JPH0452675B2 - - Google Patents
Info
- Publication number
- JPH0452675B2 JPH0452675B2 JP9755382A JP9755382A JPH0452675B2 JP H0452675 B2 JPH0452675 B2 JP H0452675B2 JP 9755382 A JP9755382 A JP 9755382A JP 9755382 A JP9755382 A JP 9755382A JP H0452675 B2 JPH0452675 B2 JP H0452675B2
- Authority
- JP
- Japan
- Prior art keywords
- voice coil
- speed
- speaker
- vibration
- signal
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Circuit For Audible Band Transducer (AREA)
Description
【発明の詳細な説明】
本発明は、磁束を横切るコイルに発生する起電
力の内、コイルの移動速度に正確に比例する信号
を特殊な演算回路によつて取り出し、歪の少い速
度センサーを構成しスピーカの電子制御に応用す
ることを目的とするものである。Detailed Description of the Invention The present invention uses a special arithmetic circuit to extract a signal that is accurately proportional to the moving speed of the coil out of the electromotive force generated in the coil that crosses the magnetic flux, thereby creating a speed sensor with less distortion. The purpose is to construct and apply it to electronic control of speakers.
第１図は従来の振動速度を検出するようにした
スピーカの構造を示す図で、プレート１，３、マ
グネツト２、駆動用ボイスコイル８からなるスピ
ーカ駆動部とは別に、プレート１０，１２、マグ
ネツト１１、ボイスコイル８と連動する検出用ボ
イスコイル１３から振動速度検出部を設けてい
る。４はフレーム、５はエツジ、６は振動板、７
はダンパ、９はボイスコイルボビンである。 FIG. 1 is a diagram showing the structure of a conventional speaker designed to detect vibration speed. 11. A vibration speed detecting section is provided from the detection voice coil 13 which is interlocked with the voice coil 8. 4 is the frame, 5 is the edge, 6 is the diaphragm, 7
9 is a damper, and 9 is a voice coil bobbin.
上記構成において、速度検出用ボイスコイル１
３はスピーカの駆動用ボイスコイル８と連動して
いるので、スピーカの振動に応じて速度に比例し
た起電力を発生し、これをスピーカの制御に利用
しているが、振動方向の磁界の不均一によつて速
度検出コイルに発生する信号はスピーカの速度に
対して歪んだ信号が発生し、この信号を利用して
スピーカの制御を行つてもその制御効果には限界
があつた。 In the above configuration, the speed detection voice coil 1
3 is interlocked with the voice coil 8 for driving the speaker, so it generates an electromotive force proportional to the speed in response to the vibration of the speaker, and this is used to control the speaker. Due to the uniformity, the signal generated in the speed detection coil is distorted with respect to the speed of the speaker, and even if this signal is used to control the speaker, there is a limit to the control effect.
本発明は、このような従来のスピーカの欠点を
解消しようとするものである。 The present invention attempts to eliminate these drawbacks of conventional speakers.
第２図は本発明によるボイスコイルで、１４，
１５はそれぞれボイスコイル１３の上端、下端に
設けたサーチコイルであり、第２図の如く配線す
るとボイスコイルの上端からでる磁束φ1と下端
から入る磁束φ2において
Δe＝dφ3／dt＝ｄ（φ1−φ2）／dt −
なる電圧が検出され、ボイスコイルを横切る磁束
φ3に比例した電圧が発生する。 FIG. 2 shows a voice coil according to the present invention, 14,
Reference numerals 15 denote search coils installed at the upper and lower ends of the voice coil 13, respectively. When wired as shown in Fig. 2, the magnetic flux φ 1 coming out from the upper end of the voice coil and the magnetic flux φ 2 entering from the lower end result in Δe=dφ 3 /dt=d A voltage of (φ 1 −φ 2 )/dt − is detected, and a voltage proportional to the magnetic flux φ 3 crossing the voice coil is generated.
一方ボイスコイル１３の両端に発生する電圧ｅ
は
ｅ＝Blv −
但し
Ｂ；検出界磁部の平均磁束
ｌ；ボイスコイル１３の全長
ｖ；ボイスコイル１３の振動速度
式で示されるが、実際には前述の如く検出界
磁部の磁速は、振動方向に対して非対称であるた
めその歪成分をΔBとすると式に示す電圧が発
生して
ｅ＝Blv＋ΔBlv −
いる。又ΔBlは前述のボイスコイルを横切る磁速
φ3に相当する。 On the other hand, the voltage e generated across the voice coil 13
is expressed as e=Blv - where B; average magnetic flux l of the detection field section; total length v of the voice coil 13; vibration speed of the voice coil 13. However, in reality, as mentioned above, the magnetic velocity of the detection field section is Since it is asymmetrical with respect to the vibration direction, if the distortion component is ΔB, a voltage is generated as shown in the equation: e=Blv+ΔBlv −. Further, ΔBl corresponds to the magnetic velocity φ 3 across the voice coil described above.
又式からΔe＝ｄ（φ1−φ2）／dt＝dΔBl／dt
を積分して
es＝∫Δldt＝∫dΔBl／dt＝ΔBl −
この様にして得られる電圧ｅ及びesを第３図に
示す如く演算するとBlvなる無歪の速度成分だけ
検出できる。以下に演算の方法を第３図と共に説
明する。 Also, by integrating Δe=d(φ 1 −φ 2 )/dt=dΔBl/dt from the formula, e s =∫Δldt=∫dΔBl/dt=ΔBl − The voltages e and e s obtained in this way are expressed as the third By calculating as shown in the figure, only the undistorted velocity component Blv can be detected. The calculation method will be explained below with reference to FIG.
第３図で１６，１９は減算器、１７は掛算器、
１８はＫ倍の利得をもつ増幅器である。 In Figure 3, 16 and 19 are subtracters, 17 is a multiplier,
18 is an amplifier with a gain of K times.
ｅ＝ｖ（Bl＋ΔBl） es＝ΔBlなる電圧を印加
すると18の出力ep′は
（ｅ−ep′）×es×Ｋ＝ep′ −
∴ep′＝ｅ／１＋１／esＫ＝ｖ（Bl＋ΔBl）／１＋１／
ΔBlK−
Ｋ＝１／Blになるべく18の利得を調整すると
ep′＝ｖ（Bl＋ΔBl）／ΔBl＋Bl・ΔBl＝ΔBlv −
従つて19の出力epは
ep＝ｖ（Bl＋ΔBl）−ΔBlv＝Blv −
以上のようにして得られた信号epは、スピーカ
の振動速度ｖに定数Bl倍しただけの信号である
からこれを元にスピーカの速度、振幅、加速度な
どの制御を行うことができる。 When a voltage of e=v(Bl+ΔBl) e s =ΔBl is applied, the output e p ′ of 18 is (e−e p ′)×e s ×K=e p ′ − ∴e p ′=e/1+1/e s K=v(Bl+ΔBl)/1+1/
ΔBlK− Adjust the gain of 18 as much as possible so that K=1/Bl, e p ′=v(Bl+ΔBl)/ΔBl+Bl・ΔBl=ΔBlv − Therefore, the output e p of 19 is e p =v(Bl+ΔBl)−ΔBlv =Blv − The signal e p obtained as described above is a signal obtained by multiplying the vibration speed v of the speaker by a constant Bl, and therefore, the speed, amplitude, acceleration, etc. of the speaker can be controlled based on this signal.
第４図は速度帰還した場合の一実施例である。 FIG. 4 shows an example in the case of speed feedback.
ボイスコイル１３の起電力をバランス入力で受
けて減算器２２の出力にｅ、サーチコイル１４，
１５の差分を積分器２３で積分しesを得て、前述
の如く演算すると減算器１９の出力には速度に比
例した信号が得られ、これを入力に帰還するとス
ピーカ２１の速度を制御することができる。 e, search coil 14,
15 is integrated by the integrator 23 to obtain e s , and when calculated as described above, a signal proportional to the speed is obtained at the output of the subtractor 19, and when this is fed back to the input, the speed of the speaker 21 is controlled. be able to.
以上の如く本発明によると、従来コイル型速度
検出器で無対策であつた非直線性を大幅に改善
し、無歪の速度検出器を構成し、スピーカなどの
振動の制御に役立てることができる。とともに、
本発明では帰還コイルによらず、速度検出用ボイ
スコイルとサーチコイルの検出信号を演算回路を
介してスピーカボイスコイル駆動用増幅器の帰還
回路に帰還しているため、消費電力も少なく、か
つ安価に構成することができる。 As described above, according to the present invention, it is possible to significantly improve non-linearity, which was unmeasured in conventional coil-type speed detectors, to configure a distortion-free speed detector, and to make it useful for controlling vibrations of speakers, etc. . With,
In the present invention, the detection signals of the speed detection voice coil and the search coil are fed back to the feedback circuit of the speaker voice coil driving amplifier via the arithmetic circuit without using a feedback coil, so power consumption is low and the cost is low. Can be configured.
第１図は従来のスピーカの構造を示す図、第２
図は本発明によるボイスコイルを示す図、第３図
は本発明による演算回路を示す図、第４図は速度
帰還させた場合の演算回路を示す図である。
１，３……駆動部プレート、２，１１……マグ
ネツト、４……フレーム、５……エツジ、６……
振動板、７……ダンパ、８……駆動用ボイスコイ
ル、９……ボイスコイルボビン、１０，１２……
検出部プレート、１３……検出用ボイスコイル、
１４……サーチコイル、１５……サーチコイル、
１６，１９，２０，２２……減算器、２３……積
分器、１７……掛算器、１８……増幅器、２１…
…スピーカ。
Figure 1 shows the structure of a conventional speaker, Figure 2 shows the structure of a conventional speaker.
3 is a diagram showing a voice coil according to the present invention, FIG. 3 is a diagram showing an arithmetic circuit according to the present invention, and FIG. 4 is a diagram showing an arithmetic circuit in the case of velocity feedback. 1, 3... Drive unit plate, 2, 11... Magnet, 4... Frame, 5... Edge, 6...
Vibration plate, 7... Damper, 8... Driving voice coil, 9... Voice coil bobbin, 10, 12...
Detection plate, 13...detection voice coil,
14...Search coil, 15...Search coil,
16, 19, 20, 22...subtractor, 23...integrator, 17...multiplier, 18...amplifier, 21...
...Speaker.
Claims (1)
イルによつて駆動されるスピーカの振動系と連動
し、振動速度に比例した起電力を発生する速度検
出用ボイスコイルと、前記速度検出用ボイスコイ
ルの両端に配置されて前記速度検出用ボイスコイ
ルの振動方向以外の方向に出入する磁束を検出す
る一対のサーチコイルを設け、前記速度検出用ボ
イスコイルに発生する振動速度に比例した信号と
前記サーチコイルに発生する検出信号を掛算器を
含む演算回路を介してスピーカの振動系の速度に
正確に比例した信号を取り出し、前記駆動用ボイ
スコイルを駆動する駆動回路の帰還回路へ加えた
ことを特徴とするスピーカ。1 A speed detection voice coil that generates an electromotive force proportional to the vibration speed in conjunction with the vibration system of the speaker driven by the driving voice coil that drives the diaphragm of the speaker; A pair of search coils are provided at both ends to detect magnetic flux flowing in and out in a direction other than the vibration direction of the speed detection voice coil, and a signal proportional to the vibration speed generated in the speed detection voice coil and the search coil are provided. A signal that is accurately proportional to the speed of the vibration system of the speaker is extracted from the detection signal generated by the signal through an arithmetic circuit including a multiplier, and is applied to a feedback circuit of a drive circuit that drives the drive voice coil. speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57097553A JPS58215197A (en) | 1982-06-09 | 1982-06-09 | Speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57097553A JPS58215197A (en) | 1982-06-09 | 1982-06-09 | Speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58215197A JPS58215197A (en) | 1983-12-14 |
| JPH0452675B2 true JPH0452675B2 (en) | 1992-08-24 |
Family
ID=14195427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57097553A Granted JPS58215197A (en) | 1982-06-09 | 1982-06-09 | Speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58215197A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2758532B2 (en) * | 1992-06-05 | 1998-05-28 | 三菱電機株式会社 | Sound equipment |
-
1982
- 1982-06-09 JP JP57097553A patent/JPS58215197A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58215197A (en) | 1983-12-14 |
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