JPH02237400A - Sound field correction device - Google Patents
Sound field correction deviceInfo
- Publication number
- JPH02237400A JPH02237400A JP1058363A JP5836389A JPH02237400A JP H02237400 A JPH02237400 A JP H02237400A JP 1058363 A JP1058363 A JP 1058363A JP 5836389 A JP5836389 A JP 5836389A JP H02237400 A JPH02237400 A JP H02237400A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- sound field
- peak
- field correction
- correction filter
- 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
- 230000003321 amplification Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、車室内等の特定の場所の音場の伝達関数を、
所望の伝達関数に補正する音場補正装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for determining the transfer function of a sound field at a specific location such as a vehicle interior.
The present invention relates to a sound field correction device that corrects a desired transfer function.
従来の技術
第３図は従来の音場補正装置の構成を示すブロック図で
ある。第３図において、１はＣＤプレーヤ等の音響信号
発生器（ディジタル）であり、２の音場補正フィルタに
接続されている。２は、あらかじめ測定した音場の伝達
特性を補正するような特性をもったフィルタでる。３は
音場補正フィルタの出力をアナログに変換するＤ／Ａ変
換器、４はアナログ信号３を増幅する増幅器、５は増幅
器４に接続されたスビーカである。BACKGROUND OF THE INVENTION FIG. 3 is a block diagram showing the configuration of a conventional sound field correction device. In FIG. 3, 1 is an acoustic signal generator (digital) such as a CD player, which is connected to a sound field correction filter 2. In FIG. Reference numeral 2 denotes a filter having characteristics that correct the transfer characteristics of the sound field measured in advance. 3 is a D/A converter that converts the output of the sound field correction filter into an analog signal; 4 is an amplifier that amplifies the analog signal 3; and 5 is a speaker connected to the amplifier 4.
次に上記従来例の動作について説明する。第３３ヘ−ジ
図において、音響信号発生器１から出力されたディジタ
ル信号は、音場補正フィルタ２に入力され、フィルタリ
ングされた後、Ｄ／Ａ変換器３でアナログ信号に変換さ
れ、増幅器４にて増幅され、スピーカ５より放射される
。Next, the operation of the above conventional example will be explained. In the 33rd Hage diagram, the digital signal output from the acoustic signal generator 1 is input to the sound field correction filter 2, and after being filtered, it is converted to an analog signal by the D/A converter 3, and then the digital signal is sent to the amplifier 4. The signal is amplified and radiated from the speaker 5.
ここで、スピーカ５のおかれた音場の、スピカ入力端子
から受聴位置までの伝達関数をＨ、音場補正フィルタの
入力から受聴位置まで所望の伝達関数をＫとし，音場補
正フィルタ２への入力信号を■、音場補正フィルタ２の
伝達関数をＡ， Ｄ／Ａ変換器３３．−よび増幅器４の
伝達関数を１とすると、次式の関係が成シ立つ（ここで
Ｈ， Ｋ， Ｉ，Ａ等は周波数領域での表現）。Here, the transfer function from the speaker input terminal to the listening position in the sound field in which the speaker 5 is placed is H, the desired transfer function from the input of the sound field correction filter to the listening position is K, and the transfer function is transferred to the sound field correction filter 2. , the input signal of the sound field correction filter 2 is A, and the D/A converter 33. - and the transfer function of the amplifier 4 is set to 1, then the following relationship holds true (here, H, K, I, A, etc. are expressed in the frequency domain).
Ｈ−Ａ・Ｉ＝Ｋ・工
’ Ａ＝Ｋ／Ｈ
このように、上記従来の音場補正装置でも、音場補正フ
ィルタの伝達関数Ａを、上式のように設定することで音
場特性を補正することができる。H-A・I=K・工' A=K/H In this way, even in the conventional sound field correction device described above, the sound field characteristics can be adjusted by setting the transfer function A of the sound field correction filter as shown in the above equation. can be corrected.
発明が解決しようとする課題
しかしながら、上記従来の音場補正装置では、補正対象
の伝遵関数Ｈが急激なディプを有する場合、そのディプ
を補正しようとするために、音場補正フィルタの伝達関
数Ａは、特定の周波数にピークをもち、スピーカから再
生された信号は聴感上不自然になってしまうという問題
があった。Problems to be Solved by the Invention However, in the conventional sound field correction device described above, when the transmission function H to be corrected has a sharp dip, in order to correct the dip, the transfer function of the sound field correction filter is A has a problem in that it has a peak at a specific frequency, and the signal reproduced from the speaker sounds unnatural.
本発明はこのような従来の問題を解決するものであり、
補正された信号が、聴感上不自然でないようにスピーカ
から再生できる優れた音場補正装置を提供することを目
的とするものである。The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent sound field correction device that can reproduce a corrected signal from a speaker so that it does not sound unnatural.
課題を解決するだめの手段
本発明は上記目的を達成するために、従来の音場補正装
置に、ピーク補正フィルタを設け、音場袖正フィルタの
伝達関数Ａの特徴は保存し、急激なピークだけを平滑化
するようにしたものである。Means for Solving the Problems In order to achieve the above object, the present invention provides a peak correction filter in a conventional sound field correction device, preserves the characteristics of the transfer function A of the sound field correction filter, and eliminates sudden peaks. It is designed to smooth only the
作 用
したがって、本発明によれば，音場補正フィルタの周波
数特性の急激なピークだけを補正することによって、そ
のピークを平滑化するここができ、また急激なピーク以
外は平滑化しないために、音場補正フィルタの周波数特
性を保存することがで５へ一ノ
さ，聴感的により自然な信号をスビーカから再生するこ
とができるという効果を有する。Therefore, according to the present invention, by correcting only the sharp peaks in the frequency characteristics of the sound field correction filter, it is possible to smooth the peaks, and since the peaks other than the sharp peaks are not smoothed, By preserving the frequency characteristics of the sound field correction filter, it is possible to reproduce an audibly more natural signal from the speaker.
実施例
第１図は、本発明の一実施例の構成を示すブロック図で
ある。第１図において、１は、ＣＤプレヤ等のディジタ
ル音響信号発生器であり、その出力は音場補正フィルタ
２に接続されている。音場補正フィルタ２は、スピーカ
５から受聴点に至る音場の伝達関数を補正するためのデ
ィジタルフィルタで、ＦＩＲ（Ｆｉｎｉｔｅ Ｉｍｐｕ
ｌｓｅ Ｒｅｓｐｏｎｓｅ）フィルタで構成される。Ｆ
ＩＲフィルタの係数は後述のフィルタ係数算出手段６で
計算し、設定する。Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 1 is a digital acoustic signal generator such as a CD player, the output of which is connected to a sound field correction filter 2. In FIG. The sound field correction filter 2 is a digital filter for correcting the transfer function of the sound field from the speaker 5 to the listening point.
response) filter. F
The coefficients of the IR filter are calculated and set by a filter coefficient calculating means 6, which will be described later.
３は、音場補正された信号をアナログ信号に変換するＤ
／Ａ変換器で，４は、そのアナログ信号を増幅する増幅
器、５は、増幅器４の出力を音に変換するスピーカであ
る。3 is D for converting the sound field corrected signal into an analog signal.
In the /A converter, 4 is an amplifier that amplifies the analog signal, and 5 is a speaker that converts the output of the amplifier 4 into sound.
６は、フィルタ係数算出手段で、その入力端子■には、
スピーカの入力端子から受聴点迄のインパルス応答ｈ（
１｝が入力し、入力端子■には、音場６・＼−・
補正フィルタから受聴点に至る全系の所望のインするＦ
ＦＴ（Ｆａｓｔ Ｆｏｕｒｉｅｒ Ｔｒａｎｓｆｏｒｍ
）で、それぞれｈ （ｉｌおよびｋ （ｉｌが入力し、
Ｈ（ｎｌおよびＫ （ｎ）に変換し出力する。６２は、
フィルタ特性算出器で、次式の演算により、フィルタ特
性Ａ （ｎｌを出力する。6 is a filter coefficient calculation means, and its input terminal ■ is
Impulse response h(
1} is input, and the input terminal ■ receives the desired input F of the entire system from the correction filter to the listening point.
FT (Fast Fourier Transform)
), respectively h (il and k (il input,
Convert to H(nl and K(n) and output. 62 is
The filter characteristic calculator outputs the filter characteristic A (nl) by calculating the following equation.
Ａ （ｎｌ ＝ Ｋ （ｎｌ ／ Ｈ （ｎｌただし
Ｈ （ｎｌ ＝ Ｘ２ ｈ （ｉｉ ＷＮフ０
Ｋ （ｎ） ＝ ’Ｘ：２ ｋ （ｉ ｌ ＷＮ斎；０
ＷＮ ＝ ｅ−”Ｎ
６３は、ピーク補正フィルタで．Ａ（ｎｌの急激なピー
クだけを平滑化するために、ある周波数ｋにおけるＡ
（ｎｌの値をＡ （ｋ＋とし、次の演算を行う。A (nl = K (nl / H (nlHowever, H (nl = X2 h (ii WNfu0 K (n) = ' A correction filter is used to smooth only the sharp peaks of .A(nl) at a certain frequency k.
(The value of nl is set to A (k+, and the following calculation is performed.
Ａ（ｋｌ＝ （ ｂＡ（ｋｌ＋ｃ Ｂ ）／ｄ；（Ａ（
ｋｌ≧ａＢのとき）
＝ Ａ （ｋｌ ； （ Ａ（ｋｌ＜ ａ
Ｂのとき）７／＼−７
ただし
ここで、ＢはＡ （ｋ＋の前後におけるＬ個のＡ（１）
の平均値であり、ａ， ｂ，Ｃ，Ｌ ｊ＋ Ｌ等
は音場の状態により適切な値を選定する。A(kl=(bA(kl+cB)/d;(A(
When kl≧aB) = A (kl; (A(kl< a
B) 7/\-7 However, here, B is A (L A(1) before and after k+
, and appropriate values for a, b, C, L j+ L, etc. are selected depending on the state of the sound field.
上式は、Ａ （ｋ＋がａＢよシ大きい場合、Ａ（ｋ＋を
それよシ小さな値に置き換えるものである０６４は、ピ
ーク補正されたＡ （ｋ＋を逆離散フーリ工変換する逆
ＦＦＴで、その出力は時間領域で表現された補正係数で
ある。この補正係数は音場補正フィルタ２の係数として
、あらかじめ設定される。The above formula is, when A(k+ is larger than aB, A(k+ is replaced with a smaller value). The output is a correction coefficient expressed in the time domain. This correction coefficient is set in advance as a coefficient of the sound field correction filter 2.
次に、上記実施例の動作について説明する。Next, the operation of the above embodiment will be explained.
初めに、音場補正フィルタ２の係数を設定するときの動
作について説明する。First, the operation when setting the coefficients of the sound field correction filter 2 will be explained.
フィルタ係数算出千段６の入力端子■に、あらかじめ測
定した受聴点のインパルス応答ｈ（１｝を入力し、入力
端子■に、所望のインパルス応答ｋ（１）を入力すると
、これらはＦＦＴ６１で離散フーリ工変換され，それぞ
れＨ （ｎｌ， Ｋ （ｎ）となる。この出力を受けて
、フィルタ特性算出器６２でフィルタ特性Ａ （ｎ．ｌ
が計算され、ピーク補正フィルタ６３でピーク補正され
た後、逆ＦＦＴ６４で逆離敬フリエ変換されて、補正係
数が求められる。この補正係数は音場補正フィルタ２の
中に設定され、フィルタ特性Ａ（ｎｌが定められる。Input the impulse response h(1) of the listening point measured in advance to the input terminal ■ of the filter coefficient calculation stage 6, and input the desired impulse response k(1) to the input terminal ■.These are discretely processed by FFT61. They are Fourier transformed and become H (nl, K (n), respectively. Upon receiving this output, the filter characteristic calculator 62 calculates the filter characteristic A (n.l
is calculated, subjected to peak correction by a peak correction filter 63, and then subjected to inverse FFT 64 to obtain a correction coefficient. This correction coefficient is set in the sound field correction filter 2, and the filter characteristic A(nl) is determined.
次に、音場補正装置の動作について説明する。Next, the operation of the sound field correction device will be explained.
音響信号発生器１から出たティジタル信号Ｉ （ｎｌは
、音場補正フィルタ２（伝達関数Ａ （ｎ．ｌ ）を通
り、Ｄ ．／ Ａ変換器３でアナログ信号に変換され，
増幅器４で増幅された後、スピーカ５から（伝達関数Ｈ
（ｎｌ）音響信号として受聴点に達する。The digital signal I (nl) output from the acoustic signal generator 1 passes through the sound field correction filter 2 (transfer function A (n.l), and is converted into an analog signal by the D./A converter 3.
After being amplified by the amplifier 4, from the speaker 5 (transfer function H
(nl) Reaches the listening point as an acoustic signal.
従って受聴点での信号は、
Ｈ（ｎｌＡ（ｎｌＩ（ｎｌ＝Ｈ（ｎｌＫ（ｎ）／Ｈ（ｎ
ｌ Ｈ Ｉ（ｎ）＝ Ｋ （ｎｉ Ｉ （ｎｌ
となり、所望の音場Ｋ （ｎｌ Ｉ （ｎｌを得ること
ができる。Therefore, the signal at the listening point is H(nlA(nlI(nl=H(nlK(n)/H(n
l H I(n)=K (ni I (nl), and the desired sound field K (nl I (nl) can be obtained.
このように上記実施例によれば、音場補正フィルタの周
波数特性の急激なピークが平滑化され、それ以、外の所
では平滑化されないため、聴感的に９ヘ−ン
目然な音声を再生出来るという効果を有する。In this way, according to the above embodiment, the sharp peaks in the frequency characteristics of the sound field correction filter are smoothed, and other areas are not smoothed. It has the effect of being reproducible.
第２図は本発明の他の実施例の要部であるフィルタ係数
算出手段のブロック図である。この実施例では、ピーク
補正フィルタ６３は、フィルタ特性Ａ （ｎ）のピーク
の補正ではなく，スピーカのおかれた音場の伝達特性Ｈ
（ｎ）のディソプの補正、あるいは所望の伝達関数Ｋ
（ｎｉのピークの補正を、第１の実施例と同様に行う。FIG. 2 is a block diagram of filter coefficient calculating means, which is a main part of another embodiment of the present invention. In this embodiment, the peak correction filter 63 does not correct the peak of the filter characteristic A (n), but the transmission characteristic H of the sound field in which the speaker is placed.
Disop correction of (n) or desired transfer function K
(The peak of ni is corrected in the same way as in the first embodiment.
フィルタ特性Ａ （ｎ．ｌは、フィルタ特性算出千段６
２において、Ｈ（ｎ）とＫ（ｎｌより計算される。した
がって，この実施例でも、第１の実施例と同様の効果を
有する。Filter characteristic A (n.l is filter characteristic calculation stage 6
2, it is calculated from H(n) and K(nl. Therefore, this embodiment also has the same effect as the first embodiment.
発明の効果
本発明は上記実施例よシ明らかなように，ピーク補正フ
ィルタを設けて音場補正フィルタの伝達特性における急
激なピークだけを平滑化するようにしたものであシ、し
たがって聴惑的によシ自然な音を聴取者に提供できると
いう効果を有する。Effects of the Invention As is clear from the above embodiments, the present invention provides a peak correction filter to smooth only the sharp peaks in the transfer characteristics of the sound field correction filter. This has the effect of providing a more natural sound to the listener.
第１図は本発明の一実施例における音場補正装置のプロ
ノク図、第２図は本発明の他の実施例に１０−＼一／
おける同装置の要部ブロソクス、第３図は従来の音場補
正装置のブロック図である。
１・・・音響信号発生器、２・・・音場補正フィルタ、
３・・Ｄ／Ａ変換器、４・・・宿幅器、５・・スピーカ
、６・・・フィルタ係数算出手段、６１・・・ＦＦＴ、
６２・・・フィルタ特性算出器、６３・・・ピーク補正
フィルタ、６４・・・逆ＦＦＴ０
代理人の氏名 弁理士 粟 野 重 孝 ほか１名一７
７１−FIG. 1 is a block diagram of a sound field correction device according to an embodiment of the present invention, FIG. 2 is a block diagram of the main part of the same device according to another embodiment of the present invention, and FIG. 3 is a diagram of a conventional sound field correction device. FIG. 2 is a block diagram of a sound field correction device. 1... Acoustic signal generator, 2... Sound field correction filter,
3...D/A converter, 4...Buffer device, 5...Speaker, 6...Filter coefficient calculation means, 61...FFT,
62...Filter characteristic calculator, 63...Peak correction filter, 64...Inverse FFT0 Name of agent Patent attorney Shigetaka Awano and 1 other person17
71-
Claims (2)
よび第二のＦＦＴと、前記第一および第二のＦＦＴの出
力の比を計算する計算手段と、前記計算手段の出力にお
ける急激なピークの値を平滑するピーク補正手段と、前
記ピーク補正手段の出力を逆フーリエ変換する逆ＦＦＴ
とを備えた、フィルタ係数算出手段と、前記算出手段に
より算出された係数を設定したディジタルフィルタによ
り、ディジタル音源からの入力信号を補正して出力する
音場補正フィルタと、前記音場補正フィルタの出力をＡ
／Ｄ変換し、増幅してスピーカから音を出す手段とを備
えた音場補正装置。(1) first and second FFTs that Fourier transform each impulse response signal; calculation means for calculating the ratio of the outputs of the first and second FFTs; and a value of a sudden peak in the output of the calculation means. and an inverse FFT that performs inverse Fourier transform on the output of the peak correction means.
a sound field correction filter that corrects and outputs an input signal from a digital sound source using a digital filter to which the coefficients calculated by the calculation means are set; output A
/D conversion, amplification, and outputting sound from a speaker.
をフーリエ変換する第一および第二のＦＦＴと、前記第
一および第二の各ＦＦＴ出力のピーク補正をする第一、
第二のピーク補正手段と、前記第一と第二のピーク補正
出力の比を計算する計算手段と、前記計算手段の出力を
逆フーリエ変換する逆ＦＦＴとから構成されることを特
徴とする請求項（１）記載の音場補正装置。(2) The filter coefficient calculating means includes first and second FFTs that perform Fourier transform on each impulse response signal, and a first and second FFT that performs peak correction on each of the first and second FFT outputs.
A claim characterized in that it is comprised of a second peak correction means, a calculation means for calculating the ratio of the first and second peak correction outputs, and an inverse FFT that performs inverse Fourier transform on the output of the calculation means. The sound field correction device according to item (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1058363A JPH07112320B2 (en) | 1989-03-10 | 1989-03-10 | Sound field correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1058363A JPH07112320B2 (en) | 1989-03-10 | 1989-03-10 | Sound field correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02237400A true JPH02237400A (en) | 1990-09-19 |
| JPH07112320B2 JPH07112320B2 (en) | 1995-11-29 |
Family
ID=13082234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1058363A Expired - Lifetime JPH07112320B2 (en) | 1989-03-10 | 1989-03-10 | Sound field correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112320B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06178397A (en) * | 1992-11-30 | 1994-06-24 | Victor Co Of Japan Ltd | Method for controlling sound image localization |
| US5404406A (en) * | 1992-11-30 | 1995-04-04 | Victor Company Of Japan, Ltd. | Method for controlling localization of sound image |
-
1989
- 1989-03-10 JP JP1058363A patent/JPH07112320B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06178397A (en) * | 1992-11-30 | 1994-06-24 | Victor Co Of Japan Ltd | Method for controlling sound image localization |
| US5404406A (en) * | 1992-11-30 | 1995-04-04 | Victor Company Of Japan, Ltd. | Method for controlling localization of sound image |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07112320B2 (en) | 1995-11-29 |
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