JP2015200909A - silencer - Google Patents

silencer Download PDF

Info

Publication number
JP2015200909A
JP2015200909A JP2015129492A JP2015129492A JP2015200909A JP 2015200909 A JP2015200909 A JP 2015200909A JP 2015129492 A JP2015129492 A JP 2015129492A JP 2015129492 A JP2015129492 A JP 2015129492A JP 2015200909 A JP2015200909 A JP 2015200909A
Authority
JP
Japan
Prior art keywords
sound
performance
silencer
main
cylindrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2015129492A
Other languages
Japanese (ja)
Inventor
末永 雄一朗
Yuichiro Suenaga
雄一朗 末永
Original Assignee
ヤマハ株式会社
Yamaha Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ株式会社, Yamaha Corp filed Critical ヤマハ株式会社
Priority to JP2015129492A priority Critical patent/JP2015200909A/en
Publication of JP2015200909A publication Critical patent/JP2015200909A/en
Pending legal-status Critical Current

Links

Images

Abstract

A high performance silencer is provided. A main body including a cylindrical portion attached so that an outer peripheral surface thereof is in contact with an inner peripheral surface of a bell of a brass instrument and a closing portion that closes one end portion of the cylindrical portion. A performance adjusting pipe that extends from the closing portion 12 to the outside of the main body 10, opens the first end 20 a near the closing portion 12 inside the main body 10, and opens the second end 20 b outside the main body 10. 20. The performance adjusting pipe 20 is shorter than the half wavelength of the highest sound within the practical sound range of the brass instrument. [Selection] Figure 1

Description

  The present invention relates to a silencer.

  2. Description of the Related Art Conventionally, silencers that are attached to a brass instrument so that the outer peripheral surface of the silencer is in contact with the inner peripheral surface of the bell of the brass instrument are known. For example, in Patent Document 1, in a silencer having an internal space composed of a bowl-shaped bottom and a body, an exhalation discharge passage portion having a predetermined length that communicates with the internal space and discharges exhalation to the external space is provided. Disclosed arrangements are disclosed.

Japanese Patent No. 4114171

In the prior art, the exhalation discharge passage is open near the end surface of the bowl-shaped bottom. However, the sound output from the opening to the outside of the silencer body is reflected by the outer wall surface of the silencer body, the inner wall surface of the brass instrument bell, etc., and mainly forward (forward as viewed from the performer). It has been difficult to improve the sound deadening efficiency of the sound and improve the silencing performance.
The present invention has been made in view of the above problems, and an object thereof is to provide a high-performance silencer (including a weak silencer).

  In order to achieve the object, in the present invention, a main body including a cylindrical portion attached so that an outer peripheral surface thereof is in contact with an inner peripheral surface of a bell of a brass instrument, and a closing portion that closes one end portion of the cylindrical portion; A performance adjusting pipe that extends from the closed portion to the outside of the main body, opens at the first end near the closed portion inside the main body, and opens at the second end outside the main body.

  That is, by attaching the outer peripheral surface of the cylindrical portion constituting the silencer to the inner peripheral surface of the bell of the brass instrument, there is no gap between the outer peripheral surface of the silencer and the inner peripheral surface of the bell. It is configured so that exhalation does not leak. For this reason, it is necessary to discharge the exhalation of the performer, and the body of the silencer is configured to be hollow by the tubular portion and the closed portion, and the end portion of the tubular portion on the side where the closed portion does not exist By opening, the player's breath is introduced from the brass instrument into the silencer body. Furthermore, since the first end of the performance adjustment pipe opens inside the main body and the second end opens outside the main body, the player's breath can be expelled from the first end into the performance adjustment pipe. And discharged from the second end to the outside of the main body.

  The performance adjusting pipe that constitutes such a silencer extends from the closed portion to the outside of the main body, so that the second end, which is one of its ends, is opened to the outside of the main body. It is attached. That is, the second end portion is present at a position away from the closing portion, and sound is output from the second end portion opened at a position away from the closing portion. Therefore, when the performer plays the brass instrument with the silencer attached to the brass instrument, the sound output from the second end is spread in a spherical shape. For this reason, it is possible to provide a high-performance muffler with high sound deadening performance without projecting the sound radiation efficiency in a specific direction.

  Here, the cylindrical portion constituting the silencer main body is attached so that the outer peripheral surface of the cylindrical portion is in contact with the inner peripheral surface of the bell of the brass instrument, so that the outer peripheral surface of the silencer and the inner periphery of the bell What is necessary is just to be comprised so that a player's exhalation may not leak from between the surfaces. Therefore, a member that enhances contact with the inner peripheral surface of the bell may be attached to the outer peripheral surface of the cylindrical portion, and the outer peripheral surface changes more slowly than the bell shape along the shape of the bell of the brass instrument. (For example, the diameter of the outer periphery gradually increases more gradually than the bell toward the outside). Moreover, the cylindrical part should just be a member comprised so that the both ends of an axial direction may open because a thin plate-shaped wall surface exists in the circumference | surroundings of an axis | shaft, A raw material, an outer peripheral diameter, and an inner peripheral diameter are not limited. .

  The closing part may be a wall surface that closes one end of the cylindrical part. For example, a configuration in which a thin plate-like member is attached to one end of the cylindrical part can be adopted. That is, the end opposite to the end (one end) of the cylindrical part to which the blocking part is attached is inserted into the brass instrument, and the outer peripheral surface of the cylindrical part is set to the inner peripheral surface of the bell of the brass instrument. It is comprised so that a main body may be attached to a brass instrument by making it contact. As a result, the closed part is exposed to the outside of the brass instrument, and the end of the cylindrical part opposite to the closed part is hidden inside the brass instrument, for example, a trumpet, the closed part is opposite to the player. It will be in the state where it is arranged on the side and the end of the cylindrical part opposite to the closed part is arranged on the player side. Of course, the closed part and the cylindrical part may be formed integrally, or a structure in which the closed part and the cylindrical part, which are separate bodies, are connected. In addition, it attaches so that the outer peripheral surface of the cylindrical part which comprises a silencer may contact the inner peripheral surface of the bell of a brass instrument, and the edge part (one end part) of the said cylindrical part is obstruct | occluded by the obstruction | occlusion part. In the silencer having the configuration, the blocking portion serves as a reflection surface of sound output from the brass instrument. In this configuration, the position where the silencer is attached to the brass instrument is adjusted so that the pitch of the sound output from the brass instrument when the silencer is used and the brass instrument when the silencer is not used. Variation in the pitch of the output sound can be suppressed.

  The performance adjusting pipe is a pipe whose both ends are opened so that the first end opens inside the main body and the second end opens outside the main body, and extends from the closed portion to the outside of the main body. It only has to be configured. In other words, the performance adjustment pipe only needs to be configured so that the second end portion opens at a position away from the blocking portion, and the performance adjustment pipe is exposed so that at least a part of the performance adjustment pipe is exposed to the outside of the main body. A pipe is attached to the obstruction. Of course, the performance adjustment pipe may extend linearly from the closed portion, or at least a part thereof may be bent.

  The first end only needs to be opened inside the main body, but if the position where the first end opens inside the main body is adjusted, the performance of the silencer can be improved. For example, the closed portion serves as a reflection surface for sound output by a brass instrument, and on the inner side of the silencer, the sound wave of the direct sound traveling toward the closed portion and the reflected sound from the closed portion are advanced toward the performer. It becomes the state where the sound wave of the reflected sound coexists. Therefore, the sound wave of the direct sound and the sound wave of the reflected wave coexist in the vicinity of the first end portion of the performance adjusting pipe that opens inside the silencer. For this reason, when twice the distance between the first end and the closed portion (the path difference between the direct sound and the reflected sound) is an odd multiple of a half wavelength of the sound wave or an integer multiple of the wavelength, The reflected sound wave interferes, and the sound wave becomes excessively small or large. As a result, a sound wave having a dip or a peak is output from the performance adjustment pipe at a specific frequency corresponding to the distance between the first end portion and the closed portion.

  Therefore, if the first end portion is arranged in the vicinity of the blocking portion, the dip or peak can be configured not to occur in the audible sound. In other words, when the first end of the performance adjustment pipe is disposed inside the silencer main body, the performance adjustment pipe is attached to the main body with the first end disposed in the vicinity of the closing portion. can do. If the first end portion is arranged in the vicinity of the occlusion portion, a frequency that becomes a dip or a peak (a specific frequency corresponding to the distance between the first end portion and the occlusion portion) is set as a frequency outside the audible range. Can do.

  Specifically, if the distance between the first end and the inner wall of the closed part is set to about several mm, the distance between the first end and the inner wall of the closed part causes interference with sound in the audible range. There can be no distance. That is, in order to make the path difference (twice the distance between the first end and the inner wall of the blocking portion) equal to wavelength / 2, the distance between the first end and the inner wall of the blocking portion is set to the wavelength. / 4. Therefore, if the upper limit frequency of the audible sound is 5 kHz, the wavelength is 0.068 m (= 340/5000) when the sound speed is 340 m / s, and the first end portion and the inner wall of the closed portion If the distance is smaller than 17 mm, which is a wavelength of / 4, a sound having a dip or a peak with wrinkles in the audible sound wave is not output from the performance adjustment pipe. Further, if the upper limit frequency of the sound in the audible range is 20 kHz, the wavelength is 0.017 m (= 340/20000) when the sound speed is 340 m / s, and the first end portion and the inner wall of the closed portion By making the distance smaller than 4.25 mm, which is a wavelength of / 4, audible sound waves with dip and peaks are not output from the performance adjustment pipe. Therefore, a high performance silencer can be provided.

  Furthermore, when performing using the silencer, the performer outputs a sound by vibrating the gas present between the mouthpiece and the silencer. In the silencer equipped with a performance adjustment pipe, As the length of the performance adjusting pipe is longer, the degree of freedom in generating gas vibration can be easily suppressed. Therefore, the longer the length of the performance adjustment pipe, the easier it is to stabilize the sound waves generated in the silencer.

  On the other hand, it has been found that if the length of the performance adjusting pipe is excessively increased, the performance of the silencer deteriorates. That is, there are practical sounds used for actual performance in brass instruments, and if the length of the performance adjustment pipe is excessively increased, the length of the performance adjustment pipe becomes a length that can resonate with the practical sound. In such a case, the energy given to the gas by the performer during the performance of the brass instrument is consumed by the resonance, and the energy for outputting the original performance sound is lost. Therefore, if the length of the performance adjusting pipe is set to a length that does not resonate with each practical sound of the brass instrument, it is possible to provide a silencer that can be played comfortably without causing energy loss.

  As described above, in order to make the performance adjusting pipe so long that it does not resonate with each practical sound of the brass instrument, the frequency of the sound used in the brass instrument is discrete (there is a frequency difference between C and C #). The length of the performance adjustment pipe may be set so that the sound wave having a frequency between discrete frequencies and the performance adjustment pipe can resonate. That is, the length of the performance adjusting pipe may be different from the half wavelength of each practical sound of the brass instrument.

  Further, in order to make the performance adjustment pipe so long that it does not resonate with the practical sound of the brass instrument, the performance adjustment pipe may be shorter than the half wavelength of the highest sound within the practical sound range of the brass instrument. That is, with this length, the performance adjusting pipe can be configured so as not to resonate substantially with respect to all the sounds in the practical range of the brass instrument. For example, assuming that the highest sound in the practical sound range of the trumpet is about 920 Hz and the sound speed is 340 m / s, ½ of the wavelength of the highest sound in the practical sound range is about 185 mm (185≈ (340/920/2) × 1000). Therefore, if the length of the performance adjusting pipe is made shorter than 185 mm, the performance adjusting pipe can be made shorter than the half wavelength of the highest sound within the practical sound range of the trumpet.

  Of course, the maximum sound in the practical range can be changed depending on the performer and the purpose of the performance. For example, when the maximum sound in the practical range is 1050 Hz in the case of jazz performance, the length of the performance adjustment pipe is 162 mm ( A configuration of shorter than 162≈ (340/1050/2) × 1000) may be employed.

  Further, the second end portion is arranged so that the sound output from the opening of the second end portion is radiated in a spherical shape, that is, in a radial direction including the rear rather than a hemisphere only in the front. As long as the position is set, various positions can be adopted. As an example, the performance adjusting pipe may be configured so that the second end portion is opened in a space closer to the performer than the end surface of the bell by being bent outside the silencer main body. According to this configuration, since the main sound is output in the backward direction, the sound waves traveling in front of the performer can be relatively reduced, and the silencing performance in front of the performer can be improved.

FIG. 3 is a cross-sectional view of a silencer. (2A) (2B) is a figure for demonstrating the influence which the relationship between an obstruction | occlusion part and a sound source position has on the frequency characteristic of sound. It is sectional drawing of a silencer. It is sectional drawing of a silencer. It is sectional drawing of a silencer.

Here, embodiments of the present invention will be described in the following order.
(1) Silencer configuration:
(2) Performance adjustment pipe length:
(3) Other embodiments:

(1) Silencer configuration:
FIG. 1 is a diagram showing a silencer according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of the silencer mounted on the bell 1 of the trumpet cut along the axis of the trumpet tube. The silencer according to the present embodiment includes a main body 10 including a cylindrical portion 11 and a closing portion 12, and a performance adjusting pipe 20 is attached to the closing portion 12. In addition, a pitch adjustment member 31 for pitch adjustment is attached to the main body 10.

  The cylindrical part 11 is comprised by the plate-shaped member, and is a shape from which an internal diameter and an outer diameter change gradually along an axis | shaft. That is, the cylindrical portion 11 has a substantially truncated cone shape, and in this embodiment, the wall surface corresponding to the side surface of the truncated cone is not a straight line but a curved line in the cross section shown in FIG. Changes. Further, one end portion in the axial direction of the cylindrical portion 11 has a larger inner diameter than the other end portion. In the present embodiment, the closing portion 12 is connected to the end portion 14 (end corresponding to the lower bottom) having the larger inner diameter, and the end portion 13 (end corresponding to the upper bottom) having the smaller inner diameter is opened. doing. Therefore, the main body 10 is a hollow member having one end opened.

  The closing part 12 is composed of a plate-like member, and the outer surface of the closing part 12 exposed to the outside of the main body 10 has a substantially bowl shape. A hole is formed at the center of the blocking part 12 (intersection of the axis of the cylindrical part 11 and the blocking part 12), and a boss 12a having a cylindrical hole is attached to the hole.

  The pitch adjusting member 31 is a member having a substantially truncated cone shape formed of a plate-like member, and in this embodiment, the side surface of the truncated cone is a straight line in the cross section shown in FIG. Further, the end 31b (end corresponding to the upper base) having the smaller inner diameter in the truncated cone of the pitch adjusting member 31 is closed, and the end 31a having the larger inner diameter (end corresponding to the lower base) is closed. Is open. Therefore, the pitch adjusting member 31 is also a hollow member having one end opened.

  Connecting members 31 c are attached to the inner wall of the end portion 31 a of the pitch adjusting member 31 and the inner wall of the end portion 13 of the tubular portion 11 at a plurality of positions. The connecting member 31c is a thin plate-like member and has a predetermined angular direction around the axis of the pitch adjusting member 31 and the cylindrical portion 11 (in the example shown in FIG. 1, 0 °, 90 °, 180 °, 270 °). Are attached to the pitch adjusting member 31 and the cylindrical portion 11 so that the surfaces of the thin plate-like members are oriented. That is, the end portion 13 of the cylindrical portion 11 and the end portion 31a of the pitch adjusting member 31 are fixed by a predetermined distance (X shown in FIG. 1) by the connecting members 31c arranged at a plurality of locations. It becomes a state.

  For this reason, the exhalation of the player flowing from the inside of the trumpet in the direction of the pitch adjusting member 31 and the tubular portion 11 passes between the end portion 13 of the tubular portion 11 and the end portion 31a of the pitch adjusting member 31. Is introduced into the cylindrical portion 11. Here, when the performer introduces exhalation by putting the lips on the mouthpiece attached to the trumpet, sound waves due to vibrations of the performer's lips propagate. A standing wave is generated inside the trumpet by this sound wave, and the pitch of the sound output from the trumpet is determined by the generated standing wave. Therefore, when the distance between the pitch adjusting member 31 and the cylindrical portion 11 is adjusted by adjusting the size of the connecting member 31c, the cross-sectional area of the path through which the sound wave propagates can be changed and output from the trumpet. It is possible to adjust the pitch of the sound.

  In the cylindrical portion 11 according to the present embodiment, a buffer material (resin such as sponge) 11a having a large friction coefficient is wound around the outer periphery. Further, the curvature of the cylindrical portion 11 is smaller in the change per unit distance in the axial direction than the curvature of the bell 1 of the trumpet to which the main body 10 is attached. Therefore, when the end portion 13 of the main body 10 is inserted into the bell 1 and the main body 10 is moved into the bell 1, the outer periphery of the cushioning material 11 a attached to the outer periphery of the cylindrical portion 11 will eventually become the inner periphery of the bell 1. Close contact with. When the main body 10 is further pushed into the bell 1 in this state, the cushioning material 11a is deformed and the main body 10 is fixed to the bell 1 by a frictional force.

  In the present embodiment, the thickness of the cushioning material 11a is a predetermined thickness, and the amount of deformation of the cushioning material 11a has a certain width, so that there is a certain width at the position where the main body 10 is fixed to the bell 1. Therefore, the pitch can be adjusted by adjusting the position where the main body 10 is fixed to the bell 1.

  The performance adjusting pipe 20 is a cylindrical member, and the axis from one end to the other end is linear. The outer periphery of the performance adjusting pipe 20 is slightly smaller than the inner periphery of the cylindrical hole of the boss 12a, and the performance adjusting pipe 20 can be inserted and fixed to the boss 12a. Since both ends (the first end portion 20a and the second end portion 20b) of the performance adjusting pipe 20 are open, when the first end portion 20a is inserted into the boss 12a, the first end portion 20a is a silencer. It opens inside the main body 10, and the second end portion 20b is opened outside the main body 10 of the silencer. As a result, in this embodiment, the exhalation of the performer introduced into the tubular portion 11 from the inside of the trumpet through the space between the end portion 13 of the tubular portion 11 and the end portion 31a of the pitch adjusting member 31 is Furthermore, it is introduced into the first end 20 a of the performance adjusting pipe 20. Then, exhaled air in the performance adjustment pipe 20 is discharged from the second end portion 20 b of the performance adjustment pipe 20 to the outside of the main body 10.

  In the above configuration, the performance adjusting pipe 20 is attached to the closing portion 12 so that the second end portion 20 b opens outside the main body 10 by extending from the closing portion 12 to the outside of the main body 10. For this reason, when the player plays the trumpet with the second end portion 20b away from the closing portion 12 and the silencer body 10 is attached to the trumpet, the second end portion 20b is output from the second end portion 20b. The sound spreads in a spherical shape. Therefore, the sound radiation efficiency in a specific direction (for example, the front) does not protrude and the muffling performance in the specific direction does not deteriorate, and it is possible to provide a high-performance muffler with high sound silencing performance. .

  Hereinafter, the effect by the sound being output from the second end 20b of the performance adjusting pipe 20 will be described with reference to the drawings. Here, frequency characteristics of sound pressure at a position 1 m away from a sound source having a diameter of 6 mm (same as the inner diameter of the performance adjusting pipe 20) placed in an anechoic chamber will be considered under three conditions. That is, the frequency characteristic at a position 1 m away from the sound source in a state where a member (a disk having a diameter of 80 mm) imitating the blocking portion 12 is not disposed around the sound source is assumed as a reference. This frequency characteristic is called a frequency characteristic under a reference condition.

  Next, the frequency characteristic at a position 1 m away from the sound source in a state where the sound source is arranged in the center of the member simulating the blocking portion 12 is referred to as a frequency characteristic under comparison conditions. Further, the sound source passes through the center of the member simulating the blocking portion 12 and is perpendicular to the member simulating the blocking portion 12 (equivalent to the central axis of the main body 10) at a position 90 mm from the member simulating the blocking portion 12. Assuming a state in which is placed, the frequency characteristic at a position 1 m away from the sound source on the axis is called the frequency characteristic under the implementation conditions.

  Note that the frequency characteristics under the comparison conditions are equivalent to the frequency characteristics when the sound output from the hole formed in the center of the member simulating the blocking portion 12 is measured at a distance of 1 m from the hole. In the configuration shown in FIG. 1, it can be regarded as a frequency characteristic equivalent to the situation in which the closed portion 12 performance adjustment pipe 20 is removed. In addition, the frequency characteristics under the implementation conditions are equivalent to the frequency characteristics when the sound output from the position 90 mm ahead of the member simulating the blocking portion 12 is measured at a distance of 1 m from the hole. It can be regarded as the frequency characteristic in the configuration shown in FIG.

  2A and 2B are diagrams for explaining the influence of the relationship between the blocking portion 12 and the sound source position on the frequency characteristics of the sound. In FIG. 2A, the frequency characteristics under the reference conditions are applied to the entire frequency range. The frequency characteristic under the comparison condition with respect to the case where the transition is 0 dB is indicated by a solid line, and the frequency characteristic under the execution condition when the frequency characteristic under the reference condition is 0 dB over the entire frequency range is indicated by a broken line. Note that frequency characteristics of less than 400 Hz and more than 20 kHz, in which no significant difference was observed between the frequency characteristics under the comparison conditions and the frequency characteristics under the implementation conditions, are omitted.

  Comparing the frequency characteristic under the comparison condition and the frequency characteristic under the execution condition based on FIG. 2A, the sound pressure under the comparison condition is almost equal to the sound pressure under the execution condition over almost the entire frequency range. Is bigger than. Therefore, in the silencer of the present embodiment in which the performance adjusting pipe 20 extends in front of the closing portion 12, the silencing performance in front of the trumpet is higher than the silencer to which the performance adjusting pipe 20 is not attached. Note that the noise level (dBA) has a frequency characteristic under comparison conditions that is about 6 dB greater than the frequency characteristic under reference conditions, and the frequency characteristic under implementation conditions is about 2 dB greater than the frequency characteristics under reference conditions. . Therefore, in the silencer of the present embodiment in which the performance adjusting pipe 20 extends in front of the closing portion 12, the silencing performance in front of the trumpet is higher than the silencer to which the performance adjusting pipe 20 is not attached.

  In FIG. 2B, the position at a distance of 1 m from the sound source is at a position inclined by 45 ° with respect to the axis in FIG. 2A (the axis passing through the center of the member simulating the closing portion 12 and perpendicular to the member simulating the closing portion 12). The frequency characteristics are shown. That is, in FIG. 2B, the frequency characteristic at a position where the position 1 m from the sound source is inclined by 45 ° with respect to the axis in FIG. 2A, and the frequency characteristic under the reference condition is 0 dB over the entire frequency range. The frequency characteristics under the comparison condition with respect to are indicated by a solid line, and the frequency characteristics under the reference condition under the condition of 0 dB over the entire frequency are indicated by the broken line. Comparing the frequency characteristic under the comparison condition and the frequency characteristic under the execution condition based on FIG. 2B, the sound pressure under the comparison condition is almost equal to the sound pressure under the execution condition over almost the entire frequency range. Is bigger than. Therefore, in the silencer of the present embodiment in which the performance adjusting pipe 20 extends in front of the closing portion 12, the silencing performance in front of the trumpet is higher than the silencer to which the performance adjusting pipe 20 is not attached.

  Further, in both FIG. 2A and FIG. 2B, dip and peak due to interference between the direct sound from the sound source and the reflected sound from the member simulating the blocking portion 12 appear in the frequency characteristics under the implementation conditions. Yes. However, comparing FIG. 2A and FIG. 2B, the frequency characteristics under the implementation conditions in FIG. 2B have smaller dip and peak sizes. Therefore, the sound silencing performance is higher when the position at a distance of 1 m from the sound source shown in FIG. Therefore, in order to improve the silencing performance in front of the trumpet, the direction in which the performance adjusting pipe 20 extends from the closing portion 12 is not parallel to the axis of the cylindrical portion 11 as shown in FIG. It is good also as a structure inclined with respect to 11 axis | shafts.

  Furthermore, in this embodiment, the performance adjustment pipe 20 is attached to the closing portion 12 so that the distance L between the first end portion 20a and the inner wall of the closing portion 12 is smaller than 4.25 mm. That is, since the closed portion 12 serves as a sound wave reflecting surface, in a sound wave in which twice the distance L between the first end portion 20a and the inner wall of the closed portion 12 is equal to an odd multiple of a half wavelength or an integral multiple of a wavelength. Is attenuated or resonated between the traveling wave and the reflected wave to the closed portion 12. Therefore, dips and peaks appear as compared with the sound waves of other wavelengths. The condition that the distance L is the shortest among the conditions in which attenuation or resonance occurs between the traveling wave and the reflected wave to the blocking portion 12 is 2 × L = wavelength / 2, and therefore the equation of frequency = sound speed / wavelength is used. When the distance L is converted into the frequency f, f = v / (4L) (v is the speed of sound). Therefore, when the sound speed is 340 m / s, the frequency corresponding to the distance L = 4.25 mm is 20000 Hz (= 340 / (4 × (4.25 / 1000))). Therefore, the distance L = 4.25 mm is a length at which attenuation or resonance occurs at the upper limit frequency of the audible range. In this embodiment, the distance L between the first end portion 20a and the inner wall of the closing portion 12 is as follows. By making it smaller than 4.25 mm, it is configured so that no dip or peak occurs in the audible sound wave.

(2) Performance adjustment pipe length:
When performing with the silencer attached to the trumpet, the performer outputs a sound by vibrating the gas present between the mouthpiece and the silencer. In the silencer provided with the performance adjusting pipe 20, As the length of the performance adjusting pipe 20 is longer, the degree of freedom in generating gas vibration can be easily suppressed. Therefore, the longer the length of the performance adjusting pipe 20 is, the easier it is to stabilize the sound wave generated in the silencer. And in this embodiment, since the performance adjustment pipe 20 is extended from the obstruction | occlusion part 12 toward the outer side (front) of the main body 10 of a silencer, the structural restrictions which regulate the length of the performance adjustment pipe 20 are not exist. Therefore, the length of the performance adjusting pipe 20 can be easily increased as much as possible, and the pitch is stabilized with the stabilization of the sound wave. Therefore, a high performance silencer can be provided.

  As described above, it is preferable that the performance adjustment pipe is as long as possible in order to suppress changes in pitch and stabilize sound waves, but in this embodiment, the upper limit of the length of the performance adjustment pipe is also defined from another viewpoint. Yes. That is, in the present embodiment, the length of the performance adjusting pipe 20 is configured to be shorter than the half wavelength of the highest sound within the trumpet practical sound range. As a result, it is configured not to resonate with the practical sound of the trumpet.

  That is, when 1/2 of the wavelength of the sound wave is equal to the length of the performance adjusting pipe 20, the energy given to the gas by the performer during the performance of the trumpet is consumed by resonance in the performance adjusting pipe 20, and the original performance is performed. It is thought that energy for outputting sound is lost. For example, assuming that the highest sound in the practical sound range of the trumpet is about 920 Hz and the sound speed is 340 m / s, ½ of the wavelength of the highest sound in the practical sound range is about 185 mm (185≈ (340/920/2) × 1000). Therefore, if the length of the performance adjusting pipe 20 is shorter than 185 mm (for example, 90 mm as shown in FIG. 1), it is possible to provide a silencer that can be played comfortably without causing energy loss. . In FIG. 1, the diameter of the closing portion 12 (length in the direction perpendicular to the axis) is 80 mm, and the inner diameter of the performance adjusting pipe 20 is 6 mm.

(3) Other embodiments:
In the present invention, it is only necessary to attach a performance adjusting pipe extending outward from the main body of the silencer, and various other configurations can be employed. For example, the shape and extending direction of the performance adjustment pipe and the attachment position with respect to the main body 10 are not limited to the configuration shown in FIG. 1, and the performance adjustment pipe 20 may be detachable from the closing portion 12.

FIG. 3 shows that the performance adjustment pipe 200 attached to the silencer body 10 is bent on the outside of the body 10 so that the player side space (rear space) from the end surface 1a of the trumpet bell 1 is shown. It is sectional drawing which shows embodiment which the 2nd edge part 200b opens. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. In the present embodiment, the performance adjustment pipe 200 includes a linear part P 1 and a bent part P 2, and the central axis of the bent part P 2 is semicircular.

Further, the end portion of the bent portion P 2 becomes the first end portion 200 a and is inserted into the boss 12 a formed at the center of the closing portion 12, and the first end portion 200 a opens inside the main body 10. . On the other hand, the end portion of the linear portion P 1 constituting the performance adjusting pipe 200 becomes the second end portion 200 b and opens outside the main body 10. According to this configuration, since the main sound is output in the backward direction, the sound waves traveling in front of the performer can be relatively reduced, and the silencing performance in front of the performer can be improved. In this configuration, an attachment 210 having an opening diameter at one end larger than the opening diameter at the other end is attached to the opening of the second end 200b, and output from the second end 200b. It is good also as a structure which adjusts the directivity of the sound to be performed.

  FIG. 4 is a cross-sectional view showing an embodiment in which a part of the performance adjusting pipe 201 attached to the silencer main body 10 is present inside the main body 10 and the remaining portion is present outside the main body 10. 4, the same components as those in FIG. 1 are denoted by the same reference numerals. Also in this embodiment, the performance adjustment pipe 201 includes a linear portion and a bent portion, and the central axis of the bent portion is a semicircle. Further, the bent portion exists in the main body 10, and most of the linear portions exist outside the main body 10. According to this configuration, it is possible to suppress the length of the performance adjustment pipe 201 protruding outside the main body 10 while increasing the length of the performance adjustment pipe 201.

  Furthermore, a configuration may be added in which sound is collected by a microphone while being silenced by a silencer, and a specific person (such as a player) can hear the collected sound. FIG. 5 is a diagram illustrating an example of a configuration in which a microphone can be attached to the silencer. In FIG. 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals. In the configuration example shown in FIG. 5, a microphone 320 a is attached to the end 31 b of the pitch adjusting member 31. Further, a terminal 120a is attached to the closing portion 12, and a signal line 320b is connected to the microphone 320a and the terminal 120a. If the output signal line to the amplifier or the like is connected to the terminal 120a with the silencer 10 according to this configuration attached to the bell of the brass instrument, the performance sound is desired by the amplifier or the like while the output sound from the brass instrument is muted. It can be converted into a sound of the size of and can be heard by a specific person. Note that the position of the microphone 320a is not limited to the end of the rod-shaped member 32, and may be anywhere as long as the performance sound can be detected in the silencer. The means for sending the output signal of the microphone 320a to an amplifier or the like is not limited to wired communication, and may be wireless communication.

DESCRIPTION OF SYMBOLS 1 ... Bell, 1a ... End face, 10 ... Main body, 11 ... Cylindrical part, 11a ... Buffer material, 12 ... Blocking part, 12a ... Boss, 13 ... End part, 14 ... End part, 20 ... Performance adjustment pipe, 20a ... End part, 20b ... End part, 31 ... Pitch adjustment member, 31a ... End part, 31b ... End part, 31c ... Connecting member

Claims (4)

  1. A main body including a cylindrical portion attached so that an outer peripheral surface thereof is in contact with an inner peripheral surface of a bell of a brass instrument and a closing portion that closes one end of the cylindrical portion;
    A performance adjusting pipe that extends from the closed portion to the outside of the main body, has a first end opened in the vicinity of the closed portion inside the main body, and has a second end opened outside the main body,
    Equipped with a,
    The performance adjustment pipe is shorter than the half wavelength of the highest sound in the practical sound range of the brass instrument,
    Silencer.
  2. The performance adjusting pipe has a length different from a half wavelength of each practical sound of the brass instrument,
    The silencer according to claim 1.
  3.   Since the performance adjusting pipe is bent outside the main body, the second end portion is opened in a space closer to the performer than the end surface of the bell.
      The muffler according to claim 1.
  4.   The body includes a terminal,
      A signal line extending from the microphone is connected to the terminal.
      The silencer according to any one of claims 1 to 3.
JP2015129492A 2015-06-29 2015-06-29 silencer Pending JP2015200909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015129492A JP2015200909A (en) 2015-06-29 2015-06-29 silencer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015129492A JP2015200909A (en) 2015-06-29 2015-06-29 silencer

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2013025093 Division 2013-02-13

Publications (1)

Publication Number Publication Date
JP2015200909A true JP2015200909A (en) 2015-11-12

Family

ID=54552148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015129492A Pending JP2015200909A (en) 2015-06-29 2015-06-29 silencer

Country Status (1)

Country Link
JP (1) JP2015200909A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US51363A (en) * 1865-12-05 John f
US1468066A (en) * 1921-10-27 1923-09-18 Universal Telescope Mute Compa Telescopic mute
JPS5299314U (en) * 1976-01-26 1977-07-27
JPH08194473A (en) * 1994-11-14 1996-07-30 Yamaha Corp Mute for brass
JPH09501243A (en) * 1993-07-12 1997-02-04 タラント,ジェイムズ,ケヴィン Sound absorber practicing silencer
JPH11234957A (en) * 1998-02-17 1999-08-27 Toshiba Corp Noise suppressor for dynamo-electric machine
JP2008096498A (en) * 2006-10-06 2008-04-24 Best Brass Corp Silencer for brass instruments

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US51363A (en) * 1865-12-05 John f
US1468066A (en) * 1921-10-27 1923-09-18 Universal Telescope Mute Compa Telescopic mute
JPS5299314U (en) * 1976-01-26 1977-07-27
JPH09501243A (en) * 1993-07-12 1997-02-04 タラント,ジェイムズ,ケヴィン Sound absorber practicing silencer
JPH08194473A (en) * 1994-11-14 1996-07-30 Yamaha Corp Mute for brass
JPH11234957A (en) * 1998-02-17 1999-08-27 Toshiba Corp Noise suppressor for dynamo-electric machine
JP2008096498A (en) * 2006-10-06 2008-04-24 Best Brass Corp Silencer for brass instruments

Similar Documents

Publication Publication Date Title
CN105228039B (en) Quality with draft chamber loads earplug
TWI530199B (en) An earphone having an acoustic tuning mechanism
US10237641B2 (en) Sound output device and sound guiding device
US7621370B2 (en) Sound increase apparatus
US7681577B2 (en) Ear tip
US5828759A (en) System and method for reducing engine noise
DE102004007717B4 (en) Helmholtz resonator
US3978941A (en) Speaker enclosure
EP0984662B1 (en) Waveguide electroacoustical transducing
US4893695A (en) Speaker system
JP2012513035A (en) Audio noise canceling
US9036851B2 (en) Methods and apparatuses for sound production
US8331577B2 (en) Electronic device having active noise control with an external sensor
EP3046336A1 (en) Earphone device having sound guiding structures
US7992674B2 (en) Dipole flow driven resonators for fan noise mitigation
JP2006348932A (en) Acoustics liner with nonuniform impedance
US20070044747A1 (en) Air intake sound control structure
US4177874A (en) Active acoustic sound absorber device
JP5528715B2 (en) In-ear earphone
JP5920418B2 (en) Acoustic structure
EP1223572B1 (en) Active noise control system
EP3311588B1 (en) Noise cancellation system, headset and electronic device
CN107431856B (en) Directional acoustic device
US7556123B2 (en) Muffler duct
TW200828264A (en) Noise canceling device and method thereof

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20160328

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160405

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160509

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20160906