JPH06289871A - Effect adding device - Google Patents

Abstract

PURPOSE:To provide the effect adding device which neither breaks a sound even at the time of effect switching nor gives a unnatural feeling even when effects are switched during musical performance. CONSTITUTION:This device is equipped with a signal path through which an input musical sound signal is outputted as it is and/or a signal path through which the signal is outputted after specific effects are added and the musical sound signal outputted from those signal paths are put together and outputted. This effect adding device after attenuating the signal level of a signal path where effects are switched switches the effect by replacing an effect program and then raises the signal level of the signal path to a specific value again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effect imparting device for imparting a musical effect to a musical tone signal, and more particularly to an effect imparting device capable of naturally switching effects.

[0002]

2. Description of the Related Art Conventionally, there has been known an effect imparting device for imparting a musical effect (for example, reverb or chorus) to a musical tone signal. In particular, in recent years, an effect imparting device for imparting an effect to a musical tone has been used by subjecting a digital musical tone signal to digital signal processing using a DSP (digital signal processor) storing a microprogram. There is.

FIG. 9 is a schematic diagram showing a conventional effect imparting circuit. The effect imparting circuit of this figure is a DSP and its DSP.
It is simulated by the microprogram stored in. 9
Reference numeral 01 is a circuit schematically showing the function realized by the microprogram stored in the DSP.

In this figure, the input musical tone signal (digital signal) is input to the effect calculation section 902. The effect calculation section 902 gives an effect to the input musical tone signal. On the other hand, the input musical tone signal is multiplied by the constant DB in the multiplication unit 903, and the multiplication result is input to the addition unit 905. Effect calculator 9
The output of 02 (the output to which the effect is added) is the multiplication unit 904.
Is multiplied by a constant WB, and the multiplication result is input to the addition unit 905.

The adder 905 adds these input signals. The multiplication unit 906 multiplies the addition result of the addition unit 905 by a gain G, and outputs the multiplication result as a musical tone signal with an effect added.

The gain G is a multiplier for volume adjustment and is a multiplier controlled by a CPU (central processing unit) not shown.

[0007]

By the way, in the conventional effect imparting circuit as described above, the signal processing from the input to the output is described by the DSP microprogram 901. It is necessary to change (replace) the microprogram 901. When changing the microprogram 901, the volume is reduced by a multiplying unit 906 or the like outside the DSP, the microprogram 901 is changed, and then the volume is raised again.

Therefore, there is a problem in that the sound is interrupted for a moment when the effect is switched, and if the effect is switched during the performance, the performance sound becomes unnatural.

In view of the problems in the above-mentioned conventional example, the present invention does not interrupt the sound even when the effect is switched,
An object of the present invention is to provide an effect imparting device that does not give an unnatural feeling even if the effect is switched during a performance.

[0010]

To achieve this object, the present invention comprises a signal path for directly outputting an input musical tone signal and / or a signal path for imparting a predetermined effect and outputting the signal. An effect imparting device for synthesizing and outputting a musical tone signal output from a path, comprising signal level control means for controlling the signal level of each signal path, and effect switching means for switching an effect imparted to an input musical sound signal. After damping the signal level of the signal path for which the effect should be switched, the effect is switched, and the control means for controlling again to raise the signal level of the signal path to a predetermined value is provided.

Specifically, it is provided with a signal path for outputting the input musical tone signal as it is and / or a signal path for imparting an effect to the input musical tone signal by using an effect imparting means in which a predetermined effect imparting program is stored. , An effect imparting device for synthesizing and outputting the tone signals output from each of these signal paths, the signal level control means for controlling the signal level of each of the signal paths, and the program exchange for exchanging the effect imparting program Means and the signal level control means of the signal path according to the effect imparting program to be replaced, the signal level of the signal path is set to 0, the effect imparting program is replaced by the program replacing means, and the signal level of the signal path is again set to the predetermined level. An effect switching control means for controlling so as to raise the value may be provided.

Further, there is provided an effect imparting means in which one or more effect imparting programs for imparting an effect and one or more wire connecting programs for defining the input / output wiring relation of the effect imparting program are stored. A level control means for controlling the signal level of the input and / or output of the connection program, a program replacement means for replacing the effect application program, and an input and / or output of the effect application program to be replaced. After the signal level of the signal path is set to 0 by using the level control means of the connection program involving the signal path, the effect application program is replaced by the program replacement means, and the signal level of the signal path is again set to the predetermined value. You may make it provided with the effect switching control means which controls to raise to

[0013]

The effect is switched by attenuating the signal level of the signal path related to the effect to be switched, so that the signals of other signal paths continue to be output. Therefore, the sound is not interrupted. In particular, it is advisable to raise the signal level of the other signal paths to a predetermined value so that the volume level as a whole does not change.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows a block configuration of an effect imparting device according to the first embodiment of the present invention. The apparatus shown in this figure includes a panel switch (SW) 101, a panel SW interface 102, a CPU 103, a random access memory (RAM) 104, and a read only memory (ROM).
105, an analog-digital converter (ADC) 106,
DSP 107, delay RAM 108, digital-analog converter (DAC) 109, and sound system 1
Equipped with 10. These respective units are connected to each other by a bus line 111.

FIG. 1B shows the appearance of part of the panel SW101. In particular, the switches 121 to 125 for changing the setting of the effect are illustrated. By pressing these switches, it is possible to set and change the effect added to the musical sound. For example, when the switch 121 is pressed, the reverb effect is added to the musical sound and the musical sound is output. When the switch 122 is pressed, the chorus effect is added to the musical sound and the musical sound is output. The effect may be changed while a musical sound is being output during the performance.

The panel SW interface 102 is an interface for detecting an operation of the panel SW 101 and sending the operation information to the CPU 103 via the bus line 111. The CPU 103 controls the operation of the entire effect imparting device. In particular, when an effect changing operation is performed by the panel SW101, the effect changing process is performed.

The RAM 104 is used for various work areas. The ROM 105 stores programs executed by the CPU, microprograms for giving effects, and the like.

The ADC 106 converts an input musical tone signal which is an analog signal into a digital signal. The input musical tone signal, which is a digital signal, is input to the DSP 107. D
A microprogram for effect addition is loaded in SP107. The DSP 107 operates according to the microprogram, internally performs various calculations (digital signal processing), adds an effect to the input musical tone signal, and outputs the signal. The delay RAM 108 is a RAM used when delaying various signals.

The effect-added musical tone signal output from the DSP 107 is converted into an analog signal by the DAC 109 and emitted by the sound system 110.

FIG. 2 shows the contents (a part) of the ROM 105. The ROM 105 stores a micro program loaded into the DSP 107. 201 is the effect EF
A microprogram for giving 1 (hereinafter referred to as an effect program), 202 is an effect program for giving an effect EF2, 203 is an effect program for giving an effect EF3, ....

Reference numeral 211 denotes an input / output control program which is also a microprogram loaded in the DSP 107. The input / output control program 211 is the DSP 10
It is a program that particularly defines the input / output relation or the connection relation among the effect imparting operations by 7. This will be described later with reference to FIG.

FIG. 3 shows the DSP 107 in this embodiment.
It is a schematic diagram showing the effect provision circuit simulated by. Thirty
Reference numeral 1 is a circuit schematically showing a function to be simulated by a microprogram stored in the DSP 107.

In this figure, the input musical tone signal is input to the effect calculation section 302. The effect calculation section 302 gives an effect to the input musical tone signal. On the other hand, the input tone signal is
The multiplication unit 303 multiplies the constant DB and the multiplication result is input to the addition unit 305. The output of the effect calculation unit 302 (output to which the effect is added) is multiplied by the constant WB in the multiplication unit 304, and the multiplication result is input to the addition unit 305. Adder 305
Adds these input signals and outputs the addition result as an effect-added musical tone signal.

As mentioned above, the circuit 301 of FIG.
P107 is a simulated circuit, so
When the 107 executes the microprogram, the above-described operation from input to output is executed. The microprogram is loaded in the microprogram RAM 310 (402 in FIG. 4, which will be described later) inside the DSP 107.

In particular, in this embodiment, the effect calculation section 302
Effect program 311 for fulfilling the function of
The input / output control program 312 for performing the functions of the parts other than the effect calculation unit 302 is clearly separated. Since they are divided in this way, only the effect program is replaced and the input / output control program is not replaced when the effect is switched.

The DSP 107 first executes the effect imparting process by the effect calculation section 302 by sequentially reading and executing the effect program 311 on the microprogram RAM 310, and then the input / output control program 312.
Is sequentially read and executed to execute the input / output processing in the input / output wiring relationship as shown in the figure.

One of the effect programs 201, 202, ... Stored in the ROM 105 of FIG. 2 is loaded and used as the effect program 311 of FIG. What is loaded in the initial state immediately after the power is turned on is predetermined, and thereafter, an effect program corresponding to the effect selected by the user on the panel SW 101 (FIG. 1B) is loaded. Also, what is loaded as the input / output control program 312 in FIG. 3 is the input / output control program 211 in FIG.

FIG. 4 shows a detailed block configuration of the DSP 107. The DSP 107 includes an interpolator 401, a microprogram RAM 402, a read control unit 403, and a calculation unit 404. A temporary RAM (TRAM) 405 for temporary storage is provided inside the arithmetic unit 404.

The microprogram RAM 402 (numbered 310 in FIG. 3) is loaded with a microprogram to be executed by the arithmetic unit 404. This load is CPU
It is performed via the bus line 111 under the control of 103. The microprogram is stored in the ROM 105 as described with reference to FIGS.

The read control unit 403 sequentially outputs the read address of the microprogram loaded in the microprogram RAM 402 in response to the clock signal φ1. The microprogram read by the read address is sequentially input to the arithmetic unit 404.

An arithmetic processing unit that performs arithmetic operations such as addition and multiplication is provided inside the arithmetic unit 404. Arithmetic unit 4
By operating in accordance with the input microprogram, 04 performs various kinds of digital signal processing on the input musical tone signal to give an effect and output.

The interpolator 401 interpolates various constants given to the calculation unit 404. For example, although the multiplication units 303 and 304 are shown in the schematic diagram of FIG.
Is set by the interpolator 401. For example, if the current value of the multiplier DB is DB1 and it is desired to change this to DB2, the following is performed.

First, the CPU 103 sends the target value DB2 of the multiplier DB to the interpolator 401 of the DSP 107. The interpolator 401 is provided with a register for storing target values of various constants, and DB2 is set in the register for storing target values of the multiplier DB. When the target value is set, the interpolator 401 interpolates the current value DB1 to the target value DB2, and outputs a value that gradually approaches the target value DB2 as a multiplier DB. The calculation unit executes multiplication by using this value output from the interpolator 401 as the multiplier DB. After a lapse of a predetermined time, the output of the interpolator 401 reaches the target value DB2, and thereafter, the value of the multiplier DB becomes DB2.

FIG. 5A shows a main routine (operation of the CPU 103) of the effect imparting apparatus of this embodiment.

First, when the power is turned on, initialization is performed in step S1. Next, in step S2, the effect program (one of 201, 202, ... In FIG. 2) that is initialized is read from the ROM 105 and loaded into the microprogram RAM 402 of the DSP 107. As a result, the effect program 311 shown in FIG. 3 is loaded.

Next, in step S3, the input / output control program (211 in FIG. 2) is read from the ROM 105, and the DS
It is loaded into the microprogram RAM 402 of P107. As a result, the input / output control program 3 shown in FIG.
12 has been loaded.

In step S4, it is determined whether or not the effect has been selected by the panel SW101 (that is, whether or not the switch shown in FIG. 1B has been pressed). If no effect is selected, other processing is performed in step S11, and the process returns to step S4.

When the effect is selected in step S4, the target value of the multiplier WB of the interpolator 401 is set to 0 in step S5. In step S6, the interpolator 401
The target value of the multiplier DB of is set to a predetermined value A.

FIG. 5B is a graph showing the operation of the interpolator 401 in this embodiment. For some coefficient,
At time t1, the current value is L1, and when the target value is set to 0 here, the interpolator 401 sequentially outputs values that gradually decrease to the target value 0 as shown in this graph. When the predetermined time T has elapsed, the current value becomes 0. The interpolation time T can be set in advance. Also,
In this embodiment, the interpolation curve that linearly increases and decreases toward the target value is used, but other interpolation curves may be used. Any interpolation method may be used.

Next, in step S7, the process waits until the interpolation is completed. That is, it waits for the interpolation time T. As a result, the multiplier WB becomes 0 and the multiplier DB becomes the predetermined value A. Therefore, as can be seen from FIG. 3, only the route for directly outputting the input musical tone signal is effective, and the signal level is 0 for the route to which the effect calculation unit 302 applies the effect.

Next, in step S8, an effect program corresponding to the selected effect is read from the ROM 105 and loaded into the microprogram RAM 402 of the DSP 107. As a result, the effect program 311 shown in FIG. 3 has been replaced.

Then, in step S9, the target value of the multiplier DB of the interpolator 401 is set to the predetermined value B, and in step S10 the target value of the multiplier WB of the interpolator 401 is set to the predetermined value C. As a result, the multiplier DB becomes the predetermined value B and the multiplier WB becomes the predetermined value C after the lapse of the predetermined time. Next, step S1
Other processing is performed at 1, and the process returns to step S4.

According to the above embodiment, the multiplication unit 304 of FIG.
The multiplier of is set to 0, the multiplier of the multiplication unit 303 is set to A, the microprogram related to the effect calculation unit 302 is changed, and thereafter, the multipliers of the multiplication units 303 and 304 are set to B and C, respectively. Therefore, the sound is not interrupted when switching the effect, and the sound does not become unnatural. In addition, the multiplication unit 30
Since the multiplier of 3,304 is made to gradually approach the target value by the interpolator 401, the effect switching is performed smoothly.

It is preferable that the value of the predetermined value A is selected so that the entire volume level does not change before and after the multiplier of the multiplication unit 304 is set to 0, since the effect is naturally switched. Further, in the above embodiment, an example in which the function as shown in FIG. 3 is simulated by the DSP 107 and the micro program is shown, but the circuit to be simulated is not limited to this. Effect calculation unit 302
There may be a plurality of lines, and the wiring relationship may be more complicated.

Next, an effect imparting device according to the second embodiment of the present invention will be described. The configuration of the apparatus of this embodiment is shown in FIG.
Is the same as. The configuration of the DSP 107 is also the same as in FIG.

FIG. 6 is a schematic diagram showing an effect application circuit simulated by the DSP 107 and a microprogram in the effect application apparatus of this embodiment. The microprogram loaded into the DSP 107 is the connection program 610,
Effect program 620, connection program 630,
Effect program 640 and connection program 6
50. Hereinafter, the operation of these programs will be described with reference to FIG.

In FIG. 6, RIN, RA, RB, RT
Reference numerals 1 and RT2 denote registers used for data transfer. These registers are the TRAM in the DSP of FIG.
It is secured in 405.

First, in the connection program 610,
The input digital musical tone signal INPUT is registered in the register RI.
Set to N. The multiplication unit 611 multiplies the value of the register RIN by a constant C1. The multiplication unit 612 uses the register RB
The value of (output of effect program 640) is a constant C2
Is multiplied by. The addition unit 613 adds the multiplication results of the multiplication units 611 and 612, and adds the addition results to the register RT.
Set to 1.

Next, in the effect program 620, the effect adding section 621 adds a predetermined effect EF1 to the value of the register RT1. The result of applying the effect is set in the register RA.

In the connection program 630, the multiplication unit 6
31 multiplies the value of the register RIN by a constant C3. The multiplication unit 632 uses the register RA (effect program 6
20 output) value is multiplied by a constant C4. Adder 633
Adds the multiplication results of the multiplication units 631 and 632, and sets the addition result in the register RT2.

In the effect program 640,
The effect adding unit 641 adds a predetermined effect EF2 to the value of the register RT2. The result of applying the effect is register R
Set to B.

In the connection program 650, the multiplication unit 6
51 multiplies the value of the register RIN by a constant C5. The multiplication unit 652 multiplies the value of the register RA by a constant C6. The multiplication unit 653 multiplies the value of the register RB by the constant C7. The addition unit 654 includes a multiplication unit 651 and a multiplication unit 652.
And the multiplication result of the multiplication unit 653 is added, and the addition result is output as the effect-added musical tone signal OUT.

FIG. 7 shows the microprogram RAM of FIG.
FIG. 4 is a diagram showing a state in which a micro program is loaded in 402. In the microprogram RAM 402, FIG.
A wiring program 610, an effect program 620, a wiring program 630, an effect program 640, and a wiring program 650 that simulate the circuit of FIG.

These microprograms are represented by R in FIG.
It is stored in the OM 105. In particular, the effect programs 620 and 640 can be used by exchanging the effect programs for imparting various effects (reverb, chorus, flanger, etc.) in the ROM 105.

According to the circuit example as shown in FIG. 6, it is possible to flexibly change the wiring method of the effect imparting section. For example, in FIG. 6, C1 = 1, C2 = 0, C3 = 0, C4 = 1, C5 =
If 1, C6 = 0 and C7 = 1, the circuit is equivalent to the circuit of FIG. Further, in FIG. 6, C1 = 0, C2 =
1, C3 = 1, C4 = 0, C5 = 1, C6 = 1, C7 =
When it is set to 0, it is equivalent to the circuit of FIG. further,
In FIG. 6, C1 = 1, C2 = 0, C3 = 1, C4 =
If 0, C5 = 1, C6 = 1, and C7 = 1, then FIG.
It is equivalent to the circuit of (c).

As described above, by properly setting the values of the constants C1 to C7, the DSP 107 can simulate various circuits.

The procedure for switching the effect in this embodiment is the same as that in FIG. 5 (a). First, steps S1 to S
Initial setting is made in 3. As a result, the microprograms 610 to 650 are loaded into the microprogram RAM 402 as shown in FIG. The programs loaded as the effect programs 620 and 640 are defined as those to be initialized in advance.

Next, when an effect is selected, the effect program is changed as in steps S5 to S10. For example, a case in which the effect program 620 is changed to the distortion program while the reverb program is loaded in the effect program 620 and the chorus program is loaded in the effect program 640 will be described below.

First, the target values of the constants C4 and C6 are set to 0, and the values of these constants are gradually decreased. Other constants C1, C
2, ... is raised to a predetermined target value so that the overall volume does not change. When a change in these constants is stopped after waiting for a predetermined time, a distortion program is loaded as the effect program 620. If necessary, coefficient information is also set. Next, the constants C4 and C6
Are gradually increased to the respective predetermined target values, and other constants C
1, C2 ... Are also lowered to predetermined target values.

From the above, without interrupting the sound,
The effect program 620 can be switched. In particular, since it is possible to switch only a part of the effects to another effect, for the other effects, the sound to which the effect is applied is continuously output, and a natural effect switching can be realized.

Furthermore, in this embodiment, the effect program is not loaded, and the connection from FIG.
Also when switching to the wiring of (c), the sound is not interrupted if only the direct sound (the one in which the input musical tone signal is directly output) is switched.

If the CPU 103 sets an appropriate target value, the connection can be smoothly switched from the connection before switching to the connection after switching without interruption.
For example, when switching from the connection of FIG. 8A to the connection of FIG. 8C, gradually change C3 from 0 to a predetermined value, C4 from a predetermined value to 0, and C6 from 0 to a predetermined value. You can do this.

In this embodiment, each effect program and connection program always use a fixed register for data transfer. Then, after the signal processing, the data must be stored in another predetermined register.

However, for example, if the effect program 620 of FIG. 6 is fixed such that data is input from the register RT1 and the processing result is stored in the register RA, the program loaded as the effect program 620 (input Is RT1 and output is RA)
And a program to be loaded as the effect program 640 (input is RT2, output is RB), two types of programs must be prepared. It is uneconomical to prepare two types of programs that have almost the same contents but different register addresses.

Therefore, each microprogram stores a relative address by RT1 = (input register address) + (input register offset address for EF1) RA = (output register address) + (output register offset address for EF1). Incidentally, it is advisable to add the offset addresses differently depending on whether EF1 (load as the effect program 620) or EF2 (load as the effect program 640) is loaded. By doing so, it is not necessary to prepare two types of programs.

In the second embodiment, the example of simulating the circuit of FIG. 6 has been described, but the circuit to be simulated is not limited to this.
You can use more effect programs,
A more complicated wiring program may be used.

Further, in the above-described embodiment, the effect is switched after the level is set to 0. However, the present invention is not limited to this, and even if the effect is switched after the level is lowered to some extent, it is unnatural to the sense of hearing. I won't.

[0069]

As described above, according to the present invention, the signal level of the signal path relating to the effect switching is attenuated to switch the effect, and then the signal level of the signal path is raised to a predetermined value. As a result, the sound will not be interrupted even when the effects are switched, and even if the effects are switched during performance, there will be no unnatural feeling.

[Brief description of drawings]

FIG. 1 is a block configuration diagram and partial panel external view of an effect imparting device according to a first embodiment of the present invention.

FIG. 2 is a memory structure diagram showing a part of the contents of a ROM.

FIG. 3 is a schematic diagram showing a circuit simulated by a DSP.

FIG. 4 is a detailed block diagram of the DSP.

FIG. 5 is a flowchart of a main routine of the device according to the first embodiment.

FIG. 6 is a schematic diagram showing an effect imparting circuit simulated by a DSP in the second embodiment.

FIG. 7 is a diagram showing a state where a program is loaded in a micro program RAM.

FIG. 8 is a diagram showing an example of an effect imparting circuit simulated by a DSP in the second embodiment.

FIG. 9 is a schematic diagram showing a conventional effect imparting circuit.

[Explanation of symbols]

101 ... Panel switch (SW), 102 ... Panel SW
Interface, 103 ... CPU, 104 ... RAM,
104 ... ROM, 106 ... ADC, 107 ... DSP, 1
08 ... RAM for delay, 109 ... DAC, 110 ... Sound system, 111 ... Bus line, 401 ... Interpolator, 4
02 ... Microprogram RAM, 403 ... Read control unit, 404 ... Arithmetic unit, 405 ... Temporary RAM (TR
AM).

Claims (1)

[Claims] 1. An effect imparting device comprising a signal route for outputting an input musical tone signal as it is and / or a signal route for imparting a predetermined effect and outputting the synthesized musical tone signal outputted from each of these signal routes. A device, which comprises a signal level control means for controlling the signal level of each of the signal paths, an effect switching means for switching an effect given to an input musical tone signal, and a signal level of a signal path for switching the effect after being attenuated. An effect imparting device, comprising: a control unit that switches the effect and controls the signal level of the signal path again to a predetermined value.