JPH01314007A - microphone amplifier - Google Patents
microphone amplifierInfo
- Publication number
- JPH01314007A JPH01314007A JP63143722A JP14372288A JPH01314007A JP H01314007 A JPH01314007 A JP H01314007A JP 63143722 A JP63143722 A JP 63143722A JP 14372288 A JP14372288 A JP 14372288A JP H01314007 A JPH01314007 A JP H01314007A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- microphone
- sound
- gain
- same time
- 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
- Amplifiers (AREA)
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、特にビデオ一体型カメラに使用して好適なマ
イクロホン増巾器に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microphone amplifier particularly suitable for use in an integrated video camera.
従来の装置は１日立ビデオ一体型カメラ（ＶＭ −０３
０）に使用されたマイクロフォンの様にマイクロホンと
マイク増巾器間に７１イノ々スフイルメを設けていた。The conventional equipment is Hitachi video integrated camera (VM-03).
Like the microphone used in 0), a 71-inch filter was installed between the microphone and the microphone amplifier.
〔゛発明が解決しようとする課題」
上記従来技術は１虱ノイズ低減について配慮がされてお
らず、Ｓ／Ｎの点で問題があった、本発明の目的は、上
記問題点ｔ−解消し得るマイクロホンを提供することに
ある。[Problem to be Solved by the Invention] The above-mentioned conventional technology did not give consideration to noise reduction and had a problem in terms of S/N.The purpose of the present invention is to solve the above-mentioned problem t-. Our goal is to provide you with the microphone you want.
上記目的は、マイクロホン増巾器の帰還ｔを変える手段
を設けることにより、達成される。The above object is achieved by providing means for varying the feedback t of the microphone amplifier.
マイクロホン増巾器はターンオーバ周波数ヲモ低域及び
高域利得の低下した周波数特性をもつことができる。こ
れによって、風ノイズの低減力；図れる。The microphone amplifier can have a turnover frequency and a frequency characteristic with reduced low-frequency and high-frequency gains. This makes it possible to reduce wind noise.
以下１本発明の実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
同図において、マイクロホン１で受けた音は増巾器５で
増巾され、欠設の記録増巾器及びモニター増巾器に入る
。コンデンサ２．４はＤＯカップリングコンデンサであ
る。切換スイッチ６は増巾器３の帰還ｔｔ−切換える。In the figure, the sound received by the microphone 1 is amplified by the amplifier 5, and then enters the missing recording amplifier and monitor amplifier. Capacitor 2.4 is a DO coupling capacitor. The changeover switch 6 switches the feedback tt of the amplifier 3.
抵抗５，９．１１及びコンデンサ８は帰還回路を構成し
ている。コンデンサ１０．１２はＤＣカップリングコン
デンサであり。Resistors 5, 9.11 and capacitor 8 constitute a feedback circuit. Capacitors 10 and 12 are DC coupling capacitors.
コンデンサ１０は低域帰還量を変化させる働もきも有す
る。抵抗７は発蚤防止抵抗である。The capacitor 10 also has the function of changing the amount of low-frequency feedback. The resistor 7 is an anti-flea resistor.
斯る回路構成において、切換スイッチ６が８１側にある
場合増巾ａ３は帰還抵抗５．１１で決まる利得をもつ。In such a circuit configuration, when the selector switch 6 is on the 81 side, the amplification a3 has a gain determined by the feedback resistor 5.11.
又周波数特性はコンデンサ１２カニ充分大きければ゛音
声帯域内での周波数特性は平坦である。Also, if the capacitor 12 is sufficiently large, the frequency characteristics will be flat within the audio band.
久に、スイッチ６を８！側に切換えた場合は増巾器５は
抵抗５．９で決まる利得をもつ。この時抵抗９．１１の
抵抗値Ｒ，ｊ Ｒ１１をＲ，、＞Ｒ・とすれば、増巾器
３の利得を上げることができる。次に、コンデンサ１０
の容量Ｃ３゜を選ぶことによ’） Ｒｅ ＊ Ｏｔｏの
積で決まるターンオーバ周波数をもつ低域利得の低下し
た周波数特性を得ることができる。又コンデンサ８の容
量Ｃａｔ−選ぶことにより、Ｒ，、Ｏ，の槓で決まるタ
ーンオーバ周波数をもつ高域利得の低下した周波数特性
倉得ることができる。よって、第２図に示す様に１鵞な
る帯域通過フィルター４性ｔもつことができる。For a long time, switch 6 to 8! When switched to the side, the amplifier 5 has a gain determined by the resistor 5.9. At this time, the gain of the amplifier 3 can be increased by setting the resistance value R,j R11 of the resistor 9.11 to R, >R. Next, capacitor 10
By selecting the capacitance C3°, it is possible to obtain a frequency characteristic with a reduced low-frequency gain and a turnover frequency determined by the product of Re * Oto. Furthermore, by selecting the capacitance Cat of the capacitor 8, it is possible to obtain a frequency characteristic with a reduced high-frequency gain and a turnover frequency determined by the values of R, , O, and the like. Therefore, as shown in FIG. 2, it is possible to have four band-pass filters having one characteristic.
第２図のｈの周波数特性を得ることによってマイクロホ
ン収音時に生ずる。低域周波数帯にエネルギー分布？も
つ風ノイズを低減すると同時に。This occurs when the microphone picks up sound by obtaining the frequency characteristic h in FIG. Energy distribution in the low frequency band? At the same time, it reduces wind noise.
帯域曲過フィルターによる一改善と利得（マイクロホン
感度）の増加との相乗効果により、音声の明瞭度を改善
する。The synergistic effect of the improvement provided by the bandpass filter and the increase in gain (microphone sensitivity) improves speech intelligibility.
本発明によれば、風ノイズの改善と音声明瞭度改善効果
を同時に実現できる効果力；ある。According to the present invention, it is possible to simultaneously achieve the effect of improving wind noise and improving voice clarity.
第１図は本発明の一実施例の回路図、第２図は本実施例
の音声周波数特注図である。
１：マイクロホン。
２．４：カップリングコンデンサ、
５：マイクロホン増巾器。
６：切換スイッチ。
５．９，１１ ：帰還抵抗。
８：帰還コンデンサ。
１０．１２ ：カップリングコンデンサ。FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a custom-made audio frequency diagram of this embodiment. 1: Microphone. 2.4: Coupling capacitor, 5: Microphone amplifier. 6: Selector switch. 5.9, 11: Feedback resistance. 8: Feedback capacitor. 10.12: Coupling capacitor.
Claims (1)
回路を有し、音声周波数の低域及び高域を低下させる帯
域通過フィルタを構成すると同時に利得を変化させる機
能を得るための切換スイッチ手段を設けたことを特徴と
するマイクロホン増巾器。It has a variable feedback amplification circuit that changes the amount of feedback of the microphone amplifier, constitutes a bandpass filter that lowers the low and high frequencies of the audio frequency, and at the same time has a changeover switch means that obtains the function of changing the gain. A microphone amplifier characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143722A JPH01314007A (en) | 1988-06-13 | 1988-06-13 | microphone amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143722A JPH01314007A (en) | 1988-06-13 | 1988-06-13 | microphone amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01314007A true JPH01314007A (en) | 1989-12-19 |
Family
ID=15345472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63143722A Pending JPH01314007A (en) | 1988-06-13 | 1988-06-13 | microphone amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01314007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03135300A (en) * | 1989-10-20 | 1991-06-10 | Matsushita Electric Ind Co Ltd | Camera-integrated videotape recorder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575413A (en) * | 1980-06-13 | 1982-01-12 | Sony Corp | Tone quality adjuster |
| JPS5939600B2 (en) * | 1979-04-05 | 1984-09-25 | 古河電気工業株式会社 | How to ventilate a cave |
-
1988
- 1988-06-13 JP JP63143722A patent/JPH01314007A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5939600B2 (en) * | 1979-04-05 | 1984-09-25 | 古河電気工業株式会社 | How to ventilate a cave |
| JPS575413A (en) * | 1980-06-13 | 1982-01-12 | Sony Corp | Tone quality adjuster |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03135300A (en) * | 1989-10-20 | 1991-06-10 | Matsushita Electric Ind Co Ltd | Camera-integrated videotape recorder |
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