JPH0486342U - - Google Patents
Info
- Publication number
- JPH0486342U JPH0486342U JP13009390U JP13009390U JPH0486342U JP H0486342 U JPH0486342 U JP H0486342U JP 13009390 U JP13009390 U JP 13009390U JP 13009390 U JP13009390 U JP 13009390U JP H0486342 U JPH0486342 U JP H0486342U
- Authority
- JP
- Japan
- Prior art keywords
- scan
- time constant
- output signal
- determining means
- received wave
- 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.)
- Pending
Links
Landscapes
- Noise Elimination (AREA)
Description
第１図は本考案の実施例を示す構成図であり、
第２図は従来の無線機の構成を示す構成図である
。
図中、１……フロントエンド、２……中間周波
アンプ、３……復調回路、４……ローパスフイル
タ、５……アンプ、６……スピーカ、７……ハイ
パスフイルタ、２０……充放電回路、９……レベ
ル弁別回路、２１……マイコン。
FIG. 1 is a configuration diagram showing an embodiment of the present invention,
FIG. 2 is a block diagram showing the structure of a conventional radio device. In the figure, 1...Front end, 2...Intermediate frequency amplifier, 3...Demodulation circuit, 4...Low pass filter, 5...Amplifier, 6...Speaker, 7...High pass filter, 20...Charge/discharge circuit , 9... Level discrimination circuit, 21... Microcomputer.
Claims (1)
充放電回路と、該充放電回路の出力信号と基準値
とを比較することにより受信波の有無を判断する
判断手段と、該判断手段により受信波がないと判
断したときに受信部の出力信号を音声として出力
することを禁止するスケルチ回路において、 受信周波数を掃引し、前記判断手段により受信
波があると判断された時に受信周波数の掃引を停
止するスキヤン動作を行うスキヤン制御部と、 前記スキヤン制御部がスキヤン動作中であるか
否かを判断するスキヤン検知手段と、 該スキヤン検知手段がスキヤン中であると判断
すると前記時定数を小さくする時定数変更手段と
を備えたことを特徴とするスケルチ回路。[Claims for Utility Model Registration] A charging/discharging circuit that charges and discharges the output signal of the receiving section at a predetermined time constant, and determining the presence or absence of a received wave by comparing the output signal of the charging/discharging circuit with a reference value. A determining means and a squelch circuit that prohibits the output signal of the receiving section from being output as sound when the determining means determines that there is no received wave, the receiving frequency is swept, and the determining means determines that there is a received wave. a scan control unit that performs a scan operation to stop sweeping the received frequency when it is determined; a scan detection unit that determines whether the scan control unit is in the scan operation; and the scan detection unit is in the scan operation. and time constant changing means for reducing the time constant when it is determined that the squelch circuit has a time constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13009390U JPH0486342U (en) | 1990-11-30 | 1990-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13009390U JPH0486342U (en) | 1990-11-30 | 1990-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0486342U true JPH0486342U (en) | 1992-07-27 |
Family
ID=31877462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13009390U Pending JPH0486342U (en) | 1990-11-30 | 1990-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0486342U (en) |
-
1990
- 1990-11-30 JP JP13009390U patent/JPH0486342U/ja active Pending
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