JPS59196693A - Speaker device - Google Patents
Speaker deviceInfo
- Publication number
- JPS59196693A JPS59196693A JP7094583A JP7094583A JPS59196693A JP S59196693 A JPS59196693 A JP S59196693A JP 7094583 A JP7094583 A JP 7094583A JP 7094583 A JP7094583 A JP 7094583A JP S59196693 A JPS59196693 A JP S59196693A
- Authority
- JP
- Japan
- Prior art keywords
- enclosure
- sound pressure
- center
- speaker
- buffle
- 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.)
- Granted
Links
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
- H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
Abstract
Description
【発明の詳細な説明】
本発明は低音用スピーカをエンクロージャのノくツフル
面に取付けて成るスピーカ装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a speaker device in which a bass speaker is attached to a nozzle surface of an enclosure.
第１図は従来のこの棟の２ウエイスピーカ装置を示し、
ｆＩｌ＆！直方体のエンクロージャ、 ＋２１＆Ｘエ
ンクロージヤ（１）のバッフル面、 ［３１，＋４１は
バッフル面（２）に取付けられた。それぞれ、低音用ス
ピーカ。Figure 1 shows the conventional two-way speaker system for this building.
fl&! Rectangular parallelepiped enclosure, +21&X baffle surface of enclosure (1), [31, +41 were attached to baffle surface (2). Each has a bass speaker.
高音用スピーカである。This is a high-pitched speaker.
第２図は上記装置によって放射される音波の。Figure 2 shows the sound waves emitted by the device.
バッフル面（２）の正面遠方での、音圧周波数特性を示
し、実線ａは総合特性であ９２点線す、 ｃはそれぞ
れ低音用スピーカ（３）、高音用スピーカ（４）だけを
駆動した時の特性である。The sound pressure frequency characteristics are shown in the far front direction of the baffle surface (2), where the solid line a is the overall characteristic (92 dots), and c is when only the bass speaker (3) and treble speaker (4) are driven, respectively. It is a characteristic of
ところで、上記装置では、低音用スピーカ（３）を駆動
すると、エンクロージャ（１）内に固有の共振。By the way, in the above device, when the bass speaker (3) is driven, a unique resonance occurs within the enclosure (1).
すなわち、定在波が起こることが知られている。In other words, it is known that standing waves occur.
この定在波は、低音用スピーカ（３）から放射される音
波の音圧特性に影響を与えてピークやディップを生じさ
せ、音質を劣化させる要因となる。この定在波対策とし
て、エンクロージャ（１）の内壁に吸音材を貼っている
が、それでも、第２図に示した特性すのように、低音用
スピーカ（３）の再生帯域に乱れが生じている。This standing wave affects the sound pressure characteristics of the sound waves emitted from the bass speaker (3), causing peaks and dips, and becomes a factor in deteriorating sound quality. As a countermeasure against this standing wave, sound absorbing material is pasted on the inner wall of the enclosure (1), but even so, as shown in the characteristics shown in Figure 2, disturbances occur in the reproduction band of the bass speaker (3). There is.
ソシテ、エンクロージャ（１）のような直方体の閉じた
音場で起こる固有の共振周波数ｆｒ ｋ１次式のとおシ
であることも知られている。It is also known that the natural resonant frequency that occurs in a rectangular closed sound field such as an enclosure (1) is a linear formula.
ここで、Ｃは音速、 Ｈ，Ｗ、 Ｄ は直方体音場
の上下、左右１前後各方向の寸法ｒ ｎＨ＃ ”Ｗｌ
”Ｄ＋’ Ｈ＊Ｗ、Ｄに対応した定在波のモードを表わ
す整数（０，１，２，・・・）である。Here, C is the speed of sound, H, W, D are the dimensions of the rectangular parallelepiped sound field in the vertical, horizontal, forward and backward directions r nH# ”Wl
"D+" is an integer (0, 1, 2, . . . ) representing the standing wave mode corresponding to H*W, D.
上記（１）式で計算できるようＩＣ，エンクロージャ内
の一辺が音波の波長の半分、その整数倍になる一方向の
みのモード（ｎＨ＋ ｎＷ＋ ｎＤのうちの二つが０−
このモードは軸モードと呼ばれる）、すらに、二方向以
上のモードが重なシ合うモード（”Ｈ＋ｎｙ、 ｎＤの
うちの二つ以上が０でない）が形成される周波数で定在
波が多数生ずる。それらは最大辺長が半波長になる周波
数を最低として順次生ずることになへたとえば、第１図
に示したように。As can be calculated using equation (1) above, the mode in only one direction (nH + nW + nD is 0-
This mode is called an axial mode), and many standing waves are generated at frequencies where modes in two or more directions overlap (two or more of H+ny and nD are not 0). For example, as shown in FIG. 1, these occur sequentially, with the lowest frequency being the one where the maximum side length is half a wavelength.
上下方向の寸法が一番大きいエンクロージャでは。In the enclosure with the largest vertical dimension.
最低の固有共振周波数ｆｒはＣ／２Ｈとなる。すなわち
＋ ｎ）ｌ−１、ｎｗ” ｎＤ＝Ｑである。The lowest natural resonance frequency fr is C/2H. That is, +n)l-1, nw''nD=Q.
また、（Ｉ）式で表わされる 周波数で定在波が生ずる
場合には、エンクロージャ内の音圧または粒子速度分布
が固有な分布となることも知られており。It is also known that when a standing wave is generated at the frequency expressed by equation (I), the sound pressure or particle velocity distribution within the enclosure becomes a unique distribution.
第３図に一方向のみのモード（軸モード）Ｋ関する１〜
３次の分布例を示す。同図の横軸は距離で両端がエンク
ロージャの端面に相当し、縦軸は音圧または粒子速度の
最大値で規準化した値であシ。Figure 3 shows 1 to 1 for K in one direction only mode (axial mode).
An example of a cubic distribution is shown. The horizontal axis of the figure is distance, with both ends corresponding to the end faces of the enclosure, and the vertical axis is the value normalized by the maximum value of sound pressure or particle velocity.
実線２点線はそれぞれ音圧２粒子速度を表わし。The solid two-dot lines each represent the sound pressure and particle velocity.
特性（ａｔ、 （ｂｌ＋ （ｃｌの順に軸モードの１次
、２次、３次の分布である。これらは閉止音響管と同等
の分布を示して・おシ、音圧分布をみると、１次では一
辺の中心に、２次では両端から一辺の１／４の位置に、
３次では中心と両端から一辺の１／６の位置に節（音圧
Ｃ）が存在する。Characteristics (at, (bl+ (cl) are the 1st, 2nd, and 3rd order distributions of the axial modes.These show distributions equivalent to those of a closed acoustic tube.If you look at the sound pressure distribution, 1 In the next case, at the center of one side, and in the second case, from both ends to 1/4 of the side,
In the third order, nodes (sound pressure C) exist at positions 1/6 of one side from the center and both ends.
定在波対策として、第３図の定在波モードを考慮した方
法もとられる。すなわち、定在波音圧モードの節の位置
に低音用スピーカを取付ける方法で、低音用スピーカの
中心を音圧モードの節にほぼ一致させれば、そのモード
を発生させる定在波は励起されない。これを第１図につ
いていえば。As a countermeasure against standing waves, a method that takes into consideration the standing wave mode shown in FIG. 3 is also taken. That is, by attaching a bass speaker at the node of the standing wave sound pressure mode, if the center of the bass speaker is made to approximately coincide with the node of the sound pressure mode, the standing wave that generates that mode will not be excited. Let's talk about this in Figure 1.
低音用スピーカ（３）をバッフル面（２）の中央に取付
ければ、エンクロージャ（１）の上下、左右各方向の中
心に低音用スピーカ（３）があるので、第３図（ａｌの
１次モード（ｎＨ＝１ 、 ｎｗ＝ １ ）を発生させ
るそれぞれの周波数で定在波は励起されないことになる
。If the bass speaker (3) is installed in the center of the baffle surface (2), the bass speaker (3) will be located at the center of the enclosure (1) in the vertical, horizontal, and horizontal directions. No standing waves will be excited at the respective frequencies that generate the modes (nH=1, nw=1).
また、第３図（ｃｌのように、３次モード、さらには。Also, as in Fig. 3 (cl), the tertiary mode, and even.
それ以上の奇数次のモードでも中央に音圧の節があるの
で、それらの定在波も励起されないことになる。第３図
（ｔ）ｌの２次モード、それ以上の偶数次のモードにつ
いても、上記と同様なことがいえる。Since there is a sound pressure node in the center even in odd-numbered modes, those standing waves are not excited either. The same thing can be said about the second-order mode of FIG. 3(t)l and the even-numbered modes beyond that.
しかし、第１図の低音用スピーカ（３）は、第３図のモ
ード図でいえばその左、右どちらか一端にあシアエンク
ロージャ（１１内に前後（奥行）方向に起こる定在波に
対してげその音圧モードの腹の位置を駆動するものであ
る。However, in the mode diagram of Fig. 3, the bass speaker (3) in Fig. 1 is located at either the left or right end of the bass enclosure (11) to prevent standing waves occurring in the front-rear (depth) direction. This is to drive the position of the antinode of the sound pressure mode.
従来装置には、上記のように、エンクロージャの前後方
向の定在波が必らず励起されてしまい。As mentioned above, in the conventional device, standing waves in the front and rear directions of the enclosure are always excited.
それによシ音圧特性に乱れが生ずるという欠点がある。This has the disadvantage of causing disturbances in the sound pressure characteristics.
本発明な工、従来装置の上記のような欠点を除去するこ
とを目的とし、このため、エンクロージャを、バッフル
面、左、右側板、天板、底板、裏板から成り、左、右両
側板がバッフル面に対し内側に傾斜し、これによシ、そ
の水平横断面が台形をなし、その内寸の上辺（裏板）Ｗ
ｓ、 下辺（バッフル面） ＷＬ ＊高き（奥行）Ｄ
がＷｓ＜ＷＬ、Ｄ≧（Ｗ８＋ＷＬ）／４ であるもの
とし、かつ、そのバックル面の左右方向の中央Ｋｉｖｃ
低音用スピーカを取付けるものである。The present invention aims to eliminate the above-mentioned drawbacks of the conventional device, and for this purpose, an enclosure is made up of a baffle surface, left and right side plates, a top plate, a bottom plate, a back plate, and left and right side plates. is inclined inward with respect to the baffle surface, so that its horizontal cross section forms a trapezoid, and its inner dimension is the upper side (back plate) W
s, Lower side (baffle surface) WL *Tall (depth) D
Ws<WL, D≧(W8+WL)/4, and the center Kivc of the buckle surface in the left-right direction
This is for attaching a bass speaker.
第４図は本発明の一実施例を示し、（ａ）は正面図。FIG. 4 shows an embodiment of the present invention, and (a) is a front view.
（ｔｌｌ＋’：Ｃ（ａｌのＩ−１に沿った水平横断面図
、 ＋１１〜（３］は。(tll+':C(horizontal cross-sectional view along I-1 of al, +11~(3).
第１図におけると同じく、それぞれ、エンクロージャ、
バッフル面、低音用スピーカ、 （ｓａ’）は左側板
、 （ｓｂ）は右側板、 （ｓｃ）は天板、（阻）
は底板、（６）は裏板であるが、左側板（ｓｔＱ 、右
側板（ｓｂ） 、はバッフル面（２）の左、右各端に内
側に＃Ｉ斜して接合され、これによｐ２２、エンクロー
ジャ（１）＆丁、第４図Ｆ１）１に明らかなように。As in FIG. 1, respectively, the enclosure,
Baffle surface, bass speaker, (sa') is left side board, (sb) is right side board, (sc) is top board, (block)
is the bottom plate, (6) is the back plate, and the left side plate (stQ) and right side plate (sb) are joined to the left and right ends of the baffle surface (2) with #I diagonal inward. p22, Enclosure (1) & Ding, as evident in Figure 4 F1) 1.
（イ）その水平横断面が台形をなし。(b) Its horizontal cross section is trapezoidal.
（ロ）その台形の内寸の上辺（裏板（６）での長さ）
Ｗｓ。(b) The upper side of the inner dimension of the trapezoid (length at the back plate (6))
Ws.
下辺（バックル面（２）での長さ）ＷＬ、 高さく奥
行）ＤがＷｓ（ＷＬ、 Ｄ≧（Ｗｓ ＋ＷＬ ） ／
４であシ。Lower side (length at buckle surface (2)) WL, height and depth) D is Ws (WL, D≧(Ws +WL) /
It's 4.
ヒｊその台形の下辺、すなわち、バッフル面（２）の中
央部に低音用スピーカ（３）を取付けている。A bass speaker (3) is attached to the lower side of the trapezoid, that is, the center of the baffle surface (2).
ものである。従来、上記（イ）のように、ニックロージ
ャの壁面を傾斜させたものは存在するが２本発明は、上
記目的のため、さらに上記（口１． （／ｊのとおし、
エンクロージャの寸法、低音用スピーカの取付位置全限
定するものである。It is something. Conventionally, there have been devices in which the wall surface of the nick closure is inclined as shown in (a) above.
The dimensions of the enclosure and the mounting position of the bass speaker are completely limited.
一般に、スピーカをある定在波の音圧モードの腹が形成
される付近ｆｃ［１２付けると、その定在波周波数前後
で音場はスピーカの振動板に大きな力（音圧）を加える
ことになシ、前記のとおシ、スピーカの音圧特性は大き
く乱される。これに対し。Generally, if a speaker is attached near fc [12] where the antinode of the sound pressure mode of a certain standing wave is formed, the sound field will apply a large force (sound pressure) to the diaphragm of the speaker around the frequency of the standing wave. However, as described above, the sound pressure characteristics of the speaker are greatly disturbed. Against this.
上ｎｉ″実施例では、エンクロージャ（１）内の音場に
生ずる。第１図の従来装置の直方体状エンクロージャの
前後方向の１次に相当する定在波は、第４図（ｂｌに示
した点線（７）を音圧の節とするようなモードを形成す
る。これは左、右側板（５ａ）、 （５ｂ） カバッフ
ル面に対し内側に傾斜し、上記（イ）、（ロ）のとおり
となっているために形成されるものであり、そのモード
の腹、すなわち、音圧の商いところに裏板（６）の中央
部付近とバッフル面（２）の左、右両端付近となる。し
たがって、上記ビ埼のとおυ、バッノル面（２）の中央
部に取付けられている低音用スピーカ（３）の振動板に
加えらる音圧は比戟的低く、それによる低音用スピーカ
（３）の音圧特性の乱れは少ない。In the upper ni'' embodiment, a standing wave is generated in the sound field inside the enclosure (1). A mode is formed in which the dotted line (7) is the node of sound pressure.This mode is inclined inward with respect to the cover full surface of the left and right panels (5a) and (5b), as shown in (a) and (b) above. The antinode of the mode, that is, the point where the sound pressure trades, is near the center of the back plate (6) and near both the left and right ends of the baffle surface (2). Therefore, the sound pressure applied to the diaphragm of the bass speaker (3) installed at the center of the bass panel surface (2) is relatively low, and the bass speaker (3) is therefore ) there is little disturbance in the sound pressure characteristics.
なお、上記実施例でｔ工、エンクロージャ（３）の上。In addition, in the above example, the top of the enclosure (3).
下の天板、底板が平行であるので、上下方向の定在波が
従来装置の直方体状エンクロージャと同様に起こるが、
第１図の従来装置について６ｉＪ記したように、低音用
スピーカ（３）の取付位置を上下方向の定在波の音圧モ
ードの節の位置□ともすることによって、その対策とす
ることができる。Since the lower top and bottom plates are parallel, standing waves in the vertical direction occur in the same way as in the rectangular parallelepiped enclosure of conventional equipment.
As noted in 6iJ for the conventional device in Fig. 1, this can be countered by setting the mounting position of the bass speaker (3) to the node position of the sound pressure mode of the vertical standing wave. .
以上のように２本発明によれば、低音用スピーカをエン
クロージャのバッフル面に取付けて成るスピーカ装置を
、エンクロージャの前彼方向に生ずる定在波の影響が小
さく、シたがって、低音用スピーカの背圧特性の乱れが
少なく、ひいて、それによる音質の劣化も少ないものと
することができる。As described above, according to the two aspects of the present invention, a speaker device comprising a bass speaker mounted on the baffle surface of an enclosure is less affected by standing waves generated in the front direction of the enclosure. There is less disturbance in the back pressure characteristics, and as a result, there is less deterioration in sound quality.
第１図は従来のスピーカ装置を示す斜視図、第２図は第
１図示のものの音圧周波数特性を示す図。
第３図１ａｊ〜（ｃ）は定在波周波数時の音圧と粒子速
度の、それぞれ、１次〜３次のモードを示す図、第４図
（・ま本発明の一実施例を示し、（ａ）は正面図、（ｂ
）ｔＸ（ａｔ＜７） ｉ −Ｔに沿った水平横断面図で
ある。
＋１．ｌ・・・エンクロージャ、（２）・・−バッフル
面、 ＋３１・・・低音用スピーカ、 （Ｓａ）・・
・左側板、 （ｓｂ）・・・右側板代理人大岩増雄
第１図
′）
第２図
第３図
（ｃＬ）
第
ｄ
（α）
＜ｂ）FIG. 1 is a perspective view showing a conventional speaker device, and FIG. 2 is a diagram showing sound pressure frequency characteristics of the speaker device shown in FIG. Fig. 3 1aj to (c) are diagrams showing the first to third order modes of sound pressure and particle velocity, respectively, at a standing wave frequency, and Fig. 4 shows an embodiment of the present invention. (a) is a front view, (b)
)tX(at<7) i -T. +1. l...Enclosure, (2)...-baffle surface, +31...Bass speaker, (Sa)...
・Left side plate, (sb)...Right side plate agent Masuo Oiwa Figure 1') Figure 2 Figure 3 (cL) d (α) <b)
Claims (2)
に取付けて成るスピーカ装置において、エンクロージャ
を、バラノル面、左、右側板、天板。 底板、裏板から成り、左、右両側板が）くツフル面に対
して内側に傾斜し、これによυ、水平横断面が台形をな
し、その内寸の上辺（裏板）ＷＳ、 下辺（バックル
面）ＷＬｌ 高さく奥行）ＤがＷＳ＜ＷＬＩ Ｄ≧（
ＷＳ＋ＷＬ）／４であるものとし。 かつ、低音用スピーカヲノクツフル面の左右方向の中央
部に取付けたことを特徴とするスピーカ装置。(1) Place the bass speaker in the enclosure (in a speaker device that is mounted on the double side, the enclosure consists of the balanor side, left and right side plates, and top plate; bottom plate, back plate, and left and right side plates). It is inclined inward with respect to the full surface, so that υ, the horizontal cross section forms a trapezoid, and the inner dimensions of the upper side (back plate) WS, lower side (buckle side) WLl (height and depth) D are WS<WLI D ≧(
WS+WL)/4. The speaker device is further characterized in that the bass speaker is attached to the center in the left-right direction of the full surface.
内に上下方向に生ずる定在波の音圧モードの節の位置で
もあることを特徴とする特許請求の範囲第１項記載のス
ピーカ装置。(2) The speaker device according to claim 1, wherein the mounting position of the bass speaker is also a node position of a sound pressure mode of a standing wave generated vertically within the enclosure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7094583A JPS59196693A (en) | 1983-04-22 | 1983-04-22 | Speaker device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7094583A JPS59196693A (en) | 1983-04-22 | 1983-04-22 | Speaker device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59196693A true JPS59196693A (en) | 1984-11-08 |
| JPS6351637B2 JPS6351637B2 (en) | 1988-10-14 |
Family
ID=13446144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7094583A Granted JPS59196693A (en) | 1983-04-22 | 1983-04-22 | Speaker device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59196693A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7280667B2 (en) | 2004-04-26 | 2007-10-09 | Onkyo Corporation | Speaker system |
| JP2008131199A (en) * | 2006-11-17 | 2008-06-05 | Pioneer Electronic Corp | Speaker system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7420756B2 (en) | 2003-05-20 | 2008-09-02 | Donnelly Corporation | Mirror reflective element |
-
1983
- 1983-04-22 JP JP7094583A patent/JPS59196693A/en active Granted
Non-Patent Citations (1)
| Title |
|---|
| JOURNAL OF THE AUDIO ENGINEERING SOCIETY=1981 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7280667B2 (en) | 2004-04-26 | 2007-10-09 | Onkyo Corporation | Speaker system |
| JP2008131199A (en) * | 2006-11-17 | 2008-06-05 | Pioneer Electronic Corp | Speaker system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6351637B2 (en) | 1988-10-14 |
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