a demodulated signal of the receiving and demodulating means from the speaker. Means for determining that the signal is a signal modulated by a signal.
【００１５】本発明は上記した構成によって、スピーカ
から特定の音響信号を発生させ、その音響信号を盗聴器
のマイクロホンが捕捉して盗聴電波が送信されるので、
受信復調信号がスピーカから発生される音響信号と同一
であれば盗聴器による電波と断定できる。従って、極め
て容易に盗聴器を発見できることとなる。According to the present invention, a specific acoustic signal is generated from the speaker by the above-described configuration, and the acoustic signal is captured by the microphone of the eavesdropper, and the eavesdropping radio wave is transmitted.
If the received demodulated signal is the same as the acoustic signal generated from the speaker, it can be determined that the radio wave is generated by the wiretap. Therefore, the wiretapping device can be found very easily.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照しながら詳細に説明する。図１において、
図２と同一番号を付したものは動作においてまったく同
一のため説明を省略する。Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG.
The components having the same reference numerals as those in FIG.
【００１７】図１において１０は信号発生器で、可聴周
波数の信号を発生しスピーカ２より音響信号を発生させ
る。９は判定器で、入力端子ａには受信復調回路１の受
信復調信号が入力され、また入力端子ｂには上記信号発
生器１０の発生信号が入力されている。判定機９は入力
端子ａ、ｂの信号を比較し等しいかどうかを判定し、等
しい場合には４のランプを点灯させる。入力端子ａの信
号が入力端子ｂの信号と同じかどうかを判定する手段と
しては、例えば次のような方法が実現可能である。ま
ず、両方の入力周波数をカウントして周波数を比較する
ことにより、入力端子ａの信号が入力端子ｂの信号と同
一かどうか判定できる。また、信号発生器１０の出力を
オンさせると入力端子ｂに信号が入力され、オフさせる
と入力端子ｂの信号が無くなる。このとき信号発生器の
オンオフに同期して、入力端子ｂに信号があるとき入力
端子ａにも信号があり、入力端子ｂに信号がないとき入
力端子ａにも信号がないとすると、この時の復調信号は
信号発生器１０から発生された信号が盗聴器により変調
された信号と断定できる。いずれの方法においても、受
信復調回路１の復調信号が信号発生器１０によって発生
されたものであるかを周知の技術により判定することが
できる。In FIG. 1, reference numeral 10 denotes a signal generator which generates a signal of an audible frequency and generates an acoustic signal from the speaker 2. Reference numeral 9 denotes a decision unit. An input terminal a receives a demodulated signal of the receiving / demodulating circuit 1, and an input terminal b receives a signal generated by the signal generator 10. The determinator 9 compares the signals of the input terminals a and b to determine whether or not they are equal. If they are equal, the lamp 4 is turned on. As means for determining whether the signal at the input terminal a is the same as the signal at the input terminal b, for example, the following method can be realized. First, it is possible to determine whether the signal at the input terminal a is the same as the signal at the input terminal b by counting both input frequencies and comparing the frequencies. When the output of the signal generator 10 is turned on, a signal is input to the input terminal b. When the output is turned off, the signal at the input terminal b is lost. At this time, in synchronization with the ON / OFF of the signal generator, if there is a signal at the input terminal a when there is a signal at the input terminal b, and there is no signal at the input terminal a when there is no signal at the input terminal b, then Can be determined to be a signal obtained by modulating the signal generated by the signal generator 10 by the wiretap. In either method, it is possible to determine whether the demodulated signal of the reception demodulation circuit 1 is generated by the signal generator 10 by a known technique.
【００１８】以上のように構成された受信機について、
以下図１を用いてその動作を説明する。受信復調回路１
が幅広い周波数範囲に渡って外来電波の有無を判別する
動作は前述した従来例の動作と全く同じである。With respect to the receiver configured as described above,
The operation will be described below with reference to FIG. Receive demodulation circuit 1
However, the operation of determining the presence or absence of an external radio wave over a wide frequency range is exactly the same as the operation of the above-described conventional example.
【００１９】次に、外来電波がある場合、その電波が近
くの盗聴器から発射されたものであるかどうかを判別す
る場合について、図１を用いてその動作を説明する。Next, the operation of a case where an external radio wave is present and whether the radio wave is emitted from a nearby eavesdropper will be described with reference to FIG.
【００２０】受信復調回路１が外来電波を受信した場
合、ＣＰＵ３は、信号発生器１０を駆動しスピーカ２か
ら特定の可聴周波数（ここでは仮に１ｋＨｚの信号とす
る）が音響信号となって発生する。次に、近くにある盗
聴器８は常に周囲の音声をマイクロホン６によって捕捉
し、その信号を変調して送信アンテナ７により空間へ電
波として発射している。従って、マイクロホン６の周囲
に１ｋＨｚの音響信号があれば、盗聴器８はこの１ｋＨ
ｚの信号を捕捉し、変調して送信する。When the receiving and demodulating circuit 1 receives an external radio wave, the CPU 3 drives the signal generator 10 to generate a specific audible frequency (here, a 1 kHz signal) as an acoustic signal from the speaker 2. . Next, the nearby eavesdropping device 8 always captures the surrounding sound by the microphone 6, modulates the signal, and emits the signal to the space by the transmitting antenna 7 as a radio wave. Therefore, if there is an acoustic signal of 1 kHz around the microphone 6, the eavesdropping device 8 will be
The signal of z is captured, modulated, and transmitted.
【００２１】盗聴器８の送信周波数は固定されているの
で、この周波数の電波を受信して復調すると、１ｋＨｚ
の信号が受信復調回路１より出力される。この信号は判
定器９の入力端子ａに入力される。判定機９の入力端子
ｂには同時に信号発生器１０の出力信号すなわち１ｋＨ
ｚの信号が入力されているので、判定機９は入力端子ａ
及びｂの周波数を比較し、同じであればランプ４が点灯
する。この場合、受信復調回路１の受信周波数は盗聴器
８の送信周波数であると断定できる。Since the transmission frequency of the wiretap 8 is fixed, if a radio wave of this frequency is received and demodulated, 1 kHz
Is output from the reception demodulation circuit 1. This signal is input to the input terminal a of the decision unit 9. At the same time, the output signal of the signal generator 10, that is, 1 kHz
Since the signal of z has been input, the judgment device 9 has the input terminal a
And the frequency of b is compared, and if they are the same, the lamp 4 is turned on. In this case, it can be determined that the reception frequency of the reception demodulation circuit 1 is the transmission frequency of the wiretap 8.
【００２２】また判定機９が、入力端子ａと入力端子ｂ
の信号の周波数が違うと判定した場合には、この時の受
信周波数は盗聴器８の送信周波数ではないということに
なり、ランプ４は点灯しない。従って、判定器９が入力
端子ａ及びｂの信号周波数を比較し、同一と判定してラ
ンプ４が点灯すればその時の受信電波は盗聴器８から発
射された電波であり、ランプ４が点灯しなければ盗聴器
以外の電波であるということが簡単に判別できることに
なる。Also, the judgment device 9 is configured to determine whether the input terminal a and the input terminal b
Is determined to be different, the reception frequency at this time is not the transmission frequency of the wiretap 8, and the lamp 4 is not turned on. Therefore, when the judging device 9 compares the signal frequencies of the input terminals a and b and judges that they are the same, and the lamp 4 is turned on, the received radio wave at that time is the radio wave emitted from the wiretap 8 and the lamp 4 is turned on. Otherwise, it can be easily determined that the radio wave is other than that of the wiretap.
【００２３】以上のように、外来電波を受信して復調す
るための受信復調手段と、上記受信復調手段の受信周波
数を自動的に変化させる受信周波数スキャン手段と、特
定の低周波信号を発生させる信号発生手段と、上記信号
発生手段の出力信号を音響に変換するスピーカと、上記
受信復調回路の復調信号が上記スピーカから発生される
音響信号で変調されたことを判定する手段とを備えるこ
とにより、一般の人でも極めて容易に、しかも確実に盗
聴器の存在を判別することが出来る。As described above, reception demodulation means for receiving and demodulating an external radio wave, reception frequency scanning means for automatically changing the reception frequency of the reception demodulation means, and generation of a specific low frequency signal A signal generation unit, a speaker that converts an output signal of the signal generation unit into sound, and a unit that determines that a demodulation signal of the reception demodulation circuit is modulated by an audio signal generated from the speaker. Even an ordinary person can very easily and surely determine the presence of an eavesdropper.
【００２４】なお、本発明の実施例では、判定器９及び
信号発生器１０をそれぞれ独立した機能を有する手段と
しているが、判定機能と信号発生機能を備えたＣＰＵを
用いても同様の効果を生じることは言うまでもない。ま
た、本発明の実施例では、判定器９は入力端子ａ及びｂ
の入力信号周波数を比較して同一信号か否かを判定して
いるが、信号発生器１０の信号をオンオフさせて入力端
子ａの信号の有無と入力端子ｂの信号の有無が同期して
いれば同一信号と判定するという方法でも同様の効果を
生じることは言うまでもない。In the embodiment of the present invention, the decision unit 9 and the signal generator 10 are means having independent functions. However, similar effects can be obtained by using a CPU having a decision function and a signal generation function. Needless to say. Further, in the embodiment of the present invention, the determiner 9 has the input terminals a and b.
Are compared to determine whether they are the same signal. However, if the signal of the signal generator 10 is turned on and off, the presence or absence of the signal at the input terminal a and the presence or absence of the signal at the input terminal b are synchronized. It goes without saying that the same effect is produced by the method of determining the same signal.
【発明の効果】以上のように本発明によれば、外来電波
を受信して復調するための受信復調手段と、上記受信復
調手段の受信周波数を自動的に変化させる受信周波数ス
キャン手段と、特定の信号を発生させる信号発生手段
と、上記信号発生手段の出力信号を音響に変換するスピ
ーカと、上記受信復調回路の復調信号が上記スピーカか
ら発生される音響信号で変調された信号であることを判
定する手段とを備えることにより、一般の人でも極めて
容易に確実に、しかも自動的に盗聴器の存在を判別でき
るので、盗聴器によるプライバシーの侵害、または盗聴
器で盗聴されているのではないかという不安に脅え苦し
むことなく、安心して日常生活を営むことが出来る。As described above, according to the present invention, a reception demodulation means for receiving and demodulating an external radio wave, a reception frequency scanning means for automatically changing the reception frequency of the reception demodulation means, Signal generating means for generating a signal of the type described above, a speaker for converting an output signal of the signal generating means into sound, and a demodulated signal of the receiving and demodulating circuit being a signal modulated by an acoustic signal generated from the speaker. By providing a means for determining, even an ordinary person can very easily and reliably determine the presence of an eavesdropper, so that privacy is not infringed by the eavesdropper or eavesdropping by the eavesdropper You can live your daily life with peace of mind without worrying about the anxiety.
【図１】本発明の実施例の受信機のブロック図である。FIG. 1 is a block diagram of a receiver according to an embodiment of the present invention.
【図２】従来の受信機のブロック図である。FIG. 2 is a block diagram of a conventional receiver.
１ 受信復調回路 ２ スピーカ ３ ＣＰＵ（受信周波数スキャン手段） ９ 判定器 １０ 信号発生器 DESCRIPTION OF SYMBOLS 1 Receiving demodulation circuit 2 Speaker 3 CPU (receiving frequency scanning means) 9 Judgment device 10 Signal generator
Claims (1)
復調手段（１）と、上記受信復調手段（１）の受信周波
数を自動的に変化させる受信周波数スキャン手段（３）
と、特定の低周波信号を発生させる信号発生手段（１
０）と、上記信号発生手段（１０）の出力信号を音響に
変換するスピーカ（２）と、上記受信復調手段（１）の
復調信号が上記スピーカ（２）から発生される音響信号
で変調された信号であることを判定する手段（９）とを
備えたことを特徴とする受信機。1. A reception demodulation means (1) for receiving and demodulating an external radio wave, and a reception frequency scanning means (3) for automatically changing a reception frequency of the reception demodulation means (1).
And signal generating means (1) for generating a specific low-frequency signal.
0), a speaker (2) for converting the output signal of the signal generating means (10) into sound, and a demodulated signal of the receiving and demodulating means (1) being modulated by an acoustic signal generated from the speaker (2). (9) for judging that the signal is a received signal.
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| JP17447799A JP4094773B2 (en) | 1999-05-18 | 1999-05-18 | Receiving machine |
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| Publication Number | Publication Date |
|---|---|
| JP2000332635A true JP2000332635A (en) | 2000-11-30 |
| JP4094773B2 JP4094773B2 (en) | 2008-06-04 |
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ID=15979176
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| JP17447799A Expired - Fee Related JP4094773B2 (en) | 1999-05-18 | 1999-05-18 | Receiving machine |
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| Country | Link |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008028931A (en) * | 2006-07-25 | 2008-02-07 | Secom Co Ltd | Surreptitious photographing detector |
| JP2008092453A (en) * | 2006-10-04 | 2008-04-17 | Secom Co Ltd | Surreptitious photographing detecting device |
| JP2008252535A (en) * | 2007-03-30 | 2008-10-16 | Rhythm Watch Co Ltd | Wiretap detector and clock |
| JP2008301296A (en) * | 2007-05-31 | 2008-12-11 | Icom Inc | Eavesdropping/surreptitious photographing device discovery apparatus, and eavesdropping/surreptitious photographing device discovery method |
| JP2009033347A (en) * | 2007-07-25 | 2009-02-12 | Rhythm Watch Co Ltd | Wiretap device detector and wiretap device detecting method |
| KR102437054B1 (en) * | 2022-03-18 | 2022-08-26 | (주)지슨 | Apparatus and method for detecting wiretapping device using automatic voice detection and frequency |
-
1999
- 1999-05-18 JP JP17447799A patent/JP4094773B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008028931A (en) * | 2006-07-25 | 2008-02-07 | Secom Co Ltd | Surreptitious photographing detector |
| JP4647557B2 (en) * | 2006-07-25 | 2011-03-09 | セコム株式会社 | Peeping detection device |
| JP2008092453A (en) * | 2006-10-04 | 2008-04-17 | Secom Co Ltd | Surreptitious photographing detecting device |
| JP4647570B2 (en) * | 2006-10-04 | 2011-03-09 | セコム株式会社 | Peeping detection device |
| JP2008252535A (en) * | 2007-03-30 | 2008-10-16 | Rhythm Watch Co Ltd | Wiretap detector and clock |
| JP2008301296A (en) * | 2007-05-31 | 2008-12-11 | Icom Inc | Eavesdropping/surreptitious photographing device discovery apparatus, and eavesdropping/surreptitious photographing device discovery method |
| JP2009033347A (en) * | 2007-07-25 | 2009-02-12 | Rhythm Watch Co Ltd | Wiretap device detector and wiretap device detecting method |
| KR102437054B1 (en) * | 2022-03-18 | 2022-08-26 | (주)지슨 | Apparatus and method for detecting wiretapping device using automatic voice detection and frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4094773B2 (en) | 2008-06-04 |
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