JP2644974B2 - Modulation effect device for electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulation effect device for an electronic musical instrument for imparting a modulation effect such as vibrato, glow, tremolo or the like to a tone signal. In such a modulation effect device, it is desired to be able to generate a more varied modulation effect.

[0002]

2. Description of the Related Art FIG. 9 shows a general configuration of a conventional electronic musical instrument. In the figure, reference numeral 21 denotes a keyboard, which generates pitch information and key depression / release information in response to a key operation and supplies the information to a sound source generator 22. The sound source generator 22 is a circuit for generating a sound source signal from which a tone signal is generated. The sound source generator 22 is constituted by a voltage-controlled oscillator or the like, and generates a sound source signal having a frequency corresponding to pitch information from the keyboard 21. The sound source signal generated by the sound source generator 22 is sent to a voltage control filter 24, where the tone is processed by frequency characteristics and the like according to the envelope signal from the envelope generator 26, and further sent to a voltage control amplifier 25. The volume is controlled in accordance with the envelope signal from the envelope generator 27, and the voltage control amplifier 25 outputs the tone signal.

[0003] A low frequency oscillator 23 is for giving a "swaying" effect to a musical tone, and includes a low frequency periodic modulation signal,
For example, a sine wave or a triangular wave is generated and supplied to the sound source generator 22. The sound source generator 22 modulates the frequency of the sound source signal by the modulated signal, thereby giving a frequency fluctuation to the sound source signal, and adding a vibrato effect to the musical sound.
The effect that can be provided by using the low-frequency oscillator 23 is not limited to vibrato. For example, by giving a fluctuation to the characteristics of the voltage control filter 24 by a modulation signal, a glow can be given to a musical tone, and the voltage control can be performed. Tremolo can be added to a musical tone by giving fluctuations to the volume characteristic of the amplifier 25.

[0004]

Conventionally, a monotonous waveform such as a sine wave or a triangular wave has been used as a modulation signal for imparting an effect such as vibrato to a musical tone. That is, the rising part and the falling part of the modulation signal waveform are symmetrical waveforms, and their durations are the same time (ie, half cycle). Therefore, for example, when the vibrato effect is generated by this modulation signal, the time at which the pitch rises and the time at which the pitch falls as fluctuation of the musical tone are always equal.
As a result, the effect given to the musical tone is monotonous, and is not a varied effect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a modulation effect device for an electronic musical instrument, which can provide a more varied modulation effect to a tone signal. It is in.

[0006]

Means and operation for solving the problem] The above problems
In order to solve the problem, the modulation effect device of the electronic musical instrument according to the present invention
In one form, the modulation effect is added by the modulation signal.
Electronic musical instrument used to generate a given musical tone signal
In one modulation effect device, one cycle of the modulation signal
Setting means for setting a ratio of division into sections;
In each of the divided sections, the amplitude gradually increases with time.
The shape changes according to the division ratio set by the setting means
Generating means for generating a modulated signal that becomes
It was done. This generating means includes a plurality of divided
Instead of generating a modulated signal in each section of the section
Therefore, the amplitude in at least one section
Gradually changes to the division ratio set by the setting means.
It may generate a modulation signal having a shape according to
No. In this modulation effect device, the operator modulates with the setting means.
Divide one cycle of the tuning signal into a plurality of sections at an arbitrary division ratio
You. Generating means for each section or at least one section
And the amplitude gradually changes with time to
A modulation signal having a shape corresponding to the rate is generated. Therefore,
The author only sets the division ratio arbitrarily with the setting means,
Modulated signals with various shapes can be created,
It is possible to impart a modulated modulation effect to a tone signal.

The setting means sets one cycle of the modulation signal to
Set the ratio of division into the first section and the second section
Wherein the generating means includes:
The amplitude of the modulated signal is changed from the first value to the second value with time.
Of the modulated signal in the second section.
The amplitude of the signal from the second value to the first value over time
Can be configured to change gradually. This
With this configuration, the waveform of the modulation signal can be, for example, a triangular wave,
It can be continuous, such as a sine wave.

Further, the setting means sets the division ratio to a number.
It can be configured to be set by a quantity value. in this way
By configuring, the setting means sets the division ratio numerically
Then, the shape of the modulation signal can be changed in various ways
This operation is complicated for the operator.
Easy to understand and simple operation
Signal waveforms can be easily created. Also generate the above
Means for changing according to the division ratio set by the setting means;
Can be configured to generate a modulated signal whose amplitude varies with speed
You. With this configuration, the waveform can be adjusted according to the division ratio.
The rate of change of the amplitude is changed, so that modulated signals of various shapes
Issue. In addition, it is generated by the generation means described above.
The waveform shape of the modulated signal
It can be configured to further include a selecting means for selecting. This
With this configuration, the wave of the modulated signal generated by the generation means is
As the shape, the selection means, for example, triangular wave, sine wave
Shape, or triangular wave in the first half, sine wave in the second half
Various waveform shapes can be selected.

A modulation effect device for an electronic musical instrument according to the present invention.
In another form, the modulation effect is given by a modulation signal.
Of the electronic musical instrument used to generate the
In one embodiment, one cycle of the modulation signal is divided into a plurality of sections.
Setting means for setting the ratio of division to divide into
A random number generating means which is generated sequentially, and
The random number generating means generates a random number at the start of each section.
Generates a modulated signal with a waveform whose value is a constant amplitude value in that section.
And generating means for generating the information. This
In the modulation effect device, the operator sets the modulation signal by the setting means.
Is divided into a plurality of sections at an arbitrary division ratio. Living
Generating means for each section, wherein the random number generating means
The random value generated at the start of
A modulated signal having a waveform is generated. This allows random changes
Modulation signal that changes
A tonal effect can be added to a tone signal.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic configuration of an electronic musical instrument provided with a modulation effect device as one embodiment of the present invention. This electronic musical instrument performs various processes using a microcomputer, and is configured so that a vibrato effect is applied to a musical sound as a modulation effect by a modulation effect device.

In FIG. 2, the embodiment includes a central processing unit (CPU) 1, a read / write memory (RAM) 2,
In addition to the general configuration of a microcomputer system such as a read-only memory (ROM) 3, a timer 4, and a bus 8,
A keyboard unit 5 and a panel unit 6 are also provided as input devices, and a tone generation circuit 7 is provided as an output device. Further, a tone signal output from the tone generation circuit 7 is amplified by an amplifier 9 and supplied to a speaker 10. ing.

The keyboard section 5 comprises a keyboard and a key operation detecting circuit. The key operation detection circuit monitors the key state (key pressed state / key released state) of each key, and when the key state of any key changes, interrupts the CPU 1 via the bus 8 and sets the key state. Key data related to the changed key is CP
It is configured to transfer to the U side. In the panel part 6,
Various controls, for example, controls T, L, D, and S for vibrato effect setting, and a tone color selection control (here, illustrated) for selecting a tone color (for example, violin tone, flute tone, etc.) of a generated musical tone. Is provided, and an operation detection circuit for detecting the operation state of these operators is provided.
It is configured to be transferred to the CPU 1 via the bus 8 under the control of the PU 1.

The controls for setting the vibrato effect include controls T, L, D, and S. Among these controls, the control T is a control for setting the cycle of the modulation signal. Period setting data T (values from 0 to 100) can be set in increments of one corresponding to the period of the modulation signal (values from 50 msec to 0.5 sec).

An operator L is an operator for setting the magnitude of the modulation signal, that is, the degree of vibrato.
100%) corresponding to the degree setting data L (0
-1) can be set in increments of 0.1. An operation element D is an operation element for setting the duty ratio of the modulation signal. The operation element D is used to change the duty ratio setting data (0 to 1) corresponding to the duty ratio (0 to 1). 0.
It can be set in increments of 01. That is, one cycle of the modulation signal generated by the embodiment device is shown in FIGS.
As shown in (e), it is divided into a first half section (section I) and a second half section (section II), and the duty ratio set by the above-described operator D is the first half with respect to the length of one cycle of the modulation signal. It determines the length of the section.

The operator S is an operator for selecting the waveform (triangular, sine, or random) of the modulation symbol. The operator S has a waveform (triangular, sine, or sinusoidal). The waveform shape setting data (0, 1, 2) is set corresponding to the random shape.

The CPU 1 is a circuit for controlling the entire apparatus. For example, a predetermined interrupt routine is executed in response to an interrupt at the time of a key operation from the keyboard unit 5, and key data relating to the key whose key state has been changed obtained from the keyboard unit 5 is virtually provided in the RAM 2. The key data is stored in a ring-shaped key data FIFO (first-in / first-out memory). Further, the key data stacked on the key data FIFO, the tone data corresponding to the tone selected by the tone selection operator on the panel unit 6, and the operator T,
Based on the vibrato setting data set by L, D, and S, control data for controlling the pitch, timbre, volume, etc. of the generated musical tone is created and provided to the musical tone generating circuit 7. Note that two types of pitch control data are provided: key data corresponding to a key that has been pressed and released, and vibrato control data as a modulation signal that changes value periodically.

The ROM 3 stores various programs executed by the CPU 1, a plurality of tone data for determining the timbre of the musical tone to be generated, and a SIN for generating a sine wave waveform.
Tables and the like are stored in advance. The tone data is various setting data necessary for selecting a tone color of a musical tone such as a violin tone or a flute tone, and vibrato setting data is also included in the tone data. Further, as shown in FIG.
A sine wave covering a range of π / 2 (radian) is stored as an amplitude level “0” to “100” by an address 101.

The RAM 2 is a working memory.
In AM2, storage areas for various registers, flags, key data FIFO, and the like necessary when the CPU 1 executes the program are set. Timer 4 is 5mse
This is a timer for giving a timer interrupt to the CPU 1 for each c. When the CPU 1 receives a timer interrupt, it performs a predetermined timer interrupt process.

The tone generating circuit 7 is a circuit such as a synthesizer module for generating a tone signal based on the control data passed from the CPU 1. The generated tone signal is emitted as a tone from a speaker 10 via an amplifier 9. You.

The operation of this embodiment will now be described with reference to FIGS.
And a signal waveform diagram of FIG. 7 will be described. FIGS. 4, 5, and 6 show a main routine, a panel processing routine, and a timer interrupt processing routine executed by the CPU 1, respectively. FIG. 7 is a waveform diagram illustrating how a modulated signal waveform for the vibrato effect is formed.
(A) in the figure shows the output waveform of the counter COUNT, (b)
Is the waveform of the data LFO, and (c), (d), and (e) are the vibrato control data supplied to the musical tone generation circuit 7 when the triangular waveform, the sine waveform, and the random waveform are selected. The section I shows the first half of the modulated signal waveform, the section II shows the second half, and the duty ratio is set to 0.25.

First, the overall processing executed by the CPU 1 will be described. The CPU 1 repeatedly executes the main routine shown in FIG. Key data F
The processing of loading the IFO and the timer interrupt processing routine of FIG. 6 started by a timer interrupt from the timer 4 every 5 msec are executed. The timer interrupt processing routine is a process for sequentially generating vibrato control data as a modulation signal.

Hereinafter, the main routine executed by the CPU 1 will be described with reference to FIG. When the power is turned on, the execution of the program is started, and the keyboard 5, RAM 2, panel 6, and tone generation circuit 7 are initialized (step A). At this time, a predetermined tone color is selected, and tone data corresponding to this tone color is read from the ROM 3 and stored in a tone data storage area provided in the RAM 2.

Next, a panel process for setting various flags and registers in accordance with the operation state of the operator of the panel unit 6 is performed (step B). For example, when the tone color selection operator is operated, the tone data in the tone data storage area provided in the RAM 2 is rewritten. When the vibrato setting operator is operated, the vibrato setting data T,
Rewrite L, D, and S. These processes are shown in FIG.
The details will be described later with reference to FIG.

After the panel processing is completed, it is next determined whether or not a new key press / key release operation has been performed on the keyboard section 5 (step C). Specifically, when a key operation is performed on the keyboard unit 5, the key data is stored in the key data FIFO due to an input interrupt. Therefore, the key press / release is determined based on whether or not the key data is stored in the key data FIFO. It is determined whether or not a key operation has been performed. If no key data is stored, the process returns to the panel process (step B) and the same process is repeated.

On the other hand, when the key data is stored, a process for starting / stopping generation of a musical tone related to the key operation is executed (step D). That is, key data FIF
The key data stored in O is lowered by one, and control necessary for generating a tone signal in the tone generating circuit 7 based on the lowered key data and the tone data stored in the tone data storage area of the RAM 2 The data is created and given to the tone generation circuit 7 to control start / stop of tone generation. When this music sound generation start / stop processing is completed,
Returning to the panel processing of step B, the same processing is repeated thereafter.

The details of the panel processing routine in step B will be described below with reference to FIG. This panel processing routine is a processing for setting various flags, registers, and data necessary for generating vibrato control data in accordance with the operation state of the operation unit of the panel unit 6. Has the following:

Section display flag POS · F: A flag for displaying the first half / second half of the modulated signal waveform, and is set to “0” in the first half and “1” in the second half. Counter COUNT: A register for counting the elapsed time in one cycle of the modulation signal. Counter preset data CPD1: Initial value data to be set in the counter COUNT at the start of the first half section. Counter preset data CPD2: Initial value data set in the counter COUNT at the start of the latter half section. Data LFO: output OUT serving as vibrato control data
Is generated, and the value changes in a range of 0 to 100. Increment data INC: a rising gradient of the data LFO. Decrement data DEC: Downward slope of data LFO.

When the panel processing routine is executed, first, it is determined whether or not the timbre has been switched by the timbre selection operator of the panel unit 6 (step B1). As a result, when it is determined that one of the tone selection operators has been operated, the tone data corresponding to the operated operator is read out from the ROM 3 and the RA is read based on the tone data.
The contents of the tone data storage area provided in M2 are rewritten (step B2).

Next, an operator T for setting a vibrato effect,
It is determined whether any of L, D, and S has been operated (step B3). If none of the controls T, L, D, and S has been operated, the panel processing routine ends and the process returns to the original main routine. On the other hand, when any one of the operators T, L, D, and S is operated, a process of rewriting various flags, registers, and data necessary for generating vibrato control data in accordance with the operation state of the operator. (Steps B4 to B13).

In this process, the timer interrupt is first masked (step B4). When the timer interrupt is masked in this way, even if the timer interrupt is applied to the CPU 1 during that time, the timer interrupt processing is suspended and executed after the mask is released.

After masking the timer interrupt in this way, the vibrato setting data T, L, D, and S are rewritten corresponding to the operated vibrato effect setting operator (step B5).

Here, the operated operator for setting the vibrato effect is an operator L for setting the degree of vibrato.
If it is only, there is no need to reset other flags, registers, and data. Therefore, when the rewriting of the vibrato setting data is completed, it is determined whether or not the rewritten data is only the degree of vibrato L and other data T, D, and S are not set (step B6).

If the result of this determination is that only the setting data L is set, the masking of the timer interrupt is canceled (step B13), the panel processing routine ends, and the process returns to the original main routine. On the other hand, when it is determined that other setting data T, D, and S have been set, various flags, registers, and data are set (steps B7 to B12).

In this setting process, first, the product of the duty ratio D and the period T is obtained as the first counter preset data CPD1, and a value (1-D) obtained by subtracting the duty ratio D from 1 and the period T are obtained. Are set as the second counter preset data CPD2 in the registers (step B7). As shown in FIG. 7A, the counter preset data CPD1 and CPD2 have the modulated signal waveforms of the first half section I and the second half section II, respectively.
Is set as the preset data in the counter COUNT at the start time, and indicates the time length of each section.

Next, it is determined whether or not the value of the counter preset data CPD1 is "0" (step B8). The value of the counter preset data CPD1 being "0" indicates that there is no first half section of the modulated signal waveform. Therefore, if it is not "0", that is, if the first half section exists, various flags, registers, and data for the first half section are set (step B9). On the other hand, in the case of “0”, that is, when the first half section does not exist, the various flags, registers,
The data is set (step B10).

In the data setting process for the first half section (step B9), the section display flag POS · F indicating the first / second half section of the modulated signal waveform is set to “0” indicating the first half section, and the counter is set. The counter preset data CPD1 representing the length of the first half section is set in COUNT, and “0” which is the start value of the amplitude in the first half section is set in the data LFO. Further, increment data INC
The quotient obtained by dividing the maximum amplitude value “100” of the LFO by the value of the count preset data CPD1 that is the first half section length, that is, the rising gradient of the LFO waveform in the first half section is set. As described above, in step B9, the section display flag POS / F, the counter COUNT, and the data LFO are set with the initial value in the first half section of the modulation signal waveform, and the value of the increment data INC is obtained.

In the data setting process for the second half section (step B10), the section display flag POS · F indicating the first half / second half section of the modulated signal waveform is set to “1” indicating the second half section. Counter COU
Counter preset data CP representing the latter half section length in NT
D2 is set, and "100" which is the start value of the amplitude in the latter half section is set in the data LFO. As described above, in step B10, the section display flag POS · F and the counter CO
An initial value in the latter half section of the modulation signal waveform is set in UNT and data LFO.

When step B10 is completed, the quotient obtained by dividing the maximum amplitude value of the LFO "100" by the value of the counter preset data CPD2 which is the latter half section length, that is, the waveform of the LFO waveform in the latter half section, is further provided as the decrement data DEC. A descending gradient is obtained and set (step B12). When the setting is completed, the mask of the timer interrupt is released (step B13), and the panel processing is ended to return to the original main routine.

When the setting of the initial value in the first half section is completed (step B9), the counter preset data C
It is determined whether the value of PD2 is "0" (step B1).
1). Since the counter preset data CPD2 being “0” indicates that the latter half section does not exist,
If "0", that is, if there is no second half section, the mask of the timer interrupt is released (step B13), and the panel processing is terminated to return to the main routine.

As described above, in steps B5 to B12, the vibrato setting data T,
L, D, and S are rewritten, and counter preset data CPD1, CPD2, increment data INC, and decrement data DEC for generating a modulation signal are obtained.
T, which initializes the value of the data LFO. In addition,
If the value of the counter preset data CPD1 is "0" in the timer interrupt processing described later, the increment data INC is not used, and if the value of the counter preset data CPD2 is "0", the decrement data is used. Since the DEC is not used, the data INC and DEC are not set in such a case.

Next, a timer interrupt processing routine executed by the CPU 1 in response to a timer interrupt generated every 5 msec by the timer 4 will be described with reference to the flowchart of FIG.

When the timer interrupt process is started, first, "1" is subtracted from the value of the counter COUNT (step X).
1). In this case, it is assumed that the value of the counter COUNT is always "1" or more at the start point of the first half section or the second half section. By this subtraction processing, the value of the counter COUNT becomes the counter preset data CPD1 or CPD2 as shown in FIG.
From the value of タ イ マ タ イ マ タ イ マ タ イ マ タ イ マ タ イ マ タ イ マ タ イ マ タ イ マ.

Next, it is determined whether or not the value of the counter COUNT has become "0" as a result of subtracting "1" from the counter COUNT (step X2). This counter COUN
The fact that the value of T has become “0” indicates that the first half or the second half of the modulated signal waveform has ended, as shown in FIG. 7A. Therefore, when it is determined that the value of the counter COUNT is "0", that is, the end of the first half / second half section, the initial setting processing of the next section (steps X3 to X9) is performed. If it is, the data LFO value is updated (steps X11 to X13).

Initial setting processing for the next section (steps X3 to X
In 9), first, it is determined whether or not a section display flag POS · F indicating the first / second half section of the modulation signal waveform is “0” (step X3). If the section display flag POS · F is “0”, it indicates that the section that has just ended is the first half section and the second half section starts from the next section.
First, the counter preset data CPD2 indicating the length of the latter half section is set in the counter COUNT, and "100" which is the amplitude initial value of the latter half section is set in the data LFO.

On the other hand, the section display flag POS.F is "1".
Indicates that the currently completed section is the second half section and the first half section starts from the next. Therefore, the counter preset data CPD1 indicating the first half section length is set in the counter COUNT, and the first half section is set in the data LFO. Is set to "0" which is the initial value of the amplitude. When the setting of the value of the counter COUNT and the value of the data LFO is completed (steps X4 to X7), the value of the section display flag POS · F is inverted so that the value indicates the next section (step X8). .

Thereafter, it is further determined whether or not the value of the counter COUNT is "0" (step X9). If it is "0", it indicates that the currently set counter preset data CPD1 or CPD2 is "0", that is, that the corresponding section does not exist, so the process returns to step X3, and the other section is initialized again.

If the value of the counter COUNT is not "0" (step X9), a random number value RND is generated (step X10). This random number value RND is used when a random waveform is selected by the operator S. Specifically, the generation method is to multiply the previous random number value RND represented by 8 bits by "5". , The lower 8 bits of the sum of the result of adding “5” to the product and taking this as the new random number value RND. By repeatedly performing such processing, the range of “0 to 255” is obtained. A random number is obtained.

On the other hand, if the result of the determination in step X2 is that the counter COUNT is not "0", that is, if it is determined that it is in the middle of the first half or the second half, the section display flag POS.F is set to "0". It is determined whether or not it is (step X11). If “0”, that is, in the middle of the first half section, the value of the data LFO is incremented by the increment data INC.
(Step X12). If "1", that is, in the middle of the latter half section, the value of the data LFO is reduced by the value of the decrement data DEC (step X1).
3).

As described above, in steps X11 to X13,
Since the process is in the middle of the first half or the second half of the modulated signal waveform, a process for continuing the process in that interval is performed. The data INC or DEC is added or subtracted every time there is a timer interrupt, so that the data L
As shown in FIG. 7B, the value of FO changes linearly from “0” to “100” in the first half section, while it changes linearly from “100” to “0” in the second half section. Will change.

When these processes are completed, the value of the operation element S is determined (step X14). If the waveform shape setting data S is “0” indicating the triangular wave-like vibrato effect, the value of the data LFO is directly used as the output OUT (step X15).

If the setting data is "1" indicating a sinusoidal vibrato effect, the SIN table is referred to using the value of the data LFO as an address, and the amplitude value data read from the SIN table is used as the output OUT (step X16).

When the setting data S is "2" indicating a random vibrato effect, the value of the random number RND is multiplied by "100", the product is divided by "255", and the quotient is divided. Output OUT. This arithmetic processing is performed as “0
This is a process of converting the random number RND in the range of “255” to “0-100” which is the amplitude range of the output data OUT.

When the output OUT is obtained in steps X15 to X17, the value obtained by subtracting "50" from the value of the output OUT is multiplied by the degree of vibrato L, and this product is supplied to the musical sound generation circuit 7 as vibrato control data. (Step X18). The processing of this step X18 is performed as shown in FIG.
As shown in (c), (d) and (e), “0 to 10
The output OUT in the range of "0" is set to -50L to 5 around "0".
The signal is converted into a vibrato control signal that changes between positive and negative in the range of 0L.

That is, as shown in FIG. 7 (c), the value of the triangular wave-shaped vibrato control data ranges from "-50L" to "50L" in the first half section and "5L" in the second half section.
As shown in FIG. 7 (d), the value of the sine-wave vibrato control data which changes linearly from “0L” to “−50L” is “-50L” to “50L” in the first half section.
In the latter half section, the half-cycle sine wave curve changes from “50L” to “−50L”, and the random vibrato control data is obtained at the start of each section as shown in FIG. The generated random numbers are retained during the interval.

As described above, in steps X14 to X18, a process of generating a modulation signal having a set waveform shape and magnitude based on the value of the data LFO and supplying it to the musical tone generation circuit 7 as vibrato control data. Is going. Upon completion of the above processing, the process returns to the main routine and waits for the next timer interrupt from the timer 4.

FIG. 8 shows the vibrato control data generated when the duty ratio is changed. In the figure,
(A) is a triangular wave-shaped vibrato control data when the duty ratio is "0", (b) is a sinusoidal vibrato control data at that time, and (c) is a duty ratio of "0.
Triangular wave-shaped vibrato control data in the case of 5 ″,
(D) shows sinusoidal vibrato control data at that time. As shown, (a) shows a sawtooth wave,
(C) is a triangular wave, and (d) is a sine wave.

As described above, the time at which the pitch rises and the time at which the pitch rises due to the duty ratio included in the vibrato setting data set as part of the tone data at the time of selecting the tone, or the vibrato effect setting operator. It is possible to generate a modulation signal (vibrato control data) that is set so as to have a different duration. Here, when the value of the vibrato control data is positive, the pitch is corrected to be high, and when the value is negative, the pitch is corrected to be low. When the vibrato effect is not provided, the vibrato control data is set to “0”.

The vibrato control data is, for example, ± 1.
The pitch may be corrected so that the frequency changes by ± 10% when the frequency changes by 0, or the frequency may be corrected by ± 10H.
The pitch may be corrected so as to change z.

Various modifications can be made to the embodiments of the present invention. For example, in the above embodiment, the present invention
Although described as a modulation effect device that imparts a vibrato effect to a musical tone by giving a fluctuation to the pitch, the present invention is not limited to this, and other elements that form the musical tone, such as timbre and volume, may be modulated. Can also. For example, a glow effect can be given to a musical tone by giving fluctuation to a tone color, a tremolo effect can be given to a musical tone by giving fluctuation to a sound volume, or a combination of vibrato, growl, and tremolo can be used.

In the above-described embodiment, one cycle of the modulated signal is divided into the first half and the second half. However, the present invention is not limited to this, and this section is divided into three or more sections. It is also possible to change the rise / fall time of the modulation signal in the step (1), whereby a more varied modulation effect can be obtained. In the above-described embodiment, the waveform of the modulation signal is the same type of waveform in both the first half and the second half (that is, any one of a triangular waveform, a sine waveform, and a random waveform).
However, the present invention is not limited to this. For example, an arbitrary waveform shape may be generated in each section such as a triangular waveform in the first half section and a sine wave or random shape in the second half section. It can also be configured.

In the above embodiment, the duty ratio is the ratio of the length of the first half section to the length of one cycle of the modulation signal waveform. However, if the lengths of the first half section and the second half section are determined, Other setting methods may be used. For example, various setting methods can be adopted as long as the division ratio of a plurality of divided sections can be set, for example, a duty ratio is a ratio of the length of the first half section to the length of the second half section. It is.

[0062]

As described above, according to claims 1 to 6,
According to the respective inventions, the means for setting the division ratio is
One cycle of the modulated signal is divided into a plurality of sections,
The amplitude of the modulated signal gradually increases in at least one section
And the shape, such as the gradient, is set by the setting means.
In accordance with the split ratio set in
In this case, the waveform of the modulation signal is
It can be a great variety, which makes
It is possible to add rich modulation effects to musical sounds.
You. Moreover, during the performance of the performer, the dividing ratio is set by the setting means.
If you change the rate in real time,
Various modulation effects applied to musical sound signals in real time
Changes, so you can easily modify the modulation effect that the player prefers
Can be selected and set. The invention according to claim 7
According to the equation, the constant amplitude value changes randomly in each section.
A highly modulated signal, which
It is possible to add a variety of modulation effects to musical sounds
Become.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the operation of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of an electronic musical instrument including a modulation effect device as one embodiment of the present invention.

FIG. 3 is a diagram for explaining a SIN table in the embodiment device.

FIG. 4 is a flowchart showing a main routine executed by a CPU of the embodiment device.

FIG. 5 is a flowchart showing in detail a panel processing routine in a main routine.

FIG. 6 is a flowchart showing a timer interrupt processing routine executed by a CPU of the embodiment device.

FIG. 7 is a waveform diagram showing how a modulated signal waveform for the vibrato effect is generated.

FIG. 8 is a waveform diagram showing vibrato control data when the duty ratio is changed.

FIG. 9 is a diagram showing a configuration of a conventional general electronic musical instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central processing unit (CPU) 2 Read / write memory (RAM) 3 Read-only memory (ROM) 4 Timer 5 Keyboard part 6 Panel part 7 Musical sound generation circuit 8 Bus 9 Amplifier

Claims (7)

(57) [Claims] 1. A modulation effect device for an electronic musical instrument used for generating a tone signal to which a modulation effect is given by a modulation signal, wherein a division ratio of dividing one cycle of the modulation signal into a plurality of sections.
Setting means for setting the amplitude in each of the divided sections with time.
Next, change according to the division ratio set by the setting means.
A modulation effect device for an electronic musical instrument, comprising: a generation unit that generates a modulation signal having a shape . 2. The method according to claim 1, wherein the generating unit generates the plurality of divided sections.
Instead of generating a modulated signal in each section,
Amplitude gradually increases with time in at least one section
And the shape according to the division ratio set by the setting means.
2. A modulated signal according to claim 1, wherein the modulated signal is generated.
Modulation effect device for electronic musical instruments. 3. The setting means sets one cycle of the modulation signal to a first cycle.
Sets the ratio of division into two sections
And The generation means may include an amplitude of the modulation signal in the first section.
Gradually changes from the first value to the second value over time
And in the second section, the amplitude of the modulated signal
Gradually from the second value to the first value
2. The modulation effect device for an electronic musical instrument according to claim 1, wherein
Place. 4. The setting means sets the division ratio by a quantity value.
The electronic device according to any one of claims 1 to 3, wherein
Modulation effect device for child instruments. 5. The division means set by the setting means,
Generates a modulated signal whose amplitude changes at a changing speed according to the ratio of
The electron according to claim 1, wherein the electron is formed.
Modulation effect device for musical instruments. 6. A waveform shape of a modulation signal generated by said generating means.
Selection means for selecting from among multiple types of waveform shapes
The electronic musical instrument according to any one of claims 1 to 5, further comprising:
Toning effect device. 7. A musical tone to which a modulation effect has been given by a modulation signal.
Modulation effect device of electronic musical instrument used to generate signal
In place Division ratio for dividing one cycle of the modulation signal into a plurality of sections
Setting means for setting , Random number generating means for sequentially generating a random value, In each of the divided sections, the random number generating means sets
The random value generated at the start of
Generating means for generating a modulated signal having a waveform
Characteristic modulation effect device for electronic musical instruments.