JP2714098B2 - How to correct acoustic frequency characteristics - Google Patents
How to correct acoustic frequency characteristicsInfo
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- JP2714098B2 JP2714098B2 JP1012837A JP1283789A JP2714098B2 JP 2714098 B2 JP2714098 B2 JP 2714098B2 JP 1012837 A JP1012837 A JP 1012837A JP 1283789 A JP1283789 A JP 1283789A JP 2714098 B2 JP2714098 B2 JP 2714098B2
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- sound
- speaker
- frequency response
- reproduction
- response function
- Prior art date
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Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、音響室の室内環境の変化時に、音響室の周
波数特性の補正を行う音響周波数特性の補正方法に関す
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound frequency characteristic correction method for correcting a frequency characteristic of an acoustic room when a room environment of the acoustic room changes.
[従来の技術] 一般に、音場を再生する場合、音響室内に設置したス
ピーカの放射音の周波数特性だけでなく、音響室の周波
数特性をも考慮し、音響室の音響周波数特性が予め設定
した特性になるように補正する必要があり、このような
スピーカ及び音響室を考慮した全体的な音響周波数特性
を補正するために、グラフィックイコライザ通常用いら
れている。[Related Art] Generally, when reproducing a sound field, not only the frequency characteristics of the radiated sound of a speaker installed in an acoustic room but also the frequency characteristics of the acoustic room are taken into consideration, and the acoustic frequency characteristics of the acoustic room are set in advance. A graphic equalizer is generally used to correct the overall acoustic frequency characteristics in consideration of such a speaker and an acoustic room.
これは、スピーカからホワイトノイズなどの信号音を
放射し、室内のある位置に設置したマイクロホンにより
この信号音を収音し、マイクロホンの出力信号の周波数
特性を測定し、その周波数特性に対して逆特性になるよ
うに、グラフィックイコライザの各周波数チャンネルの
レベル設定を行うものである。This involves radiating a signal sound such as white noise from a speaker, collecting the signal sound with a microphone installed at a certain position in the room, measuring the frequency characteristics of the output signal of the microphone, and reversing the frequency characteristics. The level of each frequency channel of the graphic equalizer is set so as to obtain characteristics.
ところで、最近高忠度音場再生システムの開発が進
み、例えば実際のコンサートホールなどにおいて実測し
た反射音、直接音の特性や残響特性などのデータに基づ
き、実測したコンサートホールにおける反射音、残響
音、と同じ反射音、残響音をデジタル信号処理により形
成し、第4図に示すように、音響室(R)に立体的に配
置した再生スピーカ(S)によりこれを再生して広がり
感のある音場を再生することが考えられている。なお、
第4図中の(P)は実際の受音点を示す。By the way, recently, the development of a high-fidelity sound field reproduction system has been advanced, for example, based on data such as a reflection sound measured in an actual concert hall, a characteristic of a direct sound and a reverberation characteristic, a reflection sound in a concert hall and a reverberation sound. The same reflection sound and reverberation sound are formed by digital signal processing as shown in FIG. 4, and are reproduced by a reproduction speaker (S) three-dimensionally arranged in the acoustic room (R) as shown in FIG. It is considered to reproduce the sound field. In addition,
(P) in FIG. 4 indicates an actual sound receiving point.
ところで、このような高忠度音場再生システムにより
音場を再生する場合、実際の聴取時と同じように音響室
(R)内に各スピーカ(S)を配置した状態で、音響周
波数特性の補正を正確に行う必要がある。By the way, when a sound field is reproduced by such a high fidelity sound field reproduction system, the sound frequency characteristics of the speakers (S) are arranged in the acoustic room (R) in the same manner as in actual listening. Correction must be performed accurately.
[発明が解決しようとする課題] 前記したグラフィックイコライザにより補正を行う場
合、音響室の壁や床の材質、容積などの変化や各スピー
カの配置の変化等、室内環境の変化が生じたときに、そ
の変化毎にマイクロホンを設置して周波数特性の測定を
行い、グラフィックイコライザの各チャンネルの設定を
し直さなければならず、非常に手間がかかり、補正作業
に長時間を要するという問題点があるばかりでなく、グ
ラフィックイコライザの各チャンネルの周波数帯域が広
いため、正確な補正を行うことができないという問題が
あった。[Problems to be Solved by the Invention] When the correction is performed by the graphic equalizer described above, when a change in the indoor environment occurs, such as a change in the material or volume of the wall or floor of the acoustic room or a change in the arrangement of each speaker. However, it is necessary to set up a microphone for each change, measure the frequency characteristics, and reset the settings of each channel of the graphic equalizer, which is very time-consuming and requires a long time for the correction work. Not only that, since the frequency band of each channel of the graphic equalizer is wide, accurate correction cannot be performed.
本発明は、前記の点に留意してなされ、室内環境の変
化が生じたときに、容易に、且つ、正確に音響周波数特
性の補正を行えるようにすることを目的とする。The present invention has been made in consideration of the above points, and has as its object to easily and accurately correct the acoustic frequency characteristics when a change in the indoor environment occurs.
[課題を解決するための手段] 前記目的を達成するために、本発明の音響周波数特性
の補正方法では、音響室内に立体音場再生用の再生スピ
ーカを少なくとも3個配設し、前記各再生スピーカを1
個ずつ順次に音源スピーカとして使用する一方、前記音
源スピーカとして使用中の再生スピーカを除く他の各再
生スピーカ又は該他の各再生スピーカに付設した付設マ
イクロホンを、受音マイクロホンとして使用し、前記音
源スピーカとして使用中の再生スピーカから放射した信
号音を前記各受音マイクロホンにより受音し、それら各
受音マイクロホンの出力信号をそれぞれフーリエ変換し
て前記各受音マイクロホンごとの受音周波数応答関数を
算出するとともに、それら複数の受音周波数応答関数の
平均を前記音響室の測定周波数応答関数として算出し、
その後、予め設定した前記音響室の設定周波数応答関数
を前記測定周波数応答関数により割ってフイルタ周波数
応答関数を導出し、このフイルタ周波数応答関数を逆フ
ーリエ変換してフイルタ係数を導出し、そのフィルタ係
数を前記音源スピーカとして使用中の再生スピーカの前
段に設けた補正用フイルタの係数とすることを特徴とし
ている。Means for Solving the Problems In order to achieve the above object, according to the method for correcting acoustic frequency characteristics of the present invention, at least three reproduction speakers for reproducing a three-dimensional sound field are arranged in an acoustic room, and each of the reproduction speakers is provided. One speaker
Each of the other reproduction speakers except for the reproduction speaker being used as the sound source speaker or an attached microphone attached to each of the other reproduction speakers is used as a sound receiving microphone while the sound source speaker is used as a sound source microphone. A signal sound radiated from a reproduction speaker being used as a speaker is received by each of the sound receiving microphones, and an output signal of each of the sound receiving microphones is Fourier-transformed to obtain a sound receiving frequency response function for each of the sound receiving microphones. Calculating and calculating an average of the plurality of sound receiving frequency response functions as a measured frequency response function of the acoustic room,
Thereafter, a filter frequency response function is derived by dividing the preset frequency response function of the acoustic chamber by the measurement frequency response function, and the filter frequency response function is inverse Fourier transformed to derive filter coefficients. Is a coefficient of a correction filter provided in the preceding stage of the reproduction speaker being used as the sound source speaker.
[作用] 以上のように構成されているため、室内環境の変化が
生じたときには、室内に配置した各再生スピーカが1個
ずつ順次に音源スピーカとして使用され、その音源スピ
ーカから発信された信号音を受音した音源スピーカを除
く他の各再生スピーカ又は該他の各再生スピーカに付設
した付設マイクロホンの出力信号から受音周波数応答関
数が算出され、それら複数の各受音周波数応答関数を平
均化した測定周波数応答関数に基づいて補正用のフィル
タ係数が導出され、その係数が当該係数算出時に音源ス
ピーカとして使用中の再生スピーカの前段に設けた補正
用フィルタについての係数とされる。[Operation] With the above-described configuration, when a change in the indoor environment occurs, each of the reproduction speakers arranged in the room is sequentially used as a sound source speaker one by one, and a signal sound transmitted from the sound source speaker is generated. The sound receiving frequency response function is calculated from the output signal of each of the other reproduction speakers except for the sound source speaker that received the sound or the microphone attached to each of the other reproduction speakers, and the plurality of sound reception frequency response functions are averaged. A filter coefficient for correction is derived based on the measured frequency response function thus obtained, and the coefficient is used as a coefficient for a correction filter provided in a preceding stage of a reproduction speaker being used as a sound source speaker when calculating the coefficient.
[実施例] 実施例について第1図ないし第3図を参照して説明す
る。Embodiment An embodiment will be described with reference to FIG. 1 to FIG.
音響室内の周波数特性の測定系を示す第1図におい
て、(1)は音響室、(2a)、(2b)、(2c)、(2d)
は立体音場再生用の4個の再生スピーカである。その再
生スピーカ(2a)〜(2d)は、音響室(1)内において
各々の所定位置に配置されており、周波数特性補正時に
は、各再生スピーカ(2a)〜(2d)が1個ずつ順次に音
源スピーカとして使用される一方、その音源スピーカと
して使用中の再生スピーカを除く他の各再生スピーカが
受音マイクロホンとして使用される。In FIG. 1 showing a measurement system of frequency characteristics in an acoustic room, (1) is an acoustic room, (2a), (2b), (2c), (2d).
Are four reproduction speakers for reproducing a three-dimensional sound field. The reproduction speakers (2a) to (2d) are arranged at respective predetermined positions in the acoustic room (1). When the frequency characteristics are corrected, each of the reproduction speakers (2a) to (2d) is sequentially placed one by one. While being used as a sound source speaker, each reproduction speaker other than the reproduction speaker being used as the sound source speaker is used as a sound receiving microphone.
さらに、第1図において、(3)はインパルス信号発
生器、(4)は信号発生器(3)からのインパルス信号
を増幅するアンプ、(5a)〜(5c)は受音マイクロホン
としての再生スピーカに接続される電圧制限回路、(6
a)〜(6c)は受音マイクロホンとしての各再生スピー
カの出力信号をそれぞれA/D変換するA/D変換器、(7a)
〜(7c)は各A/D変換器(6a)〜(6c)の出力をそれぞ
れフーリエ変換して受音周波数応答関数を算出するFF
T、(8)は各FFT(7a)〜(7c)による受音周波数応答
関数の平均をとり、補正されたフィルタ周波数応答関数
を導出する演算部、(9)は逆フーリエ変換部であり、
フィルタ周波数応答関数を逆フーリエ変換してフィルタ
係数を導出し、このフィルタ係数が、音源スピーカの前
段に設けられた補正用フィルタの係数とされる。Further, in FIG. 1, (3) is an impulse signal generator, (4) is an amplifier for amplifying an impulse signal from the signal generator (3), and (5a) to (5c) are reproduction speakers as sound receiving microphones. Voltage limiting circuit connected to (6
a) to (6c) are A / D converters that A / D convert the output signals of each playback speaker as a sound receiving microphone, respectively, (7a)
To (7c) are FFs that calculate the sound receiving frequency response function by Fourier transforming the outputs of the A / D converters (6a) to (6c), respectively.
T, (8) is an arithmetic unit for averaging the sound receiving frequency response functions by the FFTs (7a) to (7c) and deriving a corrected filter frequency response function, and (9) is an inverse Fourier transform unit.
A filter coefficient is derived by performing an inverse Fourier transform on the filter frequency response function, and this filter coefficient is used as a coefficient of a correction filter provided in a preceding stage of the sound source speaker.
つぎに、信号処理の手順について第2図を用いて説明
する。Next, a signal processing procedure will be described with reference to FIG.
いま、例えば再生スピーカ(2a)を音源スピーカとし
て使用する場合について説明すると、音源スピーカとし
て使用される再生スピーカ(2a)を除く他の3個の再生
スピーカ(2b)〜(2d)が受音マイクロホンとして使用
される。Now, for example, the case where the reproduction speaker (2a) is used as a sound source speaker will be described. Except for the reproduction speaker (2a) used as a sound source speaker, three other reproduction speakers (2b) to (2d) receive sound. Used as
第2図に示すように、信号発生器(3)からのインパ
ルス信号は、アンプ(4)により増幅されて音源スピー
カとして使用中のスピーカ(2a)に供給され、そのスピ
ーカ(2a)から放射される。そして、スピーカ(2a)か
ら放射されたインパルス信号は、受音マイクロホンとし
て使用中のスピーカ(2b)〜(2d)により受音され、そ
れら各スピーカ(2b)〜(2d)の出力信号が電圧制限回
路(5a)〜(5c)をそれぞれ介してA/D変換器(6a)〜
(6c)に入力され、デジタル信号に変換される。As shown in FIG. 2, the impulse signal from the signal generator (3) is amplified by an amplifier (4), supplied to a speaker (2a) being used as a sound source speaker, and radiated from the speaker (2a). You. The impulse signal radiated from the speaker (2a) is received by the speakers (2b) to (2d) being used as sound receiving microphones, and the output signals of the speakers (2b) to (2d) are subjected to voltage limiting. A / D converter (6a) through circuit (5a) through (5c) respectively
Input to (6c) and converted to digital signal.
このとき、各スピーカ(2b)〜(2d)の出力レベルが
所定レベルより低いときには、暗騒音として電圧制限回
路(5a)〜(5c)によりA/D変換器(6a)〜(6c)への
入力が遮断される。At this time, when the output level of each of the speakers (2b) to (2d) is lower than a predetermined level, the noise is transmitted to the A / D converters (6a) to (6c) by the voltage limiting circuits (5a) to (5c) as background noise. Input is cut off.
つぎに、各A/D変換器(6a)〜(6c)の出力がそれぞ
れFFT(7a)〜(7c)によりフーリエ変換されて受音周
波数応答関数が算出され、演算部(8)にて、各受音周
波数応答関数の平均がとられて音響室(1)の測定周波
数応答乱数H1(z)が算出される。その後、予め設定さ
れた音響室(1)の周波数応答関数H2(z)を測定周波
数応答関数H1(z)で割ることによりフィルタ周波数応
答関数H3(z)(=H2(z)/H1(z))が導出され、
逆フーリエ変換器(9)により、フィルタ周波数応答関
数H3(z)が逆フーリエ変換されてフィルタ係数が導出
される。Next, the outputs of the A / D converters (6a) to (6c) are Fourier-transformed by the FFTs (7a) to (7c) to calculate a sound receiving frequency response function. The average of each sound receiving frequency response function is calculated, and the measured frequency response random number H1 (z) of the acoustic room (1) is calculated. Thereafter, the filter frequency response function H3 (z) (= H2 (z) / H1 (z) is obtained by dividing the preset frequency response function H2 (z) of the acoustic room (1) by the measured frequency response function H1 (z). )) Is derived,
The filter frequency response function H3 (z) is inverse Fourier transformed by the inverse Fourier transformer (9) to derive filter coefficients.
そして、例えば第3図の高忠度音場再生システムにお
いて、音源スピーカとして使用中の再生スピーカ(2a)
の前段に設けられた補正用フィルタ(10a)の係数とし
て、前記したように導出されたフィルタ係数が設定され
ると共に、他の各再生スピーカ(2b)〜(2d)を1個ず
つ順次に音源スピーカとした場合について前記した測定
が同様に繰り返され、第3図に示すように各再生スピー
カ(2b)〜(2d)の前段にそれぞれ設けられた補正用フ
ィルタ(10b)〜(10d)の係数の設定が行われる。Then, for example, in the high-fidelity sound field reproduction system shown in FIG. 3, a reproduction speaker (2a) being used as a sound source speaker
The filter coefficients derived as described above are set as the coefficients of the correction filter (10a) provided at the preceding stage of the above, and the other reproduction speakers (2b) to (2d) are sequentially output to the sound source one by one. The above-described measurement is repeated in the same manner in the case of a speaker, and as shown in FIG. 3, the coefficients of the correction filters (10b) to (10d) provided before the reproduction speakers (2b) to (2d), respectively. Is set.
ところで、第3図において、(11)はチューナ、CDプ
レーヤなどの音響ソース、(12)はプリアンプ、(13)
は残響回路である。By the way, in FIG. 3, (11) is an acoustic source such as a tuner or a CD player, (12) is a preamplifier, and (13)
Is a reverberation circuit.
従って、前記実施例によると、音響室(1)の壁、床
の材質の変化やスピーカ配置の変化などの室内環境の変
化が生じた場合に、従来のように環境の変化毎に室内に
マイクロホンを設置して周波数特性を測定する必要がな
く、既設の再生スピーカ(2a)〜(2d)を使って音響室
の周波数応答関数を測定して補正用フィルタ(10a)〜
(10d)の係数を導出することができ、また、その補正
用フィルタ(10a)〜(10d)の係数導出にあたってフー
リエ変換を用いたことによって、周波数帯域を細分化し
た処理を行うことができるため、従来に比べ、簡単に短
時間で正確な音響周波数特性の補正を行うことができ、
室内環境の変化に容易に対処することが可能となる。Therefore, according to the above-described embodiment, when a change in the indoor environment such as a change in the material of the wall and floor of the acoustic room (1) or a change in the speaker arrangement occurs, the microphone is placed in the room every time the environment changes as in the related art. It is not necessary to measure the frequency characteristics by installing the existing speakers, and measure the frequency response function of the acoustic room using the existing reproduction speakers (2a) to (2d) to correct the filter (10a) to
Since the coefficient of (10d) can be derived, and the Fourier transform is used to derive the coefficients of the correction filters (10a) to (10d), processing that subdivides the frequency band can be performed. , It is possible to easily and accurately correct sound frequency characteristics in a shorter time than before,
It is possible to easily cope with changes in the indoor environment.
なお、前記実施例では、音源スピーカを除く再生スピ
ーカそのものを受音マイクロホンとして使用する場合に
ついて説明したが、これらの再生スピーカに付設した付
設マイクロホンを受音マイクロホンとしてもよいのは勿
論である。In the above-described embodiment, the case where the reproduction speakers themselves except the sound source speakers are used as the sound receiving microphones is described. However, the microphones attached to these reproduction speakers may be used as the sound receiving microphones.
[発明の効果] 本発明によれば、再生スピーカ等の既設機器のみを用
いて簡単に且つ短時間で音響周波数特性の補正を行うこ
とができ、更に、音響室内で1個ずつ順次に音源スピー
カとなる各再生スピーカ毎に当該1個の再生スピーカに
ついてフーリエ変換を用いて複数の受音周波数応答関数
を得た上で、それら複数の各受音周波数応答関数を平均
化して当該音響室内における測定周波数応答関数を算出
しているので、反射音や残響音等という音響周波数特性
に影響を与える各種条件が存在する音響室内の受音点で
実際に聴取した場合の周波数応答関数に近い測定周波数
応答関数を得ることができるとともに、最終的に得られ
たフィルタ係数を当該係数算出時に音源スピーカとして
使用中の再生スピーカの前段に設けた補正用フィルタに
ついての係数とし、そのような係数の算出を各再生スピ
ーカを1個ずつ順次に音源スピーカとして使用すること
により行っているので、音響室内における各再生スピー
カの配置環境を考慮した音響周波数特性の補正を各再生
スピーカ毎に個別に反映して正確に行うことができる。[Effects of the Invention] According to the present invention, sound frequency characteristics can be corrected easily and in a short time by using only existing equipment such as a reproduction speaker, and furthermore, a sound source speaker is sequentially output one by one in an acoustic room. After obtaining a plurality of sound receiving frequency response functions for each of the reproducing speakers by using the Fourier transform for each of the reproducing speakers, averaging the plurality of sound receiving frequency response functions and performing measurement in the acoustic room. Since the frequency response function is calculated, the measured frequency response is close to the frequency response function when actually listening at the sound receiving point in the acoustic room where there are various conditions that affect the acoustic frequency characteristics such as reflected sound and reverberant sound A function can be obtained, and the finally obtained filter coefficient can be used for a correction filter provided in front of a reproduction speaker used as a sound source speaker when calculating the coefficient. Since the calculation of such coefficients is performed by sequentially using each reproduction speaker one by one as a sound source speaker, the acoustic frequency characteristics are corrected in consideration of the arrangement environment of each reproduction speaker in the acoustic room. Can be accurately reflected individually for each reproduction speaker.
第1図ないし第3図は本発明の音響周波数特性の補正方
法の第1実施例を示し、第1図は周波数特性の測定系の
ブロック図、第2図は第1図の動作説明図、第3図は高
忠度音場再生システムのブロック図、第4図は一般の立
体音場再生用のスピーカの室内配置例を示す斜視図であ
る。 (1)……音響室、(2a)〜(2d)……再生スピーカ、
(7a)〜(7c)……FFT、(8)……演算部、(9)…
…逆フーリエ変換部。1 to 3 show a first embodiment of a method for correcting an acoustic frequency characteristic according to the present invention, FIG. 1 is a block diagram of a frequency characteristic measuring system, FIG. 2 is an operation explanatory diagram of FIG. FIG. 3 is a block diagram of a high-fidelity sound field reproduction system, and FIG. 4 is a perspective view showing an example of an indoor arrangement of speakers for reproducing a general three-dimensional sound field. (1) Acoustic room, (2a)-(2d) ... Reproduction speaker,
(7a) to (7c): FFT, (8): Operation unit, (9):
... Inverse Fourier transform unit.
Claims (1)
を少なくとも3個配設し、前記各再生スピーカを1個ず
つ順次に音源スピーカとして使用する一方、前記音源ス
ピーカとして使用中の再生スピーカを除く他の各再生ス
ピーカ又は該他の各再生スピーカに付設した付設マイク
ロホンを、受音マイクロホンとして使用し、前記音源ス
ピーカとして使用中の再生スピーカから放射した信号音
を前記各受音マイクロホンにより受音し、それら各受音
マイクロホンの出力信号をそれぞれフーリエ変換して前
記各受音マイクロホンごとの受音周波数応答関数を算出
するとともに、それら複数の受音周波数応答関数の平均
を前記音響室の測定周波数応答関数として算出し、その
後、予め設定した前記音響室の設定周波数応答関数を前
記測定周波数応答関数により割ってフイルタ周波数応答
関数を導出し、このフイルタ周波数応答関数を逆フーリ
エ変換してフイルタ係数を導出し、そのフィルタ係数を
前記音源スピーカとして使用中の再生スピーカの前段に
設けた補正用フイルタの係数とすることを特徴とする音
響周波数特性の補正方法。1. A reproduction speaker in which at least three reproduction speakers for reproducing a three-dimensional sound field are arranged in an acoustic room, and each of the reproduction speakers is used one by one as a sound source speaker, while being used as the sound source speaker. Each of the other reproduction speakers except for the above or an attached microphone attached to each of the other reproduction speakers is used as a sound reception microphone, and the signal sound radiated from the reproduction speaker being used as the sound source speaker is received by the respective sound reception microphones. The output signal of each of the sound-receiving microphones is Fourier transformed to calculate a sound-receiving frequency response function for each of the sound-receiving microphones, and the average of the plurality of sound-receiving frequency response functions is measured in the acoustic chamber. Calculated as a frequency response function, and then the preset frequency response function of the acoustic room is set to the measured frequency response. The filter frequency response function is derived by dividing by a number, a filter coefficient is derived by performing an inverse Fourier transform of the filter frequency response function, and the filter coefficient is used as a correction filter provided in a stage preceding a reproduction speaker being used as the sound source speaker. A method for correcting acoustic frequency characteristics, characterized by using a coefficient of
Priority Applications (1)
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JP1012837A JP2714098B2 (en) | 1989-01-20 | 1989-01-20 | How to correct acoustic frequency characteristics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1012837A JP2714098B2 (en) | 1989-01-20 | 1989-01-20 | How to correct acoustic frequency characteristics |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02193500A JPH02193500A (en) | 1990-07-31 |
JP2714098B2 true JP2714098B2 (en) | 1998-02-16 |
Family
ID=11816495
Family Applications (1)
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JP1012837A Expired - Fee Related JP2714098B2 (en) | 1989-01-20 | 1989-01-20 | How to correct acoustic frequency characteristics |
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JP (1) | JP2714098B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2870562B2 (en) * | 1992-11-30 | 1999-03-17 | 日本ビクター株式会社 | Method of sound image localization control |
JP2723001B2 (en) * | 1993-07-16 | 1998-03-09 | ヤマハ株式会社 | Acoustic characteristic correction device |
KR100532452B1 (en) * | 2003-07-22 | 2005-11-30 | 삼성전자주식회사 | System and method for reproducing audio signals |
JP4665722B2 (en) * | 2005-11-09 | 2011-04-06 | ヤマハ株式会社 | Speaker array system and calibration method |
CN109696660B (en) * | 2019-01-21 | 2024-03-22 | 广西科技大学 | Method for accurately measuring amplitude sensitivity and phase of microphone for detecting free sound field |
JP2021196582A (en) | 2020-06-18 | 2021-12-27 | ヤマハ株式会社 | Acoustic characteristic correction method and acoustic characteristic correction device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS60254997A (en) * | 1984-05-31 | 1985-12-16 | Pioneer Electronic Corp | Measuring method of acoustic characteristic in automobile |
JPS6165700A (en) * | 1984-09-07 | 1986-04-04 | Matsushita Electric Ind Co Ltd | Speaker device mounted on vehicle |
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1989
- 1989-01-20 JP JP1012837A patent/JP2714098B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH02193500A (en) | 1990-07-31 |
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