JPH0644719B2 - Squelch circuit - Google Patents
Squelch circuitInfo
- Publication number
- JPH0644719B2 JPH0644719B2 JP60111196A JP11119685A JPH0644719B2 JP H0644719 B2 JPH0644719 B2 JP H0644719B2 JP 60111196 A JP60111196 A JP 60111196A JP 11119685 A JP11119685 A JP 11119685A JP H0644719 B2 JPH0644719 B2 JP H0644719B2
- Authority
- JP
- Japan
- Prior art keywords
- squelch
- tuning
- circuit
- radio wave
- adjusting
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はスケルチ回路に係わり、特に選局中のスケルチ
動作点を変更するスケルチ回路に関する。The present invention relates to a squelch circuit, and more particularly to a squelch circuit that changes a squelch operating point during channel selection.
従来のスケルチ回路は、受信信号に応じてスケルチ動作
点を調整するスケルチ調整手段が設けてあり、選局用ダ
イヤルを操作すると選局回路およびPLL回路を介してＩ
Ｆユニットが制御され、アンテナ、ＲＦユニットおよび
ＩＦユニットを経由して希望信号を選局し、さらに、こ
の選局により希望する信号を受信すると、前記スケルチ
回路はオン動作からオフ動作になり、前段の受信系回路
および後段のオーディオ系回路からなる主系路は正常に
動作する一方、前記スケルチ調整手段を操作して、希望
電波に対応した閾値設定をすることにより、無信号時の
雑音を消去できるようにしていた。The conventional squelch circuit is provided with squelch adjusting means for adjusting the squelch operating point according to the received signal. When the tuning dial is operated, the I
When the F unit is controlled and a desired signal is selected via the antenna, the RF unit and the IF unit, and the desired signal is received by this selection, the squelch circuit changes from ON operation to OFF operation. The main system path consisting of the receiving system circuit and the audio system circuit of the latter stage operates normally, while operating the squelch adjusting means and setting the threshold value corresponding to the desired radio wave, the noise at no signal is erased. I was able to do it.
しかし、上述のような従来技術においては、スケルチの
設定した閾値に係わる希望する電波受信から選局替えし
た時他の微弱な希望電波は受信できないものであった。However, in the conventional technique as described above, when the desired radio wave reception related to the threshold value set by the squelch is changed and the selected weak radio wave cannot be received.
本発明は、従来知られているようなスケルチ回路のこの
ような欠点を改良する目的でなされたものである。The present invention has been made with the object of remedying such a drawback of the squelch circuit as conventionally known.
受信状態によってスケルチの動作点を設定する第１のス
ケルチ調整手段と、選局手段の動作に応じてオン・オフ
するスイッチング手段と、該スイッチング手段がオンで
あれば、第１のスケルチ調整手段で設定したスケルチ動
作点を更に低レベルに調整するスケルチ調整手段と、を
具備し、最良のスケルチ状態から選局をすると第２のス
ケルチ調整手段で低レベルのスケルチ動作点に設定して
微弱電波まで受信検知できる構成である。First squelch adjusting means for setting an operating point of the squelch according to the reception state, switching means for turning on / off according to the operation of the tuning means, and if the switching means is on, the first squelch adjusting means The squelch adjusting means for adjusting the set squelch operating point to a further low level is provided, and when the station is tuned from the best squelch state, the second squelch adjusting means sets the squelch operating point at a low level to a weak radio wave. It is a configuration that can detect reception.
本発明をスケルチ回路の一実施例の図面に従って説明す
る。The present invention will be described with reference to the drawings of an embodiment of a squelch circuit.
スケルチ回路６の動作は、AGC電圧または雑音レベル等
から得られるスケルチ信号のレベルによって定められ
る。その動作点の閾値はスケルチ調整用可変抵抗器５で
調整する。そして、このスケルチ調整用可変抵抗５の調
整用ツマミ（図示せず）を時計方向に廻すとスケルチが
深くなり、逆に反時計方向に廻すとスケルチが浅くなっ
てスケルチ動作点は低くなり、更にスケルチを浅くする
と、前記スケルチ回路６は基準電位点に達してオフ動作
となり、スケルチは常に開いたままとなって主系路をオ
ン・オフするスケルチゲート７は動作しない。The operation of the squelch circuit 6 is determined by the level of the squelch signal obtained from the AGC voltage or the noise level. The threshold value of the operating point is adjusted by the squelch adjustment variable resistor 5. When the adjustment knob (not shown) of the squelch adjustment variable resistor 5 is turned clockwise, the squelch becomes deeper, and when it is turned counterclockwise, the squelch becomes shallower and the squelch operating point becomes lower. When the squelch is made shallow, the squelch circuit 6 reaches the reference potential point and is turned off, the squelch is always kept open, and the squelch gate 7 for turning on / off the main system path does not operate.
一方、スイッチ回路９は、抵抗R1、コンデンサC1および
トランジスタQ1で構成され、端子９ａはＸ−Ｘ′結線を
介して選局回路４の端子４ａと接続している。そして選
局ボタン２または選局ダイヤル１を操作すると、選局ボ
タン２の場合はRAM３に記憶された周波数情報により選
局回路４が動作し、また選局ダイヤル１の場合は選局ダ
イヤルの回転に対応して選局回路４が動作する。On the other hand, the switch circuit 9 is composed of a resistor R 1 , a capacitor C 1 and a transistor Q 1 , and the terminal 9a is connected to the terminal 4a of the tuning circuit 4 via an XX ′ connection. When the tuning button 2 or tuning dial 1 is operated, the tuning circuit 4 operates according to the frequency information stored in the RAM 3 in the case of the tuning button 2 and the rotation of the tuning dial in the case of the tuning dial 1. The tuning circuit 4 operates in response to.
さらにこの選局回路４が動作すると、前記端子４ａに前
記選局回路４が動作中の信号をスイッチ回路９の端子９
ａへ送出し、前記トランジスタQ1がオンとなって端子９
ｂは基準電位になる。そして、この端子９ｂは可変抵抗
器８およびＹ−Ｙ′結線を介してスケルチ回路６の端子
６ａに接続され、可変抵抗器８で定まる基準電位とな
り、選局回路４が復旧すると、前記スイッチ回路９はコ
ンデンサＣ１で定まる遅延時間経過すると復旧する。Furthermore, when the channel selecting circuit 4 is operated, the terminal 9 of the channel selection circuit 4 the switching circuit 9 the signal running on the terminal 4a
a, the transistor Q 1 is turned on, and the terminal 9
b becomes the reference potential. This terminal 9b is connected to the terminal 6a of the squelch circuit 6 through the variable resistor 8 and the YY 'connection, becomes the reference potential determined by the variable resistor 8, and when the tuning circuit 4 is restored, the switch circuit 9 is restored when the delay time determined by the capacitor C 1 elapses.
ここでスケルチ調整用可変抵抗器５で設定した閾値によ
って希望電波を受信中、他の希望電波を選局しようとす
ると、スケルチ感度は可変抵抗器８で設定した動作点に
下方修正されるので、他の希望電波が受信中の電波より
弱い場合でも希望する電波を選局できるものである。ま
た、選局が終了するとスイッチ回路９は遅延動作後復旧
するので、前受信信号より弱い電波の場合にはあらため
て可変抵抗５を再調整しスケルチ動作点を設定すればよ
い。また、可変抵抗器８は選局に応じて予かじめ適宜設
定しておくものである。Here, when the desired radio wave is being received by the threshold value set by the squelch adjustment variable resistor 5 and another desired radio wave is selected, the squelch sensitivity is corrected downward to the operating point set by the variable resistor 8. Even if other desired radio waves are weaker than the received radio wave, the desired radio wave can be selected. When the tuning is completed, the switch circuit 9 recovers after the delay operation. Therefore, in the case of a radio wave weaker than the previous reception signal, the variable resistor 5 may be readjusted again to set the squelch operating point. Further, the variable resistor 8 is set beforehand according to the channel selection.
本発明になるスケルチ回路は、通常の第１のスケルチ調
整手段の他に、選局手段の動作に応じてオン・オフする
スイッチング手段と、このスイッチング手段の動作に応
じて第１のスケルチ調整手段で調整されたスケルチ動作
点を更に低いスケルチ動作点に調整する第２のスケルチ
調整手段を設けたことによって、選局時の微弱電波の受
信検知にも対応できるものである。このため操作性が向
上し希望信号に対する選局中の閾値の設定が容易にでき
る効果がある。The squelch circuit according to the present invention includes, in addition to the normal first squelch adjusting means, a switching means that is turned on / off according to the operation of the channel selecting means, and a first squelch adjusting means according to the operation of the switching means. By providing the second squelch adjusting means for adjusting the squelch operating point adjusted in step 1 to a lower squelch operating point, it is possible to cope with the reception detection of a weak radio wave at the time of tuning. For this reason, operability is improved, and there is an effect that a threshold value during tuning for a desired signal can be easily set.
図面は、本発明を説明するためのブロック図である。 １……選局用ダイヤル、２……選局ボタン、３……RA
M、４……選局回路、５……スケルチ調整用可変抵抗
器、６……スケルチ回路、７……スケルチゲート、８…
…可変抵抗器、９……スイッチ回路、４ａ，６ａ，７
ａ，９ａ，９ｂ……端子、Ｃ1……コンデンサ、Ｒ1……
抵抗、Ｑ1……トランジスタ、Ｘ−Ｘ′・Ｙ−Ｙ′……
結線。The drawings are block diagrams for explaining the present invention. 1 ... tuning dial, 2 ... tuning button, 3 ... RA
M, 4 ... Tuning circuit, 5 ... Squelch adjustment variable resistor, 6 ... Squelch circuit, 7 ... Squelch gate, 8 ...
... Variable resistor, 9 ... Switch circuit, 4a, 6a, 7
a, 9a, 9b ...... terminal, C 1 ...... capacitor, R 1 ......
Resistance, Q 1 ...... transistor, X-X '· Y- Y' ......
Connection.
Claims (1)
手段と、受信状態に応じてスケルチ動作点を調整するス
ケルチ調整手段とを具備した無線通信機において、前記
選局手段から選局中はハイレベル信号を出力する制御信
号出力手段と、選局中のハイレベル信号が供給される時
定数回路と、該時定数回路の出力信号でオン・オフする
スイッチング手段によって、オン状態では前記スケルチ
調整手段の設定を更に低下させるスケルチ感度低下手段
とを備え、受信状態から選局操作を行うと自動的に前記
スイッチング手段をオンし、前記スケルチ感度低下手段
を駆動してスケルチ感度を低下させて微弱電波選局を可
能にし、選局が終了すると前記時定数回路の遅延後直ち
に選局前のスケルチ設定状態に復旧することを特徴とす
るスケルチ回路。1. A radio communication device comprising: a tuning unit provided to receive a desired radio wave; and a squelch adjusting unit adjusting a squelch operating point according to a reception state. In the ON state, the control signal output means for outputting a high level signal, the time constant circuit to which the high level signal during tuning is supplied, and the switching means for turning on / off by the output signal of the time constant circuit are used. Equipped with a squelch sensitivity lowering means for further lowering the setting of the squelch adjusting means, when the tuning operation is performed from the reception state, the switching means is automatically turned on, and the squelch sensitivity lowering means is driven to lower the squelch sensitivity. A squelch circuit that enables faint radio wave tuning and restores the squelch setting state before tuning immediately after the delay of the time constant circuit when tuning is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60111196A JPH0644719B2 (en) | 1985-05-23 | 1985-05-23 | Squelch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60111196A JPH0644719B2 (en) | 1985-05-23 | 1985-05-23 | Squelch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61269426A JPS61269426A (en) | 1986-11-28 |
| JPH0644719B2 true JPH0644719B2 (en) | 1994-06-08 |
Family
ID=14554931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60111196A Expired - Lifetime JPH0644719B2 (en) | 1985-05-23 | 1985-05-23 | Squelch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644719B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63111034U (en) * | 1987-01-12 | 1988-07-16 | ||
| JPH0434590Y2 (en) * | 1987-01-30 | 1992-08-18 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5561149A (en) * | 1978-10-31 | 1980-05-08 | Kokusai Electric Co Ltd | Squelch system for radio receiver |
| JPS5694843A (en) * | 1979-12-27 | 1981-07-31 | Matsushita Electric Ind Co Ltd | Receiving device |
| JPS59175230A (en) * | 1983-03-25 | 1984-10-04 | Nec Corp | Squelch sensitivity controller for mobile radio equipment |
-
1985
- 1985-05-23 JP JP60111196A patent/JPH0644719B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61269426A (en) | 1986-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4356567A (en) | Radio receiver with bandwidth switching | |
| US4924193A (en) | Volume control circuit for use in portable telephone or the like | |
| JPH0644719B2 (en) | Squelch circuit | |
| US20040096076A1 (en) | Hearing aid with a radio frequency receiver | |
| GB2052902A (en) | Radio receivers | |
| KR920008266Y1 (en) | Fm interference prevention circuit in six channel of tv receiver | |
| JP3396350B2 (en) | Diversity device for FM multiplex broadcasting receiver | |
| JPH0244417B2 (en) | ||
| US4349820A (en) | Tone signal decoder | |
| JPH0336109Y2 (en) | ||
| JP3163964B2 (en) | High frequency signal receiver | |
| JPS61269427A (en) | Squelch circuit | |
| JP2555131Y2 (en) | Squelch equipment | |
| JP3125122B2 (en) | How to set the gain of wireless communication equipment | |
| JPH0434577Y2 (en) | ||
| JPH0139004Y2 (en) | ||
| JPH08250945A (en) | Sound volume setting circuit | |
| JPS5924192Y2 (en) | Tuning accuracy setting device for automatic tuning circuit | |
| JPH026688Y2 (en) | ||
| JPS59175230A (en) | Squelch sensitivity controller for mobile radio equipment | |
| KR920004339Y1 (en) | Circuit for driving am/fm tuner respectively | |
| JPS6237854B2 (en) | ||
| US4107615A (en) | Receiver including an automatic tuning correction suppression circuit coupled to the tuning member | |
| US2061982A (en) | Automatic sensitivity reduction system | |
| JP3070988B2 (en) | Automatic tuning circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |