JP4733665B2 - Radio signal notification device - Google Patents

Radio signal notification device Download PDF

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JP4733665B2
JP4733665B2 JP2007106859A JP2007106859A JP4733665B2 JP 4733665 B2 JP4733665 B2 JP 4733665B2 JP 2007106859 A JP2007106859 A JP 2007106859A JP 2007106859 A JP2007106859 A JP 2007106859A JP 4733665 B2 JP4733665 B2 JP 4733665B2
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尚樹 細川
和範 阿部
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株式会社ユピテル
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Description

本発明は、特定周波数帯域の電波を受信して目標電波の信号レベルが所定以上のときに報知信号を出力する電波信号報知装置に関するもので、より具体的には、受信した電波信号について真偽性の判定を行う判定動作の改良に関する。   The present invention relates to a radio signal notification device that receives radio waves in a specific frequency band and outputs a notification signal when a signal level of a target radio wave is equal to or higher than a predetermined level. The present invention relates to an improvement in determination operation for determining sex.

本発明の対象とする電波信号報知装置は、いわゆる無線受信機であって車両等へ装備し、特定周波数帯域の電波を受信して目標電波の信号レベルが所定以上のときに報知信号を出力するようになっている。これは180MHzから400MHz等の帯域における電波を受信するように構成し、これらの周波数はカーロケーターシステム,所轄系デジタル無線などに割り当てられている。   The radio signal notification device that is the subject of the present invention is a so-called radio receiver that is installed in a vehicle or the like, receives radio waves in a specific frequency band, and outputs a notification signal when the signal level of the target radio wave is equal to or higher than a predetermined level. It is like that. This is configured to receive radio waves in a band of 180 MHz to 400 MHz or the like, and these frequencies are assigned to a car locator system, a jurisdiction digital radio, and the like.

具体的には、カーロケーターシステム(カーロケ無線と呼ぶことにする)は、緊急車両の現在位置を動的に把握するためのシステムであり、これは移動する緊急車両から位置情報を407.725MHzの周波数によりデータ伝送し、それら位置情報データを受信した通信指令本部において地図画面上にリアルタイムで位置表示するようになっている。そこで、電波信号報知装置では、カーロケ無線の搬送波(407.725MHz)をモニタするので、そうした緊急車両が近辺に存在するか否かを検知することにより、緊急車両の走行の妨げにならないようにするなど、安全走行に役立てることができる。   Specifically, the car locator system (hereinafter referred to as “car location radio”) is a system for dynamically grasping the current position of an emergency vehicle. This is the position information from a moving emergency vehicle of 407.725 MHz. The data is transmitted by frequency, and the position is displayed on the map screen in real time at the communication command headquarters that receives the position information data. Therefore, since the radio signal notification apparatus monitors the carrier wave (407.725 MHz) of the car location radio, by detecting whether or not such an emergency vehicle exists in the vicinity, the emergency vehicle travel is not hindered. It can be used for safe driving.

電波信号報知装置において、受信部は図1に示すように、スーパーヘテロダイン方式を採用し、イメージ周波数を離すため周波数変換を2段階に行う構成にすることが多い。そして、受信部の初段には高周波増幅器は省略してバンドパスフィルタ(BPF)11,12を配設し、アンテナ10から受信した電波のうち、余分な信号をBPF11,12で減衰させて取り除く構成も採用が多い。   As shown in FIG. 1, in the radio signal notification apparatus, the receiving unit often employs a superheterodyne system and is configured to perform frequency conversion in two stages in order to separate the image frequency. In the first stage of the receiving unit, band-pass filters (BPF) 11 and 12 are provided without the high-frequency amplifier, and excess signals from the radio waves received from the antenna 10 are attenuated by the BPFs 11 and 12 and removed. Is also often adopted.

ところで、図1に示すような受信部では、回路は非直線性があるため出力信号は常に高調波,相互変調歪みおよびその他のスプリアス成分を含んでおり、性能低下の要因になっている。そこで、図1に示す受信部には、回路定数を最適化する等のチューニングを行うことにより、受信性能は実用十分なレベルを得ている。   By the way, in the receiving unit as shown in FIG. 1, since the circuit is non-linear, the output signal always includes harmonics, intermodulation distortion and other spurious components, which is a factor of performance degradation. Therefore, the receiving unit shown in FIG. 1 has a practically sufficient level of receiving performance by performing tuning such as optimizing circuit constants.

しかし、テレビ,ラジオ等の送信所の近辺では当該送信による電波が強電界となるため、受信部は混変調(相互変調),イメージ妨害,感度抑圧等による混信を受けてしまい、誤動作を引き起こす問題がある。特に、3次高調波積が何れの周波数に現れるかで違ってくるが、モニタ中の目標電波の受信であると誤検知してしまうことがある。これは図1に示す典型的なスーパーヘテロダイン方式の回路構成では選択度性能がほどほどであるため、送信所の近辺など強電界地域では避けられないが、受信障害は送信所を中心に比較的に狭い領域で生じ、走行中の車両が当該領域を通過することにより解消するため、改善要求はさほど高くはないという実状があった。   However, in the vicinity of transmitting stations such as televisions and radios, the radio waves generated by the transmissions become strong electric fields, so that the receiving unit receives interference due to cross modulation (intermodulation), image interference, sensitivity suppression, etc., causing malfunctions. There is. In particular, it may differ depending on the frequency at which the third harmonic product appears, but it may be erroneously detected as reception of the target radio wave being monitored. This is because the selectivity performance of the typical superheterodyne circuit configuration shown in FIG. 1 is moderate, and is unavoidable in strong electric field areas such as the vicinity of the transmitting station. There is a fact that the demand for improvement is not so high because it occurs in a narrow area and is resolved when a traveling vehicle passes through the area.

ところが近年は、よく知られるように、地上デジタル放送の本格化により全国各地で送信所の増設が進められている。このため、送信所数の増加に伴って全国各地で誤動作を起こす地点が増加してきており、改善要求が高まってきている。強電界の発生源は放送局の送信所には限らないが、いわゆる放送局では中継局や送信所は全国各地に多数開局していることから、路上を移動中に近辺を通過することになる機会が多くあり、各種の業務用無線局等に比べて送信出力が大きく、その影響が大きいと言える。   However, in recent years, as is well known, transmission stations have been expanded throughout the country due to the full-scale digital terrestrial broadcasting. For this reason, with the increase in the number of transmitting stations, the number of places where malfunctions occur in various parts of the country has increased, and the demand for improvement has increased. The source of the strong electric field is not limited to the transmitting station of the broadcasting station, but since so-called broadcasting stations have many relay stations and transmitting stations all over the country, they will pass nearby while moving on the road. There are many opportunities, and it can be said that the transmission output is large and the influence is large compared with various types of commercial radio stations.

地上デジタル放送は、473.142857MHz〜767.142867MHzまでを6MHzステップ毎に区切って13チャネル〜62チャネルとしており、送信出力は、デジタル波は伝播性がよいことからアナログ波の10分の1程度の低出力にでき、例えば出力10kW程度で送信するようになっている。ただし、送信出力は10kW程度であっても、近辺を通過する際は強大な電界であることは確かであり、受信部に干渉して受信障害を引き起こす。   Terrestrial digital broadcasting is divided into 13 channels to 62 channels from 473.142857 MHz to 767.142867 MHz every 6 MHz steps, and the transmission output is about one-tenth of analog waves because digital waves have good propagation characteristics. The output can be reduced, and for example, transmission is performed at an output of about 10 kW. However, even if the transmission output is about 10 kW, it is certain that the electric field is strong when passing in the vicinity, causing interference to the receiving unit and causing a reception failure.

そこで対策として、受信部の選択度を上げるため、初段のBPF11,12は遮断特性がシャープで減衰特性の高いものとし、目標電波の帯域以外を大きく減衰させて通過させない構成にする考えがある。しかし強電界地域では、電波は必ずしもアンテナ10から入力するとは限らず、回路の各部へ直接に飛び込んでくる高調波成分があるので、初段のBPF11,12をむやみと高性能にしても混信は防止できない。また、BPF11,12を遮断特性,減衰特性が良好なものとするにはコストが上がり、回路の各部へ直接に飛び込む高調波成分があることを考えると、効果的な対策とは言えない。   Therefore, as a countermeasure, in order to increase the selectivity of the receiving unit, there is an idea that the first-stage BPFs 11 and 12 have sharp cutoff characteristics and high attenuation characteristics, and are configured to greatly attenuate the band other than the target radio wave so as not to pass. However, in strong electric field areas, radio waves are not always input from the antenna 10, and there are harmonic components that jump directly into each part of the circuit. Can not. Further, considering that the BPFs 11 and 12 have good cutoff characteristics and attenuation characteristics, the cost increases, and considering that there are harmonic components that jump directly into each part of the circuit, this is not an effective measure.

したがって、地上デジタル放送の送信所の近辺では、図1に示す受信部の初段のバンドパスフィルタ(BPF)11,12では地上デジタル放送の電波を減衰させることができず、第1ミキサに取り込んでしまう。   Therefore, in the vicinity of the terrestrial digital broadcasting transmitting station, the first-stage bandpass filters (BPF) 11 and 12 of the receiving section shown in FIG. 1 cannot attenuate the terrestrial digital broadcasting radio waves, and take them into the first mixer. End up.

一方、図1に示す回路では目標電波を検知するため、所定周波数帯域について同調を自動的に走査する周波数スキャンを行っている。このため、局部発振器から所定周波数帯域の周波数信号を発振させてこれを第1ミキサへ送り込んで混合している。第1中間周波数は例えば20.8MHzに設定している。その出力はBPFにおいて第1IF周波数である20.8MHzを検出する。
a 175.1875〜191.5250MHz
b 214.2625〜224.0187MHz
c 350.3750〜383.0500MHz
d 428.5250〜448.0374MHz
On the other hand, in the circuit shown in FIG. 1, in order to detect a target radio wave, frequency scanning is performed to automatically scan tuning for a predetermined frequency band. For this reason, a frequency signal in a predetermined frequency band is oscillated from a local oscillator and sent to the first mixer for mixing. The first intermediate frequency is set to 20.8 MHz, for example. The output detects 20.8 MHz which is the first IF frequency in the BPF.
a 175.1875-191.5250MHz
b 214.26525-224.0187 MHz
c 30.3750-383.0500 MHz
d 428.5250-448.374 MHz

これらの周波数は複数の種類(カーロケ無線、所轄系デジタル無線など)の電波を受信するために用いられている。   These frequencies are used to receive a plurality of types of radio waves (such as car location radio and jurisdiction digital radio).

具体例として、目標電波がカーロケ無線であるときは、周波数は407.725MHzなので、局部発振器では第1IF周波数を加えた428.5250MHz(上記b内)を発振させることになる。これはVCO2の発振周波数214.2625MHzを2倍することにより得ている。しかしこのとき、局部発振器の出力には目的外の高調波が存在し、3次高調波は642.7875MHzとなり、第1ミキサでの混合において第1中間周波数20.8MHzが成り立つ周波数は663.5875MHzおよび621.9875MHzとなる。   As a specific example, when the target radio wave is a car location radio, the frequency is 407.725 MHz. Therefore, the local oscillator oscillates 428.5250 MHz (within the above b) including the first IF frequency. This is obtained by doubling the oscillation frequency 214.2625 MHz of VCO2. However, at this time, an undesired harmonic exists in the output of the local oscillator, the third harmonic becomes 642.7875 MHz, and the frequency at which the first intermediate frequency 20.8 MHz is established in the mixing by the first mixer is 663.5875 MHz. And 6211.9875 MHz.

これらの周波数は地上デジタル放送の周波数範囲に一致し、663.5875MHzは45チャネル、621.9875MHzは38チャネルの帯域内となり、送信所の近辺など、電波が強い強電界地域では受信してしまい、目標電波と区別がつかないという問題がある。   These frequencies correspond to the frequency range of terrestrial digital broadcasting, 663.5875 MHz is in the band of 45 channels, 621.9875 MHz is in the band of 38 channels, and received in strong electric field areas where radio waves are strong, such as near the transmitting station, There is a problem that it cannot be distinguished from the target radio wave.

この発明は上述した課題を解決するもので、その目的は、受信部の回路構成は従来と同様にコストを抑えた典型的な構成を採ることができ、送信所の近辺など強電界地域での誤動作を防止することができる電波信号報知装置を提供することにある。
The object of the present invention is to solve the above-described problems. The purpose of the circuit configuration of the receiving unit is to adopt a typical configuration in which the cost is reduced as in the conventional case, and in a strong electric field area such as the vicinity of the transmitting station. An object of the present invention is to provide a radio signal notification device capable of preventing malfunction.

上述した目的を達成するために、本発明に係る電波信号報知装置は、180MHzから400MHz等の帯域における電波を受信して目標電波の信号レベルが所定以上のときに報知信号を出力する電波信号報知装置であって、アンテナおよび電波受信のための受信部と、受信部に対して目標電波に応じた周波数を設定する周波数設定部と、受信部で受信した電波の信号レベルを検出する信号レベル検出部と、受信電波の信号レベルについて真偽性の判定を行うための演算を行う演算部とを備え、前記周波数設定部の指示により、前記目標電波の周波数と、前記目標電波に関連付けられて設定される判定周波数とを切り替えて受信を行い、前記判定周波数は、前記目標電波と近接している近隣チャンネル周波数、もしくは、前記目標電波の近辺でチャンネルの割り当てが存在しない周波数であり、前記演算部では、前記目標電波の信号レベルが所定以上であり、かつ、前記判定周波数での信号レベルが所定以下である場合に、受信検知ありの判定動作を行う構成にする(請求項1)。 In order to achieve the above-described object, the radio signal notification apparatus according to the present invention receives a radio wave in a band such as 180 MHz to 400 MHz and outputs a notification signal when the signal level of the target radio wave is equal to or higher than a predetermined level. A device for receiving an antenna and a radio wave, a frequency setting unit for setting a frequency corresponding to a target radio wave to the reception unit, and a signal level detection for detecting a signal level of the radio wave received by the reception unit And a calculation unit that performs a calculation for determining authenticity of the signal level of the received radio wave, and is set in association with the frequency of the target radio wave and the target radio wave according to an instruction from the frequency setting unit performs reception by switching a determining frequencies, the determination frequency, the target radio wave and proximity to and neighboring channel frequencies, or, the vicinity of the target radio wave A frequency at which the channel allocation does not exist, in the calculating unit, the target radio wave signal level is greater than or equal to a predetermined value, and, if the signal level at the determined frequency is below a predetermined, determined there reception detecting It is set as the structure which operates (Claim 1).

目標電波の有無を弁別する判断基準の“所定レベル”と、判定周波数の電波の有無を弁別する判断基準の“所定レベル”は、異ならせても良いし、同じでも良い。通常は、検出対象の真の目標電波よりも、誤判定を生じさせる要因となる判定周波数の電波の方が大きいので、判定周波数の信号レベルの“所定レベル”の閾値の方を高くすると良い。   The “predetermined level” of the determination criterion for discriminating the presence or absence of the target radio wave and the “predetermined level” of the determination criterion for discriminating the presence or absence of the radio wave of the determination frequency may be different or the same. Usually, since the radio wave of the determination frequency that causes an erroneous determination is larger than the true target radio wave to be detected, the threshold value of the “predetermined level” of the signal level of the determination frequency may be set higher.

目標電波と近接している近隣チャンネル周波数、もしくは、前記目標電波の近辺でチャンネルの割り当てが存在しない周波数、又は、局部発振周波数の高調波を意図的に生成し、当該高調波との混合により所定の中間周波数に変換される電波であって前記受信部に設けられた中間周波回路におけるバンドパスフィルタの通過帯域を通過しかつ前記中間周波回路におけるバンドパスフィルタの通過帯域の外側も通過する電波についてのその中間周波回路におけるバンドパスフィルタの通過帯域の外側の周波数の電波であって、所定レベルより大きなレベルの電波を受信した場合、検出対象の真の目標電波が存在していなくてもその受信した電波に起因して目標電波の周波数の信号が受信されることがある。そこで、目標電波の信号レベルが所定以上であり、かつ、判定周波数での信号レベルが所定以下である場合に、受信検知ありの判定動作を行うことで、上記のように判定周波数の電波に起因した目標電波の周波数範囲内の信号が検出されたとしても、真の目標電波を検出したと誤判定することがなくなる。 A harmonic of the neighboring channel frequency close to the target radio wave, a frequency where there is no channel assignment in the vicinity of the target radio wave, or a local oscillation frequency is intentionally generated, and predetermined by mixing with the harmonic. Radio waves that pass through the band-pass filter pass band in the intermediate frequency circuit provided in the receiver and pass outside the band-pass filter pass band in the intermediate frequency circuit If a radio wave having a frequency outside the pass band of the bandpass filter in the intermediate frequency circuit of the intermediate frequency circuit and having a level higher than a predetermined level is received, even if the true target radio wave to be detected does not exist The signal of the frequency of the target radio wave may be received due to the received radio wave. Therefore, when the signal level of the target radio wave is equal to or higher than the predetermined level and the signal level at the determination frequency is equal to or lower than the predetermined level, the determination operation with reception detection is performed, thereby causing the radio wave of the determination frequency as described above. Even if a signal within the frequency range of the target radio wave is detected, it is not erroneously determined that the true target radio wave has been detected.

警報判定は、所定レベル以上の目標電波が検出された場合に所定レベル以上の判定周波数が受信されているか否かの判断を行い最終的な受信検知の有無を判断するようにしても良いし、判定周波数を先に見て、それが所定レベル以上であれば目標電波を見ることなく警報しないようにしてもよいし、目標電波と判定周波数の電波の検知をそれぞれ独立して行ない、それぞれの検出結果に基づいて最終的な受信検知の有無を判断するようにしても良い。   The alarm determination may be performed by determining whether a determination frequency equal to or higher than a predetermined level is received when a target radio wave equal to or higher than a predetermined level is detected, and determining whether there is a final reception detection. Look at the judgment frequency first and if it is above a certain level, you may not be alerted without seeing the target radio wave, or you can detect the target radio wave and the radio wave of the judgment frequency independently, and detect each Based on the result, the presence or absence of final reception detection may be determined.

また、判定周波数は、目標電波の周波数に近接する周波数としても良いし、局部発振周波数の高調波成分により前記目標電波と同一の中間周波数を生じる周波数としてもよく、各種の設定が行なえる。すなわち、例えば目標電波や判定周波数や妨害電波の周波数を固定することに関する具体例を以下に説明する。まず、各条件を以下のようにする。
目標電波 消防無線:466.4125
妨害電波 携帯電話基地局:870.0250〜884.950MHz
IF周波数:20.8MHz
目標電波受信のための局部発振周波数:445.6125MHz
(222.80625MHz×2)
妨害電波を受信する判定周波数:870.425MHz
(222.80625MHz×4−20.8MHz)
Further, the determination frequency may be a frequency close to the frequency of the target radio wave, or may be a frequency that generates the same intermediate frequency as the target radio wave by a harmonic component of the local oscillation frequency , and various settings can be made. That is, for example, specific examples relating to fixing the target radio wave, the determination frequency, and the frequency of the jamming radio wave will be described below. First, each condition is as follows.
Target radio wave Fire fighting radio: 466.4125
Interfering radio wave mobile phone base station: 870.0250-884.950MHz
IF frequency: 20.8MHz
Local oscillation frequency for target radio wave reception: 445.6125 MHz
(222.80625MHz × 2)
Judgment frequency for receiving jamming radio waves: 870.425 MHz
(222.80625MHz × 4-20.8MHz)

上記の場合、目標電波を受信するための局部発振周波数の4逓倍の高調波は、携帯電話基地局の周波数範囲に含まれる。この場合に近接周波数を判定周波数として利用しても良いが4逓倍波は本来意図して生成しているものではないため発振レベル強度のばらつき等により、近接周波数の判定だけでは適切な判定ができない。このような場合には、4逓倍波を生成し、本来の携帯電話基地局本来の周波数を判定周波数として受信するようにすることで適切な判定が可能となる。   In the above case, the harmonic of 4 times the local oscillation frequency for receiving the target radio wave is included in the frequency range of the mobile phone base station. In this case, the proximity frequency may be used as the determination frequency, but since the quadruple wave is not originally generated intentionally, an appropriate determination cannot be made only by the determination of the proximity frequency due to variations in oscillation level intensity or the like. . In such a case, an appropriate determination can be made by generating a quadruple wave and receiving the original frequency of the original mobile phone base station as the determination frequency.

前記目標電波の周波数が、時間の経過に伴い変化するものであり、前記演算部では、前記目標電波の信号レベルが所定以上であり、前記判定周波数での信号レベルが所定以下の状態が連続した場合に、受信検知ありの判定動作を行うようにしても良い(請求項2)。 The frequency of the target radio wave changes with time. In the calculation unit, the signal level of the target radio wave is equal to or higher than a predetermined level, and the signal level at the determination frequency is continuously lower than the predetermined level. In this case, a determination operation with reception detection may be performed (claim 2).

目標電波に関連付けられて設定される判定周波数の受信は、設定された周波数単位(チャネル)毎の周波数スキャンにより行うようにしてもよい(請求項3)。 The determination frequency set in association with the target radio wave may be received by a frequency scan for each set frequency unit (channel ).

このようにすると、より確実に検出対象の目標電波を受信していないのに誤って受信したと誤判定をすることを抑制できる。すなわち、判定周波数の電波の周波数が変化するようなものの場合、一度判定周波数を受信しなかっただけでは時間軸で変化している周波数に対して対応できない。そこで、所定レベル以上の目標電波を受信し、かつ、判定周波数の受信を複数回行い、複数回に渡り判定周波数の信号レベルが所定以下の場合レベルの信号を受信しない場合に初めて受信したと判断するようにした。   In this way, it is possible to suppress erroneous determination that the target radio wave to be detected has been received erroneously even though it has not been received more reliably. That is, in the case where the frequency of the radio wave of the determination frequency is changed, it is not possible to cope with the frequency changing on the time axis only by not receiving the determination frequency once. Therefore, it is determined that the target radio wave is received for the first time when the target radio wave is received at a predetermined level or higher and the determination frequency is received a plurality of times, and the signal level of the determination frequency is not higher than the predetermined level for a plurality of times. I tried to do it.

本発明に係る電波信号報知装置では、目標電波の近辺の周波数等についても受信レベルを検査して所定以上である場合に、受信検知ありの判定を破棄する判定動作を行うので、現在の受信状態が他の強力な電波を受信している状態か否かを判断できる。つまり、目標電波の周波数帯の信号レベルが所定以上でも、近辺の周波数等でも所定以上の受信がある場合は、地上デジタル放送など他の強力な電波信号を受信していると考えてよく、そうした場合、受信検知ありの判定を破棄或いはそもそも判定をしないなどとすることで、送信所の近辺など強電界地域での誤動作を防止することができる。このとき、もちろん、受信部の回路構成は従来と同様にコストを抑えた典型的な構成を採ることができる。   In the radio signal notification device according to the present invention, when the reception level is also inspected for frequencies near the target radio wave and the like, the determination operation for discarding the determination with reception detection is performed, so the current reception state It is possible to determine whether or not is receiving another strong radio wave. In other words, even if the signal level of the target radio frequency band is higher than the specified level, or if the signal level is higher than the specified level at nearby frequencies, it may be considered that another strong radio signal such as terrestrial digital broadcasting is being received. In this case, it is possible to prevent a malfunction in a strong electric field region such as the vicinity of the transmitting station by discarding the determination with reception detection or not performing the determination in the first place. At this time, as a matter of course, the circuit configuration of the receiving unit can adopt a typical configuration with reduced cost as in the conventional case.

図2は本発明の好適な一実施の形態を示している。本実施形態において、電波信号報知装置は、受信部1,信号レベル検出部2,演算部3,報知部4,スキャン周波数設定部5,記憶部6などを備え、特定周波数帯域の電波を受信して目標電波の信号レベルが所定以上のときに報知信号を出力する構成になっている。受信モニタする帯域は180MHzから400MHz等の帯域としている。これらの周波数帯域は、カーロケーターシステム,所轄系デジタル無線などに割り当てられている。   FIG. 2 shows a preferred embodiment of the present invention. In this embodiment, the radio signal notification device includes a reception unit 1, a signal level detection unit 2, a calculation unit 3, a notification unit 4, a scan frequency setting unit 5, a storage unit 6, and the like, and receives radio waves in a specific frequency band. Thus, a notification signal is output when the signal level of the target radio wave is equal to or higher than a predetermined level. The band to be received and monitored is a band from 180 MHz to 400 MHz. These frequency bands are allocated to car locator systems, jurisdiction digital radio, and the like.

受信部1は、前述した図1に示すものと同一構成であり、2段階のスーパーヘテロダイン方式にしている。所轄系デジタル無線は、347.7125MHzから348.2125MHzおよび361.1から362.25MHzの周波数を12.5kHzステップ毎に区分して使用している。この場合、受信部1(図1に示す受信部)は、第1ミキサ13により第1中間周波数(20.8MHz)に周波数変換し、第2ミキサ14により第2中間周波数(450kHz)に周波数変換するが、第2ミキサ14に続くバンドパスフィルタ(BPF)15は450kHzを中心に通過帯域幅を±12.5kHzとしてあり、帯域制限により近隣チャネルの受信を阻止する構成になっている。   The receiving unit 1 has the same configuration as that shown in FIG. 1 described above, and has a two-stage superheterodyne system. The jurisdiction digital radio uses a frequency of 347.7125 MHz to 348.2125 MHz and 361.1 to 362.25 MHz for each 12.5 kHz step. In this case, the receiving unit 1 (the receiving unit shown in FIG. 1) performs frequency conversion to the first intermediate frequency (20.8 MHz) by the first mixer 13 and frequency conversion to the second intermediate frequency (450 kHz) by the second mixer 14. However, the band pass filter (BPF) 15 following the second mixer 14 has a pass band width of ± 12.5 kHz centered at 450 kHz, and is configured to block reception of neighboring channels by band limitation.

電波の受信には周波数スキャンを行っており、周波数の自動切り替えにより上述した特定周波数帯域をモニタしている。受信した電波信号は、信号レベル検出部2により信号レベルを検出し、演算部3において信号レベルを検査することにより、送信所の近辺など強電界地域での受信か否かを判定し、受信した電波信号について真偽性の判定を行うようになっている。   Frequency scanning is performed for radio wave reception, and the specific frequency band described above is monitored by automatic frequency switching. The received radio wave signal is detected by the signal level detection unit 2 and checked by the calculation unit 3 to determine whether or not the signal is received in a strong electric field area such as the vicinity of the transmitting station. The authenticity of the radio signal is determined.

周波数スキャンの動作では、図3に示すように、まず目標電波と接近している近隣チャネルをスキャン周波数設定部5から受信部1へ指示して受信し(S1)、信号レベル(RSSI電圧)の検査を行う(S2)。RSSI電圧は、受信した電波の信号レベルであり電界強度と考えてよい。ここで、近隣チャネルのRSSI電圧が、所定値を超えているときは近隣チャネルを「受信」と判定し(S3)、超えていなければ「非受信」と判定する(S4)。この近隣チャネルの判定状態を記憶部6へ記憶する。   In the frequency scan operation, as shown in FIG. 3, first, a nearby channel that is approaching the target radio wave is instructed from the scan frequency setting unit 5 to the reception unit 1 (S1), and the signal level (RSSI voltage) is received. An inspection is performed (S2). The RSSI voltage is a signal level of a received radio wave and may be considered as an electric field strength. Here, when the RSSI voltage of the neighboring channel exceeds a predetermined value, the neighboring channel is determined as “received” (S3), and when not exceeded, it is determined as “non-received” (S4). The determination state of this neighboring channel is stored in the storage unit 6.

次に、目標電波をスキャン周波数設定部5から受信部1へ指示して受信し(S5)、信号レベル(RSSI電圧)の検査を行う(S6)。ここで、目標電波のRSSI電圧が、所定値を超えているときは目標電波を「受信」と判定し(S7)、超えていなければ「非受信」と判定する(S8)。この目標電波の判定状態を記憶部6へ記憶する。   Next, the target radio wave is instructed from the scan frequency setting unit 5 to the receiving unit 1 and received (S5), and the signal level (RSSI voltage) is inspected (S6). Here, when the RSSI voltage of the target radio wave exceeds a predetermined value, the target radio wave is determined to be “received” (S7), and otherwise, it is determined to be “non-received” (S8). The determination state of the target radio wave is stored in the storage unit 6.

そして、近隣チャネルの判定状態と、目標電波の判定状態とを検査する(S9)。ここで、近隣チャネルが「非受信」であり、かつ目標電波が「受信」の場合は「真の受信」と判定し(S10)、報知信号を報知部4へ出力する(S11)。上記条件が成立しない場合は「偽の受信」と判定する(S12)。何れの場合もその後は、次の周波数スキャンのため処理ルーチンの先頭へ戻る。   Then, the determination state of the neighboring channel and the determination state of the target radio wave are inspected (S9). Here, when the neighboring channel is “non-reception” and the target radio wave is “reception”, it is determined as “true reception” (S10), and a notification signal is output to the notification unit 4 (S11). If the above condition is not satisfied, it is determined as “fake reception” (S12). In either case, after that, the process returns to the top of the processing routine for the next frequency scan.

つまり、上述した判定動作の実行において、図4(a)に示す信号レベルの状態は、近隣チャネルが「受信」で、目標電波が「受信」のとき、「偽の受信」と判定する。図4(b)に示す信号レベルの状態は、近隣チャネルが「受信」で、目標電波が「非受信」のとき、「偽の受信」と判定する。図4(c)に示す信号レベルの状態は、近隣チャネルが「非受信」で、目標電波が「受信」のとき、「真の受信」と判定する。図4(d)に示す信号レベルの状態は、近隣チャネルが「非受信」で、目標電波が「非受信」のとき、「偽の受信」と判定する。そして、「真の受信」では報知信号を報知部4へ出力し、「偽の受信」では何も実行しない。   That is, in the execution of the determination operation described above, the signal level state shown in FIG. 4A is determined as “false reception” when the neighboring channel is “reception” and the target radio wave is “reception”. The signal level state shown in FIG. 4B is determined as “false reception” when the neighboring channel is “reception” and the target radio wave is “non-reception”. The state of the signal level shown in FIG. 4C is determined as “true reception” when the neighboring channel is “non-reception” and the target radio wave is “reception”. The signal level state shown in FIG. 4D is determined as “false reception” when the neighboring channel is “non-reception” and the target radio wave is “non-reception”. In “true reception”, a notification signal is output to the notification unit 4, and in “false reception”, nothing is executed.

また、350.1MHzおよび407.725MHzなどは、単独に運用する周波数となっており、周波数の上側,下側の何れにも近辺にはチャネルの割り当てが存在しない運用形態となっている。目標電波が、そうした単独運用である場合は、目標電波よりも低い側にダミーチャネルを設定し、そのダミーチャネルをスキャン周波数設定部5へセットして周波数スキャンの動作を実行するようになっている。   In addition, 350.1 MHz and 407.725 MHz are frequencies that are operated independently, and have an operation mode in which there is no channel assignment near either the upper side or the lower side of the frequency. When the target radio wave is such a single operation, a dummy channel is set on the side lower than the target radio wave, and the dummy channel is set in the scan frequency setting unit 5 to execute the frequency scan operation. .

その場合は、判定動作の実行において、図5(a)に示す信号レベルの状態は、ダミーチャネルが「受信」で、目標電波が「受信」のとき、「偽の受信」と判定する。図5(b)に示す信号レベルの状態は、ダミーチャネルが「受信」で、目標電波が「非受信」のとき、「偽の受信」と判定する。図5(c)に示す信号レベルの状態は、ダミーチャネルが「非受信」で、目標電波が「受信」のとき、「真の受信」と判定する。図5(d)に示す信号レベルの状態は、ダミーチャネルが「非受信」で、目標電波が「非受信」のとき、「偽の受信」と判定する。そして、「真の受信」では報知信号を報知部4へ出力し、「偽の受信」では何も実行しない。   In that case, in the execution of the determination operation, the signal level state shown in FIG. 5A is determined as “false reception” when the dummy channel is “reception” and the target radio wave is “reception”. The signal level state shown in FIG. 5B is determined as “false reception” when the dummy channel is “reception” and the target radio wave is “non-reception”. The signal level state shown in FIG. 5C is determined as “true reception” when the dummy channel is “non-reception” and the target radio wave is “reception”. The signal level state shown in FIG. 5D is determined as “false reception” when the dummy channel is “non-reception” and the target radio wave is “non-reception”. In “true reception”, a notification signal is output to the notification unit 4, and in “false reception”, nothing is executed.

具体的に、目標電波がカーロケ無線(407.725MHz)である場合を例にして、ダミーチャネルを利用した受信における判定動作を説明する。カーロケ無線では、搬送波は407.725MHzであり、これには近隣に割り当てチャネルは存在せず、単独の周波数で運用している。そこで、目標電波の下側となる近辺にダミーチャネルを設定する。例えばダミーチャネルは周波数を407.750MHzとする。これは、目標電波(407.725MHz)に対して25kHzほど離れるようにした設定であり、上述した第2中間周波回路におけるBPF15での通過帯域(±12.5kHz)の外側となる設定にする必要がある。   Specifically, a determination operation in reception using a dummy channel will be described by taking as an example a case where the target radio wave is a car location radio (407.725 MHz). In the car location radio, the carrier wave is 407.725 MHz, and there is no assigned channel in the neighborhood, and the carrier is operated at a single frequency. Therefore, a dummy channel is set near the target radio wave. For example, the dummy channel has a frequency of 407.750 MHz. This is a setting that is about 25 kHz away from the target radio wave (407.725 MHz), and needs to be set outside the passband (± 12.5 kHz) at the BPF 15 in the second intermediate frequency circuit described above. There is.

周波数スキャンの動作は、図6に示すように、まず目標電波と接近しているダミーチャネル(407.750MHz)をスキャン周波数設定部5から受信部1へ指示して受信し(d1)、信号レベル(RSSI電圧)の検査を行う(d2)。ここで、ダミーチャネルのRSSI電圧(VLv)が、所定値(判定RSSI電圧)を超えているときはダミーチャネルを「受信」と判定し(d3)、超えていなければ「非受信」と判定する(d4)。このダミーチャネルの判定状態を記憶部6へ記憶する。判定RSSI電圧(407Vth)は469.13mVとしている。   As shown in FIG. 6, in the frequency scan operation, first, a dummy channel (407.750 MHz) approaching the target radio wave is instructed from the scan frequency setting unit 5 to the reception unit 1 and received (d1), and the signal level is received. (RSSI voltage) is inspected (d2). Here, when the RSSI voltage (VLv) of the dummy channel exceeds a predetermined value (determination RSSI voltage), the dummy channel is determined to be “received” (d3), and otherwise, determined to be “non-received”. (D4). The determination state of the dummy channel is stored in the storage unit 6. The determination RSSI voltage (407 Vth) is 469.13 mV.

次に、目標電波(407.725MHz)をスキャン周波数設定部5から受信部1へ指示して受信し(d5)、信号レベル(RSSI電圧)の検査を行う(d6)。ここで、目標電波のRSSI電圧(VLv)が、所定値(判定RSSI電圧)を超えているときは目標電波を「受信」と判定し(d7)、超えていなければ「非受信」と判定する(d8)。この目標電波の判定状態を記憶部6へ記憶する。   Next, the target radio wave (407.725 MHz) is received from the scan frequency setting unit 5 by instructing the receiving unit 1 (d5), and the signal level (RSSI voltage) is inspected (d6). Here, when the RSSI voltage (VLv) of the target radio wave exceeds a predetermined value (determination RSSI voltage), the target radio wave is determined to be “received” (d7), and otherwise, it is determined to be “non-received”. (D8). The determination state of the target radio wave is stored in the storage unit 6.

そして、ダミーチャネルの判定状態と、目標電波の判定状態とを検査する(d9)。ここで、ダミーチャネルが「非受信」であり、かつ目標電波が「受信」の場合は「真の受信」と判定し(d10)、報知信号を報知部4へ出力する(d11)。上記条件が成立しない場合は「偽の受信」と判定する(d12)。何れの場合もその後は、次の周波数スキャンのため処理ルーチンの先頭へ戻る。   Then, the determination state of the dummy channel and the determination state of the target radio wave are inspected (d9). Here, when the dummy channel is “non-reception” and the target radio wave is “reception”, it is determined as “true reception” (d10), and a notification signal is output to the notification unit 4 (d11). If the above condition is not satisfied, it is determined as “fake reception” (d12). In either case, after that, the process returns to the top of the processing routine for the next frequency scan.

つまり、上述した判定動作の実行において、図7(a)に示す信号レベルの状態は、ダミーチャネル407.750MHzが「受信」で、目標電波407.725MHzが「受信」のとき、「偽の受信」と判定する。図7(b)に示す信号レベルの状態は、ダミーチャネル407.750MHzが「受信」で、目標電波407.725MHzが「非受信」のとき、「偽の受信」と判定する。図7(c)に示す信号レベルの状態は、ダミーチャネル407.750MHzが「非受信」で、目標電波407.725MHzが「受信」のとき、「真の受信」と判定する。図7(d)に示す信号レベルの状態は、ダミーチャネル407.750MHzが「非受信」で、目標電波407.725MHzが「非受信」のとき、「偽の受信」と判定する。そして、「真の受信」では報知信号を報知部4へ出力し、「偽の受信」では何も実行しない。   That is, in the execution of the determination operation described above, the signal level state shown in FIG. 7A is “fake reception” when the dummy channel 407.750 MHz is “reception” and the target radio wave 407.725 MHz is “reception”. Is determined. The state of the signal level shown in FIG. 7B is determined as “false reception” when the dummy channel 407.750 MHz is “reception” and the target radio wave 407.725 MHz is “non-reception”. The signal level state shown in FIG. 7C is determined as “true reception” when the dummy channel 407.750 MHz is “non-reception” and the target radio wave 407.725 MHz is “reception”. The state of the signal level shown in FIG. 7D is determined as “false reception” when the dummy channel 407.750 MHz is “non-reception” and the target radio wave 407.725 MHz is “non-reception”. In “true reception”, a notification signal is output to the notification unit 4, and in “false reception”, nothing is executed.

すなわちこの場合、目標電波(407.725MHz)を真に受信した場合はダミーチャネルでは受信がないはずであり、ダミーチャネルでも所定以上の受信がある場合は、地上デジタル放送など他の強力な電波信号を受信していると考えてよい。つまり、地上デジタル放送は電波の帯域が6MHzあるので、これによる場合は、ダミーチャネルに対しても帯域が被さり受信が生じることになる。また、ダミーチャネルの信号レベルが小さい場合は、当該電波の受信が弱いので電波の発生源が遠距離にあると考えてよい。   That is, in this case, if the target radio wave (407.725 MHz) is truly received, the dummy channel should not receive. If the dummy channel receives more than a predetermined level, other powerful radio signals such as terrestrial digital broadcasts may be received. You may think that you are receiving. That is, terrestrial digital broadcasting has a radio wave band of 6 MHz. In this case, the dummy channel is also covered and reception occurs. Further, when the signal level of the dummy channel is low, it may be considered that the radio wave generation source is at a long distance because reception of the radio wave is weak.

このように、目標電波に接近した周波数(ダミーチャネル,近隣チャネル)に強力な電波が存在する状態は、強電界地域に位置している等の理由から電波受信があると考えてよく、このときは目標電波の信号レベルが所定以上であってもそれは「偽の受信」であると判定するので、送信所の近辺など強電界地域での誤動作を防止することができる。   In this way, when there is a strong radio wave at a frequency (dummy channel, neighboring channel) close to the target radio wave, it may be considered that there is radio wave reception because it is located in a strong electric field area, etc. Even if the signal level of the target radio wave is greater than or equal to a predetermined level, it is determined that it is “fake reception”, so that it is possible to prevent malfunction in a strong electric field area such as the vicinity of the transmitting station.

上記の実施形態では、周波数設定部としてVCOを用い、そのVCOにより局部発振周波数を切り替えるようにしたが、本発明はこれに限ることはなく、バンドパスフィルタを切り替えることにより、固定局部発振器を用いても対応することができる。すなわち、例えば、各周波数が以下に示すような例の場合、
目標受信周波数:407.725MHz(カーロケータ無線)
(210MHz×2−12.275MHz)
判定周波数:197.725MHz(VHF8ch音声周波数197.75MHz帯域内)
(210MHz×1−12.275MHz)
局部発振周波数:210.000MHz
IF周波数:12.275MHz

IF周波数を適宜設定するだけでカーロケ無線受信に影響する判定周波数にもVCOを用いず対応することが出来る。
In the above embodiment, the VCO is used as the frequency setting unit, and the local oscillation frequency is switched by the VCO. However, the present invention is not limited to this, and the fixed local oscillator is used by switching the bandpass filter. Can respond. That is, for example, in the case where each frequency is as shown below,
Target reception frequency: 407.725 MHz (Car Locator Radio)
(210MHz × 2-12.275MHz)
Judgment frequency: 197.725 MHz (VHF 8ch audio frequency within 197.75 MHz band)
(210MHz x 1-12.275MHz)
Local oscillation frequency: 210.000 MHz
IF frequency: 12.275MHz

By simply setting the IF frequency, it is possible to cope with the determination frequency that affects the radio reception of car location without using the VCO.

また、受信検知ありか否かの判定アルゴリズムを「目標電波の信号レベルが所定以上であり、判定周波数での信号レベルが少なくとも2回以上所定以下である場合に、受信検知ありとする」ようにすることができる。   In addition, the determination algorithm for determining whether or not there is reception detection is “reception detection is detected when the signal level of the target radio wave is equal to or higher than a predetermined value and the signal level at the determination frequency is equal to or lower than a predetermined value at least twice”. can do.

これは、例えば所轄系デジタル無線等の変調方式は位相変調であり位相が変わるということは周波数が変わるということと同義である。従って、これらの周波数を判定周波数として用いる場合、一度判定周波数を受信しなかっただけでは時間軸で変化している周波数に対して対応できない。これに対応するためには判定周波数の受信を複数回行うようにする。   This is, for example, that the modulation system of the jurisdiction digital radio or the like is phase modulation, and changing the phase is synonymous with changing the frequency. Therefore, when these frequencies are used as the determination frequencies, it is not possible to cope with the frequency changing on the time axis only by not receiving the determination frequency once. In order to cope with this, the determination frequency is received a plurality of times.

一例を示すと、図8の処理例(1)に示すように、目標電波を受信し、判定周波数である近辺周波数の電波を2回連続して受信しない(所定レベル以下)の場合に警報を発する。これに対し、処理例(2)の2番目のように、“近辺周波数の信号レベルが所定レベル以下”→“所定レベル以上の目標電波受信”となっても、そのまますぐに警報を発せずに次に“近辺周波数の信号レベルが所定レベル以下”か否かを判断し、ここで“近辺周波数の信号レベルが所定レベル以上”となると、“近辺周波数の信号レベルが所定レベル以下”は1回となるので、警報をしない(上述した実施携帯の装置では警報する)。もちん、3番目や4番目で示すパターンの場合では、当初から“近辺周波数の信号レベルが所定レベル以上”を受信しているため、上述した実施形態と同様に警報はしない。   As an example, as shown in the processing example (1) of FIG. 8, an alarm is generated when a target radio wave is received and a radio wave of a near frequency that is a determination frequency is not received twice consecutively (below a predetermined level). To emit. On the other hand, as in the second example of the processing example (2), even if “the signal level of the nearby frequency is below a predetermined level” → “target radio wave reception above the predetermined level”, the alarm is not immediately issued. Next, it is determined whether or not “the signal level of the near frequency is equal to or lower than a predetermined level”. When “the signal level of the near frequency is equal to or higher than the predetermined level”, “the signal level of the near frequency is equal to or lower than the predetermined level” is once. Therefore, no alarm is given (alarm is issued in the above-described portable device). Of course, in the case of the third and fourth patterns, since “the signal level of the near frequency is equal to or higher than the predetermined level” has been received from the beginning, no alarm is given as in the above-described embodiment.

受信部を示す構成図である。It is a block diagram which shows a receiving part. 本発明に係る電波信号報知装置の構成図である。It is a block diagram of the radio signal alerting | reporting apparatus which concerns on this invention. 目標電波の受信における判定動作のフローチャートである。It is a flowchart of the determination operation | movement in reception of a target electromagnetic wave. 近隣チャネルを利用した判定動作における信号レベルのグラフであり、(a)から(d)は受信状態が違う4つの例である。It is a graph of the signal level in the determination operation | movement using a neighboring channel, (a) to (d) is four examples from which a receiving state differs. ダミーチャネルを利用した判定動作における信号レベルのグラフであり、(a)から(d)は受信状態が違う4つの例である。It is a graph of the signal level in the determination operation | movement using a dummy channel, (a) to (d) is four examples from which a receiving state differs. 目標電波をカーロケ無線(407.725MHz)とした受信における判定動作のフローチャートである。It is a flowchart of the determination operation | movement in the reception which used the target radio wave as a car location radio (407.725 MHz). 図6の判定動作における信号レベルのグラフであり、(a)から(d)は受信状態が違う4つの例である。FIG. 7 is a graph of signal levels in the determination operation of FIG. 6, and (a) to (d) are four examples with different reception states. 別の実施形態の判定動作の機能を説明する図である。It is a figure explaining the function of determination operation of another embodiment.

符号の説明Explanation of symbols

1 受信部
2 信号レベル検出部
3 演算部
4 報知部
5 スキャン周波数設定部
6 記憶部
10 アンテナ
11,12,15 BPF
13 第1ミキサ
14 第2ミキサ
DESCRIPTION OF SYMBOLS 1 Reception part 2 Signal level detection part 3 Calculation part 4 Notification part 5 Scan frequency setting part 6 Storage part 10 Antenna 11, 12, 15 BPF
13 First mixer 14 Second mixer

Claims (3)

180MHzから400MHz等の特定周波数帯域における電波を受信して目標電波の信号レベルが所定以上のときに報知信号を出力する電波信号報知装置であって、
アンテナおよび電波受信のための受信部と、前記受信部に対して前記目標電波に応じた周波数を設定する周波数設定部と、前記受信部で受信した電波の信号レベルを検出する信号レベル検出部と、受信電波の信号レベルについて真偽性の判定を行うための演算を行う演算部とを備え、
前記周波数設定部の指示により、前記目標電波の周波数と、前記目標電波に関連付けられて設定される判定周波数とを切り替えて受信を行い、
前記判定周波数は、前記目標電波と近接している近隣チャンネル周波数、もしくは、前記目標電波の近辺でチャンネルの割り当てが存在しない周波数であり、
前記演算部では、前記目標電波の信号レベルが所定以上であり、かつ、前記判定周波数での信号レベルが所定以下である場合に、受信検知ありの判定動作を行うことを特徴とする電波信号報知装置。
A radio signal notification device that receives radio waves in a specific frequency band such as 180 MHz to 400 MHz and outputs a notification signal when a signal level of a target radio wave is equal to or higher than a predetermined level,
An antenna and a receiving unit for receiving radio waves; a frequency setting unit for setting a frequency corresponding to the target radio wave for the receiving unit; and a signal level detecting unit for detecting a signal level of radio waves received by the receiving unit; A calculation unit that performs a calculation for determining authenticity of the signal level of the received radio wave,
According to the instruction of the frequency setting unit, the frequency of the target radio wave and the determination frequency set in association with the target radio wave are switched and received,
The determination frequency is close to the channel frequency are close to the target radio wave, or a frequency assignment does not exist in the channel in the vicinity of the target radio wave,
The calculation section performs a determination operation with reception detection when a signal level of the target radio wave is equal to or higher than a predetermined level and a signal level at the determination frequency is equal to or lower than a predetermined level. apparatus.
前記目標電波の周波数が、時間の経過に伴い変化するものであり、
前記演算部では、前記目標電波の信号レベルが所定以上であり、前記判定周波数での信号レベルが所定以下の状態が連続した場合に、受信検知ありの判定動作を行うことを特徴とする請求項1に記載の電波信号報知装置。
The frequency of the target radio wave changes with the passage of time,
The operation unit performs a determination operation with reception detection when a signal level of the target radio wave is equal to or higher than a predetermined level and a signal level at the determination frequency is equal to or lower than a predetermined level. The radio wave signal notification device according to 1.
前記目標電波に関連付けられて設定される判定周波数の受信は、設定された周波数単位毎の周波数スキャンにより行うことを特徴とする請求項1あるいは請求項2に記載の電波信号検知装置。   The radio signal detection apparatus according to claim 1 or 2, wherein reception of a determination frequency set in association with the target radio wave is performed by a frequency scan for each set frequency unit.
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JP2000244421A (en) * 1999-02-23 2000-09-08 Matsushita Electric Ind Co Ltd Radio communication equipment, reception method for the same and recording medium
JP2003174373A (en) * 2001-09-26 2003-06-20 Sanyo Electric Co Ltd Equipment for detecting interference of signals in adjacent channels and method, and broadcast receiving equipment capable of using the method

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JP2000244421A (en) * 1999-02-23 2000-09-08 Matsushita Electric Ind Co Ltd Radio communication equipment, reception method for the same and recording medium
JP2003174373A (en) * 2001-09-26 2003-06-20 Sanyo Electric Co Ltd Equipment for detecting interference of signals in adjacent channels and method, and broadcast receiving equipment capable of using the method

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