JPS58154909A - Amplifying circuit possible for variable gain control - Google Patents
Amplifying circuit possible for variable gain controlInfo
- Publication number
- JPS58154909A JPS58154909A JP57036376A JP3637682A JPS58154909A JP S58154909 A JPS58154909 A JP S58154909A JP 57036376 A JP57036376 A JP 57036376A JP 3637682 A JP3637682 A JP 3637682A JP S58154909 A JPS58154909 A JP S58154909A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- waveform
- keyboard
- conductor
- electromotive force
- 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
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
- G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
- G10H1/053—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、電子楽器等において、鍵盤を押す速度に対応
して出力音量を制御したい場合などに好適に用い得る可
変利得制御可能な増幅回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplifier circuit capable of variable gain control that can be suitably used in electronic musical instruments and the like where it is desired to control the output volume in accordance with the speed at which the keyboard is pressed.
従来の電子楽器においては、１個の鍵盤に対応して１個
のスイッチが用意され、鍵盤が押された状態ではスイッ
チはＯＮ、押されていない状態では（’） Ｆ Ｆとな
り、スイッチのＯＮ 、ＯＦＦによりスイッチング素子
を制御しているため、出力音の立ち上がり、立ち下がり
時間は可変であっても、出力音レベルは鍵盤を押す速度
とは無関係に一律で、本来楽器の持つ音色の強弱を実現
することはできなかった。In conventional electronic musical instruments, one switch is prepared for each keyboard, and when the key is pressed, the switch is ON, and when it is not pressed, it is (') F F, and the switch is ON. Since the switching element is controlled by turning OFF, even though the rise and fall times of the output sound are variable, the output sound level remains the same regardless of the speed at which the keyboard is pressed, and it does not affect the strength of the timbre of the instrument. I couldn't make it happen.
本発明の目的は、上記した従来技術の欠点をなくし、鍵
盤が押された速度に対応した音色の強弱を実現するのに
好適に用い得る可変利得制御可能な増幅回路を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a variable gain controllable amplifier circuit that can be suitably used to realize the strength of a tone corresponding to the speed at which a keyboard is pressed.
本発明は、発振出力を増幅して出力する増幅器と、コイ
ル状に形成された導体と、該導体に対して相対的に移動
し、その移動速度に比例した電磁誘導起電力を前記導体
に誘起する永久磁石と、誘起された前記起電力の大きさ
に従って前記増幅器の利得を制御する手段とにより上記
目的を達成したものである。The present invention provides an amplifier that amplifies and outputs an oscillation output, a conductor formed in a coil shape, and an electromagnetic induced electromotive force that moves relative to the conductor and is proportional to the speed of movement of the conductor. The above object has been achieved by a permanent magnet and means for controlling the gain of the amplifier according to the magnitude of the induced electromotive force.
図は本発明の一実施例を示す回路図である。The figure is a circuit diagram showing one embodiment of the present invention.
同図において、１はコイル状の導体、２は永久磁石、５
、４ 、１０．１１．１５．１５はそれぞれ抵抗５は
演算増幅器、６，８．１７はそれぞれコンテンサ、７は
検波用ダイオード、９はダイオード１２は可変抵抗用Ｆ
ＥＴ、１４は音源発振器、１６は演算増幅器、１８は出
力端子、である。In the figure, 1 is a coiled conductor, 2 is a permanent magnet, and 5 is a coiled conductor.
, 4, 10, 11, 15, and 15 are respectively resistors 5 is an operational amplifier, 6, 8, 17 are capacitors, 7 is a detection diode, 9 is a diode 12 is a variable resistor F
ET, 14 is a sound source oscillator, 16 is an operational amplifier, and 18 is an output terminal.
図において、コイル状をなす導体１に永久磁石２の作る
磁束が貫通しているとき、ファラデー、ノイマンの電磁
誘導の法則によシ、磁束の時間的変化により、導体内に
電磁誘導起電力が誘起される。本実施例の場合、導体１
は基板にプリントしたものであり、永久磁石２は図示せ
ざる鍵盤の裏面に接着されたものである０すなわち、導
体１に誘起される電磁誘導起電力は鍵盤を速く押せば大
きく、遅く押せば小さくなる。In the figure, when a magnetic flux generated by a permanent magnet 2 passes through a coiled conductor 1, according to Faraday and Neumann's laws of electromagnetic induction, an electromagnetic induced electromotive force is generated in the conductor due to temporal changes in the magnetic flux. induced. In this example, conductor 1
is printed on the board, and the permanent magnet 2 is glued to the back of the keyboard (not shown).In other words, the electromagnetic induced electromotive force induced in the conductor 1 increases when the keyboard is pressed quickly, and increases when the keyboard is pressed slowly. becomes smaller.
誘起された電圧を負帰還増幅器５で増幅し、ダイオード
７で半波整流した後、コンデンサー８に充電し、抵抗１
１及びダイオード９の内部抵抗を通して放電し平滑化し
、ＦＥＴ１２のゲート入力とする。抵抗１０．１１はＦ
ＥＴ１２の初期状態を遮断状態にしておくために、負の
バイアスをゲートに与えるためのものであり、ダイオー
ド９はコンデンサー８の初期電荷を零にしておくための
ものである。ＦＥＴ１２の導通状態におけるドレイン、
ソース間抵抗が可変抵抗領域に含まれるよう、ゲート入
力の電圧レベルを決定する０音源１４の波形はドレイン
、ソース間抵抗と抵抗１３で分圧され、負帰還増幅器１
６に入力される。The induced voltage is amplified by a negative feedback amplifier 5, half-wave rectified by a diode 7, charged into a capacitor 8, and then connected to a resistor 1.
1 and the internal resistance of the diode 9 to smooth it and input it to the gate of the FET 12. Resistance 10.11 is F
The diode 9 is used to apply a negative bias to the gate in order to keep the initial state of the ET 12 in a cut-off state, and the diode 9 is used to make the initial charge of the capacitor 8 zero. The drain of FET 12 in the conductive state,
The waveform of the zero sound source 14, which determines the gate input voltage level, is divided by the drain and source resistance and the resistor 13 so that the source-to-source resistance is included in the variable resistance region, and the negative feedback amplifier 1
6 is input.
負帰還増幅器１６の利得は、帰還抵抗１５とドレイン、
ソース間抵抗の比で決まるから、結局、ゲート入力電圧
で決定される。抵抗１３はＦＥＴ１２が遮断状態のとき
、負帰還増幅器１６の安定を計る役割も果す。以上のよ
うに音源１４の波形は電磁誘導起電力の大きさで決定さ
れる利得で負帰還増幅器１６で増幅される。本実施例に
よれば、鍵盤を押す速度に対応した出力音レベルが得ら
れ、コンデンサー８の放電時間だけ音源波形を減衰振動
させることができ、楽器本来のもつ音源波形のパターン
に擬似させることができる。The gain of the negative feedback amplifier 16 is determined by the feedback resistor 15, the drain,
Since it is determined by the ratio of the source-to-source resistance, it is ultimately determined by the gate input voltage. The resistor 13 also plays the role of stabilizing the negative feedback amplifier 16 when the FET 12 is in the cutoff state. As described above, the waveform of the sound source 14 is amplified by the negative feedback amplifier 16 with a gain determined by the magnitude of electromagnetic induced electromotive force. According to this embodiment, an output sound level corresponding to the speed at which the keyboard is pressed can be obtained, and the sound source waveform can be damped and oscillated by the discharge time of the capacitor 8, making it possible to simulate the pattern of the sound source waveform inherent in the musical instrument. can.
以上述べたように、本発明によれば、永久磁石とコイル
状導体との相対運動により惹起される電磁誘導起電力に
対応した電圧で増幅器の利得を制御するため、永久磁石
の運動する速度（鍵盤を押す速度）に対応した出力電力
を得ることができ、従って本発明は電子楽器等に用いて
好適であるという利点がおる０As described above, according to the present invention, since the gain of the amplifier is controlled by the voltage corresponding to the electromagnetic induced electromotive force induced by the relative movement between the permanent magnet and the coiled conductor, the speed at which the permanent magnet moves ( Therefore, the present invention has the advantage that it is suitable for use in electronic musical instruments, etc.
図は本発明の一実施例を示す回路図である。
符号説明
１・・・コイル状導体
２・・・電磁誘導起電力の誘起用永久磁石１２・・・可
変抵抗領域で使用するＦＥＴ１６・・・ＦＥＴのドレイ
ン、ソース間抵抗で利得が決定する負帰還増幅器用演算
増幅器The figure is a circuit diagram showing one embodiment of the present invention. Symbol explanation 1... Coiled conductor 2... Permanent magnet for inducing electromagnetic induced electromotive force 12... FET 16 used in the variable resistance region... Negative feedback whose gain is determined by the resistance between the drain and source of the FET operational amplifier for amplifier
Claims (1)
形成された導体と、該導体に対して相対的に移動し、そ
の移動速度に比例した電磁誘導起電力を前記導体に誘起
する永久磁石と、誘起された前記起電力の大きさに従っ
て前記増幅器の増幅利得を制御する利得制御手段とを有
して成ることを特徴とする可変利得制御可能な増幅回路
０1) An amplifier that amplifies and outputs the oscillation output, a conductor formed in a coil shape, and a permanent device that moves relative to the conductor and induces an electromagnetic induced electromotive force in the conductor that is proportional to the speed of movement. Variable gain controllable amplifier circuit 0 characterized by comprising a magnet and gain control means for controlling the amplification gain of the amplifier according to the magnitude of the induced electromotive force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57036376A JPS58154909A (en) | 1982-03-10 | 1982-03-10 | Amplifying circuit possible for variable gain control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57036376A JPS58154909A (en) | 1982-03-10 | 1982-03-10 | Amplifying circuit possible for variable gain control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58154909A true JPS58154909A (en) | 1983-09-14 |
Family
ID=12468123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57036376A Pending JPS58154909A (en) | 1982-03-10 | 1982-03-10 | Amplifying circuit possible for variable gain control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58154909A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414440A (en) * | 2013-08-14 | 2013-11-27 | 董志伟 | Signal amplification circuit with time-varying gain |
| WO2021100448A1 (en) * | 2019-11-20 | 2021-05-27 | ヤマハ株式会社 | Detection system, musical performance operating device, and keyboard instrument |
-
1982
- 1982-03-10 JP JP57036376A patent/JPS58154909A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414440A (en) * | 2013-08-14 | 2013-11-27 | 董志伟 | Signal amplification circuit with time-varying gain |
| WO2021100448A1 (en) * | 2019-11-20 | 2021-05-27 | ヤマハ株式会社 | Detection system, musical performance operating device, and keyboard instrument |
| JPWO2021100448A1 (en) * | 2019-11-20 | 2021-05-27 |
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