JPH05143089A - Reverberation addition device - Google Patents

Reverberation addition device

Info

Publication number
JPH05143089A
JPH05143089A JP3306274A JP30627491A JPH05143089A JP H05143089 A JPH05143089 A JP H05143089A JP 3306274 A JP3306274 A JP 3306274A JP 30627491 A JP30627491 A JP 30627491A JP H05143089 A JPH05143089 A JP H05143089A
Authority
JP
Japan
Prior art keywords
multipliers
reverberation
delayed
delay
sound
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.)
Withdrawn
Application number
JP3306274A
Other languages
Japanese (ja)
Inventor
Hiroshi Kowaki
宏 小脇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Ten Ltd
Original Assignee
Denso Ten Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP3306274A priority Critical patent/JPH05143089A/en
Publication of JPH05143089A publication Critical patent/JPH05143089A/en
Withdrawn legal-status Critical Current

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  • Stereophonic System (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

PURPOSE:To simplify the constitution of the reverberation addition device which produces the presence and expansion feeling in a music hall. CONSTITUTION:The reverberation addition device is constituted by connecting plural stages of reverberation adding means 10-m which delay digital signals, multiply the delayed signal by a coefficient and adjust the amplitudes, and add and output the amplitude-adjusted signals and this device generates a reverberation sound. At least one of the reverberation adding means 10-1, 10-2...10-n is provided with plural 1st multipliers 2-m which multiply the digital signals delayed through delay units 1-m by a specific time by the coefficient and plural 2nd multipliers 6-1, 6-2...6-n which multiply the digital signals one sampling period delayed behind specific time; and the outputs of those 1st multipliers 2-m and the outputs of the 2nd multipliers 6-1, 6-2...6-n are added.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は音楽会場の臨場感や拡が
り感を、一般家庭の室内や車室内などにおいて疑似的に
得る残響付加装置に関する。特に、本発明では該残響付
加装置の構成を簡単化することを目的とする。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation adding device for simulating the feeling of presence and expanse of a music venue in a room of a general household or in a vehicle. In particular, the present invention aims to simplify the configuration of the reverberation adding device.

【0002】[0002]

【従来の技術】図4は従来の残響付加装置を示す図であ
る。該残響付加装置は、入力デイジィタル信号を任意時
間遅延する遅延器100と、該遅延器100で遅延され
た信号に残響音を得るために係数を乗算する乗算器群2
00−1、200−2及び200−3と、各該乗算器群
200−1、200−2及び200−3の複数の乗算器
の信号を加算する加算器300−1、300−2及び3
00−3と、各該加算器300−1、300−2及び3
00−3の出力にそれぞれ接続されるイコライザー40
0−1、400−2及び400−3と、該イコライザー
400−1、400−2及び400−3の出力信号を加
算する加算器500とを含み、非巡回型をなす。該残響
付加装置によれば、該遅延器100で遅延された信号に
対して残響音の初段、中段、後段毎に該乗算器群200
−1、200−2及び200−3、該加算器300−
1、300−2及び300−3で残響音が形成され、残
響音の初段、中段、後段毎に該イコライザー400−
1、400−2及び400−3で信号が所望の特性に補
正される。該イコライザー400−1、400−2及び
400−3では、例えば、実音場での残響周波数特性に
近似させる様にイコライザーを設定することによってよ
り自然な残響音に近い音にすることができる。この補正
演算処理及び音楽会場の臨場感を正確に再現するための
乗算器における乗算のための演算処理はDSP(デジィ
タル・シグナル・プロセッサー)により行われる。この
ため該乗算器群200−1、200−2及び200−
3、該イコライザー400−1、400−2及び400
−3は該DSPの演算容量を決定する。
2. Description of the Related Art FIG. 4 is a diagram showing a conventional reverberation applying apparatus. The reverberation adding apparatus includes a delay unit 100 that delays an input digital signal by an arbitrary time, and a multiplier group 2 that multiplies the signal delayed by the delay unit 100 by a coefficient to obtain a reverberation sound.
00-1, 200-2, and 200-3, and adders 300-1, 300-2, and 3 that add the signals of the multipliers 200-1, 200-2, and 200-3.
00-3 and the adders 300-1, 300-2 and 3
Equalizer 40 connected to each output of 00-3
0-1, 400-2, and 400-3 and an adder 500 that adds the output signals of the equalizers 400-1, 400-2, and 400-3 are included to form an acyclic type. According to the reverberation adding device, the multiplier group 200 is provided for each of the first stage, the middle stage, and the latter stage of the reverberation sound with respect to the signal delayed by the delay device 100.
-1, 200-2 and 200-3, the adder 300-
1, 300-2 and 300-3 form reverberant sound, and the equalizer 400-
At 1, 400-2 and 400-3, the signal is corrected to the desired characteristic. In the equalizers 400-1, 400-2, and 400-3, for example, by setting the equalizer so as to approximate the reverberation frequency characteristic in the actual sound field, it is possible to make the sound closer to a natural reverberation sound. The correction calculation process and the calculation process for multiplication in the multiplier for accurately reproducing the realism of the music venue are performed by a DSP (digital signal processor). Therefore, the multiplier groups 200-1, 200-2 and 200-
3, the equalizers 400-1, 400-2 and 400
-3 determines the computing capacity of the DSP.

【0003】[0003]

【発明が解決しようとする課題】しかしながら従来の残
響付加装置では、上記イコライザー400−1、400
−2及び400−3の演算ステップ数が多いために、該
DSPの容量に制限され、上記乗算器群200−1、2
00−2及び200−3を構成する乗算器を多くでき
ず、複雑な残響を形成しょうとするとDSPの容量不足
が問題となっていた。新たにDSPの容量を単に増加す
るとコスト高になるという別の問題が生じる。
However, in the conventional reverberation adding device, the above equalizers 400-1 and 400 are used.
-2 and 400-3 have a large number of operation steps, the capacity of the DSP is limited, and the multiplier groups 200-1, 2
Since it was not possible to increase the number of multipliers that make up 00-2 and 200-3 and attempted to form complex reverberation, insufficient capacity of the DSP was a problem. Another problem is that simply increasing the capacity of the DSP will increase the cost.

【0004】したがって本発明は上記問題点に鑑みて乗
算器の数を増加せずに残響特性を向上できる残響付加装
置を提供することを目的とする。
Therefore, in view of the above problems, it is an object of the present invention to provide a reverberation adding device capable of improving reverberation characteristics without increasing the number of multipliers.

【0005】[0005]

【課題を解決するための手段】図1は本発明の原理構成
を示す図である。本発明は前記問題点を解決するため
に、ディジタル信号を遅延して、それぞれ遅延された信
号に係数をかけて振幅を調整し、これらの振幅を調整さ
れた信号を加算して出力する残響付加手段(10−m)
を複数段直列に接続して残響音を形成する残響付加装置
において、前記残響付加手段(10−1、10−2、
…、10−n)の少なくとも一つには、遅延器(1−
m)によりそれぞれ所定時間遅延されたディジタル信号
に係数をかける第1の複数の乗算器(2−m)と、該各
所定時間に対して1サンプリング周期遅らせたディジタ
ル信号に係数をかける第2の複数の乗算器(6−1、6
−2、…、6−n)とが設けられ、これら第1の複数の
乗算器(2−m)出力と第2の複数の乗算器(6−1、
6−2、…、6−n)の出力とが加算されて出力される
ようにする。
FIG. 1 is a diagram showing the principle configuration of the present invention. In order to solve the above problems, the present invention delays a digital signal, multiplies each delayed signal by a coefficient to adjust the amplitude, and adds the amplitude-adjusted signals for output. Means (10-m)
A plurality of stages connected in series to form a reverberation sound, the reverberation adding means (10-1, 10-2,
At least one of 10-n) has a delay device (1-
m) a first plurality of multipliers (2-m) for multiplying the digital signals each delayed by a predetermined time, and a second multiplier (2-m) for multiplying the digital signals delayed by one sampling period for each predetermined time. Multiple multipliers (6-1, 6
-2, ..., 6-n) are provided, and the outputs of the first plurality of multipliers (2-m) and the second plurality of multipliers (6-1, 6-n) are provided.
6-2, ..., 6-n) are added and output.

【0006】[0006]

【作用】図1における残響付加装置によるれば、遅延器
1−m、乗算器2−m及び加算器からなる残響付加手段
10−mを複数段直列に設けたので、残響音の密度が同
じ場合従来に比べて残響音を形成するめの乗算器を大幅
に削減でき、すなわちDSPの掛け算処理を削減できる
ことになる。さらに前記複数段の残響付加手段10−m
の少なくとも一つは複数の乗算器2−nとは別にそれぞ
れに対して1サンプリング周期遅らせたディジタル信号
に係数をかける乗算器6−1、6−2、…、6−nを設
けて低域通過フィルタ又は高域通過フィルタを構成する
ことにより、残響音形成時に遅延がされるにしたがって
高周波成分又は低域成分の遮断を簡単な構成でおこなえ
るようになった。
According to the reverberation adding apparatus shown in FIG. 1, since the reverberation adding means 10-m including the delay unit 1-m, the multiplier 2-m and the adder are provided in a plurality of stages in series, the reverberation sound density is the same. In this case, it is possible to significantly reduce the number of multipliers for forming reverberant sound, that is, it is possible to reduce the DSP multiplication process, as compared with the conventional case. Further, the plurality of stages of reverberation adding means 10-m
At least one of the plurality of multipliers 2-n is provided with multipliers 6-1, 6-2, ..., 6-n for multiplying a digital signal delayed by one sampling period for each of them and providing a low frequency band. By configuring the pass filter or the high pass filter, it becomes possible to cut off the high frequency component or the low pass component with a simple configuration as the delay occurs when the reverberation sound is formed.

【0007】[0007]

【実施例】以下本発明の実施例について図面を参照して
説明する。図2は本発明の実施例に係る残響付加装置を
示す図である。本図に示すように、該残響付加装置は、
デジィタル信号を遅延する第1の遅延器1と、該第1の
遅延器1の時間t01、t02、…、t05の遅延毎の
タップに接続される乗算器21−1、21−2、…、2
1−6とからなる複数の乗算器2−1を含む。該乗算器
21−1、21−2、…、21−6の乗算係数は、例え
ばそれぞれ1.0、0.95、0.90、0.85、
0.80及び0.75に設定される。該残響付加装置
は、さらに該乗算器21−1、21−2、…、21−6
の出力を加算する加算器3と、該加算器3のデジィタル
信号を遅延する第2の遅延器1−2と、該第2の遅延器
1−2の時間T1、T2、T3及びT4毎の遅延タップ
に接続される乗算器22−1、22−2、…、22−5
からなる複数の乗算器2−2と、該乗算器22−1、2
2−2、…、22−5に対して1サンプリング周期t1
だけ遅延した該第2の遅延器1−2のタップに接続され
る乗算器6−1、6−2、…、6−5と、該乗算器22
−1、22−2、…、22−5及び該乗算器6−1、6
−2、…、6−5の出力信号を加算する加算器7とを含
む。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a reverberation applying apparatus according to an embodiment of the present invention. As shown in this figure, the reverberation adding device is
A first delay device 1 for delaying a digital signal, and multipliers 21-1, 21-2, ..., Which are connected to taps of the first delay device 1 at delays t01, t02 ,. Two
1-6 and a plurality of multipliers 2-1. The multiplication coefficients of the multipliers 21-1, 21-2, ..., 21-6 are, for example, 1.0, 0.95, 0.90, 0.85, respectively.
It is set to 0.80 and 0.75. The reverberation adding device further includes the multipliers 21-1, 21-2, ..., 21-6.
Of the output of the adder 3, a second delay device 1-2 for delaying the digital signal of the adder 3, and a time T1, T2, T3, and T4 of the second delay device 1-2. Multipliers 22-1, 22-2, ..., 22-5 connected to the delay taps
A plurality of multipliers 2-2, and the multipliers 22-1, 2
One sampling period t1 for 2-2, ..., 22-5
Multipliers 6-1, 6-2, ..., 6-5 connected to the taps of the second delay device 1-2 delayed only by
-1, 22-2, ..., 22-5 and the multipliers 6-1, 6
-2, ..., 6-5, and an adder 7 for adding the output signals.

【0008】上記遅延時間は例えばT1=6×t0、T
2=6.5×t0、T3=7.0×t0、T4=7.5
×t0を満たすように設定する。さらに、該乗算器22
−1、22−2、…、22−5の乗算係数はそれぞれ例
えば、0.9、0.7、0.5、0.35、0.2に設
定される。また該乗算器6−1、6−2、…、6−5の
乗算係数はそれぞれ例えば0.1、0.2、0.25、
0.3、0.2に設定される。
The delay time is, for example, T1 = 6 × t0, T
2 = 6.5 × t0, T3 = 7.0 × t0, T4 = 7.5
It is set to satisfy xt0. Further, the multiplier 22
The multiplication coefficients of -1, 22-2, ..., 22-5 are set to 0.9, 0.7, 0.5, 0.35, and 0.2, respectively. Further, the multiplication coefficients of the multipliers 6-1, 6-2, ..., 6-5 are, for example, 0.1, 0.2, 0.25,
It is set to 0.3 and 0.2.

【0009】図3は図2の残響付加装置のインパルスの
入力信号に対する出力信号の形成を示す図である。本図
(a)に示すように、該乗算器2−1、2−2、…、2
−6及び乗算器6−1、6−2、…、6−4によって形
成される出力信号は24個の残響音であり、この残響音
形成に必要な乗算器は10個であり、従来では乗算器を
24個必要としていたので、同一の残響音を形成するの
に乗算器の数を削減可能になった。本実施例では、該第
1の遅延器1と該第2の遅延器1−2の2段で構成した
が、乗算器の数が多い場合には該第1の遅延器1−1を
多段にすればさらに乗算器を削減できDSPの演算ステ
ップを削減できる。
FIG. 3 is a diagram showing formation of an output signal with respect to an input signal of impulse of the reverberation adding device of FIG. As shown in this figure (a), the multipliers 2-1, 2-2, ..., 2
The output signal formed by −6 and the multipliers 6-1, 6-2, ..., 6-4 is 24 reverberation sounds, and 10 multipliers are required to form this reverberation sound. Since 24 multipliers were required, it was possible to reduce the number of multipliers to form the same reverberation sound. In this embodiment, the first delay device 1 and the second delay device 1-2 are configured in two stages. However, when the number of multipliers is large, the first delay device 1-1 is configured in multiple stages. With this, the number of multipliers can be further reduced, and the number of DSP calculation steps can be reduced.

【0010】さらに、該乗算器22−1、22−2、
…、22−5の各遅延タップt01、t02、…、t0
5及びこれに接続する該第2の遅延器1−2の遅延タッ
プをT1、T2、T3及びT4のように少しづつずらし
ているので、出力される反射音の各遅延時間に周期性が
ないため信号処理において共鳴が生じるのを防止でき
る。本実施例は巡回型の回路の場合、例えばコムフィル
タと比較すると、該コムフィルタが共鳴を生じ易くいの
でこの点で有利になる。
Further, the multipliers 22-1, 22-2,
... 22-5 delay taps t01, t02, ..., t0
5 and the delay taps of the second delay device 1-2 connected thereto are slightly shifted like T1, T2, T3 and T4, so that there is no periodicity in each delay time of the reflected sound to be output. Therefore, resonance can be prevented from occurring in signal processing. In the case of a cyclic circuit, the present embodiment is advantageous in this respect because the comb filter is more likely to cause resonance, as compared with a comb filter, for example.

【0011】次に、該乗算器22−1、22−2、…、
22−5と該乗算器6−1、6−2、…、6−5との関
係を説明する。例えば該乗算器22−1及び該乗算器6
−1はディジタル・フィルタを形成し、下記式によりこ
のフィルタの振幅特性|A(ω)|が得られる。
Next, the multipliers 22-1, 22-2, ...
22-5 and the multipliers 6-1, 6-2, ..., 6-5 will be described. For example, the multiplier 22-1 and the multiplier 6
-1 forms a digital filter, and the amplitude characteristic | A (ω) | of this filter is obtained by the following equation.

【0012】[0012]

【数1】 [Equation 1]

【0013】上記式において、α、βがともに正の場合
には該ディジタル・フィルタは低域通過フィルタを形成
し、図3に示すように該乗算器6−1、6−2、…、6
−5の乗算係数βと該乗算器22−1、22−2、…、
22−5の乗算係数αの差が大きいときには高周波の信
号も通過するが、逆に小さくなると高周波の信号の通過
が少なくなり低周波の信号の通過が多くなる。このよう
にするのは、残響音は発生音から時間が経過するにつれ
て、高周波の信号が徐々に減少するので、これを模擬す
るためである。このように最終段の該乗算器22−1、
22−2、…、22−5に該乗算器22−1、22−
2、…、22−5を付加して残響音の周波数特性を改善
できる。したがって従来は図4のイコライザー400−
1、400−2及び400−3等でこのような信号処理
を行っていたが、簡単な構成で残響音の周波数特性の改
善が可能になるので該イコライザーの構成を簡単化で
き、負担軽減を図れる。
In the above equation, when both α and β are positive, the digital filter forms a low-pass filter, and the multipliers 6-1, 6-2, ..., 6 as shown in FIG.
-5 multiplication coefficient β and the multipliers 22-1, 22-2, ...
When the difference of the multiplication coefficient α of 22-5 is large, a high frequency signal also passes, but conversely when the difference is small, a high frequency signal passes less and a low frequency signal passes more. This is because the high-frequency signal of the reverberant sound gradually decreases as time elapses from the generated sound, and this is simulated. Thus, the multiplier 22-1, at the final stage,
22-2, ..., 22-5 to the multipliers 22-1, 22-
2, ..., 22-5 can be added to improve the frequency characteristic of the reverberation sound. Therefore, the equalizer 400 of FIG.
Although such signal processing was performed by 1, 400-2, 400-3, etc., since the frequency characteristic of reverberation sound can be improved with a simple structure, the structure of the equalizer can be simplified and the burden can be reduced. Can be achieved.

【0014】[0014]

【発明の効果】以上説明したように本発明によれば、遅
延器を複数段にしたんので、残響音を形成するめの乗算
器を大幅に削減でき、すなわちDSPの掛け算処理を削
減できることになる。後段の遅延器に接続される複数の
乗算器における隣接する乗算器の遅延時間間隔を少しづ
つずらすことにより、残響形成時に共鳴音の防止が可能
になる。また複数段の最終段の遅延器に接続される複数
の乗算器における各乗算器に対して1サンプリング周期
遅らした乗算器を設けて低域通過フィルタを構成するこ
とにより、残響音形成時に遅延がされるにしたがって高
周波成分の遮断を簡単な構成でおこなえるようになっ
た。
As described above, according to the present invention, since the delay device has a plurality of stages, the number of multipliers for forming reverberation can be greatly reduced, that is, the DSP multiplication process can be reduced. By slightly shifting the delay time intervals of the adjacent multipliers in the plurality of multipliers connected to the delay unit in the subsequent stage, it is possible to prevent resonance tones during reverberation. In addition, a multiplier that is delayed by one sampling period is provided for each multiplier in a plurality of multipliers connected to a final stage delay device of a plurality of stages to configure a low-pass filter. As a result, the high-frequency component can be cut off with a simple structure.

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

【図1】図1は本発明の原理構成を示す図である。FIG. 1 is a diagram showing a principle configuration of the present invention.

【図2】図2は本発明の実施例に係る残響付加装置を示
す図である。
FIG. 2 is a diagram showing a reverberation adding apparatus according to an embodiment of the present invention.

【図3】図3は図2の残響付加装置のインパルスの入力
信号に対する出力信号の形成を示す図である。
FIG. 3 is a diagram showing formation of an output signal with respect to an input signal of impulse of the reverberation applying apparatus of FIG.

【図4】図4は従来の残響付加装置を示す図である。FIG. 4 is a diagram showing a conventional reverberation adding apparatus.

【符号の説明】[Explanation of symbols]

1−1、1−2、…、1−n…遅延器 2−1、2−2、…、2−n…乗算器 6−1、6−2、…、6−n…乗算器 1-1, 1-2, ..., 1-n ... Delay device 2-1, 2-2, ..., 2-n ... Multiplier 6-1, 6-2, ..., 6-n ... Multiplier

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ディジタル信号を遅延して、それぞれ遅
延された信号に係数をかけて振幅を調整し、これらの振
幅を調整された信号を加算して出力する残響付加手段
(10−m)を複数段直列に接続して残響音を形成する
残響付加装置において、 前記残響付加手段(10−1、10−2、…、10−
n)の少なくとも一つには、遅延器(1−m)によりそ
れぞれ所定時間遅延されたディジタル信号に係数をかけ
る第1の複数の乗算器(2−m)と、 該各所定時間に対して1サンプリング周期遅らせたディ
ジタル信号に係数をかける第2の複数の乗算器(6−
1、6−2、…、6−n)とが設けられ、 これら第1の複数の乗算器(2−m)出力と第2の複数
の乗算器(6−1、6−2、…、6−n)の出力とが加
算されることを特徴とする残響付加装置。
1. A reverberation adding means (10-m) for delaying a digital signal, applying a coefficient to each delayed signal to adjust the amplitude, and adding these amplitude-adjusted signals for output. In a reverberation adding device for connecting a plurality of stages in series to form a reverberation sound, the reverberation adding means (10-1, 10-2, ..., 10-).
At least one of n) includes a first plurality of multipliers (2-m) for multiplying the digital signals delayed by the delay units (1-m) for a predetermined time respectively, and for each predetermined time. A second plurality of multipliers (6−) that apply a coefficient to the digital signal delayed by one sampling period.
, 6-2, ..., 6-n) are provided, and the outputs of the first plurality of multipliers (2-m) and the second plurality of multipliers (6-1, 6-2, ..., 6-n) and the output of 6-n) are added.
JP3306274A 1991-11-21 1991-11-21 Reverberation addition device Withdrawn JPH05143089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3306274A JPH05143089A (en) 1991-11-21 1991-11-21 Reverberation addition device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3306274A JPH05143089A (en) 1991-11-21 1991-11-21 Reverberation addition device

Publications (1)

Publication Number Publication Date
JPH05143089A true JPH05143089A (en) 1993-06-11

Family

ID=17955114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3306274A Withdrawn JPH05143089A (en) 1991-11-21 1991-11-21 Reverberation addition device

Country Status (1)

Country Link
JP (1) JPH05143089A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6782105B1 (en) 1998-11-25 2004-08-24 Yamaha Corporation Reflection sound generator with series of main and supplementary FIR filters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6782105B1 (en) 1998-11-25 2004-08-24 Yamaha Corporation Reflection sound generator with series of main and supplementary FIR filters

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