JPS5950139U - squelch circuit - Google Patents
squelch circuitInfo
- Publication number
- JPS5950139U JPS5950139U JP1982143343U JP14334382U JPS5950139U JP S5950139 U JPS5950139 U JP S5950139U JP 1982143343 U JP1982143343 U JP 1982143343U JP 14334382 U JP14334382 U JP 14334382U JP S5950139 U JPS5950139 U JP S5950139U
- Authority
- JP
- Japan
- Prior art keywords
- detection means
- signal
- output
- squelch circuit
- output signal
- 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
- Transceivers (AREA)
- Noise Elimination (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のスケルチ回路のブロック図、第２図は本
考案の一実施例を示すブロック図、第３図は本考案の一
実施例の作用を示すタイミング図、第４図は本考案の他
の実施例を示すブロック図、第５図は本考案の他の実施
例の作用を示すタイミング図である。
１・・・音声信号復調回路、２・・・ノイズ増幅器、３
および１′０・・・検波回路、４′・・・ゲート回路、
５・・・前置増幅器、６・・・ＡＴＩＳ信号復調回路、
７・・・ＡＴＩＳ信号検出端子、８・・・ナントゲート
、９・・・中間増幅器、１１・・・アンドゲート。
第３図
第４図Fig. 1 is a block diagram of a conventional squelch circuit, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a timing diagram showing the operation of an embodiment of the present invention, and Fig. 4 is a block diagram of the present invention. FIG. 5 is a block diagram showing another embodiment of the present invention, and FIG. 5 is a timing diagram showing the operation of another embodiment of the present invention. 1... Audio signal demodulation circuit, 2... Noise amplifier, 3
and 1'0...detection circuit, 4'...gate circuit,
5... Preamplifier, 6... ATIS signal demodulation circuit,
7...ATIS signal detection terminal, 8...Nands gate, 9...Intermediate amplifier, 11...AND gate. Figure 3 Figure 4
Claims (1)
路であって、自動送信識別システム信号の受信中出力を
発生する第１の検出手段と、復調音声信号中のノイズを
検出する第２の検出手段または入感信号レベルが所定レ
ベル以下であることを検出する第３の検出手段と、第１
の検出手段の出力信号と第２または第３の検出手段の出
力信号とを入力として出力で復調音声出力信号をゲート
するトランスミッションゲート回路を制御して通話中の
みトランスミッションゲートを開く論理ゲート回路とを
備えてなることを特徴とするスケルチ回路。A squelch circuit for a radio communication device using an automatic transmission identification system, the first detection means generating an output during reception of an automatic transmission identification system signal, and the second detection means detecting noise in a demodulated audio signal. or a third detection means for detecting that the input signal level is below a predetermined level;
a logic gate circuit which controls a transmission gate circuit which inputs the output signal of the detection means and the output signal of the second or third detection means and gates the demodulated audio output signal at the output, and opens the transmission gate only during a call. A squelch circuit characterized by being equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982143343U JPS5950139U (en) | 1982-09-24 | 1982-09-24 | squelch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982143343U JPS5950139U (en) | 1982-09-24 | 1982-09-24 | squelch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5950139U true JPS5950139U (en) | 1984-04-03 |
Family
ID=30319982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982143343U Pending JPS5950139U (en) | 1982-09-24 | 1982-09-24 | squelch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5950139U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6019242U (en) * | 1983-07-15 | 1985-02-09 | 富士通テン株式会社 | squelch circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757660B2 (en) * | 1977-12-28 | 1982-12-06 | Nitsukiso Kk |
-
1982
- 1982-09-24 JP JP1982143343U patent/JPS5950139U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757660B2 (en) * | 1977-12-28 | 1982-12-06 | Nitsukiso Kk |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6019242U (en) * | 1983-07-15 | 1985-02-09 | 富士通テン株式会社 | squelch circuit |
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