JPS6351635B2 - - Google Patents

Info

Publication number
JPS6351635B2
JPS6351635B2 JP20501482A JP20501482A JPS6351635B2 JP S6351635 B2 JPS6351635 B2 JP S6351635B2 JP 20501482 A JP20501482 A JP 20501482A JP 20501482 A JP20501482 A JP 20501482A JP S6351635 B2 JPS6351635 B2 JP S6351635B2
Authority
JP
Japan
Prior art keywords
speaker
speaker device
enclosure
bass
sound pressure
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
Application number
JP20501482A
Other languages
Japanese (ja)
Other versions
JPS5994992A (en
Inventor
Shinichi Sakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP20501482A priority Critical patent/JPS5994992A/en
Publication of JPS5994992A publication Critical patent/JPS5994992A/en
Publication of JPS6351635B2 publication Critical patent/JPS6351635B2/ja
Granted legal-status Critical Current

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
    • 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
    • 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 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Description

【発明の詳細な説明】 この発明は、低音用スピーカの再生帯域内では
定在波がエンクロージヤー内音場でなるべく発生
しないようにし、平坦な音圧特性、良好な音質を
得るスピーカ装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker device that prevents the generation of standing waves in the sound field within an enclosure as much as possible within the reproduction band of a bass speaker, thereby obtaining flat sound pressure characteristics and good sound quality. .

一般に、ほとんどのスピーカ装置は直方体状の
エンクロージヤーとそのバツフル面にユニツトが
取り付けられている構成となつている。すなわ
ち、従来のスピーカ装置として第１図に示すもの
があつた。同図は２ウエイのスピーカ装置を示
し、１は直方体のエンクロージヤー、２はエンク
ロージヤー１のバツフル面、３および４はそれぞ
れバツフル面２に取り付けられた低音用スピーカ
および高音用スピーカである。 Generally, most speaker devices have a configuration in which a unit is attached to a rectangular parallelepiped enclosure and a baffle surface of the enclosure. That is, there is a conventional speaker device shown in FIG. The figure shows a two-way speaker device, where 1 is a rectangular parallelepiped enclosure, 2 is a butt-full surface of the enclosure 1, and 3 and 4 are a bass speaker and a treble speaker respectively attached to the butt-full surface 2. .

このスピーカ装置のクロスオーバ周波数をfc
（Hz）とし、さらにこのクロスオーバ周波数fcを
低音用スピーカ４の高域カツトオフ周波数とも呼
ぶことにする。また、エンクロージヤー１内の音
場はおおよそ直方体であるものとし、その上下、
左右、前後方向の寸法をそれぞれＨ、Ｗ、Ｄとす
る。 The crossover frequency of this speaker device is f c
(Hz), and this crossover frequency f c will also be referred to as the high frequency cutoff frequency of the bass speaker 4. In addition, the sound field inside enclosure 1 is assumed to be approximately a rectangular parallelepiped, and the upper and lower sides,
Let the dimensions in the left-right and front-back directions be H, W, and D, respectively.

このスピーカ装置によつて放射される音波のバ
ツフル面２の正面遠方での音圧周波数特性を第２
図に示す。同図で特性ａ（実線）はこのシステム
の総合特性を、特性ｂ，ｃはそれぞれ低音用スピ
ーカ３高音用スピーカ４だけを駆動したときの特
性を表わす。 The sound pressure frequency characteristics of the sound waves emitted by this speaker device at a distance from the front of the buff-full surface 2 are
As shown in the figure. In the figure, characteristic a (solid line) represents the overall characteristic of this system, and characteristics b and c represent the characteristics when only the bass speaker 3 and the treble speaker 4 are driven, respectively.

このようなスピーカ装置では、低音用スピーカ
３を駆動すると、エンクロージヤー１内の音場に
おいて固有の共振、すなわち定在波が起ることが
知られている。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ピークやデ
イツプを生じさせる。定在波の実際的な対策方法
として、吸音材をエンクロージヤー内壁に貼る方
法がとられるが、それでも第２図の特性に示した
ように、低音用スピーカ３の再生帯域に乱れを生
じさせることがある。これは音質を劣化させる要
因にもなる。 In such a speaker device, it is known that when the bass speaker 3 is driven, a unique resonance, that is, a standing wave occurs in the sound field within the enclosure 1. The standing waves affect the sound pressure characteristics of the sound waves emitted from the bass speaker 3, causing peaks and dips. As a practical countermeasure against standing waves, a method of pasting sound-absorbing material on the inner wall of the enclosure is taken, but this still causes disturbances in the reproduction band of the bass speaker 3, as shown in the characteristics in Figure 2. Sometimes. This also causes deterioration of sound quality.

一方、以上に述べたエンクロージヤー１のよう
に直方体状の閉じた音場では次の(1)式の固有周波
数frで共振が起ることが知られている。すなわ
ち、 であり、この(1)式でＣは音速、Ｈ、Ｗ、Ｄは上述
した音場の寸法、nH、nW、nDはそれぞれＨ、Ｗ、
Ｄの寸法に対応した定在波のモードを表わす整数
（０、１、２……）である。 On the other hand, it is known that in a rectangular closed sound field such as the enclosure 1 described above, resonance occurs at the natural frequency fr expressed by the following equation (1). That is, In this equation (1), C is the speed of sound, H, W, and D are the dimensions of the sound field mentioned above, and n H , n W , and n D are H, W, and D, respectively.
It is an integer (0, 1, 2...) representing the mode of the standing wave corresponding to the dimension of D.

この(1)式で計算できるように、エンクロージヤ
ー１の一辺が音波の波長の半分およびその整数倍
になる一方向のみモード（nH、nW、nDのうち二つ
が０−このモードは軸モードと呼ばれる）さら
に、二方向以上のモードが重なり合つたときのモ
ード（nH、nW、nDのうち二つ以上が０でない）が
形成される周波数で定在波が多数生ずる。 As can be calculated using equation (1), one side of the enclosure 1 is a unidirectional mode where one side of the wave length is half the wavelength of the sound wave and an integer multiple thereof (two of n H , n W , and n D are 0 - this mode Furthermore, many standing waves are generated at the frequency where a mode (two or more of n H , n W , and n D is not 0) is formed when modes in two or more directions overlap. .

こ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る。例えば、第１図に
示したように上下方向の寸法が一番大きいエンク
ロージヤーでは、最低の固有周波数frはＣ／2H
となる。すなわち、nH＝１、nW＝nD＝０で、この
ときの定在波は一般にモード（nH、nW、nD）＝
（１、０、０）と表わされる。 These occur sequentially with the lowest frequency having a maximum side length of half a wavelength. For example, in the enclosure with the largest vertical dimension as shown in Figure 1, the lowest natural frequency f r is C/2H
becomes. That is, n H = 1, n W = n D = 0, and the standing wave at this time is generally the mode (n H , n W , n D ) =
It is expressed as (1, 0, 0).

一方、(1)式で表わされる周波数で定在波が生ず
る場合には、エンクロージヤー１内音場の音圧ま
たは粒子速度分布は固有な分布となることが知ら
れており、一方向のみのモード（軸モード）に関
する１〜３次の分布例を第３図に示す。同図にお
いて、横軸は距離で両端がエンクロージヤー１の
壁面に相当し、縦軸は音圧または粒子速度の最大
値で規格化した値を示す。実線および破線はそれ
ぞれ音圧および粒子速度を表わし、第３図ａ、第
３図ｂ、第３図ｃの順に軸モードの１次、２次、
３次の分布となる。 On the other hand, when a standing wave is generated at the frequency expressed by equation (1), it is known that the sound pressure or particle velocity distribution of the sound field inside enclosure 1 becomes a unique distribution, and only in one direction. FIG. 3 shows an example of the 1st to 3rd order distribution regarding the mode (axial mode). In the figure, the horizontal axis represents distance, both ends of which correspond to the wall surface of the enclosure 1, and the vertical axis represents a value normalized by the maximum value of sound pressure or particle velocity. The solid line and the broken line represent the sound pressure and particle velocity, respectively, and the axial mode's primary, secondary, and
This results in a cubic distribution.

これらは閉止音響管と同等の分布を示してお
り、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四分の一の位置に、３次
では中心と両端から六分の一の位置に節（音圧
０）が存在する。 These have a distribution equivalent to that of a closed acoustic tube, and looking at the sound pressure distribution, in the first order, there is
In the second order, nodes (sound pressure 0) exist at positions one-quarter of a side from both ends, and in the third order, nodes (sound pressure 0) exist at positions one-sixth from the center and both ends.

吸音材を用いて定在波を対策する方法の他に、
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ス
ピーカを配置する方法で、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とになる。その例
を第１図と第３図を用いて説明する。 In addition to countermeasures against standing waves using sound absorbing materials,
A method that takes into account the standing wave mode shown in FIG. 3 is also used. In other words, by arranging the speaker at the node of the standing wave sound pressure mode, and by aligning the center of the speaker approximately with the node of the sound pressure mode, the standing wave that generates that mode will not be excited. An example of this will be explained using FIGS. 1 and 3.

第１図において、低音用スピーカ３をバツフル
面２の中央に配置すれば、エンクロージヤー１の
上下と、左右方向の中心に低音用スピーカ３があ
るので、第３図ａの１次モード（nH＝１および
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。 In FIG. 1, if the bass speaker 3 is placed in the center of the flat surface 2, the bass speaker 3 will be located at the center of the vertical and horizontal directions of the enclosure 1, so the primary mode (a) in FIG. n H =1 and
No standing waves will be excited at each frequency that generates n W =1).

また、第３図ｃのように３次モード、さらには
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。 Furthermore, as shown in FIG. 3c, since there is a sound pressure node in the center of the third-order mode and even odd-numbered modes, these standing waves are not excited either.

第３図ｂの２次および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言える。 The same thing can be said about the second-order and higher even-order modes shown in FIG. 3b.

しかし、第１図に示した従来のスピーカ装置の
ように、１個の低音用スピーカ３で駆動し、上下
方向に長い（Ｈ＞Ｗ）ものでは、１次（奇数次）
と２次（偶数次）の節を同時に駆動することは不
可能である。すなわち、スピーカの中心は少なく
ともどちらかの節の位置からはずれており、いく
つかの低次モードの定在波が励起されてしまう。 However, like the conventional speaker device shown in Fig. 1, which is driven by one bass speaker 3 and is long in the vertical direction (H>W), the primary (odd order)
It is impossible to drive the and the second-order (even-numbered) nodes at the same time. That is, the center of the speaker is deviated from the position of at least one of the nodes, and some low-order mode standing waves are excited.

また、前後方向の定在波に関しては定在波が生
ずる周波数において、低音用スピーカ３は、音圧
モードの腹の位置、第３図のモード図で言えばど
ちらか一端で駆動することになる。したがつて、
前後方向の定在波は必ず励起されてしまう。 Regarding the standing waves in the front-rear direction, at the frequency where the standing waves are generated, the bass speaker 3 is driven at the antinode position of the sound pressure mode, or at either end in the mode diagram of Fig. 3. . Therefore,
Standing waves in the front-back direction are always excited.

以上、従来のスピーカ装置では、周波数の低い
ところから定在波が励起され第２図に示したよう
に、それが音圧特性に影響を与え乱れを残す欠点
を有している。また、たとえ定在波による音圧特
性の乱れを吸音材などにより抑え、音圧特性を平
坦化できたとしても、定在波は根本的になくなつ
てはいないということができる。この事実は定在
波がスピーカ装置の音質に影響を与え、それを劣
化させる一因となつている欠点も有している。 As mentioned above, the conventional speaker device has the drawback that standing waves are excited from a low frequency region, and as shown in FIG. 2, this affects the sound pressure characteristics and leaves disturbances. Furthermore, even if it is possible to flatten the sound pressure characteristics by suppressing the disturbance in the sound pressure characteristics caused by the standing waves using a sound absorbing material, it can be said that the standing waves have not fundamentally disappeared. This fact also has the disadvantage that the standing waves affect the sound quality of the speaker device and are a contributing factor to its deterioration.

この発明は、上記従来の欠点を改善するために
なされたもので、低音用スピーカを２個またはそ
れ以上使用し、エンクロージヤーの形状を変え、
そこへのスピーカの配置を考慮することにより、
低音用スピーカの再生帯域内では定在波がなるべ
く生じないような高性能なスピーカ装置を提供す
ることを目的とする。 This invention was made to improve the above-mentioned conventional drawbacks, and it uses two or more bass speakers, changes the shape of the enclosure,
By considering the placement of the speakers there,
It is an object of the present invention to provide a high-performance speaker device in which standing waves are not generated as much as possible within the reproduction band of a bass speaker.

以下、この発明のスピーカ装置の実施例の詳細
を図により説明する。第４図ａはこの発明の一実
施例の正面図、第４図ｂは第４図ａの４ｂ−４ｂ
に沿つて切断した中央断面図を示す。この第４図
ａ、第４図ｂの両図において、第１図と同一部分
には同一符号をして述べることにする。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the speaker device of the present invention will be described below with reference to the drawings. FIG. 4a is a front view of one embodiment of the present invention, and FIG. 4b is 4b-4b of FIG. 4a.
A central cross-sectional view taken along is shown. In both FIGS. 4a and 4b, the same parts as in FIG. 1 are designated by the same reference numerals and described.

この両図において、１はエンクロージヤー、２
はバツフル面であり、これらは第１図と同様であ
る。また、３ａ，３ｂは低音用スピーカ、５はバ
ツフル面２に結合しエンクロージヤー１の内側に
傾斜させて固定された取り付け板である。 In both figures, 1 is the enclosure, 2
are buff-full surfaces, and these are the same as in FIG. Further, 3a and 3b are bass speakers, and 5 is a mounting plate connected to the buttful surface 2 and fixed to the inside of the enclosure 1 at an angle.

低音用スピーカ３ａおよび３ｂはそれぞれバツ
フル面２および取り付け板５に取り付けられてお
り、それらの高域カツトオフ周波数をfcとする。
エンクロージヤー１内音場の寸法は第４図に示す
ように上下、左右、前後をそれぞれH1、H2、
Ｗ、Ｄとする。 The bass speakers 3a and 3b are attached to the baffle surface 2 and the mounting plate 5, respectively, and their high frequency cutoff frequency is f c .
As shown in Figure 4, the dimensions of the sound field inside enclosure 1 are H 1 , H 2 for the top and bottom, left and right, and front and rear, respectively.
Let them be W and D.

この発明の主たる目的は、目的の欄の説明から
も明らかなように、第１図に示したような従来の
直方体状エンクロージヤーでは必ず励起される前
後方向の定在波を励起させないようにするもので
ある。前後方向の１次の定在波は(1)式よりＣ／
2Dの周波数で起り（モード（０、０、１））、そ
のときには第４図ｂの一点鎖線ｄのように前後方
向の中央に音圧モードの節が形成される。したが
つて、取り付け板５に取り付けられる低音用スピ
ーカ３ｂをその節の位置に配置すれば、１次（お
よび奇数次）の定在波は励起されないことにな
る。 As is clear from the explanation in the purpose column, the main purpose of this invention is to prevent the excitation of standing waves in the front and rear directions that are always excited in the conventional rectangular parallelepiped enclosure as shown in Fig. 1. It is something to do. From equation (1), the first-order standing wave in the front-back direction is C/
This occurs at a 2D frequency (mode (0, 0, 1)), and in that case, a sound pressure mode node is formed at the center in the front-rear direction, as shown by the dashed line d in Figure 4b. Therefore, if the bass speaker 3b attached to the mounting plate 5 is placed at the node position, the first-order (and odd-order) standing waves will not be excited.

一方、第４図に示したように、上下方向に長い
エンクロージヤー１では、その方向でこの装置全
体としての最低次の定在波が発生する。その定在
波は上下寸法H1およびH2の平均的な長さで決ま
る周波数で発生し、そのときの音圧モードの節は
第４図ｂの破線ｅのように形成される。 On the other hand, as shown in FIG. 4, in the enclosure 1 which is long in the vertical direction, the lowest order standing wave of the entire device is generated in that direction. The standing wave is generated at a frequency determined by the average length of the vertical dimensions H 1 and H 2 , and the node of the sound pressure mode at this time is formed as shown by the broken line e in FIG. 4b.

ここで、ｈ＝（H1＋H2）／２とすると定在波
周波数は(1)式を用いれば、約Ｃ／2hとなる。ま
た、節の位置はエンクロージヤー１の内壁上面か
ら、ほぼｈの距離の位置に形成されるので、低音
用スピーカ３ａをバツフル面２のその位置に取り
付ければ、上下方向最低次の定在波は励起しにく
いことになる。 Here, if h=(H 1 +H 2 )/2, the standing wave frequency will be approximately C/2h using equation (1). In addition, since the position of the node is formed at a distance of approximately h from the top surface of the inner wall of the enclosure 1, if the bass speaker 3a is installed at that position on the buttful surface 2, the standing wave of the lowest order in the vertical direction will be generated. is difficult to excite.

さらに第４図の実施例では低音用スピーカ３
ａ，３ｂを左右方向の中央に配置しているので、
その方向の１次（寄数次）定在波は励起されな
い。 Furthermore, in the embodiment shown in FIG.
Since a and 3b are placed in the center in the left and right direction,
The first-order (parochial order) standing waves in that direction are not excited.

また、エンクロージヤー１の寸法Ｄ、Ｗを次の
ように規定すれば、前後および左右方向の定在波
は低音用スピーカ３ａ，３ｂの再生帯域内（＜
fc）で生じないことになる。 Furthermore, if the dimensions D and W of the enclosure 1 are defined as follows, the standing waves in the front and rear and left and right directions are within the reproduction band of the bass speakers 3a and 3b (<
f c ) will not occur.

Ｄ、Ｗ≦Ｃ／fc ……(2) この(2)式は前後および左右方向の２次以上の定
在波をfc以上に生じさせることを意味している。 D, W≦C/f c (2) Equation (2) means that secondary or higher-order standing waves in the front-rear and left-right directions are generated at f c or higher.

第４図の実施例では取り付け板５に低音用スピ
ーカ３ｂを１回取り付けていたが、さらに１個追
加して、それを２次の音圧モードの節の位置に配
置すれば、前後方向の定在波は励起されないこと
になる。 In the embodiment shown in Fig. 4, the bass speaker 3b is attached once to the mounting plate 5, but if one more speaker is added and placed at the node position of the secondary sound pressure mode, Standing waves will not be excited.

この発明において、前記方向の定在波を励起さ
せない他の実施例として第５図のような構成も考
えられる。すなわち第５図ａは正面図、第５図ｂ
は第５図ａにおける５ｂ−５ｂの断面図で、エン
クロージヤー１の下方において前面中央から後方
へ傾斜させた取り付け板５ａ，５ｂを設け、それ
らに低音用スピーカ３ｂ，３ｃを前後方向の中央
に取り付けたものである。 In the present invention, a configuration as shown in FIG. 5 can be considered as another embodiment in which the standing waves in the above direction are not excited. That is, FIG. 5a is a front view, and FIG. 5b is a front view.
5a is a sectional view taken along line 5b-5b in FIG. It was attached to.

このような構成をとることによつて、上記実施
例と同様な効果が得られる。傾斜させて、設ける
取り付け板５ａ，５ｂおよびそれに取り付ける低
音用スピーカ３ｂ，３ｃはどちらか一方でもよ
い。 By adopting such a configuration, effects similar to those of the above embodiment can be obtained. Either one of the mounting plates 5a, 5b and the bass speakers 3b, 3c may be mounted on the mounting plates 5a, 5b at an angle.

上記実施例では、上下方向（または左右方向）
の定在波は１個の低音用スピーカ３ａで対策して
いたが、スピーカを追加して２次モードの節に配
置すれば上下（左右）方向の定在波は励起されな
くなり、よりよい効果が得られる。 In the above example, the vertical direction (or horizontal direction)
The standing waves in the above were countered by using one bass speaker 3a, but if you add a speaker and place it at the node of the secondary mode, the standing waves in the vertical (left and right) directions will no longer be excited, resulting in a better effect. is obtained.

また取り付け板５，５ａ，５ｂはバツフル面２
に対して傾斜させて設けていたが、垂直にしても
よい。 In addition, the mounting plates 5, 5a, 5b are on the flat surface 2.
Although it was installed at an angle with respect to the above, it may be installed perpendicularly.

さらに、上記の例では、２個以上の低音用スピ
ーカを同口径で説明したが、互いに異なつた口径
でもよい。また、エンクロージヤー１は密閉形と
していたが、パスレフ形などであつてもよいこと
は言うまでもない。 Further, in the above example, two or more bass speakers are described as having the same diameter, but they may have different diameters. Further, although the enclosure 1 is of a closed type, it goes without saying that it may be of a pass reflex type or the like.

以上のように、この発明のスピーカ装置によれ
ば、低音用スピーカを２個またはそれ以上用い、
少くとも１個はバツフル面から裏板へ亘る斜めの
取り付け板に配置して前後方向の定在波を対策す
るとともに、他方はバツフル面に取り付け、上下
または左右方向の定在波を対策するようにしたの
で、定在波による音圧特性の乱れがかなり減少
し、ひいてはそれによる音質劣化が少なく、高性
能となる効果がある。 As described above, according to the speaker device of the present invention, two or more bass speakers are used,
At least one is placed on the diagonal mounting plate extending from the buttful surface to the back plate to prevent standing waves in the front and rear direction, and the other is installed on the buttful surface to take measures against standing waves in the vertical or horizontal direction. As a result, disturbances in sound pressure characteristics due to standing waves are considerably reduced, resulting in less deterioration of sound quality and higher performance.

また、エンクロージヤー内で発生する定在波が
少なくなれば、それを対策する吸音材の量も減ら
すことができ、極端な場合には使用しなくてもよ
い可能性があり、コストダウンの効果も期待でき
る。 Additionally, if the number of standing waves generated within the enclosure is reduced, the amount of sound-absorbing material used to counteract it can be reduced, and in extreme cases, it may not be necessary to use it, leading to cost reductions. You can also expect good results.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のスピーカ装置を示す斜視図、第
２図は従来のスピーカ装置の音圧周波数特性図、
第３図は音圧および粒子速度の定在波モード図、
第４図はこの発明の一実施例を示すスピーカ装置
の正面図と中央断面図、第５図はこの発明の他の
実施例を示すスピーカ装置の正面図とそのAA断
面図である。 １……エンクロージヤー、２……バツフル面、
３ａ〜３ｃ……低音用スピーカ、５，５ａ，５ｂ
……取り付け板。なお図中、同一符号は同一、ま
たは相当部分を示す。 Fig. 1 is a perspective view showing a conventional speaker device, Fig. 2 is a sound pressure frequency characteristic diagram of the conventional speaker device,
Figure 3 is a standing wave mode diagram of sound pressure and particle velocity.
FIG. 4 is a front view and a central sectional view of a speaker device showing one embodiment of the present invention, and FIG. 5 is a front view and a sectional view AA thereof of a speaker device showing another embodiment of the invention. 1...Enclosure, 2...Bullet surface,
3a to 3c...bass speaker, 5, 5a, 5b
……Mounting plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】 １ 概略内寸が高さＨ、幅Ｗ、奥行Ｄの寸法をも
つ直方体状エンクロージヤー、および高域カツト
オフ周波数fc以下の周波数で駆動される２個以上
の低音用スピーカで構成されるスピーカ装置にお
いて、上記エンクロージヤーはそのバツフル面の
一部をその面から傾斜させるか、または垂直に裏
板へ亘る取り付け板を設けた構造とし、低音用ス
ピーカの少くとも１個をバツフル面に、他を上記
取り付け板の奥行方向の中央に取り付けたことを
特徴とするスピーカ装置。 ２ 取り付け板に２個以上の低音用スピーカを取
り付けるとともに、それらを奥行方向の１次およ
び２次の定在波音圧モードの節の位置に配置した
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。 ３ バツフル面に取り付ける低音用スピーカは高
さ方向、または幅方向の１次の定在波音圧モード
の節の位置に配置した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。 ４ エンクロージヤーの寸法Ｗ、ＤをＷ≦Ｃ／fc、 Ｄ≦Ｃ／fc（Ｃ：音速）とした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。 ５ バツフル面に取り付ける低音用スピーカを２
個以上とし、それらを高さ方向、または幅方向の
１次および２次の定在波音圧モードの節の位置に
配置した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。 ６ エンクロージヤー内に吸音材を用いないこと
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。[Claims] 1. A rectangular parallelepiped enclosure with approximate internal dimensions of height H, width W, and depth D, and for two or more bass sounds driven at a frequency below the high frequency cutoff frequency f c In a speaker device consisting of a speaker, the enclosure has a structure in which a part of the butt-full surface is inclined from that surface, or a mounting plate extending vertically to the back plate is provided, and at least one of the bass speakers is A speaker device characterized in that one part is mounted on a flat surface and the other part is mounted in the center of the mounting plate in the depth direction. 2. Claim 1, characterized in that two or more bass speakers are attached to the mounting plate, and are arranged at nodes of primary and secondary standing wave sound pressure modes in the depth direction. The speaker device described. 3. The speaker device according to claim 1, wherein the bass speaker attached to the flat surface is arranged at a node of a first-order standing wave sound pressure mode in the height direction or the width direction. 4. The speaker device according to claim 1, wherein dimensions W and D of the enclosure are set such that W≦C/f c and D≦C/f c (C: speed of sound). 5 Attach the bass speaker to the flat surface with two
2. The speaker device according to claim 1, wherein the speaker device has at least two speakers, and is arranged at nodes of primary and secondary standing wave sound pressure modes in the height direction or the width direction. 6. The speaker device according to claim 1, characterized in that no sound absorbing material is used within the enclosure.
JP20501482A 1982-11-22 1982-11-22 Speaker device Granted JPS5994992A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20501482A JPS5994992A (en) 1982-11-22 1982-11-22 Speaker device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20501482A JPS5994992A (en) 1982-11-22 1982-11-22 Speaker device

Publications (2)

Publication Number Publication Date
JPS5994992A JPS5994992A (en) 1984-05-31
JPS6351635B2 true JPS6351635B2 (en) 1988-10-14

Family

ID=16500016

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20501482A Granted JPS5994992A (en) 1982-11-22 1982-11-22 Speaker device

Country Status (1)

Country Link
JP (1) JPS5994992A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6735320B1 (en) * 1993-05-17 2004-05-11 Stephen J. Gertner, Jr. Angled port loudspeaker

Also Published As

Publication number Publication date
JPS5994992A (en) 1984-05-31

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