KR101563202B1 - Sound generation apparatus using helmholtz resonance having function of adjusting resonance mode and the control method thereof - Google Patents

Abstract

The present invention relates to an apparatus having a function of adjusting a resonance mode for generating a sound and a method thereof. The device adjusts the volume of an outputted sound by adjusting Helmholtz resonance mode without controlling power supply applied to piezoelectric devices when outputting a sound by generating Helmholtz resonance caused by the vibration of the piezoelectric devices. The apparatus for generating a sound comprises: a case part which forms a resonance area having an opened upper part; a vibrating part which is installed in the resonance area; and a variable cover which forms at least one duct part to discharge the air in the resonance area and is mounted on the upper part of the resonance area. The apparatus can easily execute volume adjustment by adjusting the coupling of the variable cover part and the case part to vary the volume of the resonance area, and the volume of a sound can be optimally adjusted at the output of an alarm sound by each user, thereby improving user perception.

Description

TECHNICAL FIELD [0001] The present invention relates to a sound generating apparatus and a sound generating method using Helmholtz resonance having a resonance mode control function, and a sound generating apparatus using the Helmholtz resonance.

The present invention relates to a sound generating apparatus using Helmholtz resonance, and more particularly, to a sound generating apparatus using Helmholtz resonance, in which, when Helmholtz resonance is generated by vibration of a piezoelectric element to output sound, The present invention relates to a sound generating apparatus using Helmholtz resonance having a resonance mode adjusting function for controlling a volume of an output sound and a control method thereof.

Generally, a sound reproducing apparatus is routinely applied to a structure of a speaker that vibrates a diaphragm vibrating by a voice coil to reproduce a sound. However, such a speaker is uneconomical in a case where a large number of parts are required, assembly is complicated, and a simple alarm sound is to be output.

As a result, sound generating devices that replace voice coil and diaphragm with piezoelectric elements are being developed.

As described above, the sound generating apparatus using the piezoelectric element has a structure that generates sound by using the resonance due to the vibration of the piezoelectric element and the case structure. The sound generating device using the piezoelectric element thus constructed applies Helmholtz resonance when the air in the resonance region R is discharged to the duct portion by applying electric energy of a specific frequency to the piezoelectric element, and the response by the piezoelectric element and Helmholtz resonance And outputs the sound of the volume having the sum of the responses of the volume. Such a sound generating device is widely used as a personal portable communication terminal such as a mobile phone, a PDA, a notebook, or a buzzer for outputting a warning sound such as a door opening in a car.

An example of a sound generating device to which a conventional piezoelectric device is applied is disclosed in Korean Utility Model Registration No. 20-0269920 entitled " Piezoelectric buzzer having a piezoelectric effect function "(hereinafter referred to as Prior Art 1) and Korean Registered Utility Model No. 20-0404140 Quot; piezoelectric speaker "(hereinafter referred to as " piezoelectric speaker "

The conventional art 1 has a structure in which a stress absorbing portion for obtaining a physical force by vibration and shaking of a weight and a hook structure for inducing a four-way flow of a weight are formed on one side of the case Discloses a piezoelectric buzzer which has not only a sound generation but also a vibration sensing function by a piezoelectric function.

The above-mentioned prior art 2 discloses a piezoelectric speaker in which a connection structure of a piezoelectric vibrator and an AC signal input terminal for applying an AC signal to the piezoelectric vibrator is improved to protect the piezoelectric vibrator.

The acoustic transducer or sound generating apparatus to which the above-described prior art piezoelectric element is applied is also configured to generate sound by making the case have a structure that causes Helmholtz resonance. And the adjustment of the sound is performed by adjusting the voltage of the AC power applied to the piezoelectric element.

In this case, the sound generating apparatus using the piezoelectric element of the related art has a fixed value of the voltage and current of the power source applied to the piezoelectric element, and after the case is manufactured, the volume of the resonance region and the cross- So that the Helmholtz resonance can not be changed and the sound can not be smoothly adjusted.

In addition, since the voltage of the input power source must be constantly adjusted for sound control, unnecessary power consumption occurs. Such unnecessary power consumption may cause battery discharge or the like in the case of a battery-powered device.

In addition, when the sound generating apparatus of the related art is applied for outputting a warning sound, since the user can not perform the adjustment of the warning sound when the sound is small, it is difficult to recognize the warning sound, I have a problem.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a piezoelectric vibrator capable of easily adjusting the volume of a sound generating device using Helmholtz resonance by adjusting a volume of a resonance region without adjusting a power source applied to the piezoelectric element And to provide a sound generating device and a sound generating method using Helmholtz resonance having a resonance mode adjusting function.

The present invention also provides a sound generating device and a sound generating method using Helmholtz resonance having a resonance mode adjusting function that significantly improves the utility of a sound generating device by significantly widening the volume of a sound generating device using Helmholtz resonance Provide for other purposes.

Further, the present invention can control the volume of the warning sound to be good enough for the user to recognize, thereby improving the user's perception of the warning sound in the driving or other industrial field, Another object of the present invention is to improve a sound generating device and a sound generating method using Helmholtz resonance.

According to an aspect of the present invention, there is provided a sound generating apparatus using Helmholtz resonance, comprising: a case portion forming a resonance region having an open top; A vibration unit mounted on the resonance region; And a variable cover portion having at least one duct portion to which the air of the resonance region is discharged and which is mounted on the upper portion of the resonance region, wherein the coupling portion of the variable cover portion with respect to the case portion is controlled, So as to be variable in volume.

The vibration unit may be a diaphragm having a piezoelectric element or a voice coil.

The variable cover portion is formed in a tubular shape having one side opened and the duct portion penetrated so as to be spaced apart from each other along the side portion.

A male screw portion is formed on the outer peripheral surface of the lower end portion of the variable cover portion and a female screw portion is formed on an inner peripheral surface of the case portion forming the resonance region to which the lower end portion of the variable cover portion is engaged, .

And the duct portion is formed to a lower end portion opposite to the case portion of the variable cover portion so that the volume of the resonance region and the cross-sectional area of the duct portion are variable by the variable cover portion.

Further, the sound generating device may include: A driving part for varying a coupling position of the variable cover part with respect to the case to vary the volume of the resonance area; And a volume control unit for controlling driving of the driving unit to adjust the volume.

The driving unit includes a motor and a pinion gear coupled to the motor, and the variable cover unit is formed with a rake-shaped fisher unit for engaging with the pinion gear.

According to an aspect of the present invention, there is provided a method of generating sound using Helmholtz resonance having a resonance mode control function, the method including: a case portion forming a resonance region having an open top; A vibration unit mounted on the resonance region; A variable cover portion having at least one duct portion through which air in the resonance region is discharged and mounted on the resonance region; A driving unit for varying a position of the variable cover unit; And a volume control unit for controlling driving of the driving unit, the method comprising: a volume signal receiving step in which the volume control unit receives a user input volume generating signal; A target volume corresponding response calculation step of calculating a response of the vibration part corresponding to the target volume of the volume signal and an air vibration response; A response corresponding resonance frequency calculating step of calculating a Helmholtz resonance frequency corresponding to the air vibration response; A resonance region volume calculation process of calculating the volume of the resonance region corresponding to the Helmholtz resonance frequency; And a variable cover part adjusting step of adjusting the position of the variable cover part such that the resonance area has a volume calculated in the resonance area volume arithmetic process.

The adjustment of the variable cover part may be performed by a manual operation by an operator or an automatic operation by a drive part.

According to an aspect of the present invention, there is provided a method of generating sound using Helmholtz resonance having a resonance mode control function, the method including: a case portion forming a resonance region having an open top; A vibration unit mounted on the resonance region; At least one duct portion through which the air in the resonance region is discharged is formed as a cut-away type having an opened bottom face, and is mounted on an upper portion of the resonance region; A driving unit for varying a position of the variable cover unit; And a volume control unit for controlling driving of the driving unit, the method comprising: a volume signal receiving step in which the volume control unit receives a user input volume generating signal; A target volume corresponding response calculation step of calculating a response of the vibration part corresponding to the target volume of the volume signal and an air vibration response; A response corresponding resonance frequency calculating step of calculating a Helmholtz resonance frequency corresponding to the air vibration response; A resonant region volume and a duct sectional area calculating process for calculating the volume of the resonant region corresponding to the Helmholtz resonant frequency and the sectional area of the duct portion; And a variable cover part adjusting step of adjusting a position of the variable cover part such that the resonance area and the duct part have a volume and a cross sectional area of the duct part of the resonance area calculated.

The variable cover part adjustment process may be performed either manually by an operator or automatic by a driver.

The present invention having the above-described configuration provides an effect of easily adjusting the volume of the sound generating device using Helmholtz resonance by adjusting the volume of the variable cover portion without adjusting the power source applied to the piezoelectric element.

In addition, the present invention significantly improves the efficiency of the sound generating apparatus by significantly increasing the volume of the sound generating apparatus using Helmholtz resonance.

In addition, the present invention can control the volume of the warning sound to be good enough for the user to recognize, thereby enhancing the user's perception of the warning sound in the driving or other industrial field, thereby remarkably improving the safety of the operation .

1 is a planar perspective view of a sound generator 100 according to an embodiment of the present invention.
2 is a bottom perspective view of the sound generator 100 of FIG.
FIG. 3 is a partial cross-sectional view of the sound generating device of FIGS. 1 and 2. FIG.
4 is a perspective view of the first variable cover portion 120a according to the first embodiment.
5 is a perspective view of the second variable cover portion 120b according to the second embodiment.
6 shows a state in which the second variable cover portion 120b and the case portion 110b of the structure of the sound generating device 100a, which is coupled to the case portion 110 where the second variable cover portion 120b forms a resonance region, FIG.
7 is a conceptual diagram of Helmholtz resonance;
8 is a view showing a superimposed state of a response H1 of the piezoelectric element unit 140 as a vibration section and an air response H2.
9 is a view showing a state in which a response H1 of the piezoelectric element unit 140 as a vibration section and an air response H2 are separated.
10 is a view illustrating a state in which the variable cover part 120c and the case part 110 of the sound generating device 100b having the automatic position varying function of the variable cover part 120c according to another embodiment of the present invention form a resonance area Only partly joined state.
11 is a flowchart showing a process of a sound generating method using Helmholtz resonance having a resonance mode adjusting function according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of the present invention.

1 is a bottom perspective view of the sound generator 100 of FIG. 1, and FIG. 3 is a perspective view of the sound generator 100 of FIGS. 1 and 2, (100). ≪ / RTI >

1 to 3, the sound generating apparatus 100 includes a case 110 and a piezoelectric element unit (not shown) mounted on the resonance region R of the case 110, And a control unit 150 for controlling the vibration of the piezoelectric element unit 140. The control unit 150 controls the vibration of the piezoelectric element unit 140 to generate the Helmholtz resonance, .

The case 110 has a resonance region R in which a region where the piezoelectric element unit 140 is placed is formed as a cylindrical groove to form the overall shape of the sound generator 100. A female screw portion 113 is formed on the inner circumferential surface of the upper end of the cylindrical groove structure of the case portion 110 forming the resonance region R. [

The variable cover part 120 is formed with a plurality of duct parts 130 through which air is discharged to one side. A lower end of the variable cover portion 120 is formed with a male screw portion 123 on an outer circumferential surface thereof.

The variable cover portion 120 having the above structure is threadedly engaged with the female threaded portion 113 while the male threaded portion 123 is inserted into the resonance region R to define the volume of the resonance region R. [

The piezoelectric element portion 140 is mounted on the bottom surface of the resonance region R. [

The controller 150 includes a PCB circuit board and is configured to supply power for vibration to the piezoelectric element unit 140 according to an external warning output signal. And is connected to the piezoelectric element part 113 by the power line 151.

In the above configuration, the duct portion 130 of the variable cover portion 120 may be formed in various shapes. 4 and 5 show embodiments of the duct part 130. FIG. 4 is a perspective view of the first variable cover part 120a according to the first embodiment, and FIG. 5 is a perspective view of the second variable cover part 120a according to the second embodiment. Fig.

As shown in FIG. 4, the first variable cover part 120a has a plurality of first duct parts 130a of a through-hole type having a certain cross sectional area. When the first variable cover part 120a having the plurality of first duct parts 130a as described above is moved by the screw movement with respect to the case part 110, only the volume of the resonance area R is varied .

Also, the variable cover portion may be formed as a second variable cover portion 120b having a second duct portion 120b formed in a cut-away groove shape in a downward direction of the duct portion, as shown in FIG. The second variable cover portion 120b having the above-described structure is configured such that when the state position with respect to the case portion 110 is changed by the screw movement, not only the volume of the resonance region R but also the volume of the second duct portion 120b The amplitude of the Helmholtz resonance frequency F is increased as described later.

Next, the variation of the volume of the resonance region R and the cross-sectional area of the second duct portion 120b due to the positional displacement of the second variable cover portion 120b and the cross-sectional area of the second duct portion 120b, Explain.

6 shows a second variable cover portion 120b and a second variable cover portion 120b of the sound generating device 100a according to another embodiment of the present invention which are combined such that the second variable cover portion 120b is displaced to the case portion 110 forming the resonance region. And is a perspective view of the case part 110.

6, the second variable cover portion 120b in which the plurality of second duct portions 130b are formed is formed in such a manner that the upper end of the resonance region R of the case portion 110 is connected to the upper end of the second duct portion 130b Lt; / RTI > Therefore, when the second variable cover part 120b is moved by the screw movement with respect to the case part 110, not only the volume of the resonance area R but also the volume of the through hole of the second duct part 130b Sectional area also varies from the penetration height a of the second duct portion 130b to the total height b. Therefore, as described above, the amplitude of the Helmholtz resonance frequency f is increased.

Hereinafter, the concept of the Helmholtz resonance applied to the present invention and the case portion 110 of the variable cover portions 120, 120a and 120b will be referred to as the resonance region R only, The variation of the Helmholtz resonance frequency according to the volume and the sectional area change of the second duct portion 130b will be described.

7 is a conceptual diagram of Helmholtz resonance.

7, the Helmholtz resonance frequency F is a value obtained by dividing the air in the resonance region R having a constant volume V by a predetermined length L and a cross-sectional area A, as shown in the following equation (1) The discharged air is obtained as a function of the volume V of the resonance region R and the cross sectional area A and the length L of the duct portion 130. [

here,

F: Helmholtz resonance frequency of the air discharged through the duct portions 130, 130a and 130b,

c: speed of sound waves in air,

L: Length of the duct portions 130, 130a, 130b (thickness of the variable cover portions 120, 120a, 120b forming the duct portion 130)

A: the sectional area of the duct portions 130, 130a, 130b

V is the volume of the resonance region R defined by the variable cover portions 120, 120a and 120b and the case portion 110. [

That is, the sound generating apparatuses 100, 100a, 100b of the present invention having the Helmholtz resonator tube structure of FIG. 7 described above can be applied to a case where air in the resonance region R is discharged through the duct portions 130, 130a, To generate a sound response having the resonant frequency of Equation (1).

Therefore, the sound generating apparatus 100, 100a, 100b of the present invention is discharged through the duct portions 130, 130a, 130b by the response H1 by the fixed vibration of the piezoelectric element unit 140 and the structure of the helmholtz resonance tube The volume of the sound produced by the sum of the Helmholtz resonance responses H2 of the air is adjusted (see FIGS. 8 and 9).

This process of adjusting the sound volume will be further described with reference to FIGS. 8 and 9. FIG.

Fig. 8 is a view showing the resonance state of the response H1 of the piezoelectric element unit 140 as the vibration unit and the resonance state of the air response H2. Fig. 9 is a graph showing the response H1 of the piezoelectric element unit 140 as the vibration unit, And the response H2 is separated.

First, the volume control of the sound generating device in which only the volume of the resonance region R is variable like the first variable cover portion 120a of FIG. 4 will be described.

The control unit 150 causes the piezoelectric element unit 140 to oscillate at a fixed frequency having a H1 response. Therefore, the frequency of the piezoelectric element unit 140 is fixed, and the response H1 of the piezoelectric element unit 140 has a fixed value.

At this time, the position of the first variable cover portion 120a of FIG. 4 is shifted so that the Helmholtz frequency F of Equation (1) has the same value as the frequency of the piezoelectric element portion 140, As shown in Fig. 8, when the volume is changed, the response H2 of the Helmholtz resonance frequency F of air and the response H1 of the piezoelectric element 140 are overlapped on the same frequency to increase the volume.

Alternatively, the position of the first variable cover portion 120a of FIG. 4 may be shifted so that the Helmholtz frequency F of Equation (1) is different from the frequency of the piezoelectric element portion 140, ), The response of the Helmholtz resonance frequency of air and the response of the piezoelectric element unit 140 are located on different frequencies as shown in Fig. Therefore, the volume becomes smaller. At this time, since the volume becomes smaller as the overlap region of the response H1 of the piezoelectric element unit 140 and the response H2 of the air due to the Helmholtz resonance becomes smaller, the resonance frequency of Helmholtz resonance becomes smaller, By adjusting the position of the portion 120a, a smaller volume of sound is generated.

Next, a case where the cross-sectional area of the duct portion 120b and the volume of the resonance region R are simultaneously changed by the second variable cover portion 120b of Fig. 5 will be described.

The cross sectional area A of the second duct portion 120b and the volume V of the resonance region R corresponding to the Helmholtz frequency F which is the same as the vibration frequency of the piezoelectric element unit 140 The position of the second variable cover portion 120b is changed. In this case, as shown in FIG. 8, the response H1 of the piezoelectric element unit 140 and the response H2 of the air having the Helmholtz frequency F overlap with each other and the volume increases.

The volume of the resonance region R and the cross-sectional area A of the second duct portion 120b that generate the Helmholtz frequency F that is different from the vibration frequency of the piezoelectric element portion 140, The response H1 of the piezoelectric element unit 140 and the response H2 of the air having the Helmholtz frequency F are separated from each other and the volume is reduced as shown in Fig. 9 when the position of the variable cover part 120b is varied.

When the cross-sectional area of the duct portion and the volume V of the resonance region R are simultaneously varied as in the case of the second variable cover portion 120b of Fig. 5, the volume adjustment speed is improved.

10 is a perspective view showing a state in which the third variable cover portion 120c of the sound generator 100b having the function of changing the position of the variable cover portion according to another embodiment of the present invention is combined with only the portion forming the resonance region of the case portion 110 State diagram.

The sound generating apparatuses 100 and 100b of FIGS. 1 to 6 are configured to manually change the position of the variable cover portions 120, 120a and 120b.

Alternatively, the sound generating device of the present invention may be configured to automatically adjust the variable cover portion by the driving portion. This provides the convenience of automatically adjusting to the volume when the user adjusts the volume control knob.

For this automatic volume control, the sound generator 100b of Fig. 10 has the same configuration as that of Fig. 4 or Fig. 5 and additionally has a rake-shaped fisher portion 122 are formed on the upper surface of the third variable cover portion 120c. And a drive unit 200 including a pinion gear 220 meshing with the pinion gear 122 and a motor 210 rotating the pinion gear 220 is configured on one side. The volume control unit 300 is configured to output the position change signal of the third variable cover unit 120c for varying the volume V of the resonance region R or the cross sectional area of the duct unit by the driving unit 200. [ The volume control unit 300 generates a Helmholtz resonance frequency such that the sum of the response H1 of the piezoelectric element unit 140 and the air response H2 corresponding to the user input volume has a volume corresponding to the user input volume The volume V of the resonance region R or the area of the duct sectional area A is calculated and the position of the corresponding third variable cover portion 120c is calculated and then the calculated third variable cover portion 120c is calculated, And outputs a signal to the driving unit 200 to move the third variable cover unit 120c. The motor 210 may be configured as a stepping motor for accurate positional movement of the third variable cover portion 120c. Further, a position measuring device such as an encoder for detecting the positional shift of the third variable cover portion 130c may be further configured.

11 is a flowchart showing a process of a sound generating method using Helmholtz resonance having the resonance mode adjusting function of the present invention.

11 is a processing procedure of a sound generating method by the sound generating apparatus 100b of Fig.

As shown in FIG. 11, in the sound generating method of the present invention, when performing volume adjustment of a user from the outside, the volume control unit 300 performs a volume signal receiving process (S100) to receive a volume signal.

The volume control unit 300 receiving the volume signal by the volume signal reception process S100 calculates a response corresponding to the user input volume. At this time, since the vibration frequency of the piezoelectric element unit 140 is fixed, the response of the piezoelectric element unit 140 is fixed to a fixed value H1 at the same frequency as in FIGS. The frequency of the Helmholtz resonance in the resonance region R can be varied according to the following formula 1 when the volume V of the resonance region R and the cross sectional area A of the duct portion 130 are variable as shown in Fig. do. The response of the resonance region R varies as shown in Fig. 9 in accordance with the change of the volume V of the resonance region R and the cross-sectional area A of the duct portion 130. [ The volume control unit 300 calculates a response H2 based on the Helmholtz resonance frequency such that the sum of the response H1 of the piezoelectric element unit 140 and the response H2 of the air due to the Helmholtz resonance frequency becomes the user input volume . This process is the volume corresponding response calculation process (S200) of FIG.

Thereafter, the volume control unit 300 calculates a Helmholtz resonance frequency F for generating a response H2 based on the Helmholtz resonance frequency by performing a response-corresponding resonant frequency calculating process S300.

When the sound generator is configured to vary only the volume of the resonance region R after the Helmholtz resonance frequency F is calculated as shown in Fig. 4, the resonance frequency of the resonance region R corresponding to the Helmholtz resonance frequency F A resonance region volume calculation process (S400) is performed.

5, when the volume V of the resonance region R and the cross-sectional area A of the duct portion 130 are both variable, the sound generating device corresponds to the Helmholtz resonance frequency F The volume V of the resonance region R and the cross-sectional area of the duct portion 130 are calculated.

Thereafter, the volume control unit controls the volume V of the resonance region R or the resonance region R, which generates the target response calculated by the resonance region volume calculation process S400 or the resonance region volume and the duct sectional area calculation process S500, To the driving unit 200 to output the driving signal for moving the position of the third variable cover part 120c so as to have the volume V of the first cover part 120a and the sectional area A of the duct part, (S600), thereby causing the sound generating apparatus to generate a sound having a user input volume.

According to the above-described configuration, in the prior art, it is improved to output only a fixed response in response to a warning sound of a general device or a warning sound output from a warning device, So that the user's convenience of use and the ability to recognize the user's situation are significantly improved.

100, 100a, 100b: sound generating device 110: case part
120, 120a, 120b, 120c: variable cover portions (first to third variable cover portions)
113: female thread portion 122: rack portion
123: male thread portion 130: duct portion
140: Piezoelectric element part 150: Control part
200: driving unit 210: motor
220: Pinion gear 300: Volume control unit

Claims (10)

A case portion forming a resonance region in which an upper portion is opened;
A vibration unit mounted on the resonance region; And
And a variable cover portion having at least one duct portion through which air in the resonance region is discharged and mounted on an upper portion of the resonance region,
A variable cover portion coupled to the housing portion to adjust the volume of the resonant region by adjusting coupling of the variable cover portion to the case portion,
A driving part for varying a coupling position of the variable cover part with respect to the case to vary the volume of the resonance area; And
And a volume control unit for controlling driving of the driving unit to adjust the volume of the sound generated by the resonance mode adjusting unit.
[2] The apparatus according to claim 1,
Wherein the duct portion is formed in a tubular shape with one side opened and the duct portion being formed to be spaced apart from each other along the sides of the side portion.
The method according to claim 1,
A male screw portion is formed on an outer peripheral surface of a lower end portion of the variable cover portion,
Wherein a female screw portion is formed on an inner circumferential surface of the case portion forming the resonance region to which the lower end portion of the variable cover portion is engaged,
And the volume of the resonance region is variable according to the rotation of the variable cover portion. ≪ RTI ID = 0.0 > 8. < / RTI >
[2] The apparatus according to claim 1,
Wherein the variable cover portion is formed so as to extend to a lower end portion opposite to the case portion of the variable cover portion so that the volume of the resonance region and the cross-sectional area of the duct portion are variable together. Sound Generating Device Using Resonance.
delete The method according to claim 1,
Wherein the driving unit includes a motor and a pinion gear coupled to the motor,
Wherein the variable cover portion is formed with a rake-shaped fisher portion in which the pinion gear meshes with the variable cover portion.
A case portion forming a resonance region in which an upper portion is opened; A vibration unit mounted on the resonance region; A variable cover portion having at least one duct portion through which air in the resonance region is discharged and mounted on the resonance region; A driving unit for varying a position of the variable cover unit; And a volume control unit for controlling driving of the driving unit, the sound generating method comprising:
A volume signal receiving step in which the volume control unit receives a user input volume generating signal;
A target volume corresponding response calculation step of calculating a response of the vibration part corresponding to the target volume of the volume signal and an air vibration response;
A response corresponding resonance frequency calculating step of calculating a Helmholtz resonance frequency corresponding to the air vibration response;
A resonance region volume calculation process of calculating the volume of the resonance region corresponding to the Helmholtz resonance frequency; And
And adjusting the position of the variable cover part so that the resonance area has a volume calculated in the resonance area volume arithmetic process. [7] The method according to claim 1, Generation method.
8. The method of claim 7,
And the position of the variable cover part can be performed by a manual operation by an operator or an automatic operation by a driving part. The sound generating method using Helmholtz resonance having the resonance mode adjusting function.
A case portion forming a resonance region in which an upper portion is opened; A vibration unit mounted on the resonance region; At least one duct portion through which the air in the resonance region is discharged is formed as a cut-away type having an opened bottom face, and is mounted on an upper portion of the resonance region; A driving unit for varying a position of the variable cover unit; And a volume control unit for controlling driving of the driving unit, the sound generating method comprising:
A volume signal receiving step in which the volume control unit receives a user input volume generating signal;
A target volume corresponding response calculation step of calculating a response of the vibration part corresponding to the target volume of the volume signal and an air vibration response;
A response corresponding resonance frequency calculating step of calculating a Helmholtz resonance frequency corresponding to the air vibration response;
A resonant region volume and a duct sectional area calculating process for calculating the volume of the resonant region corresponding to the Helmholtz resonant frequency and the sectional area of the duct portion; And
And adjusting a position of the variable cover portion so that the resonance region and the duct portion have a volume and a duct sectional area of the resonance region calculated. Sound Generating Device Using Resonance.
[12] The method of claim 9,
Wherein the resonance mode adjusting function is performed by a manual operation by an operator or an automatic operation by a driving unit.

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