JPH0632527B2 - Speaker system - Google Patents
Speaker systemInfo
- Publication number
- JPH0632527B2 JPH0632527B2 JP17742787A JP17742787A JPH0632527B2 JP H0632527 B2 JPH0632527 B2 JP H0632527B2 JP 17742787 A JP17742787 A JP 17742787A JP 17742787 A JP17742787 A JP 17742787A JP H0632527 B2 JPH0632527 B2 JP H0632527B2
- Authority
- JP
- Japan
- Prior art keywords
- acoustic
- acoustic tube
- sound
- opening
- speaker system
- 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
Landscapes
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はスピーカユニット背面に音響管を有するスピー
カシステムに関するものである。Description: TECHNICAL FIELD The present invention relates to a speaker system having an acoustic tube on the rear surface of a speaker unit.
従来の技術 スピーカシステムの低音域を拡大する従来の技術の１つ
として、音響迷路形がある。2. Description of the Related Art As one of the conventional techniques for expanding the bass range of a speaker system, there is an acoustic maze type.
以下、図面を参照しながら、従来の音響迷路形のスピー
カシステムについて説明を行う。Hereinafter, a conventional acoustic maze type speaker system will be described with reference to the drawings.
第３図は、上記スピーカシステムの構造断面図を示すも
のである。FIG. 3 is a structural sectional view of the speaker system.
第３図において、１はキャビネット、２ａ，２ｂ，２
ｃ，２ｄ，２ｅはキャビネット１の前面板及び後面板に
設けられた仕切り板、３はキャビネット１の前面板の下
部に設けられた開口、４は前面板の上部に設けられたス
ピーカユニットである。In FIG. 3, 1 is a cabinet, 2a, 2b, 2
Reference numerals c, 2d, and 2e are partition plates provided on the front and rear plates of the cabinet 1, 3 is an opening provided at the bottom of the front plate of the cabinet 1, and 4 is a speaker unit provided at the top of the front plate. .
以上のように構成された音響迷路形のスピーカシステム
について以下その動作を説明する。The operation of the acoustic maze type speaker system configured as described above will be described below.
キャビネット１内に設けられた仕切り板２ａ、２ｂ，２
ｃ，２ｄ，２ｅは音響管を構成するものであり、スピー
カユニット４の背面からでた音は、上記音響管に導かれ
その開口より放射される。音響管はその全長で決まる特
定の周波数で共振する。音響管の全長をＬ、空気中の音
速をＣとすると、共振周波数ｎは、 ｎ＝Ｃ／４Ｌ＊（２ｎ＋１） ここでｎ＝０、１、２、………ｎ となりｎ＝０では音響管内に1/4波長がのって共振を生
じ、音響管の開口３より音響的に増大された音が放射さ
れ低音再生限界付近での大幅な能率向上が図られるもの
である。また、音響管に1/2波長がのる周波数では、ス
ピーカユニット４の前面から放射される音と、前面から
の音に比し、本来逆相となる音響管の開口３から放射さ
れるスピーカユニット４の背面からの音は半波長の位相
遅延のため同相となって加算され音圧レベルが増大する
ものである。さらにｎ＝２となると、音響管内に3/4波
長がのりｎ＝０の場合と同様に、音響管の開口３より音
響的に増大された音が放射される。従って、低音域にお
いて高能率なスピーカシステムを実現出来るものであっ
た。Partition plates 2a, 2b, 2 provided in the cabinet 1
Reference characters c, 2d, and 2e constitute an acoustic tube, and the sound emitted from the back surface of the speaker unit 4 is guided to the acoustic tube and radiated from its opening. The acoustic tube resonates at a specific frequency determined by its total length. Assuming that the total length of the acoustic tube is L and the speed of sound in air is C, the resonance frequency n is n = C / 4L * (2n + 1) where n = 0, 1, 2, ... A 1/4 wavelength is generated in the tube to cause resonance, and an acoustically increased sound is radiated from the opening 3 of the acoustic tube, thereby significantly improving efficiency near the bass reproduction limit. Further, at a frequency of 1/2 wavelength in the acoustic tube, a speaker radiated from the opening 3 of the acoustic tube that is originally in opposite phase to the sound radiated from the front surface of the speaker unit 4 and the sound from the front surface. The sound from the rear surface of the unit 4 is added in the same phase due to the phase delay of a half wavelength, and the sound pressure level increases. Further, when n = 2, acoustically increased sound is radiated from the opening 3 of the acoustic tube, as in the case where the 3/4 wavelength is spread inside the acoustic tube and n = 0. Therefore, it was possible to realize a highly efficient speaker system in the low sound range.
発明が解決しようとする問題点 しかしながら、上記のような構成では、周波数がさらに
上昇し、その波長が音響管の長さと等しくなると、スピ
ーカユニット４の前面から放射される音と、音響管の開
口３から放射されるスピーカユニット４の背面からの音
は逆相となって打消し合い、音圧の大きな谷が生じて第
４図で示すように、低音域の再生帯域は狭いものとなっ
ていた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, when the frequency further rises and its wavelength becomes equal to the length of the acoustic tube, the sound radiated from the front surface of the speaker unit 4 and the opening of the acoustic tube. Sounds radiated from the rear surface of the speaker unit 4 cancel each other out in opposite phases, and a large valley of sound pressure occurs, resulting in a narrow bass reproduction band as shown in FIG. It was
本発明は上記問題点に鑑み、低音域での放射能率の向上
とともに、低音域の再生帯域の広いスピーカシステムを
提供するものである。In view of the above-mentioned problems, the present invention provides a speaker system having a wide reproduction band in the low sound range as well as an improved radioactivity in the low sound range.
問題点を解決するための手段 この目的を達成するため、本発明のスピーカシステム
は、スピーカユニット背面から連続的に延長された長さ
の異なる複数個の音響管が音の進行方向に対して並列的
に配され、上記音響管のそれぞれの出口を結合して、さ
らに連続的に延長する共有の１つの音響管を設け、この
共有の１つの音響管の開口が音場空間に開放された構成
となっている。Means for Solving the Problems In order to achieve this object, a speaker system according to the present invention has a plurality of acoustic tubes of different lengths continuously extended from the back surface of a speaker unit in parallel with a sound traveling direction. Arranged so as to connect the respective outlets of the acoustic tubes to each other, and further to provide a shared continuous acoustic tube, and the opening of the shared acoustic tube is opened to the sound field space. Has become.
作用 本発明は、スピーカユニット背面に長さの異なる複数個
の音響管を配し、その出口を結合してさらに１つ共有の
音響管を設けるものであり、長さの異なる音響管は入口
から共有の音響管の開口にいたる管長によって、その音
響特性を決定される。即ち、１つの音響管の動作を見る
と音響管に一波長がのる周波数ではスピーカユニット前
面と音響管開口から放射される音が逆相となり打消し合
って、音圧の大きな谷が生じる。一方、他の音響管は、
例えば、上記音響管の長さの1/2とするなら、同周波数
で音響管内に半波長がのってスピーカユニットの前面
と、音響管開口から放射される音は半波長の位相遅延の
ため同相となって加算され、音圧レベルが増大する。長
さの異なる音響管の数を増し、音響管の共振と上記位相
遅延効果を連続的に生じさせるならば総合的に広い帯域
にわたって放射能率も向上させることが可能となる。ま
た、長さの異なる音響管のそれぞれの出口を共有の１つ
の音響管に結合されることにより、それぞれの音響管か
らの音、即ち位相の異なる複数の音を共有の音響管内で
合成するため、開口での反射が少なく、音圧の乱れを少
なくすることができるものである。Effect The present invention is to arrange a plurality of acoustic tubes having different lengths on the back surface of the speaker unit, and to connect the outlets thereof to provide another shared acoustic tube. The acoustic length is determined by the length of the shared acoustic tube that leads to the opening. That is, looking at the operation of one acoustic tube, the sound emitted from the front surface of the speaker unit and the opening of the acoustic tube have opposite phases and cancel each other out at a frequency where one wavelength is applied to the acoustic tube, resulting in a large valley of sound pressure. On the other hand, other acoustic tubes
For example, if the length of the acoustic tube is set to 1/2, a half wavelength is placed in the acoustic tube at the same frequency, and the sound radiated from the front of the speaker unit and the acoustic tube opening is a half wavelength phase delay. In-phase is added and the sound pressure level increases. If the number of acoustic tubes having different lengths is increased and the resonance of the acoustic tubes and the phase delay effect are continuously generated, it is possible to improve the radioactivity over a wide band. In addition, by combining the respective outlets of the acoustic tubes having different lengths with one shared acoustic tube, the sounds from the respective acoustic tubes, that is, a plurality of sounds having different phases are synthesized in the shared acoustic tube. Since the reflection at the opening is small, the disturbance of the sound pressure can be reduced.
実施例 以下、本発明の一実施例について図面を参照しながら説
明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明の一実施例におけるスピーカシステム
の一部切欠き斜視図を示すものである。第１図において
５はキャビネット、６ａ〜６ｈは仕切板で、キャビネッ
ト５の内部に途中まで長さの異なる２つの音響管と、そ
の出口に共有の１つの音響管を構成するものである。７
は音響管の開口、８はスピーカユニットであり、実線の
矢印は長い方の音響管を通る音の流れを、破線の矢印は
短い方の音響管を通る音の流れを示すものである。FIG. 1 is a partially cutaway perspective view of a speaker system according to an embodiment of the present invention. In FIG. 1, reference numeral 5 is a cabinet, and 6a to 6h are partition plates, which constitute two acoustic tubes having different lengths in the interior of the cabinet 5 and one shared acoustic tube at the outlet thereof. 7
Is an opening of the acoustic tube, and 8 is a speaker unit. Solid arrows show the sound flow through the longer acoustic tube, and broken arrows show the sound flow through the shorter acoustic tube.
以上のように構成されたスピーカシステムについて、以
下その動作を説明する。まず、キャビネット５内の仕切
板６ａ〜６ｈはスピーカユニット８の背面から連続的に
延長された長さの異なる２つの音響管と、これらの出口
に共有の１つの音響管を構成する。長い音響管に一波長
がのる周波数１では、スピーカユニット８の前面の音
と、共有の音響管の開口７より放射される音は逆相とな
り、第２図で示すように、大きな音圧の谷を生じる。短
い音響管は、その長さを選ぶことにより任意の音響特性
とすることが可能であるが、例えば上記長い音響管の音
圧の谷を打消すように、１で3/4波長がのる管長とす
るならば、第２図で示すように、低音域の再生帯域を大
幅に拡大することが出来るものである。The operation of the speaker system configured as above will be described below. First, the partition plates 6a to 6h in the cabinet 5 constitute two acoustic tubes of different lengths continuously extended from the back surface of the speaker unit 8 and one acoustic tube shared at the outlets thereof. At frequency 1 where one wavelength is spread over the long acoustic tube, the sound on the front surface of the speaker unit 8 and the sound radiated from the opening 7 of the shared acoustic tube have opposite phases, and as shown in FIG. Give rise to the valley. Short acoustic tube, it is possible to any acoustic characteristics by selecting its length, for example to counteract a valley of the sound pressure of the long acoustic tube, 3/4 wavelength rides in 1 With the tube length, as shown in FIG. 2, the bass reproduction range can be greatly expanded.
なお、本実施例では長さの異なる音響管は２個であった
が、２個以上の複数個とするならば、さらに連続的に共
振を生じさせ、より平坦で広い再生帯域を実現すること
が可能となる。In the present embodiment, the number of acoustic tubes having different lengths was two, but if two or more acoustic tubes are used, resonance should be generated continuously to realize a flatter and wider reproduction band. Is possible.
また、本実施例では、音響管は断面積が一定であった
が、開口に進むに従い断面積が大となるホーン状とする
ならばホーンの効果により低音域での放射能率をさらに
増大することが出来るものである。Further, in the present embodiment, the acoustic tube has a constant cross-sectional area, but if it is made into a horn shape whose cross-sectional area becomes larger as it goes to the opening, the horn effect can further increase the radioactivity in the low frequency range. Can be done.
発明の効果 以上のように、本発明はスピーカユニット背面に、連続
的に延長された長さの異なる複数個の音響管が音の進行
方向に対して並列的に配され、上記音響管のそれぞれの
出口を結合して、さらに連続的に延長する共有の１つの
音響管を設け、この共有の１つの音響管の開口が音場空
間に開放された構成とすることにより、音響管の共振を
連続的に発生させ、総合的に低音の広い帯域にわたって
高能率とすることが可能となり、従来に比べて低音特性
に優れたスピーカシステムが実現できるものである。ま
た、各音響管からの位相の異なる音を共有の１つの音響
管内で合成するため、開口での反射が少なく、音圧の乱
れを少なくすることができるものである。EFFECTS OF THE INVENTION As described above, according to the present invention, a plurality of acoustic tubes, which are continuously extended and have different lengths, are arranged in parallel in the sound traveling direction on the back surface of the speaker unit. Resonance of the acoustic tube can be improved by connecting the outlets of the common acoustic tubes that are further extended continuously, and by making the opening of the common acoustic tube open to the sound field space. The speaker system can be continuously generated and can be made highly efficient over a wide range of bass sound comprehensively, and a speaker system having excellent bass characteristics compared to the conventional one can be realized. Further, since the sounds with different phases from the respective acoustic tubes are combined in one shared acoustic tube, the reflection at the opening is small and the disturbance of the sound pressure can be reduced.
第１図は本発明のスピーカシステムの一実施例における
一部切欠き斜視図、第２図は同スピーカシステムの音圧
周波数特性図、第３図は従来のスピーカシステムの構造
断面図、第４図は同スピーカシステムの音圧周波数特性
図である。 ５……キャビネット、６ａ〜６ｈ……仕切板、７……開
口、８……スピーカユニット。FIG. 1 is a partially cutaway perspective view of an embodiment of the speaker system of the present invention, FIG. 2 is a sound pressure frequency characteristic diagram of the same speaker system, and FIG. 3 is a structural sectional view of a conventional speaker system. The figure is a sound pressure frequency characteristic diagram of the speaker system. 5 ... Cabinet, 6a to 6h ... Partition plate, 7 ... Opening, 8 ... Speaker unit.
Claims (4)
れた長さの異なる複数個の音響管が音の進行方向に対し
て並列的に配され、上記音響管のそれぞれの出口を結合
して、さらに連続的に延長する共有の１つの音響管を設
け、この共有の１つの音響管の開口が音場空間に開放さ
れたことを特徴とするスピーカシステム。1. A plurality of acoustic tubes having different lengths continuously extended from the rear surface of a speaker unit are arranged in parallel with respect to a sound traveling direction, and the respective outlets of the acoustic tubes are coupled to each other. A speaker system characterized in that a common acoustic tube extending continuously is provided, and an opening of the common acoustic tube is opened to a sound field space.
なるホーン形状であることを特徴とする特許請求の範囲
第１項記載のスピーカシステム。2. The speaker system according to claim 1, wherein the acoustic tube has a horn shape whose cross-sectional area increases as it goes to the opening.
なる複数個の音響管で構成したことを特徴とする特許請
求の範囲第１項記載のスピーカシステム。3. The loudspeaker system according to claim 1, wherein a portion of approximately less than half of the total length of the acoustic tube is composed of a plurality of acoustic tubes having different lengths.
１つの長さをｌ１、他の１つの長さをｌ２とした時、ｌ
１＞ｌ２≧ｌ１／２としたことを特徴とする特許請求の
範囲第１項記載のスピーカシステム。4. When the length of one acoustic tube from the entrance to the opening of the sound field space is l1 and the length of the other one is l2, l
The speaker system according to claim 1, wherein 1 > l 2 ≧ l 1/2 .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17742787A JPH0632527B2 (en) | 1987-07-16 | 1987-07-16 | Speaker system |
| US07/204,523 US4930596A (en) | 1987-06-16 | 1988-06-09 | Loudspeaker system |
| DE88109508T DE3883624T2 (en) | 1987-06-16 | 1988-06-15 | Speaker system. |
| EP88109508A EP0295641B1 (en) | 1987-06-16 | 1988-06-15 | Loudspeaker system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17742787A JPH0632527B2 (en) | 1987-07-16 | 1987-07-16 | Speaker system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6420797A JPS6420797A (en) | 1989-01-24 |
| JPH0632527B2 true JPH0632527B2 (en) | 1994-04-27 |
Family
ID=16030744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17742787A Expired - Lifetime JPH0632527B2 (en) | 1987-06-16 | 1987-07-16 | Speaker system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632527B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6085583B2 (en) * | 2014-05-23 | 2017-02-22 | 本田技研工業株式会社 | Vehicle speaker device |
-
1987
- 1987-07-16 JP JP17742787A patent/JPH0632527B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6420797A (en) | 1989-01-24 |
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