JPH0422296A - On-vehicle speaker system - Google Patents
On-vehicle speaker systemInfo
- Publication number
- JPH0422296A JPH0422296A JP12768590A JP12768590A JPH0422296A JP H0422296 A JPH0422296 A JP H0422296A JP 12768590 A JP12768590 A JP 12768590A JP 12768590 A JP12768590 A JP 12768590A JP H0422296 A JPH0422296 A JP H0422296A
- Authority
- JP
- Japan
- Prior art keywords
- speaker
- front door
- door
- duct
- sound wave
- 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
- 230000011514 reflex Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、自動車の車室内でカーステレオ等のオーデ
ィオ再生を行う際、十分な重低音を再生する車載スピー
カシステムに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an in-vehicle speaker system that reproduces sufficient deep bass when audio is reproduced from a car stereo or the like in the interior of an automobile.
従来、第７図に示すように、自動車の車室内では、フロ
ントドア１にオーディオ再生系のスピーカ２を取付け、
フロントドア１内の容積を利用して低音再生を行うこと
が行われている。この方法では乗員にとってスピーカ２
の前方から聞える、自然な低音を再生できる利点がある
。しかし、フロントドアｌにはドア内部の機構部品や、
電気部品の修理、保守作業を行うための作業用開孔６ａ
〜６Ｃが設けられている。Conventionally, as shown in FIG. 7, in the interior of a car, an audio reproduction speaker 2 is attached to the front door 1.
The volume inside the front door 1 is used to reproduce bass sounds. In this method, the passenger can hear the loudspeaker 2.
It has the advantage of being able to reproduce natural bass that can be heard from the front. However, the front door l has mechanical parts inside the door,
Working hole 6a for repairing and maintaining electrical parts
~6C is provided.
従来の車載スピーカシステムは以上のようなので、重低
音域では、スピーカの後方に放射される逆位相の音波が
フロントドア内部の空間を伝搬して、その作業用開孔か
ら漏れ出し、スピーカの前方に放射された音波を打ち消
すように働き、重低音が十分に再生できない課題があっ
た。Conventional car-mounted speaker systems are as described above, so in the deep bass range, the sound waves of opposite phase emitted behind the speaker propagate through the space inside the front door, leak through the working hole, and are emitted from the front of the speaker. There was an issue with the ability to cancel out the sound waves emitted by the system, making it impossible to reproduce deep bass tones adequately.
この作業用開孔は、作業性を重視して、スピーカの近傍
やドア中央部に設けられているために、音波の打ち消し
を生じやすい傾向を有していた。Since this working hole is provided near the speaker or in the center of the door with emphasis on workability, it tends to cause cancellation of sound waves.
又、作業用開孔を塞いで密閉キャビネットにしても、ド
ア内部の容積が小さいために十分な重低音を再生できな
いなどの課題があった。Furthermore, even if the working opening is closed to create a closed cabinet, there are problems such as the inability to reproduce sufficient deep bass sounds due to the small volume inside the door.
この発明は上記のような課題を解決するためになされた
もので、前方から十分な音圧で聞える重低音を再生する
ことのできる車載スピーカシステムを得ることを目的と
する。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a vehicle-mounted speaker system that can reproduce deep bass sounds that can be heard from the front with sufficient sound pressure.
この発明の車載スピーカシステムは、スピーカを取付け
た自動車のドアに、位相反転形構造となるように開孔又
はダクトを設けたものである。In the vehicle-mounted speaker system of the present invention, an opening or a duct is provided in the door of an automobile to which a speaker is attached so as to form a phase-inverted structure.
この発明における車載スピーカシステムは、重低音帯域
において、スピーカからドア内部に放射された音波の位
相を開孔又はダクトを通して反転させて、ドア外部にス
ピーカから直接放射された音波と同位相にし、重低音域
の音圧を増加させる。The in-vehicle speaker system of the present invention reverses the phase of the sound wave emitted from the speaker to the inside of the door in the deep bass band through an opening or a duct, so that it is in the same phase as the sound wave directly emitted from the speaker to the outside of the door. Increases sound pressure in the bass range.
以下、この発明の各実施例を図について説明する。第１
図は自動車の右側のフロントドアの車室内側からの外観
を示したものである。第２図はそのフロントドアの概略
横断面図である。第１図及び第２図において、１はフロ
ントドア、２はフロントドア１の下半部の車室側壁面に
取付けられたスピーカ、３はフロントドア１のその車室
側壁面に設けられフロントドア１を位相反転形（バスレ
フ； Ｂａ５ｓ−Ｒｅｆｌｅｘ）構造にするバスレフ開
孔、４は窓ガラスである。本実施例では、スピーカ２と
バスレフ開孔３とがフロントドア１の前後に離れて互い
に真横に位置している例を示している。Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows the appearance of the right front door of an automobile from inside the cabin. FIG. 2 is a schematic cross-sectional view of the front door. In FIGS. 1 and 2, 1 is a front door, 2 is a speaker installed on the wall of the lower half of the front door 1 on the side of the passenger compartment, and 3 is a speaker installed on the wall of the front door 1 on the side of the passenger compartment of the front door. 1 is a bass reflex hole having a phase inversion type (bass reflex; Ba5s-Reflex) structure, and 4 is a window glass. In this embodiment, an example is shown in which the speaker 2 and the bass reflex aperture 3 are separated from each other in the front and back of the front door 1 and are located directly next to each other.
フロントドア１に取付けられたスピーカ２がら放射され
る音波は、スピーカ２の振動板の前方、よってドア外部
に放射される音波と、スピーカ２の振動板後方、よって
ドア内部に放射される音波に大別される。フロントドア
１内部にスピーカ１から放射された音波は、フロントド
ア１の内部空間を伝搬して、バスレフ開孔３に達し、バ
スレフ開孔３からドア外部の車室内に放射される。The sound waves radiated from the speaker 2 attached to the front door 1 are divided into two types: one in front of the diaphragm of the speaker 2, and therefore to the outside of the door, and the other, the sound wave radiated to the rear of the diaphragm of the speaker 2, and therefore inside the door. Broadly classified. The sound waves emitted from the speaker 1 into the interior of the front door 1 propagate through the interior space of the front door 1, reach the bass reflex aperture 3, and are radiated from the bass reflex aperture 3 into the vehicle interior outside the door.
この時の動作は公知の文献；音響工学［上巻］翻訳本、
無線従事者教育協会発行、１９５９年版、１９１頁、ｒ
６−１２、位相反転スピーカ」から、第３図にフロント
ドアの概略横断面図と共に示した等価回路で表わされる
。第３図において、ｍｃは振動板とボイスコイルの質量
、ｃｏは支持体のコンプライアンス、ｒ□は支持板の機
械抵抗、ｍ＾は空気負荷の質量、ｒＮＡは空気負荷の機
械抵抗、ＣＩＩＶはドア内部のコンプライアンス、ｍＬ
はバスレフ開孔３の付加質量、ｒ□はバスレフ開孔３の
空気負荷の機械抵抗、ｆ７はボイスコイルに生じる駆動
力である。等価回路中の回路■と■が正の機械リアクタ
ンスをもち機械抵抗がなく、そのうえ回路■に純コンプ
ライアンスがあるときには、回路■との速度の位相差を
１８０゛にすることができる。従って、スピーカ２の振
動板の両面における速度は１８０°の位相差をもつから
、その位相差をなくすことができる。The operation at this time is known from the known literature; Acoustic Engineering [Volume 1] translated book,
Published by Radio Operator Education Association, 1959 edition, 191 pages, r
6-12, Phase Inversion Speaker" is represented by an equivalent circuit shown in FIG. 3 together with a schematic cross-sectional view of the front door. In Figure 3, mc is the mass of the diaphragm and voice coil, co is the compliance of the support, r□ is the mechanical resistance of the support plate, m^ is the mass of the air load, rNA is the mechanical resistance of the air load, and CIIV is the door. Internal compliance, mL
is the additional mass of the bass reflex hole 3, r□ is the mechanical resistance of the air load on the bass reflex hole 3, and f7 is the driving force generated in the voice coil. When circuits (2) and (2) in the equivalent circuit have positive mechanical reactance and no mechanical resistance, and furthermore, circuit (2) has pure compliance, the phase difference in speed with circuit (2) can be set to 180 degrees. Therefore, since the velocities on both sides of the diaphragm of the speaker 2 have a phase difference of 180°, this phase difference can be eliminated.
フロントドア１内部のコンプライアンスＣＭＶとバスレ
フ開孔３の付加質量ｍ□が、ヘルムホルツの共鳴によっ
て特定の周波数で共振し、バスレフ開孔３から外部に音
を放射する。この周波数（***振周波数）は、
と表わされる。ドア内部のコンプライアンスＣ１，／は
フロントドア１の内容積から求められる。ドア容積を公
知の手段で近似的に測定して求めた値からコンプライア
ンスＣ□を求め、（１）式から***振周波数ｆ、と付加
質量ｍＬの関係を特定することができる。The compliance CMV inside the front door 1 and the additional mass m□ of the bass reflex aperture 3 resonate at a specific frequency due to Helmholtz resonance, and sound is radiated from the bass reflex aperture 3 to the outside. This frequency (anti-resonance frequency) is expressed as follows. The compliance C1,/ inside the door is determined from the internal volume of the front door 1. Compliance C□ is obtained from a value obtained by approximately measuring the door volume by a known means, and the relationship between antiresonance frequency f and additional mass mL can be specified from equation (1).
上記（１）式の関係から希望する***振周波数ｆ。Desired anti-resonance frequency f from the relationship in equation (1) above.
に対応する付加質量を知ることができ、その付加質量を
もつバスレフ開孔３の形状を決定することができる。It is possible to know the additional mass corresponding to , and determine the shape of the bass reflex aperture 3 having that additional mass.
第２図及び第３図には、バスレフ開孔のみを示したが、
第４図にフロントドアの概略横断面を示すように、バス
レフ開孔部に真直ぐなダクト５をフロントドア１の内側
に設けても良い。この場合、上述と同様に（１）式を満
たすように、ダクト径、ダクト長さを調整すれば良い。Although only the bass reflex hole is shown in Figures 2 and 3,
As shown in a schematic cross section of the front door in FIG. 4, a straight duct 5 may be provided inside the front door 1 in the bass reflex opening. In this case, the duct diameter and duct length may be adjusted so as to satisfy equation (1) as described above.
以下に、口径１６ａＩのスピーカの計算例を示す。An example of calculation for a speaker with a diameter of 16aI is shown below.
このスピーカの定数は下記（２）式である。The constant of this speaker is expressed by the following equation (2).
ドア内部のコンプライアンスＣ□はドア容積をＶ、とす
ると、
Ｃ
ＣＩＩｖ” ρ。ｃ Ｚ （ｇ ａ Ｚ ） ｔ
”’ ＋３１但し、ρ。は空気密度、Ｃは
音速である。Compliance C□ inside the door is given by the door volume V, C CIIv” ρ.
``' +31 However, ρ is the air density and C is the speed of sound.
付加質量ｍ、はダクト断面積をＳ、、ダクト長を！、と
すると、
′・ ・・・（４）
ｍｌ ・ρ・・（πａ′）′・−り一と表わされる。The additional mass m, is the duct cross-sectional area S, and the duct length! , it is expressed as ′・・・・(4) ml・ρ・・(πa′)′・−ri1.
上記（１）〜（４）式から、旦＝（土）′、ｑ−
８，２□ ｒｌ、 、 −（ｓｌとなる０乗
用車のフロントドア容積■。を約５４１、***振周波数
１．を５０Ｈｚと仮定すると、ダクト直径２〜２０口の
場合、ダクト長さを約０．６〜７０］の範囲内で選択す
れば良いことがわかる。From the above equations (1) to (4), tan = (Sat)', q- 8, 2□ rl, , -(sl) 0 The front door volume of the passenger car is approximately 541, and the anti-resonance frequency is 1. Assuming 50 Hz, if the duct diameter is 2 to 20 ports, it is understood that the duct length may be selected within the range of approximately 0.6 to 70 mm.
第５図はフロントドアの概略横断面を各々示し、第１実
施例と同し部分には同符号１〜３を付し、その重複説明
を避ける。自動車のドアでは、奥行が浅く、長いダクト
の設置が困難な場合がある。FIG. 5 each shows a schematic cross section of the front door, and the same parts as in the first embodiment are given the same reference numerals 1 to 3 to avoid redundant explanation. Automobile doors have a shallow depth, making it difficult to install long ducts.
この場合、第５図１８＋に示したように、必要な長さの
ダクトを曲げ、Ｌ字形に収納し易くするようにバスレフ
開孔３からスピーカ２側に向けてフロントドア１内部に
ダクト５ａを設けても、上記実施例と同様な効果を奏す
る。In this case, as shown in FIG. 5 18+, bend the duct to the required length and insert the duct 5a inside the front door 1 from the bass reflex opening 3 toward the speaker 2 side so that it can be easily stored in an L-shape. Even if it is provided, the same effects as in the above embodiment can be achieved.
第５図（ｂｌは、フロントドア１の内壁１ａをダクト５
ｂの内壁と共用させ、ダクｌ−５ｂをフロントドア１内
部でバスレフ開孔３からスピーカ２側に伸長させた例で
ある。Fig. 5 (bl shows the inner wall 1a of the front door 1
This is an example in which the duct 1-5b is shared with the inner wall of the front door 1 and extends from the bass reflex opening 3 toward the speaker 2 side inside the front door 1.
第３図（Ｃ）は真直ぐなダクト５ｃをフロントドア１の
外側に突出させて設けた例である。FIG. 3(C) shows an example in which a straight duct 5c is provided to protrude outside the front door 1.
第５図１８＋はＬ字形のダクト５ｄをフロントドア１の
外側でバスレフ開孔３からスピーカ２側に伸長させた例
である。FIG. 5 18+ shows an example in which an L-shaped duct 5d is extended from the bass reflex opening 3 toward the speaker 2 on the outside of the front door 1.
第５図１８＋は、フロントドア１の外壁１ｂをダクト５
ｅの内壁と共用させ、ダクト５ｅをダクト５ｄと同様に
して設けた例である。FIG. 5 18+ shows how the outer wall 1b of the front door 1 is connected to the duct 5.
This is an example in which the duct 5e is shared with the inner wall of the duct 5e and the duct 5d is provided in the same manner as the duct 5d.
第６図はフロントドアの概略横断面を示し、Ｕ字形のダ
クトを用いた例である。第６図において、Ｕ字形のダク
ト５ｆをバスレフ開孔３を中央にしてフロントドア１の
内外でスピーカ２側に伸長するように設け、しかもフロ
ントドア１の内壁１ａと外壁１ｂをダクト５ｆの内壁と
共用させるようにしたものである。このようにダクトを
変形させることにより、車室内のような狭い空間内でダ
クトを効率良く収納することができる。FIG. 6 shows a schematic cross section of the front door, and is an example using a U-shaped duct. In FIG. 6, a U-shaped duct 5f is provided with the bass reflex aperture 3 in the center and extends toward the speaker 2 inside and outside the front door 1, and the inner wall 1a and the outer wall 1b of the front door 1 are connected to the inner wall of the duct 5f. It was designed to be shared with By deforming the duct in this manner, the duct can be efficiently housed in a narrow space such as the interior of a vehicle.
なお、第５図及び第６図に示すようにダクトを設けても
第４図を参照して述べたと同様な効果を奏する。Note that even if a duct is provided as shown in FIGS. 5 and 6, the same effect as described with reference to FIG. 4 can be obtained.
以上のように、この発明によれば、自動車のドアの車室
側壁面に開孔、又はダクトを設け、ノくスレフ構造のス
ピーカキャビネットのように構成したので、車室内で十
分な重低音を再生できる効果がある。As described above, according to the present invention, an opening or a duct is provided on the side wall of the vehicle door and is configured like a speaker cabinet with a noxleaf structure, so that sufficient deep bass can be produced inside the vehicle interior. It has a regenerative effect.
第１図はこの発明の一実施例によるフロントドアの外観
を示す図、第２図は第１図の概略横断面図、第３図はバ
スレフ構造のスピーカシステムの等価回路をフロントド
アの概略横断面と共に示す図、第４図はバスレフ構造を
形成するダクト断面を示すフロントドアの概略横断面図
、第５図（ａｌ〜第５図（ｅｌ及び第６図はダクトの各
変形例を示すフロントドアの概略横断面図、第７図は従
来のフロントドアの外観を示す図である。
図中、１・・・フロントドア、２・・・スピーカ、３・
・・バスレフ開孔、
・・・ダクト。
なお、
図中同一符号は同一、
又は相当部分を示
す。FIG. 1 is a diagram showing the appearance of a front door according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of FIG. 1, and FIG. 4 is a schematic cross-sectional view of the front door showing the cross section of the duct forming the bass reflex structure, and FIG. A schematic cross-sectional view of the door, FIG. 7, is a diagram showing the appearance of a conventional front door.In the figure, 1...front door, 2...speaker, 3...
...bass reflex hole, ...duct. In addition, the same symbols in the figures indicate the same or equivalent parts.
Claims (1)
アの車室側壁面に開孔、又はダクトを設けて前記スピー
カの背面音を利用した位相反転形構造にしたことを特徴
とする車載スピーカシステム。An in-vehicle speaker characterized in that a speaker is attached to the wall surface of the vehicle door on the side of the vehicle interior, and an opening or a duct is provided in the wall surface of the vehicle interior of the door to create a phase inversion type structure that utilizes sound from the rear surface of the speaker. system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12768590A JPH0422296A (en) | 1990-05-16 | 1990-05-16 | On-vehicle speaker system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12768590A JPH0422296A (en) | 1990-05-16 | 1990-05-16 | On-vehicle speaker system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0422296A true JPH0422296A (en) | 1992-01-27 |
Family
ID=14966176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12768590A Pending JPH0422296A (en) | 1990-05-16 | 1990-05-16 | On-vehicle speaker system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0422296A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762263A1 (en) * | 1997-04-18 | 1998-10-23 | Rockwell Lvs | Loudspeaker sound enhancement chamber for motor vehicle |
| WO1999059840A1 (en) * | 1998-05-18 | 1999-11-25 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg | Vehicle door with a wall having a loudspeaker |
| KR20010066476A (en) * | 1999-12-31 | 2001-07-11 | 이계안 | reflex speaker system for automobile door |
| JP2001218289A (en) * | 1999-12-09 | 2001-08-10 | Bose Corp | Electroacoustic transduction for automobile pillar |
| JP2006281932A (en) * | 2005-03-31 | 2006-10-19 | Gp Daikyo Corp | Door structure of automobile |
| JP2007201600A (en) * | 2006-01-24 | 2007-08-09 | Matsushita Electric Works Ltd | Speaker unit |
| JP2009126202A (en) * | 2007-11-20 | 2009-06-11 | Nissan Motor Co Ltd | Door structure |
-
1990
- 1990-05-16 JP JP12768590A patent/JPH0422296A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762263A1 (en) * | 1997-04-18 | 1998-10-23 | Rockwell Lvs | Loudspeaker sound enhancement chamber for motor vehicle |
| US6226927B1 (en) | 1997-04-18 | 2001-05-08 | Meritor Light Vehicle Systems-France | Automobile vehicle door provided with a multicomponent module a part of which forms an acoustic cavity |
| WO1999059840A1 (en) * | 1998-05-18 | 1999-11-25 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg | Vehicle door with a wall having a loudspeaker |
| JP2001218289A (en) * | 1999-12-09 | 2001-08-10 | Bose Corp | Electroacoustic transduction for automobile pillar |
| KR20010066476A (en) * | 1999-12-31 | 2001-07-11 | 이계안 | reflex speaker system for automobile door |
| JP2006281932A (en) * | 2005-03-31 | 2006-10-19 | Gp Daikyo Corp | Door structure of automobile |
| JP2007201600A (en) * | 2006-01-24 | 2007-08-09 | Matsushita Electric Works Ltd | Speaker unit |
| JP2009126202A (en) * | 2007-11-20 | 2009-06-11 | Nissan Motor Co Ltd | Door structure |
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