JPH07131884A - Car audio system - Google Patents

Car audio system

Info

Publication number
JPH07131884A
JPH07131884A JP5301066A JP30106693A JPH07131884A JP H07131884 A JPH07131884 A JP H07131884A JP 5301066 A JP5301066 A JP 5301066A JP 30106693 A JP30106693 A JP 30106693A JP H07131884 A JPH07131884 A JP H07131884A
Authority
JP
Japan
Prior art keywords
low
frequency
speaker
pass filter
vehicle
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
Application number
JP5301066A
Other languages
Japanese (ja)
Inventor
Dairo Katayama
大朗 片山
Mitsuhiko Serikawa
光彦 芹川
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP5301066A priority Critical patent/JPH07131884A/en
Publication of JPH07131884A publication Critical patent/JPH07131884A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Exhaust Silencers (AREA)
  • Stereophonic Arrangements (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To flatten the frequency characteristic of reproduced sounds by eliminating low-band confined sounds due to resonance of the peculiar mode. CONSTITUTION:With respect to the acoustic signal of an acoustic signal reproducing device 102, middle-pitched and highpitched sounds are reproduced by speakers 109 and 111 attached in the front of a vehicle, and low-pitched sounds including the first-order natural-frequency of the cab are reproduced by speakers 113 and 115 attached in the center of the vehicle. When speakers 113 and 115 are attached in the node of the first-order natural frequency of a cab inside 14, low-pitched confined sounds are eliminated. Thus, the acoustic pressure frequency characteristic is made flat, and an uncomfortable feeling of listeners is reduced, and the articulation of reproduced sounds is improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、車両の搭乗者の頭部位
置で低周波数帯域の音圧周波数特性を平坦にし、低域こ
もり音を除去して受聴者の不快感を低減することができ
るカーオーディオシステムに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can flatten the sound pressure-frequency characteristic of the low frequency band at the head position of the occupant of the vehicle and remove the low range muffled sound to reduce the discomfort of the listener. It relates to a car audio system that can be used.

【0002】[0002]

【従来の技術】図4は、従来のカーオーディオシステム
の構成を示すブロック図である。本図において車両1に
音響信号再生装置2と各種のスピーカが取付けられる。
破線で示す音響信号再生装置2は、信号源3と第1の増
幅器4及び第2の増幅器5により構成され、チューナ,
CDプレーヤ,テーププレーヤ等の信号源3から出力さ
れる音響信号を増幅してスピーカ6〜9に出力する回路
である。
2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional car audio system. In the figure, an audio signal reproducing device 2 and various speakers are attached to a vehicle 1.
An acoustic signal reproducing device 2 shown by a broken line is composed of a signal source 3, a first amplifier 4 and a second amplifier 5, and includes a tuner,
It is a circuit that amplifies an audio signal output from a signal source 3 such as a CD player or a tape player and outputs the amplified audio signal to the speakers 6 to 9.

【0003】図4の左に示す車両1は車体の上部から見
た平面図である。第1のスピーカ6はダッシュボード1
0又はR側前部ドア11に取付けられている。又第2の
スピーカ7もダッシュボード10又はL側前部ドア12
に取付けられている。又第3のスピーカ8及び第4のス
ピーカ9はリアパネル13に取付けられている。増幅器
4はRチャンネルの音響信号を増幅してスピーカ6,8
を駆動する。同様に増幅器5はLチャンネルの音響信号
を増幅してスピーカ7,9を駆動する。
A vehicle 1 shown on the left of FIG. 4 is a plan view seen from the upper part of the vehicle body. The first speaker 6 is the dashboard 1
It is attached to the 0 or R side front door 11. The second speaker 7 is also the dashboard 10 or the L-side front door 12
Installed on. The third speaker 8 and the fourth speaker 9 are attached to the rear panel 13. The amplifier 4 amplifies the R channel acoustic signal to produce the speakers 6 and 8
To drive. Similarly, the amplifier 5 amplifies the L channel acoustic signal to drive the speakers 7 and 9.

【0004】[0004]

【発明が解決しようとする課題】このような構成のカー
オーディオシステムにおいて、車室内14で音響信号を
再生した場合、車室内14の固有周波数において共振現
象が起こる。この場合、運転席15又は助手席16又は
後部座席17の搭乗者頭部位置の音圧周波数特性にピー
クが生じ、低域こもり音が発生することがある。このよ
うな低域こもり音は受聴者を不快にさせ、更に再生音の
明瞭度を悪化させるという原因になっていた。
In the car audio system having such a structure, when an acoustic signal is reproduced in the passenger compartment 14, a resonance phenomenon occurs at the natural frequency of the passenger compartment 14. In this case, a peak may occur in the sound pressure frequency characteristic at the passenger's head position of the driver's seat 15, the passenger seat 16, or the rear seat 17, and a low-range muffled sound may be generated. Such low-range muffled sound has been a cause of making the listener uncomfortable and further deteriorating the clarity of the reproduced sound.

【0005】図5(a),(b)は夫々車両1内に生じ
る音の定在波を示す平面図及び側面図である。図5
(a)は車両1として排気量2000ccクラスの4ド
アセダン型の乗用車において、天井から見た車室内14
の第1次の固有モードを示す。図5(a)に示す破線A
は第1次の固有モードの節である。又、図5(b)は車
両1を横方向から見た第3次の固有モードを示し、破線
Bは第3次の固有モードの節である。このように第1次
の固有モードの節は運転席15及び助手席16と後部座
席17との間に生じやすい。特に第1次又は第3次の固
有モードによる音圧周波数特性のピークは、車室内14
の低域こもり音の原因となっていた。
FIGS. 5 (a) and 5 (b) are a plan view and a side view showing a standing wave of sound generated in the vehicle 1, respectively. Figure 5
(A) is a four-door sedan type passenger car with a displacement of 2000 cc as vehicle 1 and has a passenger compartment 14 viewed from the ceiling.
3 shows the first-order eigenmode of Dashed line A shown in FIG.
Is the first-order eigenmode section. Further, FIG. 5B shows a third-order eigenmode when the vehicle 1 is viewed from the lateral direction, and a broken line B is a node of the third-order eigenmode. As described above, the first eigenmode node is likely to occur between the driver seat 15 and the passenger seat 16 and the rear seat 17. In particular, the peak of the sound pressure frequency characteristic due to the first or third eigenmode is
It was the cause of muffled sound in the low range.

【0006】本発明はこのような従来の問題点に鑑みて
なされたものであって、搭乗者頭部位置における音圧周
波数特性を平坦にし、低域こもり音を除去して受聴者の
不快感を低減するカーオーディオシステムを実現するこ
とを目的とする。
The present invention has been made in view of the above conventional problems, and flattens the sound pressure frequency characteristic at the head position of the occupant and removes the low range muffled sound to make the listener uncomfortable. The purpose of the present invention is to realize a car audio system that reduces power consumption.

【0007】[0007]

【課題を解決するための手段】本願の請求項1の発明
は、信号源の音響信号の内、車室の第1次の固有周波数
を越える中音及び高音成分を濾波するハイパスフィルタ
と、信号源の音響信号の内、車室の第1次の固有周波数
を含む低音成分を濾波するローパスフィルタと、ハイパ
スフィルタの増幅信号が入力される中高音再生用のスピ
ーカと、ローパスフィルタの増幅信号が入力される低音
再生用のスピーカと、を具備し、車室内の定在波におけ
る第1次の固有モードの節となる位置に、低音再生用の
スピーカをを配置することを特徴とするものである。
According to a first aspect of the present invention, there is provided a high-pass filter for filtering mid-tone and high-tone components exceeding a first-order natural frequency of a vehicle interior among acoustic signals of a signal source, and a signal. Of the source acoustic signal, a low-pass filter that filters low-frequency components including the first-order natural frequency of the passenger compartment, a speaker for mid-to-high frequency reproduction to which the amplified signal of the high-pass filter is input, and an amplified signal of the low-pass filter are A speaker for low-frequency sound reproduction to be input, and the speaker for low-frequency sound reproduction is arranged at a position that becomes a node of the first-order eigenmode in the standing wave in the vehicle interior. is there.

【0008】本願の請求項2の発明は、信号源の音響信
号の内、車室の第3次の固有周波数を越える中音及び高
音成分を濾波するハイパスフィルタと、信号源の音響信
号の内、車室の第3次の固有周波数を含む低音成分を濾
波するローパスフィルタと、ハイパスフィルタの増幅信
号が入力される中高音再生用のスピーカと、ローパスフ
ィルタの増幅信号が入力される低音再生用のスピーカ
と、を具備し、車両の後部ドア内壁又は前部座席後方の
車室内側壁であって、車室内の定在波における第1次の
固有モードの節と第3次の固有モードの節とが交わる位
置に、低音再生用のスピーカを配置することを特徴とす
るものである。
According to a second aspect of the present invention, in the acoustic signal of the signal source, a high-pass filter for filtering middle and high frequency components exceeding the third natural frequency of the passenger compartment, and an acoustic signal of the signal source , A low-pass filter that filters low-frequency components including the third natural frequency of the passenger compartment, a speaker for mid-high range reproduction to which the amplified signal of the high-pass filter is input, and a low-frequency reproduction to which the amplified signal of the low-pass filter is input And a speaker in the vehicle interior side wall behind the front seat or the rear door, the first eigenmode section and the third eigenmode section in a standing wave in the vehicle compartment. It is characterized in that a speaker for low-pitched sound reproduction is arranged at a position where and intersect.

【0009】[0009]

【作用】このような特徴を有する本願の請求項1の発明
によれば、低域周波数で生じる車室の第1次の固有モー
ドの節となる位置に低音再生用のスピーカを設置する
と、車室内で元来生じた第1次の固有周波数での音の共
振が発生しなくなる。このため車両の搭乗者の頭部付近
での低域こもり音が解消され、音響信号再生装置からの
再生音の明瞭度を改善することができる。
According to the invention of claim 1 of the present application having such a feature, when a speaker for low-frequency sound reproduction is installed at a position which becomes a node of the first eigenmode of the vehicle interior generated at a low frequency, Resonance of sound at the primary natural frequency originally generated in the room does not occur. Therefore, the low-range muffled sound near the head of the passenger of the vehicle is eliminated, and the clarity of the reproduced sound from the acoustic signal reproducing device can be improved.

【0010】又本願の請求項2の発明によれば、車室の
第1次と第3次の固有モードの節となる位置に低音再生
用のスピーカを設置すると、車室内で元来生じた第1次
及び第3次の固有周波数での音の共振が発生しなくな
る。このため車両の搭乗者の頭部付近での低域こもり音
が解消され、音響信号再生装置からの再生音の明瞭度を
更に改善することができる。
According to the invention of claim 2 of the present application, when a speaker for low-pitched sound reproduction is installed at a position which becomes a node of the first and third eigenmodes in the vehicle compartment, it originally occurs in the vehicle compartment. Resonance of sound at the first and third natural frequencies does not occur. Therefore, the low-range muffled sound near the head of the passenger of the vehicle is eliminated, and the clarity of the reproduced sound from the acoustic signal reproducing device can be further improved.

【0011】[0011]

【実施例】本発明の第1実施例におけるカーオーディオ
システムについて図1を参照しながら説明する。図1は
第1実施例におけるカーオーディオシステムの構成を示
すブロック図である。従来例と同様に車両1には信号源
103を含む音響信号再生装置102と各種のスピーカ
が取付けられる。信号源103から出力されたRチャン
ネルの音響信号は第1のハイパスフィルタ(以下、HP
Fという)104と第1のローパスフィルタ(以下、L
PFという)105に出力される。又、信号源103か
ら出力されたLチャンネルの音響信号は第2のHPF1
06と第2のLPF107に出力される。HPF10
4,106は第1次の固有周波数を越える中音及び高音
領域の音響信号を通過させるフィルタであり、LPF1
05,107は第1次の固有周波数を含む低音領域の音
響信号を通過させるフィルタである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS A car audio system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the car audio system in the first embodiment. Similar to the conventional example, the vehicle 1 is equipped with the acoustic signal reproducing device 102 including the signal source 103 and various speakers. The R channel acoustic signal output from the signal source 103 is a first high pass filter (hereinafter referred to as HP).
F) 104 and a first low-pass filter (hereinafter L
(Hereinafter referred to as PF) 105. The L channel acoustic signal output from the signal source 103 is the second HPF1.
06 and the second LPF 107. HPF10
Reference numerals 4 and 106 denote filters that pass the acoustic signals in the mid-range and high-pitched frequencies that exceed the first-order natural frequency.
Reference numerals 05 and 107 are filters that pass an acoustic signal in a low-pitched sound region including a first-order natural frequency.

【0012】HPF104の出力は第1の増幅器108
で増幅され、第1のスピーカ109に与えられる。HP
F106の出力は第2の増幅器110で増幅され、第2
のスピーカ111に与えられる。又、LPF105の出
力は第3の増幅器112で増幅され、第3のスピーカ1
13に与えられる。LPF107の出力は第4の増幅器
114で増幅され、第4のスピーカ115に与えられ
る。スピーカ109,111は中高音用のスピーカであ
り、例えば車両1のダッシュボード10又は前部ドアの
壁面に取付けられる。
The output of the HPF 104 is the first amplifier 108.
Is amplified by and is given to the first speaker 109. HP
The output of F106 is amplified by the second amplifier 110 and
Of the speaker 111. The output of the LPF 105 is amplified by the third amplifier 112, and the third speaker 1
Given to 13. The output of the LPF 107 is amplified by the fourth amplifier 114 and given to the fourth speaker 115. The speakers 109 and 111 are speakers for medium and high frequencies, and are attached to, for example, the dashboard 10 of the vehicle 1 or the wall surface of the front door.

【0013】次にスピーカ113,115は低音用のス
ピーカであり、図1の破線部で示すように車室内14の
第1次の固有モードの節Aの部分に取付けられる。図3
に示すように第1次の固有モードの節Aは車両1の床面
と垂直に分布している。このためスピーカ113,11
5の実際の取付け場所は、運転席15及び助手席16の
背もたれ、床面、側壁又は天井等でよい。
Next, the speakers 113 and 115 are bass speakers and are attached to the section A of the primary eigenmode of the vehicle interior 14 as shown by the broken line in FIG. Figure 3
As shown in, the nodes A of the first eigenmode are distributed perpendicularly to the floor surface of the vehicle 1. Therefore, the speakers 113, 11
The actual mounting location of 5 may be the backrest of the driver's seat 15 and the passenger seat 16, the floor surface, the side wall or the ceiling.

【0014】このように構成されたカーオーディオシス
テムにおいて、信号源103から出力されたRチャンネ
ルの音響信号はHPF104,LPF105に与えら
れ、Lチャンネルの音響信号はHPF106,LPF1
07に与えられる。Rチャンネルの音響信号の中高音成
分は増幅器108で電力増幅され、スピース109より
音響が出力され、低音成分は増幅器112で電力増幅さ
れ、スピース113より音響が出力される。同様にLチ
ャンネルの音響信号の中高音成分は増幅器110で電力
増幅され、スピーカ111より音響が出力され、低音成
分は増幅器114で電力増幅され、スピーカ115より
音響が出力される。
In the car audio system configured as above, the R channel acoustic signal output from the signal source 103 is given to the HPF 104 and LPF 105, and the L channel acoustic signal is supplied to the HPF 106 and LPF1.
It is given to 07. The mid-high frequency component of the R channel acoustic signal is power-amplified by the amplifier 108, the sound is output from the spice 109, and the low-tone component is power-amplified by the amplifier 112, and the sound is output from the splice 113. Similarly, the middle and high frequency components of the L channel acoustic signal are power-amplified by the amplifier 110, the sound is output from the speaker 111, the low-frequency components are power-amplified by the amplifier 114, and the sound is output from the speaker 115.

【0015】2000ccクラスの4ドアセダン型の乗
用車の場合、車室内14の第1次の固有モードにおける
周波数は80Hz付近となる。図1に示す例では第1次
の固有モードの節Aとなる運転席15及び助手席16の
下部後方に低域再生用のスピーカ113及び115が車
室内側へ向けて取付けられており、これらのスピーカは
LPF105,106の遮断周波数以下の帯域を再生す
る。又前部ドアに配置されている中高域再生用のスピー
カ109,111はHPF104,107の遮断周波数
よりも高い帯域の音響を再生する。
In the case of a 2000 cc class four-door sedan type passenger car, the frequency in the first natural mode of the passenger compartment 14 is around 80 Hz. In the example shown in FIG. 1, speakers 113 and 115 for low-frequency reproduction are attached to the inside of the passenger compartment at the lower rear of the driver's seat 15 and the passenger's seat 16 which are nodes A of the primary eigenmode. The speaker reproduces the band below the cutoff frequency of the LPFs 105 and 106. Further, the speakers 109 and 111 for reproducing the middle and high frequencies arranged on the front door reproduce sound in a band higher than the cutoff frequencies of the HPFs 104 and 107.

【0016】図5に示す音響空間において、第1次の固
有モードの節の部分に音源を設置すると、この周波数成
分の共振がなくなることが数値解析(計算機シミュレー
ション)によって認められている。こうするとこのよう
な定在波がなくなり、搭乗者頭部位置での低域こもり音
は解消される。
In the acoustic space shown in FIG. 5, it has been confirmed by numerical analysis (computer simulation) that the resonance of this frequency component disappears when a sound source is installed at the node of the first-order eigenmode. By doing so, such standing waves are eliminated, and the low-range muffled sound at the passenger's head position is eliminated.

【0017】尚、低域再生用のスピーカ113,115
の設置場所は運転席15及び助手席16の背もたれに限
られるのではなく、車室内14の側壁において、第1次
の固有モードの節Aにあたる場所であればどこでもよ
い。
It should be noted that the speakers 113 and 115 for low frequency reproduction are provided.
The installation location of is not limited to the backrests of the driver's seat 15 and the passenger's seat 16, and may be any location on the side wall of the vehicle compartment 14 as long as it corresponds to the node A of the first eigenmode.

【0018】本発明の第2実施例におけるカーオーディ
オシステムについて図2を参照しながら説明する。図2
は第2実施例におけるカーオーディオシステムの構成を
示すブロック図であり、第1実施例と異なる部分は、低
音再生用のスピーカ113a,115aが夫々R側車室
内側壁18,L側車室内側壁19に取付けられているこ
とである。その他の部分は第1実施例と同一構成である
ので、同一符号を付けてそれらの説明は省略する。尚H
PF104,106は第3次の固有周波数を越える高域
の音響信号を通過させ、LPF105,107は第3次
の固有周波数を含む低域の音響信号を通過させるフィル
タである。
A car audio system according to the second embodiment of the present invention will be described with reference to FIG. Figure 2
FIG. 6 is a block diagram showing the configuration of a car audio system in a second embodiment. The parts different from the first embodiment are that speakers 113a and 115a for low-pitched sound reproduction are R side vehicle interior side wall 18 and L side vehicle interior side wall 19 respectively. It is installed in. The other parts have the same configuration as in the first embodiment, and therefore, the same reference numerals are given and their description is omitted. H
The PFs 104 and 106 are filters that pass high-frequency acoustic signals that exceed the third-order natural frequency, and the LPFs 105 and 107 are filters that pass low-frequency acoustic signals that include the third-order natural frequency.

【0019】図5(b)に示す車室内14の第3次の固
有モードは、2000ccクラスの4ドアセダン型の乗
用車の場合、その固有周波数が130Hz付近となる。
ここでR側車室内側壁18において、図3に示す第1次
の固有モードの節Aと第3次の固有モードの節Bとが交
わる位置に低域再生用スピーカ113aを配置する。同
様にしてL側車室内側壁19において、図3に示す第1
次の固有モードの節Aと第3次の固有モードの節Bとが
交わる位置Pに、低域再生用スピーカ115aを配置す
る。そしてこれらのスピーカ113a,115aでLP
F105,107の遮断周波数以下の音声帯域を再生す
る。中高音再生用のスピーカ109と111はHPF1
04,106の遮断周波数よりも高い周波数帯域の音響
を出力するものとする。
The third eigenmode of the passenger compartment 14 shown in FIG. 5B has a natural frequency of around 130 Hz in the case of a 2000 cc 4-door sedan type passenger vehicle.
Here, on the R-side vehicle interior side wall 18, the low-frequency reproduction speaker 113a is arranged at a position where the node A of the first eigenmode and the node B of the third eigenmode shown in FIG. 3 intersect. Similarly, on the L-side vehicle interior side wall 19, the first side shown in FIG.
The low frequency reproduction speaker 115a is arranged at a position P where the node A of the next eigenmode and the node B of the third eigenmode intersect. Then, with these speakers 113a and 115a, the LP
The audio band below the cutoff frequency of F105 and 107 is reproduced. Speakers 109 and 111 for middle and high range reproduction are HPF1
Sounds in a frequency band higher than the cutoff frequencies of 04 and 106 are output.

【0020】スピーカ113a、115aの再生周波数
帯域の調整は、LPF105,107で夫々行い、中高
音再生用のスピーカ109、111の再生周波数帯域の
調整は、HPF104,106で夫々行う。これによ
り、車室内14の第1次及び第3次の固有モードが励起
されることなく音響信号が再生され、車室内14の低域
こもり音が大幅に改善される。
The LPFs 105 and 107 adjust the reproduction frequency bands of the speakers 113a and 115a, respectively, and the HPFs 104 and 106 adjust the reproduction frequency bands of the speakers 109 and 111 for reproducing mid-high frequencies. As a result, the acoustic signal is reproduced without exciting the first and third eigenmodes in the vehicle interior 14, and the low-range muffled sound in the vehicle interior 14 is significantly improved.

【0021】[0021]

【発明の効果】以上のように本発明によれば、車室内の
定在波における固有モードの節となる位置に低音再生用
のスピーカを取り付けることにより、車両搭乗者の頭部
位置での低周波数帯域の音圧特性を平坦にすることがで
きる。このためカーオーディオシステムにおいて、車室
内空間の低域こもり音を除去し、受聴者の不快感を低減
することができる。
As described above, according to the present invention, a speaker for low-pitched sound reproduction is attached to a position which becomes a node of an eigenmode in a standing wave in a vehicle interior, so that the low-frequency sound at a head position of a vehicle occupant is reduced. The sound pressure characteristics in the frequency band can be flattened. Therefore, in the car audio system, it is possible to remove the low-range muffled sound in the vehicle interior space and reduce the discomfort of the listener.

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

【図1】本発明の第1実施例におけるカーオーディオシ
ステムの構成を示すブロック図である。
FIG. 1 is a block diagram showing a configuration of a car audio system according to a first embodiment of the invention.

【図2】本発明の第2の実施例におけるカーオーディオ
システムの構成を示すブロック図である。
FIG. 2 is a block diagram showing a configuration of a car audio system according to a second embodiment of the present invention.

【図3】車室内の第1次の固有モードの節、及び第3次
の固有モードの節、及びそれらの交点を表した図であ
る。
FIG. 3 is a diagram showing a first-order eigenmode node, a third-order eigenmode node, and their intersections in a vehicle interior.

【図4】従来のカーオーディオシステムの構成例を示す
ブロック図である。
FIG. 4 is a block diagram showing a configuration example of a conventional car audio system.

【図5】(a)は車室内の第1次の固有モードを表した
平面図であり、(b)は車室内の第3次の固有モードを
表した側面図である。
FIG. 5A is a plan view showing a first-order eigenmode in the vehicle interior, and FIG. 5B is a side view showing a third-order eigenmode in the vehicle interior.

【符号の説明】[Explanation of symbols]

1 車両 10 ダッシュボード 11 R側前部ドア 12 L側前部ドア 13 リアパネル 14 車室内空間 15 運転席 16 助手席 17 後部座席 18 R側車室内側壁 19 L側車室内側壁 102 音響信号再生装置 103 信号源 104,106 HPF 105,107 LPF 108,110,112,114 増幅器 109,111,113,115,113a,115a
スピーカ A 第1次の固有モードの節 B 第3次の固有モードの節
1 Vehicle 10 Dashboard 11 R Side Front Door 12 L Side Front Door 13 Rear Panel 14 Vehicle Interior Space 15 Driver's Seat 16 Passenger Seat 17 Rear Seat 18 R Side Vehicle Interior Side Wall 19 L Side Vehicle Interior Side Wall 102 Acoustic Signal Playback Device 103 Signal source 104,106 HPF 105,107 LPF 108,110,112,114 Amplifier 109,111,113,115,113a, 115a
Speaker A First-order eigenmode section B Third-order eigenmode section

フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04R 1/28 310 D 5/02 F Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display area H04R 1/28 310 D 5/02 F

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 信号源の音響信号の内、車室の第1次の
固有周波数を越える中音及び高音成分を濾波するハイパ
スフィルタと、 前記信号源の音響信号の内、車室の第1次の固有周波数
を含む低音成分を濾波するローパスフィルタと、 前記ハイパスフィルタの増幅信号が入力される中高音再
生用のスピーカと、 前記ローパスフィルタの増幅信号が入力される低音再生
用のスピーカと、を具備し、 車室内の定在波における第1次の固有モードの節となる
位置に、前記低音再生用のスピーカをを配置することを
特徴とするカーオーディオシステム。
1. A high-pass filter for filtering mid-tone and high-pitched sound components exceeding a first-order natural frequency of a vehicle interior among the acoustic signals of the signal source; and a first of the vehicle interior of the acoustic signals of the signal source. A low-pass filter that filters low-frequency components including the following natural frequencies, a speaker for middle and high-pitched sound reproduction to which the amplified signal of the high-pass filter is input, and a speaker for low-tone reproduction to which the amplified signal of the low-pass filter is input, A car audio system comprising: a speaker for low-pitched sound reproduction, which is arranged at a position that becomes a node of a first-order eigenmode of a standing wave in a vehicle interior.
【請求項2】 信号源の音響信号の内、車室の第3次の
固有周波数を越える中音及び高音成分を濾波するハイパ
スフィルタと、 前記信号源の音響信号の内、車室の第3次の固有周波数
を含む低音成分を濾波するローパスフィルタと、 前記ハイパスフィルタの増幅信号が入力される中高音再
生用のスピーカと、 前記ローパスフィルタの増幅信号が入力される低音再生
用のスピーカと、を具備し、 車両の後部ドア内壁又は前部座席後方の車室内側壁であ
って、車室内の定在波における第1次の固有モードの節
と第3次の固有モードの節とが交わる位置に、前記低音
再生用のスピーカを配置することを特徴とするカーオー
ディオシステム。
2. A high-pass filter for filtering mid-tone and high-pitched sound components exceeding a third-order natural frequency of a vehicle interior among the acoustic signals of the signal source; and a third of the vehicle interior of the acoustic signals of the signal source. A low-pass filter that filters low-frequency components including the following natural frequencies, a speaker for middle and high-pitched sound reproduction to which the amplified signal of the high-pass filter is input, and a speaker for low-tone reproduction to which the amplified signal of the low-pass filter is input, A position on the inner wall of the rear door of the vehicle or on the inner side wall of the vehicle behind the front seat where the node of the first-order eigenmode and the node of the third-order eigenmode of the standing wave in the vehicle interior intersect In the car audio system, the speaker for low-frequency sound reproduction is arranged.
JP5301066A 1993-11-04 1993-11-04 Car audio system Pending JPH07131884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5301066A JPH07131884A (en) 1993-11-04 1993-11-04 Car audio system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5301066A JPH07131884A (en) 1993-11-04 1993-11-04 Car audio system

Publications (1)

Publication Number Publication Date
JPH07131884A true JPH07131884A (en) 1995-05-19

Family

ID=17892460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5301066A Pending JPH07131884A (en) 1993-11-04 1993-11-04 Car audio system

Country Status (1)

Country Link
JP (1) JPH07131884A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766953A1 (en) * 1997-07-29 1999-02-05 Renault Acoustic control system
WO2007139065A1 (en) 2006-05-31 2007-12-06 Panasonic Corporation Audio playback system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766953A1 (en) * 1997-07-29 1999-02-05 Renault Acoustic control system
WO2007139065A1 (en) 2006-05-31 2007-12-06 Panasonic Corporation Audio playback system
US8068617B2 (en) 2006-05-31 2011-11-29 Panasonic Corporation Audio playback system

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