JPH0732508B2 - Speaker device - Google Patents
Speaker deviceInfo
- Publication number
- JPH0732508B2 JPH0732508B2 JP20135282A JP20135282A JPH0732508B2 JP H0732508 B2 JPH0732508 B2 JP H0732508B2 JP 20135282 A JP20135282 A JP 20135282A JP 20135282 A JP20135282 A JP 20135282A JP H0732508 B2 JPH0732508 B2 JP H0732508B2
- Authority
- JP
- Japan
- Prior art keywords
- speaker
- diaphragm
- microphone
- feedback
- frequency
- 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明はスピーカ装置に関するものである。TECHNICAL FIELD The present invention relates to a speaker device.
従来例の構成とその問題点 従来スピーカにモーショナルフィードバック（以下MFB
という）をかけるには、第１図に示すようにスピーカユ
ニット２に振動検出器３を取付け、その検出信号を帰還
回路４を介して電力増幅器１の反転入力に帰還してい
た。ところが、スピーカユニット２の振動板に振動検出
器３を取付けるとスピーカユニット２の振動特性が変化
し、特に高音用スピーカでは振動系の重量が非常に軽
く、検出器３を取付けた時の重量増加が大きいため著し
い能率低下を招き、さらには検出器３の高域検出限界周
波数での鋭い共振峰が発生して位相回りが大きく、これ
らのため高音用スピーカに帰還をかけることは不可能と
されていた。Configuration of conventional example and its problems Motional feedback (hereinafter referred to as MFB)
The vibration detector 3 is attached to the speaker unit 2 as shown in FIG. 1, and the detection signal is fed back to the inverting input of the power amplifier 1 via the feedback circuit 4. However, when the vibration detector 3 is attached to the diaphragm of the speaker unit 2, the vibration characteristics of the speaker unit 2 change, and particularly in the case of a high-pitched speaker, the weight of the vibration system is very light and the weight increase when the detector 3 is attached. Is large, the efficiency is remarkably lowered, and a sharp resonance peak at the high detection limit frequency of the detector 3 is generated to cause a large phase rotation. Therefore, it is impossible to feed back to the high frequency speaker. Was there.
また、実開昭55−152786号公報には、センターキャップ
が振動することにより同センターキャップの背面の空気
圧が振動し、これを音として検出するセンサーを備えた
コーン形スピーカが記載されているが、このような構成
においてはセンターキャップの背面の小空間での空気歪
を多分に含んだ振動検出となり、フィードバックといっ
ても周波数特性の制御はできても歪を含めたリニアリテ
ィーの改善は不可能であった。Further, Japanese Utility Model Laid-Open No. 55-152786 discloses a cone-shaped speaker provided with a sensor that detects air as a sound by vibrating the air pressure on the back surface of the center cap by vibrating the center cap. In such a configuration, vibration detection that includes air distortion in the small space on the back surface of the center cap is likely to occur, and it is impossible to improve linearity including distortion even if the frequency characteristic can be controlled as feedback. Met.
また、特開昭55−153495号公報には、ボイスコイルボビ
ンの振動距離に応じた光線量を検出して振動系の振幅検
出を行うセンサーを備えたコーン形スピーカが記載され
ているが、高音においては振幅が極めて小さく、振幅検
出が不可能であり、高周波数まで帰還をかけるとノイズ
が増加し、高音用スピーカでは実用に供しないものであ
った。Further, JP-A-55-153495 discloses a cone-shaped speaker equipped with a sensor for detecting the amount of light beam according to the vibration distance of a voice coil bobbin to detect the amplitude of a vibration system. Has a very small amplitude, amplitude detection is impossible, and noise is increased when feedback is applied up to a high frequency, which is not practical for a high frequency speaker.
発明の目的 この発明の目的は、前記諸問題を生じることなく高音用
スピーカにMFBをかけることができるスピーカ装置を提
供することである。OBJECT OF THE INVENTION An object of the present invention is to provide a speaker device capable of applying MFB to a high frequency speaker without causing the above-mentioned problems.
発明の構成 この発明は高音用スピーカの振動板の中央に孔部を設
け、この孔部に帰還用マイクロホンを設けたものであ
る。これにより、マイクロホンが振動板に対して非接触
のため前記問題を招来することなく高音用スピーカにMF
Bをかけることができる。しかも、振動板が再生する音
圧をほぼその音響中心で検出するので、マイクロホンに
よる検出信号と振動板による音源との位相差を最小にで
き、振動板から放射された音を忠実に検出することがで
きる。Structure of the Invention According to the present invention, a hole portion is provided in the center of a diaphragm of a high frequency speaker, and a return microphone is provided in the hole portion. As a result, since the microphone is not in contact with the diaphragm, the MF speaker can be used without causing the above problems.
You can multiply B. Moreover, since the sound pressure reproduced by the diaphragm is detected almost at its acoustic center, the phase difference between the detection signal from the microphone and the sound source from the diaphragm can be minimized, and the sound emitted from the diaphragm can be detected faithfully. You can
実施例の説明 この発明の一実施例を第２図ないし第４図に示す。すな
わち、第２図は高音用スピーカ（以下ツィータと称す）
の断面を示し、平面振動板６の中央部に孔6aを設け、マ
イクロホン５をその孔6aに配置し、マイクロホン５の出
力ケーブル5aをパイプ12を通して取出すようにしてい
る。７はエッジ、８はフレーム、９はトッププレート、
10はマグネット、11はヨーク、13はボイスコイルであ
る。このように構成すると、マイクロホン５が無指向性
マイクロホンであれば振動板６が再生する音圧をほぼそ
の音響中心で検出することになり、マイクロホン５の検
出信号と振動板６による音源との位相差は最少にするこ
とができ、振動板６から放射され音を忠実に検出するこ
とができる。更には、振動板６が再生する音圧を音響中
心で、しかも開放空間で検出することができることによ
り従来例のような空気歪を含まずに音圧を検出できるた
め高音という周波数領域でリニアリティが帰還量に比例
して改善できる。Description of Embodiments One embodiment of the present invention is shown in FIGS. That is, FIG. 2 shows a speaker for high sound (hereinafter referred to as tweeter).
A hole 6a is provided in the central portion of the flat diaphragm 6, the microphone 5 is arranged in the hole 6a, and the output cable 5a of the microphone 5 is taken out through the pipe 12. 7 is an edge, 8 is a frame, 9 is a top plate,
Reference numeral 10 is a magnet, 11 is a yoke, and 13 is a voice coil. With such a configuration, if the microphone 5 is an omnidirectional microphone, the sound pressure reproduced by the diaphragm 6 is detected substantially at the acoustic center thereof, and the position of the detection signal of the microphone 5 and the sound source by the diaphragm 6 is increased. The phase difference can be minimized, and the sound emitted from the diaphragm 6 can be accurately detected. Furthermore, since the sound pressure reproduced by the diaphragm 6 can be detected at the acoustic center and in the open space, the sound pressure can be detected without including air strain as in the conventional example, so that linearity is achieved in the high frequency range. It can be improved in proportion to the amount of feedback.
第３図はこのツィータ２′を使用したMFBのブロック図
で、マイクロホン５の出力信号が帰還回路４を介して電
力増幅器１の反転入力に帰還されると、いわゆる加速度
帰還がかかり帰還後はMFB効果によりツィータ２′の最
低共振周波数（f0）が低下し、従来例のようにノイズを
大幅に増加させることなく、帰還量だけツィータ２′の
歪を軽減することができる。FIG. 3 is a block diagram of an MFB using this tweeter 2 '. When the output signal of the microphone 5 is fed back to the inverting input of the power amplifier 1 via the feedback circuit 4, so-called acceleration feedback is applied and the MFB is fed back. Due to the effect, the lowest resonance frequency (f 0 ) of the tweeter 2'is lowered, and the distortion of the tweeter 2'can be reduced by the amount of feedback without significantly increasing noise as in the conventional example.
第４図はこの様子を示す音圧周波数特性で、帰還前の特
性は実線a,帰還後の特性は破線ｂになる。この図は、2.
8cm口径の平面振動板６をもつツィータ２′にMFBをかけ
てツィータ軸上の近傍の音圧を測った実測データであ
り、5.5KHz以下は負帰還となり、最低共振周波数は2KHz
から1.6KHzに低下している。また5KHz以上で正帰還にな
っているのはツィータ２′の再生音の位相が、スピーカ
の入力信号より180度以上回転しているためである。し
たがって、ツィータ２′の高域再生限界周波数が高くな
れば、さらに負帰還をかけられる高域限界が高くなるの
は当然である。また振動板の中央に孔を設けると振動板
の剛性が上がり、しかも軽量になるため能率を低下する
ことなく高域再生限界周波数を高めることができること
は有限要素法で確かめられている。FIG. 4 is a sound pressure frequency characteristic showing this state. The characteristic before feedback is a solid line a, and the characteristic after feedback is a broken line b. This figure is 2.
This is the measured data obtained by measuring the sound pressure near the tweeter axis by applying MFB to the tweeter 2'having a flat diaphragm 6 with an 8 cm diameter. 5.5 KHz or less is negative feedback, and the minimum resonance frequency is 2 KHz.
To 1.6 KHz. Further, the reason for positive feedback at 5 KHz or higher is that the phase of the reproduced sound of tweeter 2'is rotated by 180 degrees or more from the input signal of the speaker. Therefore, it goes without saying that the higher the high-frequency reproduction limit frequency of the tweeter 2 ', the higher the high-frequency limit to which negative feedback can be applied. Further, it has been confirmed by the finite element method that if a hole is provided in the center of the diaphragm, the rigidity of the diaphragm is increased and the diaphragm is lightweight, so that the high-range reproduction limit frequency can be increased without lowering the efficiency.
発明の効果 この発明のスピーカ装置は、振動板の中央部の孔に帰還
用のマイクロホンを配置したため、スピーカの能率を低
下させることなく、また周波数特性上も影響を与えるこ
となくMFBがかけられ、従来不可能であった高音用スピ
ーカに制御をかけることができ、しかも振動板が再生す
る音圧をほぼその音響中心で帰還用のマイクロホンによ
り検出するので、マイクロホンの検出信号と振動板によ
る音源との位相差を最小にでき、振動板から放射された
音を忠実にマイクロホンで検出できるとともに、歪を低
減し、周波数特性も制御できるものであり、その利用価
値は極めて大であるという効果がある。EFFECTS OF THE INVENTION Since the speaker device of the present invention has the microphone for feedback arranged in the hole at the center of the diaphragm, the MFB can be applied without reducing the efficiency of the speaker and affecting the frequency characteristics. It is possible to control a high-pitched speaker, which was not possible in the past, and the sound pressure reproduced by the diaphragm is detected by the return microphone at almost the acoustic center. The phase difference of can be minimized, the sound radiated from the diaphragm can be faithfully detected by the microphone, the distortion can be reduced, and the frequency characteristics can be controlled, and its utility value is extremely large. .
第１図は従来のMFBのシステムブロック図、第２図はこ
の発明の一実施例のスピーカの断面図、第３図はそのMF
Bのシステムブロック図、第４図はMFB前後の音圧周波数
特性図である。 １……電力増幅器、２′……高音用スピーカ、４……帰
還回路、５……マイクロホン、６……振動板、6a……孔FIG. 1 is a system block diagram of a conventional MFB, FIG. 2 is a sectional view of a speaker of an embodiment of the present invention, and FIG.
FIG. 4 is a system block diagram of B, and FIG. 4 is a sound pressure frequency characteristic diagram before and after the MFB. 1 ... Power amplifier, 2 '... High frequency speaker, 4 ... Feedback circuit, 5 ... Microphone, 6 ... Diaphragm, 6a ... Hole
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭55−153495（ＪＰ，Ａ) 特開 昭48−75218（ＪＰ，Ａ) 特開 昭55−112097（ＪＰ，Ａ) 特開 昭56−69996（ＪＰ，Ａ) 実開 昭55−152786（ＪＰ，Ｕ) 実開 昭55−115193（ＪＰ，Ｕ) 実開 昭55−18826（ＪＰ，Ｕ) 特公 昭53−17052（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-153495 (JP, A) JP-A-48-75218 (JP, A) JP-A-55-112097 (JP, A) JP-A-56- 69996 (JP, A) Actual opening Sho 55-152786 (JP, U) Actual opening Sho 55-115193 (JP, U) Actual opening Sho 55-18826 (JP, U) Japanese Patent Sho 53-17052 (JP, B2)
Claims (1)
音用スピーカと、前記平面振動板と略同一平面となるよ
う前記孔に配置され、前記高音用スピーカの再生音を検
出して当該高音用スピーカを制御する帰還用のマイクロ
ホンとを備えたスピーカ装置。1. A treble speaker having a flat diaphragm having a hole in the center thereof and a treble speaker arranged in the hole so as to be substantially on the same plane as the flat diaphragm and detecting a reproduced sound of the treble speaker. A speaker device comprising a feedback microphone for controlling the treble speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20135282A JPH0732508B2 (en) | 1982-11-15 | 1982-11-15 | Speaker device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20135282A JPH0732508B2 (en) | 1982-11-15 | 1982-11-15 | Speaker device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5990495A JPS5990495A (en) | 1984-05-24 |
| JPH0732508B2 true JPH0732508B2 (en) | 1995-04-10 |
Family
ID=16439606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20135282A Expired - Lifetime JPH0732508B2 (en) | 1982-11-15 | 1982-11-15 | Speaker device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732508B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007020152A (en) * | 2005-06-07 | 2007-01-25 | Nidec Pigeon Corp | Speaker |
| WO2008018099A1 (en) * | 2006-08-10 | 2008-02-14 | Claudio Lastrucci | Improvements to systems for acoustic diffusion |
-
1982
- 1982-11-15 JP JP20135282A patent/JPH0732508B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5990495A (en) | 1984-05-24 |
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