JPH033900U - - Google Patents
Info
- Publication number
- JPH033900U JPH033900U JP6499289U JP6499289U JPH033900U JP H033900 U JPH033900 U JP H033900U JP 6499289 U JP6499289 U JP 6499289U JP 6499289 U JP6499289 U JP 6499289U JP H033900 U JPH033900 U JP H033900U
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- circuit
- frequency characteristic
- impedance value
- directivity
- 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
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図は本考案の実施例に係るマイクロホン回
路の回路図、第２図は録音装置の回路図、第３図
は従来例のマイクロホン回路の回路図、第４図は
マイクロホン回路の周波数特性を示す図である。
ＺＭＣ……ズームマイクロホン、ＶＲ……指向
性調整信号出力回路、ＦＣ……周波数特性設定回
路、ＡＣ……増幅度設定回路、ＯＡ……オペレー
シヨナルアンプ、ＫＣ１……周波数特性切換回路
、ＫＣ２……増幅度切換回路。
Fig. 1 is a circuit diagram of a microphone circuit according to an embodiment of the present invention, Fig. 2 is a circuit diagram of a recording device, Fig. 3 is a circuit diagram of a conventional microphone circuit, and Fig. 4 shows the frequency characteristics of the microphone circuit. FIG. ZMC...Zoom microphone, VR...Directivity adjustment signal output circuit, FC...Frequency characteristic setting circuit, AC...Amplification degree setting circuit, OA...Operational amplifier, KC1...Frequency characteristic switching circuit, KC2... Amplification switching circuit.
Claims (1)
される指向性可変型マイクロホンからの音声信号
が一方の入力部に与えられるオペレーシヨナルア
ンプと、 前記オペレーシヨナルアンプの一方の入力部と
前記指向性可変型マイクロホンの出力部との間に
接続され、当該オペレーシヨナルアンプの低域側
周波数特性に対応した第１のインピーダンス値に
設定された周波数特性設定回路と、 同じく前記オペレーシヨナルアンプの他方の入
力部側に挿入され、当該オペレーシヨナルアンプ
の増幅度に対応した第２のインピーダンス値に設
定された増幅度設定回路と を備えたマイクロホン回路において、 前記周波数特性設定回路内に設けられて、かつ
前記指向性調整信号の入力レベルに応じて前記第
１のインピーダンス値を切り換える周波数特性切
換回路と、 前記増幅度設定回路内に設けられて、かつ前記
指向性調整信号の入力レベルに応じて前記第２の
インピーダンス値を切り換える増幅度切換回路と
、 を備えたマイクロホン回路。[Claims for Utility Model Registration] An operational amplifier whose one input section receives an audio signal from a variable directivity microphone whose directivity is varied in response to input of a directivity adjustment signal; and the operational amplifier. a frequency characteristic setting circuit connected between one input section of the directional variable microphone and an output section of the variable directivity microphone, the frequency characteristic setting circuit being set to a first impedance value corresponding to the low frequency characteristic of the operational amplifier; and an amplification degree setting circuit which is also inserted into the other input section side of the operational amplifier and is set to a second impedance value corresponding to the amplification degree of the operational amplifier. a frequency characteristic switching circuit that is provided in the circuit and switches the first impedance value according to the input level of the directivity adjustment signal; and a frequency characteristic switching circuit that is provided in the amplification degree setting circuit and switches the first impedance value according to the input level of the directivity adjustment signal; an amplification switching circuit that switches the second impedance value according to an input level of the microphone circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6499289U JPH033900U (en) | 1989-06-02 | 1989-06-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6499289U JPH033900U (en) | 1989-06-02 | 1989-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH033900U true JPH033900U (en) | 1991-01-16 |
Family
ID=31596421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6499289U Pending JPH033900U (en) | 1989-06-02 | 1989-06-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH033900U (en) |
-
1989
- 1989-06-02 JP JP6499289U patent/JPH033900U/ja active Pending
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