JPH0358630A - Squelch system - Google Patents
Squelch systemInfo
- Publication number
- JPH0358630A JPH0358630A JP19551489A JP19551489A JPH0358630A JP H0358630 A JPH0358630 A JP H0358630A JP 19551489 A JP19551489 A JP 19551489A JP 19551489 A JP19551489 A JP 19551489A JP H0358630 A JPH0358630 A JP H0358630A
- Authority
- JP
- Japan
- Prior art keywords
- receiver
- transmitter
- section
- signal
- squelch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 6
- 230000001629 suppression Effects 0.000 claims description 2
- 230000005684 electric field Effects 0.000 abstract description 6
- 230000010355 oscillation Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Radio Relay Systems (AREA)
- Noise Elimination (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業−１二の利用分野〕
本発明は無線送受信装置におけるスケルチ方式に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry-12] The present invention relates to a squelch method in a wireless transmitter/receiver.
第２図を参照して従来のスケルチ方式について説明する
。The conventional squelch method will be explained with reference to FIG.
まず、受信機］ａは信号を受信部１１にて受信し、この
受信した信号の強弱に対し自動利得制御部（ＡＧＣ部）
１２により自動利得制御を行い、又、受信入力電界強度
の低下をＡＧＣ制御電圧により検出する。受信入力電界
が低下した場合受信機にて発生ずる雑音か送信部より送
出されるのを防止ずるため、Ａ Ｇ Ｃ制御電ｎ：によ
り検出されたスケルチ制御信号により送信機２ａのスケ
ルチ発振部２２を作動させ、送信部２３により無変調波
を送出する。First, the receiver [a] receives a signal at the receiving section 11, and controls the automatic gain control section (AGC section) based on the strength of the received signal.
12 performs automatic gain control, and a decrease in the received input electric field strength is detected using the AGC control voltage. In order to prevent the noise generated in the receiver from being transmitted from the transmitter when the receiving input electric field decreases, the squelch oscillator 22 of the transmitter 2a is activated by the squelch control signal detected by the AGC control voltage n:. is activated, and the transmitter 23 sends out an unmodulated wave.
上述した従来のスケルチ方式においては、無線送受信機
の送信ｆｉ２ａと受信機１ａとの間にスケルチ制御信号
の受ｉｆわたし用の制御線３の配線を必要とする欠点か
ある。The above-described conventional squelch system has a drawback in that it requires wiring of a control line 3 for receiving and receiving squelch control signals between the transmitter fi 2a of the wireless transceiver and the receiver 1a.
本発明は上述した欠点にかんがみてなされたものてあり
、受信機と送信機との間のスケルチ制御信号の配線を不
用とするスケルチ方式を提供することを目的としている
。The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a squelch method that eliminates the need for squelch control signal wiring between a receiver and a transmitter.
〔課題を解決するための千段）
木発明のスケルチ方式は、受信人カレヘルがあらかしめ
定めたレヘルより低いとき出力を禁止する信号抑制部を
備えた受信機と、この受信機からの入力の有無を判定す
る信号検出部及びこの信号検出部が入力照と判定したと
き作動するスゲルチ発振部を備えた送信機とを具備して
いる。[A Thousand Steps to Solve the Problems] The squelch method invented by Wood consists of a receiver equipped with a signal suppressor that prohibits output when the receiver's level is lower than a predetermined level, and an input signal from this receiver. The transmitter includes a signal detection section that determines the presence or absence of light, and a transmitter that includes a Sgerch oscillation section that operates when the signal detection section determines that there is an input light.
本発明のスケルチ方式の信畳一検出部を、受｛＞Ｅ機か
らの入力を検波する検波器と、この検波器の検波出力電
圧をあらかじめ定めた電圧と比較する比較器とを有して
構成してもよい。The squelch type signal detection unit of the present invention includes a detector that detects the input from the receiver and a comparator that compares the detected output voltage of the detector with a predetermined voltage. may be configured.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
第１図に示す実施例は、受信機１の受信部１１によって
入力信号を受信し、Ａ． Ｇ Ｃ部１２によって自動利
得制御を行い受信入力電界の低下をＡＧＣ制御電圧によ
り検出し、人力電界か大きく低下した場合には、受信機
にて発生する雑音が送信機２に送出されるのを防止する
ために、信号抑制部１３によって送信機２への出力を禁
止する。次に、送信機２は、受信機１よりの入力信弓に
対して、信号検出部２１の検波器１） Ｅ’Ｔ”によっ
て信号を検波し、検波出力から入力信月の有無を電圧比
較器ＣＯＭＰにより検出し、受信機１が出力をカットす
るのと同時にスケルチ発振部２２を作動させ、送信部２
３によって無変調波を送出する。In the embodiment shown in FIG. 1, an input signal is received by a receiving section 11 of a receiver 1, and an A. The GC section 12 performs automatic gain control, detects a drop in the receiving input electric field using the AGC control voltage, and when the human-powered electric field significantly decreases, the noise generated in the receiver is prevented from being sent to the transmitter 2. In order to prevent this, the signal suppressing unit 13 prohibits output to the transmitter 2. Next, the transmitter 2 detects a signal in response to the input signal from the receiver 1 using the detector 1) E'T'' of the signal detection unit 21, and compares the voltage to determine whether there is an input signal from the detection output. The squelch oscillator 22 is activated at the same time as the receiver 1 cuts the output, and the transmitter 2
3 to send out an unmodulated wave.
このように本実施例によれば、無線送受信装置の送信機
２側に入力信号の有無を検出する信号検出部２１を設け
たことで、受信機１からスケルチ制御信号をうけること
なくスケルチ発振部２２の制御を行うことができるよう
になる。故に、送受信機２．１間に制御線の配線を必要
としなくなり、構造的にも工事上からも安価になる。As described above, according to this embodiment, by providing the signal detection section 21 for detecting the presence or absence of an input signal on the transmitter 2 side of the wireless transmitting/receiving device, the squelch oscillation section can be operated without receiving a squelch control signal from the receiver 1. 22 controls can be performed. Therefore, there is no need to wire a control line between the transmitter and receiver 2.1, and the cost is reduced both in terms of structure and construction.
以上説明したように本発明のスケルチ方式は、入力信号
の有無を送信機側ても検出することができるようにした
ため、受信機から送信機への制御信号を必要とせず、受
信機と送信機との間の制御線の配線を不用なものとする
事ができ、局舎においては送信機と受信機との間の制御
線配線工事が必要なくなり、経済的にも構造的にも簡素
化がはかれる効果がある。As explained above, the squelch method of the present invention enables the presence or absence of an input signal to be detected on the transmitter side as well, so there is no need for a control signal from the receiver to the transmitter, and the This eliminates the need for control line wiring between the transmitter and receiver at the station building, and simplifies the structure both economically and structurally. It has a measurable effect.
第１図は本発明の一実施例のブロック図、第２図は従来
のスケルチ方式の一例のブロック図である。
１・・・受信機、２・・・送信機、１１・・・受信部、
１２・・・ＡＧＣ部、１３・・・信号抑制部、２１・・
信号検出部、２２・・・スケルチ発振部、２３・・・送
信部。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional squelch system. 1... Receiver, 2... Transmitter, 11... Receiving section,
12... AGC section, 13... Signal suppression section, 21...
Signal detection section, 22... Squelch oscillation section, 23... Transmission section.
Claims (2)
いとき出力を禁止する信号抑制部を備えた受信機と、こ
の受信機からの入力の有無を判定する信号検出部及びこ
の信号検出部が入力無と判定したとき作動するスケルチ
発振部を備えた送信機とを具備することを特徴とするス
ケルチ方式。(1) A receiver equipped with a signal suppression section that prohibits output when the received input level is lower than a predetermined level, a signal detection section that determines whether or not there is an input from this receiver, and a signal detection section that determines whether or not there is an input from this receiver. A squelch method comprising: a transmitter equipped with a squelch oscillator that operates when it is determined that
と、この検波器の検波出力電圧をあらかじめ定めた電圧
と比較する比較器とを有する請求項１記載のスケルチ方
式。(2) The squelch system according to claim 1, wherein the signal detection section includes a detector for detecting the input from the receiver, and a comparator for comparing the detected output voltage of the detector with a predetermined voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19551489A JPH0358630A (en) | 1989-07-27 | 1989-07-27 | Squelch system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19551489A JPH0358630A (en) | 1989-07-27 | 1989-07-27 | Squelch system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0358630A true JPH0358630A (en) | 1991-03-13 |
| JPH059971B2 JPH059971B2 (en) | 1993-02-08 |
Family
ID=16342347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19551489A Granted JPH0358630A (en) | 1989-07-27 | 1989-07-27 | Squelch system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0358630A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539781A (en) * | 1993-12-14 | 1996-07-23 | Nec Corporation | Combining diversity apparatus with squelch function |
-
1989
- 1989-07-27 JP JP19551489A patent/JPH0358630A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539781A (en) * | 1993-12-14 | 1996-07-23 | Nec Corporation | Combining diversity apparatus with squelch function |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059971B2 (en) | 1993-02-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |