JP3084908B2 - Reverberation effect imparting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation effect imparting device used in electronic musical instruments or audio equipment, and more particularly to a device having improved applicability and controllability.

[0002]

2. Description of the Related Art An example of a conventional reverberation effect imparting apparatus is shown in FIG. 6, in which a delay line 1 delays an input electric sound signal (hereinafter simply referred to as a sound signal) and delays the signal to an arbitrary delay time. It produces a corresponding delayed output signal and is for simulating the early reflections. A plurality of delay feedback loops DFL1 to DFLn to which signals output from the delay lines are input in parallel are for simulating reverberation. One delay feedback loop DFL1 includes a delay line DL, a low-pass filter LPF that simulates loss of harmonic components,
It has a multiplier MU for simulating a regular level attenuation (loss) of a reverberation signal, and an adder (or subtractor) AD for feedback.

The delay time of each delay line, the filter coefficient and the loss calculation coefficient can be variably set, so that desired initial reflected sound and reverberant sound can be obtained. The example in the figure shows an example where a stereo reverberation effect can be added.
For simplicity, one system, for example, the left system, will be described. A delay output signal corresponding to a desired delay time is output from the delay line 1 in response to a plurality of initial reflected sounds (3 in the illustrated example). Then, the variable level control is performed by the multiplier MU1 and the addition is performed by the adder AD1, thereby obtaining a total initial reflected sound signal. Also, each delay feedback loop D
A delay output signal corresponding to a desired delay time is output from the delay lines DL1 to FLLn, and a variable level control is performed by a multiplier MU2, and they are added by an adder AD2 to obtain a total reverberation signal. The initial reflected sound signal and the reverberant sound signal output from the adders AD1 and AD2 are respectively multiplied by a multiplier MU.
3 and MU4 to control the variable level,
3 is added to the left system reverberation effect imparting signal Lou.
Output as t. The same applies to the right system. Signals are extracted from desired delay output positions of the delay lines 1 and DL, respectively, and after the same arithmetic processing, finally, the adder AD4
Is output as a right-system reverberation effect imparting signal Rout.

In the reverberation effect imparting apparatus as described above, since only a predetermined time delay set for each of the delay feedback loops DFL1 to DFLn is repeated, reverberation that attenuates while repeating linear reflection is repeated. It becomes a sound. Therefore, only a reverberation effect that repeats monotonous reflection in a rectangular parallelepiped room can be obtained. On the other hand, an actual sound wave is transmitted while spreading in space, and even when reflected on a wall, reflection occurs at various reflection angles with a certain spread. Also, it is unlikely that a hall or room set as a reverberation space is an accurate rectangular parallelepiped, and there is a path obstruction of sound waves by furniture or at least the body of an audience, and a diffraction phenomenon should also occur. However, with the above-described reverberation effect imparting device, since only a monotonous reverberation effect is obtained as described above, it is difficult and insufficient to simulate the above-described natural reverberation.

On the other hand, Japanese Patent Application Laid-Open No. 63-40199 discloses a signal processor using a waveguide network, and discloses a closed-type waveguide in which a physical reverberation mechanism in a natural acoustic space such as an acoustic room or a concert hall is used. A technique (waveguide reverberator) for imparting a reverberation effect by simulating with a network is disclosed. The waveguide reverberator shown therein adds the outputs of a plurality of waveguides (bidirectional signal transmission means including delay lines) provided in parallel, and distributes and inputs the addition result to the waveguides again. It constitutes a closed waveguide network. This makes it possible to simulate a complex reverberation such as a reflection with a spread or a repetition of reflection while circumventing by diffraction, and the above-described natural reverberation can be easily simulated.

[0006]

However, any of the above-mentioned prior arts is interesting because it aims at simulating reverberation in a static environment. For example, when a person moves in a room, the reverberation condition changes with the movement, and the reverberation sound should change. However, such a change cannot be realized by the conventional device. Also, it was impossible to provide an unexpected reverberation effect other than the reverberation conditions prepared in advance. The present invention has been made in view of the above-mentioned points, and realizes a reverberation effect imparting device that realizes time fluctuation of a reverberation effect that cannot be realized by a conventional device, expands applicability as an effect device, and enhances controllability. It is something to offer.

[0007]

Means for Solving the Problems] reverberation effect applying apparatus of the present invention, to facilities the signal delay on the input signal delay unit
A calculation unit for performing a predetermined calculation process on the output signal of the delay unit and
And outputs signals corresponding to the traveling wave and the reflected wave.
A plurality of bidirectional signal transmission means, each of which
The bidirectional signal transmission means outputs the output signal of the predetermined bidirectional signal transmission means.
Network means for inputting a signal, time-varying data generating means for generating time-varying time-varying data, and the plurality of bidirectional signals constituting the closed network means.
Of a plurality of reverberation setting parameters such as a delay time and a calculation coefficient for controlling the characteristics of each signal transmission means ,
Parameter selecting means for selecting the remaining
It is characterized in that it comprises a modulation means for varying the time the sound setting parameters according to the time variation data.

[0008]

The closed network means responds to the input signal.
And a delay unit that delays the signal by applying a predetermined delay to the output signal of the delay unit.
And a calculation unit for performing the calculation processing of
A plurality of bidirectional signal transmission means for outputting a signal corresponding to a wave
In each of the two-way signal transmission means,
Input the output signal of the fixed bidirectional signal transmission means.
ing. Each two-way signal that constitutes a closed network means
The characteristics of the signal transmission means are based on multiple
Controlled by reverberation setting parameters. Input message
The signal patrols through the closed network means, and
Control such as delay and calculation according to the fixed parameters
Thus, a reverberation effect is provided. The variation data generated when during variation data generating means, parameter selection Hand
In the stage, these reverberation setting parameters are changed over time
Choose one. The modulating means selects the selected reverberation setting parameter.
The parameter is modulated by the time-varying data and is fluctuated over time. As a result, the reverberation setting parameters can be time-varying in real time, and the time-varying control of the reverberation characteristics can be easily performed. For example, special reverberation effects such as when an object such as a person moves in an acoustic room,
In addition, it is possible to freely realize a reverberation effect that has not existed in the past, and even a special reverberation effect that does not exist in reality. Therefore, the applicability as the reverberation effect imparting device can be expanded, and the controllability can be enhanced by performing control that immediately reflects the free will of the operator.

The reverberation time-varying by the modulation means
According to the multiplication coefficient corresponding to the setting parameter,
Further comprising modulation control means for weighting the moving data
You may do so. This allows time-varying reverberation
Weighting of time variation characteristics corresponding to each constant parameter
Control can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram functionally showing an embodiment of a reverberation effect applying apparatus according to the present invention. The reverberation imparting network unit 10 includes, in a closed network, a delay unit that applies a variable delay time to a signal and outputs the signal, and an arithmetic unit that performs predetermined arithmetic processing on an output signal of the delay unit in a closed network. This is to provide a reverberation effect by introducing a tone signal TSin provided from a unit or from the outside into the closed network and circulating through the delay means.

The reverberation effect selector 11 is for selecting a desired reverberation effect from a plurality of types of reverberation effects. The reverberation setting parameter supply unit 12 generates reverberation setting parameters for realizing the reverberation effect selected by the reverberation effect selector 11, and includes, for example, a memory storing various reverberation setting parameters. The reverberation setting parameters include delay time setting data and various calculation coefficients for setting signal loss or signal mixing ratio. The reverberation setting parameter generated from the reverberation setting parameter supply unit 12 is provided to the reverberation imparting network unit 10 via the modulation operation unit 13. The control unit 14 generates change control data that changes in real time according to the operation of the operator. The modulation operation unit 13 performs an operation for changing the value of the reverberation setting parameter generated from the reverberation setting parameter supply unit 12 in real time according to the change control data. As a result, various reverberation setting parameters given to the reverberation imparting network unit 10 are temporally variably controlled, and the input tone signal TSi
The reverberation characteristic given to n is variably controlled over time.

FIG. 2 shows an example in which the reverberation imparting network unit 10 is constituted by a closed type waveguide network, that is, a waveguide reverberator WGR.
In FIG. 2, a tone signal TSin to which a reverberation effect is to be applied.
Is a delay line D for simulating the early reflections
It is input to La. The delay line DLa outputs a signal that has been subjected to a delay corresponding to a desired delay time in response to a plurality of initial reflected sounds (6 in the illustrated example). The delayed output signals corresponding to the respective initial reflected sound signals are each subjected to variable level control by the multiplier M10 and then added by the adder A10 to obtain a total initial reflected sound signal. In addition,
Each multiplier receives coefficient data for controlling the signal level from the reverberation setting parameter supply unit 12 to the modulation operation unit 1.
3, but the detailed illustration is omitted.

A plurality of waveguides WG1 to WG5 are provided in parallel. Wave guides WG1 to WG5
Is a bidirectional signal transmission means including a delay line, as will be shown in detail later. The outputs of these traveling wave signal lines are level-controlled by multipliers M11 to M15, respectively, and added by adder A11. . The output of the adder A11 is input to the reflected wave signal lines of each of the waveguides WG1 to WG5. And each of the waveguides WG1 to WG5
The output of the reflected wave signal line is level-controlled by multipliers M16 to M20, respectively, and added by adder A12. The output of the adder A12 is output from each of the waveguides WG1 to WG1.
It is input to the traveling wave signal line of WG5. Here, multipliers M11 to M1 provided on the output side of the traveling wave signal line
5 and the part of the adder A11 correspond to each of the waveguides WG1 to WG1.
It connects one end of the WG 5 and simulates signal scattering at the connection portion, and corresponds to a signal scattering junction. Similarly, the portions of the multipliers M16 to M20 and the adder A12 provided on the output side of the reflected wave signal line connect the other ends of the respective waveguides WG1 to WG5 and simulate signal scattering at the connection portion. Which corresponds to a signal scattering junction.

Thus, each of the waveguides WG1 to WG
G5 are interconnected via signal scattering junctions to form a closed waveguide network. The coefficients of the multipliers M11 to M20 are variably set to a value less than 1, and can simulate a loss given to a signal circulating through the closed waveguide network. The signal circulating in a complicated manner in the closed waveguide network is attenuated by a certain characteristic due to the loss, and the reverberation is simulated. In addition, the waveguides WG1 to WG5 not only perform signal delay but also exhibit resonance characteristics according to the delay time as is known from the theory of the acoustic tube model, and thus simulate more natural reverberation. It is possible to control complex reverberation.

The input tone signal TSin is extracted from an appropriate delay stage of the delay line for initial reflection DLa and introduced into the closed waveguide network at any point in the closed waveguide network. It circulates in the network in a complicated manner as described above, and a reverberation effect is provided. In the example shown in the figure, the tone signals given from the appropriate delay stages of the delay line DLa are individually level-controlled by multipliers M21 to M24, respectively, and the adder A1
At four points where A1, A12, A13, and A14 are arranged, they can be introduced into the network. The adder A13 is provided on the input side of the reflected wave signal line of the waveguide WG1, and the adder A14 is provided on the input side of the traveling wave signal line of the waveguide WG1.

The reverberated signal may be extracted from any point in the closed waveguide network. In the example of the figure, the outputs of the adders A11 and A12 at each junction are used as multipliers M25 and M2.
The level is controlled in step 6 to take out. The outputs of the multipliers M25 and M26 are added by the adder A15, and a total reverberation signal is obtained. The level of the initial reflected sound signal output from the adder A10 and the level of the reverberant sound signal output from the adder A15 are controlled by multipliers M27 and M28, respectively. Is output as a tone signal TSout of

Next, an example of the configuration of one waveguide WG1 will be described with reference to FIG. In FIG. 3, a waveguide WG1 includes a delay line for a traveling wave signal including a low-pass filter LPFf and a variable delay circuit DLf, and a delay line for a reflected wave signal including a low-pass filter LPFr and a variable delay circuit DLr. Is provided. Since both delay lines have the same configuration and differ only in the signal transmission direction, one of the delay lines for traveling wave signals will be described below.

The signal delay circuit DLf sequentially delays the input signal for each clock time according to the sampling clock pulse Ps, and variably controls the delay time according to the delay time setting data DL1 input as a reverberation setting parameter (that is, the input is delayed). (The number of delay clocks from output to output) can be variably controlled). That is, it can be considered that the signal given to the input WA1 is sequentially shifted according to the sampling clock pulse Ps, and the output extraction position RA1 is equivalent to a serial shift register variably controlled by the delay time setting data DL1. In this case, the signal delay circuit DLf cannot delay the sampling clock pulse Ps by less than one cycle.
On the other hand, the delay time setting data DL1 includes a fraction of less than one cycle of the sampling clock pulse Ps as a decimal part k in order to increase accuracy. Therefore, the signal delay circuit DLf determines the output extraction position RA1 according to the value of the integer part of the delay time setting data DL1, outputs the signal A to which the delay time corresponding to the value of the integer part has been applied, and And outputs a signal B to which a delay time longer than that by one sampling clock period is applied, and interpolates the two delayed output signals A and B according to the fraction of the delay time setting data DL1, that is, the value of the decimal part k. I am trying to do it.

That is, the two delayed output signals A and B extracted from the signal delay circuit DLf are respectively multiplied by the multiplier M2.
9, M30 and multiplied by the decimal part k of the delay time setting data DL1 as an interpolation coefficient, and the multiplication result and the delay output signal A are input to the adder / subtractor ADS1 to obtain "(1-k) A
+ KB ”is executed. Thereby, a highly accurate signal delay can be performed in accordance with the delay time setting data DL1 including a fraction of less than one cycle of the sampling clock pulse Ps. By such interpolation of the signal delay, the accuracy can be improved without increasing the system scale of the waveguide network, that is, without increasing the frequency of the delay clock. In particular,
In the case where the delay time setting data DL1 is modulated in real time by appropriate change control data, even if the delay time setting data DL1 is finely modulated at the level of a decimal part, signal delay can be accurately performed correspondingly and smooth. This is convenient.

The output of the adder / subtractor ADS1 is output as a traveling wave signal output from the waveguide WG1. The low-pass filter L inserted in the delay line
The PFf simulates a signal loss characteristic having an arbitrary frequency characteristic. This frequency characteristic can be controlled by a filter coefficient. Further, the traveling wave signal output from the adder / subtractor ADS1 is appropriately level-controlled by the multiplier M31, input to the adder (or subtractor) A17 provided on the delay line for the reflected wave, and added to the reflected wave signal ( Subtraction)
Is done. Similar multiplier M32 and adder (or subtractor) A
Reference numeral 18 is provided on the entrance side of the delay line for the traveling wave, and the reflected wave signal is appropriately level-controlled and added (subtracted) to the traveling wave signal.

Next, an example of the modulation operation section 13 and the control section 14 will be described with reference to FIG. The control unit 14 is configured to generate change control data based on the outputs of a plurality of controls and sensors, the output of a signal generator, and the like, according to the operator's will. As controls for generating the change control data, slide-type controls 20, wheel-type controls 21, pedal-type controls 22,
Other operators 23 can be used. Each of the operation elements 20 to 22 can change its operation position continuously or in a plurality of steps, and outputs change control data according to the current operation position. Further, change control data may be generated based on the outputs of the various sensors 24. As such sensors 24, for example, an aftertouch sensor that generates an aftertouch detection signal responsive to a key pressing force or a pressing depth at the time of continuous key pressing on a keyboard (not shown) can be used. In addition, a breath controller that detects an operator's breath pressure and generates a detection signal can be used. Note that these operators and sensors 20 to 24 are not actually provided with the apparatus, but are provided.
These externally provided controls and sensors 20 to 2
4 may be received.

As an example of a signal generator for generating change control data, a low frequency signal oscillator 25 is provided. The waveform selection unit 26 performs a selection operation for selecting a waveform (for example, a sine wave, a triangular wave, a sawtooth wave, a 1 / f fluctuation waveform, a random sample-hold waveform, etc.) of a low-frequency signal oscillated from the low-frequency signal oscillator 25. It includes children and the like. The frequency / amplitude setting unit 27 is the frequency and amplitude (depth of modulation) of the low-frequency signal oscillated from the low-frequency signal oscillator 25.
And the like for selecting and setting the same.
As a result, a low-frequency modulation signal controlled according to the selection / setting operation of the operator is generated.

The change control data output from the various operators 20 to 23, the sensors 24 and the low frequency signal oscillator 25 are input to the selector 28. Various controls 20-2
3, a data selection switch unit 29 is provided to allow the operator to freely select which of the sensors 24 and the low frequency signal oscillator 25 to use the change control data output from. . The selector 28 selects the change control data corresponding to the data selected by the data selection switch unit 29 from among the change control data provided from the various operators 20 to 23, the sensors 24, and the low frequency signal oscillator 25, and outputs the selected change control data. I do.

The change control data MOD output from the selector 28 is input to the distribution circuit 30. Distribution circuit 30
Is the change control data MOD given from the selector 28
With various reverberation setting parameters (each waveguide WG1-WG5) in the waveguide network WGN.
For each of the delay time setting data DL1 to DL5 and the operation coefficient). The parameter selection unit 31 is used by the operator to select one or a plurality of arbitrary parameters to be subjected to change control from various reverberation setting parameters. The distribution circuit 30 distributes the change control data in accordance with one or a plurality of parameters selected by the parameter selection unit 31. The change control data MOD distributed by the distribution circuit 30 is provided to the modulation operation unit 13.

FIG. 4 shows, as an example of the modulation operation section 13, a circuit portion for changing and controlling the delay time setting data DL1 to DL5 for each of the waveguides WG1 to WG5 by the change control data MOD. From the reverberation setting parameter supply unit 12, the reverberation effect selector 11
Waveguide WG corresponding to the reverberation effect selected in
The original values of the delay time setting data DL1 to DL5 for each of 1 to WG5 (referred to as offset values OA1 to OA5) are supplied to the adders A20 to A24, respectively. Further, the change width data a1 to a5 for setting the maximum change width for each of the delay time setting data DL1 to DL5 is supplied from the reverberation setting parameter supply unit 12 or formed inside the modulation operation unit 13. This variation width data a1
Ａa5 are input to multipliers M40 to M41, and are multiplied by the change control data MOD. This variation width data a1 to a5
Is an offset value OA1 corresponding to the change control data MOD.
This is for controlling the maximum change width of OA5 to OA5. For example, the maximum change width is set to about 10% of the offset values OA1 to OA5. In this case, if the offset value OA1 is "5", the corresponding change width data a1 is set to "0.5", and if the offset value OA2 is "17", the corresponding change width data a1 is set to "0.5". a2 is set to "0.17".

It is assumed that the change control data MOD is data including a decimal part which changes in a numerical range from +1 to -1. In the multipliers M40 to M41, the change control data M
OD is multiplied by the change width data a1 to a5, respectively,
The results of the multiplication are given to adders A20 to A24, respectively, and added to the offset values OA1 to OA5. Adder A
The outputs of 20 to A24 are the respective waveguides WG1 to WG5.
It is output as delay time setting data DL1 to DL5 for each. Accordingly, the delay time setting data DL1 to DL5 for each of the waveguides WG1 to WG5 is
The data changes in the range of the change width data a1 to a5 around A1 to OA5 according to the current value of the change control data MOD. That is, a change operation of DL1 = OA1 + MOD × a1 is performed.

The outputs of the multipliers M41 and M43 are inverted in sign by the inverters IN1 and IN2, and are output by the adder A2.
1, A23. This is because the phase of the parameter change control is made different between the respective waveguides WG1 to WG5 to make a change. The outputs of the multipliers M40, M42 and M44 are connected to the inverters IN3 and IN3.
The signals are input to the adders A25, A27, and A29 via the sign inversion operation by IN4 and IN5, and the offset value O
A1, OA3, and OA5 are added.
The outputs of the multipliers M41 and M43 are directly used as the adders A
26, A28, and offset values OA2, OA4
Is to be added. Each adder A25 to A2
The output of No. 9 is used as delay time setting data DL6 to DL10 for another five waveguides.

Each of the delay time setting data DL1 to DL5 and D
Comparing L6 to DL10, the offset value O
It can be understood that A1 to OA5 are common, but the phase of the parameter change control is inverted. For example, when the value of the change control data MOD is 1, the change width data a1 to a5 are set so that a deviation of about 10% occurs between the data DL1 to DL5 and DL6 to DL10. This is a process prepared in a case where two systems of the waveguide reverberators WGN are provided to realize a stereo reverberation effect. That is, one of the delay time setting data DL1 to DL
L5 is input to one waveguide reverberator WGN (for example, left channel), and the other delay time setting data DL6 to DL10 is input to the other waveguide reverberator WGN (for example, right channel). As a result, the reverberation setting parameter is, for example, 1
By shifting by 0%, different reverberation characteristics are given to the left and right channels. It is needless to say that not only the delay time setting data DL1 to DL5 but also other operation coefficients and the like can be temporally changed by the change control data MOD by the same configuration as described above. Further, the specific configuration of the modulation operation unit 13 is not limited to the example shown in FIG. 4 and may be appropriately designed.

FIG. 5 shows another embodiment of the reverberation imparting network 10, which has delay feedback loops DFL1 to DFLn similar to those shown in FIG. In this case, as described above, each of the delay feedback loops DFL1 to DFLn forms a loop, and can form only a relatively monotonous reverberation sound. However, by performing the time-varying control of the reverberation setting parameter according to the present invention, it is possible to expect to provide a reverberation sound that is less monotonous. In the example of FIG. 5, in a portion of each delay feedback loop DFL1 to DFLn in which the output of the delay line DL is fed back to the input side via the low-pass filter LPF, a delay output interpolation arithmetic circuit (multiplier M45) as shown in FIG. , M46, and an adder / subtractor ADS2) so that the delay time of a feedback loop for simulating repetitive reflection can be variably set with high accuracy by interpolation calculation. Then, the delay time setting data of the feedback loop is compared with the above-described FIG.
It is only necessary to change temporally by the change control data MOD with the same configuration as that described above. In FIG. 5, the delay output interpolation arithmetic circuit is provided at a portion where the output signals of the left and right channels are extracted from the delay line DL, and the delay time setting data is temporally converted by the change control data MOD by the same configuration as that of FIG. May be changed. Further, not only the delay time setting data but also other operation coefficients may be temporally changed by the change control data MOD with the same configuration as that of FIG. Further, other methods may be employed for delay interpolation. Further, the configuration of each waveguide may be the configuration shown in FIG. 3 which is further connected in series. Further, the delay time of the signal delay circuits DLf and DLr for propagation and reflection is made common in one waveguide, but they may be controlled so as to be different delay times.

Each of the illustrated embodiments is shown as a functional diagram, and a hardware circuit may be configured as in these functional diagrams, or may be configured by software processing by a microcomputer. Of course you can. The function of the signal delay line in the waveguide network can be realized by a random access memory, and various operations and signal processing in the waveguide network can be executed by a digital signal processor (DSP). Further, the reverberation effect imparting device of the present invention may be configured as a single reverberator that inputs an electric sound signal from the outside and imparts a reverberation effect thereto, or may be built in an electronic musical instrument or the like. Of course, it is good.

[0031]

As described above, according to the present invention, the closed
A plurality of bidirectional signal transmission means constituting network means
Multiple characteristics such as delay time and operation coefficient to control each characteristic
Of the reverberation setting parameters, those that fluctuate over time
Reverberation selected arbitrarily by the meter selection means
Since the setting parameters are modulated by the time-varying data, the reverberation setting parameters are modulation-controlled in real time, so that the time-varying control of complicated reverberation characteristics can be performed easily. So, for example , as if the shape of the space had changed
A reverberation effect and the acoustic room, such as special reverberation effect as in the case where an object such as a human moves, other conventional never been such reverberation effect, furthermore, even special reverberation effect that does not in reality, the free Will be realized. Therefore, while expanding its applicability as a reverberation effect imparting device,
An excellent effect is achieved in that controllability can be enhanced by performing control that immediately reflects the free will of the operator.

[Brief description of the drawings]

FIG. 1 is a block diagram functionally showing an embodiment of a reverberation effect applying apparatus according to the present invention.

FIG. 2 is a block diagram functionally showing an embodiment in which the reverberation imparting network unit in FIG. 1 is configured by a closed type waveguide network, that is, a waveguide reverberator.

FIG. 3 is a block diagram functionally showing a configuration example of one waveguide in FIG. 2;

FIG. 4 is a block diagram functionally showing a configuration example of a modulation operation unit and a control unit in FIG.

FIG. 5 is a block diagram showing another embodiment of the reverberation imparting network unit in FIG. 1;

FIG. 6 is a block diagram showing an example of a conventional reverberation effect applying apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Reverberation addition network part, 11 ... Reverberation effect selector, 12 ... Reverberation setting parameter supply part, 13 ... Modulation calculation part, 14 ... Control part, DLa ... Delay line for initial reflection, M10-M46 ... Multiplier, A10-A16 ... Adders, WG1 to WG5 ... Wave guides, DLf, DLr
... Variable delay circuits, LPFf, LPFr ... Low-pass filters, 20 ... Slide type operators, 21 ... Wheel type operators, 22 ... Pedal type operators, 25 ... Low frequency signal oscillators,
28 selector, 30 distribution circuit.

Claims (2)

(57) [Claims] 1. A slow to facilities the signal delay on the input signal
An operation for performing predetermined operation processing on output signals of the extension unit and the delay unit
Output signals corresponding to traveling waves and reflected waves.
And a plurality of bidirectional signal transmitting means,
In the bidirectional signal transmission means, the output of the predetermined bidirectional signal transmission means
Closed network means for inputting a force signal ; time-varying data generating means for generating time-varying time-varying data; and the plurality of bidirectional directions constituting the closed network means.
Of a plurality of reverberation setting parameters such as a delay time and a calculation coefficient for controlling the characteristics of each signal transmission unit , the time variation is performed.
Characterized by comprising a parameter selection means for selecting an object, and a modulation means for varying the time the reverberation setting parameter said selected according to the time variation data
Reverberation effect imparting apparatus according to. 2. A reverberation setting parameter which fluctuates with time by said modulating means.
According to the multiplication coefficient corresponding to the parameter,
Modulation modulation means for weighting the data.
The reverberation effect imparting device according to claim 1, wherein: