KR100644021B1 - Percussion instrument using touch switch - Google Patents

Abstract

In an electronic drum player, tapping a conductive pad with a conductive drumstick causes an electric signal to flow between the drum drum and the pad. The microcontroller of the main body of the electronic drum playing apparatus detects the electric signal, finds out which pad touches the drumstick, and generates a drum sound of the tone assigned to the pad through the sound generator. The drumstick may further include a vibration sensor, in which case the microcontroller interprets the signal from the vibration sensor to find out the impact strength information of the drumstick hitting the pad and adjusts the volume to generate the sound of the tone assigned to the pad. Generate through wealth. The pad information hit by the drumstick and the intensity information hit by the drumstick may be transmitted to an external device or a PC through the communication unit, and if the communication unit is included, the sound generator may be omitted.

Electronic drum, percussion, conductive pad, conductive drumstick, acceleration sensor, vibration sensor, piezoelectric sensor, electronic musical instrument, conductive pad, conductive drumstick, touch switch, electronic piano, electronic xylophone

Description

Drum instrument by touch switch {Percussion instrument using touch switch}

1 is an external configuration diagram of the present invention.

Fig. 2 is a circuit diagram of Example 1-1.

Fig. 3 is a circuit diagram of Example 1-2.

Figure 4 is a circuit diagram of Example 2-1

Fig. 5 is a circuit diagram of Example 2-2.

6 is a circuit diagram of Example 3-1.

Fig. 7 is a circuit diagram of Example 3-2.

8 is a timing diagram of an electrical signal output to an output port of a microcontroller equipped with eight conductive pads.

9 is a flow chart of a method for detecting a pad hit by using the output signal of FIG.

10 is a vibration sensor consisting of a cylinder and a spring

11 is a vibration sensor composed of a shaft and a spring

12 is a configuration diagram of an embodiment in which the number of pads is increased by using an encoder.

Fig. 13 is a configuration diagram of an embodiment in which the number of pads is increased by using a decoder.

<Description of the code for the main part of the figure>

M: main body P: pad

T: drum holder H: conductive terminal

SD: Sound generator CM: Communication unit

MI: Microcontroller PD: Conductive Pad

LS: Left drumstick RS: Right drumstick

F, S: Conductive spring terminal SP1, SP2: Conductive spring CY: Conductive cylinder FI: Spring fixed end MO: Free end of spring AX: Conductive shaft

t1: time when drumstick starts to contact pad t2: time when drumstick falls from pad

tf: time when voltage rise of terminal F in Figs.

ts: time when voltage rise of terminal S in Figs.

En: Encoder De: Decoder

The present invention relates to an electronic drum player, which uses a switching action between a conductive pad given an electric signal and a drumstick attached to an electrode to find a pad tapped with a drumstick, and a drumstick as a signal of a vibration sensor attached to the drumstick. This is a device for playing drums by detecting the strength of the pads.

Conventional drum player is to generate a sound by tapping the drum pad with a piezoelectric sensor, acceleration sensor or vibration sensor. Such a conventional drum player has a limitation in reducing the cost of manufacturing the pad because it must be attached to each pad, and the pad can not be folded or rolled up like storage. In addition, pads that have already been made cannot be modified or reconfigured by the user. However, using the technique of the present invention, the pad may be formed by coating a conductive material on a rollable or foldable film as well as a pad reconstruction by a daily necessity such as an electrically thin metal plate or a metal bowl, so that the user may modify the pad. The mold production cost of the conventional pad portion can be reduced. Therefore, it is inexpensive and easy to carry, install and store, so you can play drums anytime and anywhere.

The present invention overcomes the limitations of the conventional drum player as described above, and can freely configure the pads directly into an object such as a metal bowl used by the user, or fold or roll like a roll, away from a predetermined pad shape. An object of the present invention is to provide a drum player capable of constructing a pad with a conductive coating material on a vinyl film. In addition, when the performance signal of the drum player is transmitted to a game program or Internet communication program running on a PC, the input drum pad information and impact strength of the drum drum can be used as an input signal of the game, or the performance signal can be transmitted to a remote place over the Internet in real time. have.

The drum player of the present invention is composed of a main body portion M, a conductive pad portion P, and a drum holder portion T as shown in FIG. The main body includes at least one of a sound generator and a communication unit. The sound generator generates drum sounds on the same principle as the apparatus used to generate sound on a digital piano. The communication unit transmits a signal to an external device such as a usb interface. In Fig. 1, a plurality of conductive pads PD (attached as shown in Fig. 1) attached to the main body are played by tapping with drum drum T. The conductive pad is configured by using an electrically conductive metal plate or a conductive rubber pad or a stainless steel bowl. The head portion of the drumstick shown in FIG. 1 is provided with a conductive terminal H for transmitting an electric signal applied to the pad to the microcontroller MI of the body portion M. The electric signal applied to the pad PD through the terminal H attached to the head of the drum is transferred to the microcontroller MI at the moment when the drum is contacted, and it is to find out which pad is hit by the drum. . Hereinafter, the operation method will be described in detail. Embodiments of the drum player according to the present invention are classified as follows.

Embodiments of the drum playing apparatus according to the present invention may be classified into embodiments flowing from the pad PD to the drumstick H as opposed to embodiments flowing from the electric drum drum H to the pad PD.

An embodiment of the drum player according to the present invention may be classified into an embodiment which does not distinguish whether the drum drum beats are the left drum LS or the right drum.

Embodiments of the drum player according to the present invention may be classified into an embodiment of detecting the strength of hitting the pad with a drumstick and an embodiment of not sensing.

In addition, when sensing the strength of tapping the pad with the drumstick can be classified into an embodiment using two springs and one application in one drumstick. In addition, the present invention may be classified into an embodiment configured without increasing the number of pads and an embodiment in which the number of pads is increased by adding an encoder or decoder circuit. This is summarized as follows.

 Detection direction of electric signal Drumstick-> Pad Pad-> Drumstick Detect only hit pads Example 1-1 Claim 2 FIG. 2 Example 1-2 Claim 3 FIG. 3 Tap pad and drumstick type (left right drumstick) detection Example 2-1 Claim 4 FIG. 4 Example 2-2 Claim 5 FIG. 5 Detecting tapping pad and drumstick type and tapping strength of drumstick Example 3-1 Claim 6 FIG. 6 Example 3-2 Claim 6 Fig. 7 Detect tapping strength of drumstick with one spring Example 4 Claim 9 Increased pad count Example 5-1 Claim 10 Fig. 12 Example 5-2 Claim 11 Fig. 13

Example 1-1

In this embodiment, as shown in Fig. 2, an electrical signal (0 volt voltage signal) flows from the drum holder H to the pad PD, and the microcontroller MI detects the signal through the input port. Explain how to find out. Here, the electrical signal flows from the drum to the pad, which means that the zero-volt voltage signal from the drum is passed through the pad to the input port of the microcontroller. In the following description, the input port of the microcontroller is indicated by the arrow pointing to the microcontroller MI in FIGS. 2 to 13 and the output port is indicated by the arrow from the microcontroller MI. In FIG. 2, the microcontroller is constantly checking eight input ports. A conductive pad (PD) is attached to the input port of the microcontroller by a wire. The conductive pads are supplied with a power supply voltage Vcc via a pull up resistor. When you tap these pads with a grounded drumstick, the voltage of the conductive pads that you tap at that moment will change from Vcc to 0 volts, and the change will be detected by the microcontroller by reading the voltage at the input port and the drum sound of the tone assigned to that pad will sound. The pad number generated by the generation unit SD or knocked to the external device through the communication unit CM is output. The communication unit CM may be a USB interface, and the external device may be a PC, a PDA, a smartphone, or an MP3 player. A program or device driver running on an external device, such as a PC, can receive the pad number to generate sound on the sound card or use it as an input signal for a game.

Example 1-2

In the present embodiment, the case where the flow of the electric signal is reversed in the above embodiment 1-1 will be described. As shown in FIG. 3, the eight conductive pads PD are connected to the output ports of the microcontroller MI, respectively. Each conductive pad is grounded through a pull down resistor. The conductive terminal H at the end of the drum is connected to the input port of the microcontroller MI in a grounded state. The microcontroller rotates eight output ports as shown in the timing diagram shown in FIG. In fact, it is possible to have a value of 3 volts and so on. In this way, the signal voltage is output to each port while the input port is inspected in parallel. This will be described in detail as follows.

(1) Initialize output port number i to output 5 volts to 0.

(2) Output 5 volts to the i'th output port and 0 volts to the remaining output ports.

(3) Check the voltage at the input port (read the input port value).

(4) If a change in voltage is detected at the input port, it means that the i-th pad is tapped with a drumstick at that moment, generating a drum sound of the i-th tone through the sound generator or transmitting the number i to the external device through the communication unit. .

(5) Increase i by 1.

(6) If i is 8, initialize i to 0.

Repeat the above process from (7) (2).

The operation of the above (1) to (7) is shown in a flowchart as shown in FIG.

Example 2-1

In the present embodiment shown in Fig. 4, a method of detecting a tapping drum in addition to the padding pad detected in Example 1-1 (that is, a method of detecting whether the tapping drum is a right drum or a left drum) is described. The detection method of the drumstick is alternately connected to the left (LS) and the right (RS) drumsticks to different output ports of the microcontroller (MI), and outputs 0 volts to only one drumstick of the two drumsticks at a moment. The eight input ports are tested with five volts output. This will be described in detail as follows. In the following description, the left and right drumsticks are assigned a drumstick number of 0 and 1, respectively.

(1) Output 0 volts to the left drum (LS) and 5 volts to the right drum (RS).

(2) Examine the eight input ports.

(3) If voltage drop is detected from 5 volts to 5 volts at the i-th input port of the input port, it means that the i-th tone is generated by tapping the i-th pad (PD) with the left drum (LS). Send i and knocked drumstick number (left drumstick number = 0) to external device.

(4) Output 0 volts to the right drum and 5 volts to the left drum.

(5) Examine the eight input ports.

(6) If a voltage drop is detected from 5 volts to 0 volts at the i th input port, it means that the i th pad is hit with the right drumstick. (Right drum stick number = 1) is sent to the external device.

(7) Repeat the above operation sequence from (1).

Example 2-2

In this embodiment shown in Fig. 5, a method of detecting a tapping drum in addition to the padding pad detected in Example 1-2 will be described (that is, a method for detecting whether the tapping drum is a right drum or a left drum). The detection method of the drumstick is to check the values of the two input ports by connecting the grounded left (LS) right (RS) drum drum to the different input ports of the microcontroller (MI) through a pull-down resistor. The drumstick tapped on the side of the two input ports where the voltage rise is detected. That is, the operation method except the two input ports to be examined is the same as in Example 1-2.

Example 3-1

In the present embodiment shown in Fig. 6, an apparatus in which the function of detecting the intensity (hit strength) of hitting the pad with a drumstick is also described in the apparatus of Example 2-1. The detected tap strength is used to adjust the volume (volume) of the sound to be generated. In other words, the harder you tap, the louder the sound. For the present embodiment, a volume control unit for causing the sound generating unit to change the volume according to the striking intensity is included in the main body. In most cases, you will adjust the volume significantly in proportion to the blow intensity.

One way to detect the strength of a key press on a conventional digital piano or master keyboard is to attach two switches to a single key, which is on when the key starts to be pressed, and on when the key is pressed deep. The time difference is measured, and the shorter the time difference is, the harder the key is judged. As the intensity of the key pressed in this way increases, the sound is generated at a high volume.

Similarly, in this embodiment, as shown in FIGS. 10 and 11, two pads of conductive springs SP1 and SP2 having different diameters are attached to the drum blade T, and the pad PD is knocked on the drum blade T. When the spring is bent to contact the conductive cylinder CY or the shaft AX, the switch is turned on, and the microcontroller MI detects the moment of the change of the state, and calculates the strength of tapping the pad with the drumstick.

The operating principle of the spring switch of Figure 10 is as follows. In the conductive cylinder CY connected to the voltage Vcc, two springs SP1 and SP2 having different diameters are disposed on the conductive cylinder CY axis. The cylinder is fixed to the drum (T). The outer part of the cylinder (FI) of the two springs is fixed to the drum holder and the part (MO) inside the cylinder is free to move. Both springs (SP1, SP2) are grounded through pull-down resistors. When the pad is hit by a drum with a spring and a cylinder attached to the spring, a large spring SP2 first contacts the cylinder CY, and the voltage of the terminal F rises from 0 volts to Vcc volts. After a while, the spring SP1 having a small diameter contacts the cylinder CY so that the voltage of the terminal S increases from 0 volts to Vcc. If the terminals F and S are connected to the two input ports of the microcontroller (MI) respectively and the ports are inspected, the two springs can be detected when they are in contact with the cylinder, and the time difference is measured. I can figure it out. That is, the shorter the time it took for the voltage to rise from zero volts to Vcc at F and then at V to zero Vcc at S, the more strongly the pads hit the drum. These terminals F and S are installed in each of the left and right drums LS and RS as shown in FIG. 6 and connected to four input ports of the microcontroller, respectively, to detect the tapping strength of the left and right drums. Functions other than the function of detecting the knock strength of the drumstick by the F and S terminals are the same as in Example 2-1.

The spring switch shown in FIG. 11 also performs the same function as the spring switch of FIG. The difference is that the conductive shaft AX is used instead of the conductive cylinder CY shown in FIG. That is, two springs SP1 and SP2 having different diameters are disposed on the conductive shaft AX. The axis AX is fixed to the drum holder T. One end FI of the two springs is fixed to the drum holder T, respectively, and the other end MO is free to move. When the pad is hit by a drum with a spring and a shaft attached thereto, the spring SP1 having a small diameter contacts the shaft AX first, and the voltage of the terminal F shown in FIG. 11 rises from 0 volts to Vcc. After some time, the spring SP2 having a large diameter is bent to contact the shaft AX to increase the voltage of the terminal S from 0 volt to Vcc. When the F and S terminals are connected to the input port of the microcontroller to detect the moment of voltage increase, the strength of the pad hitting the pad can be determined. The tapping intensity of the drum found as described above is used to adjust the volume of the sound generated through the sound generator or transmitted to an external device.

Example 3-2

This embodiment shown in Fig. 7 describes an apparatus in which the function of detecting the intensity of tapping the pad with a drumstick is also added to the apparatus of Example 2-2. The method of detecting the intensity of hitting the pad with a drumstick is the same as that of Example 3-1. That is, the spring switch device may be added to the device of Example 2-2 as described in Example 3-1.

Example 4

In Example 3-1 and Example 3-2, two springs are attached to one drumstick to configure the drumstick to measure the strength of tapping the pad PD. However, one spring may be omitted to simplify the configuration. That is, when the pad is knocked with a drumstick omitting one of the two springs SP1 or SP2 of the embodiment 3-1 and the embodiment 3-2, the microcontroller senses the moment when the pad is hit. After a while, the microcontroller detects that the spring bends and contacts the cylinder (CY) or shaft (AX) of the drum. The microcontroller can detect the strength with which the drumstick hits the pad by measuring the time difference between the moment when the drumstick contacts the pad and the spring contacts the cylinder (CY) or axis (AX) of the drumstick.

Example 5-1

In the above embodiment, the case where eight pads are configured has been described as an example, but it is also possible to increase the number of pads to eight or more as shown in FIG. That is, Example 1-1. 2-1. In the case of 3-1, to increase the number of pads, an encoder may be added to the circuit of each embodiment as follows. In other words, if a pad with a pull-up resistor is attached to the input port of the encoder and the input port of the microcontroller is connected to the output terminal of the encoder, the pad of the microcontroller is 8 while the number of the input port of the microcontroller is kept to 8, You can increase it to 255. Here, the encoder refers to a combination circuit that outputs a binary value corresponding to the number of input terminals that are 0 volts when only one terminal of the input terminals is 0 volt and all other input ports are Vcc. Such an encoder chip is 74HC148. The microcontroller can examine the input port to determine the pad number that corresponds to the binary value entered when the input value is changed.

Example 5-2

Similarly, if the input ports of the decoder are connected to the output ports of the microcontrollers of Examples 1-2, 2-2, and 3-2, and the pad connected to the pull-down resistor is connected to the output terminal of the decoder, the output of the microcontroller is shown in FIG. You can increase the number of pads without increasing the number of ports. Here, the decoder is a combination circuit that outputs Vcc only to the output terminal of the number corresponding to the binary signal given to the input terminal and outputs 0 volts to the remaining output ports. An example of such a decoder chip is 74 HC42.

In this way, the number of pads can be increased by adding an encoder or decoder circuit so that eight pads can be made into a drum shape, and the other pads can be made into a keyboard form of a piano. At this time, it is preferable to generate a piano sound by tapping the pad of the piano keyboard form drum drum, and to generate a drum sound by tapping the pad pad of the drum type.

In all the above embodiments, the configuration in which 0 volts and Vcc are interchanged and pull-up resistors are changed to pull-down resistors operates on the same principle, and thus all detailed descriptions are omitted.

Other applications

The main body may include a communication unit (for example, a serial port interface, a USB port interface, or a MIDI port interface) with an external device or a PC, to externally transmit the detected impact strength of the drumstick and the impacted pad area. In this case, the transmission signal may be a MIDI format, which is a standard format of signals between electronic musical instruments, or may be a dedicated format of the present invention. In this case, the external device may generate an instrument sound as a received signal or use it as an input signal for a game. In the case where the external device is a PC, the sound generated by the main unit may be omitted in this case since the program executed in the PC interprets the signal of the device according to the present invention to generate a sound to the sound card of the PC.

The embodiments described above are only specific implementations of the technical idea in the present invention, and thus should not be construed as being limited to these embodiments in determining the technical scope of the present invention. The technical scope of the present invention will be reasonably determined by the method of interpretation of the claims.

According to the drum playing apparatus according to the touch switch according to the present invention, the pad is formed by coating a pad with a conductive rubber on a thin film without a lot of heavy and heavy drum drum pads required for the conventional drum playing apparatus, and tapping the drum with drumsticks. Since it can be played, it is easy to carry, install and store, so anyone can play drums anytime and anywhere. In addition, unlike the conventional pad having a complex internal structure attached to the vibration sensor, the pad portion for implementing the drum player of the present invention can be freely reconfigured by the user to everyday products such as conductive bowls without the need for mold production Can be dramatically lowered. When using a stainless steel metal bowl as a pad, the sound of various tones (animal sounds other than drum sounds, piano sounds, etc.) can be generated by tapping the bowl, thus providing a novelty and surprise to the user, which makes the drum playing apparatus according to the present invention more suitable. It can be immersive.

Claims (11)

In the electronic drum player, A pad unit including a plurality of conductive pads arranged at a distance so as not to contact each other, One or more drumsticks having a conductive terminal attached to one end and hitting the pad of the pad unit, wherein the conductive terminal contacts the conductive pad. Detects the contact between the pad of the pad portion and the conductive terminal of the drum body to recognize the pad knocked with drum pad and to generate the drum sound of the tone assigned to the pad, or to transmit information about the pad to the external device. A main body including a microcontroller, and a main body including a sound generator for generating a corresponding sound assigned to each pad or a communication unit for transmitting information about a pad recognized by the microcontroller to an external device. Drum playing equipment. The method of claim 1, The conductive terminal of the drum body is grounded Each conductive pad of the pad portion is configured to be connected to different input ports of the microcontroller of the main body portion in a state where a power supply voltage is applied through a pull-up resistor, respectively. When the drumstick is in contact with the pad, the voltage of the conductive pad is reduced to 0 volts by the ground voltage of the terminal of the drum, so the microcontroller senses which pad the drum is tapped by sensing the conductive pad on which the voltage drop has occurred. Drum playing device by touch switch. The method of claim 1, It is connected to one input port of the microcontroller of the main body part while the conductive terminal of the drum body part is grounded. Each conductive pad of the pad part is configured to be connected to different output ports of the microcontroller in a grounded state through a pull-down resistor, respectively.  The microcontroller of the main body outputs 5 volts to only one output port at a moment for each output port and 0 volts to the remaining output ports, and checks the input port in parallel to increase the voltage of the input port. A drum playing apparatus according to a touch switch, characterized by recognizing a moment and detecting a pad corresponding to an output port outputting 5 volts. The method of claim 1, The conductive terminals of each drum housing are connected to different output ports of the microcontroller of the main body. Each conductive pad of the pad part is connected to different input ports of the microcontroller while the power voltage is applied through the pull-up resistor. The microcontroller of the main unit outputs 0 volts to only one output port at a time and outputs 5 volts to the remaining output ports in sequence with respect to the output port. And a pad corresponding to an input port in which the voltage drop has occurred, by detecting that the voltage falls to 0 volts from the power supply voltage. The method of claim 1, The conductive terminals of each drum housing are connected to different input ports of the microcontroller of the main body while being grounded through pull-down resistors. Each conductive pad of the pad part is connected to the output port of the microcontroller while being grounded through a pull-down resistor. The microcontroller of the main body outputs 5 volts to only one output port at a time and outputs 0 volts to the other output ports at the same time for each of the output ports in parallel. The drum playing apparatus according to the touch switch characterized in that the sensing the output port that outputs 5 volts at the moment of rising to recognize the corresponding pad. The method according to claim 4 or 5, The drum chaebu comprises a vibration sensor that can detect the vibration of the drum chae The microcontroller of the main body interprets the signal from the vibration sensor to detect the hitting strength of the pad with a drumstick, and transmits the value to an external device or adjusts the volume of the drum sound to be generated by the sound generator according to the hitting strength. Drum playing apparatus by a touch switch, characterized in that it comprises a volume control unit. The vibration sensor of claim 6, It consists of a conductive cylinder attached to the inside of the drum and two conductive coil springs of different diameters installed at a distance so as not to contact each other on the same axis inside the conductive cylinder, The outside of the cylinder of the spring is fixed to the drum and the inside of the cylinder is free to move, the conductive cylinder is applied a constant power supply voltage, each spring is connected to each other of the microcontroller of the body part in the ground state through the pull-down resistor Connected to another input port The microcontroller of the main body is a drum by a touch switch, which detects the impact strength of the drum body by measuring the time difference in which the voltage of the input port connected with the spring rises at the moment when the drum body strikes the pad and each spring contacts the cylinder. Playing equipment. The vibration sensor of claim 6, It consists of a conductive shaft attached to the inside of the drum and two conductive coil springs of different diameters are installed at a distance so as not to contact each other on the same shaft inside the conductive shaft, One end of the spring is fixed to the drum and the other end is free to move. The conductive shaft is supplied with a constant power supply voltage, and each spring is grounded through a pull-down resistor. Connected to, The microcontroller of the main body part is a drum playing device with a touch switch, which detects the striking force of the drum blade portion by the time difference when the drum pole strikes the pad and each spring contacts the conductive shaft and the voltage of the input port connected to the spring increases. . The vibration sensor of claim 6, It consists of a conductive shaft attached to the inside of the drum and one conductive spring which is installed at a distance so as not to contact the conductive shaft when no external force is applied, One end of the spring is fixed to the drum holder so that when the external force is applied, the other end of the spring is freely moved to contact the conductive shaft, and a constant power supply voltage is applied to the conductive shaft, and the spring is grounded through the pull-down resistor. Connected to the controller's input port The microcontroller of the main body is a drum-playing device with a touch switch, characterized in that it detects the impact strength of the drum body portion by measuring the time difference between the moment the drum body hits the pad and the moment the spring contacts the conductive shaft. The method according to claim 2 or 4, wherein the main body unit has a binary value corresponding to an input terminal in which 0 volts is input when an electrical signal given to a plurality of input terminals is 0 volts of only one input terminal and the other input terminal is a power voltage. Including an encoder circuit that outputs an electrical signal, one pad is connected to each of the plurality of input terminals of the encoder, and the input port of the microcontroller is connected to each of the plurality of output terminals of the encoder, and the microcontroller taps from the input binary value. Drum-playing apparatus by touch switch characterized by finding out the pad. The plurality of outputs of the decoder of claim 3 or 5, wherein the main body includes a decoder circuit that outputs a power supply voltage only to an output terminal corresponding to a binary value input to a plurality of input terminals and outputs 0 volts to the remaining output terminals. One pad is connected to each terminal, and the output port of the microcontroller is connected to each of the multiple input terminals of the decoder, and the microcontroller infinitely repeats the output from 0 to the maximum value by sequentially increasing the electrical signal of the binary value. At the same time, the drum playing device by the touch switch, characterized in that the input port of the microcontroller is checked to find out the pad that was hit.

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