KR20010110616A - Structures, Musical Instruments, and Filters Using String Tension Changes - Google Patents

Abstract

The present invention relates to an instrument using a string tension change, and more particularly, to an instrument that generates a change in the pitch of sound generated in a string as the string tension is changed. Unlike conventional string instruments, in which the string length and tension are fixed, the string height is changed by changing the tension of the string using electric or magnetic force.

Structures that actively change the tension of the strings can be used as acoustic filters, electrical signal filters, and filters using DNA strings.

Description

Structures, Musical Instruments and Filters Using String Tension Changes {.}

The present invention relates to an instrument using a change in tension of a string, and more particularly, to an instrument that generates a change in pitch of sound generated in a string as the tension of a string is changed. Unlike conventional string instruments, in which the string length and tension are fixed, the string height is changed by changing the tension of the string using electric or magnetic force.

Still another object of the present invention is to implement a structure and a filter that obtains a signal of a specific frequency by passing a string after changing an external signal into a mechanical signal using the above tension change. In this case, the filter can be used for various purposes depending on the height of the frequency.

The origin of musical instruments began through the acts of tapping and rubbing various objects around them. As human civilization developed, various instruments now exist. Many instruments, especially pianos, violins, and guitars, use strings to give us the sound we want.

1 is a conceptual diagram of an existing musical instrument simply drawn to explain the principle of a musical instrument having a string, such as a conventional piano, violin, guitar.

The existing musical instrument 100 has a configuration in which one or more strings 103 are installed between the supports after setting up a plurality of supports 102 on the substrate 101. Negative pitching uses a manual tensioning device, not shown. In the case of guitar, a tension adjusting device using a worm gear is used. In the case of the piano, the string 103, which maintains this specific value of tension, is knocked using a small hammer 104. This results in a sound with a specially determined pitch in the strings. 2-1 and 2-2 are used to explain that the string only outputs a specific frequency.

2-1 shows a simpler view of FIG. 1, with the current 203 connected between the support ends 201 and 202. FIG. The tension of the string 203 generates a tension of 205 to the string 203 by a manual tension control device (not shown). 204 shows the movement of the string when hammering the string 203. In this form, the string moves with a certain frequency and has ambient air, and the movement of this air is propagated as a wave. By coming into the ear of people, people hear sounds with a certain pitch.

Figure 2-2 shows the blurring of the force (or energy) to explain how the hammer's force is heard as a sound with a certain pitch when the string is hit with the hammer.

The hammering of the string 203 above imparts an impulse to the string, see the related frequency theory (eg, M. Schwartz, "Information Transmission, Modulation and Noise," McGraw-Hill, 3rd Ed, 1980). It can be seen as an excitation force having a broad excitation frequency in the frequency domain. In other words, it can be seen as White Noise 211, which is a combination of forces with various frequencies. The white noise is input to the string 203 having a specific resonance frequency, and the string 203 vibrates with only a specific resonance frequency, thereby acting as an acoustic band pass filter 213. That is, the white noise 211 given from the hammer passes through a band pass filter 213 called a string and vibrates at a specific frequency having a single pitch, thereby vibrating air at a specific frequency to generate a specific sound 204. The sound of the string is changed depending on the length of the string and the tension of the string, if the length is given by using a manual tension control device 212 to adjust the fine difference of the sound (Tuning). In addition, there are many cases where a cavity called a ring is placed near the string so that the sound may be louder due to resonance.

Resonance frequency of the string 203 is referred to as acoustics (e.g., LE Kinsler, et al., "Fundamentals of Acoustics," John Wiley & Sons, Inc. 3rd Ed., 1982). When both ends of a very large string are supported and the tension T is applied to the string, the first resonant frequency f of the string is expressed as follows.

Where L, T and p represent the length of the string, the tension applied to the string, and the mass of the string length. The above equation shows that the sound produced by the string is proportional to the square root of tension and inversely proportional to the length. Overall, the tighter the strings and the shorter the strings, the higher the sound.

Existing instruments with strings operated by this principle require multiple strings by giving a fixed note. For example, in the case of a piano, a string corresponding to the number of keys of the piano is required as there is a string having a specific length corresponding to the diagram, and a string corresponding to the string. The strings shall be equipped with a manual device for each string to adjust the tension of each string in order to produce the correct sound. For this reason, pianos are expensive products, and even after one purchase, they should be tuned periodically by a specialist to produce a specific note.

The present invention is to eliminate the above-mentioned inconveniences and problems, it is an object of the present invention to freely change the pitch of the sound generated in the string by actively changing the tension of the string. Therefore, a few strings can be used to produce a variety of notes, and can be easily applied to digital performances using a computer.

Still another object of the present invention is to implement a structure and a filter which obtains only a signal of a specific frequency by passing a string after changing an external signal into a mechanical signal using the above tension change. In this case, the filter can be used for various purposes depending on the height of the frequency.

1 is a conceptual diagram of an existing musical instrument

Acoustic Principle of Existing Instruments

3 is a principle of the pitch control instrument according to the present invention

4-1 and 4-2 illustrate embodiments of the tension adjusting device for the negative pitch adjusting instrument according to the present invention.

5 is an embodiment of another tension adjusting device of the musical instrument according to the present invention

6 is an embodiment of a musical instrument according to the present invention

7 is a perspective view of one embodiment of a musical instrument according to the present invention

8 is another embodiment of a musical instrument according to the present invention

In order to achieve the above object, the following invention is constructed.

A substrate;

At least one support protruding from the substrate;

At least one string having one side connected to one of the supports;

Another side of the string is capable of actively adjusting the tension of the string in accordance with an external signal, the tension adjustment window is supported on the support;

And a resonant frequency of the string can be arbitrarily changed by adjusting the tension of the string with the tension adjusting device.

In addition to the configuration of the instrument, further implementation alone or in parallel with ekdmadfm may yield more desirable results.

-The instrument, characterized in that the tension adjusting device to adjust the tension of the string using a magnetic force.

-An instrument comprising a magnetic force tension adjusting device consisting of an iron core and a solenoid coil.

-An instrument characterized in that the tension adjusting device using a magnetic force uses a motor.

The tension adjusting device adjusts the tension of the string using an electric force.

-An instrument which is characterized by generating an electric force by applying a voltage to the plate facing the tension adjusting device using the electric force.

-An instrument in which a tension adjusting device using electric force has a structure in which one electrode is sandwiched between the other electrode;

-Suspending a mass on a portion of the string to change the vibration characteristics of the string.

-A part of the string that does not vibrate in the vibrating direction of the string, wherein the tension generated by the tension adjusting device has a guide means to be transmitted to the string as it is.

An instrument having excitation means for exerting a force on said string.

-An instrument characterized in that the signal generated by the excitation means is white noise having various frequency components.

An instrument further comprising sensing means for sensing the movement or the sound of said string.

-An instrument characterized in that the string tremble at a specific frequency by feeding back the signal detected by the sensing means to the tension adjusting device.

The tension adjusting structure for adjusting the resonant frequency of the preferred string has the following configuration.

A substrate;

At least one support protruding from the substrate;

At least one string having one side connected to one of the supports;

Another side of the string can be actively adjusted the tension of the string according to the external signal, the tension adjustment window that is supported by the support;

Guide means for allowing a portion of the string to move in the direction of tension, but not in the direction of vibration of the string in a direction perpendicular to the string; Structure characterized in that configured to have.

In addition to the above structures, the following, alone or in combination, may yield more desirable results.

-Structure characterized in that the tension adjusting device to adjust the tension of the string using a magnetic force.

-Structure characterized in that the tension adjusting device using a magnetic force consists of an iron core and a solenoid coil.

-Structure characterized in that the tension adjusting device using a magnetic force uses a motor.

The tension adjusting device adjusts the tension of the string using an electric force.

-A structure, characterized in that to generate an electric force by applying a voltage to the plate facing the tension adjusting device using the electric force.

-An instrument in which a tension adjusting device using electric force has a structure in which one electrode is sandwiched between the other electrode;

The tension adjusting device uses a lever.

The tension adjusting device combines a plurality of gears to increase the force.

-Suspending at least one mass on a portion of the string to change the vibration characteristics of the string.

An instrument having an excitation means for exerting a force on the string or mass in accordance with an external signal.

The signal generated by the excitation means is white noise having various frequency components.

Structure further characterized in that it further comprises a sensing means for detecting the movement or the sound of the string.

-A structure characterized in that the string tremble at a specific frequency by feeding back the signal detected by the sensing means to the tension adjusting device.

The configuration of the preferred filter is as follows.

A substrate;

At least one support protruding from the substrate;

At least one string having one side connected to one of the supports;

Another side of the string is a tension adjustment device that can actively adjust the tension of the string in accordance with the signal, the support portion;

Guide means for allowing a portion of the string to move in the tensioned direction but not in the direction of vibration of the string in a direction perpendicular to the string;

Improving the resonant frequency characteristics of the strings and attaching one or more masses to a portion of the strings;

An excitation means for applying a force to the string and the mass as an external signal is input;

And a sensing means for sensing the movement of the strings so as to pass only a signal having a specific bandwidth among external electrical signals.

In addition to the above filters, the following may be further performed alone or in combination to obtain more desirable results.

-The filter, characterized in that the external signal before filtering is an acoustic signal (Acoustic Signal).

A filter, wherein the signal before filtering is an electrical signal.

Another preferred filter configuration is as follows.

A substrate;

At least one support protruding from the substrate;

At least one string having one side connected to one of the supports;

Another side of the string may be actively adjusting the tension of the string according to the signal, the tension adjustment window which is supported by the support;

An excitation means for applying a force to the string and the mass as an external signal is input;

And a sensing means for sensing the movement of the strings so as to pass only a signal having a specific bandwidth among external electrical signals.

In addition to the above filters, the following may be further performed alone or in combination to obtain more desirable results.

Filter characterized in that the string consists of chains of DNA.

A filter, characterized in that the string consists of a chain of organic matter.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 3 shows the configuration of the musical instrument capable of adjusting the pitch according to the present invention, one side of the string 302 is connected to the support end 301 on the left side and the other side of the string is connected to the tension adjusting device 303, the adjusting device 303 is connected to another support end 307, the tension adjustment window 304 has a configuration connected to the tension control device 304.

Referring to the principle of operation according to the configuration, when the tension applied to the string 302 by using the tension adjusting device 303 in conjunction with the tension control device 304 while vibrating the string with an excitation means 305, such as a hammer, corresponds to the tension Sound will be generated. For example, if a piano having such a configuration is made, when a person presses a tile and a sequential person, an appropriate tension corresponding to degrees is applied to the string 302 by the tension adjusting device 303, and then the tension corresponding to the next level. It will change to and hit the string with the hammer 305 can get the sound corresponding to the tile.

The cross section of the string 302 may be circular, square or any cross section, and the excitation means 305 may be any means capable of applying vibration to the string 302. That is, the hammer 305 as shown in FIG. 3 may be used, the string may be vibrated using a bow (not shown), such as a violin, or the string may be vibrated by a human hand like a guitar. This description refers to the method used in the existing musical instruments, but the present invention described in FIG. That is, the string may be excited by a magnetic force such as an electromagnet or a permanent magnet, or the string may be excited by an electric force by applying a negative voltage to the string. That is, it can be seen that any excitation means can be used.

In order to adjust the sound generated by the string 302, the tension adjusting device 303 is adjusted in connection with the tension control device 304, it is possible to generate a sound by setting a value corresponding to the sound to be generated in advance. In this case, it is Open Loop Control. It is advantageous to use Close Loop Control to actively control more accurate sounds. In order to do this, it is advantageous to additionally install a sensor (not shown) that detects sound or string movement. The sensor may be to detect sound waves transmitted from the air, and any one may be used as long as it detects movement of the string vibration. For example, to catch sound waves in the air, a microphone is placed in the vicinity of the string, and the minute movement of air generated by the string, that is, a sound signal is converted into an electrical signal and fed back to the tension controller 304. By controlling the tension adjusting device 303, accurate sound can be produced. As a method of directly sensing the movement of the string, a strain gage sensor that can determine the vibration state of the string by attaching a strain gage to the surface of the string to determine the extension and contraction of the string surface according to the movement of the string; The gap sensor is installed close to the string 302 to find out the distance between the string and the gap sensor and the vibration state of the string can be determined. Laser Doppler Velocimeter, which calculates the speed of a specific position, magnetic sensor (including electromagnet) located near the string, and magnetic sensor to grasp the movement of the string by current induced from coil of electromagnet, close to the string 302 Place a conductor (not shown) on the wire and apply voltage to the string and the conductor, It can be considered an electrostatic capacitance sensor for sensing a change in capacitance (Capacitance).

4-1 and 4-2 illustrate embodiments of the tension adjusting device 303 shown in FIG. In this embodiment, an example using magnetic force and electric force is shown, but any shape can be used as long as it can exert a force such as a shape memory alloy.

4-1 shows how to use the solenoid of the magnetic force method. The string 401 is connected to the iron core 402, and a solenoid (coil) 403 having a structure fitted to face the iron core 402 is attached to the support end 404. Depending on how much current is applied to the solenoid, it is possible to adjust the tension applied to the iron core 402. Although the solenoid is used as an example of the magnetic force in Fig. 4-1, it is also possible to use a rotating motor and a worm gear that use magnetic force.

4-2 shows how to apply tension to the string using electric force. One side of the string 411 has at least one electrically conductive conductor 412, and at least one opposite conductor 413 having a structure fitted with the conductor is attached to the support end 414. When a positive and negative voltage is applied to the conductor 412 and the conductor 413 opposite to the conductor 412, the conductors are pulled together to generate tension in the x direction, which is the right direction of FIGS. 2-4. The tension generated at this time can be adjusted as the magnitude of the voltage. The conductor 412 and the opposite amygdala 413 may have a rectangular shape, but the cross section of the conductor 412 may have a cylindrical shape, and the opposite conductor 413 may have a cylindrical shape such as a long ring. Alternatively, they may have a plate-like structure facing each other and apply voltages plus and minus. In other words, when the electric force is used, a voltage can be applied between the conductor attached to one side of the string and the conductor attached to the support end, and the shape of the electrode can be changed.

5 is one embodiment of another tension adjusting device of the musical instrument according to the present invention solves the problems that may occur in the structure such as 4-1, 4-2. In 4-1 and 4-2, the direction in which the string vibrates is the upward direction of the ground (ie, the y direction), so that when the string vibrates, the 402 or 412 attached to the string may move around. This movement may not produce the sound you want. One embodiment of FIG. 5 solves this problem. In FIG. 5, a tension adjusting device using magnetic force is configured as an example. String 501 is connected to the iron core 502, the solenoid 505 is located in a position facing the iron core 502, the solenoid 505 is attached to the support end 506, the iron core 502 is at least one guide structure 503 attached It consists of. The guide means 503 may be any structure that can be easily moved in the x direction to move the iron core and not easy to move in the y direction to move the iron core. For example, the guiding means 503 may be a string, or the string 501 may be inserted into a central portion having a thin film structure, and the outer portion of the thin film 503 of the cylindrical or square portion may be supported by the support 504. It can also be a bearing around the iron core.

Referring to FIG. 5, the string 501 vibrates at a resonant frequency of the string 501 by an external force (not shown) applied from the outside to excite the surrounding air to generate sound. At this time, if a current applied from the outside flows to the solenoid 505, the solenoid 505 generates a magnetic force to pull the iron core 502. At this time, the guide means 503 allows the iron core to move in the x direction by the magnetic force to hold the string strongly in the y direction to prevent the string from moving in the y direction, so that the string vibrates at the desired frequency to make a clean sound.

6 shows an embodiment of the musical instrument according to the present invention, which specifically illustrates the concept of the present invention shown in FIG.

Referring to Figure 6 in the configuration, the support end 601 has a string 602 having a mass 603, one side of the string is attached to the support end 602 on the left side, the other side of the string is connected to the tension adjustment window 604, the adjusting device The 604 is supported by another support end 601 on the right side, and the tension control device 605 is connected to the tension adjusting device 604 to send a control signal. A force generating means 606 capable of applying a force to the mass 603 is located at a position facing the mass 603, and the force generating means 606 is connected to the signal generator 607 to generate a signal to apply a force to the mass 603. do. In order to identify the vibration state of the string or the sound of occurrence, the sensor of 608 is placed near the mass 603, and the signal received from the sensor is sent to the receiving device 609, recorded, analyzed or sent to another device (not shown). . The mass 603 is for the excitation means 606 or the vibration / sound sensor 608 and in other embodiments the mass 603 may be eliminated.

This configuration will be described with reference to this configuration. When the signal is input to the excitation means 606 by a signal (not shown) generated by the signal generator 607, the excitation means 606 causes the mass to shake in accordance with the input signal. The input signal may be a signal of a wide frequency region, or may be a signal having one or two components of a specific region. When the string 602 is shaken by this signal, the tension applied to the string 602 by the tension adjusting device 604 and the tension control device 605 can be selected so that the vibration or sound generated from the string has only a specific frequency. The movement or sound of the string may be captured by using the appropriate vibration / sound sensor 608 and the receiver 609. The received signal may be fed back to the aforementioned tension controller 605 to adjust the string to move only at a specific frequency. Alternatively, it may be transmitted to another external device for recording or processing. As described above, the guide means 610 serves to support the string from moving in the y direction.

FIG. 7 shows a perspective view 700 of an embodiment of the musical instrument according to the present invention as a further embodiment of FIG. 6, and does not indicate the excitation means and the sensing means for convenience. The substrate 701 has a plurality of support ends 702, a string 703 is connected to a part of the support end 702, a mass 704 is attached to a part of the string 703, and a tension adjusting device 705 is attached to the other end of the string. Another string of guiding means 707 is attached to the string 703 such that the string vibrates mainly in the y direction, and the guide string 707 is fixed to another support 706.

Looking at the operation principle of the instrument having such a configuration, the string is applied by the excitation means (not shown) in the direction of the arrow 708 in the y direction, the string is a signal having a specific frequency or a specific bandwidth of the signal input by the excitation means Select and vibrate. This vibration is caused by the air, the instrument of the seven-degree configuration will give a beautiful sound. The height of the sound produced by the instrument can be adjusted by the string tension adjustment device. Depending on the excitation means (not shown) and the detection means (not shown), or the purpose, the mass 704 may be enlarged or eliminated at all. Of course, the length, thickness, cross section of the string can be changed in various ways to achieve the desired performance.

8 illustrates a method of applying tension to a string using an electric force as another embodiment of the musical instrument according to the present invention. The configuration is as follows. At least one chord 802 is connected to the support end 801, in the middle of the chord is a mass 803, and at the right end of the chord there is a plate 804 with one or more slots 807, inside the slot a support end (not shown). At least one electrode 805 supported is positioned, and the plate 804 is configured to have a plurality of guide strings 808 to prevent vibration in the y direction.

Referring to this configuration, the operation principle is as follows. The string 802 having the mass 803 is excited in the direction of the arrow 810 by an excitation means, which is not shown, and vibrates at the resonance frequency of the vibration system composed of the string and the mass. The movement or sound of the string may be detected by a sensing means not shown. When a voltage is applied to the plate 804 and the fixed electrode 105 to adjust the tension applied to the strings, a force is generated in the x direction to apply tension to the plurality of strings 802. The force is the electrical force generated by applying a positive and negative voltage to the conductor, and the force in the x direction at 8 degrees is due to the greater pull force on the narrow slot 806 than the electrical force generated by the wide slot 807. to be.

The concept and embodiments of the present invention have been described from 3 to 8 degrees. While acoustic instruments or musical instruments have been described so far, it has been felt that such devices can be used for other purposes as well. In other words, what has been described so far is that the external input is used as an Acoustic Filter that filters a specific frequency or a specific frequency band by a string, string, or mass, but it can be used as a filter to filter a signal using the same structure. Other uses of filters include electrical signal filters, biosignal filters, and the like. The electrical signal will be described with reference to FIG. 6. The same principle applies to protein filters that can be used in biosignal filters or DNA computers.

Since the configuration has been described above, only the principle will be described here.

Referring to the electrical signal filter using 6 degrees, the signal generator at 6 degrees represents a specific circuit in electronic products such as mobile phones. That is, the signal generator refers to a specific circuit for generating an electrical signal having a plurality of different frequencies in the antenna, and the receiver refers to a circuit portion which receives a specific frequency having a specific frequency in the electrical signal as a receiver. do.

When the signal generator 607 amplifies an electric signal having various frequencies generated from the mobile phone antenna and transmits the signal to the oscillator 606, the string 602 having the mass 603 vibrates at a specific resonance frequency by the tension adjusting device 604. The sensing device 608 detects only an electrical signal of a particular frequency to be received. This signal is processed by the receiving device 609, so that the voice, which is the original purpose of the mobile phone, can be reproduced.

Referring to the biosignal filter using 6 degrees, the signal generator in FIG. 6 means a specific part for generating a biosignal having various frequencies at the source of the biosignal, and the receiving apparatus identifies the biosignal in the biosignal. The receiving part having a specific frequency having a bandwidth is described as a receiving device.

The signal generator 607 amplifies a biosignal having various frequencies as it is or as an electric signal and transmits the force to the vibrator 606 to exert a force on the string. By this vibration, the sensing device 608 detects only an electrical signal of a particular frequency to be received. The signal may be processed by the receiving device 609 to be converted into another biosignal and transmitted or stored as it is.

This time, we will discuss protein filters that can be used in computers of the future using proteins such as DNA. The explanation is explained with reference to FIG. 6 using a DNA string. The DNA string 602 is fixed to the fixed end 601, and a tension adjusting device 604 for adjusting the tension of the DNA string is attached to the other end, and the tension control device 604 is connected to the tension control device 605 to apply tension to the DNA string. Adjust The mass portion 603 is another protein mass attached to the DNA string and may be omitted. To illustrate, the signal passing through the protein filter is an electric signal.

When the signal providing side to be processed inside the DNA computer is described as a signal generator, the electrical signal generated by the signal generator 607 is applied to 606, and the electric force is applied to the string 602 and the mass 603 by the electrostatic force. Under this force, the vibration system composed of the string 602 and the mass 603 vibrates at a specific frequency of the vibration system, is sensed by the sensing means 608, and sent to the receiving device 609 for processing. The receiver means another part of the DNA computer. The guide means 610 may or may not be in this case. The tension adjusting device 604 may be various, but it is preferable to form an electric field in the longitudinal direction of the string 602 so that the string is stretched. In this case, the tension adjusting device 604 locates an electrode (not shown) located slightly in the longitudinal direction of the string 602, and when a voltage is applied to the DNA string 602 and the electrode, the length of the string is between the string 604 and the electrode. The electric field in the direction is generated and the string is stretched. The tension applied to the string can be adjusted by adjusting the applied voltage.

Up to now, the method of actively pulling a string has described a musical instrument that is completely different from the existing musical instrument, and in this process, a filter that can be used for other users is presented. All of these inventions, such as a simple substitution or change of material, are easily included in the scope of the present invention. For example, changing the tension of a string by applying heat using a shape memory alloy coil as a tension adjusting device, or changing a DNA string to another protein or polymer molecule, etc. are all within the scope of the present invention.

A musical instrument using a change in tension of a string was presented. In particular, a change in the tension of a string caused a change in the pitch of the sound generated in a string, and thus a musical instrument capable of producing a wide range of sounds even with fewer strings was presented. . Unlike conventional string instruments, in which the string length and tension are fixed, the string height is changed by changing the tension of the string using electric or magnetic force.

The principle of the present invention can be used as a bandwidth filter for electric signals and biological signals, and can also be used as a bandwidth filter for use in a DNA computer.

Claims (33)

A substrate; At least one support protruding from the substrate; At least one string having one side connected to one of the supports; Another side of the string is capable of actively adjusting the tension of the string in accordance with an external signal, the tension adjustment window is supported on the support; And a resonant frequency of the string can be arbitrarily changed by adjusting the tension of the string with the tension adjusting device. The musical instrument as set forth in claim 1, wherein the tension adjusting device adjusts the tension of the string by using a magnetic force. The musical instrument as set forth in claim 2, wherein the tension adjusting device using the magnetic force comprises an iron core and a solenoid coil. The musical instrument according to claim 2, wherein the tension adjusting device using the magnetic force uses a motor. The musical instrument as set forth in claim 1, wherein said tension adjusting device adjusts the tension of the string using an electric force. The musical instrument as set forth in claim 5, wherein the tension adjusting device using the electric force generates an electric force by applying a voltage to the facing plate. An instrument according to claim 5, wherein the tension adjusting device using the electric force has a structure in which one electrode is sandwiched between the other electrode. The musical instrument as set forth in claim 1, wherein the vibration characteristic of the string is changed by hanging a mass on a part of the string. The musical instrument as set forth in claim 1, wherein a part of the string does not vibrate in the vibrating direction of the string, and the tension generated by the tension adjusting device is provided with guide means for transmitting the tension to the string as it is. The musical instrument as set forth in claim 1, having an excitation means for applying a force to said string. The musical instrument as set forth in claim 10, wherein the signal generated by the excitation means is white noise having various frequency components. The musical instrument as set forth in claim 1, further comprising sensing means for sensing the movement of the string or the sound generated. 13. The musical instrument as set forth in claim 12, wherein the signal sensed by the sensing means is fed back to the tension adjusting device so that the string vibrates at a specific frequency. A substrate; At least one support protruding from the substrate; At least one string having one side connected to one of the supports; Another side of the string can be actively adjusted the tension of the string according to the external signal, the tension adjustment window that is supported by the support; Guide means for allowing a portion of the string to move in the direction of tension, but not in the direction of vibration of the string in a direction perpendicular to the string; Structure characterized in that configured to have. The structure according to claim 14, wherein the tension adjusting device adjusts the tension of the string by using a magnetic force. The structure according to claim 15, wherein the tension adjusting device using the magnetic force consists of an iron core and a solenoid coil. The structure according to claim 15, wherein the tension adjusting device using the magnetic force uses a motor. 15. The structure according to claim 14, wherein the tension adjusting device adjusts the tension of the string using an electric force. 19. The structure according to claim 18, wherein the tensioning device using the electric force generates an electric force by applying a voltage to the facing plate. 19. The musical instrument according to claim 18, wherein the tension adjusting device using the electric force has a structure in which one electrode is sandwiched between the other electrode. 15. The structure according to claim 14, wherein the tension adjusting device uses a lever. 15. The structure according to claim 14, wherein said tension adjusting device increases the force by combining a plurality of gears. 15. The structure of claim 14, wherein at least one mass is suspended in a portion of the string to vary the vibration characteristics of the string. 26. The musical instrument as set forth in claim 14 or 25, having an excitation means for exerting a force on said string or mass according to an external signal. The structure according to claim 24, wherein the signal generated by the excitation means is white noise having various frequency components. 15. The structure of claim 14, further comprising sensing means for sensing the movement or sound of said string. 27. The structure according to claim 26, wherein the signal sensed by the sensing means is fed back into the tension adjusting device so that the string vibrates at a specific frequency. A substrate; At least one support protruding from the substrate; At least one string having one side connected to one of the supports; Another side of the string is a tension adjustment device that can actively adjust the tension of the string according to the signal, the support portion; Guide means for allowing a portion of the string to move in the tensioned direction but not in the direction of vibration of the string in a direction perpendicular to the string; Improving the resonant frequency characteristics of the strings and attaching one or more masses to a portion of the strings; An excitation means for applying a force to the string and the mass as an external signal is input; And a sensing means for sensing the movement of the strings so as to pass only a signal having a specific bandwidth among external electrical signals. 29. The filter of claim 28, wherein the external signal before filtering is an acoustic signal. 29. The filter of claim 28, wherein the signal before filtering is an electrical signal. A substrate; At least one support protruding from the substrate; At least one string having one side connected to one of the supports; Another side of the string may be actively adjusting the tension of the string according to the signal, the tension adjustment window which is supported by the support; An excitation means for applying a force to the string and the mass as an external signal is input; And a sensing means for sensing the movement of the strings so as to pass only a signal having a specific bandwidth among external electrical signals. 32. The filter of claim 31, wherein the strings comprise a chain of DNA. 32. The filter of claim 31, wherein the string consists of a chain of organic matter.