Analog effector for electronic musical instrument

Abstract

To provide an analog effector for electronic musical instrument whose imitation is difficult to be manufactured.SOLUTION: An analog effector for electronic musical instrument 10 includes a first circuit 100, a second circuit 200, and a magnetic body 300. The first circuit 100 detects a signal for determining a degree of effect and sets a signal of a magnetic field to be an output signal. The second circuit sets the signal of the magnetic field to be an input signal and outputs a signal for applying effect. The magnetic body 300 connects output of the first circuit 100 and input of the second circuit 200. A portion in which the second circuit 200 detects the input signal of the magnetic field may be an electric wire having a resistance value between the electric wire and the ground.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an analog effect for electronic musical instruments.

Background Art

[0002] Patent Documents 1 to 3 and the like are known as the prior art of effects for electronic musical instruments. These prior arts adjust the timbre by adjusting the frequency characteristics of the acoustic signal.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the prior art is composed of electronic circuits, there is a problem that it is easy to create a counterfeit product having the same frequency characteristics by performing reverse engineering of the electronic circuit. In particular, even in the case of a timbre obtained by trial and error of parameters (resistance value, capacitance, etc.) of components of an electronic circuit, if reverse engineering of the electronic circuit is performed, information on the parameters can be obtained without trial and error. Therefore, an object of the present invention is to provide an analog effect for electronic musical instruments that is difficult to create a counterfeit product.

Means for Solving the Problems

[0005] The analog effector for electronic musical instruments of the present invention includes a first circuit, a second circuit, and a magnetic body. The first circuit detects a signal that determines the degree of the effect and outputs a magnetic field signal as the output signal. The second circuit uses the magnetic field signal as the input signal and outputs a signal that provides the effect. The magnetic body couples the output of the first circuit and the input of the second circuit.

Advantages of the Invention

[0006] According to the analog effector for electronic musical instruments of the present invention, a magnetic body is used. Since it is difficult to specify the characteristics of the magnetic body, even if the parameters of the electronic circuit part are known, the tone color cannot be reproduced. In order to reproduce a similar tone color in a counterfeit product, trial and error of the parameters (resistance value, capacitance, etc.) of the components of the electronic circuit is required. Therefore, it is difficult to create a counterfeit product.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described in detail. Note that components having the same function are assigned the same number, and redundant descriptions are omitted.

Examples

[0009] Fig. 1 shows an example of the functional configuration of the effector of the present invention. The effector 10 is an analog effector for electronic musical instruments. The effector 10 includes a first circuit 100, a second circuit 200, a magnetic body 300, an acoustic signal processing unit 400, and a synthesizing unit 500. The acoustic signal processing unit 400 appropriately applies processing based on the prior art to the acoustic signal input from the input terminal 11 of the effector 10. The processing to be applied may include processing that affects the frequency characteristics, processing for adjusting the volume, etc., and in addition to the predetermined processing, processing based on an instruction from the user may be performed.

[0010] The first circuit 100 detects a signal that determines the degree of the effect and outputs a magnetic field signal as an output signal. The second circuit 200 takes the magnetic field signal as an input signal and outputs a signal that gives an effect. The magnetic body 300 couples the output of the first circuit 100 and the input of the second circuit 200. The output from the second circuit 200 is synthesized with the output from the acoustic signal processing unit 400 by the synthesizing unit 500, and an acoustic signal is output from the output terminal 12.

[0011] In the example of Fig. 1, the first circuit 100 includes a signal detection unit 110, an amplification unit 120, and a magnetic field generation unit 130. The signal detection unit 110 detects a signal that determines the degree of the effect and outputs an alternating current signal for adjusting the degree of the effect. The amplification unit 120 outputs a current corresponding to the output of the signal detection unit 110. The magnetic field generation unit 130 generates an output signal of a magnetic field according to the current output by the amplification unit 120. The magnetic field generation unit 130 may generate an output signal of a magnetic field with a coil 131. For example, a coil of about 500 mH may be used. However, instead of the coil 131, only an electric wire and a resistor may be arranged to generate a magnetic field with the electric wire.

[0012] Examples of the signal detected by the first circuit 100 include an acoustic signal that gives an effect (the acoustic signal input from the input terminal 11), the current supplied by the DC power supply of the effector 10, a signal input from the outside, etc. The "signal input from the outside" is a signal that changes by an operation such as a lever performed by the user.

[0013] Fig. 2 shows a configuration example of the first circuit 100 when detecting an acoustic signal (the acoustic signal input from the input terminal 11) that affects Fig. 2. The signal detection unit 110 in Fig. 2 is an electric wire connecting the input terminal 11 and the amplification unit 120. Fig. 3 shows a first configuration example of the first circuit 100 when detecting the current supplied by the DC power supply of the effector 10. In this configuration example, a resistor 111 with a small value is inserted into the electric wire that supplies power from the DC power supply 600 to the circuit in the effector 10, and the circuit that detects the voltage between the resistors 111 is the signal detection unit 110. Fig. 4 shows a second configuration example of the first circuit 100 when detecting the current supplied by the DC power supply of the effector 10. This example of the first circuit 100 has a simple structure in which only a coil 131 is inserted into the electric wire that supplies power from the DC power supply 600 to the circuit in the effector 10. The coil 131 detects the signal (current) that determines the degree of the effect and generates a magnetic field signal. Fig. 5 shows a configuration example of the first circuit 100 when detecting a signal input from the outside. In the example of Fig. 5, the signal detection unit 110 is composed of a variable resistor 112 connected to an AC power supply. By operating a lever or the like, the amplitude output from the variable resistor 112 changes. Note that by operating a lever or the like, the frequency of the AC power supply may be changed, or both the frequency and the amplitude may be changed. Figs. 2 to 5 show configuration examples of the first circuit 100, and it is not necessary to limit to these configurations. Other configurations are also acceptable.

[0014] The second circuit 200 includes a magnetic field input unit 230, an amplification unit 220, and an effect generation unit 210. The magnetic field input unit 230 is a part that detects an input signal of a magnetic field. The magnetic field input unit 230 detects a change in the magnetic field generated by the magnetic field generation unit 130 transmitted through the magnetic body 300 and converts it into a voltage. The magnetic field input unit 230 may be an electric wire 232 having a resistance value between it and the ground. For example, it may be composed of a resistor 231 with one end grounded and an electric wire 232 connected to the other end of the resistor 231, or a configuration in which an object (resistor) having a resistance value is interposed between the electric wire 232 and the ground. That is, the resistor 231 may be a general resistor used in an electric circuit or an object having a resistance value such as a pickup of an electric guitar. Since a current is generated due to the change in the magnetic field and a voltage corresponding to the resistance is generated, the resistor 231 may have a predetermined high resistance value. For example, if the resistance value is such as 1 MΩ to 10 MΩ, it is easy to increase the output voltage. Of course, the magnetic field input unit 230 may include a coil, but it is not an essential component for effect generation. The amplification unit 220 amplifies the voltage output by the magnetic field input unit 230. The effect generation unit 210 outputs a signal that gives an effect based on the output of the amplification unit 220.

[0015] The magnetic body 300 propagates the magnetic field generated (output) by the magnetic field generation unit 130 of the first circuit 100 to the magnetic field input unit 230 of the second circuit 200. A plate-shaped magnetic body may be used for the magnetic body 300. The plate-shaped magnetic body may be disposed, for example, on the inner surface side of the housing of the effector 10.

[0016] FIG. 6 is a diagram showing an image of an equivalent circuit of a configuration using a magnetic material. The above-described configuration using the magnetic material 300 mainly serves as a low-pass filter 310. For example, it is an image in which a low-pass filter 310 composed of a resistor 311 and a capacitor 312 and having a cutoff frequency of about 1 kHz is formed. Note that since the DC component is not transmitted from the signal detection unit 110 to the effect generation unit 210, a high-pass filter 320 (for example, composed of a capacitor 321) is also included. However, since it is desirable to have a characteristic that can transmit even at a frequency lower than the lowest frequency in the audible range, it is considered that there is little need to be conscious of the characteristics of the high-pass filter 320. Further, FIG. 6 only shows an image, and the configurations of the low-pass filter 310 and the high-pass filter 320 do not necessarily have to be limited to the configurations shown in FIG. 6.

[0017] According to the analog effect for electronic musical instruments of the present invention, the magnetic material 300 is used. Since it is difficult to specify the characteristics of the magnetic material 300, even if the parameters of the electronic circuit part are known, the tone color cannot be reproduced. In order to reproduce the same tone color in a imitation, trial and error of the parameters (resistance value, capacitance, etc.) of the components of the electronic circuit are required. Therefore, it is difficult to create a imitation.

Description of Reference Numerals

[0018] 10 Effect 11 Input terminal 12 Output terminal 100 First circuit 110 Signal detection unit 120 Amplification unit 130 Magnetic field generation unit 200 Second circuit 210 Effect generation unit 220 Amplification unit 230 Magnetic field input unit 300 Magnetic material 310 Low-pass filter 320 High-pass filter 400 Acoustic signal processing unit 500 Synthesis unit 600 DC power supply

Claims

1. A first circuit that detects a signal determining the degree of an effect and outputs a magnetic field signal as an output signal, A second circuit that uses the magnetic field signal as an input signal and outputs a signal that gives an effect, A magnetic body that couples the output of the first circuit and the input of the second circuit, An analog effect for electronic musical instruments comprising the above.

2. The analog effect for electronic musical instruments according to Claim 1, wherein the part of the second circuit that detects the input signal of the magnetic field is an electric wire having a resistance value between it and ground. An analog effect for electronic musical instruments characterized by the above.

3. The analog effect for electronic musical instruments according to Claim 1 or 2, wherein the magnetic body is a plate-shaped magnetic body disposed on the inner surface side of the housing of the analog effect for electronic musical instruments. An analog effect for electronic musical instruments characterized by the above.

4. The analog effect for electronic musical instruments according to Claim 1 or 2, wherein the signal detected by the first circuit is an acoustic signal that gives an effect. An analog effect for electronic musical instruments characterized by the above.

5. The analog effect for electronic musical instruments according to Claim 1 or 2, wherein the signal detected by the first circuit is the current supplied by the DC power supply of the analog effect for electronic musical instruments. An analog effect for electronic musical instruments characterized by the above.

6. The analog effect for electronic musical instruments according to Claim 1 or 2, wherein the signal detected by the first circuit is a signal input from the outside. An analog effect for electronic musical instruments characterized by the above.

7. The analog effect for electronic musical instruments according to Claim 1 or 2, wherein the first circuit outputs a magnetic field generated by a coil as an output signal. An analog effect for electronic musical instruments characterized by the above.

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