JPH09269775A - Reverberation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an initial reflection sound generator of a reverberation device capable of easily imparting respective frequency characteristics to initial reflection sounds for each delay with a simple circuit constitution in which outputs from respective delays of a multitap delay are combined with a small number of a filter and adders and multiplyers. SOLUTION: This reverberation device is constituted of a synthesizing means A(23a, 23b) synthesizing outputs controlled by control means provided every delay in order to control respective delayed signals generated by a delay means 12 generating plural delayed signals in accordance with elapsed times based on an original sound to output values in accordance with respective elapsed times and also to control the distribution ratio of outputs to be outputted to a direct system and a filter system every direct system and filter system, a filter means 24 adding frequency characteristics to outputs of the filter system by performing filterings to them, a synthesizing means B 31 synthesizing outputs of the direct system and the filter system, a rear part reverberation adding means 30 adding a rear part reverberation to the synthesized signal and a synthesizing means C32 synthesizing the signal to which the rear part reverberation is added and the original sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation device built in or connected to an electronic musical instrument, and particularly to the generation of an initial reflected sound capable of easily adding a frequency characteristic to a rising initial reflected sound with a simple structure. The present invention relates to a reverberation device equipped with a vessel.

[0002]

2. Description of the Related Art FIG. 7 is a diagram for explaining the configuration of a conventional reverberation device. As shown in the figure, the reverberation device of the conventional electronic musical instrument is
A part of the original sound is output with a multi-tap delay over each delay time, the output value is attenuated according to the delay time with each attenuator (multiplier), and this is added by an adder It was producing reflected sound.

However, in such a conventional method, although the output changes with the passage of time, since each delay sound is not filtered, a change in frequency characteristics other than a change due to phase interference is given. It was unnatural with little change over time.

On the other hand, in an actual live performance, for example, a frequency range characteristic of a high frequency range component changes as the number of reflections increases, so that a desirable sensation such as depth and spread of output sound and reverberation can be obtained. There is.

In order to solve such a problem, there is a method in which a filter is provided for each attenuator and filtering is performed for each output sound, but the number of required filters is enormous and the circuit scale becomes large, which is very expensive. It is not realistic.

There is also a method in which the outputs from the multi-tap delay are grouped, a filter is provided for each group, and the cutoff frequency of the filter is controlled, or a frequency characteristic is added by sliding the filter. In this case, it is necessary to control the cutoff frequency and the like for each filter, and the structure tends to be complicated.

Therefore, there has been a demand for an early reflection sound generator of a reverberation device which has a simple structure and can add the frequency characteristics of the initial reflection sound at low cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional reverberation apparatus, and outputs the output from each delay of the multi-tap delay,
An object of the present invention is to provide a reverberation device including an initial reflection sound generator that can easily give a frequency characteristic to the initial reflection sound for each delay with a simple circuit configuration in which a small number of filters and an adder and a multiplier are combined. And

[0009]

According to the present invention, a delay means 2 for generating a plurality of delay signals according to elapsed time based on an original sound.
1 and each delay signal generated by the delay means 21 is controlled to an output value according to each elapsed time, and the distribution ratio of the outputs output to the direct system and the filter system is controlled. Control means 22 provided in
And a synthesizing unit A23 for synthesizing the output controlled by the control unit 22 provided for each delay for each direct system and each filter system, and the filter system,
A filter means 24 for filtering the output of the filter system to add frequency characteristics, a combining means B31 for combining the outputs of the direct system and the filter system, and a rear reverberation to the signal combined by the combining means B31. Rear reverberation adding means 30 and the rear reverberation adding means 3
It is composed of a synthesizing means C32 for synthesizing the signal to which the rear reverberation is added by 0 and the original sound.

The filter used in the filter means 24 is a low-pass filter.

The filter used in the filter means 24 is a high-pass filter.

The filter used in the filter means 24 is a bandpass filter.

[0013]

The function of the early reflection sound generator 20 of the reverberation device 7 of the present invention
Controls a pair of attenuators 22a and 22b provided for each delay of the multi-tap delay 21, thereby controlling the distribution of outputs to the direct system and the filter system and the total output of each delay.

Thus, the frequency characteristic can be added to the output from each delay by filtering with a single filter or a small number of filters 24 provided for each group.

Therefore, the early reflection sound generator 20 of the present invention is used.
Is the output of each delay of the multi-tap delay 21, which has different delay times, is branched into a direct system and a filter system, and the total output value is set by the attenuators 22a and 22b in which the control values of the direct system and the filter system are preset. The distribution ratio is controlled and output, and the output signals are added and synthesized for each system by the adders 23a and 23b.

Next, the output of the filter system is controlled by a filter 24 provided in a single or a group set to a constant cutoff frequency, and a frequency characteristic according to the output of each delay is added. In addition,
The adder 31 adds the output of the direct system to generate the initial reflected sound.

The control values of the pair of attenuators 22a and 22b provided for each delay and the cutoff frequency of the filter 24 are set by the manufacturer at the time of manufacture so that optimum frequency characteristics can be obtained for each delay. Is set in advance.

As described above, according to the present invention, the balance of the outputs to the direct system and the filter system is controlled for each delay with a simple structure in which a very small number of filters, an adder and an attenuator (multiplier) are combined. By doing so, it is possible to control the frequency characteristics of the initial reflected sound of each delay, and it is possible to provide the initial reflected sound generator 20 capable of generating a natural initial reflected sound at a low price.

[0019]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a reverberation device 7 according to the present invention.
It is a block diagram showing a schematic structure of an electronic musical instrument provided with.
The configuration of an electronic musical instrument equipped with the reverberation device according to the present invention will be described below with reference to the drawings.

In the figure, 11 is a CPU, 12 is a ROM, and 13 is a RAM. Further, 1 is a keyboard, 2 is a key scan circuit, 3 is an operation panel, 4 is a panel scan circuit, 5 is a sound source, 6 is a waveform memory, 7 is a reverberator according to the present invention, 8 is a D / A converter, 9 Is an amplifier and 10 is a speaker.

The CPU 11 controls each section of the electronic musical instrument according to a control program stored in a program memory section (not shown) of the ROM 12.

The ROM 12 stores tone color data and various other fixed data in addition to the control program for operating the CPU 11 described above.

The RAM 13 is a work area for the CPU 11,
Various registers, counters, flags, buffers, and the like for controlling the electronic musical instrument are defined.
2 has a data area in which necessary data is transferred and temporarily stored.

Further, in the RAM 13, a plurality of registers in which data necessary for sound emission are set corresponding to the setting states of the switches of the operation panel 3 and the tone generation circuits of the tone generator 5 are assigned to unused channels. There is also provided an assigner memory for storing data for storing, a storage area for storing tone information, and the like.

The keyboard 1 uses the key number as the key depression information for the CPU.
11 is composed of a plurality of keys and a key switch that opens and closes in conjunction with the key pressing / key releasing operations of these keys.
The signal detected by the CPU 11 and supplied under the control of the CPU 11 is supplied to the sound source 5.

The key scan circuit 2 detects the key depression / key release operation of the player, that is, the on / off state of the key, and transmits the detected on / off state together with the key number to a sound generation channel assigning section (not shown). is there. The CPU 11 temporarily stores the detected key on / off information in a predetermined area of the RAM 13 and reads it out at a predetermined timing.

The operation panel 3 is used to set tone color selection information, edit parameter selection information, edit data write request information, and the like. The operation panel 3 includes a power switch, a tone color selection switch, Various switches and indicators such as a melody selection switch and a rhythm selection switch are provided.

The set / reset state of each switch of the operation panel 3 is detected by the panel scan circuit 4 included therein, and the data on the set state of the switch detected by the panel scan circuit 4 is stored in the CPU 11. It is stored in a predetermined area on the RAM 13 under control.

The tone generator 5 reads out musical tone waveform data and envelope data corresponding to the signal output from the CPU 11 from the waveform memory 6 and adds an envelope to the read musical tone waveform data to output it as a tone signal. A waveform memory 6 that stores waveform data and envelope data is connected to the sound source 5.

The reverberation device 7 adds a desired reverberation effect to the original sound generated by the sound source 5, and is an initial reflection sound generator 2
0, the rear reverberation generator 30 and the adders 31 and 32. The configuration and function of the reverberation device 7 will be described in detail with reference to FIGS.

The D / A converter 8 converts the input digital musical tone signal into an analog musical tone signal. The analog musical tone signal converted by the D / A converter 8 is supplied to the amplifier 9, amplified by a predetermined gain, and then amplified by the speaker 10.
Is supplied to.

The speaker 10 converts an analog musical tone signal as an electric signal sent from the amplifier 9 into an acoustic signal. That is, a tone is emitted according to the generated tone signal.

FIG. 2 shows an early reflection sound generator 20 according to the present invention.
It is a figure explaining the whole reverberation device 7 composition to which is applied.
As shown in the figure, the reverberation device 7 of the present invention is connected between the sound source 5 and the D / A converter 8 via an adder 32, and a part of the original sound generated by the sound source 5 is reverberated by the reverberation device 7. After being added, the tone is added to the original sound by the adder 32 to generate a musical sound to which the reverberation effect is added.

Further, the reverberation device 7 includes the early reflection sound generator 2
0 and the rear reverberation generator 30. First, after the initial reflection sound generator 20 generates the initial reflection sound, the rear reverberation generator 30 adds the rear reverberation to the initial reflection sound, and the adder 3
Sent to 2. Since the structure and function of the rear reverberation generator 30 are the same as those of the conventional technique, the description thereof is omitted.

The initial reflection sound generator 20 is composed of a multi-tap delay 21, an attenuator 22, a filter 24 and an adder 23. Based on the original sound sent from the sound source 5, the multi-tap delay 21 delays according to the passage of time. A signal is generated, and the generated delay signal is branched and sent to the direct attenuator (group A) 22a and the filter attenuator (group B) 22b.

The multi-tap delay 21 is for generating a signal according to the delay time based on the input original sound and outputting it from each delay.

The attenuator 22 is a multiplier having a maximum output value of 1, and controls the amount of total output for each delay from the output for each delay and the distribution of the output to the direct system and the filter system. is there.

For this reason, the attenuator 22 is provided with a pair of direct and filter attenuators 22a and 22b for each delay. In addition,
Details of the function of the attenuator 22 will be described in detail with reference to FIG.

In such a structure, a part of the original sound generated by the sound source 5 is generated by the early reflection sound generator 2 of the reverberation device 7 of the present invention.
0, and a multi-tap delay 21 of the initial reflected sound generator 20 generates a delay signal according to the elapsed time.

The generated delay signal is branched for each output from each delay and sent to the paired direct and filter attenuators 22a and 22b, and is controlled to a predetermined output value by the attenuators 22a and 22b. After that, it is sent to the adders 23a and 23b provided for each system.

The control value of the attenuator 22 provided for each delay of the direct system and the filter system is the total output amount of each delay according to the elapsed time and the distribution ratio of the output to the direct system and the filter system. Is set in advance by the maker so that the control can be performed.

Adders 23a, 23 provided for each system
The output from each delay sent to b is the adder 23
At a and 23b, the respective systems of the A group and the B group are added and the outputs are combined. The combined direct output is sent to the adder 31 which combines the direct and filter outputs.

On the other hand, the output synthesized by the filter system is, for example, filtered by a low-pass filter 24 (hereinafter referred to as LPF) and added with a frequency characteristic, and then sent to an adder 31. Is combined with the output from and sent to the rear reverberator 30.

The rear reverberation generator 30 is a well-known one which generates a rear reverberation and adds the rear reverberation to the initial reflected sound. The signal to which the rear reverberation is added by the rear reverberation generator 30 is sent to the adder 32. Then, the adder 32 synthesizes the desired sound with the original sound.

In this way, since a part of the reverberation sound, that is, the output of the filter system is changed in frequency characteristic,
According to the reverberation device of the present invention, a natural and pleasant reverberation sound can be obtained.

FIG. 3 is a diagram for explaining the operation of the initial reverberation sound generator 20 by extracting a pair of attenuators 22a _n, 22b _n from the initial reflection sound generator 20 of FIG. In the figure, reference numeral 21 is a multi-tap delay that generates an output according to the elapsed time, and the multi-tap delay 21 is provided with n delays (output ports according to the elapsed time).

22a _n is an attenuator for controlling the output of the signal output from the n-th delay to the direct system, and an attenuator for controlling the output to the 22b _n filter system.

These two attenuators 22a _n , 2
2b _{n make} a pair, and by controlling the two attenuators, the total output amount of the n-th delay and the distribution ratio of the output to each system are controlled.

As a control method, for example, when the output from the direct system of the output of the n-th delay is A _n and the output from the filter system is B _n , the total output amount P _n output from the delay is P _n = It is represented by A _n + B _n .

If the distribution ratio C _n of the n-th output to the direct system and the filter system is defined as the ratio of the total output to the output to the direct system, C _n = A _n / (A _n + B _n ) = A _n / P _n .

Therefore, when the control values of the direct system and filter system attenuators are converted based on the total output P _n and the output distribution ratio C _n to the direct system, A _n = C _n × P _n B _n = become _{P n (1-C n)} .

Therefore, for example, if the overall output value P _n is 0.
8, if the output to the direct system is 70% of the total output,

The control coefficient of the direct system is A _n = 0.7.
× 0.8 = 0.56 The control coefficient of the filter system is B _n = 0.8 × (1-0.
7) = 0.24.

The control value of each attenuator 22 thus defined is set in advance by the manufacturer at the time of manufacturing the equipment.

The outputs controlled by the attenuators 22 are added for each system by the direct adder 23a and the filter adder 23b, and the direct outputs are added to the adder 31 and the filter output. Is LPF
It is sent to 24, filtered and then sent to the adder 31, where the output of the direct system and the output of the filter system are added and combined.

Next, in the configuration illustrated in FIG. 3, when the total output is kept constant and the distribution ratio of the output to the direct system and the filter system is changed and filtering is performed using the LPF 24, the output from the adder 31 is output. The frequency characteristic of the early reflected sound that is generated will be described.

FIG. 4 is a diagram for explaining the effect of using a low-pass filter in the early reflection sound generator 20 of the present invention, where the vertical axis is the amplitude level [dB] and the horizontal axis is the frequency [Hz]. .

FIG. 4A shows the LP used in this embodiment.
FIG. 4B shows an example of the frequency characteristic of F24.
It is a figure explaining the frequency characteristic of the musical sound output from the adder 31 when using PF24.

The effect of filtering by the early reflection sound generator 20 of the present invention will be described below with reference to FIG. In the following description, the total output is P _n = 1 in order to make the description easier to understand, and only the distribution ratio of the outputs to the direct system and the filter system is changed.

When C ₀ = 1 in the figure, the delay output is sent to the direct system at 100% and no output is sent to the filter system. Therefore, control by the filter 24 is not performed, and the frequency characteristic curve is a straight line such as Become.

Next, when C ₁ = 0.708, about 70% of the delay output is output to the direct system and 30% is output to the filter system. Therefore, about 3 input to the filter system
In FIG. 4 (a), the output of 0% is output as it is without any attenuation up to the point a. Therefore, 100% is output as shown in the figure up to the point a of FIG. 4 (b). The curve is horizontal.

Between point a and point b, the output of the frequency characteristic of the filter 24 changes according to the frequency change as shown in FIG. Is controlled and attenuated according to the frequency characteristic.

On the other hand, since the output of the direct system is sent to the adder as it is, it seems that the output of the direct system and the output of the filter system to which the frequency characteristic of 30% is added are added by the adder 31. An output with frequency characteristics added is obtained.

Further, in the range where the frequency is higher than the point b, the output from the filter 24 in FIG.
, The output from the adder 31 becomes almost only the output from the direct system, and the output added by the adder 31 becomes horizontal like.

Similarly, when C ₃ = 0.355,
About 35% of the delay output is output to the direct system and 65% is output to the filter system. Therefore, about 65% of the output that is input to the filter system is attenuated between points a and b in FIG. 4A, so the degree of attenuation is greater than when C ₁ = 0.708. The output from the adder 31 is shown in FIG.
It becomes the characteristic curve of.

As described above, according to the present invention, even if the filter 24 having a constant frequency characteristic is used, the adder 3 is changed by changing the distribution ratio of the outputs to the direct system and the filter system.
The frequency characteristic of the musical tone signal output from 1 changes into various characteristic curves as shown in FIG.

Further, if the output from each delay is controlled together with the distribution ratio of the output to the direct system and the filter system, it is possible to deal with the musical tone signal attenuated according to each delay time, and the simple structure and low price. It is possible to provide the early reflection sound generator 20 of

FIG. 5 shows the early reflection sound generator 20 of this embodiment.
6 shows frequency characteristics when a high-pass filter is used as the filter 24, and FIG. 6 shows frequency characteristics when a band-pass filter is used.

Since various frequency characteristics can be obtained depending on the type of the filter 24 used as illustrated in FIGS. 5 and 6, various filters may be used properly according to the purpose of use.

[0070]

As described above in detail, according to the early reflection sound generator of the reverberation device of the present invention, the output from each delay of the multi-tap delay and the output of the output to the direct system and the filter system are provided. With a simple structure that controls the distribution with an attenuator, it is possible to express subtle performance effects with changes in frequency characteristics.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an overall configuration of an electronic musical instrument including a reverberation device of the present invention.

FIG. 2 is a diagram illustrating a configuration of a reverberation device of the present invention.

FIG. 3 is a diagram illustrating a function of an early reflection sound generator of the reverberation device of the present invention.

FIG. 4 is a diagram for explaining frequency characteristics by the low-pass filter according to the present invention.

FIG. 5 is a diagram for explaining frequency characteristics by the high-pass filter according to the present invention.

FIG. 6 is a diagram for explaining frequency characteristics by the bandpass filter according to the present invention.

FIG. 7 is a diagram illustrating a configuration of a conventional reverberation device.

[Explanation of symbols]

 1 keyboard 2 key scan circuit 3 operation panel 4 panel scan circuit 5 sound source 6 waveform memory 7 reverberation device 8 D / A converter 9 amplifier 10 speaker 11 CPU 12 ROM 13 RAM 20 initial reflected sound generator 21 multi-tap delay (delay means) 22 attenuator (multiplier) (control means) 22a A group attenuator (multiplier) (control means) 22b B group attenuator (multiplier) (control means) 23 Adder (combining means A) 23a Addition of A group Unit (combining means A) 23b adder of B group (combining means A) 24 low-pass filter (filter means) 30 rear reverberation generator 31 adder (combining means B) 32 adder (combining means C)

Claims (4)

[Claims] 1. A delay unit for generating a plurality of delay signals according to an elapsed time based on an original sound, each delay signal generated by the delay unit being controlled to an output value according to each elapsed time, and a direct signal. To control the distribution ratio of the output to the system and the filter system,
Control means provided for each delay; synthesis means A for synthesizing the output controlled by the control means provided for each delay for each direct system and each filter system; Filter means for filtering the output of the system to add frequency characteristics, combining means B for combining the outputs of the direct system and the filter system, and rear reverberation for adding rear reverberation to the signal combined by the combining means B. A reverberation device comprising: an adding unit and a synthesizing unit C for synthesizing a signal to which the rear reverberation is added by the rear reverberation unit and an original sound. 2. The reverberation device according to claim 1, wherein the filter used in the filter means is a low-pass filter. 3. The reverberation device according to claim 1, wherein the filter used in the filter means is a high-pass filter. 4. The filter used in the filter means is a bandpass filter.
Reverberation device described.