JP2677149B2 - Effect applying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to external musical instruments such as electric musical instruments .
The present invention relates to an effect adding device that gives an effect to a musical sound generated by a musical instrument .

[0002]

2. Description of the Related Art Conventionally, various effect imparting devices have been provided for electric musical instruments such as electric guitars. As this kind of effect imparting device, for example,
In addition to an equalizer that changes output characteristics for each frequency band of an input musical tone signal, there is a device that imparts various effects such as distortion that distorts the musical tone and reverb that adds reverberation to the musical tone. In addition, there is a volume pedal as an operator used to adjust the volume, but the output of this volume pedal is assigned to the center frequency of the previous equalizer, and the cutoff frequency is raised or lowered according to the amount of depression of the volume pedal It is also being adjusted.

[0003]

By the way, conventionally, a player of an electric musical instrument such as an electric guitar sometimes changes the volume of a musical tone being sounded with time in order to enhance the performance effect. In this case, the performer changes the volume by adjusting the amount of depression of the volume pedal. However, it is difficult to perform such an operation during a performance, and there is a problem that an extremely sophisticated performance technique is required. When changing the characteristics of an effector such as an equalizer by depressing the volume pedal,
The volume cannot be adjusted using the volume pedal. In such a case, the player has requested a means for changing the volume by means other than the volume pedal.

The present invention has been made under such a background, and provides an effect imparting device capable of changing the volume of a musical tone by a simple operation during a performance without using a volume pedal. Is intended.

[0005]

In order to solve the above-mentioned problems, in an effect imparting device which is connected to an external musical instrument and imparts an effect to a musical sound output from the musical instrument, a volume change is imparted to the musical tone. Switch to instruct
And a musical instrument in response to an instruction from the switch means.
By independently of the generation start of the musical tone, comprising a volume change applying means for applying a predetermined temporal change in the volume of the musical tone,
The volume change imparting means adjusts the volume of the musical sound to the first volume.
Is gradually decreased from a predetermined value of 2 to a second predetermined value, and as soon as the second predetermined value is reached, it is gradually increased from the second predetermined value to the first predetermined value. .

[0006]

According to the above-mentioned structure, in response to the instruction of the switch means, regardless of the start of the generation of the musical tone by the musical instrument, a predetermined temporal change with respect to the volume of the inputted musical tone, that is, the first predetermined. Value gradually decreases from the second predetermined value,
Immediately after reaching the second predetermined value, a change is gradually given from the second predetermined value to the first predetermined value, so that the operator operates the switch means. It is possible to give the effect of imparting the above-mentioned temporal change to the volume of the musical sound.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A: First Embodiment First, a first embodiment of the present invention will be described. 1 is a block diagram showing the configuration of an effect imparting device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a CPU (cenntral processing unit) that controls each unit of this device.
It is. A ROM (read only memory) 2 stores a program executed by the CPU 1, and a RAM (randam a
ccess memory 3 is the CPU 1 such as information input by the operator
Stores the information needed to execute the program by. The operation panel 4 has a switch group for allowing the operator to input various control data, and is connected to the bus 13 via the panel interface 10. Volume pedal 5
Is an operator for changing the volume according to the amount of depression of the operator, and is connected to the bus 13 via the pedal interface 11. The operation panel 4 has a switch for switching the output signal based on the depression amount of the volume pedal 5 to be used for control other than the volume.
The switch will be described later. The foot switch group 6 enables / disables various effect functions of this device.
A switch group for switching invalidity, which is connected to the bus 13 via the switch interface 12.
The foot switch group 6 will be described later. 7
Is an effect applying circuit, which performs processing for applying the above-mentioned various effects to a musical sound. An A / D (analog / digital) converter 8 receives a tone signal (analog signal) to which an effect is to be applied from the outside, converts the tone signal into a digital signal and outputs it. A D / A (digital / analog) converter 9 converts the digital signal processed by this device into an analog signal and outputs it. Of the elements described above, CPU1, ROM2, R
AM3, effect applying circuit 7, A / D converter 8, D /
The A converter 9, the panel interface 10, the pedal interface 11, and the switch interface 12 are connected to each other by a bus 13. The volume pedal 5 is externally connected to this device.

FIG. 5 is an external view of this device.
In this figure, 6a is a distortion foot switch, 6b is an equalizer foot switch, 6c is a reverb foot switch, and 6d is an envelope foot switch, which corresponds to the foot switch group 6 in FIG. When the operator depresses these, the effect corresponding to each is switched between valid / invalid. 6e is an SE for setting the function of the envelope foot switch 6d.
The L switch is used to selectively set the function of giving an attack effect or shifting to the minimum volume. In addition, various operators for controlling the parameters of each effect are provided. The DSP is a display, and a level change such as volume is graphically displayed in real time based on the setting states of various switches. IN is an input terminal for taking in a musical sound to be given an effect by this device, and is connected to the input end of the A / D converter 8 in FIG. OUT is an output terminal for outputting a musical sound to which an effect is applied by this device.
Is connected to the output terminal of the D / A converter 9 in FIG. VPIN is an input terminal for taking the output signal from the volume pedal 5 into this device.

Next, the effect applying circuit 7 will be described with reference to the block diagram shown in FIG. In this figure, a distortion circuit 71 is a circuit for giving a so-called distortion effect to an input musical sound, and a tone color TONE set by a corresponding operator.
Based on parameters such as the above, a process of giving distortion to the waveform of the input musical tone is performed. The reverb circuit 73 is a circuit for adding a reverberation sound to the input musical sound, and the duration of the reverberation sound or the like is controlled by parameters such as the reverberation time TIME set by the corresponding operator. 72 is an equalizer circuit, which has a center frequency FREQ and a bandwidth BAND. The band pass characteristic for the input signal is determined by parameters such as WIDTH. Further, when the equalizer circuit 72 is designated as the output destination of the output signal of the volume pedal 5 by the switch on the operation panel 4 described above, the center frequency of the pass band of the equalizer circuit 72 is the depression amount of the volume pedal 5. The frequency is controlled according to. Reference numeral 74 denotes an envelope control circuit, which controls the volume such as adding an envelope waveform to the input musical tone signal.

The envelope control circuit 74 will be described in detail below with reference to the block diagram shown in FIG. FIG.
In the figure, 74a is a count pulse generation circuit, which outputs a count pulse CNTP having a frequency determined by the rate control signal SPEED. Here, the rate control signal SPEED may be given according to the operation amount of a specific operator, or may be given a fixed value. The trigger signal TRIGGER is "1" to "0" every time the operator depresses the foot switch 6d.
The value is inverted to, or from "0" to "1". 74b is a counter which counts the count pulse CNTP output from the count pulse generation circuit 74a and outputs the count value to the count address CNTAD.
Output as The counter 74b is reset when the trigger signal TRIGGER is "0", and reset when the trigger signal TRIGGER is "1". An envelope waveform memory 74c outputs volume data ENVDAT corresponding to the count address CNTAD output from the counter 74b. Here, FIG. 4 is a graph showing an example of the envelope waveform stored in the envelope waveform memory 74c, the horizontal axis shows the address designated by the counter 74b, and the vertical axis shows the volume data ENVDAT. As shown in this graph, the maximum value of the volume data ENVDAT is "1.
0 "and the minimum value is" 0.2 ". Volume data EN read from the envelope waveform memory 74c.
VDAT is multiplied by the tone signal INDAT input to the envelope control circuit.

Reference numeral 74e denotes an arithmetic circuit, which is a signal OUTPUT. LEVEL and the signal MIN. The LEVEL is fetched, a predetermined calculation described later is performed, and the calculation result is output. Normally, the output signal from the volume pedal 5 is the signal OUTPUT. LEV
It is input to the arithmetic circuit 74e as EL. However, when the output signal from the volume pedal 5 is input to the equalizer circuit 72 as the signal FREQ, the signal OUTP
UT. LEVEL is fixed to a predetermined value. 74d is a selector, and a select signal MIN. S
Take in EL. This select signal MIN. SEL is
Like the trigger signal TRIGGER described above, every time the operator depresses the foot switch 6d, "1" to "0"
The value is inverted to, or from "0" to "1". The selector 74d receives the select signal MIN. SE
The signal MIN.L input to the terminal A when L is "1". LE
VEL is selected and output, and otherwise, the calculation result of the calculation circuit 74e input to the terminal B is selected and output.
The output signal of the selector 74d is multiplied by the musical tone signal INDAT, and the calculation result is output from the envelope control circuit 74 as the musical tone signal OUTDAT.

Next, the general operation of this effect applying device will be described. When the power of this device is turned on, the CPU
1 executes a program whose flowchart is shown in FIG. First, in step S1, the CPU 1 performs a predetermined initialization process such as clearing the information temporarily stored in the RAM 3. Next, in step S2, the CPU 1 sequentially scans the state of the switch group of the operation panel 4 (including the switch for switching the output destination of the output signal from the volume pedal 5). Next, in step S3, the CP
U1 determines in step S2 whether or not a new setting has been made by the operator for each of the switches scanned. Here, if a new setting is made, the determination result of step S3 becomes "Yes", and the process proceeds to step S4. Next, when proceeding to step S4, the CPU 1
Sets a parameter corresponding to the newly set switch in a predetermined area of the RAM 3. In addition, the CPU 1 displays the display DSP according to the new setting state of the switch.
Change the display state of. Then, the process proceeds to step S5. On the other hand, if a new setting is not made by the switch group of the operation panel 4, the determination result of step S3 is "N.
“O” and does not proceed to step S4 but proceeds to step S5.

In step S5, the CPU 1 sequentially scans the states of the foot switches 6a to 6d corresponding to each effect. Next, in step S6, the CPU 1 determines whether or not the operator newly depresses each of the foot switches 6a to 6d scanned in step S5. Here, if a new step is made, the determination result of step S6 is "Yes", and the process proceeds to step S7. Going to step S7,
The CPU 1 switches the on / off state of the corresponding effect from the current state. Then, the process proceeds to step S8. If the foot switches 6a to 6d are not newly depressed, the determination result of step S6 is "N".
“O” and does not proceed to step S7 but proceeds to step S8.

When the process proceeds to step S8, the CPU 1 scans the volume pedal 5, and the current volume pedal 5 is scanned.
The output signal based on the depression amount of is assigned to the output destination set by the switch on the operation panel 4. That is, when the output destination set by the switch is the envelope control circuit 74, the output signal from the volume pedal 5 is input to the envelope control circuit 74 as the input signal O.
UTPUT. Supplied as LEVEL. On the other hand, when the output destination set by the switch is the equalizer circuit 72, the output signal from the volume pedal 5 is supplied to the equalizer circuit 72 as the input signal FREQ. Then, the process returns to step S2. In parallel with the operation described above, effects are added to the input musical sound based on the current setting state of various switches and the depression state of the volume pedal 5, such as enabling only the effect function that is turned on by the foot switch. Perform processing.

Next, the operation of the envelope control circuit 74 will be described. First, a case where the function of the foot switch 6d is set to give an attack effect by the SEL switch 6e will be described. When the operator depresses the foot switch 6d to change the state from the off state to the on state, the trigger signal TRIGGER changes from "0" to "1". As a result, the counter 74b is reset, and the counting operation is started in response to the count pulse given from the count pulse generation circuit 74a. This count value is output to the envelope waveform memory 74c as the count address CNTAD. As a result, the volume data ENVDA designated by the count address CNTAD
T is read from the envelope waveform memory 74c.
Further, the read tone volume data ENVDAT is multiplied by the tone signal INDAT. Here, even if the operator releases the foot switch 6d, the counter 74b continues counting until the entire memory word length of the envelope waveform memory 74c is read out. When the count advances until it becomes equal to the memory word length, the counter 74b stops its counting operation.

When the function of the foot switch 6d is set to shift to the minimum volume by the SEL switch 6e,
When the foot switch 6d is turned on, the select signal MIN. SEL becomes “1”. As a result, the selector 74d receives the signal MIN. LEV
Select EL and output. This output signal is a tone signal IN
DAT is multiplied and output from the envelope control circuit 74 as a tone signal OUTDAT having the minimum volume.

Next, the select signal MIN. When SEL does not become "1", that is, SEL switch 6e
In the case where the function of the foot switch 6d is set to give an attack effect or the function of the foot switch 6d is set to shift to the minimum volume,
The case where the foot switch 6d is off will be described. The selector 74d selects and outputs the calculation result of the calculation circuit 74e input to the terminal B. Here, the calculation result X of the calculation circuit 74e is the signal OUTPUT. LEVEL and signal M
IN. Based on the value of LEVEL, the conversion formula X = (MIN.LEVEL-1) * (1-OUTPUT.LEVEL) +1 (where 0≤MIN.LEVEL≤1.0, 0≤OUTPUT.LEVEL≤1.0) ... ……………………… given by (1). With this conversion formula, the calculation result X
MIN. LEVEL ≤ X ≤ 1.0 ……………………………………………………………………………………………………………… (2) For example, the minimum value of the set volume is MIN. LEVEL = 0.2 ............ (3), and the output depending on the amount of depression of the volume pedal 5 is OUTPUT. When LEVEL = 0.5 …………………………………… (4) When the expressions (3) and (4) are substituted into the expression (1), the operation result X is X = 0.6. …………………… (5). The calculation result is output from the selector 74d and then multiplied by the tone signal INDAT. Then, it is output from the envelope control circuit 74 as a musical tone signal OUTDAT having a volume corresponding to the depression amount of the volume pedal 5 to which no envelope is added.

Next, a case will be described in which the switch of the operation panel 4 is set so that the output signal from the volume pedal 5 is input to the equalizer circuit 72 as the signal FREQ. In this case, the envelope control circuit 7
4 input signal OUTPUT. Since the depression amount of the volume pedal 5 is not given to LEVEL, this value is fixed to "1". Therefore, it is impossible to control the volume with the volume pedal 5, but since the attack imparting function by the foot switch 6d and the function of shifting to the minimum volume can be used in the same manner, the volume pedal 5 can be replaced by another one. While assigning to the function of
It is possible to control the envelope of the output musical sound.

B: Second Embodiment Next, a second embodiment of the present invention will be described. The difference between this embodiment and the first embodiment described above is that the function selected by the SEL switch 6e shown in FIG.
As shown in, fade in to the sound (FADE IN)
This is because the function to add the effect of was added. With the addition of this function, a second envelope assigning unit E2 that is used by switching from the first envelope assigning unit E1 of the envelope control circuit 74 shown in FIG. 3 is added by selecting the SEL switch 6e. . When switching to the second envelope imparting unit E2, the foot switch 6d is used instead of the trigger signal TRIGGER.
An operation signal SW6D (described later) corresponding to the operation of is supplied.

Here, the second envelope imparting section E2
Is, as shown in FIG.
The same count pulse generation circuit 74a and counter 74b, rising detection circuit 74f, NOT circuit 74
g, an AND circuit 74h, and an envelope waveform memory 74c 'for storing an envelope that gives a tone a fade-in effect.

The rising detection circuit 74f is an operation signal SW which changes from "0" to "1" in response to depression of the foot switch 6d and "1" to "0" in response to release of depression.
The rising edge of 6D is detected, and the counter 74b is reset in response to this rising edge. Also, a NOT circuit 74g
Inverts the operation signal SW6D and outputs it to the AND circuit 7
Supply to 4h. Further, the AND circuit 74h is NOT
The output of the circuit 74g and the output of the count pulse generation circuit 74a are ANDed, and the result is supplied to the counter 74b as a clock signal.

Further, the envelope waveform memory 74c 'stores an envelope waveform which smoothly changes from level "0" to level "1.0" as shown in FIG. Has been done.

The operation of this embodiment will now be described with reference to the signal timing chart shown in FIG. First, S
Fade in (FADE I
Foot switch 6 when the function N) is selected
When d is stepped on, the operation signal SW6D changes from "0" to "1" (HU in the drawing).

At this time, the rising edge of the operation signal SW6D is detected by the rising edge detection circuit 74f, and the counter 74b is reset. As a result, the read address of the envelope waveform memory 74c 'is returned to "0", and the output volume data ENVDAT becomes "0" (LD shown in the figure). When the operation signal SW6D changes from "0" to "1", "0" is supplied to the AND circuit 74h via the NOT circuit 74g. As a result, the output of the AND circuit 74h becomes "0".

After that, when the foot switch 6d is continuously depressed, the operation signal SW6D is always "1", so that "0" is continuously supplied to the AND circuit 74h. As a result, the output of the AND circuit 74h is always "0", and the clock signal is not supplied to the counter 74b. That is, while the foot switch 6d is continuously depressed (T in the figure), the counter 74b is reset and does not perform the counting operation.
The read address of c'is always "0". As a result, the volume data ENVDAT output from the envelope waveform memory 74c 'is always "0" while the depression is continued (LC in the figure).

When the foot switch 6d is released, the operation signal SW6D changes from "1" to "0", and A
"1" is supplied to the ND circuit 74h. As a result, the count pulse output from the count pulse generation circuit 74a is supplied to the counter 74b as a clock signal. As a result, the counter 74b starts the counting operation, and the volume data ENVDAT corresponding to the envelope shown in FIG. 9 is outputted from the envelope waveform memory 74c '.
Is read (FD in the figure).

The volume data ENV thus read out
By multiplying the tone signal INDAT by DAT,
The volume level of the musical sound gradually increases from the level “0”, and the effect of fade-in is added. After that, the counter 74b
The read address by the envelope waveform memory 7
When the volume data ENVDAT of 4c reaches a predetermined address where "1.0" is reached, the count operation is stopped at that address. As a result, the volume data ENV of the value "1.0" is maintained until the next stepping on the foot switch 6d.
DAT is output.

As described above, according to the second embodiment, S
Fade in (FADE I
When the function N) is selected, the foot switch 6d
The volume level of the musical sound becomes "0" by the stepping operation of, and when the stepping operation is released, the volume level gradually increases, and the effect of fading in to the musical sound is obtained. On the other hand, when the function of applying the attack effect or shifting to the minimum volume is selected by the SEL switch 6e, the first envelope applying section E1 is replaced by the first envelope applying section E1 in the envelope control circuit 74 in place of the second envelope applying section E2. It is used and operates similarly to the first embodiment.

The conversion formula of the operation performed by the operation circuit 74e is not limited to that shown in the above-mentioned embodiment, and various changes can be made. Further, in the above embodiment, the envelope for changing the volume with time is read from the envelope waveform memory 74c, but the present invention is not limited to this, and the envelope may be obtained by calculation. Further, the above-described embodiment may be configured by hardware or may be programmed by software.

[0030]

As described in the foregoing, according to the present invention, it is connected to an external instrument, the effect impartment apparatus which gives an effect to the musical tone output from the musical instrument, before
Switch means for instructing addition of volume change to musical note
According to the instruction of the switch means,
Regardless of the generation start of the musical tone, providing a volume change applying means for applying a temporal change of a predetermined the volume of the musical tone, by the volume change imparting means, the volume of the musical tone, the second from the first predetermined value Gradually decreases to the second predetermined value, and as soon as the second predetermined value is reached, the second predetermined value gradually increases to the first predetermined value. On the other hand, since it is possible to change the sound volume for a predetermined time by the switch operation, it is possible to obtain the effect of the sound volume change, which has conventionally required a high performance technique, by a simple operation. Further, it is possible to obtain the effect that the volume can be changed by operating the switch without operating the operator such as the volume pedal. Furthermore, an effect can be obtained in which a musical sound output from an external musical instrument can be muted once and then immediately reproduced again. Furthermore, the present invention
And instrument are separate devices, and their operation is also
Since it is performed independently, according to the present invention, the reappearance of musical sounds
The sound can be reproduced by re-operating the above-mentioned musical instrument.
It is also possible to operate only the switch means of the invention. this
Allows you to switch while the musical tone is being generated by an external instrument.
Operation of the external device does not
Change the tone volume as if the instrument was re-pronounced
Can be done.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an effect imparting device according to a first embodiment of the present invention.

FIG. 2 is an effect imparting circuit 7 included in this device.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 3 is a block diagram showing a configuration of an envelope control circuit 74 forming a part of the effect applying circuit 7.

FIG. 4 is a graph showing an example of envelope waveforms stored in an envelope waveform memory 74c of an envelope control circuit 74.

FIG. 5 is an external view of this device.

FIG. 6 is a flowchart of a program executed by the CPU 1.

FIG. 7 is an external view showing the configuration in the vicinity of the SEL switch 6e of the effect imparting device according to the second embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of an envelope giving unit E2 selectively connected to the envelope control circuit 74 according to the same embodiment.

FIG. 9 is an envelope waveform memory 74 according to the same embodiment.
It is a graph which shows an example of the envelope waveform memorize | stored in c '.

FIG. 10 is a diagram showing an operation signal SW6D and an envelope signal (volume data ENVD) of the foot switch 6d according to the embodiment.
FIG. 6 is a timing diagram showing the (AT).

[Explanation of symbols]

1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... operation panel, 5 ... volume pedal, 6 ... foot switch group, 7 ... effect applying circuit, 8 ... A / D converter, 9 ... D / A converter, 10 ... Panel interface, 11 ... Pedal interface, 12 ... Switch interface, 13 ... Bass, 71 ... Distortion circuit, 72 ... Equalizer circuit, 73 ... Reverb circuit, 74 ... Envelope control circuit, 74a ... Count pulse generation circuit, 74b ... Counter, 74c,
74c '... Envelope waveform memory, 74d ... Selector, 74e ... Arithmetic circuit, 74f ... Rise detection circuit, 74g ... NOT circuit, 74h ... AND circuit,
E1, E2 ... Envelope giving section

Claims (1)

(57) [Claims] 1. An effect applying device which is connected to an external musical instrument and which gives an effect to a musical tone output from the musical instrument, wherein a switch hand for instructing to give a volume change to the musical tone.
And a musical sound produced by the musical instrument in response to an instruction from the switch means.
Start of occurrence and independently, comprises a volume change applying means for applying a predetermined temporal change in the volume of the musical tone, by the volume change imparting means, the volume of the musical tone, the first
Is gradually decreased from a predetermined value of 2 to a second predetermined value, and as soon as the second predetermined value is reached, it is gradually increased from the second predetermined value to the first predetermined value. Effect applying device.