JP2934673B2 - In-vehicle 4-channel stereo playback device - Google Patents

In-vehicle 4-channel stereo playback device

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Publication number
JP2934673B2
JP2934673B2 JP1329988A JP32998889A JP2934673B2 JP 2934673 B2 JP2934673 B2 JP 2934673B2 JP 1329988 A JP1329988 A JP 1329988A JP 32998889 A JP32998889 A JP 32998889A JP 2934673 B2 JP2934673 B2 JP 2934673B2
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Japan
Prior art keywords
phase
channel
channels
corrected
phase difference
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JP1329988A
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Japanese (ja)
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JPH0372800A (en
Inventor
弘一 定家
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Onkyo Corp
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Onkyo Corp
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Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、車室内のフロント部の左右両端並びにリ
ヤ部の左右両端に配置されているスピーカに対して、例
えば運転席若しくは助手席のごとく偏った位置で聴取し
ても、どちらの聴取位置に対しても、自然な音像定位を
得ることができる車載用４チャンネルステレオ再生装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a speaker disposed at both left and right ends of a front portion and a rear portion of a rear portion in a vehicle cabin, for example, as a driver's seat or a passenger seat. The present invention relates to an in-vehicle 4-channel stereo reproducing apparatus capable of obtaining a natural sound image localization at any listening position even when listening at a biased position.

［従来の技術］ 従来、一般的な車載用４チャンネルステレオ再生装置
の構成は、周知の如く前部座席のフロントの両端に右チ
ャンネルスピーカと左チャンネルスピーカとを配置し、
車室内のリヤの両端に同じく右チャンネルスピーカと左
チャンネルスピーカとを配置し、これ等４箇所のスピー
カは夫々独立した各チャンネル信号によって駆動する如
くに構成されている。[Prior Art] Conventionally, a configuration of a general in-vehicle four-channel stereo reproducing apparatus includes a right-channel speaker and a left-channel speaker arranged at both ends of a front of a front seat, as is well known.
Similarly, a right channel speaker and a left channel speaker are arranged at both ends of the rear in the vehicle compartment, and these four speakers are configured to be driven by independent channel signals.

［解決しようとする課題］ この様な構造を有する従来の車載用ステレオ再生装置
は、通常聴取者がスピーカ配置に対し偏った位置で聴取
するため、左右各スピーカから聴取位置まで音波の到達
時間差及びレベル差が生じ、低中域の広い範囲に亘って
両耳間が逆位相に近い状態にあるため、音像位置が聴取
位置に近い方のスピーカ位置に偏り、逆相感の大きい不
自然な音像定位となるという問題点があった。[Problem to be Solved] The conventional on-vehicle stereo reproducing apparatus having such a structure usually listens at a position deviated from the speaker arrangement, so that the difference in the arrival time difference of the sound wave from the left and right speakers to the listening position and Since a level difference occurs and the interaural state is close to the opposite phase over a wide range of the low-mid range, the sound image position is biased toward the speaker position closer to the listening position, resulting in an unnatural sound image with a large sense of reverse phase. There was a problem of being localized.

又、フロントスピーカとリヤスピーカとの間の位相差
も前後の定位感に大きく影響し、聴取位置に近い方のフ
ロントスピーカ（例えばフロント左スピーカ）とその対
角方向のリヤスピーカ（リヤ右スピーカ）との干渉によ
って、再生された音像が後方に引寄せられた様に感じ
る。Also, the phase difference between the front speaker and the rear speaker greatly affects the sense of localization before and after, and the front speaker (eg, front left speaker) closer to the listening position and the rear speaker (rear right speaker) in the diagonal direction thereof. It feels as if the reproduced sound image has been pulled backward by the interference with.

これに対し、片一方のチャンネルのみの振幅や時間差
を補正して逆相感を解消する手段が実用化されている
が、この手段では、例えば運転席での逆相感を解消する
ように補正すれば、反対側の助手席では尚一層音質劣化
が激しくなるという欠点があった。On the other hand, a means for correcting the amplitude and time difference of only one of the channels to eliminate the feeling of opposite phase has been put to practical use, but this means, for example, corrects to eliminate the feeling of opposite phase in the driver's seat. If this is the case, there is a drawback that the sound quality is further severely deteriorated in the passenger seat on the opposite side.

そこで発明者は、左右スピーカ対の夫々の再生音の聴
取位置での位相差が、フロントとリヤとでは大略等し
く、又、フロントとリヤ間では車室内の状態によってフ
ロントの左右合成音と、リヤの左右の合成音との間に聴
取位置での位相差が見られることを実験によって見出だ
し、この事実に基づき本発明では、聴取位置が偏ってい
るために生じる左右両チャンネル間の受聴位置に於ける
位相差を、夫々のチャンネルで分担して補正すると共
に、フロントとリヤ間の位相差についても、当該位相差
の逆特性フイルタを挿入して位相の追加補正をすること
により、上記従来例の有する問題点や欠点を解決するこ
とを目的とする。Therefore, the inventor of the present application has proposed that the phase difference at the listening position of each of the left and right speakers at the listening position is substantially equal between the front and rear, and between the front and rear, the front left and right synthesized sound and the rear It has been found by experiment that a phase difference at the listening position is seen between the left and right synthesized sounds of the left and right synthesized sounds.Based on this fact, in the present invention, the listening position between the left and right channels caused by the uneven listening position is determined. The phase difference between the front and rear is corrected by sharing the phase difference between the respective channels, and the phase difference between the front and rear is additionally corrected by inserting a filter having an inverse characteristic of the phase difference. It is an object of the present invention to solve the problems and disadvantages of the present invention.

［課題を解決するための手段］ 上記目的を達成するための本発明に係る車載用４チャ
ンネルステレオ再生装置を、第１実施例の構成を示す第
１図によって説明すると、フロントの左右各チャンネル
並びにリヤの左右各チャンネルに夫々位相補正用デジタ
ルフィルタが接続されており、フロントの左右両チャン
ネルが正相駆動された場合の左チャンネルスピーカ4FL
の再生音と右チャンネルスピーカ4FRの再生音との、聴
取位置に於ける位相差をPh（ｆ）Ｆとすると、左右いず
れか一方のチャンネルの位相特性が＋Ph（ｆ）F/2だけ
補正されるとともに、他方のチャンネルの位相特性が−
Ph（ｆ）F/2だけ補正されており、リヤの左右両チャン
ネルが正相駆動された場合の左チャンネルスピーカ4RL
の再生音と右チャンネルスピーカ4RRの再生音との、聴
取位置に於ける位相差をPh（ｆ）Ｒとすると、左右いず
れか一方のチャンネルの位相特性が＋Ph（ｆ）R/2だけ
補正されるとともに、他方のチャンネルの位相特性が−
Ph（ｆ）R/2だけ補正されていることを特徴とする車載
用４チャンネルステレオ再生装置であり、又、第２実施
例としてフロントの左右各チャンネル並びにリヤの左右
各チャンネルに位相補正用のデジタルフイルタが夫々接
続されており、フロント並びにリヤの夫々の左右スピー
カ対に於いて左右いずれか一方のチャンネルの出力信号
の位相が入力信号に対して60度〜90度進められると共
に、他方のチャンネルの出力信号の位相が入力信号に対
して60度〜90度遅延されて、左右両チャンネルの各出力
信号間の位相差が120度〜180度に設定されていることを
特徴とする車載用ステレオ再生装置であり、更に上記各
実施例において、補正後のフロントの左右の合成音の前
記補正後のリヤの左右の合成音との位相差をPh（ｆ）FR
とすると、リヤの左右各チャンネルがPh（ｆ）FRの逆特
性相当量即ち−Ph（ｆ）FRだけ追加補正されていること
を特徴とする車載用４チャンネルステレオ再生装置であ
る。[Means for Solving the Problems] A vehicle-mounted 4-channel stereo reproducing apparatus according to the present invention for achieving the above object will be described with reference to FIG. 1 showing the configuration of a first embodiment. A digital filter for phase correction is connected to each of the left and right channels on the rear, and the left channel speaker 4FL when both the left and right channels on the front are driven in positive phase
If the phase difference at the listening position between the reproduced sound of the right channel speaker 4FR and the reproduced sound of the right channel speaker is Ph (f) F, the phase characteristic of one of the left and right channels is corrected by + Ph (f) F / 2. And the phase characteristic of the other channel is-
Left channel speaker 4RL corrected by Ph (f) F / 2, when both left and right rear channels are driven in normal phase
Assuming that the phase difference at the listening position between the reproduction sound of the right channel speaker 4RR and the reproduction sound of the right channel speaker 4RR is Ph (f) R, the phase characteristic of one of the left and right channels is corrected by + Ph (f) R / 2. And the phase characteristic of the other channel is-
A four-channel in-car stereo reproducing apparatus characterized in that the phase is corrected by Ph (f) R / 2. As a second embodiment, each of the left and right front channels and the left and right rear channels is used for phase correction. A digital filter is connected to each of the front and rear left and right speaker pairs so that the phase of the output signal of one of the left and right channels is advanced by 60 to 90 degrees with respect to the input signal, and the other channel is Wherein the phase of the output signal is delayed by 60 to 90 degrees with respect to the input signal, and the phase difference between the output signals of the left and right channels is set to 120 to 180 degrees. In each of the above embodiments, the phase difference between the corrected left and right synthesized sounds of the front left and right synthesized sounds and the corrected rear right and left synthesized sounds is Ph (f) FR.
Then, the rear left and right channels are additionally corrected by an amount equivalent to the inverse characteristic of Ph (f) FR, that is, -Ph (f) FR.

第２図に上記実施例のフロントチャンネルを例とし
て、左右のデジタルフィルタ2FLと2FRの振幅と位相関係
を模式的に示す。同図（ａ），（ｂ）は振幅特性で、
（ｃ）はデシタルフィルタ2FLの位相特性、（ｄ）はデ
シタルフィルタ2FRの位相特性（群遅延を補正したも
の）であって、左右の位相差が大きいf1とf2との間の周
波数帯域において、左チャンネルのデジタルフィルタ2F
Lが＋Ph（ｆ）F/2だけ位相が進められていることを示
す。FIG. 2 schematically shows the relationship between the amplitude and the phase of the left and right digital filters 2FL and 2FR using the front channel of the above embodiment as an example. FIGS. 7A and 7B show amplitude characteristics.
(C) is the phase characteristic of the digital filter 2FL, (d) is the phase characteristic of the digital filter 2FR (group delay corrected), and in the frequency band between f1 and f2 where the left and right phase difference is large, Digital filter 2F for left channel
L indicates that the phase is advanced by + Ph (f) F / 2.

［作 用］ そして、此の様な構成の車載用４チャンネルステレオ
再生装置では、運転席（右座席）5Rに於いては、第１実
施例では例えばフロントの左チャンネルスピーカ4FLか
ら出た再生音は＋Ph（ｆ）F/2だけ位相が進むように補
正され、右チャンネルスピーカ4FRから出た再生音はPh
（ｆ）F/2、位相が遅れるように補正されているので、
本来同位相で駆動された場合に偏った聴取位置5R、即ち
運転席に於ける再生音がPh（ｆ）Ｆだけ位相差を生じて
事実上相互に逆位相に近い状態となっていたのに対し、
本実施例では左右の再生音相互の位相差が、スピーカ直
前において＋Ph（ｆ）F/2と−Ph（ｆ）F/2との差、即ち
Ph（ｆ）となって、各チャンネルの再生音が運転席5Rに
到達した時は、本来生じるべき相互の位相差がキャンセ
ルされて同位相となり、従来例に於て感じられた逆相感
による音質劣化が生じることは無い。[Operation] In the in-vehicle 4-channel stereo reproducing apparatus having such a configuration, in the driver's seat (right seat) 5R, in the first embodiment, for example, the reproduced sound output from the front left channel speaker 4FL is output. Is corrected so that the phase advances by + Ph (f) F / 2, and the reproduced sound from the right channel speaker 4FR is Ph
(F) Since F / 2 is corrected so that the phase is delayed,
Although the listening position 5R which is originally biased when driven in the same phase, that is, the reproduced sound in the driver's seat has a phase difference of Ph (f) F, and is in a state of being substantially mutually opposite in phase. On the other hand,
In this embodiment, the phase difference between the left and right reproduced sounds is the difference between + Ph (f) F / 2 and -Ph (f) F / 2 immediately before the speaker, ie,
When the playback sound of each channel reaches Ph.sub. (F) and reaches the driver's seat 5R, the phase difference that should have occurred is canceled and becomes the same phase. There is no degradation of sound quality.

リヤの左チャンネルスピーカ4RLの再生音と右チャン
ネルスピーカ4RRの再生音との位相関係も上記フロント
の場合とほぼ同様で、運転席5Rに於ける左右各チャンネ
ル出力音の位相差は、 ［＋Ph（ｆ）R/2］−［−Ph（ｆ）R/2］＝Ph（ｆ）Ｒ となって、従来例に於て感じられた逆相感による音質劣
化が生じることは無い。The phase relationship between the reproduced sound of the rear left channel speaker 4RL and the reproduced sound of the right channel speaker 4RR is almost the same as in the front case, and the phase difference between the left and right channel output sounds at the driver's seat 5R is [+ Ph ( f) R / 2]-[-Ph (f) R / 2] = Ph (f) R, and there is no deterioration in sound quality due to the sense of reversed phase felt in the conventional example.

また、上記した再生音の、音源から聴取位置までの位
相推移の関係は、距離的に運転席5Rと対称の位置にある
助手席5Lに対しても同一の関係にあり、位相は巡回性で
あるから当該助手席5Lに於ても各チャンネルの再生音は
同位相となって運転席5Rと同様に逆相感による音質劣化
は生じない。Further, the relationship of the phase transition from the sound source to the listening position of the reproduced sound is the same as that of the passenger seat 5L located symmetrically with respect to the driver's seat 5R, and the phase is cyclic. Therefore, even in the passenger seat 5L, the reproduced sound of each channel has the same phase, and the sound quality is not deteriorated due to the sense of opposite phase as in the driver seat 5R.

次に、上記第１実施例が聴取位置における左右の位相
差Ph（ｆ）を実測し、該実施例を基にして夫々のチャン
ネルの位相補正を行うのに対し、第２実施例ではスピー
カ設置位置、聴取位置等について予め最も一般的と思わ
れる再生音場条件を設定し、これに基づき左右両チャン
ネルの位相補正を行う方式であって、第１実施例のよう
に聴取の都度左右両チャンネル間の位相差を検出し、再
生音場条件に基くインパルスレスポンスを計算する必要
がないので、非常に手軽にすべての車両に設置でき、逆
相感を排除して音質劣化のない定位の優れた再生音を得
ることが出来る。なお、第１、第２実施例ともこれら＋
Ph（ｆ）/2,−Ph（ｆ）/2の位相補正を施した信号につ
いては、＋90゜〜−90゜の範囲内の位相変化であるから
原信号に対して全く遜色ない再生音であり、両者の区別
は殆どつかない。Next, the first embodiment actually measures the left and right phase difference Ph (f) at the listening position and corrects the phase of each channel based on the actual embodiment. In this system, the most common reproduction sound field conditions are set in advance for the position, the listening position, and the like, and the phase of both the left and right channels is corrected based on the conditions. Because it is not necessary to detect the phase difference between the two and calculate the impulse response based on the reproduced sound field conditions, it can be installed very easily in all vehicles, eliminates the feeling of reversed phase, and has excellent localization without sound quality deterioration. A reproduction sound can be obtained. In both the first and second embodiments, these +
The phase-corrected signal of Ph (f) / 2, -Ph (f) / 2 has a phase change within the range of + 90 ° to -90 °, so that the reproduced sound is completely inferior to the original signal. There is little distinction between them.

又、フロントとリヤ間でPh（ｆ）FRなる位相差が生じ
て、例えば音像が後方に引き寄せられたように感じる場
合に、Ph（ｆ）FRの逆特性でリヤチャンネルに対して追
加の位相補正を施すことによって、このような不自然な
音象定位を解消することができる。Also, when a phase difference of Ph (f) FR occurs between the front and the rear, for example, when the sound image is felt to be pulled rearward, an additional phase is added to the rear channel by the inverse characteristic of the Ph (f) FR. By performing the correction, such unnatural sound image localization can be eliminated.

第４図並びに第５図に、従来の通常の再生を行った場
合の、運転席5Rに於ける前右チャンネルスピーカ4FRと
前左チャンネルスピーカ4FLの再生音の位相差、並びに
後右チャンネルスピーカ4RRと後左チャンネルスピーカ4
RLの再生音の位相差を夫々点線で示す。また第６図に同
じ運転席5Rに於ける前左チャンネルスピーカ4FLから出
た再生音と後右チャンネルスピーカ4RRから出た再生音
の位相差を、更に第７図に前右チャンネルスピーカ4FR
から出た再生音と後左チャンネルスピーカ4RLから出た
再生音の位相差を同じく夫々点線で示す。4 and 5 show the phase difference between the reproduced sounds of the front right channel speaker 4FR and the front left channel speaker 4FL at the driver's seat 5R and the rear right channel speaker 4RR in the case of performing the conventional normal reproduction. And rear left channel speaker 4
The phase differences between the RL reproduced sounds are indicated by dotted lines. FIG. 6 shows the phase difference between the reproduced sound from the front left channel speaker 4FL and the reproduced sound from the rear right channel speaker 4RR in the same driver's seat 5R, and FIG. 7 shows the front right channel speaker 4FR.
The phase difference between the reproduced sound from the speaker and the reproduced sound from the rear left channel speaker 4RL is also indicated by dotted lines.

これ等の位相特性測定結果で分かるように、一般に現
実の車内音場の場合、100Hz〜2KHz帯域では右側のスピ
ーカから出た再生音と左側スピーカから出た再生音との
位相差は、ほとんど120゜〜180゜となっており、しかも
フロントのスピーカ群とリヤのスピーカ群とでは、聴取
位置での左右の再生音の位相関係がほぼ類似しているの
で、これ等の位相差と近似的な位相角の補正を、左右各
スピーカの入力信号の段階で施すことによって、運転席
5R並びにの助手席5L両聴取位置に於いて、従来に於て感
じられた逆相感が改善され、音質劣化が生じることは無
い。As can be seen from these phase characteristics measurement results, in the case of an actual in-car sound field, the phase difference between the reproduced sound output from the right speaker and the reproduced sound output from the left speaker is almost 120 Hz in the 100 Hz to 2 KHz band.゜ ~ 180 ゜, and the front speaker group and the rear speaker group have almost the same phase relationship between the left and right reproduced sounds at the listening position. By correcting the phase angle at the stage of the input signals of the left and right speakers, the driver's seat
At the listening position of both the 5R and the passenger seat 5L, the sense of inversion that was conventionally felt is improved, and the sound quality does not deteriorate.

また、此の事実からフロントとリヤ間の位相さ補正に
ついては、夫々の左右チャンネルの合成音について聴取
位置での位相差の追加補正をすればよい。From this fact, the phase difference between the front and the rear may be corrected by additionally correcting the phase difference at the listening position with respect to the synthesized sound of each of the left and right channels.

参考までに、第８図並びに第９図に上記運転席5Rとは
対称の位置にある助手席5Lに於ける前右チャンネルスピ
ーカ4FRと前左チャンネルスピーカ4FLの再生音の位相
差、並びに後右チャンネルスピーカ4RRと後左チャンネ
ルスピーカ4RLの再生音の位相差を夫々点線で示す。助
手席5Lに於いても、右と左の各スピーカからの再生音相
互の位相関係は、上記運転席5Rの場合とほぼ同じ傾向を
示しているので、前述の作用に基づき再生音の逆位相関
係による音質劣化は相当に改善されることになる。For reference, FIGS. 8 and 9 show the phase difference between the reproduced sound of the front right channel speaker 4FR and the front left channel speaker 4FL in the passenger seat 5L, which is symmetrical to the driver's seat 5R, and the rear right. The dotted lines indicate the phase differences between the reproduced sounds of the channel speaker 4RR and the rear left channel speaker 4RL. In the passenger seat 5L, the phase relationship between the reproduced sounds from the right and left speakers shows almost the same tendency as in the case of the driver's seat 5R. The sound quality deterioration due to the relationship is considerably improved.

更に、回路中に振幅周波数特性も補正したインパルス
レスポンス応答を計算し、与えることによって再生音の
周波数特性を、例えば低域を５乃至10デシベル増強する
ことで、車両の走行雑音による低域マスキングに対応せ
しめたり、フレッチャーマンソンの等感度曲線に合わせ
て周波数特性を補償し、低域周波数成分と共に車室内で
減衰しがちな高域周波数成分をも同時に補償することが
できる。Furthermore, by calculating and giving an impulse response in which the amplitude frequency characteristic is also corrected in the circuit, the frequency characteristic of the reproduced sound is increased by, for example, 5 to 10 decibels in the low frequency band, so that low frequency banding due to vehicle running noise can be reduced. The frequency characteristics can be compensated for according to the Fletcher-Manson isosensitivity curve, and the high-frequency components that tend to attenuate in the vehicle compartment can be compensated together with the low-frequency components.

［実施例］ 第１図は本発明の第１実施例の基本構成を示す接続図
であって、フロントならびにリヤ夫々の左、右チャンネ
ルの入力端子1FL、1FR、1RL、1RRとパワーアンプ3FL、3
FR、3RL、3RRとの間にデジタルフィルタ2FL、2FR、2R
L、2RRが接続され、夫々のパワーアンプ3FL、3FR、3R
L、3RRに夫々前左チャンネルスピーカ4FL、前右チャン
ネルスピーカ4FR、後左チャンネルスピーカ及び後4RL右
チャンネルスピーカ4RRが接続されている。Embodiment FIG. 1 is a connection diagram showing a basic configuration of a first embodiment of the present invention. The left and right channel input terminals 1FL, 1FR, 1RL, 1RR and the power amplifier 3FL, Three
Digital filter 2FL, 2FR, 2R between FR, 3RL, 3RR
L, 2RR are connected, and each power amplifier 3FL, 3FR, 3R
A front left channel speaker 4FL, a front right channel speaker 4FR, a rear left channel speaker, and a rear 4RL right channel speaker 4RR are connected to L and 3RR, respectively.

入力端子1FL、1FR、1RL、1RRには例えばサラウンドス
テレオ等のプログラムソース６が接続されている。A program source 6 such as a surround stereo is connected to the input terminals 1FL, 1FR, 1RL, and 1RR.

この実施例では、前左チャンネルスピーカ4FL、前右
チャンネルスピーカ4FRは自動車のドアーに取付けら
れ、又、後左チャンネルスピーカ後4RL右チャンネルス
ピーカ4RRはリヤパーセルの上に設置されている。In this embodiment, the front left channel speaker 4FL and the front right channel speaker 4FR are mounted on the door of an automobile, and the rear left channel speaker rear 4RL and the right channel speaker 4RR are mounted on a rear parcel.

本実施例のFIRデジタルフィルタの位相特性（群遅延
を補正したもの）の一例をフロントチャンネルを代表例
として第３図に示す。前記Ph（ｆ）が大きく変化する略
80Hz（第２図におけるf1周波数）から1.3KHz（第２図に
おけるf2周波数）の帯域内で、左チャンネルは同図に実
線で、また右チャンネルは点線によって夫々示す特性と
なる様FIRデジタルフィルタのインパルスレスポンスの
係数が設定されている。FIG. 3 shows an example of the phase characteristic (group delay corrected) of the FIR digital filter of this embodiment, taking the front channel as a representative example. Abbreviation where Ph (f) greatly changes
In the band from 80 Hz (f1 frequency in FIG. 2) to 1.3 KHz (f2 frequency in FIG. 2), the left channel is a solid line in the same figure, and the right channel is a FIR digital filter so as to have characteristics shown by a dotted line. The impulse response coefficient is set.

或いは、上記FIR型デジタルフイルタにおいて、振幅
周波数特性を、前記低域を増強せしめたり、フレッチャ
ーマンソンの等感度曲線に合わせた特性となるようにイ
ンパルスレスポンスを設定しておくことにより、位相補
正だけで無く周波数特性の補正も同時に可能である。Alternatively, in the FIR type digital filter, by setting the impulse response such that the amplitude frequency characteristic is enhanced in the low frequency range or the characteristic is adjusted to the characteristic according to the Fletcher Manson isosensitivity curve, only the phase correction is performed. The correction of the frequency characteristic is also possible at the same time.

FIR型デジタルフイルタ2L、2Rによる位相推移帯域を
略80Hzから1.3KHzとしたのは、80Hz以下の帯域では左右
の位相差が少なく、1.3KHz以上の帯域では位相差による
方向定位ができないからである。The reason why the phase shift band by the FIR digital filters 2L and 2R is set to approximately 80KHz to 1.3KHz is that the phase difference between left and right is small in the band below 80Hz, and the direction localization by the phase difference cannot be performed in the band above 1.3KHz. .

第２の実施例は、構成要素並びにその接続は前記第１
実施例と同じであるが、200Hz〜1KHzの周波数帯域に於
て、左右いずれか一方のチャンネルの出力信号の位相が
入力信号に対して60度〜90度進められると共に、他方の
チャンネルの出力信号の位相が入力信号に対して60度〜
90度遅延されて、左右両チャンネルの各出力信号間の位
相差が120度〜180度に設定されている構成である（位相
特性の図示は省略）。In the second embodiment, the components and their connections are the same as those of the first embodiment.
Same as the embodiment, but in the frequency band of 200 Hz to 1 KHz, the phase of the output signal of one of the left and right channels is advanced by 60 degrees to 90 degrees with respect to the input signal, and the output signal of the other channel is Phase of the input signal 60 degrees ~
The configuration is such that the phase difference between the output signals of both the left and right channels is set to 120 to 180 degrees after being delayed by 90 degrees (the phase characteristics are not shown).

この第２の実施例は、デジタルフイルタの特性が、通
常の最も一般的な車内の平均的な伝送特性を補正する様
に設定されているので、第１実施例の如く聴取位置での
位相差特性を測定し、それに基づきデジタルフイルタ特
性を設定するという手数を省略することができ、非常に
手軽に且つさしたる不都合もなく本発明特有の効果を実
現することが出来る。In the second embodiment, since the characteristics of the digital filter are set so as to correct the average transmission characteristics in the most common vehicle, the phase difference at the listening position is different from the first embodiment. The step of measuring the characteristics and setting the digital filter characteristics based on the characteristics can be omitted, and the effects unique to the present invention can be realized very easily and without any inconvenience.

尚、この第２実施例においても前記第１実施例と同じ
く、位相特性と共に周波数特性の補正もすることが出来
る。また、上記各実施例では、位相補正を行う帯域が限
定されているが、全帯域にわたって位相補正を行っても
よいことはいうまでもない。In the second embodiment, similarly to the first embodiment, it is possible to correct not only the phase characteristic but also the frequency characteristic. Further, in each of the above embodiments, the band in which the phase correction is performed is limited. However, it goes without saying that the phase correction may be performed over the entire band.

第10図は第３実施例であって、フロントの左、右チャ
ンネルの入力端子1FL、1FRにデジタルフィルタ2FL、2FR
とパワーアンプ3FL、3FR及びと前左チャンネルスピーカ
4FL、前右チャンネルスピーカ4FRが夫々接続されると共
に、リヤの左、右チャンネルの入力端子1RL、1RRにデジ
タルフィルタ2RL、2RRと位相追加補正用デジタルフィル
タ７、パワーアンプ3RL、3RR及び後左チャンネルスピー
カ及び後4RL右チャンネルスピーカ4RRとが夫々接続され
ている。FIG. 10 shows a third embodiment in which digital filters 2FL and 2FR are connected to input terminals 1FL and 1FR of the left and right channels on the front.
And power amplifier 3FL, 3FR and front left channel speaker
4FL, front right channel speaker 4FR are connected respectively, and digital filters 2RL, 2RR and digital filter 7 for phase addition correction, power amplifiers 3RL, 3RR and rear left channel are connected to input terminals 1RL, 1RR of rear left and right channels. The speaker and the rear 4RL right channel speaker 4RR are connected to each other.

また、第４実施例として、上記第３実施例のリヤの左
右各チャンネルに挿入されたデジタルフィルタ2RL、2RR
と位相追加補正用デジタルフィルタ７を兼用とし、デジ
タルフィルタ2RL、2RRに前述の左右間の位相補正＋Ph
（ｆ）R/2並びに−Ph（ｆ）R/2と共に、−Ph（ｆ）FRを
加えることにより、高価なデジタネフィルタを各チャン
ネルに１個づつとする事ができる。Further, as a fourth embodiment, the digital filters 2RL and 2RR inserted into the left and right channels of the rear of the third embodiment, respectively.
And a digital filter 7 for additional phase correction, and the digital filters 2RL and 2RR have the above-mentioned phase correction between left and right + Ph
By adding -Ph (f) FR together with (f) R / 2 and -Ph (f) R / 2, one expensive digital filter can be provided for each channel.

本発明の上記各実施例の変形例として、前述のごとく
デジタルフイルタに周波数特性を付与する方式に変え
て、夫々の実施例の構成に加えて、左右各チャンネル
に、別途に再生音の周波数特性を補償する周波数特性制
御手段を、各チャンネルのいずれか任意のステージに挿
入しても良い（図面省略）。As a modified example of each of the above embodiments of the present invention, instead of the method of giving frequency characteristics to the digital filter as described above, in addition to the configuration of each embodiment, the frequency characteristics of the reproduced sound are separately added to each of the left and right channels. May be inserted at any stage of each channel (not shown).

この周波数特性制御手段は通常の構造のグラフイック
イコライザ、或いは等価な機器を使用することができ
る。この変形例は、車両の走行雑音による低域マスキン
グに対応せしめたり、フレッチャーマンソンの等感度曲
線に合わせて周波数特性を補償し、低域周波数成分と共
に車室内で減衰しがちな高域周波数成分をも同時に補償
することができる。As this frequency characteristic control means, a graphic equalizer having a normal structure or an equivalent device can be used. This modification corresponds to low-frequency masking due to vehicle running noise, or compensates for frequency characteristics in accordance with Fletcher Manson's iso-sensitivity curve, and removes high-frequency components that tend to attenuate in the passenger compartment together with low-frequency components. Can also be compensated at the same time.

以上、本発明に係る車載用４チャンネルステレオ再生
装置について代表的と思われる実施例を基に詳述した
が、本発明における実施態様は上記実施例に例示された
構造に限定されるものではなく、前記したクレーム記載
の構成要件を具備し、本発明にいう作用を呈し、以下に
述べる効果を有する限りにおいて、適宜改変して実施し
うるものである。As described above, the in-vehicle four-channel stereo reproducing apparatus according to the present invention has been described in detail based on the embodiment which is considered to be representative. However, the embodiment of the present invention is not limited to the structure exemplified in the above embodiment. The present invention can be appropriately modified and implemented as long as it has the components described in the above-described claims, exhibits the function of the present invention, and has the effects described below.

［効 果］ 本発明の車載用４チャンネルステレオ再生装置は、以
下に述べる効果を有する。[Effects] The in-vehicle four-channel stereo playback device of the present invention has the following effects.

（１） 第４図、第５図は上記第１実施例の構成におけ
るフロントのスピーカ群及びリヤのスピーカ群による運
転席での左右間の位相差特性、第６図、第７図はフロン
トのスピーカ群及びリヤのスピーカ群による助手席での
左右間の位相差特性であり、また、第８図、第９図は同
じ運転席においてフロントスピーカ群とリヤスピーカ群
相互間による交錯した左右間の位相差特性をそれぞれ示
したものであって、いずれも実線は実施例、点線は前述
のように位相補正を省略した従来例の場合である。（以
下のすべての位相差の特性図において、位相補正を省略
した場合の特性について2KHz以上の記入は省略されてい
る。） 両位置共に位相補正を省略した場合と比較して位相推
移が減少し、試聴結果においても逆相感が解消している
ことから本発明の効果を確認することが出来る。(1) FIGS. 4 and 5 show the phase difference characteristics between the left and right sides of the driver's seat by the front speaker group and the rear speaker group in the configuration of the first embodiment, and FIGS. 8 and 9 show the phase difference characteristics between the left and right speakers in the passenger seat by the speaker group and the rear speaker group. FIG. 8 and FIG. The phase difference characteristics are respectively shown, and the solid line is the case of the embodiment and the dotted line is the case of the conventional example in which the phase correction is omitted as described above. (In the following characteristic diagrams of all the phase differences, the entry of 2 kHz or more is omitted for the characteristics when the phase correction is omitted.) The phase transition decreases in both positions compared to the case where the phase correction is omitted. In addition, the effect of the present invention can be confirmed from the result of the trial listening since the feeling of opposite phase is eliminated.

第２実施例及び第３実施例とも位相特性の測定結果は
省略したが、いずれも第１実施例とほぼ同様な改善効果
が見られ、音質が改善されていることから本発明の効果
を明瞭に示している。Although the measurement results of the phase characteristics are omitted in both the second embodiment and the third embodiment, almost the same improvement effect as that of the first embodiment is seen, and the effect of the present invention is clear because the sound quality is improved. Is shown in

（２） 左右の聴取位置に対してそれぞれ位相関係が改
善される結果、周波数特性が改善されて、逆相感や歪感
が少なく、自然な定位と音色を有する再生音を得ること
が出来る。(2) As a result of the phase relationship being improved for each of the left and right listening positions, the frequency characteristics are improved, and a reproduced sound having a small sense of inversion and distortion and a natural localization and tone can be obtained.

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

第１図は本発明に係る車載用４チャンネルステレオ再生
装置の構成の説明図、第２図は実施例のデジタルフィル
タの左右の位相差特性の説明図、第３図は第１実施例の
デジタルフィルタの左右の位相差特性図、第４図は第１
実施例のフロントのスピーカ群による運転席での左右間
の位相差特性図、第５図は第１実施例のリヤのスピーカ
群による運転席での左右間の位相差特性図、第６図、第
７図は同じ運転席においてフロントスピーカ群とリヤス
ピーカ群相互間による交錯した左右間の位相差特性図、
第８図、第９図はフロントのスピーカ群及びリヤのスピ
ーカ群による助手席での左右間の位相差特性図、第10図
は第３実施例の構成説明図である。 2FL,2FR,2RL,2RR,は夫々デジタルフィルタ、4FL,4FR,4R
L,4RRは夫々前左チャンネルスピーカ，前右チャンネル
スピーカ，後左チャンネルスピーカ，後右チャンネルス
ピーカ、5Rは運転席、5Lは助手席、７は位相追加補正用
デジタルフィルタである。FIG. 1 is an explanatory diagram of a configuration of a vehicle-mounted 4-channel stereo reproducing apparatus according to the present invention, FIG. 2 is an explanatory diagram of right and left phase difference characteristics of a digital filter of an embodiment, and FIG. FIG. 4 shows the phase difference characteristic between the left and right of the filter.
FIG. 5 is a left-right phase difference characteristic diagram at the driver's seat by the front speaker group of the embodiment, FIG. 5 is a left-right phase difference characteristic diagram at the driver's seat by the rear speaker group of the first embodiment, FIG. 7 is a left-right phase difference characteristic diagram between the front speaker group and the rear speaker group in the same driver seat,
FIGS. 8 and 9 are phase difference characteristic diagrams between the right and left sides of the front passenger seat and the rear speaker group in the front passenger seat, and FIG. 10 is an explanatory diagram of the configuration of the third embodiment. 2FL, 2FR, 2RL, 2RR, are digital filters, respectively, 4FL, 4FR, 4R
L and 4RR denote front left channel speakers, front right channel speakers, rear left channel speakers, and rear right channel speakers, 5R denotes a driver's seat, 5L denotes a passenger seat, and 7 denotes a digital filter for additional phase correction.

Claims (7)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】フロントの左右各チャンネル並びにリヤの
左右各チャンネルに夫々位相補正用デジタルフィルタが
少なくとも１個以上接続されており、フロントならびに
リヤの各左右両チャンネルが正相駆動された場合のフロ
ントの左チャンネルスピーカの再生音と右チャンネルス
ピーカの再生音との、聴取位置に於ける位相差をPh
（ｆ）Ｆとすると、左右いずれか一方のチャンネルの位
相特性が＋Ph（ｆ）F/2だけ補正されるとともに、他方
のチャンネルの位相特性が−Ph（ｆ）F/2だけ補正され
ており、リヤの左右両チャンネルが正相駆動された場合
の左チャンネルスピーカの再生音と右チャンネルスピー
カの再生音との、聴取位置に於ける位相差をPh（ｆ）Ｒ
とすると、左右いずれか一方のチャンネルの位相特性が
＋Ph（ｆ）R/2だけ補正されるとともに、他方のチャン
ネルの位相特性が−Ph（ｆ）R/2だけ補正されているこ
とを特徴とする車載用４チャンネルステレオ再生装置。At least one digital filter for phase correction is connected to each of the left and right channels of the front and each of the left and right channels of the rear, and the front and rear channels when both the left and right channels are driven in the normal phase. The phase difference between the playback sound of the left channel speaker and the playback sound of the right channel speaker at the listening position is Ph
(F) F, the phase characteristic of one of the left and right channels is corrected by + Ph (f) F / 2, and the phase characteristic of the other channel is corrected by -Ph (f) F / 2. The phase difference at the listening position between the playback sound of the left channel speaker and the playback sound of the right channel speaker when both the right and left rear channels are driven in the normal phase is Ph (f) R.
Then, the phase characteristic of one of the left and right channels is corrected by + Ph (f) R / 2, and the phase characteristic of the other channel is corrected by -Ph (f) R / 2. On-board 4-channel stereo playback device. 【請求項２】フロントの左右各チャンネル並びにリヤの
左右各チャンネルに位相補正用のデジタルフイルタが夫
々接続されており、フロント並びにリヤの夫々の左右ス
ピーカ対に於いて左右いずれか一方のチャンネルの出力
信号の位相が入力信号に対して相対的に60度〜90度進め
られると共に、他方のチャンネルの出力信号の位相が入
力信号に対して相対的に60度〜90度遅延されて、左右両
チャンネルの各出力信号間の位相差が120度〜180度に設
定されていることを特徴とする車載用ステレオ再生装
置。2. A digital filter for phase correction is connected to each of the left and right channels of the front and the left and right channels of the rear. The output of one of the left and right channels in each of the front and rear left and right speaker pairs. The phase of the signal is advanced by 60 to 90 degrees relative to the input signal, and the phase of the output signal of the other channel is delayed by 60 to 90 degrees relative to the input signal. Wherein the phase difference between the respective output signals is set to 120 degrees to 180 degrees. 【請求項３】フロントの左右各チャンネルに夫々フロン
ト位相補正用デジタルフィルタが少なくとも１個以上接
続されており、リヤの左右各チャンネルに夫々リヤ位相
補正用デジタルフィルタと位相追加補正用デジタルフィ
ルタとが接続されており、フロントならびにリヤの各左
右両チャンネルが正相駆動された場合に、フロントの左
チャンネルスピーカの再生音と右チャンネルスピーカの
再生音との、聴取位置に於ける位相差をPh（ｆ）Ｆとす
ると、左右いずれか一方のチャンネルの位相特性が＋Ph
（ｆ）F/2だけ補正されるとともに、他方のチャンネル
の位相特性が−Ph（ｆ）F/2だけ補正されており、リヤ
の左右両チャンネルが正相駆動された場合の左チャンネ
ルスピーカの再生音と右チャンネルスピーカの再生音と
の、聴取位置に於ける位相差をPh（ｆ）Ｒとすると、左
右いずれか一方のチャンネルの位相特性が＋Ph（ｆ）R/
2だけ補正されるとともに、他方のチャンネルの位相特
性が−Ph（ｆ）R/2だけ補正され、且つ前記補正後のフ
ロントの左右の合成音の前記補正後のリヤの左右の合成
音との位相差をPh（ｆ）FRとすると、リヤの左右各チャ
ンネルが−Ph（ｆ）FRだけ前記位相追加補正用デジタル
フィルタによって追加補正されていることを特徴とする
車載用４チャンネルステレオ再生装置。At least one front phase correction digital filter is connected to each of the left and right front channels, and a rear phase correction digital filter and a phase addition correction digital filter are respectively connected to the left and right rear channels. When the front and rear left and right channels are driven in the normal phase, the phase difference at the listening position between the reproduced sound of the front left channel speaker and the reproduced sound of the right channel speaker is Ph ( f) If F, the phase characteristic of one of the left and right channels is + Ph
(F) The phase characteristic of the other channel is corrected by F / 2 while the phase characteristic of the other channel is corrected by -Ph (f) F / 2, and the left and right channels of the rear channel are driven in the normal phase. Assuming that the phase difference between the reproduced sound and the reproduced sound of the right channel speaker at the listening position is Ph (f) R, the phase characteristic of one of the left and right channels is + Ph (f) R /
2 and the phase characteristic of the other channel is corrected by -Ph (f) R / 2, and the corrected left and right synthesized sounds of the front left and right synthesized sounds are combined with the corrected rear left and right synthesized sounds. Assuming that the phase difference is Ph (f) FR, the left and right channels on the rear are additionally corrected by -Ph (f) FR by the phase additional correction digital filter. 【請求項４】フロントの左右各チャンネルに夫々フロン
ト位相補正用デジタルフィルタが少なくとも１個以上接
続されており、リヤの左右各チャンネルに夫々リヤ位相
補正用デジタルフィルタと位相追加補正用デジタルフィ
ルタとが接続されており、フロント並びにリヤの夫々の
左右スピーカ対に於いて左右いずれか一方のチャンネル
の出力信号の位相が入力信号に対して60度〜90度進めら
れると共に、他方のチャンネルの出力信号の位相が入力
信号に対して60度〜90度遅延されて、左右両チャンネル
の各出力信号間の位相差が120度〜180度に設定され、且
つ前記位相差設定後のフロントの左右の合成音と前記位
相差設定後のリヤの左右の合成音との位相差をPh（ｆ）
FRとすると、リヤの左右各チャンネルが−Ph（ｆ）FRだ
け前記位相追加補正用デジタルフィルタによって追加補
正されていることを特徴とする車載用４チャンネルステ
レオ再生装置。4. At least one front phase correction digital filter is connected to each of the left and right front channels, and a rear phase correction digital filter and a phase addition correction digital filter are respectively connected to the left and right rear channels. The front and rear left and right speaker pairs are respectively connected so that the phase of the output signal of one of the left and right channels is advanced by 60 to 90 degrees with respect to the input signal, and the output signal of the other channel is The phase is delayed by 60 degrees to 90 degrees with respect to the input signal, the phase difference between each output signal of both the left and right channels is set to 120 degrees to 180 degrees, and the left and right synthesized sounds of the front after setting the phase difference Ph (f) is the phase difference between the left and right synthesized sounds after the phase difference is set.
A four-channel stereo reproduction apparatus for a vehicle, wherein each of the left and right rear channels is additionally corrected by -Ph (f) FR by the phase additional correction digital filter. 【請求項５】フロントの左右各チャンネル並びにリヤの
左右各チャンネルに夫々位相補正用デジタルフィルタが
少なくとも１個以上接続されており、フロントならびに
リヤの各左右両チャンネルが正相駆動された場合に、フ
ロントの左チャンネルスピーカの再生音と右チャンネル
スピーカの再生音との、聴取位置に於ける位相差をPh
（ｆ）Ｆとすると、左右いずれか一方のチャンネルの位
相特性が＋Ph（ｆ）F/2だけ補正されるとともに、他方
のチャンネルの位相特性が−Ph（ｆ）F/2だけ補正され
ており、リヤの左チャンネルスピーカの再生音と右チャ
ンネルスピーカの再生音との聴取位置に於ける位相差を
Ph（ｆ）Ｒとすると、左右いずれか一方のチャンネルの
位相特性が＋Ph（ｆ）R/2だけ補正されると共に、他方
のチャンネルの位相特性が−Ph（ｆ）R/2だけ補正さ
れ、且つ前記補正後のフロントの左右の合成音と前記補
正後のリヤの左右の合成音との位相差をPh（ｆ）FRとす
ると、リヤの左右各チャンネルが−Ph（ｆ）FRだけ追加
補正されていることを特徴とする車載用４チャンネルス
テレオ再生装置。At least one digital filter for phase correction is connected to each of the front left and right channels and the rear left and right channels. When both the front and rear left and right channels are driven in normal phase, The phase difference at the listening position between the playback sound of the front left channel speaker and the playback sound of the right channel speaker is Ph
(F) F, the phase characteristic of one of the left and right channels is corrected by + Ph (f) F / 2, and the phase characteristic of the other channel is corrected by -Ph (f) F / 2. And the phase difference at the listening position between the reproduced sound of the rear left channel speaker and the reproduced sound of the right channel speaker.
Assuming that Ph (f) R, the phase characteristic of one of the left and right channels is corrected by + Ph (f) R / 2, and the phase characteristic of the other channel is corrected by -Ph (f) R / 2. Further, assuming that the phase difference between the corrected left and right synthesized sounds of the front and the corrected rear left and right synthesized sounds is Ph (f) FR, the left and right channels of the rear are additionally corrected by -Ph (f) FR. An in-vehicle four-channel stereo playback device characterized in that: 【請求項６】フロントの左右各チャンネル並びにリヤの
左右各チャンネルに夫々位相補正用デジタルフィルタが
少なくとも１個以上接続されており、フロントならびに
リヤの各左右両チャンネルが正相駆動された場合に、フ
ロント並びにリヤの夫々の左右スピーカ対に於いて左右
いずれか一方のチャンネルの出力信号の位相が入力信号
に対して60度〜90度進められると共に、他方のチャンネ
ルの出力信号の位相が入力信号に対して60度〜90度遅延
されて、左右両チャンネルの各出力信号間の位相差が12
0度〜180度に設定され、且つ前記位相差設定後のフロン
トの左右の合成音と前記位相差設定後のリヤの左右の合
成音との位相差をPh（ｆ）FRとすると、リヤの左右各チ
ャンネルが−Ph（ｆ）FRだけ追加補正されていることを
特徴とする車載用４チャンネルステレオ再生装置。6. At least one digital filter for phase correction is connected to each of the left and right channels of the front and the left and right channels of the rear. When both the front and rear left and right channels are driven in the normal phase, In each of the front and rear left and right speaker pairs, the phase of the output signal of one of the left and right channels is advanced by 60 to 90 degrees with respect to the input signal, and the phase of the output signal of the other channel is changed to the input signal. The phase difference between each output signal of both the left and right channels is 12 to 90 degrees.
Assuming that the phase difference between the right and left synthesized sounds after the phase difference is set and the left and right synthesized sounds after the phase difference is set to Ph (f) FR is 0 to 180 degrees, An in-vehicle four-channel stereo playback device, wherein the left and right channels are additionally corrected by -Ph (f) FR. 【請求項７】上記フロント並びにリヤの夫々の左右各チ
ャンネルに、再生音の周波数特性を補償する周波数特性
制御手段が付加されていることを特徴とする請求項第
１、２、３、４、５及び６記載の車載用ステレオ再生装
置。7. A frequency characteristic control means for compensating frequency characteristics of reproduced sound is added to each of the left and right channels of the front and rear. 7. The in-vehicle stereo reproduction device according to 5 or 6.
JP1329988A 1989-05-29 1989-12-19 In-vehicle 4-channel stereo playback device Expired - Lifetime JP2934673B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13510989 1989-05-29
JP1-135109 1989-05-29

Publications (2)

Publication Number Publication Date
JPH0372800A JPH0372800A (en) 1991-03-27
JP2934673B2 true JP2934673B2 (en) 1999-08-16

Family

ID=15144047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1329988A Expired - Lifetime JP2934673B2 (en) 1989-05-29 1989-12-19 In-vehicle 4-channel stereo playback device

Country Status (1)

Country Link
JP (1) JP2934673B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417870B (en) * 2004-09-02 2009-03-18 John David Michael Rogers Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems
JP4943098B2 (en) * 2006-09-07 2012-05-30 パイオニア株式会社 Sound reproduction system and sound reproduction method
FR2918532B1 (en) * 2007-07-05 2015-04-24 Arkamys METHOD FOR THE SOUND PROCESSING OF A STEREO PHONE SIGNAL INSIDE A MOTOR VEHICLE AND A MOTOR VEHICLE USING THE SAME
JP6609407B2 (en) * 2014-12-22 2019-11-20 新日本無線株式会社 Audio signal reproducing apparatus and audio signal processing method

Also Published As

Publication number Publication date
JPH0372800A (en) 1991-03-27

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