JPH03107895U - - Google Patents
Info
- Publication number
- JPH03107895U JPH03107895U JP1618690U JP1618690U JPH03107895U JP H03107895 U JPH03107895 U JP H03107895U JP 1618690 U JP1618690 U JP 1618690U JP 1618690 U JP1618690 U JP 1618690U JP H03107895 U JPH03107895 U JP H03107895U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- microphone
- main audio
- input
- 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 4
- 230000005236 sound signal Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 1
Description
第１図は本考案によるマイク入力自動調整回路
の一実施例を示すブロツク図、第２図は第１図の
マイク入力自動調整回路の一部を構成するミキシ
ング回路を示す回路図、第３図は他の実施例のミ
キシング回路を示す回路図、第４図は従来回路例
を示すブロツク図、第５図は従来のミキシング回
路を示す回路図である。
１…マイクロフオン、３…マイク増幅器、４…
マイクボリユーム、７…サウンドコントロール回
路、９ａ，９ｂ…オペアンプ、１２…サウンドパ
ワー増幅器、１３ａ，１３ｂ…スピーカ、１４，
２３…ミキシング回路、１５…バツフア回路、１
６…フイルタ回路、１７…増幅器、１８…比較回
路、２０…マイク入力自動調整切換えスイツチ、
２１ａ，２１ｂ…制御トランジスタ、Ｒ１ａ，Ｒ
１ｂ，Ｒ２ａ，Ｒ２ｂ，Ｒ７ａ，Ｒ７ｂ…減衰用
の抵抗。
FIG. 1 is a block diagram showing an embodiment of the microphone input automatic adjustment circuit according to the present invention, FIG. 2 is a circuit diagram showing a mixing circuit forming a part of the microphone input automatic adjustment circuit of FIG. 1, and FIG. is a circuit diagram showing a mixing circuit of another embodiment, FIG. 4 is a block diagram showing an example of a conventional circuit, and FIG. 5 is a circuit diagram showing a conventional mixing circuit. 1... Microphone, 3... Microphone amplifier, 4...
Microphone volume, 7... Sound control circuit, 9a, 9b... Operational amplifier, 12... Sound power amplifier, 13a, 13b... Speaker, 14,
23...Mixing circuit, 15...Buffer circuit, 1
6... Filter circuit, 17... Amplifier, 18... Comparison circuit, 20... Microphone input automatic adjustment switch,
21a, 21b...control transistor, R1a, R
1b, R2a, R2b, R7a, R7b...Resistors for damping.
Claims (1)
声信号に該マイク信号をミキシングするミキシン
グ回路と、 このミキシング回路に入力される上記マイク信
号の有無を検出する信号検出回路と、 上記ミキシング回路に入力される上記主音声信
号のゲインを上記信号検出回路の検出出力に基づ
いて変化させるゲインコントロール回路とを備え
、 上記信号検出回路でマイク信号が有りと検出さ
れたときに、上記ゲインコントロール回路により
主音声信号のゲインを下げるかゼロにし、上記ミ
キシング回路に入力されるマイク信号を強調する
ことを特徴とするマイク入力自動調整回路。[Claims for Utility Model Registration] A mixing circuit that receives a main audio signal and a microphone signal and mixes the microphone signal with the main audio signal, and a signal that detects the presence or absence of the microphone signal that is input to the mixing circuit. a detection circuit; and a gain control circuit that changes the gain of the main audio signal input to the mixing circuit based on the detection output of the signal detection circuit, and the signal detection circuit detects that a microphone signal is present. An automatic microphone input adjustment circuit, wherein the gain control circuit lowers or makes the gain of the main audio signal zero, and emphasizes the microphone signal input to the mixing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1618690U JPH03107895U (en) | 1990-02-22 | 1990-02-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1618690U JPH03107895U (en) | 1990-02-22 | 1990-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03107895U true JPH03107895U (en) | 1991-11-06 |
Family
ID=31519469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1618690U Pending JPH03107895U (en) | 1990-02-22 | 1990-02-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03107895U (en) |
-
1990
- 1990-02-22 JP JP1618690U patent/JPH03107895U/ja active Pending
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