JPH0485914U - - Google Patents
Info
- Publication number
- JPH0485914U JPH0485914U JP12830690U JP12830690U JPH0485914U JP H0485914 U JPH0485914 U JP H0485914U JP 12830690 U JP12830690 U JP 12830690U JP 12830690 U JP12830690 U JP 12830690U JP H0485914 U JPH0485914 U JP H0485914U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- level
- absence
- detects
- circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 1
Description
第１図は本考案に係る自動レベル調整回路の構
成図、第２図は動作状態を示す図、第３図は従来
技術の構成図、第４図は従来技術の動作状態を示
す図である。
２，３……増幅器、５……時定数回路、６……
信号有無検出回路、Ｃ１，Ｃ２，Ｃ３……コンデ
ンサ、Ｄ１，Ｄ２……ダイオード、Ｑ１，Ｑ２…
…トランジスタ、Ｑ３……トランジスタ（リセツ
ト回路）、Ｒ１〜Ｒ４……抵抗。
FIG. 1 is a block diagram of the automatic level adjustment circuit according to the present invention, FIG. 2 is a diagram showing the operating state, FIG. 3 is a block diagram of the prior art, and FIG. 4 is a diagram showing the operating state of the prior art. . 2, 3...Amplifier, 5...Time constant circuit, 6...
Signal presence detection circuit, C1, C2, C3... Capacitor, D1, D2... Diode, Q1, Q2...
...Transistor, Q3...Transistor (reset circuit), R1-R4...Resistor.
Claims (1)
のレベルがある一定以上にならないよう自動的に
レベル調整を行なう自動レベル調整回路において
、入力信号の有無を検出する信号有無検出回路と
、この信号有無検出回路が信号無しを検出したと
き自動レベル調整動作をリセツトするリセツト回
路を設けたことを特徴とする自動レベル調整回路
。 In an automatic level adjustment circuit that automatically adjusts the level so that the output signal level does not exceed a certain level even if the input signal level changes significantly, there is a signal presence/absence detection circuit that detects the presence or absence of an input signal, and a signal presence/absence detection circuit that detects the presence or absence of an input signal. An automatic level adjustment circuit comprising a reset circuit that resets automatic level adjustment operation when the detection circuit detects no signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12830690U JPH0485914U (en) | 1990-11-30 | 1990-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12830690U JPH0485914U (en) | 1990-11-30 | 1990-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0485914U true JPH0485914U (en) | 1992-07-27 |
Family
ID=31875773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12830690U Pending JPH0485914U (en) | 1990-11-30 | 1990-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0485914U (en) |
-
1990
- 1990-11-30 JP JP12830690U patent/JPH0485914U/ja active Pending