JP2509009B2 - Reverberation device coefficient setting method - Google Patents
Reverberation device coefficient setting methodInfo
- Publication number
- JP2509009B2 JP2509009B2 JP3086856A JP8685691A JP2509009B2 JP 2509009 B2 JP2509009 B2 JP 2509009B2 JP 3086856 A JP3086856 A JP 3086856A JP 8685691 A JP8685691 A JP 8685691A JP 2509009 B2 JP2509009 B2 JP 2509009B2
- Authority
- JP
- Japan
- Prior art keywords
- delay
- comb filter
- tap
- reverberation
- frequency
- 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.)
- Expired - Fee Related
Links
Landscapes
- Electrophonic Musical Instruments (AREA)
- Stereophonic System (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は音楽信号等に人工的に残
響を付加する音場制御装置に関する。特に発明では多く
の残響音のバリエーションを作る作業を容易にするべく
コムフィルタの遅延時間設定の簡易化を目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field control device for artificially adding reverberation to a music signal or the like. In particular, the invention aims to simplify the delay time setting of the comb filter in order to facilitate the work of creating many variations of reverberation.
【０００２】[0002]
【従来の技術】図４は従来の音場制御装置を示す図であ
る。本図の音場制御装置はＤＳＰ(Digital Signal Proc
essor)で構成され、各音楽会場例えばコンサートホー
ル、ライブハウス、教会、スタジアム等の拡がり感を再
現するもので、一定のサンプリング周期の入力信号を前
処理する初期遅延メモリ10と、初期遅延メモリ10からの
出力データを順次取り込む遅延メモリ20−１、該遅延メ
モリ20−１の各タップから取り出された遅延データの振
幅を調整する乗算器20−２および各乗算器20−２からの
出力データを合成する加算器20−３からなる非再帰形デ
ィジタルフィルタ(FIR) で形成される初期反射音生成部
20と、初期遅延メモリ10からの出力データを所定時間遅
延する遅延器30−１、該遅延器30−１の出力のゲインを
調整する乗算器30−２と、該乗算器30−２の出力データ
と、および該遅延器30−１の入力データを加算する加算
器30−３とからなる再帰形ディジタルコムフィルタ(II
R) で形成される残響付加装置30と、該残響付加装置30
および前記初期反射音生成部20の出力データを合成する
加算器40とを含む。2. Description of the Related Art FIG. 4 is a diagram showing a conventional sound field control device. The sound field control device in this figure is a DSP (Digital Signal Proc
essor), which reproduces the sense of expanse of each music venue such as a concert hall, live house, church, stadium, etc., an initial delay memory 10 for pre-processing an input signal with a fixed sampling period, and an initial delay memory 10 Output data from each of the multipliers 20-2 and 20-2 for adjusting the amplitude of the delay data extracted from each tap of the delay memory 20-1 Early reflection sound generator formed by non-recursive digital filter (FIR) consisting of adder 20-3 for synthesis
20, a delay unit 30-1 for delaying the output data from the initial delay memory 10 for a predetermined time, a multiplier 30-2 for adjusting the gain of the output of the delay unit 30-1, and an output of the multiplier 30-2. A recursive digital comb filter consisting of data and an adder 30-3 for adding the input data of the delay unit 30-1 (II
R) and the reverberation adding device 30
And an adder 40 that synthesizes the output data of the initial reflected sound generation unit 20.
【０００３】図５は音場制御装置で形成される初期反射
音および残響音を示す図である。本図に示すように音源
から真直ぐにリスナーの席に到来する直接音に対して初
期遅延メモリ10によりＴ1 時間遅延され、初期反射音生
成部20によって壁、天井、床などに反射して直接音より
も道のりが長いだけ時間的に遅れて到来する初期反射音
が形成され、初期遅延メモリ10により直接よりもＴ2 時
間遅延され、さらに何回を反射を繰り返し四方八方から
ランダムに到来し遅れ方もまちまちでレベルも次第に減
衰するというパターンをもった一連の残響音が形成され
る。FIG. 5 is a diagram showing an initial reflected sound and a reverberant sound formed by the sound field control device. As shown in this figure, the direct sound coming from the sound source straight to the listener's seat is delayed by T 1 time by the initial delay memory 10, and is reflected by the initial reflected sound generation unit 20 on the wall, ceiling, floor, etc. The initial reflection sound that arrives after a longer time than the sound arrives with a delay in time is formed, and the initial delay memory 10 delays it by T 2 time more than directly, and repeats the reflection many times and randomly arrives from all sides and delays. A series of reverberant sounds is formed with a pattern in which the level varies gradually and the level gradually decreases.
【０００４】図６は残響付加装置の周波数特性を説明す
る図である。通常使用されるサンプリング周波数はｆs
＝48KHz 等であり、可聴周波数の最大値 20KHzの２〜３
倍（例えば32KHZ, 44.1KHZ）を採用する。残響付加装置
30の遅延器30−１には例えばシフトレジスタ、ＲＡＭ等
が用いられ、シフトレジスタであれば遅延データは出力
タップから取り出され、出力タップの選択により遅延時
間が定まる。ＲＡＭの場合であればメモリアドレスを介
して遅延時間が調整される。例えば上記シフトレジスタ
による遅延器30−１のタップＴａｐをＴａｐ＝１として
遅延時間Ｔを１サンプリング周期（Ｚ-1) だけ遅延する
と、ＩＩＲフィルタ30は本図（ａ）に示すような周波数
特性を示す。この場合、乗算器30−２のゲインをｇとす
ると、周波数０，ｆs で振幅最大値は１／（１−ｇ）
に、周波数ｆs ／２で振幅最小値は１／（１＋ｇ）であ
る。本図（ｂ）に示すように、Ｔａｐ＝２すなわち２サ
ンプリング周期（Ｚ-2) だけ遅延すると周波数ｆs ／２
に基準振動ピークが現れ、Ｔａｐ＝３にすると周波数ｆ
s ／３の点に基準振動ピークが現われ、さらにＴａｐ＝
４にすると周波数ｆs ／４の点に基準ピークが現われ
る。一般的にタップＴａｐ＝Ｄに増加すれば上記と同様
にして基準振動のピークがｆs ／Ｄに現われる。FIG. 6 is a diagram for explaining the frequency characteristic of the reverberation adding device. The sampling frequency normally used is f s
= 48 KHz, etc., and the maximum audible frequency is 20 KHz, 2-3
Double (eg 32KH Z , 44.1KH Z ) is adopted. Reverberation device
For example, a shift register, a RAM, or the like is used for the delay unit 30-1 of 30. In the case of the shift register, the delay data is extracted from the output tap, and the delay time is determined by the selection of the output tap. In the case of RAM, the delay time is adjusted via the memory address. For example, when the tap Tap of the delay unit 30-1 by the shift register is set to Tap = 1 and the delay time T is delayed by one sampling period (Z −1 ), the IIR filter 30 has a frequency characteristic as shown in FIG. Show. In this case, assuming that the gain of the multiplier 30-2 is g, the maximum amplitude value is 1 / (1-g) at frequencies 0 and f s.
In addition, the minimum amplitude value is 1 / (1 + g) at the frequency f s / 2. As shown in this figure (b), when Tap = 2, that is, when delayed by two sampling periods (Z −2 ), the frequency f s / 2
A reference vibration peak appears at, and when Tap = 3, the frequency f
A reference vibration peak appears at the point of s / 3, and further, Tap =
When set to 4, a reference peak appears at the point of frequency f s / 4. Generally, if the tap Tap is increased to D = D, the peak of the reference vibration appears at f s / D in the same manner as above.
【０００５】遅延器30−１のタップ位置は、再現すべき
コンサートホール、ライブハウス、教会、スタジアム等
の特性によって設定される。図６の特性のように、コム
フィルタ30はタップ位置が設定されるとピークを有する
ので、通常複数段に設けられ、タップ位置を少しづつず
らし、その合成周波数特性が出来るだけ平坦になるよう
にしている。The tap position of the delay device 30-1 is set according to the characteristics of the concert hall, live house, church, stadium, etc. to be reproduced. As shown in the characteristic of FIG. 6, the comb filter 30 has a peak when the tap position is set. Therefore, the comb filter 30 is usually provided in a plurality of stages, and the tap positions are slightly shifted so that the combined frequency characteristic is as flat as possible. ing.
【０００６】[0006]
【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、複数段のコムフィルタの遅延器30−１
のタップ位置の調整では、調整が失敗すると、却って、
各段のピーク位置がかたまったり重なり合ったりして、
聴感上好ましくなくなるという問題があった。よってこ
の調整すなわちコムフィルタの各段の遅延時間設定では
カット＆トライで聴感にたよりながら１段毎に設定し又
はＦＦＴ(Fast Fourier Transformation)等を用い、個
々にタップ位置を調整しなければならず、コムフィルタ
の周波数特性上のピークを聴感上取り除く調整作業が煩
雑であり、多くの残響音のバリエーションを作るのが大
変な作業になるという問題があった。さらに例えばコン
サートホールの音場からライブハウスの音場への切り換
えには、それぞれの機器について調整データを作成し
て、格納しておかなければならなかった。However, in the conventional reverberation adding device, the delay unit 30-1 of the multi-stage comb filter is used.
When adjusting the tap position of, if the adjustment fails,
The peak position of each stage is hardened or overlapped,
There was a problem that it was not preferable in terms of hearing. Therefore, in this adjustment, that is, in the delay time setting of each stage of the comb filter, it is necessary to adjust the tap position individually by setting each stage or by using FFT (Fast Fourier Transformation) or the like while depending on the sense of hearing by cut & try. However, there is a problem that the adjustment work for removing the peak on the frequency characteristic of the comb filter from the viewpoint of hearing is complicated, and it is a difficult work to make many variations of the reverberation sound. Further, for example, in order to switch from the sound field of a concert hall to the sound field of a live house, adjustment data had to be created and stored for each device.
【０００７】したがって、本発明は上記問題点に鑑みて
残響付加装置の遅延器の遅延時間を簡易に設定できる残
響付加装置の係数設定方法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 coefficient setting method for a reverberation adding device which can easily set the delay time of the delay device of the reverberation adding device.
【０００８】第１図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、ｎ段並列接
続されたコムフィルタを有する残響付加装置において、
前記各コムフィルタを構成するｋ番目の遅延器の遅延時
間をＴ k ＝Ｔ 1 ／２ (k-1)/n に設定し、各コムフィルタの
基準振動ピークが生じる周波数を対数軸で均一間隔にす
る。 FIG. 1 is a diagram showing the principle configuration of the present invention. In order to solve the above problems, the present invention provides a reverberation adding device having comb filters connected in parallel in n stages,
At the time of delay of the k-th delay device that constitutes each comb filter
Between set T k = T 1/2 ( k-1) / n, for each comb filter
Make the frequencies at which the standard vibration peaks occur uniform on the logarithmic axis.
It
【０００９】[0009]
【作用】第１図における残響付加装置の係数設定方法に
よれば前記各コムフィルタの各遅延器への遅延時間は上
記式によって与えられるのでその設定が容易になる。各
コムフィルタの基準振動ピークが生じる周波数を対数軸
上で均一間隔にしているので、それらを合成した周波数
特性は平坦化する。またコムフィルタの段数につき多い
方が平坦化を得るのによいが本発明によれば各遅延時間
を冪数の関係に設定し、聴感上オクターブ的間隔をとっ
ているので周波数特性の平坦化を簡単且つ効果的に実現
することができる。According to the coefficient setting method of the reverberation adding apparatus shown in FIG. 1, the delay time of each comb filter to each delay device is given by the above equation, so that the setting is facilitated. Since the frequencies at which the standard vibration peaks of the comb filters occur are made uniform on the logarithmic axis, the frequency characteristics obtained by combining them are flat. Further, it is better for the number of stages of the comb filter to obtain a flattening, but according to the present invention, each delay time is set to a power relation, and octave-like intervals are set in terms of hearing, so that the frequency characteristic is flattened. It can be realized easily and effectively.
【００１０】[0010]
【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
の係数設定方法を説明する図である。本図に示すように
説明の簡略化のため、４つのコムフィルタの並列接続に
ついて説明する。残響付加装置30第１〜第４のコムフィ
ルタ30，31，32および33として遅延器30−１，31−１，
32−１および33−１と、乗算器30−２と31−２，32−２
および32−３、加算器30−３，31−３，32−３および32
−４、各遅延器30−１，31−１，32−１および33−１の
出力を合成する加算器34と、各遅延器30−１，31−１，
32−１および33−１にＴk ＝Ｔ1 ／２(k-1)/4(ｋ＝１〜
４）の遅延時間設定を制御する制御部35とを含む。Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram illustrating a coefficient setting method of the reverberation adding apparatus according to the embodiment of the present invention. As shown in this figure, for simplification of description, parallel connection of four comb filters will be described. Reverberation adding device 30 Delay devices 30-1, 31-1, as first to fourth comb filters 30, 31, 32 and 33,
32-1 and 33-1 and multipliers 30-2 and 31-2, 32-2
And 32-3, adders 30-3, 31-3, 32-3 and 32
-4, an adder 34 that combines the outputs of the delay units 30-1, 31-1, 32-1 and 33-1 and the delay units 30-1, 31-1,
To 32-1 and 33-1 T k = T 1/2 (k-1) / 4 (k = 1~
4) The control unit 35 for controlling the delay time setting is included.
【００１１】遅延器30−１の遅延時間Ｔ1 は音楽会場が
特定されると決定されるので例えばこれを40msとする。
サンプリング周波数ｆs ＝48KHz とすると、タップ数Ta
p1＝48KHz×40ms＝1920になる。次に遅延器31−１の遅
延時間Ｔ2 は、Ｔ2 ＝Ｔ1 ／２1/4 ＝40ms／２1/4 ＝3
3.6msとして求まる。このときタップ数Tap2＝48KHz ×3
3.6ms＝1613になる。さらに遅延器32−１の遅延時間Ｔ
3 は、Ｔ3 ＝Ｔ1 ／２2/ 4 ＝40ms／２2/4 ＝28.3msとし
て求まる。このときタップ数Tap3＝48KHz ×28.3ms＝13
58になる。また遅延器33−１の遅延時間Ｔ4 は、Ｔ4 ＝
Ｔ1 ／２3/4 ＝40ms／２3/4 ＝23.8msとして求まる。こ
のときタップ数Tap4＝48KHz ×23.8ms＝1142になる。The delay time T 1 of the delay device 30-1 is determined to be 40 ms since it is determined that the music venue is specified.
If the sampling frequency f s = 48KHz, tap number Ta
It becomes p1 = 48KHz × 40ms = 1920. Then the delay time T 2 of the delay unit 31-1, T 2 = T 1/2 1/4 = 40ms / 2 1/4 = 3
Calculated as 3.6ms. At this time, tap number Tap2 = 48KHz × 3
3.6ms = 1613. Further, the delay time T of the delay device 32-1
3 is obtained as T 3 = T 1/2 2 /4 = 40ms / 2 2/4 = 28.3ms. At this time, the number of taps Tap3 = 48KHz × 28.3ms = 13
58. The delay time T 4 of the delay device 33-1 is T 4 =
T 1/2 3/4 = determined as 40ms / 2 3/4 = 23.8ms. At this time, the number of taps Tap4 = 48KHz × 23.8ms = 1142.
【００１２】図３は各コムフィルタの基準振動のピーク
周波数の位置を示す図である。本図に示すように第１の
コムフィルタ30の基準振動のピーク周波数は１／40ms＝
25Hzであり、第２のコムフィルタ31のものは１／33.6ms
＝30Hzであり、第３のコムフィルタ32のものは１／28.3
ms＝35Hzであり、第４のコムフィルタ33のものは１／2
3.8ms＝42Hzである。FIG. 3 is a diagram showing the position of the peak frequency of the reference vibration of each comb filter. As shown in this figure, the peak frequency of the reference vibration of the first comb filter 30 is 1/40 ms =
25Hz, 1 / 33.6ms for the second comb filter 31
= 30 Hz, and that of the third comb filter 32 is 1 / 28.3
ms = 35 Hz, the fourth comb filter 33 has 1/2
3.8ms = 42Hz.
【００１３】ここで図中30′のピークは、参考までに第
１のコムフィルタ30の第１次高調波のピーク周波数（50
Hz) である。以上は４つのコムフィルタを使用した場合
の説明であるが、一般的には複数の並列接続のコムフィ
ルタに対しては、ｋ番目のコムフィルタの遅延時間Ｔk
につきＴk ＝Ｔ1 ／２(k-1)/n として設定する。このと
きのタップ位置はTapk＝ｆs×Ｔk ＝Ｔ1 ×ｆs ／２
(k-1)/n となる。さらに基準振動のピーク周波数はｆk
＝１／Ｔk ＝２(k-1)/n ／Ｔ1 である。For reference, the peak 30 'in the figure is the peak frequency (50%) of the first harmonic of the first comb filter 30.
Hz). The above is a description of the case where four comb filters are used. However, in general, for a plurality of comb filters connected in parallel, the delay time T k of the k-th comb filter is used.
T k = T 1/2 ( k-1) is set as / n per. Tap position at this time is Tapk = f s × T k = T 1 × f s / 2
(k-1) / n . Furthermore, the peak frequency of the reference vibration is f k
= 1 / T k = 2 ( k-1) is a / n / T 1.
【００１４】このようにして得られた各コムフィルタの
基準振動のピーク周波数は対数軸上で均一間隔になり、
また理論的にもオクターブ的にも同様に均一間隔にな
り、ピークが重なりにくく、聴感上、上記間隔は周期性
による「くせ」を現れにくくしている。従って最小のコ
ムフィルタ段数で周波数特性の平坦化を達成できる。こ
の場合、図２の乗算器30−２，31−２，32−２および32
−３の乗算係数はそれぞれ任意のｇ1 ，ｇ2 ，ｇ3 およ
びｇ4 であってもよい。The peak frequencies of the standard vibrations of the comb filters thus obtained are evenly spaced on the logarithmic axis,
Similarly, theoretically and octavely, the intervals are similarly uniform, and the peaks are less likely to overlap, and the intervals make it difficult for the "habit" to appear due to the periodicity. Therefore, frequency characteristics can be flattened with a minimum number of comb filter stages. In this case, the multipliers 30-2, 31-2, 32-2 and 32 of FIG.
The multiplication factors of -3 may be arbitrary g 1 , g 2 , g 3 and g 4 , respectively.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によればｎ
段並列接続されたコムフィルタを構成するｋ番目の遅延
器の遅延時間をＴk ＝Ｔ1 ／２(k-1)/n に設定するよう
にしたので、各コムフィルタの基準振動ピークが生じる
周波数を対数軸で均一間隔にでき、周波数特性の平坦化
が簡易にでき、多くの残響音のバリエーションを作る作
業を容易にすることができる。As described above, according to the present invention, n
Since so as to set the delay time of the k-th delay unit constituting the stages connected in parallel comb filter T k = T 1/2 ( k-1) / n, the reference vibration peaks of each comb filter occurs The frequencies can be evenly spaced along the logarithmic axis, the frequency characteristics can be easily flattened, and the work of creating many reverberation variations can be facilitated.
【図１】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】本発明の実施例に係る残響付加装置の係数設定
方法を説明する図である。FIG. 2 is a diagram illustrating a coefficient setting method of the reverberation adding apparatus according to the embodiment of the present invention.
【図３】各コムフィルタの基準振動のピーク周波数の位
置を示す図である。FIG. 3 is a diagram showing a position of a peak frequency of a reference vibration of each comb filter.
【図４】従来の音場制御装置を示す図である。FIG. 4 is a diagram showing a conventional sound field control device.
【図５】音場制御装置で形成される初期反射音および残
響音を示す図である。FIG. 5 is a diagram showing an initial reflected sound and a reverberant sound formed by the sound field control device.
【図６】残響付加装置の周波数特性を説明する図であ
る。FIG. 6 is a diagram illustrating frequency characteristics of a reverberation adding device.
30−１，31−１，32−１，33−１…遅延器 30−２，31−２，32−２，33−２…乗算器 30−３，31−３，32−３，33−３…加算器 34…加算器 35…制御部 30-1, 31-1, 32-1, 33-1 ... Delay device 30-2, 31-2, 32-2, 33-2 ... Multiplier 30-3, 31-3, 32-3, 33- 3 ... Adder 34 ... Adder 35 ... Control unit
Claims (1)
る残響付加装置において、前記各コムフィルタを構成するｋ番目の遅延器の遅延時
間をＴ k ＝Ｔ 1 ／２ (k-1)/n に設定し、各コムフィルタの
基準振動ピークが生じる周波数を対数軸で均一間隔にす
ることを特徴とする残響付加装置の係数設定方法。 1. A reverberation adding device having comb filters connected in parallel in n stages, wherein a delay time of a k-th delay device constituting each comb filter is delayed.
Between set T k = T 1/2 ( k-1) / n, for each comb filter
Make the frequencies at which the standard vibration peaks occur uniform on the logarithmic axis.
A coefficient setting method for a reverberation adding device, comprising:
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3086856A JP2509009B2 (en) | 1991-04-18 | 1991-04-18 | Reverberation device coefficient setting method |
| US07/865,201 US5247474A (en) | 1991-04-18 | 1992-04-08 | Coefficients setting method of a reverberation unit |
| EP92303349A EP0509767B1 (en) | 1991-04-18 | 1992-04-14 | Coefficients setting method of a reverberation unit |
| EP97118205A EP0827276B1 (en) | 1991-04-18 | 1992-04-14 | Coefficients setting method for comb filters |
| DE69227273T DE69227273T2 (en) | 1991-04-18 | 1992-04-14 | Method for determining the coefficient of a reverberation unit |
| DE69231193T DE69231193T2 (en) | 1991-04-18 | 1992-04-14 | Coefficient determination method for comb filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3086856A JP2509009B2 (en) | 1991-04-18 | 1991-04-18 | Reverberation device coefficient setting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05265476A JPH05265476A (en) | 1993-10-15 |
| JP2509009B2 true JP2509009B2 (en) | 1996-06-19 |
Family
ID=13898459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3086856A Expired - Fee Related JP2509009B2 (en) | 1991-04-18 | 1991-04-18 | Reverberation device coefficient setting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2509009B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019166075A1 (en) * | 2018-02-27 | 2019-09-06 | Harman Becker Automotive Systems Gmbh | Feedforward active noise control |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551195A (en) * | 1978-10-09 | 1980-04-14 | Tabuchi Seisakusho Kk | Reinforcing method of branched port in softy pipe |
-
1991
- 1991-04-18 JP JP3086856A patent/JP2509009B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551195A (en) * | 1978-10-09 | 1980-04-14 | Tabuchi Seisakusho Kk | Reinforcing method of branched port in softy pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05265476A (en) | 1993-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6091824A (en) | Reduced-memory early reflection and reverberation simulator and method | |
| US4215242A (en) | Reverberation system | |
| JPH05265477A (en) | Sound field correcting device | |
| US5835895A (en) | Infinite impulse response filter for 3D sound with tap delay line initialization | |
| US6782105B1 (en) | Reflection sound generator with series of main and supplementary FIR filters | |
| JPH0157880B2 (en) | ||
| JP2509009B2 (en) | Reverberation device coefficient setting method | |
| JPH03220912A (en) | Signal switching circuit | |
| EP0509767B1 (en) | Coefficients setting method of a reverberation unit | |
| JP2003263179A (en) | Reverberator, method of reverberation, program, and recording medium | |
| JP2003263178A (en) | Reverberator, method of reverberation, program, and recording medium | |
| JP2953851B2 (en) | Reverberation device | |
| JPH05165485A (en) | Reverberation adding device | |
| JPH079593B2 (en) | Reverberation device coefficient setting method | |
| Kubinec et al. | Reverberator's late reflections parameters calculation | |
| JP3317984B2 (en) | microphone | |
| JPH053000B2 (en) | ||
| JP2591111Y2 (en) | Variable sound field playback device | |
| JP3371424B2 (en) | Resonant sound adding device | |
| JP3206770B2 (en) | Music generator | |
| JP3821417B2 (en) | Reverberation equipment | |
| JP4263869B2 (en) | Reverberation imparting device, reverberation imparting method, program, and recording medium | |
| JP3472643B2 (en) | Interpolator | |
| KR100228393B1 (en) | Adding apparatus of echo sound for audio | |
| JPH0728482A (en) | Acoustic effect control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960206 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080416 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090416 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090416 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100416 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110416 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |