JPS632492B2 - - Google Patents
Info
- Publication number
- JPS632492B2 JPS632492B2 JP12870982A JP12870982A JPS632492B2 JP S632492 B2 JPS632492 B2 JP S632492B2 JP 12870982 A JP12870982 A JP 12870982A JP 12870982 A JP12870982 A JP 12870982A JP S632492 B2 JPS632492 B2 JP S632492B2
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- noise
- remote control
- control
- voltage
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present
- H03G3/344—Muting responsive to the amount of noise (noise squelch)
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】
この発明は、１台のFM波無線装置を遠隔制御
装置から制御する無線システムにおいて、遠隔制
御装置から受信出力の雑音を制御する雑音制御回
路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise control circuit that controls noise in a received output from a remote control device in a wireless system in which one FM wave radio device is controlled from a remote control device.
第１図は従来の雑音制御回路の１例を示すブロ
ツク結線図であり、図において１は無線装置、２
は受信したFM波信号を復調する周波数弁別器、
３はこの周波数弁別器の出力を増幅する低周波増
幅器、４は周波数弁別器２の出力から雑音成分を
取り出し増幅する雑音増幅器、５はこの雑音増幅
器の出力を検波増幅し直流電圧に変換しその出力
で低周波増幅器３を制御する直流増幅器、６は変
調信号増幅器、７は送受切換器、８は無線装置１
の入出力と伝送線路９との整合をとるためのイン
ピーダンス整合トランス、１０は遠隔制御装置、
１１は伝送線路９と遠隔制御装置１０との整合を
とるためのインピーダンス整合トランス、１２は
送受切換器、１３は送信信号増幅器、１４は低周
波増幅器３からの受信出力を増幅する低周波増幅
器、１５は拡声器、１６は雑音制御可変抵抗器、
１７はこの雑音制御可変抵抗器１６の設定レベル
に応じて直流電圧を出力するための直流増幅器で
ある。 FIG. 1 is a block wiring diagram showing an example of a conventional noise control circuit.
is a frequency discriminator that demodulates the received FM wave signal,
3 is a low frequency amplifier that amplifies the output of this frequency discriminator, 4 is a noise amplifier that extracts and amplifies the noise component from the output of frequency discriminator 2, and 5 is a signal that detects and amplifies the output of this noise amplifier and converts it into a DC voltage. A DC amplifier that controls the low frequency amplifier 3 with its output, 6 a modulation signal amplifier, 7 a transmitter/receiver switch, 8 a wireless device 1
an impedance matching transformer for matching input/output with the transmission line 9; 10 is a remote control device;
11 is an impedance matching transformer for matching the transmission line 9 and the remote control device 10; 12 is a transmitting/receiving switch; 13 is a transmitting signal amplifier; 14 is a low frequency amplifier for amplifying the received output from the low frequency amplifier 3; 15 is a loudspeaker, 16 is a noise control variable resistor,
Reference numeral 17 denotes a DC amplifier for outputting a DC voltage according to the level set by the noise control variable resistor 16.
上記のように構成された雑音制御回路において
は、無線装置１により受信されたFM受信信号
は、高周波増幅器、混合器、中間周波増幅器等
（図では省略してある）を経て、周波数弁別器１
により復調される。復調された信号は低周波増幅
器３により増幅された後、送受切換器７、インピ
ーダンス整合トランス８を経て伝送線路９に送出
される。この信号は遠隔制御装置１０で受信さ
れ、インピーダンス整合トランス１１、送受切換
器１１を通り低周波増幅器１４で増幅された後、
拡声器１５により音声に変換され伝えられる。 In the noise control circuit configured as described above, the FM reception signal received by the radio device 1 passes through a high frequency amplifier, a mixer, an intermediate frequency amplifier, etc. (not shown in the figure), and then passes through a frequency discriminator 1.
It is demodulated by The demodulated signal is amplified by a low frequency amplifier 3 and then sent to a transmission line 9 via a transmitter/receiver switch 7 and an impedance matching transformer 8 . This signal is received by the remote control device 10, passes through an impedance matching transformer 11, a transmitter/receiver switch 11, and is amplified by a low frequency amplifier 14.
The loudspeaker 15 converts it into audio and transmits it.
送信信号は送信信号増幅器１３により増幅さ
れ、送受切換器１２、インピーダンス整合トラン
ス１１、伝送線路９、インピーダンス整合トラン
ス８、送受切換器７、変調信号増幅器６等を経て
送信回路（図では省略してある）からFM信号波
として送出される。 The transmission signal is amplified by a transmission signal amplifier 13, and then passes through a transmission/reception switch 12, an impedance matching transformer 11, a transmission line 9, an impedance matching transformer 8, a transmission/reception switch 7, a modulation signal amplifier 6, etc. to a transmission circuit (not shown in the figure). ) is sent out as an FM signal wave.
いま受信波がなくなつた場合、又は受信波が微
弱になつた場合には、周波数弁別器１出力は、殆
んど雑音成分のみになるので周波数弁別器１出力
のうち、雑音成分を雑音増幅器４で増幅し、直流
増幅器５により直流電圧に変換した後低周波増幅
器３を復調雑音量に応じて断とするスケルチ動作
を行なわせる。 If the received wave is no longer present, or if the received wave has become weak, the output of the frequency discriminator 1 will almost always consist of noise components. 4 and converted into a DC voltage by a DC amplifier 5, a squelch operation is performed in which the low frequency amplifier 3 is turned off according to the amount of demodulation noise.
なおこの時スケルチ動作の動作点は遠隔制御器
１０の雑音制御可変抵抗器１６によつて行う。雑
音制御可変抵抗器１６によつて吹定された直流電
圧は伝送線路９上で低周波信号に重畳され（又は
独立して）無線装置１に送られ、雑音増幅器４又
は直流増幅器５の増幅度を制御する。 At this time, the operating point of the squelch operation is determined by the noise control variable resistor 16 of the remote controller 10. The DC voltage blown by the noise control variable resistor 16 is superimposed on a low frequency signal on the transmission line 9 (or independently) and sent to the wireless device 1, and the amplification degree of the noise amplifier 4 or the DC amplifier 5 is control.
従来の雑音制御回路は上記のように構成されて
いたので、１台の遠隔制御装置１０からのみ無線
装置１の雑音制御が可能であり、複数の遠隔制御
装置が並列に接続された場合には、他の遠隔制御
装置では、任意に雑音制御レベルを設定（又は
断）とすることができず、遠隔制御装置の設置さ
れた場所それぞれの環境のもとで最適な状態にお
いて通話をすることができないため、通信の効率
が下がるなどの欠点があつた。 Since the conventional noise control circuit is configured as described above, it is possible to control the noise of the wireless device 1 only from one remote control device 10, and when multiple remote control devices are connected in parallel, With other remote control devices, it is not possible to set (or turn off) the noise control level arbitrarily, and it is not possible to set (or turn off) the noise control level arbitrarily. This resulted in drawbacks such as reduced communication efficiency.
この発明は上記のような従来の雑音制御回路の
欠点を除去するためになされたもので、各装置を
大形かつ複雑化することなく、また伝送線路を増
やすことなく、各遠隔制御装置から各々独立に雑
音制御ができる雑音制御回路を得ることを目的と
するものである。 This invention was made in order to eliminate the drawbacks of the conventional noise control circuit as described above. The purpose of this invention is to obtain a noise control circuit that can independently control noise.
第２図はこの発明の一実施例を示すブロツク結
線図であり、１〜３，６〜１６は上記第１図の同
一符号と同一又は相当部分を示すものである。 FIG. 2 is a block diagram showing an embodiment of the present invention, and 1 to 3 and 6 to 16 indicate the same or corresponding parts as the same reference numerals in FIG. 1 above.
図において２０は周波数弁別器２の出力から雑
音成分を取り出し増幅する雑音増幅器、２１はこ
の雑音増幅器の出力を検波増幅し直流電圧に変換
する直流増幅器、２２は複数の伝送線路９，２
３，２４に低周波増幅器３及び直流増幅器２１の
出力を分配及び伝送線路９，２３，２４からの送
信信号を結合する制御増幅器、２５及び２６はそ
れぞれ伝送線路２３，２４との整合をとるための
インピーダンス整合トランス、２７は伝送線路９
からの雑音制御の直流電圧を増幅し雑音制御可変
抵抗器１６の設定に応じて低周波増幅器１４を制
御する直流増幅器、２８，２９はそれぞれ各局の
遠隔制御装置である。 In the figure, 20 is a noise amplifier that extracts and amplifies the noise component from the output of the frequency discriminator 2, 21 is a DC amplifier that detects and amplifies the output of this noise amplifier and converts it into a DC voltage, and 22 is a plurality of transmission lines 9, 2.
Control amplifiers 3 and 24 distribute the outputs of the low frequency amplifier 3 and the DC amplifier 21 and couple the transmission signals from the transmission lines 9, 23 and 24, and 25 and 26 are used for matching with the transmission lines 23 and 24, respectively. impedance matching transformer, 27 is a transmission line 9
DC amplifiers 28 and 29 are remote control devices for each station, respectively, for amplifying the noise control DC voltage from the station and controlling the low frequency amplifier 14 according to the setting of the noise control variable resistor 16.
上記のように構成された雑音制御回路において
は、周波数弁別器２で復調された受信信号は、低
周波増幅器３で増幅された後制御増幅器２２で分
配され伝送線路９，２３，２４に送り出される。 In the noise control circuit configured as above, the received signal demodulated by the frequency discriminator 2 is amplified by the low frequency amplifier 3, then distributed by the control amplifier 22, and sent out to the transmission lines 9, 23, and 24. .
伝送線路９を伝送し、遠隔制御装置１０で受信
された信号は低周波増幅器１４で増幅され、拡声
器１５で音声に変換される。 A signal transmitted through the transmission line 9 and received by the remote control device 10 is amplified by the low frequency amplifier 14 and converted into sound by the loudspeaker 15.
受信波がない場合、あるいは微弱な場合には、
周波数弁別器２の出力に雑音成分が多く、この雑
音成分を雑音増幅器２０で増幅し、直流増幅器２
１で検波整流を行い、雑音量に比例した直流電圧
に変換する。この直流電圧は制御増幅器２２で各
伝送線路９，２３，２４に分配される。伝送線路
９を伝送し、遠隔制御装置１０で受信された直流
電圧は、直流増幅器２７において雑音制御可変抵
抗器１６により設定された直流電圧と比較され、
設定電圧より高い場合（あるいは低い場合）に低
周波増幅器１４の動作を断として、スケルチ動作
を行う。 If there is no received wave or the signal is weak,
There are many noise components in the output of the frequency discriminator 2, and this noise component is amplified by the noise amplifier 20, and then the DC amplifier 2
1 performs detection rectification and converts it into a DC voltage proportional to the amount of noise. This DC voltage is distributed to each transmission line 9, 23, and 24 by a control amplifier 22. The DC voltage transmitted through the transmission line 9 and received by the remote control device 10 is compared with the DC voltage set by the noise control variable resistor 16 in the DC amplifier 27,
When the voltage is higher (or lower) than the set voltage, the operation of the low frequency amplifier 14 is cut off and a squelch operation is performed.
なおこの雑音制御可変抵抗器１６の設定は、他
の遠隔制御装置２８，２９内の雑音制御可変抵抗
器（図示は省略してある）に関係なく独立して操
作を行うことができる。 Note that the setting of the noise control variable resistor 16 can be performed independently without regard to the noise control variable resistors (not shown) in the other remote control devices 28 and 29.
なお上記実施例では、雑音制御レベルの設定を
雑音制御可変抵抗器１６による連続可変の場合に
ついて述べたが、レベルの設定を固定抵抗器等に
より固定とし、雑音制御接断スイツチを設け、こ
のスイツチにより雑音制御機能を接断してもよ
い。 In the above embodiment, the setting of the noise control level is continuously variable using the noise control variable resistor 16. The noise control function may be disconnected by
また上記実施例では無線装置１に接続される遠
隔制御装置１０，２８，２９が３台の場合を示し
たが、Ｎ台（Ｎは２以上の正の整数）並列に接続
された場合でも同様の効果を奏することは云うま
でもない。 In addition, although the above embodiment shows a case where three remote control devices 10, 28, and 29 are connected to the wireless device 1, the same applies when N devices (N is a positive integer of 2 or more) are connected in parallel. Needless to say, it has the following effects.
この発明は以上説明したとおり、制御増幅器に
より低周波信号及び雑音直流電圧を遠隔制御装置
に分配し各遠隔制御装置ごとに設定したレベルに
よりスケルチ動作を行なわせるようにしたので、
各遠隔制御装置の置かれた環境あるいは操作者に
合つた状態でスケルチ動作を行うことができ、し
たがつて通信の効率があがり、また操作する者の
疲労を少なくし、周囲の人に騒音防害を与えない
という効果がある。 As explained above, in this invention, a low frequency signal and a noise DC voltage are distributed to remote control devices by a control amplifier, and the squelch operation is performed according to a level set for each remote control device.
Squelch operations can be performed in conditions that suit the environment in which each remote control device is placed or the operator, thus increasing communication efficiency, reducing operator fatigue, and providing noise protection to surrounding people. It has the effect of not causing any harm.
第１図は従来の雑音制御回路の一例を示すブロ
ツク結線図、第２図はこの発明の一実施例を示す
ブロツク結線図である。
図において１は無線装置、２は周波数弁別器、
３は低周波増幅器、１０は遠隔制御装置、１４は
低周波増幅器、１６は雑音制御可変抵抗器、２０
は雑音増幅器、２１は直流増幅器、２２は制御増
幅器、２７は直流増幅器である。なお、各図中同
一符号は、同一または相当部分を示すものとす
る。
FIG. 1 is a block diagram showing an example of a conventional noise control circuit, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a wireless device, 2 is a frequency discriminator,
3 is a low frequency amplifier, 10 is a remote control device, 14 is a low frequency amplifier, 16 is a noise control variable resistor, 20
is a noise amplifier, 21 is a DC amplifier, 22 is a control amplifier, and 27 is a DC amplifier. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (1)
遠隔制御する無線システムの雑音制御回路におい
て、上記無線装置内に設置され復調信号の中から
取り出した雑音成分を直流電圧に変換する直流増
幅器と、上記無線装置内に設置され復調信号と上
記直流増幅器の出力とを上記各遠隔制御装置に分
配する制御増幅器と、上記各遠隔制御装置内に設
置され上記制御増幅器より分配された復調信号を
増幅する低周波増幅器と、上記遠隔制御装置内に
設置され上記制御増幅器より分配された雑音直流
電圧を増幅しその設定レベルに応じて上記低周波
増幅器の出力を断とするスケルチ直流増幅器とを
備えたことを特徴とする雑音制御回路。1. In a noise control circuit for a wireless system that remotely controls one wireless device from a plurality of remote control devices, a DC amplifier installed in the wireless device and converts the noise component extracted from the demodulated signal into a DC voltage; , a control amplifier installed in the wireless device to distribute the demodulated signal and the output of the DC amplifier to each of the remote control devices; and a control amplifier installed in each of the remote control devices to amplify the demodulated signal distributed from the control amplifier. and a squelch DC amplifier installed in the remote control device to amplify the noise DC voltage distributed by the control amplifier and cut off the output of the low frequency amplifier according to the set level. A noise control circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12870982A JPS5917731A (en) | 1982-07-21 | 1982-07-21 | Noise control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12870982A JPS5917731A (en) | 1982-07-21 | 1982-07-21 | Noise control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5917731A JPS5917731A (en) | 1984-01-30 |
| JPS632492B2 true JPS632492B2 (en) | 1988-01-19 |
Family
ID=14991486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12870982A Granted JPS5917731A (en) | 1982-07-21 | 1982-07-21 | Noise control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5917731A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3011967U (en) * | 1994-12-02 | 1995-06-06 | 岩谷産業株式会社 | Simple smoked box |
| JP3020713U (en) * | 1995-07-18 | 1996-02-06 | 岩谷産業株式会社 | Simple smoked box |
-
1982
- 1982-07-21 JP JP12870982A patent/JPS5917731A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3011967U (en) * | 1994-12-02 | 1995-06-06 | 岩谷産業株式会社 | Simple smoked box |
| JP3020713U (en) * | 1995-07-18 | 1996-02-06 | 岩谷産業株式会社 | Simple smoked box |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5917731A (en) | 1984-01-30 |
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