JPH0638284A - Phase inversion type speaker equipment - Google Patents
Phase inversion type speaker equipmentInfo
- Publication number
- JPH0638284A JPH0638284A JP20981292A JP20981292A JPH0638284A JP H0638284 A JPH0638284 A JP H0638284A JP 20981292 A JP20981292 A JP 20981292A JP 20981292 A JP20981292 A JP 20981292A JP H0638284 A JPH0638284 A JP H0638284A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- speaker
- speaker cabinet
- baffle plate
- sound
- 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
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000007547 defect Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 230000011514 reflex Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 238000005766 Middleton reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000034 method Methods 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
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スピーカの低域限界の
下限を伸ばすための位相反転式スピーカに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase inversion type speaker for extending the lower limit of the low frequency range of the speaker.
【０００２】[0002]
【従来技術】位相反転式スピーカ装置は、スピーカシス
テムの低域再生限界を伸ばす有効な手段の１つである。
その原理は、ダクト内の空気の質量とスピーカキャビネ
ット内の空気のスティフネスによって一意的に決まる周
波数で共振させることにより、スピーカシステムの低域
限界の下限が伸ばされる。2. Description of the Related Art A phase inversion type speaker device is one of effective means for extending the low frequency reproduction limit of a speaker system.
The principle is to resonate at a frequency that is uniquely determined by the mass of air in the duct and the stiffness of air in the speaker cabinet, thereby extending the lower limit of the lower limit of the speaker system.
【０００３】そして一般には図１に示すように、スピー
カキャビネット１のバッフル板２にバスレフダクト４と
称する筒を設け、低音再生用のスピーカ３の背面から放
射された音圧によって生じる音波を開口部４ａから入り
込ませ、バスレフダクト４を通してバッフル板２側の開
口部４ｂから放射させる。このとき、開口部４ｂから放
射される音波を低音再生用のスピーカ３の前面からの音
圧及び位相に合わせることにより、その目的が達成され
る。In general, as shown in FIG. 1, a baffle plate 2 of a speaker cabinet 1 is provided with a cylinder called a bass reflex duct 4, and a sound wave generated by a sound pressure emitted from the rear surface of a speaker 3 for bass reproduction is opened. It is made to enter from 4a, and it radiates from the opening 4b on the side of the baffle plate 2 through the bass reflex duct 4. At this time, the purpose is achieved by adjusting the sound wave radiated from the opening 4b to the sound pressure and phase from the front surface of the speaker 3 for low-pitched sound reproduction.
【０００４】なお、同図において、符号５は中高音再生
用のスピーカ、符号４ｃはバスレフダクト４自体の固有
振動によって発生する音波を吸収するためのサブダクト
をそれぞれ示している。In the figure, reference numeral 5 indicates a speaker for reproducing high and middle tones, and reference numeral 4c indicates a sub-duct for absorbing sound waves generated by the natural vibration of the bass reflex duct 4 itself.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述し
た従来の位相反転式スピーカ装置によれば、バスレフダ
クト４を通してバッフル板２側の開口部４ｂから音波が
放射される際、音圧の反作用により図中矢印で示す逆向
きの力を受けるので、この力によりスピーカキャビネッ
ト１が振動してしまう。このようにスピーカキャビネッ
ト１が振動してしまうと、たとえば音源位置が定まらな
くなってしまい、所望の音像が得られなくなってしまう
場合もある。However, according to the above-described conventional phase inversion type speaker device, when a sound wave is radiated from the opening 4b on the side of the baffle plate 2 through the bass reflex duct 4, it is caused by a reaction of sound pressure. The speaker cabinet 1 vibrates due to the force in the opposite direction indicated by the middle arrow. If the speaker cabinet 1 vibrates in this way, for example, the sound source position may not be determined, and a desired sound image may not be obtained.
【０００６】本発明は、このような事情に対処してなさ
れたもので、スピーカキャビネットの振動を防ぐことに
より、特に低周波域の音像位置の明確化を図ることがで
きる位相反転式スピーカ装置を提供することを目的とす
る。The present invention has been made in consideration of such circumstances, and a phase inversion type speaker device capable of clarifying a sound image position particularly in a low frequency region by preventing vibration of a speaker cabinet. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記した目的
を達成するために、スピーカキャビネットに低音再生用
のスピーカの低域限界の下限を伸ばすためのダクトを設
けた位相反転式スピーカ装置において、前記ダクトは、
前記スピーカキャビネットのバッフル板とこのバッフル
板に対向する裏板との間に連結され、これらバッフル板
及び裏板に前記スピーカからの音圧による同位相の音波
を放射するための開口部を形成する第１ダクトと、この
第１ダクトの略中間に結合され、前記スピーカからの音
圧による音波を取込むための第２ダクトとからなること
を特徴とする。In order to achieve the above-mentioned object, the present invention provides a phase inversion type speaker device in which a speaker cabinet is provided with a duct for extending the lower limit of the low range limit of a speaker for bass reproduction. , The duct is
The baffle plate of the speaker cabinet is connected between a baffle plate and a back plate facing the baffle plate, and openings are formed in the baffle plate and the back plate to emit sound waves of the same phase due to sound pressure from the speaker. It is characterized in that it is composed of a first duct and a second duct which is coupled to approximately the middle of the first duct and which takes in a sound wave by the sound pressure from the speaker.
【０００８】[0008]
【作用】本発明の位相反転式スピーカ装置では、スピー
カキャビネットのバッフル板と裏板との間に連結された
第１ダクトの開口部から放射される音圧による同位相の
音波による反作用の力の向きをそれぞれ逆向きとした。In the phase inversion type speaker device of the present invention, the reaction force due to the sound wave of the same phase due to the sound pressure radiated from the opening of the first duct connected between the baffle plate and the back plate of the speaker cabinet is eliminated. The directions were opposite.
【０００９】したがって、放射音圧によるスピーカキャ
ビネットに悪影響を及ぼす反作用の力が相殺され、スピ
ーカキャビネットの振動が極力抑制されるので、たとえ
ば従来のようにスピーカキャビネット自体が振動するこ
とによる不具合を解消することができる。Therefore, the reaction force that adversely affects the speaker cabinet due to the radiated sound pressure is canceled out, and the vibration of the speaker cabinet is suppressed as much as possible. Therefore, for example, the problem caused by the conventional vibration of the speaker cabinet itself is solved. be able to.
【００１０】[0010]
【実施例】以下、本発明の実施例の詳細を図面に基づい
て説明する。なお、以下に説明する図において、図１と
共通する部分には同一符号を付し重複する説明を省略す
る。Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIG. 1 are designated by the same reference numerals, and overlapping description will be omitted.
【００１１】図２は、本発明の位相反転式スピーカ装置
の一実施例を示すもので、１はスピーカキャビネット、
２はバッフル板、３，５はスピーカ、４は略Ｔ字形状の
バスレフダクト、６は裏板をそれぞれ示している。FIG. 2 shows an embodiment of the phase inversion type speaker device of the present invention, in which 1 is a speaker cabinet,
Reference numeral 2 is a baffle plate, 3 and 5 are speakers, 4 is a substantially T-shaped bass reflex duct, and 6 is a back plate.
【００１２】ここで、バスレフダクト４は、バッフル板
２と裏板６とを連通する第１ダクト４ｅ及び一端が第１
ダクト４ｅの略中間部位に結合された第２ダクト４ｆか
ら構成されている。またここで、第１ダクト４ｅの断面
積は第２ダクト４ｆの２倍とされている。また、低音再
生用のスピーカ３から開口部４ａを経由して開口部４ｂ
に至るまでの距離と、同じく開口部４ｄまで至る距離と
はほぼ同じくされている。Here, the bass reflex duct 4 has a first duct 4e which connects the baffle plate 2 and the back plate 6 and one end of which is first.
The second duct 4f is connected to a substantially middle portion of the duct 4e. Further, here, the cross-sectional area of the first duct 4e is twice that of the second duct 4f. In addition, the opening 4b is passed from the speaker 3 for low-frequency reproduction through the opening 4a.
And the distance to the opening 4d are substantially the same.
【００１３】次に、上述した構成のバスレフダクト４に
よる作用について説明する。まず、低音再生用のスピー
カ３の背面から放射された音圧による音波は、第２ダク
ト４ｆの開口部４ａに入り込む。第２ダクト４ｆ内部を
進行する音波は、第１ダクト４ｅに到達すると、第１ダ
クト４ｅの略中間部位にて左右に別れ、バッフル板２側
の開口部４ｂ及び裏板６の開口部４ｄからそれぞれ放射
される。ここで、低音再生用のスピーカ３から開口部４
ａを経由して開口部４ｂに至るまでの距離と、同じく開
口部４ｄまで至る距離とは上述したようにほぼ同じであ
るため、開口部４ｂ及び開口部４ｄからは同位相の音圧
による音波が逆向きに放射される。Next, the operation of the bass reflex duct 4 having the above structure will be described. First, the sound wave generated by the sound pressure emitted from the back surface of the speaker 3 for low-pitched sound reproduction enters the opening 4a of the second duct 4f. When the sound wave traveling inside the second duct 4f reaches the first duct 4e, it splits into right and left at a substantially middle portion of the first duct 4e, and from the opening 4b on the side of the baffle plate 2 and the opening 4d of the back plate 6. Each is emitted. Here, from the speaker 3 for low-pitched sound reproduction to the opening 4
Since the distance to the opening 4b via a and the distance to the opening 4d are substantially the same as described above, sound waves generated by the sound pressure of the same phase from the openings 4b and 4d. Is emitted in the opposite direction.
【００１４】よって、同図に示すように、それぞれの音
圧の矢印で示す反作用の力はそれぞれ同位相であり、且
つ逆向きにスピーカキャビネット１に対して働くので、
それぞれの反作用は相殺される。Therefore, as shown in the figure, since the reaction forces indicated by the arrows of the respective sound pressures have the same phase and act in the opposite directions on the speaker cabinet 1,
Each reaction is offset.
【００１５】図３は、上述した反作用の相殺効果による
スピーカキャビネット１の振動レベルを従来のものと比
較した場合を示すものである。なお、同図に示す特性図
においては、両者共にバスレフダクト４の形状が異なる
のみで、スピーカキャビネット１やスピーカ３，５はそ
れぞれ同じものを使用している。但し、開口部４ａの断
面積においては、それぞれ同じ値とされている。また、
上述した他の諸条件も同じとされている。FIG. 3 shows a case where the vibration level of the speaker cabinet 1 due to the canceling effect of the above-mentioned reaction is compared with that of the conventional one. In the characteristic diagram shown in the same figure, only the shape of the bass reflex duct 4 is different between them, and the same speaker cabinet 1 and speakers 3 and 5 are used. However, the cross-sectional areas of the openings 4a have the same value. Also,
The other conditions described above are also the same.
【００１６】同図に示す通り、本実施例方式による場
合、従来方式に比べて４０〜１５０ＨZ 付近の振動レベ
ルの減衰が顕著に現れていることが解る。As shown in the figure, it can be seen that in the case of the method of the present embodiment, the attenuation of the vibration level in the vicinity of 40 to 150 Hz is remarkable as compared with the conventional method.
【００１７】このように本実施例では、バッフル板２と
裏板６とに連通された第１ダクト４ｅの開口部４ｂ，４
ｄから放射される同位相の音圧による反作用の向きをそ
れぞれ逆向きとし、放射音圧による反作用を相殺するよ
うにしたので、スピーカキャビネット１の振動を極力抑
制することができる。したがって、たとえば従来のよう
にスピーカキャビネット１自体が振動することによる不
具合が解消されるので、特に低周波域の音像位置の明確
化が図れる。As described above, in this embodiment, the openings 4b, 4 of the first duct 4e communicating with the baffle plate 2 and the back plate 6 are connected.
Since the reaction directions due to the sound pressure of the same phase radiated from d are set in opposite directions to cancel the reaction reactions due to the radiated sound pressure, the vibration of the speaker cabinet 1 can be suppressed as much as possible. Therefore, for example, the problem caused by the vibration of the speaker cabinet 1 itself as in the related art is solved, so that the sound image position particularly in the low frequency region can be clarified.
【００１８】また、本実施例では、バッフル板２と裏板
６とを第１ダクト４ｅにより連結した構成としたので、
バスレフダクト４がスピーカキャビネット１の補強材と
して作用する。したがって、スピーカキャビネット１の
剛性が高められるので、外部振動や上述した反作用の力
による振動に対してもスピーカキャビネット１を振動し
にくい構造とすることができる。Further, in this embodiment, since the baffle plate 2 and the back plate 6 are connected by the first duct 4e,
The bass reflex duct 4 acts as a reinforcing material for the speaker cabinet 1. Therefore, since the rigidity of the speaker cabinet 1 is increased, it is possible to make the speaker cabinet 1 less likely to vibrate against external vibration or vibration due to the reaction force described above.
【００１９】なお、本実施例における第１ダクト４ｅに
あっては、略中間部位を湾曲させた形状のものを示して
いるが、この例に限らず第１ダクト４ｅを直線状とする
ことにより、更に強い補強材として作用するので、スピ
ーカキャビネット１の剛性を更に高めることができる。Although the first duct 4e in this embodiment has a shape in which a substantially middle portion is curved, the present invention is not limited to this example, and the first duct 4e may be formed in a straight shape. Further, since it acts as a stronger reinforcing material, the rigidity of the speaker cabinet 1 can be further increased.
【００２０】[0020]
【発明の効果】以上説明したように、本発明の位相反転
式スピーカ装置によれば、スピーカキャビネットの前面
及び背面との間に連結された第１ダクトの開口部から放
射される音圧による同位相の音波による反作用の向きを
それぞれ逆向きとした。As described above, according to the phase inversion type speaker device of the present invention, the sound pressure radiated from the opening of the first duct connected between the front surface and the back surface of the speaker cabinet causes the same sound pressure. The directions of the reaction by the phase sound waves were set to the opposite directions.
【００２１】したがって、放射音圧によるスピーカキャ
ビネットに作用するための反作用が相殺され、スピーカ
キャビネットの振動が極力抑制されるので、たとえば従
来のようにスピーカキャビネット自体が振動することに
よる不具合を解消することができ、これにより特に低周
波域の音像位置の明確化を図ることができる。Therefore, the reaction due to the radiated sound pressure acting on the speaker cabinet is canceled out, and the vibration of the speaker cabinet is suppressed as much as possible. For example, it is possible to eliminate the problem caused by the conventional vibration of the speaker cabinet itself. This makes it possible to clarify the sound image position particularly in the low frequency range.
【図１】従来のバスレフダクトを備えたスピーカ装置の
一例を示す断面図である。FIG. 1 is a sectional view showing an example of a speaker device provided with a conventional bass reflex duct.
【図２】本発明の位相反転式スピーカ装置の一実施例を
示す断面図である。FIG. 2 is a cross-sectional view showing an embodiment of the phase inversion type speaker device of the present invention.
【図３】図２のバスレフダクトの反作用の相殺効果によ
るスピーカキャビネットの振動レベルを従来のものと比
較した場合を示す図である。FIG. 3 is a diagram showing a case where a vibration level of a speaker cabinet due to a canceling effect of a reaction of the bass reflex duct of FIG. 2 is compared with a conventional one.
１ スピーカキャビネット ２ バッフル板 ３，５ スピーカ、 ４ バスレフダクト ６ 裏板 ４ｅ 第１ダクト ４ｆ 第２ダクト ４ｂ，４ｄ 開口部 1 Speaker Cabinet 2 Baffle Plates 3, 5 Speakers, 4 Bass Reflex Duct 6 Back Plate 4e 1st Duct 4f 2nd Duct 4b, 4d Opening
Claims (1)
ピーカの低域限界の下限を伸ばすためのダクトを設けた
位相反転式スピーカ装置において、 前記ダクトは、 前記スピーカキャビネットのバッフル板とこのバッフル
板に対向する裏板との間に連結され、これらバッフル板
及び裏板に前記スピーカからの音圧による同位相の音波
を放射するための開口部を形成する第１ダクトと、 この第１ダクトの略中間に結合され、前記スピーカから
の音圧による音波を取込むための第２ダクトとからなる
ことを特徴とする位相反転式スピーカ装置。1. A phase inversion type speaker device in which a speaker cabinet is provided with a duct for extending a lower limit of a low frequency range of a speaker for bass reproduction, wherein the duct faces a baffle plate of the speaker cabinet and the baffle plate. A first duct which is connected between the baffle plate and the back plate and which forms an opening for radiating a sound wave of the same phase due to the sound pressure from the speaker; and a substantially middle portion of the first duct. And a second duct for taking in a sound wave due to the sound pressure from the speaker, the phase inversion type speaker device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20981292A JPH0638284A (en) | 1992-07-14 | 1992-07-14 | Phase inversion type speaker equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20981292A JPH0638284A (en) | 1992-07-14 | 1992-07-14 | Phase inversion type speaker equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0638284A true JPH0638284A (en) | 1994-02-10 |
Family
ID=16579019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20981292A Pending JPH0638284A (en) | 1992-07-14 | 1992-07-14 | Phase inversion type speaker equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638284A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013122957A1 (en) * | 2012-02-13 | 2013-08-22 | Wilson Audio Specialties, Inc. | Loudspeaker with reversible sound port |
| WO2015145774A1 (en) * | 2014-03-28 | 2015-10-01 | パイオニア株式会社 | Speaker system |
-
1992
- 1992-07-14 JP JP20981292A patent/JPH0638284A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013122957A1 (en) * | 2012-02-13 | 2013-08-22 | Wilson Audio Specialties, Inc. | Loudspeaker with reversible sound port |
| WO2015145774A1 (en) * | 2014-03-28 | 2015-10-01 | パイオニア株式会社 | Speaker system |
| US9854339B2 (en) | 2014-03-28 | 2017-12-26 | Pioneer Corporation | Speaker system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3144230B2 (en) | Bass reproduction speaker | |
| US4437540A (en) | Loud-speaker | |
| JP3792263B2 (en) | Acoustic tube speaker system | |
| US4168762A (en) | Loudspeaker enclosure | |
| US5150418A (en) | Speaker system | |
| US3430728A (en) | Loudspeaker assembly with loudspeaker supported by vibratory diaphragm | |
| JP2002159083A (en) | Speaker unit for reproducing low-frequency band | |
| US4325454A (en) | Speaker system which inverts and redirects the speaker backwave | |
| US3275100A (en) | Loudspeaker assembly having loudspeaker wholly supported by vibratory diaphragm | |
| EP1229760B1 (en) | Speaker system | |
| JPH0324900A (en) | Speaker device | |
| JPH0638284A (en) | Phase inversion type speaker equipment | |
| JPH03267899A (en) | Phase inversion type speaker | |
| JPH11219180A (en) | Speaker device for electronic keyboard instrument | |
| JPH02301395A (en) | Speaker system | |
| JPH03269595A (en) | Electronic musical instrument | |
| JP3648873B2 (en) | Vehicle acoustic device | |
| JPH03108999A (en) | Speaker system | |
| JP2580383B2 (en) | Speaker system | |
| JPH04192795A (en) | Speaker device for television receiver | |
| JPH01887A (en) | speaker system | |
| JP2512199B2 (en) | Speaker system | |
| JPH0470199A (en) | Phase inverting type speaker system | |
| JPH0662484A (en) | Speaker system of bass reflex system | |
| JP2003079834A (en) | Speaker system for game machine |