JPS60223294A - Sound field corrector - Google Patents
Sound field correctorInfo
- Publication number
- JPS60223294A JPS60223294A JP7823984A JP7823984A JPS60223294A JP S60223294 A JPS60223294 A JP S60223294A JP 7823984 A JP7823984 A JP 7823984A JP 7823984 A JP7823984 A JP 7823984A JP S60223294 A JPS60223294 A JP S60223294A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- sound field
- level
- delay
- original signal
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は音場補正装置に関し、特にスピーカによる直接
放射音とその反射音とが作る音場内における所定聴取薫
の音場の補正をなす装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a sound field correction device, and more particularly to a device for correcting a sound field in a predetermined listening atmosphere within a sound field created by direct radiation from a speaker and its reflected sound.
背景技術
音響機器の例として磁気テープ再生装置がちシ、この装
置では、再生ヘッドによる再生信号がイコライザ機能を
有する再生アンプにて正規の周波数特性を有する信号と
され増幅され、次段のグラフィックイコライザ等の周波
数特性可変アンプによシ所望の再生周波数特性に調整さ
れてスピーカ駆動信号となる。Background Art An example of audio equipment is a magnetic tape playback device. In this device, the playback signal from the playback head is amplified by a playback amplifier with an equalizer function into a signal with regular frequency characteristics, and then the signal is amplified by a next-stage graphic equalizer, etc. The frequency characteristic variable amplifier adjusts the frequency characteristic to a desired reproduction frequency characteristic and becomes a speaker drive signal.
か\る音響システムにあっては、スピーカ5よシ放射さ
れた音として、例えば第2図に示す音場内の所定聴取点
6へ達する経路は実線7で示すような直接音と点線8に
て示すような壁等による反射音とがある。この場合、聴
取点6では雨音による音の相互干渉によっである周波数
にピークやディップが生じて聴取点6での周波数特性に
乱れが生じる。そこで、グラフィックイコライザ等によ
りこの周波数特性の乱れを補正するようになっている。In such a sound system, the route of the sound radiated from the speaker 5 to the predetermined listening point 6 in the sound field shown in FIG. There is also sound reflected from walls etc. as shown. In this case, at the listening point 6, a peak or a dip occurs at a certain frequency due to mutual interference of sounds due to rain sounds, and the frequency characteristics at the listening point 6 are disturbed. Therefore, a graphic equalizer or the like is used to correct this disturbance in frequency characteristics.
しかしながら、装置の設置状態や聴取位置の変化によっ
てピークやディップ周波数が変化するので、周波数の乱
れも変化する。よって、グラフィックイコライザにより
これを補正しようとする場合には、多数の回路が必要と
なると共にその調整が非常に困難となる。However, since the peak and dip frequencies change depending on the installation state of the device and the listening position, the frequency disturbance also changes. Therefore, if an attempt is made to correct this using a graphic equalizer, a large number of circuits will be required and the adjustment will be extremely difficult.
そこで、本願出願人によシ第1図に示す如き音場補正装
置が提案されている。図において、原信号入力INは遅
延器1において遅延されレベル調整器2へ印〃口される
。レベル制御された信号はインバータ3を介して加算器
4の1人力となり、原信号入力INと加算重畳されるこ
とになる。この加算出力OUTが第2図に示したスピー
カ5の駆動信号となるのである。Therefore, the applicant of the present application has proposed a sound field correction device as shown in FIG. In the figure, an original signal input IN is delayed in a delay device 1 and then output to a level adjuster 2. The level-controlled signal is supplied to the adder 4 via the inverter 3, and is added and superimposed with the original signal input IN. This addition output OUT becomes the drive signal for the speaker 5 shown in FIG.
第2図に示した音場において1反射物が壁等のいわゆる
固定端反射をなすものとしく一般には固定端反射である
としてよい)、原信号INtS1=Aej(Dtとして
遅延器lによる遅延時間を−(Z2−Zl )/c及び
レベル調整器2による調整レベルl KAL1/12と
する。尚、tlは聴取点6までのスピーカ5の直接音7
の径路長、t2は同じく反射音8の径路長、Cは音速、
Aはスピーカの振動面での信号強度、には壁等の反射率
である。In the sound field shown in Fig. 2, one reflecting object is a so-called fixed-end reflection such as a wall, and in general it can be assumed that it is a fixed-end reflection), and the original signal INtS1=Aej (Dt is the delay time due to delay device l). Let be -(Z2-Zl)/c and the adjustment level l KAL1/12 by the level adjuster 2. Note that tl is the direct sound 7 of the speaker 5 up to the listening point 6.
, t2 is the path length of the reflected sound 8, C is the speed of sound,
A is the signal strength on the vibration surface of the speaker, and A is the reflectance of walls, etc.
インパーク3の出力SDは、
Sn”−(KAZ1/12)’eJ(IJ(t−(1z
−lt)/c) ・、・、= (1゜とな)、よって加
期器4の出力S。は、5o=S□十SD
”A”ωt CKAt1/12 )ejωCt−(12
−’t)/c) 、、、(2゜となる。スピーカ5には
この信号S。が印加さnるので、聴取点6における音S
Mは、信号強度が17’Z 1でかつt□/Cの時間遅
れを有する直接音S8と、反射率にで信号強度が1,4
□でかつ12/Cの時間遅れを有する反射音SDとの合
成音となる。よって、SMは次式となる。The output SD of Impark 3 is Sn”-(KAZ1/12)'eJ(IJ(t-(1z
-lt)/c) ・,・,= (1°), therefore, the output S of the accelerator 4. is 5o=S□10SD “A”ωt CKAt1/12 )ejωCt-(12
-'t)/c) , , (2 degrees. Since this signal S is applied to the speaker 5, the sound S at the listening point 6 is
M is a direct sound S8 with a signal strength of 17'Z 1 and a time delay of t□/C, and a signal strength of 1,4 with a reflectance of
It becomes a synthesized sound with the reflected sound SD which is □ and has a time delay of 12/C. Therefore, SM becomes the following formula.
SM=88+5D
=(A/L1)’ノ(c)(t−’y’)(KA/Zz
)’ノω(t−(12−11)7cm1v’c)十(K
A/12)gノω(t−lz/C)−CI<ン”2)C
KAI、/12) eノω(t−CLz−Ll)/c−
1,/c)”(A/1i)eノω(t−’1/C)−C
KAI□/12戸ノ(1)(t−(21′、−Z・)″
) ・・・・・・(3)コ\テ、0≦にく1,0くz1
/12く1であるから。SM=88+5D = (A/L1)'ノ(c)(t-'y')(KA/Zz
)'ノω(t-(12-11)7cm1v'c)ten(K
A/12)gノω(t-lz/C)-CI<n”2)C
KAI, /12) eノω(t-CLz-Ll)/c-
1,/c)"(A/1i)eノω(t-'1/C)-C
KAI□/12 houses (1) (t-(21', -Z・)''
) ......(3) Ko\te, 0≦Niku1,0kuz1
/12 times 1.
(3)式の第2項は第1項に比し十分小となシ、よって
、
SM=+=(A/A、)eノミ+(t−l′t/′)・
、、・・・、、、、、、(4)となシ、反射波が消去さ
れることになるのである。The second term in equation (3) is sufficiently smaller than the first term, so SM=+=(A/A,)e+(t-l't/')・
, , , , , , (4) The reflected waves are eliminated.
しかしながら、上記装置においては、第2図に示した様
に1つの反射音8による干渉に対しては効果的であるが
、実際の音場では第3図に示すように、聴取点6を囲繞
する音場の各壁面からの複数の反射音が当該聴取点6へ
到来するので、こfらすべての反射音をすべて打消すこ
とは不可能である。尚、30は第1図に示した装置を含
むオーディオ再生系を示している。However, although the above device is effective against interference caused by a single reflected sound 8 as shown in FIG. 2, in an actual sound field, as shown in FIG. Since a plurality of reflected sounds from each wall surface of the sound field arrive at the listening point 6, it is impossible to cancel out all of these reflected sounds. Note that 30 indicates an audio reproduction system including the device shown in FIG.
発明の概要
本発明は上記の如き欠点を除去するためになされたもの
であって、その目的とするところは、反射音による影響
をなくすことを可能とした音場補正装置を提供すること
にある。SUMMARY OF THE INVENTION The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to provide a sound field correction device that makes it possible to eliminate the influence of reflected sound. .
本発明による音場補正装置は、原信号のレベル及び位相
を調整して原信号に重畳するに際し、音場内の所定聴取
点に夫々異なる経路にて到達する複数の反射音を打消す
ために、レベル及び位相が異なるように設定さf′した
複数の補正信号を原信号から得るようにしたことを特徴
とする0実施例
以下に1図面を用いて本発明の詳細な説明する0
第4図は本発明の一実施例のブロック囚であシ、第1図
と同等部分は同一符号によフ示している。The sound field correction device according to the present invention, when adjusting the level and phase of the original signal and superimposing it on the original signal, cancels a plurality of reflected sounds that arrive at a predetermined listening point in the sound field through different routes. Embodiment The present invention will be described in detail with reference to one drawing below.FIG. 1 is a block diagram of an embodiment of the present invention, and parts equivalent to those in FIG. 1 are designated by the same reference numerals.
図において、原信号INはn個(2以上の整数)の遅延
器1・1〜1Φnへ夫々入力さ扛ておフ、各遅延出力は
n個のレベル調整器2・1〜2・nへ夫々印加されてい
る。各レベル調整出力はn個のインパーク3・1〜3・
ni夫々介して加算器4の入力とさ扛、原信号INと重
畳される。この加算出力がパワーアンプ9を介してスピ
ーカ5の駆動をなす。In the figure, the original signal IN is input to n (an integer greater than or equal to 2) delay devices 1.1 to 1Φn, respectively, and each delayed output is input to n level adjusters 2.1 to 2.n. are applied respectively. Each level adjustment output has n imparks 3.1 to 3.
It is superimposed on the input of the adder 4 and the original signal IN via each of the input signals IN and NI. This added output drives the speaker 5 via the power amplifier 9.
ここで、遅延器1・1及びレベル調整器2・1の遅延時
間τ及びレベル減衰量αは、第1図の側と同様に反射音
8(第2図参照)の経路ノ2と直接音7の経路長ノ□と
の関数であシ、τ■()2−ノ1)/C及びα父ノ□/
ノ2となる様設定されており、反射音8の影響を打消す
。Here, the delay time τ and the level attenuation amount α of the delay device 1.1 and the level adjuster 2.1 are determined by the path No. 2 of the reflected sound 8 (see FIG. 2) and the direct sound. It is a function of path length no □ of
It is set to be 2, which cancels out the influence of reflected sound 8.
遅延器1・2及びレベル調整器2・2のτ及びαは、他
の反射音の経路長ノ3と直接音の経路長!、との関数で
あシ、τ−,()3−11)/C及びα=、、/ノ3と
なっている。以下同様に、夫々の反射音の経路長と直接
音の経路長との関数とされ、各反射音が夫々打消さ扛る
ように設定さnる。τ and α of delay devices 1 and 2 and level adjusters 2 and 2 are the path length of other reflected sounds and the path length of direct sound! , τ-, ()3-11)/C and α=, , /ノ3. Similarly, it is a function of the path length of each reflected sound and the path length of the direct sound, and is set so that each reflected sound is canceled out.
第5図は本発明の他の実施例のブロック図であり、n個
の遅延器1・1〜1・xf縦続接続し、各縦続接続点か
らの遅延出力fn個のレベル調整器2・1〜2・nへ入
力している。そして、各レベル調整出力がn個のインバ
ータ3・1〜3・nを介して加算器4の各入力とされる
ものである。FIG. 5 is a block diagram of another embodiment of the present invention, in which n delay devices 1.1 to 1.xf are connected in cascade, and fn level adjusters 2.1 are provided with delayed outputs from each cascade connection point. ~2・n is being input. Each level adjustment output is input to the adder 4 via n inverters 3.1 to 3.n.
他の構成は第4図の例と同等である。The other configurations are the same as the example shown in FIG.
ここで、各遅延器1・1〜l・nの遅延出力の遅延時間
は、各遅延器がシリーズ接続であるので前段遅延器によ
る全遅延時間の和となる。すなわち、1番短い反射距離
の反射音は遅延器1・1の出力信号によシ、次に長い反
射距離の反射音は遅延器1・2の出力信号によフ夫々打
消されるもので、他の反射音についても同様である。レ
ベル調整器2・1〜2en及びインバータ3・1〜3・
nの各作用は第4図の例と同等である。Here, since each delay device is connected in series, the delay time of the delayed output of each delay device 1.1 to l.n is the sum of all the delay times of the preceding delay devices. In other words, the reflected sound with the shortest reflection distance is canceled by the output signal of delay devices 1 and 1, and the reflected sound with the next longest reflection distance is canceled by the output signals of delay devices 1 and 2, respectively. The same applies to other reflected sounds. Level adjuster 2.1~2en and inverter 3.1~3.
Each effect of n is equivalent to the example of FIG.
第6図は本発明の更に他の実施例のブロック図で1汎第
4図の例におけるインバータ3・1〜3・3の代シに単
一インバータ3を用いるようにしたものである。そのた
めに、各レベル調整器2・1〜211?Lの出力を加算
器10にて加算してインバータ3を介し加算器4へ供給
するようにしている。FIG. 6 is a block diagram of still another embodiment of the present invention, in which a single inverter 3 is used in place of the inverters 3.1 to 3.3 in the example of FIG. For that purpose, each level adjuster 2.1 to 211? The outputs of L are added by an adder 10 and supplied to an adder 4 via an inverter 3.
第7図は本発明の別の実施例のブロック図であシ、第5
図の例におけるインバータ301〜3−3の代りに単一
のインバータ3を用いるようにしたもので、各レベル調
整器2・1〜2・nの出力を加算器10へ入力し、この
加算出力をインバータ3を介して加算器4へ印加してい
る。FIG. 7 is a block diagram of another embodiment of the present invention;
A single inverter 3 is used instead of the inverters 301 to 3-3 in the example shown in the figure, and the outputs of each level adjuster 2.1 to 2.n are input to the adder 10, and the addition output is applied to the adder 4 via the inverter 3.
効 果
本発明によnば、複雑な音場空間において複雑な反射に
よる周波数特性の乱n2有効に補正可能となる効果があ
る。Effects According to the present invention, it is possible to effectively correct disturbances in frequency characteristics due to complex reflections in a complex sound field space.
第1図は本願出願人により提案中の音場補正装置の例を
示すブロック図、第2図及び第3図は音場空間の例を夫
々示す図、第4図〜第7図は本発明の各実施例のブロッ
ク図である。
主要部分の符号の説明
1・l〜1・n・・・・・・・・・遅延器2・1〜2・
n・・・・・・・・・レベル調整器3.3・1〜3・n
・・・インバータ
4・・・・・・・・・・・・・・・・・・・・・・・・
・・・加算器5・・・・・・・・・・・・・・・・・・
・・・・・・・・・スピーカ出願人 パイオニア株式会
社
代理人 弁理士 藤 村 元 彦FIG. 1 is a block diagram showing an example of a sound field correction device being proposed by the applicant, FIGS. 2 and 3 are diagrams showing examples of sound field spaces, and FIGS. 4 to 7 are diagrams showing the present invention. FIG. 2 is a block diagram of each embodiment of FIG. Explanation of symbols of main parts 1・l~1・n...Delay unit 2・1~2・
n・・・・・・Level adjuster 3.3.1~3.n
・・・Inverter 4・・・・・・・・・・・・・・・・・・・・・
・・・Adder 5・・・・・・・・・・・・・・・・・・
・・・・・・・・・Speaker Applicant Pioneer Co., Ltd. Agent Patent Attorney Motohiko Fujimura
Claims (1)
補正をなす音場補正装置であって、原信号のレベル及び
位相を調整する調整手段と、この調整手段の出力信号と
前記原信号とを重畳して前記スピーカへ供給する手段と
を含み、前記調整手段は、前記音場内の所定聴取点に夫
々異なる経路にて到達する複数の反射音を打消すために
レベル及び位相が夫々異なるように設定された複数の補
正信号を前記原信号から得るよう構成してなることを特
徴とする音場補正装置。A sound field correction device that corrects a sound field created by direct radiation sound from a speaker and its reflected sound, the device comprising: adjustment means for adjusting the level and phase of an original signal; and an output signal of the adjustment means and the original signal. and means for superimposing and supplying the same to the speaker, and the adjusting means adjusts the level and phase to be different in order to cancel out a plurality of reflected sounds that arrive at a predetermined listening point in the sound field through different routes. A sound field correction device characterized in that it is configured to obtain a plurality of correction signals set to from the original signal.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59078239A JPH07105983B2 (en) | 1984-04-18 | 1984-04-18 | Sound field correction device |
EP85302493A EP0160431B1 (en) | 1984-04-09 | 1985-04-09 | Sound field correction system |
DE8585302493T DE3579732D1 (en) | 1984-04-09 | 1985-04-09 | SOUND FIELD IMPROVEMENT SYSTEM. |
US07/077,071 US4868878A (en) | 1984-04-09 | 1987-07-28 | Sound field correction system |
US07/418,042 US4980914A (en) | 1984-04-09 | 1989-10-06 | Sound field correction system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59078239A JPH07105983B2 (en) | 1984-04-18 | 1984-04-18 | Sound field correction device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60223294A true JPS60223294A (en) | 1985-11-07 |
JPH07105983B2 JPH07105983B2 (en) | 1995-11-13 |
Family
ID=13656476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59078239A Expired - Fee Related JPH07105983B2 (en) | 1984-04-09 | 1984-04-18 | Sound field correction device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07105983B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63177699A (en) * | 1986-10-30 | 1988-07-21 | Mazda Motor Corp | Acoustic device for automobile |
JP2012242686A (en) * | 2011-05-20 | 2012-12-10 | Yamaha Corp | Acoustic processing apparatus and parameter setting method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55121793A (en) * | 1979-03-14 | 1980-09-19 | Matsushita Electric Ind Co Ltd | Speaker system |
-
1984
- 1984-04-18 JP JP59078239A patent/JPH07105983B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55121793A (en) * | 1979-03-14 | 1980-09-19 | Matsushita Electric Ind Co Ltd | Speaker system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63177699A (en) * | 1986-10-30 | 1988-07-21 | Mazda Motor Corp | Acoustic device for automobile |
JP2012242686A (en) * | 2011-05-20 | 2012-12-10 | Yamaha Corp | Acoustic processing apparatus and parameter setting method |
US9743214B2 (en) | 2011-05-20 | 2017-08-22 | Yamaha Corporation | Sound processing apparatus and parameter setting method |
Also Published As
Publication number | Publication date |
---|---|
JPH07105983B2 (en) | 1995-11-13 |
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