JPS6247014B2 - - Google Patents
Info
- Publication number
- JPS6247014B2 JPS6247014B2 JP57086098A JP8609882A JPS6247014B2 JP S6247014 B2 JPS6247014 B2 JP S6247014B2 JP 57086098 A JP57086098 A JP 57086098A JP 8609882 A JP8609882 A JP 8609882A JP S6247014 B2 JPS6247014 B2 JP S6247014B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency
- monitoring
- power
- power supply
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/18—Monitoring during normal operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Transmitters (AREA)
Description
【発明の詳細な説明】
〔技術分野の説明〕
本発明はFM（周波数変調）送信装置に関す
る。特に、規定周波数外の電波放射を防止する
FM変調器の周波数監視回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Description of the Technical Field] The present invention relates to an FM (frequency modulation) transmitter. In particular, prevent radio wave radiation outside the specified frequency.
Concerning a frequency monitoring circuit for an FM modulator.
従来、マイクロ波周波数のような高周波数帯で
発振する発振素子を用いるFM変調器では、機械
的歪み等によつて周波数変動を起すことがあり、
自動周波数制御回路（以下「AFC回路」とい
う。）を備え、これにより発振周波数を安定化す
る方法が採用される。この場合に、マイクロ周波
数を直接周波数弁別することは周波数安定度が不
十分であるため、一たん水晶発振器の高調波を用
いて中間周波数に変換してから周波数弁別を行
う、いわゆるヘテロダイン型のAFC回路が採用
されている。この場合には、中間周波数の変動を
監視すれば間接的にマイクロ波周波数を監視する
ことになる。この方法によつて周波数を監視し現
用予備の２つの変調器の出力を切り換える方式は
良く知られている。
Conventionally, in FM modulators that use oscillation elements that oscillate in high frequency bands such as microwave frequencies, frequency fluctuations may occur due to mechanical distortion, etc.
A method is adopted in which an automatic frequency control circuit (hereinafter referred to as "AFC circuit") is provided to stabilize the oscillation frequency. In this case, direct frequency discrimination of the micro-frequency results in insufficient frequency stability, so a so-called heterodyne type AFC is used, which first converts the harmonics of a crystal oscillator to an intermediate frequency and then performs frequency discrimination. circuit is used. In this case, monitoring the fluctuation of the intermediate frequency indirectly monitors the microwave frequency. This method of monitoring the frequency and switching the outputs of two active and standby modulators is well known.
しかし、この方法は一方の変調器の信号が空間
伝搬によつて他方の変調器にもれ込み、電波障害
となる場合がある。このような電波障害を防止す
るためには、異常動作の変調器の発振を止めるこ
とが望ましい。しかし、AFC回路は変調信号に
追従しないように時定数の大きい応答特性を持つ
ているため、変調器の電源投入時にAFC回路が
動作するまえに周波数監視回路が動作してしまう
欠点がある。このために周波数監視回路の応答特
性を電源の立上りより遅くすることも考えられる
がこれでは周波数異常を検出するために時間がか
かり、周波数監視の機能を十分に果すことができ
なくなる。 However, with this method, the signal from one modulator may leak into the other modulator due to spatial propagation, causing radio wave interference. In order to prevent such radio wave interference, it is desirable to stop the oscillation of the abnormally operating modulator. However, since the AFC circuit has a response characteristic with a large time constant so that it does not follow the modulation signal, it has the disadvantage that the frequency monitoring circuit operates before the AFC circuit operates when the modulator is powered on. For this reason, it is conceivable to make the response characteristic of the frequency monitoring circuit slower than the rise of the power supply, but in this case, it takes time to detect frequency abnormalities, and the frequency monitoring function cannot be fully performed.
本発明はこの点を改良するもので、周波数監視
回路の応答特性を十分速くしても電源の立上り時
に誤つて異常を検出することのないFM変調器の
監視制御回路を提供することを目的とする。
The present invention improves this point, and aims to provide an FM modulator monitoring and control circuit that does not erroneously detect an abnormality at power-on even if the response characteristics of the frequency monitoring circuit are made sufficiently fast. do.
本発明は、FM変調回路の出力周波数を中間周
波数に変換する手段と、この中間周波数の周波数
ずれを監視する手段と、この手段に所定以上の周
波数ずれが検出されたときに上記FM変調回路に
与える電源を自動的に遮断する手段とを備えた
FM変調器の監視回路において、上記中間周波数
の周波数ずれを監視する手段を備えたことを特徴
とする。
The present invention includes a means for converting the output frequency of an FM modulation circuit into an intermediate frequency, a means for monitoring a frequency deviation of the intermediate frequency, and a means for converting the output frequency of the FM modulation circuit into an intermediate frequency when a frequency deviation of more than a predetermined value is detected in the means. and a means for automatically cutting off the power supplied to the
The monitoring circuit for the FM modulator is characterized in that it includes means for monitoring the frequency deviation of the intermediate frequency.
本発明の一実施例を図面に基づいて説明する。
図は、本発明一実施例の要部ブロツク構成図であ
る。図は、大きく分けてFM変調回路１，AFC回
路２および周波数監視回路３とで構成されてい
る。すなわち、AFC回路２内の周波数基本波発
振器５の出力は周波数変換回路６に与えられ、こ
の周波数変換回路６にはFM変調回路１の出力が
導かれる。この周波数変換回路６の出力は中間周
波数増幅器７を介して周波数弁別回路８に導かれ
ている。この周波数弁別回路８の出力はFM変調
回路１に導かれている。このFM変調回路１に
は、変調波入力端子９および変調信号波出力端子
１０がそれぞれ接続されている。
An embodiment of the present invention will be described based on the drawings.
The figure is a block diagram of essential parts of an embodiment of the present invention. In the figure, the circuit is roughly divided into an FM modulation circuit 1, an AFC circuit 2, and a frequency monitoring circuit 3. That is, the output of the frequency fundamental wave oscillator 5 in the AFC circuit 2 is given to the frequency conversion circuit 6, and the output of the FM modulation circuit 1 is guided to this frequency conversion circuit 6. The output of this frequency conversion circuit 6 is led to a frequency discrimination circuit 8 via an intermediate frequency amplifier 7. The output of this frequency discrimination circuit 8 is led to the FM modulation circuit 1. A modulated wave input terminal 9 and a modulated signal wave output terminal 10 are connected to the FM modulation circuit 1, respectively.
また、１１は変調器の電源入力端子であり、前
記周波数監視回路３内の電源遅延回路１２に接続
される。この電源遅延回路１２は前記AFC回路
２の時定数より大きい時定数を有し、この電源遅
延回路１２の出力は、周波数ずれ検出回路１３に
接続される。この周波数ずれ検出回路１３には中
間周波数増幅器７の出力が導かれている。この周
波数ずれ検出回路１３の出力は、前記FM変調回
路１の電源スイツチ回路１４の制御端子に導かれ
る。前記電源入力端子１１はこの電源スイツチ回
路１４を介して前記FM変調回路１の電源端子に
導かれている。また、この電源入力端子１１は前
記AFC回路２の電源端子に接続されている。 Further, 11 is a power input terminal of the modulator, and is connected to the power supply delay circuit 12 in the frequency monitoring circuit 3. This power supply delay circuit 12 has a time constant larger than the time constant of the AFC circuit 2, and the output of this power supply delay circuit 12 is connected to a frequency shift detection circuit 13. The output of the intermediate frequency amplifier 7 is led to this frequency shift detection circuit 13. The output of this frequency shift detection circuit 13 is led to a control terminal of a power switch circuit 14 of the FM modulation circuit 1. The power input terminal 11 is led to the power terminal of the FM modulation circuit 1 via this power switch circuit 14. Further, this power input terminal 11 is connected to the power terminal of the AFC circuit 2.
このような回路構成で、本発明の特徴ある動作
について説明する。電源入力端子１１から電源電
圧が供給されると、電源スイツチ回路１４を介し
てFM変調回路１に供給されFM変調回路１が動
作するとともに、AFC回路２にも電源電圧が供
給され、AFC回路２も動作する。このAFC回路
２の電源立上り時間中には、周波数監視回路３に
供給される電源は、電源遅延回路１２の時定数に
より電源立上りが遅延され、周波数監視回路は動
作しない。周波数監視回路３は遅延回路１２の遅
延時間を経過すると動作状態となり、周波数ずれ
検出回路１３が中間周波数増幅器７からの中間周
波数の変動を監視する。この状態で、周波数監視
回路３で周波数ずれを検出すると電源スイツチ回
路１４を開放し、FM変調回路１の電源を断とし
周波数ずれの信号を出力しないように動作する。 The characteristic operation of the present invention will be explained using such a circuit configuration. When the power supply voltage is supplied from the power input terminal 11, it is supplied to the FM modulation circuit 1 via the power switch circuit 14, and the FM modulation circuit 1 operates.At the same time, the power supply voltage is also supplied to the AFC circuit 2, and the AFC circuit 2 also works. During the power rise time of the AFC circuit 2, the power supply supplied to the frequency monitoring circuit 3 is delayed in power rise due to the time constant of the power supply delay circuit 12, and the frequency monitoring circuit does not operate. The frequency monitoring circuit 3 becomes operational after the delay time of the delay circuit 12 has elapsed, and the frequency deviation detection circuit 13 monitors the fluctuation of the intermediate frequency from the intermediate frequency amplifier 7. In this state, when the frequency monitoring circuit 3 detects a frequency deviation, the power switch circuit 14 is opened, the power to the FM modulation circuit 1 is cut off, and the frequency deviation signal is not outputted.
以上説明したように本発明によれば、ヘテロダ
イン型AFC回路の中間周波数ずれを監視する周
波数監視回路にAFC回路の電源立上り時間より
大きい立上り時間を有する電源遅延回路を備える
こととした。
As described above, according to the present invention, the frequency monitoring circuit that monitors the intermediate frequency deviation of the heterodyne AFC circuit is provided with a power supply delay circuit having a rise time longer than the power rise time of the AFC circuit.
したがつて、AFG回路の電源立上り時にはこ
の周波数監視回路を停止させることができ周波数
監視回路の応答特性を十分速くしても電源の立上
り時に誤つて異常を検出することがない。また、
AFC回路動作中には従来と同様な周波数ずれを
検出すると直ちにFM変調器を停止させ不要信号
波を放射することを防止することができる。 Therefore, this frequency monitoring circuit can be stopped when the power to the AFG circuit is turned on, and even if the response characteristics of the frequency monitoring circuit are made sufficiently fast, no abnormality will be erroneously detected when the power is turned on. Also,
While the AFC circuit is operating, it is possible to immediately stop the FM modulator when detecting a frequency shift similar to the conventional method, thereby preventing the emission of unnecessary signal waves.
また、本発明は変調波断や異常電圧監視にも応
用することができFM変調器の信頼性を向上する
ことができる。 Furthermore, the present invention can be applied to monitoring modulated wave interruption and abnormal voltage, and can improve the reliability of the FM modulator.
図は本発明一実施例の要部ブロツク構成図。
１……FM変調回路、２……AFC回路、３……
周波数監視回路、５……周波数基本波発振器、６
……周波数変換回路、７……中間周波数増幅器、
８……周波数弁別回路、９……変調波入力端子、
１０……変調信号波出力端子、１１……電源入力
端子、１２……電源遅延回路、１３……周波数ず
れ検出回路、１４……電源スイツチ回路。
The figure is a block diagram of essential parts of an embodiment of the present invention. 1...FM modulation circuit, 2...AFC circuit, 3...
Frequency monitoring circuit, 5... Frequency fundamental wave oscillator, 6
...Frequency conversion circuit, 7...Intermediate frequency amplifier,
8... Frequency discrimination circuit, 9... Modulated wave input terminal,
10...Modulated signal wave output terminal, 11...Power input terminal, 12...Power delay circuit, 13...Frequency shift detection circuit, 14...Power switch circuit.
Claims (1)
換する手段と、この中間周波数の周波数ずれを監
視する手段と、この手段に所定以上の周波数ずれ
が検出されたときに上記FM変調回路に与える電
源を自動的に遮断する手段とを備えたFM変調器
の監視回路において、上記中間周波数の周波数ず
れを監視する手段の動作を電源立上がり時間中に
禁止する手段を備えたことを特徴とするFM変調
器の監視制御回路。1 A means for converting the output frequency of the FM modulation circuit into an intermediate frequency, a means for monitoring the frequency deviation of the intermediate frequency, and a power supply to the FM modulation circuit when a frequency deviation of more than a predetermined value is detected to this means. An FM modulator monitoring circuit comprising means for automatically shutting off, characterized in that the circuit comprises means for inhibiting operation of the means for monitoring frequency deviation of the intermediate frequency during power supply rise time. supervisory control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57086098A JPS58202640A (en) | 1982-05-21 | 1982-05-21 | Monitoring control circuit of fm modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57086098A JPS58202640A (en) | 1982-05-21 | 1982-05-21 | Monitoring control circuit of fm modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58202640A JPS58202640A (en) | 1983-11-25 |
| JPS6247014B2 true JPS6247014B2 (en) | 1987-10-06 |
Family
ID=13877226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57086098A Granted JPS58202640A (en) | 1982-05-21 | 1982-05-21 | Monitoring control circuit of fm modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58202640A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4862709B2 (en) * | 2007-03-19 | 2012-01-25 | 株式会社Ｊｖｃケンウッド | Wireless communication device and program |
-
1982
- 1982-05-21 JP JP57086098A patent/JPS58202640A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58202640A (en) | 1983-11-25 |
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