JP2005308946A - Reverberation adding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce an temporally irregular reflected sound pattern of a space an an object of sound field feeling simulation and a sound absorption characteristic and an air attenuation characteristic of a reflecting structure. <P>SOLUTION: A plurality of feedback signals which are adjusted to specified frequency characteristics are generated in a feedback processing part from a memory means to the input of a memory means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reverberation adding apparatus.

  2. Description of the Related Art Conventionally, there is a technique for adding a reverberation signal in order to obtain a feeling of sound expansion or realism when playing back content such as music and movies. In this case, since the reverberation signal is generated as a signal whose level is adjusted by delaying the acoustic signal included in the content for a predetermined time, it is necessary to secure a memory area according to the delay time. For example, when playing music content, if you want a sense of spread as if you are listening to music in a concert hall, based on the result of analyzing the reflection characteristics of the sound in the concert hall, the time during which the level is sufficiently attenuated (hereinafter, reverberation) A series of sounds up to (time) (hereinafter referred to as reflected sound) may be virtually reproduced by the reverberation signal generation method. However, depending on the concert hall, the reverberation time may be 1 second or more, and thus there is a problem that a huge memory area is required to generate the reverberation signal. An apparatus for solving such a problem has been proposed (see, for example, Patent Document 1). Hereinafter, a conventional reverberation adding apparatus will be described with reference to the drawings.

  FIG. 1 shows a conventional reverberation adding apparatus. In FIG. 1, 1 is an adder for inputting an input signal Sin, 2 is a delay memory for delaying the output signal of the adder 1 for each sampling period, and 3 is a plurality of signals from predetermined delay taps of the delay memory 2. A plurality of multipliers with variable gain input. However, the delay times of a plurality of input signals are different. Reference numeral 4 denotes an adder that adds and outputs the output signals of a plurality of variable multipliers 3. Reference numeral 5 denotes a gain variable multiplier for inputting a signal from an arbitrary delay tap of the delay memory 2, and an output signal of the variable multiplier 5 is input to the adder 1, that is, fed back to the input of the delay memory 2. As a result of the delay signal feedback processing, an infinite loop of the delay signal is formed, and as a result, a reverberation signal with a long delay time can be generated with a limited memory area and calculation cost. As the coefficient of the variable multiplier 5 is increased, the feedback signal gain is increased, so that the attenuation rate of the reverberation signal is decreased, and as a result, the reverberation time is increased. Further, since the gain changes every time the delayed signal group is fed back, the delayed signal group may cause a level difference between each other, but the coefficient of the variable multiplier 3 is appropriately set according to the coefficient of the variable multiplier 5. By changing the level difference, it becomes possible to avoid a level difference and smoothen the envelope of the reverberant sound. FIG. 2 shows a reverberation signal generated by the reverberation adding apparatus shown in FIG.

However, in the reverberation adding apparatus shown in FIG. 1, the same reverberation signal characteristics are obtained regardless of the frequency of the input signal Sin, and the air is attenuated when the reflected sound propagates in a concert hall or the like, or is reflected on the floor or wall. It is impossible to reproduce the attenuation due to sound absorption. In addition, the reflected sound that arrives at a certain position in a concert hall or the like has a lower level as time passes, but the number of arrivals increases. That is, as shown in FIG. 3, the reflected sound is sparse in time at the initial time, but the reflected sound is more dense in time as time passes. In the reverberation adding apparatus shown in FIG. 1, the gain of the reverberation signal can be changed by the variable multiplier 5, but the delay tap output from the delay memory 2 is not changed. . Thus, the reverberation adding apparatus shown in FIG. 1 cannot faithfully reproduce the reflected sound characteristics of a concert hall or the like.
Japanese Patent Laid-Open No. 5-232929

  In view of the above problems, the present invention provides a reverberation adding device that reproduces a temporally irregular reflection sound pattern and sound absorption characteristics and air attenuation characteristics of a reflective structure, which is a target for simulating a sense of sound field. With the goal.

  In order to solve the above-described problem, the present invention provides a reverberation adding device including a first adding unit that inputs an acoustic signal, a memory unit that sequentially delays an output signal of the first adding unit, Second adding means for inputting a signal delayed by a predetermined time by the memory means, first and second feedback signal correcting means for inputting an output signal of the second adding means, and the first feedback signal correcting means Output signal is input to the first adding means, the output signal of the second feedback signal correcting means is input to the second adding means, and each of the output signals is delayed by a predetermined time by the memory means. And at least one multiplying unit for inputting a signal, and a third adding unit for inputting an output signal of the multiplying unit, from an input of the first adding unit to an output of the third adding unit. Transfer function impal Peak column response has become a temporally structure heterogeneous.

  Further, the reverberation adding device of the present invention includes at least two first delay means for inputting an acoustic signal, memory means for sequentially delaying an output signal of the first adder means, and a delay time for each predetermined time by the memory means. At least two or more feedback signal correction means for inputting the above signals, a second addition means for inputting an output signal of the feedback signal correction means, and an output signal of the second addition means is the first signal. And at least one multiplying unit for inputting at least one signal input to the adding unit and delayed by a predetermined time by the memory unit, and a third adding unit for inputting an output signal of the multiplying unit. The peak sequence of the transfer function impulse response from the input of the first adding means to the output of the third adding means is nonuniform in time.

  The reverberation adding apparatus of the present invention further includes sampling frequency detecting means, and the sampling frequency detecting means has the characteristics of the first feedback signal correcting means according to the sampling frequency of the input signal to the first adding means. It is the structure characterized by adjusting.

  The reverberation adding apparatus according to the present invention further includes at least two reverberation adding apparatuses, and the output signal of the first feedback signal correcting means constituting the first reverberation adding apparatus further constitutes a second reverberation adding apparatus. Input to the first adding means, and the output signal of the first feedback signal correcting means constituting the second reverberation adding apparatus is further inputted to the first adding means constituting the first reverberation adding apparatus. It is the structure characterized by doing.

  The reverberation adding apparatus according to the present invention further includes at least two reverberation adding apparatuses, and the output signal of the second adding means constituting the first reverberation adding apparatus further constitutes the second reverberation adding apparatus. Input to the second adding means, and the output signal of the second adding means constituting the second reverberation adding apparatus is further inputted to the second adding means constituting the first reverberation adding apparatus. It becomes the composition which becomes.

  The reverberation adding apparatus according to the present invention further includes an input signal correcting means for inputting the output signal of the first adding means without sequentially delaying the output signal of the first adding means. The means sequentially delays the output signal of the input signal correction means.

  Further, the reverberation adding device of the present invention sequentially delays an output signal of the first adding means for inputting an acoustic signal, an input signal correcting means for inputting the output signal of the first adding means, and the input signal correcting means. Memory means, a feedback signal correcting means for inputting a signal delayed by a predetermined time by the memory means, and an output signal of the feedback signal correcting means is input to the first adding means, and each of the memory means delays by a predetermined time. At least one multiplication unit for inputting at least one signal, and a second addition unit for inputting an output signal of the multiplication unit. The second addition unit receives the second addition unit from the input of the first addition unit. Each peak component of the transfer function impulse response up to the output of the adding means has a predetermined frequency characteristic.

  The reverberation adding apparatus according to the present invention includes any one or combination of a multiplying unit that adjusts the input signal to a predetermined level, a frequency characteristic adjusting unit that adjusts the input signal to a predetermined frequency characteristic, and a delay unit. It is the structure characterized by becoming.

  As described above, according to the present invention, a plurality of feedback signals adjusted to a predetermined frequency characteristic are generated in the feedback processing unit from the memory means to the input of the memory means. From the above, it is possible to reproduce the temporally irregular reflected sound pattern, the sound absorption characteristic and the air attenuation characteristic of the reflecting structure, which is a target to simulate the sound field feeling.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 4 shows a reverberation adding apparatus according to the first embodiment. In FIG. 4, 6 is an adder for inputting a signal Sin such as music, and 7 is a delay having a maximum delay time nT (sampling frequency is 1 / T) for inputting the output signal of the adder 6 to generate a delay signal. A memory, 8 is an adder for inputting a delay signal of the maximum delay tap of the delay memory 7, and 9 is an adder 8 for imitating sound absorption characteristics of a concert hall floor or wall which is a sound field space to be attenuated or reproduced by sound waves. The first attenuation characteristic correction means 10 for processing the output signal of 10 corrects the output signal of the first attenuation characteristic correction means 9 with a predetermined gain so that the reverberation signal level generated by the feedback signal from the delay memory 7 is appropriately adjusted. 11 is a delay means for delaying the output signal of the adder 8 by a predetermined time mT, and 12 is a delay means 1 similar to the first attenuation characteristic correction means 9 to simulate air attenuation and sound absorption characteristics. The second attenuation characteristic correcting unit 13 processes the output signal of the second attenuation characteristic, and corrects the output signal of the second attenuation characteristic correcting unit 12 with a predetermined gain so that the reverberation signal level generated by the feedback signal from the adder 8 is appropriately adjusted. 14 is a multiplier for inputting delay signals of at least one predetermined delay tap of the delay memory 7, and 15 is an adder for adding output signals of the multipliers 14.

  Next, reverberation signal characteristics generated by the reverberation adding apparatus shown in FIG. 4 will be described. In FIG. 5, when the maximum delay tap signal of the delay memory 7 is not fed back, that is, when the gain of the multiplier 10 is zero, the time calendar response (impulse) of the output signal Sout when the input signal Sin is an impulse signal of magnitude 1. Response). However, five multipliers 14 are prepared and time d1 (delay tap d1 / T), d2 (delay tap d2 / T), d3 (delay tap d3 / T), d4 (delay tap d4 / T), respectively. , D5 (delay tap d5 / T) are input, and the gains are g1, g2, g3, g4, and g5, respectively. When the reflected sound of a concert hall or the like is reproduced by a reverberation adding device, the combination of the delay dn and the gain gn that determine the reverberation signal characteristics may be matched with the reflected sound pattern obtained by measurement or acoustic simulation. However, in reality, there are restrictions on the area of the delay memory 7 and the product-sum calculation cost in the multiplier 14, and only a few of the initial reflected sounds that are relatively sparse in time can be reproduced. Because it is not possible, it is difficult to obtain a sound field feeling in a concert hall.

  On the other hand, FIG. 6 shows an impulse response when the gain of the multiplier 10 is a and the maximum delay tap signal of the delay memory 7 is fed back and the gain of the multiplier 13 is zero. Here, a filter is designed in the first attenuation characteristic correcting means 9 so as to reproduce the air attenuation characteristic or the sound absorption characteristic of the wall and floor of the concert hall to be reproduced. FIG. 7 shows the attenuation rate of sound waves by air (1 / km). When sound waves travel in the air, in addition to distance attenuation (in the case of spherical waves, sound pressure is inversely proportional to distance), the level is attenuated by the characteristics shown in FIG. 7 due to air viscosity and heat conduction. This attenuation characteristic is more effective as the traveling distance of the sound wave is longer, that is, as the delay time of the reflected sound is larger. Therefore, if an inverse characteristic filter of the attenuation characteristic shown in FIG. 7 is set in advance in the first attenuation characteristic correction means 9, for example, the attenuation characteristic correction filter process is performed every time the maximum delay tap signal of the delay memory 7 is fed back. As shown in FIG. 8, the reflected sound group having a longer delay time can apply the attenuation characteristic. Of course, as the first attenuation characteristic correction means 9, not only air attenuation but also a reverse characteristic filter of sound absorption characteristics of concert hall walls and floors, an inverse characteristic filter of sound absorption characteristics, and an average characteristic of air attenuation are set. It is also possible to leave. The gain a of the multiplier 10 is set appropriately so as not to cause a level difference between the reflected sound groups in FIG. As described above, by adding the first feedback signal correction means including the multiplier 10 and the first attenuation characteristic correction means 9, as shown in FIG. 8, the reverberation time is limited even in a limited delay memory capacity. Not only can a long reverberation signal be generated, but a reverberation signal with characteristics such as air attenuation can be generated for a reflected sound having a longer delay time, but the problem remains that the temporal density of each reflected sound group is equal. Therefore, by providing a gain b to the multiplier 13 and forming a loop that further feeds back the feedback signal of the maximum delay tap signal of the delay memory 7, a feedback signal that is dense in time can be generated.

  FIG. 9 shows an impulse response of a feedback signal processing system in which a loop is constituted by the second feedback signal correction means comprising the delay means 11, the second attenuation characteristic correction means 12 and the multiplier 13. For the second attenuation characteristic correction means 12, if a reverse characteristic filter of air attenuation and wall sound absorption characteristics is designed in the same way as the first attenuation characteristic correction means 9, the reflected sound having a longer delay time is used for those characteristics. A reverberation signal can be generated. FIG. 10 shows the impulse response of the reverberation adding device shown in FIG. 4 when the first and second feedback signal correcting means are operated (gains other than zero are set in the multipliers 10 and 13). is there. Although the memory area required for generating the delay signal is only n taps of the delay memory 7 and m taps of the delay means 11, a reverberation signal having a long reverberation time can be generated and the delay time can be generated. The larger the value, the denser the reflected sound, and the frequency characteristics of the reflected sound can be added to reproduce the sound's air attenuation characteristics and the sound absorption characteristics when the sound reflects off the wall, etc. Close reverberation and sound field feeling can be obtained. The smaller the delay tap m of the delay means 11, the denser the reverberation signal generated by the second feedback signal correction means.

  In the configuration of FIG. 4, the reverberation envelope is determined by the gains of the multipliers 10, 13, and 14 and the number of taps of the delay signal input from the delay memory 7 to the multiplier 14. If the sampling frequency of the input signal Sin is different from the sampling frequency when these coefficients are designed, the delay time of the delay signal output from the delay memory 7 is different from the design time, and a desired reverberation envelope can be obtained. I can't. FIG. 11 shows reverberation at a sampling frequency when a coefficient is designed and reverberation at a sampling frequency higher than that at the time of designing the coefficient. Naturally, the higher the sampling frequency, the shorter the delay time per tap, so the inclination of the reverberation envelope also becomes steep and the reverberation time becomes shorter. FIG. 12 shows a reverberation adding apparatus that can keep the reverberation envelope constant regardless of the sampling frequency of the input signal Sin without largely replacing each coefficient for generating reverberation.

  FIG. 12 shows a configuration in which the multiplier 10 is replaced with a variable gain multiplier 17 and a sampling frequency detection means 16 is added compared to the configuration shown in FIG. Since the operations of the elements other than the variable multiplier 17 and the sampling frequency detection means 16 are the same as those shown in FIG. The sampling frequency detection means 16 changes the gain of the variable multiplier 17 according to the sampling frequency of the input signal Sin detected by some method, and changes the gain of the feedback signal component in reverberation. FIG. 13 is a diagram illustrating the gain setting value of the variable multiplier 17. When the signal Sin having the sampling frequency when the coefficient is designed is input, the reverberation envelope when the gain of the variable multiplier 17 is a is

  When the time when the reverberation signal disappears, that is, the delay time at the intersection of the envelope and the time axis is set as dr, the area of the portion surrounded by the envelope and the time axis is obtained as a measure of the size of the reverberation signal.

  It becomes. On the other hand, when a signal Sin having a sampling frequency different from that at the time of design, for example, a sampling frequency γ times that at the time of design, is input, the delay time of each signal constituting the reverberation becomes 1 / γ times and the envelope of the reverberation is Will change.

  Therefore, considering the area surrounded by the envelope and the time axis as a measure of the magnitude of the reverberation signal, in order to make the magnitude of the reverberation signal approximately equal regardless of the sampling frequency, the gain of the multiplier 17 such that the following equation holds: It is sufficient to set a · α.

  However, k in the equation represents the number of delay signal feedbacks from the delay memory 7 when the delay time of the envelope created by G ′ is approximately dr. In order to simplify the explanation, the reverberation signal generated by the second feedback signal correction means is not shown.

  In addition, although the reverberation adding apparatus shown in FIG. 4 adds reverberation to a one-channel input signal, it is also possible to add reverberation to a multi-channel input signal. FIG. 14 shows the configuration of a reverberation adding device for a two-channel input signal. In FIG. 14, the suffix “a” of the reference numerals of the constituent elements indicates an element for adding reverberation to the L channel signal, and the suffix “b” indicates an element for adding reverberation to the R channel signal. 7a, 7b, 8a, 8b, 14a, 14b, 15a, and 15b perform the same operation as the reverberation adding apparatus shown in FIG. Reference numerals 18a and 18b denote first feedback signal correction means, and 19a and 19b denote second feedback signal correction means. The adder 6a receives not only the feedback signal from the L channel delay memory 7a but also the feedback signal from the R channel delay memory 7b. Similarly, feedback signals from both the L channel delay memory 7a and the R channel delay memory 7b are input to the adder 6b. By adopting such a configuration, it becomes possible to make the reverberant sound richer by making the mutual delay signals denser than the configuration shown in FIG.

  It is not always necessary to output the signal of the maximum delay tap as a feedback signal from the delay memory 7 as in the reverberation adding device shown in FIG. As shown in FIG. 15, one delayed signal among the delayed signals input to the multiplier 14 may be branched and input to the adder 8.

  Note that the third attenuation characteristic correcting means 20 may be inserted between the adder 6 and the delay memory 7 as in the reverberation adding apparatus shown in FIG. In such a configuration, if the third attenuation characteristic correction means 20 is given a characteristic that imitates the sound attenuation characteristic of the floor or wall of the concert hall, which is the sound field space to be reproduced, or the sound field space to be reproduced, the reflected sound group in FIG. The above characteristics can be given to all reverberation signal components output from the adder 15 including A.

  When the delay signal is fed back from the delay memory 7 to the adder 6 as in the reverberation adding apparatus shown in FIG. 17, the feedback process including the second feedback signal correction unit and the process by the first feedback signal correction unit are performed. Alternatively, the third attenuation characteristic correcting means 20 may be inserted between the adder 6 and the delay memory 7 without performing the above. In such a configuration, if the third attenuation characteristic correcting means 20 is given a characteristic that imitates the sound attenuation characteristic of the concert hall floor or wall, which is the sound field space to be reproduced, or the sound field space to be reproduced, the reflected sound pattern over time. However, it is possible to give the above characteristics to all the reverberation signal components output from the adder 15 including the reflected sound group A in FIG. 8 with a relatively small amount of calculation.

(Embodiment 2)
FIG. 18 shows a reverberation adding apparatus according to the second embodiment. The reverberation adding apparatus shown in FIG. 18 has no second feedback signal correction means for the feedback signal from the delay tap of the delay memory 7 as compared with the configuration shown in FIG. Thus, the data is input to the adder 6. In FIG. 18, the delay memory 7, the multiplier 14 and the adder 15 operate in the same manner as the reverberation adding apparatus described in the first embodiment, and thus description thereof is omitted. The first attenuation characteristic correcting means 9 receives an n′-tap delay signal that is not the maximum delay among the delay taps of the delay memory 7. Similar to the first attenuation characteristic correction means 9 described in the first embodiment, the first attenuation characteristic correction means 9 is provided with a processing characteristic such as the air attenuation characteristic of sound waves or the inverse characteristic of the sound absorption characteristic of a floor or wall such as a concert hall. . The output signal of the first attenuation characteristic correcting means 9 is level-adjusted by the multiplier 10 and then input to the adder 8. On the other hand, the delay signal of the tap m ′ different from the delay tap of the signal input to the first attenuation characteristic correction unit 9 among the delay taps of the delay memory 7 is input to the second attenuation characteristic correction unit 12. Further, the second attenuation characteristic correction unit 12 gives the same processing characteristics as the first attenuation characteristic correction unit 9. The output signal of the second attenuation characteristic correcting unit 12 is level-adjusted by the multiplier 13 and then input to the adder 8. The adder 8 includes a first feedback signal correction unit including a first attenuation characteristic correction unit 9 and a multiplier 10 from the delay memory 7, and a second feedback signal correction unit including a second attenuation characteristic correction unit 12 and a multiplier 13. The feedback signals processed by the means are added, input to the adder 6 and added to the input signal Sin.

  The reflected sound group A, which is level-adjusted by the multiplier 14 without being fed back from the delay memory 7 and added and output by the adder 15, is processed and added once by the first feedback signal correcting means from the delay memory 7. The reflected sound group B that is fed back to the multiplier 6, level-adjusted by the multiplier 7, added by the adder 15 and output, and processed once by the second feedback signal correction means from the delay memory 7 and added by the adder 6. FIG. 19 shows the relationship on the time axis of the reflected sound group C that is fed back to the output signal, level-adjusted by the multiplier 14, added by the adder 15, and output. The first reflected sound gain of the reflected sound group A is g1, the gain of the multiplier 10 constituting the first feedback signal correcting means is a ', and the gain of the multiplier 13 constituting the second feedback signal correcting means is b'. Then, the first reflected sound gain of the reflected sound group B is represented by a ′ · g1, and the first reflected sound gain of the reflected sound group C is represented by b ′ · g1. As can be seen from FIG. 19, the reflected sound temporal density increases due to the reflected sound group B and the reflected sound group C, which are feedback signals, at a time equal to or greater than d1 + n′T. Although not shown in FIG. 19, since the delay signal feedback processing is always performed while the apparatus is operating, the reflected sound group increases as the delay time increases, so the temporal density of the reflected sound increases. .

  In the configuration shown in FIG. 18, the signal is fed back from two delay taps of the m ′ tap and the n ′ tap among the delay taps of the delay memory 7, but the signal is fed back from three or more delay taps. May be.

  As described above, the reverberation adding apparatus according to the present invention can be used for the purpose of obtaining reflected sound characteristics of a concert hall, a sound field feeling of a concert hall, and the like.

A diagram showing a conventional reverberation adding device The figure which shows the impulse response of the conventional reverberation addition apparatus Figure showing reflection sound pattern such as concert hall The figure which shows the reverberation addition apparatus in Embodiment 1 of this invention. The figure which shows the impulse response in case the 1st feedback signal correction | amendment means does not output a signal in Embodiment 1 of this invention. The figure which shows the impulse response when the 2nd feedback signal correction | amendment means does not output a signal in Embodiment 1 of this invention. Diagram showing attenuation rate of sound wave by air Diagram showing the relationship between feedback signal and number of attenuation characteristics processing The figure which shows the impulse response of the feedback signal processing system which consists of a 2nd feedback signal correction means Diagram showing impulse response Diagram showing the relationship between sampling frequency and reverberation envelope The figure which shows the reverberation addition apparatus in the case of changing the characteristic of a 1st feedback signal correction | amendment means according to input signal sampling frequency in Embodiment 1 of this invention. The figure explaining the variable multiplier gain setting according to the input signal sampling frequency The figure which shows the reverberation addition apparatus in the case of adding the reverberation of 2 channel signals each in Embodiment 1 of this invention. The figure which shows the reverberation adding apparatus in the case of returning the delay signal which implement | achieves an early reflection sound pattern in Embodiment 1 of this invention. The figure which shows the reverberation addition apparatus in the case of giving the frequency characteristic to all the reflected sounds in Embodiment 1 of this invention. The figure which shows the reverberation addition apparatus in the case of giving the frequency characteristic to all the reflected sounds with low computational complexity in Embodiment 1 of this invention. The figure which shows the reverberation addition apparatus in Embodiment 2 of this invention. Diagram showing reverberation envelope

Explanation of symbols

1, 4, 6, 6a, 6b, 8, 8a, 8b, 15, 15a, 15b Adder 2, 7, 7a, 7b Delay memory 3, 5 Variable multiplier 9 First attenuation characteristic correcting means 10, 13, 14 , 14a, 14b Multiplier 11 Delay means 12 Second attenuation characteristic correction means 16 Sampling frequency detection means 17 Variable multipliers 18a, 18b First feedback signal correction means 19a, 19b Second feedback signal correction means 20 Third attenuation characteristics Correction means

Claims (8)

First addition means for inputting an acoustic signal;
Memory means for sequentially delaying the output signal of the first adding means;
Second addition means for inputting a signal delayed by a predetermined time by the memory means;
First and second feedback signal correcting means for inputting an output signal of the second adding means;
The output signal of the first feedback signal correcting means is input to the first adding means,
The output signal of the second feedback signal correcting means is input to the second adding means,
At least one multiplication means for receiving at least one signal each delayed by a predetermined time by the memory means;
A third adding means for inputting an output signal of the multiplying means;
The reverberation adding apparatus according to claim 1, wherein a peak sequence of a transfer function impulse response from an input of the first adding means to an output of the third adding means is nonuniform in time. First addition means for inputting an acoustic signal;
Memory means for sequentially delaying the output signal of the first adding means;
At least two feedback signal correction means for inputting at least two signals respectively delayed by a predetermined time by the memory means;
Second addition means for inputting an output signal of the feedback signal correction means;
The output signal of the second adding means is input to the first adding means,
At least one multiplication means for receiving at least one signal each delayed by a predetermined time by the memory means;
A third adding means for inputting an output signal of the multiplying means;
The reverberation adding apparatus according to claim 1, wherein a peak sequence of a transfer function impulse response from an input of the first adding means to an output of the third adding means is nonuniform in time. A sampling frequency detection means;
3. The reverberation according to claim 1, wherein the sampling frequency detection means adjusts the characteristic of the first feedback signal correction means in accordance with a sampling frequency of an input signal to the first addition means. Additional equipment. Comprising at least two reverberation adding devices,
An output signal of the first feedback signal correcting means constituting the first reverberation adding device is further input to the first adding means constituting the second reverberation adding device;
2. The output signal of the first feedback signal correcting means constituting the second reverberation adding apparatus is further inputted to the first adding means constituting the first reverberation adding apparatus. Reverberation adding device. Comprising at least two reverberation adding devices,
The output signal of the second adding means constituting the first reverberation adding apparatus is further input to the second adding means constituting the second reverberation adding apparatus,
3. The reverberation addition according to claim 2, wherein the output signal of the second addition means constituting the second reverberation addition apparatus is further input to the second addition means constituting the first reverberation addition apparatus. apparatus. The memory means does not sequentially delay the output signal of the first adding means,
An input signal correcting means for inputting an output signal of the first adding means;
6. The reverberation adding apparatus according to claim 1, wherein the memory means sequentially delays the output signal of the input signal correcting means. First addition means for inputting an acoustic signal;
Input signal correcting means for inputting an output signal of the first adding means;
Memory means for sequentially delaying the output signal of the input signal correction means;
Feedback signal correcting means for inputting a signal delayed by a predetermined time by the memory means;
The output signal of the feedback signal correction means is input to the first addition means,
At least one multiplication means for receiving at least one signal each delayed by a predetermined time by the memory means;
Second addition means for inputting an output signal of the multiplication means;
A reverberation adding apparatus, wherein each peak component of a transfer function impulse response from an input of the first adding means to an output of the second adding means has a predetermined frequency characteristic. 2. The feedback signal correcting means comprises one or a combination of a multiplying means for adjusting an input signal to a predetermined level, a frequency characteristic adjusting means for adjusting the input signal to a predetermined frequency characteristic, and a delay means. The reverberation adding apparatus according to claim 7.

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