JPH03143193A - Speaker system - Google Patents
Speaker systemInfo
- Publication number
- JPH03143193A JPH03143193A JP1283252A JP28325289A JPH03143193A JP H03143193 A JPH03143193 A JP H03143193A JP 1283252 A JP1283252 A JP 1283252A JP 28325289 A JP28325289 A JP 28325289A JP H03143193 A JPH03143193 A JP H03143193A
- Authority
- JP
- Japan
- Prior art keywords
- acoustic tube
- acoustic
- tube
- sound
- 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.)
- Granted
Links
Landscapes
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
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の片側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。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker system having an acoustic tube on one side 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。BACKGROUND OF THE INVENTION One conventional technique for extending the bass range of a speaker system is an acoustic maze.
以下、図面を参閘しながら、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なう。Hereinafter, a conventional acoustic maze-shaped speaker system will be explained with reference to the drawings.
第５図は、」１記スピーカシステムの構造断面図を示す
ものである。FIG. 5 shows a structural cross-sectional view of the speaker system described in item 1.
第５図において、１はキャビネント、２ａ、２ｂ２ｃ、
２ｄ、’ｌｅ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. 5, 1 is a cabinet, 2a, 2b2c,
2d and 'le are partition plates provided on the front and rear panels of the cabinet 1, 3 is an opening provided at the bottom of the front panel of the cabinet 1, and 4 is a speaker unit provided at the top of the front panel.
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-shaped speaker system configured as described above will be described below.
キャビネットｌ内に設けられた仕切り板２ａ。A partition plate 2a provided inside the cabinet l.
２ｂ ２ｃ 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。2b, 2c, 2d, and 2e constitute acoustic tubes, and the sound emitted from the rear surface of the speaker unit 4 is guided to the acoustic tube and radiated from its opening. An acoustic tube resonates at a specific frequency determined by its length.
音響管の全長をし、空気中の音速をＣとすると、共振周
波数ｆｎ＝ｃ／４Ｌｘ（２ｎ＋１）、ここでｎ＝０ １
．２．・・・・・・ｎ、となりｎ＝ｏで１／４波長が音
響管長と等しくなり共振現象を生じ、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、％波長
がｆｌ’管長と等しくなる周波数では、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。If the total length of the acoustic tube is C and the speed of sound in the air is C, then the resonance frequency fn=c/4Lx(2n+1), where n=0 1
．． 2.・・・・・・n, and when n=o, the 1/4 wavelength becomes equal to the length of the acoustic tube, causing a resonance phenomenon, and acoustically amplified sound is radiated from the opening 3 of the acoustic tube, and the sound is emitted near the bass reproduction limit. This will greatly improve efficiency. Also, at the frequency where the % wavelength is equal to the fl' tube length, the sound radiated from the front of the speaker unit 4 is compared to the sound from the front.
The sound emitted from the rear surface of the speaker unit 4 from the opening 3 of the sound tube, which is originally in reverse phase, is in phase and added due to a phase delay of half a wavelength, increasing the sound pressure level.
さらにｎ＝２となると、３／４波長が音響管長と等しく
なり音響管に共振現象が生して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
実現できるものであった。Furthermore, when n=2, the 3/4 wavelength becomes equal to the length of the acoustic tube, and a resonance phenomenon occurs in the acoustic tube, similar to the case when n=0.
Acoustically amplified sound is radiated from the opening 3 of the acoustic tube. Therefore, it was possible to realize a speaker system with high efficiency in the bass range.
発明が解決しようとする課題
しかしながら、上記のような構成では１／４波長が音響
管長と等しくなる周波数がスピーカシステムとしての低
音再生限界周波数となるため、低音域を再生するには音
響管を長くする必要があり、キャビネットの形状が大き
くなるという欠点があった。また、低音再生用スピーカ
システムとし使用する時高音域の再生限界として３／４
波長が音響管長と等しくなる周波数付近まで利用して中
高音用スピーカシステムと接合することが望ましいが第
２図で示すように従来の方式では、周波数の上昇ととも
に音響管の共振時における音響放射能率が増大するため
、３／４波長が音響管長と等しくなる周波数１１近では
音圧はピークとなり、電気回路によりこの帯域を平坦化
することは困難であってスピーカシステムとしての特性
を劣化させ音質を低下させていた。Problems to be Solved by the Invention However, in the above configuration, the frequency at which 1/4 wavelength is equal to the length of the acoustic tube is the limit frequency for bass reproduction as a speaker system, so the acoustic tube must be made longer to reproduce the bass range. This had the disadvantage that the cabinet had to be larger in size. Also, when used as a speaker system for bass reproduction, the treble reproduction limit is 3/4.
It is desirable to use up to a frequency near which the wavelength is equal to the acoustic tube length and connect it to a mid-high frequency speaker system, but as shown in Figure 2, in the conventional method, as the frequency increases, the acoustic radiation efficiency at resonance of the acoustic tube decreases. As a result, the sound pressure peaks near frequency 11, where the 3/4 wavelength is equal to the acoustic tube length, and it is difficult to flatten this band with an electric circuit, which deteriorates the characteristics of the speaker system and reduces the sound quality. It was lowering it.
上記問題点に鑑み本発明は音響管を長くすることなく低
音域の再生限界を拡大するとともに、３／４波長が音響
管長と等しくなる周波数付近での音圧のピークを抑制し
て、平坦な低音域特性を有する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 expands the reproduction limit of bass frequencies without increasing the length of the sound tube, and suppresses the sound pressure peak near the frequency where the 3/4 wavelength is equal to the length of the sound tube, resulting in a flat sound. A speaker system having low frequency characteristics is provided.
課題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、
スピーカユニットの前面または背面の一方の側から延長
された第１の音響管とその開口が音場空間に開放された
第２の音響管を配し、この第１．第２の音響管の間に音
響容積を設けた構成を有している。Means for Solving the Problems To achieve this object, the speaker system of the present invention has the following features:
A first sound pipe extending from one side of the front or back side of the speaker unit and a second sound pipe whose opening is open to the sound field space are disposed. It has a configuration in which an acoustic volume is provided between the second acoustic tubes.
作用
本発明は、第１．第２の音響管と音響容積によって構成
され、上記第１．第２の音響管の合成で生しる共振現象
の周波数は上記音響容積の呈する音響容量に応して低下
する。また、音響容量はスピーカユニットから放射され
る中高域を遮断するハイカットフィルターとしても作用
し、再生帯域の上限で生している音圧ピークを抑制する
ものである。Function The present invention has the following features: 1. The second acoustic tube and the acoustic volume are configured by the first acoustic tube and the acoustic volume. The frequency of the resonance phenomenon produced by the synthesis of the second acoustic tube decreases in accordance with the acoustic capacity exhibited by the acoustic volume. The acoustic capacitor also acts as a high-cut filter that cuts off mid-high frequencies emitted from the speaker unit, suppressing sound pressure peaks that occur at the upper limit of the reproduction band.
実施例
以下本発明の実施例について図面を参照しながら説明す
る。EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.
第１図は本発明の第１の実施例におけるスピーカシステ
ムの構造断面図を示すものである。第１図において、５
はスピーカユニット、６はスピーカユニット５の背面に
結合した第１の音響管、７はその開放端、８はその一端
９が閉止した第２の音響管、１０は音場空間に開放され
た第２の音響管８の開放端、１１は第１の音響管６の開
放端７と第２の音響管８の閉止端９との間に構成した音
響容積である。FIG. 1 shows a structural sectional view of a speaker system according to a first embodiment of the present invention. In Figure 1, 5
is a speaker unit, 6 is a first acoustic tube connected to the back of the speaker unit 5, 7 is its open end, 8 is a second acoustic tube whose one end 9 is closed, and 10 is a first acoustic tube that is open to the sound field space. The open end 11 of the second acoustic tube 8 is an acoustic volume formed between the open end 7 of the first acoustic tube 6 and the closed end 9 of the second acoustic tube 8.
以上のように構成されたスピーカシステムについて、以
下その動作について説明する。スピーカユニット５の背
面より放射された音は第１の音響管６を通って、その開
口端７より、第２の音響管８の閉止端９との間に構成し
た音響容積１１に放射される。音響容積ｌｌ内の音は、
第１の音響管６の外壁と第２の音響管８の内壁を通って
、第２の音１８！管８の開放端１０より音場空間に放射
される。従って、第１の音響管６と第２の音響管８は、
音響空間１１によって結合されたものとなり、スピーカ
ユニット５の背面から第２の音響管８の開口端に至る音
響管の等価音響容量が大きくなり音響管に共振現象が生
しる周波数が低下する。第２図は、従来の断面積が−様
な音響管と本発明の音響管を使用した場合の音圧周波数
特性と振動板の振幅特性を比較したものである。音響管
の共振時にはスピーカユニット５の背面からみた音響管
の音響インピーダンスは非常に大きくなり、振動板の振
幅を抑制する。第２図の振幅特性より本発明の音響管に
よって、音響管の共振現象が生しる周波数が低下するこ
とがわかる。これにともない、本発明の音響管によって
、低音再生限界付近での音圧レヘルが上昇し、再生帯域
が拡大できるものである。さらに、音響容積１１の音響
容量がハイカットフィルターとして動作するため、従来
の音響管で３／４波長が音響管長と等しくなる周波数付
近の音圧ビークが、本発明の音響管では抑制されるもの
である。The operation of the speaker system configured as described above will be described below. Sound radiated from the back of the speaker unit 5 passes through the first acoustic tube 6 and is radiated from its open end 7 to the acoustic volume 11 formed between it and the closed end 9 of the second acoustic tube 8. . The sound within the acoustic volume l is
A second sound 18! passes through the outer wall of the first acoustic tube 6 and the inner wall of the second acoustic tube 8! It is radiated into the sound field space from the open end 10 of the tube 8. Therefore, the first acoustic tube 6 and the second acoustic tube 8 are
They are coupled by the acoustic space 11, and the equivalent acoustic capacity of the acoustic tube from the back surface of the speaker unit 5 to the open end of the second acoustic tube 8 increases, and the frequency at which resonance occurs in the acoustic tube decreases. FIG. 2 compares the sound pressure frequency characteristics and the amplitude characteristics of the diaphragm when using a conventional acoustic tube with a similar cross-sectional area and the acoustic tube of the present invention. When the acoustic tube resonates, the acoustic impedance of the acoustic tube as viewed from the back of the speaker unit 5 becomes extremely large, suppressing the amplitude of the diaphragm. From the amplitude characteristics shown in FIG. 2, it can be seen that the sound tube of the present invention lowers the frequency at which the resonance phenomenon of the sound tube occurs. Accordingly, the acoustic tube of the present invention can increase the sound pressure level near the bass reproduction limit and expand the reproduction band. Furthermore, since the acoustic capacity of the acoustic volume 11 operates as a high-cut filter, the sound pressure peak around the frequency where 3/4 wavelength is equal to the acoustic tube length in a conventional acoustic tube is suppressed in the acoustic tube of the present invention. be.
第３図は本発明の第２の実施例におけるスピーカシステ
ムの構造断面図を示すものである。第３図において５は
スピーカユニット、１２はスピーカユニット５の背面に
結合した第１の音響管、１３はその開放端、１４は入力
端１５を、第１の音響管１２の開放端と距離を設けて配
置した第２の音響管、１６は音場空間に音を放射する第
２の音響管１４の開放端、１７は第１の音響管１２と第
２の音響管１４の外側に同軸状にその両端１８１９を閉
止した第３の音響管、２０は第１．第２の音響管１２．
１４の外壁と第３の音響管１７の内壁により構成された
音響容積である。FIG. 3 shows a structural sectional view of a speaker system according to a second embodiment of the present invention. In FIG. 3, 5 is a speaker unit, 12 is a first acoustic tube connected to the back of the speaker unit 5, 13 is an open end thereof, and 14 is an input end 15 connected to the open end of the first acoustic tube 12 at a distance. 16 is an open end of the second acoustic tube 14 that radiates sound into the sound field space; 17 is a coaxial tube disposed outside the first acoustic tube 12 and the second acoustic tube 14; 20 is a third sound tube whose both ends 1819 are closed; Second acoustic tube 12.
14 and the inner wall of the third acoustic tube 17.
以上のように構成されたスピーカシステムにっいて、以
下その動作を説明する。第３図において、スピーカユニ
ット５の背面より出た音は、第１の音響管１２を通って
その開放端１３より、第２の音響管１４の入力端１５と
の間の空間に放射される。この空間は、第１の音響管１
２と第２の音響管１４の外壁と、閉止端１８．１９を有
する第３の音響管１７の内壁により構成された音響空間
２０に音響的に結合される。さらに、この音響空間２０
には入力端１５を有する第２の音響管１４が結合され、
その開放端１６は音場空間と結合されるものである。従
って、本実施例におけるスピーカシステムの基本動作は
、第１図で示した本発明の第１の実施例と同じである。The operation of the speaker system configured as described above will be explained below. In FIG. 3, the sound emitted from the back of the speaker unit 5 passes through the first acoustic tube 12 and is radiated from its open end 13 into the space between it and the input end 15 of the second acoustic tube 14. . This space is the first acoustic tube 1
2, the outer wall of the second acoustic tube 14, and the inner wall of the third acoustic tube 17 having a closed end 18, 19. Furthermore, this acoustic space 20
A second acoustic tube 14 having an input end 15 is coupled to the
The open end 16 is connected to the sound field space. Therefore, the basic operation of the speaker system in this embodiment is the same as that in the first embodiment of the present invention shown in FIG.
第１の実施例と大きく異なるのは、音響容積２０が、第
１、第２の音響管１２．１４の外壁に構成され、閉止端
１８゜１９の位置を両端に広げることにより、第３の音
Ｗ管１７は、小さな外径で大きな音響容積を得ることが
できるため、第１の実施例に比べて、スピーカシステム
の外径形状を小さくすることが可能である。The main difference from the first embodiment is that the acoustic volume 20 is formed on the outer walls of the first and second acoustic tubes 12 and 14, and the positions of the closed ends 18 and 19 are widened to both ends. Since the sound W tube 17 can obtain a large acoustic volume with a small outer diameter, it is possible to make the outer diameter of the speaker system smaller than in the first embodiment.
第４図は、本発明の第３実施例におけるスピーカシステ
ムの構造断面図を示すものである。第４図において、５
はスピーカユニット、２１はスピーカユニット５の背面
に結合した第１の音響管、２２はその開放端、２３は入
力端２４を有する第２の音響管、２５は音場空間と結合
したその開放端、２６は第２の音響管２３の外側に同軸
状に設けた第３の音響管、２７は第２の音響管２３の外
壁に接した閉止端２日は、もう一方の閉止端である。FIG. 4 shows a structural sectional view of a speaker system according to a third embodiment of the present invention. In Figure 4, 5
is a speaker unit, 21 is a first acoustic tube connected to the back of the speaker unit 5, 22 is an open end thereof, 23 is a second acoustic tube having an input end 24, and 25 is an open end thereof connected to the sound field space. , 26 is a third acoustic tube provided coaxially outside the second acoustic tube 23, and 27 is a closed end in contact with the outer wall of the second acoustic tube 23. 2 is the other closed end.
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。スピーカユニット５の背面より
出た音は、第１の音響管２１を通り、第２の音響管２３
の開放端２５より音場空間に放射される。第１の音響管
２１の開１１端２２と第２の音響管２３の入力端２４の
間には、閉止端２７．２８を有する第３の音響管２６に
より構成される音響容積２９が結合されたものとなる。The operation of the speaker system configured as described above will be described below. The sound emitted from the back of the speaker unit 5 passes through the first acoustic tube 21 and then passes through the second acoustic tube 23.
is radiated into the sound field space from the open end 25 of. Between the open end 22 of the first acoustic tube 21 and the input end 24 of the second acoustic tube 23, an acoustic volume 29 is coupled, which is constituted by a third acoustic tube 26 with a closed end 27,28. It becomes something.
従って、本実施例の基本動作は、第１．第２の実施例と
同様なものとなる。第１の実施例と大きく異なるのは、
第３の音響管２６の閉止端２７の位置により、第２の音
響管２３の外壁と第３の音響管２６の内壁により構成さ
れる音響容積２９の大きさを設定できるため、スピーカ
システムの全高を低くできるものである。Therefore, the basic operation of this embodiment is as follows. This is similar to the second embodiment. The main difference from the first embodiment is that
Depending on the position of the closed end 27 of the third acoustic tube 26, the size of the acoustic volume 29 formed by the outer wall of the second acoustic tube 23 and the inner wall of the third acoustic tube 26 can be set, so the total height of the speaker system can be set. can be lowered.
発明の効果
以」−のように本発明は、スピーカシステムの背面に結
合された第１の音響管と、その開放端が音場空間に開放
された第２の音響管を配し、上記第１の音響管と第２の
音響管との間に音響容積を構成することにより、従来の
ストレートな音響管を用いた場合と比べて、低音再生限
界周波数を低下させるとともに、その周波数付近におけ
る音圧レヘルを上ズさせ、低音の再生帯域を拡大するこ
とができる。さらに、本発明の音響管の音響容積によっ
て従来の音響管では３／４波長が音響管長と等しくなる
周波数付近での共振現象により生じる音圧ピークを抑制
し、平坦な音圧特性を有するスピーカシステムが実現で
きる。According to the present invention, a first acoustic tube coupled to the rear surface of a speaker system and a second acoustic tube whose open end is open to the sound field space are disposed, and the above-mentioned By configuring an acoustic volume between the first acoustic tube and the second acoustic tube, the bass reproduction limit frequency is lowered compared to the case of using a conventional straight acoustic tube, and the sound around that frequency is reduced. It is possible to raise the pressure level and expand the bass reproduction band. Furthermore, the acoustic volume of the acoustic tube of the present invention suppresses the sound pressure peak that occurs in conventional acoustic tubes due to the resonance phenomenon near the frequency where 3/4 wavelength is equal to the acoustic tube length, resulting in a speaker system with flat sound pressure characteristics. can be realized.
第１図は本発明の第１の実施例におけるスピーカシステ
ムの構造断面図、第２図は同スピーカシステムと従来の
スピーカシステムの音圧及び振動板の振幅周波数特性図
、第３図は本発明の第２の実施例におけるスピーカシス
テムの構造断面図、第４図は本発明の第３の実施例にお
けるスピーカシステムの構造断面図、第５図は従来のス
ピーカシステムの構造断面図である。
５・・・・・スビーーｈユニット、６ １２ ２１・・
・・・・７ＪＸｌの音響管、８．１４．２３・・・・・
・第２の音響管、１１．２０．２９・・・・・・音Ｖ容
積、２６・・・・・・第３の音響管。FIG. 1 is a structural cross-sectional view of a speaker system according to a first embodiment of the present invention, FIG. 2 is a sound pressure and amplitude frequency characteristic diagram of a diaphragm of the same speaker system and a conventional speaker system, and FIG. 3 is a diagram of the present invention. 4 is a structural sectional view of a speaker system according to a second embodiment of the present invention, FIG. 4 is a structural sectional view of a speaker system according to a third embodiment of the present invention, and FIG. 5 is a structural sectional view of a conventional speaker system. 5...Subeeh unit, 6 12 21...
...7JXl acoustic tube, 8.14.23...
・Second acoustic tube, 11.20.29...Sound V volume, 26...Third acoustic tube.
Claims (4)
ら延長された第１の音響管と、開口が音場空間に開放さ
れた第２の音響管とを配し、前記第１および第２の音響
管との間に音響容積を設けて構成したことを特徴とする
スピーカシステム。(1) A first sound pipe extending from one side of the front or back side of the speaker unit and a second sound pipe having an opening open to the sound field space are disposed, and the first and second sound pipes are disposed. A speaker system characterized in that it is configured by providing an acoustic volume between the acoustic tube and the acoustic tube.
２の音響管を配し、前記第１の音響管の開放端と前記第
２の音響管の閉止端との間に距離を設けて音響容積を構
成したことを特徴とする請求項（１）記載のスピーカシ
ステム。(2) A second acoustic tube with one end closed is disposed coaxially outside the first acoustic tube, and between the open end of the first acoustic tube and the closed end of the second acoustic tube. 2. The speaker system according to claim 1, wherein the acoustic volume is configured by providing a distance.
けて対向させて配置し、前記第１および第２の音響管の
外側に同軸状に両端を閉止した音響管を配して、この閉
止音響管を音響容積とすることを特徴とする請求項（１
）記載のスピーカシステム。(3) The open ends of the first acoustic tube and the second acoustic tube are arranged to face each other with a distance between them, and an acoustic tube with both ends closed coaxially is placed outside the first and second acoustic tubes. Claim (1) characterized in that the closed acoustic tube is arranged as an acoustic volume.
) The speaker system described.
置し、前記第２の音響管の外側に一端は閉止し、他端は
前記第２の音響管の外壁に接合して閉止した第３の音響
管を設け、前記第２の音響管の外壁と前記第３の音響管
の内壁との間に音響容積を構成したことを特徴とする請
求項（１）記載のスピーカシステム。(4) A second acoustic tube is arranged coaxially outside the first acoustic tube, one end is closed outside the second acoustic tube, and the other end is joined to the outer wall of the second acoustic tube. Claim 1, further comprising: a third acoustic tube closed by a third acoustic tube, and an acoustic volume is formed between an outer wall of the second acoustic tube and an inner wall of the third acoustic tube. speaker system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1283252A JP2830198B2 (en) | 1989-10-30 | 1989-10-30 | Speaker system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1283252A JP2830198B2 (en) | 1989-10-30 | 1989-10-30 | Speaker system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03143193A true JPH03143193A (en) | 1991-06-18 |
| JP2830198B2 JP2830198B2 (en) | 1998-12-02 |
Family
ID=17663052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1283252A Expired - Fee Related JP2830198B2 (en) | 1989-10-30 | 1989-10-30 | Speaker system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2830198B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340134C (en) * | 2003-04-01 | 2007-09-26 | 三星电子株式会社 | Loudspeaker device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142986A (en) * | 1986-12-05 | 1988-06-15 | Nec Corp | Television telephone set |
| JPS63149286U (en) * | 1987-03-20 | 1988-09-30 |
-
1989
- 1989-10-30 JP JP1283252A patent/JP2830198B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142986A (en) * | 1986-12-05 | 1988-06-15 | Nec Corp | Television telephone set |
| JPS63149286U (en) * | 1987-03-20 | 1988-09-30 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340134C (en) * | 2003-04-01 | 2007-09-26 | 三星电子株式会社 | Loudspeaker device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2830198B2 (en) | 1998-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5875255A (en) | High power electroacoustic speaker system having wide band frequency response | |
| US5025885A (en) | Multiple chamber loudspeaker system | |
| CN1082780C (en) | Frequency selective acoustic waveguide damping | |
| US5815589A (en) | Push-pull transmission line loudspeaker | |
| US4790408A (en) | Coiled exponential bass/midrange horn loudspeakers | |
| US5111905A (en) | Speaker enclosure | |
| US20070256888A1 (en) | Speaker System With Improved Frequency Response | |
| US8345908B2 (en) | High output loudspeaker | |
| CA2512576C (en) | Ported loudspeaker system and method with reduced air turbulence, bipolar radiation pattern and novel appearance | |
| US4206831A (en) | Loudspeaker coupler | |
| JP2791661B2 (en) | Speaker cabinet | |
| EP0530575A1 (en) | Horn loudspeaker | |
| US2731101A (en) | Loud speaker | |
| US2986229A (en) | Loudspeaker enclosures | |
| JPH06253383A (en) | Speaker device | |
| CN1437427B (en) | New-type loudspeaker system | |
| US2643728A (en) | High fidelity loud-speaker cabinet | |
| JP2707553B2 (en) | Speaker system | |
| JP2884576B2 (en) | Speaker system | |
| JP2653377B2 (en) | Speaker system | |
| CN117061936A (en) | Super bass sound box | |
| US2871972A (en) | Horn for loudspeaker | |
| JP2830198B2 (en) | Speaker system | |
| JPS6282899A (en) | Speaker system | |
| CN108833815A (en) | TV built-in speakers and TV |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |