JP2001168753A - Receiver - Google Patents

Receiver

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Publication number
JP2001168753A
JP2001168753A JP34970199A JP34970199A JP2001168753A JP 2001168753 A JP2001168753 A JP 2001168753A JP 34970199 A JP34970199 A JP 34970199A JP 34970199 A JP34970199 A JP 34970199A JP 2001168753 A JP2001168753 A JP 2001168753A
Authority
JP
Japan
Prior art keywords
frequency
signal
reception
receiving
receiver
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
Application number
JP34970199A
Other languages
Japanese (ja)
Other versions
JP4249867B2 (en
Inventor
Akihisa Miyagawa
昭久 宮川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kokusai Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP34970199A priority Critical patent/JP4249867B2/en
Publication of JP2001168753A publication Critical patent/JP2001168753A/en
Application granted granted Critical
Publication of JP4249867B2 publication Critical patent/JP4249867B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Superheterodyne Receivers (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a receiver having excellent convenience which enables a user to check the reception by a receiver single body without using a measurement device or an opposite station or providing a measurement part in the receiver in adjustment. SOLUTION: In checking, a noise squelch circuit connected to a demodulator detects the presence/absence of radiated radio waves from demodulation output signals, a microcomputer controls a clock signal frequency so as to make the frequency of the radiated radio waves be in a reception frequency band and judges whether or not the output of the noise squelch circuit is in the reception frequency band and thus, the reception operation is checked.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、受信チェック機能
を有する受信機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 having a reception check function.

【0002】[0002]

【従来の技術】従来の一例である受信機について図2〜
4を参照して説明する。なお、この受信機について、そ
の詳細は特願平11−191684に示している。図2
は従来の受信機の構成を示すブロック図、図3は従来の
受信機のクロック発振器の構成の一例を示す回路図、図
4は従来の受信機のクロック発振器の構成の一例を示す
回路図である。
2. Description of the Related Art FIG.
This will be described with reference to FIG. The details of this receiver are shown in Japanese Patent Application No. 11-191684. FIG.
Is a block diagram showing a configuration of a conventional receiver, FIG. 3 is a circuit diagram showing an example of a configuration of a clock oscillator of the conventional receiver, and FIG. 4 is a circuit diagram showing an example of a configuration of a clock oscillator of the conventional receiver. is there.

【0003】従来の受信機の動作について説明する。ま
ず、受信機の動作の概略について図2を用いて説明す
る。アンテナ1にて受信した高周波信号はフロントエン
ド2にて帯域制限及び増幅され第一ミクサ3へ伝送され
る。第一ミクサ3では高周波信号の周波数が第一中間周
波数へ変換される。(第一中間周波数への周波数変換に
ついては後で詳細に説明する。)周波数変換後、高周波
信号は帯域濾波器4で帯域制限され、第一中間周波増幅
器5で増幅され、第二ミクサ6へ伝送される。第二ミク
サ6では高周波信号の周波数が更に第二中間周波数に変
換される。この周波数変換は、第一中間周波増幅器5か
ら伝送された高周波信号と第二局部発振器12から伝送
された発振信号が混合することにより行われる。周波数
変換後、高周波信号は帯域濾波器7で帯域制限され、第
二中間周波増幅器8で増幅され、復調器9で高周波信号
から音声信号が取り出される。この音声信号はベースバ
ンド信号処理回路10で帯域制限の処理が施され、スピ
ーカ11から出力される。
[0003] The operation of a conventional receiver will be described. First, an outline of the operation of the receiver will be described with reference to FIG. The high-frequency signal received by the antenna 1 is band-limited and amplified by the front end 2 and transmitted to the first mixer 3. In the first mixer 3, the frequency of the high-frequency signal is converted to a first intermediate frequency. (The frequency conversion to the first intermediate frequency will be described in detail later.) After the frequency conversion, the high-frequency signal is band-limited by the bandpass filter 4, amplified by the first intermediate-frequency amplifier 5, and sent to the second mixer 6. Transmitted. In the second mixer 6, the frequency of the high-frequency signal is further converted to a second intermediate frequency. This frequency conversion is performed by mixing the high-frequency signal transmitted from the first intermediate frequency amplifier 5 and the oscillation signal transmitted from the second local oscillator 12. After the frequency conversion, the high-frequency signal is band-limited by the band-pass filter 7, amplified by the second intermediate frequency amplifier 8, and an audio signal is extracted from the high-frequency signal by the demodulator 9. This audio signal is subjected to band limiting processing by the baseband signal processing circuit 10 and output from the speaker 11.

【0004】次に、高周波信号の周波数変換(第一中間
周波数への周波数変換)について、図2を用いて説明す
る。この周波数変換は、フロントエンド2から伝送され
た高周波信号と第一局部発振器13から伝送された発振
信号とが混合することにより行われる。この発振信号の
発振周波数は、マイコン14により所定の周波数に設定
されている。そして、このマイコン14はクロック発振
器15から出力されたクロック信号により動作する。
Next, frequency conversion of a high-frequency signal (frequency conversion to a first intermediate frequency) will be described with reference to FIG. This frequency conversion is performed by mixing a high-frequency signal transmitted from the front end 2 and an oscillation signal transmitted from the first local oscillator 13. The oscillation frequency of the oscillation signal is set to a predetermined frequency by the microcomputer 14. The microcomputer 14 operates according to the clock signal output from the clock oscillator 15.

【0005】次に、クロック発振器15の動作につい
て、図3、図4を用いて説明する。まず、図3に示すク
ロック発振器の動作について詳細に説明する。クロック
信号周波数は、水晶振動子16、コンデンサ17、18
によって決定される。このクロック信号周波数によりマ
イコン14及びベースバンド回路10の処理速度が決定
し、この周波数のときのクロック信号はベースバンド回
路10のMSK信号処理やCTCSS、CDCSS処理
などの原振になる。マイコン14やベースバンド処理回
路10の基板上のパターン、または素子からクロック信
号周波数の逓倍の周波数の電波が輻射される。この電波
の周波数が受信周波数の帯域幅内にあるとき、受信感度
が劣化する不具合をおこすことがある。次に、図4に示
すクロック発振器の動作について詳細に説明する。図4
に示すクロック発振器は、輻射された電波の周波数が受
信周波数の帯域幅内にあるとき、この電波の周波数が受
信周波数の帯域外となるようにマイコン14が制御する
ように構成している。クロック発振器15は、水晶振動
子16、コンデンサ17〜20、可変容量ダイオード2
1、22、抵抗23、24、マイコン14からの制御信
号線26、27を備えている。クロック信号周波数は水
晶振動子16の発振周波数、コンデンサ17〜20、可
変容量ダイオード21、22の電気容量により決定され
る。可変容量ダイオード21、22の電気容量はマイコ
ン14からの制御信号のレベルに応じて変化する。通常
マイコン14からの制御信号はLレベルであるが、クロ
ック信号周波数を変更するときはHレベルに変化する。
クロック発振器15からクロック信号が伝送されると、
マイコン14やベースバンド処理回路10では波形整
形、分周等の処理が施されるためにマイコン14、ベー
スバンド処理回路10の基板上のパターン、または素子
からクロック信号周波数の逓倍の周波数の電波が輻射さ
れる。この輻射電波の周波数が受信帯域内にあるか否か
をマイコン14により判定する。受信帯域内にあると判
定したときは、制御信号をHレベルにすることによりク
ロック信号周波数を変えることで輻射電波の周波数が受
信帯域外となるように変更する。
Next, the operation of the clock oscillator 15 will be described with reference to FIGS. First, the operation of the clock oscillator shown in FIG. 3 will be described in detail. The clock signal frequency is determined by the crystal oscillator 16, the capacitors 17, 18
Is determined by The processing speed of the microcomputer 14 and the baseband circuit 10 is determined by the clock signal frequency, and the clock signal at this frequency becomes the source of MSK signal processing, CTCSS, and CDCSS processing of the baseband circuit 10. A radio wave having a frequency that is a multiple of the clock signal frequency is radiated from a pattern or an element on the substrate of the microcomputer 14 or the baseband processing circuit 10. When the frequency of this radio wave is within the bandwidth of the reception frequency, a problem may occur that the reception sensitivity is deteriorated. Next, the operation of the clock oscillator shown in FIG. 4 will be described in detail. FIG.
Is configured such that when the frequency of the radiated radio wave is within the bandwidth of the reception frequency, the microcomputer 14 controls the frequency of the radio wave to be outside the band of the reception frequency. The clock oscillator 15 includes a crystal oscillator 16, capacitors 17 to 20, a variable capacitance diode 2
1, 22, resistors 23 and 24, and control signal lines 26 and 27 from the microcomputer 14. The clock signal frequency is determined by the oscillation frequency of the crystal unit 16 and the electric capacitance of the capacitors 17 to 20 and the variable capacitance diodes 21 and 22. The electric capacitance of the variable capacitance diodes 21 and 22 changes according to the level of a control signal from the microcomputer 14. Normally, the control signal from the microcomputer 14 is at L level, but changes to H level when the clock signal frequency is changed.
When a clock signal is transmitted from the clock oscillator 15,
Since the microcomputer 14 and the baseband processing circuit 10 perform processing such as waveform shaping and frequency division, radio waves having a frequency multiplied by the clock signal frequency are generated from a pattern or element on the substrate of the microcomputer 14 or the baseband processing circuit 10. Is radiated. The microcomputer 14 determines whether or not the frequency of the radiated radio wave is within the reception band. When it is determined that the frequency is within the reception band, the control signal is changed to the H level to change the clock signal frequency so that the frequency of the radiated radio wave is outside the reception band.

【0006】以上のように従来の受信機では、クロック
信号周波数の逓倍である輻射電波の周波数を受信周波数
の受信帯域幅の範囲外となるようにクロック信号周波数
を制御することにより受信感度の劣化を防止する。
As described above, in the conventional receiver, the reception sensitivity is degraded by controlling the clock signal frequency so that the frequency of the radiated radio wave which is a multiple of the clock signal frequency is out of the range of the reception bandwidth of the reception frequency. To prevent

【0007】[0007]

【発明が解決しようとする課題】前述の従来の受信機で
は受信感度の劣化を防止することができるが、受信動作
を点検するためには測定器や通話する相手局を要する
か、または単体で受信動作を点検するときには新たに測
定部を備えることが必要である。従って、測定器を用い
て点検したとき、通話する相手局を用いて点検したと
き、単体で点検したとき、それぞれ以下〜の欠点が
ある。
The above-mentioned conventional receiver can prevent the deterioration of the receiving sensitivity. However, in order to check the receiving operation, it is necessary to use a measuring instrument or a partner station for talking, or to use it alone. When checking the receiving operation, it is necessary to newly provide a measuring unit. Therefore, when the inspection is performed by using the measuring instrument, the inspection is performed by using the partner station of the call, and the inspection is performed by itself, there are the following disadvantages.

【0008】一般ユーザに対して測定器等の出費を強
いるため、高価となる。 受信機を通常動作で使用する前、または所定の時間に
受信動作を点検するとき、必ず相手局となる1つ以上の
送信機を用いて確認しなければならないため、面倒であ
る。 新たに測定部を備えることが必要であるため、小型化
・軽量化に不利であると共に高価になる。 例えば防災無線システム等、通信の確実性(確実に受信
できるか否か)が人命に関わるようなとき、通信前に受
信機を点検を行うことが必要である。この受信機が携帯
用であるとき、新たに測定部を備えることは小型化・軽
量化することに相反することである。
[0008] Since the expenditure of a measuring instrument or the like is imposed on a general user, it becomes expensive. Before using the receiver in normal operation, or when checking the reception operation at a predetermined time, it is necessary to check the reception operation using one or more transmitters, which are partner stations, which is troublesome. Since it is necessary to newly provide a measuring unit, it is disadvantageous for miniaturization and weight reduction and is expensive. For example, when the reliability of communication (whether or not reliable reception is possible) affects human life, such as in a disaster prevention wireless system, it is necessary to check the receiver before communication. When this receiver is portable, the provision of a new measuring unit is incompatible with miniaturization and weight reduction.

【0009】そこで本発明では上記〜の欠点を鑑
み、点検時において、測定器、相手局を用いたり、また
新たに測定部を備えたりすることなしに単体で受信動作
を点検できるようにした極めて利便性の良い受信機を提
供することを目的とする。
In view of the above-mentioned drawbacks, the present invention makes it possible to inspect the reception operation by itself without using a measuring instrument and a counterpart station or newly providing a measuring unit at the time of inspection. An object is to provide a convenient receiver.

【0010】[0010]

【課題を解決するための手段】本発明は上記の目的を達
成するために、復調手段に接続され点検時において復調
出力信号の中から輻射電波の有無を検出する検出手段を
備え、制御手段は輻射電波の周波数が受信周波数帯域内
となるようにクロック信号周波数を制御し検出手段の出
力が受信周波数帯域内であると判定する手段にする。そ
して、クロック信号周波数を制御することにより輻射電
波が受信周波数帯域内となるようにしたとき、輻射電波
を受信できるか否かに応じて受信動作が行えるかを判定
するようにしたものである。
In order to achieve the above object, the present invention comprises detection means connected to demodulation means for detecting the presence or absence of a radiated radio wave from a demodulated output signal at the time of inspection. The clock signal frequency is controlled so that the frequency of the radiated radio wave is within the reception frequency band, and the output of the detection unit is determined to be within the reception frequency band. Then, when the radiated radio wave is controlled to be within the reception frequency band by controlling the clock signal frequency, it is determined whether or not the receiving operation can be performed depending on whether or not the radiated radio wave can be received.

【0011】または、受信部に接続され輻射電波の周波
数が受信周波数帯域内となるように受信周波数を設定す
る操作手段と、復調手段に接続され点検時において復調
出力信号の中から輻射電波の有無を検出する検出手段と
を備え、制御手段は検出手段の出力が受信周波数帯域内
であるかを判定する手段にする。そして、受信周波数を
調整することにより輻射電波が受信周波数帯域内となる
ようにしたとき、輻射電波を受信できるか否かに応じて
受信動作を行えるかを判定するようにしたものである。
Alternatively, an operating means connected to the receiving section for setting the receiving frequency so that the frequency of the radiated radio wave is within the receiving frequency band, and presence / absence of the radiated radio wave from the demodulated output signal at the time of inspection connected to the demodulating means. And control means for determining whether the output of the detection means is within the reception frequency band. Then, when the reception frequency is adjusted so that the radiated radio wave falls within the reception frequency band, it is determined whether or not the reception operation can be performed depending on whether or not the radiated radio wave can be received.

【0012】[0012]

【発明の実施の形態】本発明の一実施例である受信機を
図1、4を参照して説明する。図1は本実施例の受信機
の構成を示すブロック図である。図4は本実施例の受信
機のクロック発振器の構成を示す回路図である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS A receiver according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the receiver of this embodiment. FIG. 4 is a circuit diagram showing the configuration of the clock oscillator of the receiver according to the present embodiment.

【0013】まず、受信機の動作の概略について図1を
用いて説明する。アンテナ1で受信した高周波信号はフ
ロントエンド2で帯域制限又は増幅され第一ミクサ3へ
伝送される。第一ミクサ3では高周波信号の周波数が第
一中間周波数へ変換される。(第一中間周波数への周波
数変換については後で詳細に説明する。)周波数変換
後、高周波信号は帯域濾波器4で帯域制限され、第一中
間周波増幅器5で増幅され、第二ミクサ6へ伝送され
る。第二ミクサ6では高周波信号の周波数が更に第二中
間周波数に変換される。この周波数変換は、第一中間周
波増幅器5から伝送された高周波信号と第二局部発振器
12から伝送された発振信号が混合することにより行わ
れる。周波数変換後、高周波信号は帯域濾波器7で帯域
制限され、第二中間周波増幅器8で増幅され、復調器9
で高周波信号から音声信号が取り出される。通常の受信
動作を行うとき、音声信号はベースバンド信号処理回路
10で帯域制限の処理が施され、スピーカ11から出力
される。このとき、アンテナから受信した高周波信号に
はマイコン14(本実施例の制御手段である。)からの
ノイズ(輻射電波により発生するノイズ)を含まないよ
うにクロック発振器15から出力するクロック周波数を
制御する。(マイコン14、クロック発振器15の動作
については後で詳細に説明する。) 一方、受信動作を点検するとき、アンテナから受信した
高周波信号にはマイコン14からのノイズ(輻射電波に
より発生するノイズ)を含むようにクロック発振器15
から出力するクロック周波数を制御する。(マイコン1
4、クロック発振器15の動作については後で詳細に説
明する。)そして、輻射電波により発生するノイズを含
んでいるかをノイズスケルチ回路25(本実施例の検出
手段である。)で検出し、マイコン14で判定する。ノ
イズスケルチ回路25で輻射電波により発生するノイズ
を検出したとき、マイコン14は受信動作が行えると判
定する。
First, an outline of the operation of the receiver will be described with reference to FIG. The high frequency signal received by the antenna 1 is band-limited or amplified by the front end 2 and transmitted to the first mixer 3. In the first mixer 3, the frequency of the high-frequency signal is converted to a first intermediate frequency. (The frequency conversion to the first intermediate frequency will be described in detail later.) After the frequency conversion, the high-frequency signal is band-limited by the bandpass filter 4, amplified by the first intermediate-frequency amplifier 5, and sent to the second mixer 6. Transmitted. In the second mixer 6, the frequency of the high-frequency signal is further converted to a second intermediate frequency. This frequency conversion is performed by mixing the high-frequency signal transmitted from the first intermediate frequency amplifier 5 and the oscillation signal transmitted from the second local oscillator 12. After the frequency conversion, the high-frequency signal is band-limited by the band-pass filter 7, amplified by the second intermediate frequency amplifier 8, and demodulated by the demodulator 9.
Then, an audio signal is extracted from the high-frequency signal. When a normal receiving operation is performed, the audio signal is subjected to band limiting processing in the baseband signal processing circuit 10 and output from the speaker 11. At this time, the clock frequency output from the clock oscillator 15 is controlled so that the high-frequency signal received from the antenna does not include noise (noise generated by radiated radio waves) from the microcomputer 14 (which is the control means of the present embodiment). I do. (The operations of the microcomputer 14 and the clock oscillator 15 will be described later in detail.) On the other hand, when checking the receiving operation, the high-frequency signal received from the antenna includes noise from the microcomputer 14 (noise generated by radiated radio waves). Clock oscillator 15 to include
Controls the clock frequency output from. (Microcomputer 1
4. The operation of the clock oscillator 15 will be described later in detail. Then, the noise squelch circuit 25 (which is the detecting means of the present embodiment) detects whether or not noise generated by the radiated radio wave is included, and the microcomputer 14 determines. When the noise generated by the radiated radio wave is detected by the noise squelch circuit 25, the microcomputer 14 determines that the receiving operation can be performed.

【0014】次に、高周波信号の周波数変換(第一中間
周波数への周波数変換)について、図1を用いて説明す
る。この周波数変換は、フロントエンド2から伝送され
た高周波信号と第一局部発振器13から伝送された発振
信号とが混合することにより行われる。この発振信号の
発振周波数は、マイコン14により所定の周波数に設定
されている。そして、このマイコン14はクロック発振
器15から出力されたクロック信号により動作する。
Next, frequency conversion of a high-frequency signal (frequency conversion to a first intermediate frequency) will be described with reference to FIG. This frequency conversion is performed by mixing a high-frequency signal transmitted from the front end 2 and an oscillation signal transmitted from the first local oscillator 13. The oscillation frequency of the oscillation signal is set to a predetermined frequency by the microcomputer 14. The microcomputer 14 operates according to the clock signal output from the clock oscillator 15.

【0015】次に、クロック発振器15の動作につい
て、図4を用いて説明する。図4に示すクロック発振器
15は、マイコン14によりクロック発振周波数を制御
される。通常の受信動作を行うときは輻射された電波の
周波数が受信周波数の帯域外となるように制御される。
一方、受信動作を点検するときは輻射された電波の周波
数が受信周波数の帯域内となるように制御される。クロ
ック発振器15は、水晶振動子16、コンデンサ17〜
20、可変容量ダイオード21、22、抵抗23、2
4、マイコン14からの制御信号線26、27を備えて
いる。クロック信号周波数は水晶振動子16の発振周波
数、コンデンサ17〜20、可変容量ダイオード21、
22の電気容量により決定される。可変容量ダイオード
21、22の電気容量はマイコン14からの制御信号の
レベルに応じて変化するため、受信動作を行うか受信動
作の点検を行うかに応じて制御信号のレベルを変えるこ
とで輻射された電波の周波数を受信周波数の帯域外、又
は帯域内に切り替えることができる。
Next, the operation of the clock oscillator 15 will be described with reference to FIG. The clock oscillation frequency of the clock oscillator 15 shown in FIG. When a normal reception operation is performed, control is performed so that the frequency of the radiated radio wave is out of the reception frequency band.
On the other hand, when checking the reception operation, control is performed so that the frequency of the radiated radio wave falls within the band of the reception frequency. The clock oscillator 15 includes a crystal oscillator 16, a capacitor 17 to
20, variable capacitance diodes 21, 22, resistors 23, 2
4. Control signal lines 26 and 27 from the microcomputer 14 are provided. The clock signal frequency is the oscillation frequency of the crystal oscillator 16, the capacitors 17 to 20, the variable capacitance diode 21,
22. Since the electric capacitance of the variable capacitance diodes 21 and 22 changes according to the level of the control signal from the microcomputer 14, radiation is performed by changing the level of the control signal according to whether the reception operation is performed or the reception operation is checked. The frequency of the received radio wave can be switched outside or within the band of the reception frequency.

【0016】例えば、受信周波数fR=154.825
0(MHz)、受信帯域幅B=12(KHz)の場合、
受信動作を行うときは輻射電波の周波数が受信周波数の
帯域外となるようにクロック信号周波数fC=3.68
66(KHz)に設定する。(このクロック信号の逓倍
波は全て受信周波数の帯域外となる。)一方、受信動作
の点検を行うときは輻射電波の周波数が受信周波数の帯
域内となるようにクロック信号周波数fC=3.686
4(KHz)に設定する。(このクロック信号の42倍
波は受信周波数の帯域内となる。) 受信周波数fR≠154.8250(MHz)の場合で
も受信動作を行うときは輻射電波の周波数を受信周波数
の帯域外となるようにし、受信動作の確認を行うときは
輻射電波の周波数を受信周波数の帯域内となるようにで
きるのは明らかである。従って、多チャンネル受信機の
ときも受信動作を行うか受信動作の点検を行うかに応じ
て制御信号のレベルを変えることで輻射された電波の周
波数を受信周波数の帯域外、又は帯域内に切り替えるこ
とができるのは明らかである。
For example, the reception frequency fR = 154.825
0 (MHz) and reception bandwidth B = 12 (KHz),
When performing the reception operation, the clock signal frequency fC = 3.68 so that the frequency of the radiated radio wave is out of the band of the reception frequency.
Set to 66 (KHz). (All the multiplied waves of the clock signal are out of the band of the reception frequency.) On the other hand, when checking the reception operation, the clock signal frequency fC = 3.686 so that the frequency of the radiated radio wave is within the band of the reception frequency.
Set to 4 (KHz). (The 42nd harmonic of this clock signal falls within the band of the reception frequency.) Even when the reception frequency fR ≠ 154.8250 (MHz), the frequency of the radiated radio wave is out of the band of the reception frequency when performing the reception operation. Obviously, when confirming the receiving operation, the frequency of the radiated radio wave can be set within the band of the receiving frequency. Therefore, even in the case of a multi-channel receiver, the frequency of the radiated radio wave is switched out of the receiving frequency band or in the band by changing the level of the control signal depending on whether the receiving operation is performed or the receiving operation is checked. Obviously you can.

【0017】以上のように本実施例の受信機では、単体
で受信動作の点検を行うことができる。そしてこの受信
動作の点検は例えばマイコン14に切替スイッチを接続
することにより扱者の操作に応じて行うことができる。
また、例えば受信機の電源を入れたときに受信動作の点
検を行えるようにマイコン14を動作させることもでき
る。そして、受信動作を点検した結果、正常に動作して
いるときは通常の受信動作に移行するが、動作が異常な
ときは例えばアラーム表示やアラーム音により扱者に報
知することができる。
As described above, the receiver according to the present embodiment can independently check the receiving operation. Inspection of the reception operation can be performed according to the operation of the operator by connecting a changeover switch to the microcomputer 14, for example.
Further, the microcomputer 14 can be operated so that the receiving operation can be checked when the power of the receiver is turned on, for example. Then, as a result of checking the receiving operation, when the operation is normal, the operation shifts to the normal receiving operation. When the operation is abnormal, the operator can be notified by, for example, an alarm display or an alarm sound.

【0018】本実施例では検出手段にノイズスケルチ回
路を用いた場合について説明したがこれに限定されるも
のではない。制御手段から電波が輻射されたことを検出
する検出手段であるのならば、単体で受信動作の点検を
行うことができる。また多チャンネル受信機の場合、本
実施例の様にクロック信号周波数を制御するのではな
く、チャンネルスイッチを操作して受信周波数を調整す
ることで輻射電波が受信周波数帯域内となるようにして
も受信動作の点検を行うことができる。
In this embodiment, the case where the noise squelch circuit is used as the detecting means has been described, but the present invention is not limited to this. If the detection means detects that the radio wave is radiated from the control means, the reception operation can be checked by itself. In the case of a multi-channel receiver, instead of controlling the clock signal frequency as in the present embodiment, the reception frequency is adjusted by operating a channel switch so that the radiated radio waves fall within the reception frequency band. The receiving operation can be checked.

【0019】[0019]

【発明の効果】以上説明したように本発明によれば、輻
射電波の周波数が受信周波数帯域内となるように調整
し、輻射電波を受信するかを判別するようにしたため、
測定器や相手局を用いたりまたは新たに測定部を受信機
に備えたりすることなく、単体で受信動作の点検を行う
ことができる。従って、極めて利便性の良い受信機を提
供することができる。
As described above, according to the present invention, the frequency of the radiated radio wave is adjusted to be within the reception frequency band, and it is determined whether to receive the radiated radio wave.
Inspection of the receiving operation can be performed independently without using a measuring instrument or a partner station or newly providing a measuring unit in the receiver. Therefore, an extremely convenient receiver can be provided.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例である受信機の構成を示すブ
ロック図
FIG. 1 is a block diagram showing a configuration of a receiver according to one embodiment of the present invention.

【図2】従来の一例である受信機の構成を示すブロック
FIG. 2 is a block diagram showing a configuration of a receiver as an example of the related art.

【図3】従来の一例である受信機のクロック発振器の構
成を示す回路図
FIG. 3 is a circuit diagram showing a configuration of a clock oscillator of a receiver as an example of the related art.

【図4】従来の一例、及び本発明の一実施例である受信
機のクロック発振器の構成を示す回路図
FIG. 4 is a circuit diagram illustrating a configuration of a clock oscillator of a receiver according to an example of the related art and an example of the present invention.

【符号の説明】[Explanation of symbols]

1:アンテナ 2:フロントエ
ンド 3:第一ミクサ 4:帯域濾波器 5:第一中間周波増幅器 6:第二ミクサ 7:帯域濾波器 8:第二中間周
波増幅器 9:復調器 10:ベースバ
ンド信号処理回路 11:スピーカ 12:第二局部
発振器 13:第一局部発振器 14:マイコン 15:クロック発振器 16:水晶振動
子 17:コンデンサ 18:コンデン
サ 19:コンデンサ 20:コンデン
サ 21:可変容量ダイオード 22:可変容量
ダイオード 23:抵抗 24:抵抗 25:ノイズスケルチ 26:制御信号
線 27:制御信号線
1: Antenna 2: Front end 3: First mixer 4: Band filter 5: First intermediate frequency amplifier 6: Second mixer 7: Band filter 8: Second intermediate frequency amplifier 9: Demodulator 10: Baseband signal Processing circuit 11: Speaker 12: Second local oscillator 13: First local oscillator 14: Microcomputer 15: Clock oscillator 16: Crystal oscillator 17: Capacitor 18: Capacitor 19: Capacitor 20: Capacitor 21: Variable capacitance diode 22: Variable capacitance Diode 23: resistor 24: resistor 25: noise squelch 26: control signal line 27: control signal line

フロントページの続き Fターム(参考) 5K020 DD02 DD03 DD05 EE05 FF00 GG11 KK04 MM04 MM11 MM12 NN01 NN10 5K042 CA02 CA12 DA03 DA13 EA03 FA12 FA29 JA01 NA03 NA04 5K052 AA03 BB04 DD16 EE12 EE17 FF26 FF34 GG22 GG57 5K061 AA10 AA11 BB01 CC13 CC21 CC25 CC51 CC53 HH04 JJ05 JJ06 JJ09 JJ12 Continued on the front page F term (reference) 5K020 DD02 DD03 DD05 EE05 FF00 GG11 KK04 MM04 MM11 MM12 NN01 NN10 5K042 CA02 CA12 DA03 DA13 EA03 FA12 FA29 JA01 NA03 NA04 5K052 AA03 BB04 DD16 EE12 EE17 FF26 GGA CC13 GG26 CC51 CC53 HH04 JJ05 JJ06 JJ09 JJ12

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】相手局からの信号を受信する受信部と、該
受信部に接続され受信した信号の周波数を所要値に変換
する周波数変換手段と、該周波数変換手段の動作を制御
する制御手段と、該制御手段を動作させるクロック信号
を生成して出力するクロック発振器と、周波数変換手段
の後段に設けられ音声信号に変換する復調手段とを含む
受信機において、 前記復調手段に接続され点検時において復調出力信号の
中から輻射電波の有無を検出する検出手段を備え、前記
制御手段は輻射電波の周波数が受信周波数帯域内となる
ようにクロック信号周波数を制御し前記検出手段の出力
が受信周波数帯域内であるかを判定する制御手段であっ
て、単体で受信動作の点検を行うように構成したことを
特徴とする受信機。
1. A receiving unit for receiving a signal from a partner station, a frequency converting unit connected to the receiving unit for converting a frequency of a received signal into a required value, and a control unit for controlling an operation of the frequency converting unit. A clock oscillator for generating and outputting a clock signal for operating the control means, and a demodulation means provided at a subsequent stage of the frequency conversion means for converting to an audio signal. Detecting means for detecting the presence or absence of radiated radio waves from the demodulated output signal, wherein the control means controls the clock signal frequency so that the frequency of the radiated radio waves is within a receiving frequency band, and the output of the detecting means is a receiving frequency. Control means for judging whether a signal is within a band or not, wherein the receiver is configured to independently check a reception operation.
【請求項2】相手局からの信号を受信する受信部と、該
受信部に接続され受信した信号の周波数を所要値に変換
する周波数変換手段と、該周波数変換手段の動作を制御
する制御手段と、該制御手段を動作させるクロック信号
を生成して出力するクロック発振器と、周波数変換手段
の後段に設けられ音声信号に変換する復調手段とを含む
受信機において、 前記受信部に接続され輻射電波の周波数が受信周波数帯
域内となるように受信周波数を設定する操作手段と、前
記復調手段に接続され点検時において復調出力信号の中
から輻射電波の有無を検出する検出手段とを備え、前記
制御手段は前記検出手段の出力が受信周波数帯域内であ
るかを判定する制御手段であって、単体で受信動作の点
検を行うように構成したことを特徴とする受信機。
2. A receiving section for receiving a signal from a partner station, frequency converting means connected to the receiving section for converting the frequency of the received signal to a required value, and control means for controlling the operation of the frequency converting means. A clock oscillator that generates and outputs a clock signal for operating the control means, and a demodulation means provided at a subsequent stage of the frequency conversion means and converts the signal into an audio signal. Operating means for setting the receiving frequency so that the frequency is within the receiving frequency band, and detecting means connected to the demodulating means for detecting the presence or absence of radiated radio waves from the demodulated output signal at the time of inspection, the control means The receiver is a control unit that determines whether the output of the detection unit is within a reception frequency band, and is configured to independently check the reception operation.
JP34970199A 1999-12-09 1999-12-09 Receiving machine Expired - Fee Related JP4249867B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34970199A JP4249867B2 (en) 1999-12-09 1999-12-09 Receiving machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34970199A JP4249867B2 (en) 1999-12-09 1999-12-09 Receiving machine

Publications (2)

Publication Number Publication Date
JP2001168753A true JP2001168753A (en) 2001-06-22
JP4249867B2 JP4249867B2 (en) 2009-04-08

Family

ID=18405530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34970199A Expired - Fee Related JP4249867B2 (en) 1999-12-09 1999-12-09 Receiving machine

Country Status (1)

Country Link
JP (1) JP4249867B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234292A (en) * 2010-04-30 2011-11-17 Kenwood Corp Radio device, and operating clock frequency control method for the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234292A (en) * 2010-04-30 2011-11-17 Kenwood Corp Radio device, and operating clock frequency control method for the same

Also Published As

Publication number Publication date
JP4249867B2 (en) 2009-04-08

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