JP2015031848A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffler which can be used for both of a user using a microphone and the user who does not use the microphone and further to provide a muffler capable of collecting a sound of a tone quality according to use or preference of the user by the microphone.SOLUTION: A muffler 1 has a main body 10 configured of a trunk part 11, a bottom part 12, and an insertion port 33 that forms a microphone insertion hole 33a. A bar-like member 21 fixed with a microphone 22 is inserted to the microphone insertion hole 33a formed by the insertion port 33 of the main body part 10. The inserted bar-like member 21 is stored inside a hollow pipe 31 fixed to an inner side of the main body part 10. The bar-like member 21 is slidable in an axial direction of the pipe 31 inside the pipe 31.

Description

  The present invention relates to a silencer.

  Some silencers used for the purpose of reducing the volume of wind instruments such as trumpet are provided with a microphone in the silencer. The microphone in the silencer is provided in the vicinity of the opening end of the silencer main body, which is a position where a well-balanced sound can be collected over the entire sound range (for example, Patent Document 1). The user can listen to the sound collected by the microphone via headphones.

Japanese Patent No. 4124236

  However, since the sound picked up by the microphone is not completely the same as the sound played without the muffler, some users do not use the mounted microphone even if the muffler is installed. In addition, in a silencer equipped with a microphone, the weight of the silencer increases by the amount of the electrical components for operating the microphone and the microphone. Therefore, it is better for a user who does not use a microphone to be equipped with no microphone or electrical component that increases the weight of the silencer.

  In addition, the microphone is provided at a position near the opening end. When the sound quality of the sound collected by the microphone provided at this position is examined in detail, the following characteristics are obtained. First, under the influence of Helmholtz resonance using air near the opening end as a mass and air inside the silencer as a spring, a large dip is likely to occur in the middle range in the frequency characteristics. Also, there is a path difference between the direct sound that reaches the microphone directly from within the bell and the indirect sound that enters the silencer from within the bell and reflects off the inner wall of the bottom that closes the front end of the silencer and reaches the microphone. Occurs. The direct sound and the indirect sound interfere with each other due to the path difference between the direct sound and the indirect sound, and a peak or a dip is likely to occur in the mid-high range in the frequency characteristics. Therefore, although the sound pressure level is well balanced over the entire sound range, a sound with a sound quality with a sound is collected. Such wrinkled sound quality is not necessarily optimal depending on the use and preference of each user. For example, an output signal having a habit of sound quality is not preferable for a user who wants to apply an effect to a microphone output signal and to enjoy the effect.

  The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a silencer that can be used for both a user who uses a microphone and a user who does not use a microphone. The second object of the present invention is to provide a silencer that can pick up sound of a sound quality according to the use and preference of each user using a microphone.

  The present invention has a main body portion fixed to a bell of a wind instrument, and a microphone that collects sound generated in the bell, and the main body portion includes a microphone attaching / detaching means for attaching / detaching the microphone. A silencer is provided.

  According to this invention, the user who uses the microphone can attach the microphone to the main body by the microphone attaching / detaching means and fix the main body to the bell of the wind instrument. On the other hand, the user who does not use the microphone can remove the microphone from the main body by the microphone attaching / detaching means and fix the main body to the bell of the wind instrument. For this reason, it can be used for both a user who uses a microphone and a user who does not use a microphone.

  In a preferred embodiment, the microphone further includes a rod-like member to which the microphone is fixed, and the microphone attaching / detaching means is a hole opened in a closing portion that closes a front end of the main body portion, and is used for inserting the rod-like member. Provided is a silencer having a microphone insertion hole. According to this aspect, the rod-like member to which the microphone is fixed is inserted into the microphone insertion hole opened at the closing portion that closes the front end of the main body portion. Further, the rod-shaped member is pulled out from the microphone insertion hole. That is, the microphone can be attached to and detached from the main body by inserting / removing the rod-like member into / from the microphone insertion hole. Therefore, it can be used for both a user who uses a microphone and a user who does not use a microphone. Moreover, according to this aspect, the degree of insertion when the rod-shaped member is inserted into the microphone insertion hole can be adjusted. That is, the microphone can be moved to each position in the silencer. For this reason, it is possible to pick up and collect a sound having an appropriate sound quality from among sounds having different sound quality depending on each position in the silencer. Therefore, it is possible to collect sound of sound quality according to the use and preference for each user.

  In a further preferred aspect, the silencer is characterized in that a hollow pipe that accommodates the rod-like member inserted through the microphone insertion hole is fixed inside the main body. According to this aspect, the rod-shaped member inserted from the microphone insertion hole is accommodated in the pipe fixed inside the main body. And the rod-shaped member moves in the axial direction of the pipe by adjusting the insertion degree of the rod-shaped member. That is, the microphone can be moved to each position in the axial direction of the pipe. For this reason, it is possible to pick up and collect a sound having an appropriate sound quality from sounds having different sound quality depending on each position in the axial direction of the pipe. Therefore, it is possible to collect sound of sound quality according to the use and preference for each user. Moreover, according to this aspect, the rod-shaped member accommodated in the pipe is supported by the pipe. For this reason, the attitude | position of the microphone fixed to the rod-shaped member can be maintained easily. Of course, also in this embodiment, the microphone can be attached to and detached from the main body.

It is a longitudinal section showing the composition of silencer 1 by a 1st embodiment of this invention. FIG. 3 is a longitudinal sectional view showing the configuration of the silencer 1 when the microphone 22 in the silencer 1 is disposed in the vicinity of the end surface of the small diameter side end 11b of the trunk portion 11. It is a longitudinal cross-sectional view which shows the structure of the said silencer 1 when the microphone 22 in the silencer 1 is arrange | positioned in the bottom part 12 vicinity. FIG. 2 is a longitudinal sectional view showing the configuration of the silencer 1 when the microphone 22 in the silencer 1 is removed from the main body 10. It is a figure which shows each frequency characteristic by simulation when moving the microphone 22 to each position of the pitch adjustment part 34 side end of the pipe 31, the small diameter side end 11b vicinity of the trunk | drum 11, and the bottom part 12. FIG. It is a figure which shows each frequency characteristic by measurement when the microphone 22 is moved to each position of the pitch adjustment part 34 side end of the pipe 31, the small diameter side end 11b vicinity of the trunk | drum 11, and the bottom part 12. FIG. It is a longitudinal cross-sectional view which shows the structure of the silencer 1A by 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the silencer 1B by the modification (2) of this invention. It is a longitudinal cross-sectional view which shows the structure of the silencer 1C by the modification (3) of this invention. It is a longitudinal cross-sectional view which shows the structure of the silencer 1D by the modification (4) of this invention. The longitudinal cross-sectional view which shows the structure of the silencer 1E by the modification (9) of this invention, and the see-through | perspective back view which shows the structure of the silencer 1E when seeing through a part from the rear end side of the silencer 1E It is.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a longitudinal sectional view showing the structure of a silencer 1 according to the first embodiment of the present invention. The silencer 1 according to this embodiment is a silencer for trumpet. FIG. 1 shows a state in which the silencer 1 is mounted on a trumpet. As shown in FIG. 1, the silencer 1 has a main body portion 10 including a body portion 11, a bottom portion 12, and an insertion port 33 that forms a microphone insertion hole 33 a. In the silencer 1, the rod-like member 21 to which the microphone 22 is fixed is inserted into the microphone insertion hole 33 a formed by the insertion port 33 of the main body 10. And the rod-shaped member 21 inserted through the microphone insertion hole 33a is accommodated in the hollow pipe 31 fixed to the inner side of the main body 10. Thus, the microphone 22 can be attached to the main body 10 by inserting the rod-like member 21 to which the microphone 22 is fixed into the microphone insertion hole 33a. Further, the microphone 22 can be removed from the main body 10 by pulling out the rod-like member 21 to which the microphone 22 is fixed from the microphone insertion hole 33a. That is, the silencer 1 is configured such that the microphone 22 can be attached to and detached from the main body 10. The microphone insertion hole 33 a formed by the insertion port 33 functions as a microphone attaching / detaching means for attaching / detaching the microphone 22 to / from the main body 10. Further, the silencer 1 can slide the rod-like member 21 to which the microphone 22 is fixed in the pipe 31 in the axial direction of the pipe 31. That is, the silencer 1 is configured such that the position of the microphone 22 is movable in the main body 10. Further, the rod-like member 21 to which the microphone 22 is fixed may be an internal component of the silencer 1 or an external component. That is, the rod-shaped member 21 to which the microphone 22 is fixed may be circulated together with the main body 10, or the rod-shaped member 21 may be circulated separately from the main body 10.
Hereinafter, the configuration of the silencer 1 will be described in detail.

  The trunk portion 11 is a hollow tube having a substantially conical tube shape having a cavity 13 inside the trunk portion 11. The body 11 has an outer diameter and an inner diameter that are reduced along the inner wall of the bell 3 of the trumpet from the large-diameter end 11a that is the front end toward the small-diameter end 11b that is the rear end. Here, the bell 3 in the wind instrument (trumpet) refers to a portion in the vicinity of the exhalation port where the diameter of the tube of the wind instrument is gradually widened in order to increase the volume. The small diameter side end 11b which is the rear end is open. A mounting portion 14 made of a flexible material is provided around the axis of the trunk portion 11 on the outer surface of the trunk portion 11 in the vicinity of the small-diameter end 11b. The silencer 1 is inserted into the bell 3 of the trumpet from the small-diameter side end that is the rear end. And the trunk | drum 11 of the small diameter side end 11b vicinity is fixed to the inner wall of the bell 3 of a trumpet via the attachment part 14. FIG.

  The bottom 12 is dish-shaped, and the bottom portion of the dish is located near the axis of the silencer 1. Further, the edge portion of the bottom portion 12 is joined to the large-diameter side end 11a of the body portion 11 by an adhesive or the like. The bottom portion 12 functions as a closed portion that closes the large-diameter side end 11a that is the front end of the body portion 11, and the large-diameter side end 11a is a closed end. The bottom 12 is positioned near the end face of the bell 3 when the body 11 is fixed to the inner wall of the bell 3 of the trumpet. More specifically, the vicinity of the joint between the bottom 12 and the body 11 is located on the end surface of the bell 3, and the bottom 12 is more outward (front side) than the end surface of the bell 3 because the bottom 12 is curved. Protruding.

  The other end of the U-shaped pipe 16 having one end opened near the inner wall of the bottom portion 12 is fixed to the inner wall of the bottom portion 12. A through hole 15 is provided in a portion of the bottom 12 where the U-shaped pipe 16 is fixed. The inner diameter of the U-shaped pipe 16 and the diameter of the through-hole 15 are equal to or larger than the minimum inner diameter of the trumpet mouthpiece. The exhaled air that is blown from the mouthpiece of the trumpet, passes through the trumpet, and is introduced into the cavity 13 in the silencer 1 from the small-diameter side end 11b of the silencer 1 passes through the U-shaped pipe 16 and passes through the through hole 15. To the space outside the silencer 1.

  In the center of the bottom portion 12, a substantially cylindrical insertion port 33 penetrating the bottom portion 12 is provided. The insertion port 33 forms a microphone insertion hole 33a that allows communication between the inner space and the outer space of the silencer 1. That is, the microphone insertion hole 33 a is a hole opened in the bottom portion 12 that is a closing portion that closes the front end of the main body portion 10, and is a hole for inserting the rod-shaped member 21. The microphone insertion port 33 serves as an inlet for guiding the rod-like member 21 to which the microphone 22 is fixed from the silencer 1 into the silencer 1, and reduces the gap between the bottom portion 12 and the rod-like member 21. It plays the role which keeps airtight in the vessel 1.

  The pipe 31 is a hollow tube having a cylindrical shape. The pipe 31 is accommodated inside the trunk portion 11 and is disposed along the axis of the trunk portion 11. The length of the pipe 31 in the axial direction is longer than the length of the trunk portion 11 in the axial direction. One end of the pipe 31 is fixed to the inner end of the insertion port 33 (that is, the inner side of the main body portion 10). The end of the pipe 31 on the side of the insertion port 33 is open, and the space inside the pipe 31 and the space outside the silencer 1 communicate with each other through the insertion port 33. The inner diameter of the pipe 31 is substantially the same as the inner diameter of the insertion port 33. A pitch adjuster 34 is fixed to the other end of the pipe 31. A claw portion 32 extending in a direction toward the axis of the pipe 31 is provided at an end portion of the pipe 31 on the pitch adjusting portion 34 side. On the inner side of the claw portion 32 at the end of the pipe 31 on the pitch adjustment portion 34 side, there is an opening for communicating the space inside the pipe 31 with the space in the bell 3 when the silencer 1 is mounted on the bell 3. It is formed. An opening 35 is provided on the side surface of the pipe 31 to connect the space inside the pipe 31 and the space outside. Sound waves enter the space inside the pipe 31 from the space outside the pipe 31 through the opening 35. For example, the opening 35 is provided with a plurality of holes along the axis of the pipe 31 along the axis of the pipe 31, but may be any as long as the sound wave is sufficiently incident on the pipe 31. However, the present invention is not limited to this mode.

  The pitch adjusting unit 34 is a hollow tube having a substantially conical tube shape. The pitch adjusting section 34 accommodates the pipe 31 on the inner side, and is disposed on the rear end side of the bell 3 with respect to the body section 11 of the main body section 10. The pitch adjuster 34 has an outer diameter and an inner diameter that are reduced along the inner wall of the bell 3 from the large-diameter side end 34a that is the front end toward the small-diameter side end 34b that is the rear end. The large-diameter side end 34 a is open, and the small-diameter side end 34 b is fixed and closed to the end of the pipe 31 opposite to the end fixed to the inside of the main body 10. Therefore, the pitch adjusting section 34 has an outer peripheral surface that protrudes toward the inner wall of the bell 3 in a state where the main body 10 is fixed to the bell 3. The pitch adjusting unit 34 is provided to prevent the pitch when the silencer 1 is worn and played from being deviated from the pitch when played without the silencer 1 being attached. In addition, there is a gap between the large-diameter side end 34 a of the pitch adjusting portion 34 and the small-diameter side end 11 b of the body portion 11. This gap functions as an entrance to the silencer 1 that guides the breath and sound in the bell 3 into the silencer 1.

  The microphone unit 20 includes a rod-shaped member 21, a microphone 22, a microphone capsule 23, a signal line 24, and a packing 25. The rod-like member 21 is an elongated round rod-like member having an outer diameter slightly smaller than the inner diameter of the pipe 31 and the inner diameter of the insertion port 33. The length of the rod-shaped member 21 in the axial direction is longer than the length of the pipe 31 in the axial direction. A microphone capsule 23 is fixed to the tip of the rod-shaped member 21. The microphone capsule 23 is a cylindrical container having an outer diameter equal to or smaller than the outer diameter of the rod-shaped member 21. A microphone 22 is stored in the microphone capsule 23. That is, the microphone 22 is fixed to the rod-shaped member 21. The microphone 22 is, for example, an omnidirectional microphone. At least a part of the front surface of the microphone capsule 23 is opened so that the microphone 22 can easily collect sound. The signal line 24 connected to the microphone 22 passes through the inside of the rod-shaped member 21 and continues from the base of the rod-shaped member 21 to the outside of the rod-shaped member 21 via the packing 25. This signal line 24 is connected to an external device such as a headphone amplifier.

  The rod-shaped member 21 is inserted into the microphone insertion hole 33 a of the insertion port 33 from the microphone capsule 23 side and is accommodated in the pipe 31. FIG. 1 shows a state where the microphone capsule 23 is inserted until it comes into contact with the claw portion 32. As shown in FIG. 1, when the microphone capsule 23 comes into contact with the claw portion 32, the opening portion at the end portion of the pipe 31 on the pitch adjusting portion 34 side is a microphone 22 (more accurately fixed to the tip end of the rod-shaped member 21. Is closed by the microphone capsule 23). When the opening at the end of the pipe 31 on the pitch adjustment section 34 side is closed, the pitch adjustment section 34 functions appropriately. The rod-shaped member 21 is pulled out from the pipe 31 by pulling the rod-shaped member 21 accommodated in the pipe 31 in the root side direction (front of the bell 3).

The rod-shaped member 21 can slide in the axial direction of the pipe 31 in the pipe 31 while ensuring the airtightness of the space in the silencer 1 at the insertion port 33. That is, the pipe 31 supports the rod-shaped member 21 to maintain the posture of the rod-shaped member 21 and plays a role of guiding the movement of the rod-shaped member 21. For this reason, it is possible to continuously move the microphone 22 fixed to the tip of the rod-shaped member 21 to each position in the axial direction of the pipe 31 while ensuring the silencing function of the silencer 1. That is, the microphone 22 is continuously provided in the silencer 1 from the corner to the corner in the axial direction of the silencer 1 (specifically, from the insertion port 33 to the small-diameter side end 34b of the pitch adjusting unit 34). Can be moved to. And the sound of the sound quality in the position which moved the microphone 22 can be picked up.
The above is the configuration of the silencer 1.

  Next, the operation of the silencer 1 according to the present embodiment will be described. As shown in FIG. 1, when the rod-shaped member 21 is inserted into the pipe 31 until the microphone capsule 23 contacts the claw portion 32 of the pipe 31, the microphone 22 is disposed at the small diameter side end 34 b of the pitch adjusting unit 34. . In this case, the microphone 22 mainly has a sound that reaches the microphone 22 from the inside of the bell 3 through the opening at the end of the pipe 31 on the pitch adjusting portion 34 side and the opening at the front of the microphone capsule 23 (that is, the bell 3). (Direct sound from inside). Further, the microphone 22 enters the silencer 1 from the bell 3 through a gap between the small diameter side end 11 b of the body portion 11 and the large diameter side end 34 a of the pitch adjusting portion 34, and enters the muffler 1 on the small diameter side of the body portion 11. The silencer enters the space 13 in the body portion 11 from the end 11b, reflects on the inner wall of the bottom portion 12, and passes through a gap between the small diameter side end 11b of the body portion 11 and the large diameter side end 34a of the pitch adjusting portion 34. The sound that enters the bell 3 from the inside of the bell 1 and reaches the microphone 22 from the inside of the bell 3 through the opening at the end of the pipe 31 on the pitch adjusting portion 34 side and the opening at the front of the microphone capsule 23 (that is, the bottom 12). Indirect sound reflected by the inner wall is also collected. Since the position of the microphone 22 is away from the bottom portion 12, a path difference occurs between the direct sound from the bell 3 and the indirect sound reflected by the inner wall of the bottom portion 12, and the direct sound and the indirect sound interfere with each other. .

  Further, air near the entrance of the silencer 1 (near the gap between the small diameter side end 11b of the body portion 11 and the large diameter side end 34a of the pitch adjusting portion 34) is used as a mass, and the air inside the silencer 1 is used as a spring. Helmholtz resonance occurs.

  2 to 4 are longitudinal sectional views showing the configuration of the silencer 1 when the position of the microphone 22 is changed by sliding the rod-shaped member 21. 2 shows a state in which the microphone 22 is arranged in the vicinity of the end face of the small diameter side end 11b of the trunk portion 11, FIG. 3 shows a state in which the microphone 22 is arranged in the vicinity of the bottom portion 12, and FIG. A state in which the microphone 22 is pulled out from the pipe 31 and removed from the main body 10 is shown.

  As shown in FIG. 2, when the microphone 22 is disposed in the vicinity of the end face of the small diameter side end 11 b of the body portion 11, a cap 36 that closes the opening portion at the end portion of the pipe 31 on the pitch adjusting portion 34 side is provided. After mounting, the silencer 1 is attached to the trumpet. This is to prevent exhalation from being introduced from the bell 3 into the silencer 1 through the opening at the end of the pipe 31 on the pitch adjusting section 34 side. By attaching this cap 36, the opening performance at the end of the pipe 31 on the pitch adjusting section 34 side is closed by the microphone 22 (when the microphone capsule 23 is brought into contact with the claw section 32), the same as the pitch performance. The pitch performance can be maintained. The cap 36 may be connected to the silencer 1 with a string or the like so as not to lose the cap 36.

  In the case shown in FIG. 2, the microphone 22 enters the silencer 1 from the bell 3 through the gap between the small diameter side end 11 b of the body portion 11 and the large diameter side end 34 a of the pitch adjustment portion 34. 11 enters the pipe 31 through the opening 35 of the pipe 31 in the vicinity of the small-diameter side end 11b and reaches the microphone 22 through the opening in the front of the microphone capsule 23 (that is, direct sound from the bell 3). To pick up the sound. Further, the microphone 22 enters the silencer 1 from the bell 3 through a gap between the small diameter side end 11 b of the body portion 11 and the large diameter side end 34 a of the pitch adjusting portion 34, and enters the muffler 1 on the small diameter side of the body portion 11. It enters the space 13 in the body part 11 from the end 11 b, is reflected by the inner wall of the bottom part 12, enters the pipe 31 through the opening of the pipe 31 in the vicinity of the small-diameter side end 11 b of the body part 11, and the front of the microphone capsule 23. Sound that reaches the microphone 22 through the opening (that is, indirect sound reflected by the inner wall of the bottom 12) is also collected. And these direct sound and indirect sound interfere. In addition, Helmholtz resonance occurs as in the case of FIG.

  As shown in FIG. 3, when the microphone 22 is arranged near the bottom portion 12, a cap 36 that closes the opening portion is attached to the opening portion at the end of the pipe 31 on the pitch adjustment portion 34 side as in FIG. 2. In the case shown in FIG. 3, the microphone 22 mainly enters the silencer 1 from the inside of the bell 3 through a gap between the small diameter side end 11 b of the trunk portion 11 and the large diameter side end 34 a of the pitch adjusting portion 34. The small diameter side end 11b of the body 11 enters the space 13 in the body 11, enters the pipe 31 through the opening 35 of the pipe 31 near the bottom 12, and passes through the opening in the front of the microphone capsule 23. Sounds that reach the microphone 22 (that is, direct sounds from the bell 3) are collected. In this case, since the position of the microphone 22 is in the vicinity of the bottom portion 12, there is little path difference between the direct sound from the bell 3 and the indirect sound reflected by the inner wall of the bottom portion 12, and interference between the direct sound and the indirect sound is small. The impact is reduced.

  As shown in FIG. 4, when the microphone 22 is removed from the main body 10, a cap 36 that closes the opening is attached to the opening at the end of the pipe 31 on the pitch adjustment unit 34 side. At the same time, a cap 37 that closes the microphone insertion hole 33 a is attached to the outer end of the insertion port 33. This prevents exhalation from being introduced into the silencer 1 from the bell 3 through the opening at the end of the pipe 31 on the pitch adjustment section 34 side, and also in the silencer 1 through the microphone insertion hole 33a. This is to prevent exhalation from being discharged outside the silencer 1. Thereby, the same pitch performance as when the microphone 22 is attached to the main body 10 (when the rod-like member 21 is inserted into the microphone insertion hole 33a) can be maintained. Therefore, by pulling out the rod-shaped member 21 from the microphone insertion hole 33 a and attaching the caps 36 and 37, the silencer 1 can function as the silencer 1 without the microphone 22. The cap 37 may be connected to the silencer 1 with a string or the like so that the cap 37 is not lost, like the cap 36.

  FIG. 5 is a diagram illustrating frequency characteristics obtained by simulation when the microphone 22 is moved to positions near the pitch adjusting portion 34 side end of the pipe 31, near the small-diameter side end 11 b of the trunk portion 11, and near the bottom portion 12. . FIG. 6 is a diagram showing frequency characteristics obtained by actual measurement when the microphone 22 is moved to positions near the pitch adjusting portion 34 side of the pipe 31, near the small diameter side end 11 b of the trunk portion 11, and near the bottom portion 12. It is. F10 and F11 indicate when the microphone 22 is disposed at the end of the pitch adjusting unit 34, F20 and F21 indicate when the microphone 22 is disposed near the small-diameter end 11b of the body 11, and F30 and F31 indicate that the microphone 22 is disposed. The case where it arrange | positions in bottom 12 vicinity is shown.

  When the microphone 22 is arranged at the end of the pitch adjusting unit 34 (F10 and F11), a dip due to Helmholtz resonance occurs in the low range near 200 Hz. In addition, a dip due to interference between the direct sound and the indirect sound occurs in a high range near 3000 Hz. In addition, the sound pressure level does not decrease in the high range near 2000 Hz. Therefore, when the microphone 22 is disposed at the end of the pitch adjustment unit 34, a sound with a habit of sound quality that is unlikely to be a muffled sound can be obtained.

  When the microphone 22 is disposed in the vicinity of the small-diameter end 11b of the body 11 (F20 and F21), a dip due to Helmholtz resonance occurs in the middle region near 800 Hz. In addition, the sound pressure level in the high range near 2000 Hz is slightly lower than when it is arranged at the end of the pitch adjusting unit 34. In addition, a dip due to interference between the direct sound and the indirect sound occurs in the high range. For this reason, there is a wrinkle different from the sound quality when arranged at the end of the pitch adjusting unit 34, and a sound with a slightly muffled sound quality is obtained.

  When the microphone 22 is arranged in the vicinity of the bottom 12 (F30 and F31), no dip due to Helmholtz resonance occurs from the low range to the midrange, but the sound pressure level in the high range near 2000 Hz is reduced. This is because the entrance of the silencer 1 (the gap between the small-diameter side end 11b of the body portion 11 and the large-diameter side end 34a of the pitch adjusting portion 34) is narrow, and the sound is muted toward the bottom portion 12 where the microphone 22 is disposed. It can be said that the volume in the vessel 1 is increasing. Further, the dip due to the interference between the direct sound and the indirect sound occurs in a high frequency range where there is no practical problem. Therefore, a sound with a sound quality which is small but is full of sound can be obtained.

  Although the case where the microphone 22 is disposed in any one of the pitch adjusting portion 34 side end in the pipe 31, the small diameter side end 11 b vicinity of the trunk portion 11, and the bottom portion 12 is described, the microphone 22 is arranged on the axis of the pipe 31. Since the pipe 31 can continuously move between the end of the pitch adjusting portion 34 and the end of the insertion port 33, each position between the end of the pitch adjusting portion 34 and the end of the insertion port 33. Of course, it is possible to pick up and collect any sound quality of sound quality. At this time, the closer the position of the microphone 22 is to the insertion port 33 side end (in the vicinity of the bottom portion 12), the more likely it is to have a muffled sound, and the closer to the pitch adjustment unit 34 side end, the easier it is to have a wrinkled sound. Further, the cap 36 that closes the opening at the end of the pipe 31 on the pitch adjusting section 34 side is attached at a time other than when the end of the pipe 31 on the pitch adjusting section 34 is closed by the microphone 22 at the tip of the rod-shaped member 21. .

  As described above, the silencer 1 according to the present embodiment has the small-diameter side end 11b as the rear end opened, and has the hollow main body portion 10 inserted into the bell 3 from the small-diameter side end 11b side. A microphone insertion hole 33a for inserting the rod-like member 21 to which the microphone 22 is fixed is opened at the bottom 12 that closes the large-diameter side end 11a that is the front end, and the microphone 10 is inserted into the main body 10 via the microphone insertion hole 33a. A hollow pipe 31 that accommodates the rod-shaped member 21 to be inserted is fixed. The microphone insertion hole 33a functions as a microphone attaching / detaching means for attaching / detaching the microphone 22 to / from the main body unit 10. For this reason, the microphone 22 can be attached to the main body 10 by inserting the rod-shaped member 21 into the microphone insertion hole 33a, and the microphone 22 can be removed from the main body 10 by pulling out the rod-shaped member 21 from the microphone insertion hole 33a. . That is, the microphone 22 can be attached to and detached from the main body unit 10. For this reason, when not using the microphone 22, the weight of the silencer 1 can be lightened by removing the microphone 22, and a user's burden can be reduced. Therefore, it can be used for both a user who uses the microphone 22 and a user who does not use the microphone.

  Further, by sliding the rod-shaped member 21 in the pipe 31, the microphone 22 fixed to the rod-shaped member 21 can be continuously moved to each position in the axial direction of the pipe 31. That is, the microphone 22 can be continuously moved from the vicinity of the bottom 12 in the silencer 1 to the small-diameter side end 34 b of the pitch adjusting unit 34. Thereby, the sound quality sound at each position from the vicinity of the bottom 12 of the silencer 1 to the small diameter side end 34b of the pitch adjusting unit 34 (from the corner to the corner in the axial direction of the silencer 1) depends on the user's use and preference. Sounds with appropriate sound quality can be freely selected and collected. For example, if a sound with a sound quality that can clearly hear mid to high frequencies is more suitable for use and preference than a sound with a sound quality, if the microphone 22 is arranged near the end of the pitch adjustment unit 34, good. Further, when the ear becomes tired due to long-time performance, the microphone 22 is moved from the vicinity of the end of the pitch adjusting section 34 to the vicinity of the bottom 12 so that the sound pressure level in the middle / high range is reduced to reduce the stimulation in the middle / high range. May be used in different ways. In addition, when applying an effect to the output signal of the microphone 22, the microphone 22 may be positioned in the vicinity of the bottom portion 12 when it is desired to obtain a sound with low sound quality even if the effect is applied. . Conversely, when it is desired to obtain a sound with a unique sound quality by applying an effect to the sound quality having a habit, the microphone 22 may be moved to a position closer to the end of the pitch adjusting unit 34.

Second Embodiment
FIG. 7 is a longitudinal sectional view showing the structure of the silencer 1A according to the second embodiment of the present invention. The silencer 1A according to the present embodiment is different from the silencer 1 according to the first embodiment in that a plurality of (three in FIG. 7) microphones 22a, 22b, and 22c are provided on the rod-shaped member 21A.

  As shown in FIG. 7, one microphone capsule 23a to 23c in which the microphones 22a to 22c are stored is one at each of the tip of the rod-shaped member 21A, the vicinity of the center of the rod-shaped member 21A, and the vicinity of the root of the rod-shaped member 21A. It is fixed one by one. At this time, the microphone capsules 23b and 23c are arranged so that the microphones 22b and 22c can easily pick up sound on the rod-like member 21A at a position in front of the microphone capsules 23b and 23c fixed at a position other than the tip of the rod-like member 21A. Openings 27a and 27b are provided to communicate the front surface with the outside of the rod-shaped member 21A. When the rod-like member 21A is inserted into the pipe 31 until the microphone capsule 23a at the tip of the rod-like member 21A comes into contact with the claw portion 32 of the pipe 31, the microphone 22a at the tip of the rod-like member 21A is at the tip of the pitch adjusting portion 34. The microphone 22b in the vicinity of the center of the rod-shaped member 21A is positioned in the vicinity of the end surface of the small-diameter side end 11b of the trunk portion 11, and the microphone 22c in the vicinity of the root of the rod-shaped member 21A is positioned in the vicinity of the bottom portion 12. That is, the microphones 22a to 22c are disposed in the silencer 1A in the axial direction of the silencer 1A (the axial direction of the bell 3). In FIG. 7, the number of the microphones 22 a to 22 c and the microphone capsules 23 a to 23 c in which the microphones 22 a to 22 c are stored is three, but may be two or more than three. May be. Further, the positions of the plurality of microphones 22a to 22c are not limited to the positions shown in FIG.

  In the silencer 1 </ b> A according to the present embodiment, the output signals of the microphones 22 a to 22 c are sent to an external device such as a headphone amplifier via the signal line 24. The user can select one output signal from the output signals of the microphones 22a to 22c by operating the external device. For example, the output signal of the microphone 22a provided at the tip of the rod-shaped member 21A, the output signal of the microphone 22b provided near the center of the rod-shaped member 21A, and the output signal of the microphone 22c provided near the root of the rod-shaped member 21A Only the output signal of the microphone 22b provided near the center of the rod-shaped member 21A is selected from the inside. Thereby, the sound quality sound at each position in the axial direction of the pipe 31 can be freely selected without causing the rod-shaped member 21 </ b> A to largely protrude from the insertion port 33 to the front of the bell 3. Then, the user can listen to the sound of the sound quality indicated by the selected output signal through headphones or the like. Further, one output signal may be selected from the output signals of the plurality of microphones 22a to 22c, and the rod-shaped member 21A may be slid in the pipe 31. Thereby, the sound quality sound at each position in the axial direction of the pipe 31 can be selected more finely.

  The user can also select two or more output signals from the output signals of the plurality of microphones 22a to 22c by operating the external device. In this case, an output signal obtained by mixing two or more selected output signals is obtained. For example, when the output signal of the microphone 22a provided at the tip of the rod-shaped member 21A and the output signal of the microphone 22b provided near the center of the rod-shaped member 21A are selected, the output signal of the microphone 22a and the output signal of the microphone 22b It is possible to obtain an output signal that mixes the two. At this time, the mix ratio of the output signals of the microphones 22a to 22c may be changed. Thereby, the variation in sound quality can be increased without causing the rod-shaped member 21A to largely protrude from the insertion port 33 to the front of the bell. Further, the output signals of the microphones 22a to 22c may be mixed and the rod-shaped member 21A may be slid in the pipe 31. Thereby, the variation of sound quality can further be increased. When mixing the output signals of the microphones 22a to 22c, mixing output signals having a phase difference may result in unintended sound quality due to interference. Therefore, signal processing such as delay is applied to the output signals of the microphones 22a to 22c. After that, it is better to perform processing such as mixing and assigning output signals of the microphones 22a to 22c for each band.

  Also in this embodiment, the rod-shaped member 21A can be inserted into the microphone insertion hole 33a, and the rod-shaped member 21A can be pulled out from the microphone insertion hole 33a, as in the first embodiment. This is because the microphone insertion hole 33a functions as a microphone attaching / detaching means. Therefore, the present embodiment has the same effect as the first embodiment.

  In addition, although the aspect which performs selection of each output signal of several microphone 22a-22c in an external apparatus was demonstrated, even if the means for selecting each output signal of several microphone 22a-22c is provided in the silencer 1A. good.

<Other embodiments>
Although the first and second embodiments of the present invention have been described above, other embodiments are conceivable for the present invention. For example:

(1) In the above embodiments, the trumpet silencers 1 and 1A have been described as an example, but it is needless to say that a similar silencer can be designed for a silencer used for wind instruments other than the trumpet.

(2) The silencer 1 and 1A according to each of the above-described embodiments is such that the microphone 22 of the silencer 1 and 1A in which the bottom portion 12 is located near the end face of the bell 3 and the pitch adjusting portion 34 is provided is detachable. . However, a silencer whose bottom 12 is not near the end face of the bell 3 or a microphone of a silencer that is not provided with a pitch adjustment unit may be made detachable. FIG. 8 is a longitudinal sectional view showing an example in which the microphone is detachable in the silencer 1B in which the pitch adjusting part is not provided and the bottom part protrudes largely forward from the end face of the bell 3. The silencer 1 </ b> B has a pipe 31 that extends from the insertion port 33 at the center of the bottom 52 to the opening end 51 b of the trunk 51 along the axis of the trunk 51. The rod-shaped member 21 to which the microphone 22 is fixed can be inserted into the microphone insertion hole 33a formed by the insertion port 33, and the rod-shaped member 21 can be pulled out from the microphone insertion hole 33a. Also, by sliding the rod-shaped member 21 in the pipe 31, the microphone 22 can be moved to each position between the end of the pipe 31 in the axial direction and the end of the opening end 51b. Accordingly, the same effects as those of the first embodiment are obtained.

(3) The electrical unit 41 including the power source (battery) 43 and the wireless transmitter 42 may be mounted on the microphone unit 20. FIG. 9 is a longitudinal sectional view showing the configuration of a silencer 1C according to this modification. In the silencer 1 </ b> C, an electrical component 41 including a power supply 43 and a wireless transmitter 42 is provided at the base of the rod-shaped member 21. In this aspect, the signal line between the microphone unit 20 and the headphone amplifier can be omitted when the user carries the apparatus having the wireless receiver and the headphone amplifier. Further, when the microphone 22 is removed from the main body 10, the electrical component 41 can be inevitably removed. Therefore, the convenience for the user is further improved.

(4) The electrical equipment section 41 including the power source (battery) 43 and the wireless transmitter 42 may be mounted on the main body section 10 of the silencer 1 and 1A. FIG. 10 is a longitudinal sectional view showing a configuration of a silencer 1D according to this modification. In the silencer 1 </ b> D, the electrical component 41 including the power supply 43 and the wireless transmitter 42 is fixed to the outer end of the insertion port 33. Further, the signal line 24 from the microphone unit 20 is connected to the electrical component 41. The electrical component 41 may be integrated with the main body 10 or may be detachable from the main body 10. In this aspect, the length of the signal line 24 from the microphone unit 20 can be shortened. Further, since the electrical unit 41 is located closer to the wind instrument than when the electrical unit 41 is provided in the microphone unit 20, the balance when the user holds the wind instrument equipped with the silencer 1 </ b> D from the end surface of the bell 3. Can also be less biased forward. Therefore, the convenience for the user is further improved.

(5) In the silencers 1 and 1A according to the above embodiments, the microphone 22 is moved by sliding the rod-shaped member 21 in the pipe 31. However, the movement of the microphone 22 is not limited to this mode. For example, a thread is applied to each of the side surface of the rod-shaped member 21 and the inner wall of the insertion port 33 or the inner wall of the pipe 31, and the rod-shaped member 21 is rotated in the pipe 31, whereby the rod-shaped member 21 is moved in the axial direction of the pipe 31. You may make it move to.

(6) On the side surface of the rod-shaped member 21 of the microphone unit 20, a display serving as a scale or a mark may be provided. Examples of the display as a mark include changing the color of the side surface of the rod-shaped member 21 according to the type of sound quality obtained by the microphone 22. By providing a scale or a mark display, the position of the microphone 22 moving in the pipe 31 and the type of sound quality obtained can be more easily grasped. In addition, by remembering the positions indicated by the scales and marks, the microphone 22 can be returned to the original position again even if the position of the microphone 22 is changed.

(7) The silencers 1 and 1A according to the above embodiments are provided with the claw portion 32 at the end of the pipe 31 on the side of the pitch adjusting portion 34, and the rod-like member 21 inserted into the pipe 31 has a bell 3 further than the claw portion 32. It was designed not to slide in the rear end direction. However, the claw portion 32 is not provided at the end of the pipe 31 on the pitch adjusting portion 34 side, and the microphone 22 fixed to the tip of the rod-shaped member 21 inserted into the pipe 31 is further bell than the end of the pipe 31 on the pitch adjusting portion 34 side. 3 may be positioned in the rear end direction. If the microphone 22 is positioned further toward the rear end of the bell 3 than the end of the pitch adjustment section 34 of the pipe 31, the dip due to Helmholtz resonance is reduced, and the dip due to interference between the direct sound and the indirect sound is further lowered. The shifted sound quality can be picked up.

(8) The silencer 1 and 1A according to each of the above embodiments has the pipe 31 having the same length as the axial length of the silencer 1 and 1A. However, the length of the pipe 31 may be shorter than the axial length of the silencer, or may be longer than the axial length of the silencer. This is because the pipe 31 only needs to support the rod-shaped members 21 and 21A. For example, when the pipe 31 is provided in a silencer that does not include the pitch adjustment unit 34, a mode in which the length of the pipe 31 is shorter than a length in the axial direction of the silencer, or a mode in which the length is increased is conceivable. When making the length of the pipe 31 shorter than the length of the silencer in the axial direction, it is preferable not to provide the claw portion 32 at the tip of the pipe 31. When the rod-like members 21 and 21A to which the microphones 22 and 22a to 22c are fixed are inserted into the insertion port 33, the microphones 22 and 22a to 22c move beyond the tip of the pipe 31 toward the rear end of the silencer. This is in order not to disturb.

  The pipe 31 may not be provided in the silencer. If the microphone insertion hole 33a for inserting the rod-like members 21 and 21A to which the microphones 22 and 22a to 22c are fixed is provided at least in the closing portion (bottom portion 12) for closing the front end of the silencer, the body portion 10 of the silencer is provided. This is because the microphones 22 and 22a to 22c can be detachable. Further, by adjusting the insertion degree when the rod-like members 21 and 21A are inserted into the microphone insertion holes 33a formed by the insertion openings 33, the microphones 22 and 22a to 22c can be moved to the respective positions in the silencer. This is because it is possible to pick up sound of sound quality according to the use and preference for each user. When the pipe 31 is not provided in the silencer, it is preferable that the length of the insertion port 33 in the axial direction is long enough for the insertion port 33 to support the rod-shaped members 21 and 21A. This is to maintain the posture of the rod-shaped members 21 and 21A and the microphones 22 and 22a to 22c inserted through the insertion port 33 in the silencer.

(9) In the silencers 1 and 1A according to the above-described embodiments, the rod-like members 21 and 21A to which the microphones 22 and 22a to 22c are fixed are used as microphone attaching / detaching means for attaching and detaching the microphones 22 and 22a to 22c to the main body unit 10. A microphone insertion hole 33 a for insertion was provided in the main body 10. However, the microphone attaching / detaching means is not limited to this aspect, and may be various aspects. Further, the microphone attaching / detaching means is not limited to the aspect provided in the main body 10, and may be provided separately from the main body 10. For example, a silencer 1E shown in FIG. 11 is conceivable as a means for realizing the microphone attaching / detaching means with another configuration. FIG. 11A is a longitudinal sectional view showing the configuration of the silencer 1E in this modification, and FIG. 11B is a partially transparent view from the rear end side of the silencer 1E. It is a see-through | perspective back view which shows the structure of the silencer 1E.

  The main body 10E includes a conical tube-shaped body 11E and a bottom 12E that closes the large-diameter side end 11Ea that is the front end of the body 11E. A small-diameter side end 11Eb that is a rear end of the body portion 11E is open. The bottom portion 12 in this embodiment does not have the microphone insertion hole 33a provided in the first and second embodiments.

  The microphone unit 20E includes a microphone capsule 23E and a support member 26E. The microphone capsule 23E is a cylindrical container. The microphone capsule 23E stores a microphone, a wireless transmitter that wirelessly transmits an output signal of the microphone to an external device, and a power source (battery) that operates the wireless transmitter (all not shown).

  In the silencer 1E according to the present embodiment, the support member 26E serves as a microphone attaching / detaching means. The support member 26E has a nested shape in which the small diameter rod 26Eb is inserted into the large diameter pipe 26Ea. An elastic member 26Ec such as a spring is stored in the large-diameter pipe 26Ea of the support member 26E. The large-diameter pipe 26Ea and the small-diameter rod 26Eb are engaged so that the small-diameter rod 26Eb is not separated from the large-diameter pipe 26Ea. In the support member 26E, normally, the small diameter rod 26Eb is pushed out from the large diameter pipe 26Ea by the urging force of the elastic member 26Ec stored in the large diameter pipe 26Ea, and the length of the support member 26E becomes the longest. Yes. The support member 26E can shorten the length of the support member 26E by operating the small-diameter rod 26Eb in the large-diameter pipe 26Ea against the urging force of the elastic member 26Ec. The support member 26E is disposed every 90 degrees in the direction along the axis of the microphone capsule 23E, and the end opposite to the end of the small diameter rod 26Eb in the large diameter pipe 26Ea is on the side surface of the microphone capsule 23E. It is fixed. That is, the microphone is fixed to the support member 26E. A mounting portion 26Ed made of a flexible material such as urethane or rubber is fixed to an end of the small-diameter bar 26Eb opposite to the end on the large-diameter pipe 26Ea side (the tip of the support member 26E). Further, normally, the tip of the support member 26E disposed at a position of 180 degrees in the direction along the axis of the microphone capsule 23E with respect to the support member 26E from the attachment portion 26Ed at the tip of the one support member 26E. The distance to the attachment portion 26Ed is larger than the inner diameter at the large-diameter side end 11Ea of the trunk portion 11E. Further, by shortening the length of the support member 26E against the urging force of the elastic member 26Ec, the distance between the mounting portions 26Ed arranged at the 180 degree position is set at the small diameter side end 11Eb of the trunk portion 11E. It can be made smaller than the inner diameter.

  Next, attachment / detachment of the microphone in the silencer 1E will be described. When a microphone is attached to the silencer 1E, first, the small-diameter bar 26Eb of each support member 26E is operated so as to be accommodated in the large-diameter pipe 26Ea against the urging force of the elastic member 26Ec. Reduce the length of. Next, the microphone unit 20E in which the length of each support portion 26E is shortened is inserted into the trunk portion 11E from the outside of the trunk portion 11E through the small-diameter side end 11Eb of the trunk portion 11E that is open. At this time, the microphone (microphone capsule 23E) is arranged at each position in the axial direction of the trunk portion 11E (specifically, from the vicinity of the bottom portion 12E to the small-diameter side end 11Eb) by adjusting the degree to which the microphone unit 20E is inserted. be able to. Next, the posture of the microphone unit 20E is adjusted so that the axis of each support portion 26E is perpendicular to the axis of the trunk portion 11E in the trunk portion 11E. Next, each support member 26E is operated to release the force applied to the small-diameter bar 26Eb so as to resist the biasing force of the elastic member 26Ec. If it does in this way, the small diameter rod 26Eb in each support member 26E will be urged | biased by the direction pushed out from the large diameter pipe 26Ea by elastic member 26Ec (namely, the direction away from the axis | shaft of the trunk | drum 11E), and will move to that direction. . And the attaching part 26Ed of the front-end | tip of each support member 26E is pressed against the inner wall of the trunk | drum 11E with the urging | biasing force of the elastic member 26Ec. In this way, the support member 26E is fixed to the inner wall of the trunk portion 11E, whereby the microphone is attached to the main body portion 10E.

  On the other hand, when removing the microphone from the main body 10E, an operation reverse to the operation of attaching the microphone may be performed. That is, the length of each support member 26E of the microphone unit 20E fixed to the inner wall of the trunk portion 11E is shortened, and the microphone unit 20E is placed inside the trunk portion 11E via the small diameter side end 11Eb of the trunk portion 11E. It may be taken out from the body 11E to the outside.

  Thus, in the silencer 1E of this modification, the microphone is fixed, and the microphone is biased in the direction away from the axis of the main body 10E (body 11E) so as to contact the inner wall of the main body 10E (body 11E). The supporting member 26E that is in contact is made to function as a microphone attaching / detaching means. In this aspect, the microphone fixed to the support member 26E can be attached to the main body 10E by abutting the support member 26E against the inner wall of the trunk portion 11E in the biased state, and the support member 26E can resist the biasing force. By operating as described above, the microphone fixed to the support member 26E can be detached from the main body 10E. Therefore, also in this aspect, the same effect as that of the first embodiment is obtained. The support member 26E of the silencer 1E has a large-diameter pipe 26Ea and a small-diameter rod 26Eb nested, and the large-diameter pipe 26Ea has an elastic member 26Ec. Not limited to. This is because the support member 26E only needs to be urged in a direction away from the axis of the main body 10E and contact the inner wall of the main body 10E.

(10) The microphones 22 and 22a to 22c of the silencer 1 and 1A according to the above embodiments are omnidirectional microphones. However, each of the microphones 22 and 22a to 22c may be a directional microphone. For example, when a unidirectional microphone is fixed to the tip of the rod-shaped member 21 toward the rear end of the bell 3, the sound pressure of the indirect sound reflected from the inner wall of the bottom 12 with respect to the direct sound from the bell 3. It is considered that the sound can be collected at a reduced level. Therefore, the influence of the interference between the direct sound and the indirect sound is reduced, and sound quality wrinkles when the microphone is arranged at a position away from the inner wall of the bottom portion 12 can be reduced. In this aspect, it is necessary to provide an opening not only on the front surface of the microphone capsule 23 but also on the back surface thereof. For this reason, it is preferable that the microphone capsule 23 is sufficiently waterproofed to withstand use in a high-humidity silencer.

(11) The silencers 1 and 1A according to the above embodiments can be attached to and detached from the main body 10 with the microphones 22 and 22a to 22c, and the microphones 22 and 22a to 22c are moved in the axial direction of the body 11. It was possible. However, the silencer may be configured such that the microphones 22 and 22 a to 22 c can be attached to and detached from the main body 10, but the microphones 22 and 22 a to 22 c are not movable in the axial direction of the trunk portion 11. The microphones 22 and 22a to 22c can be moved in the axial direction of the body portion 11, but the microphones 22 and 22a to 22c may not be detachable from the main body portion 10.

(12) The silencer 1A according to the second embodiment includes a plurality of microphones 22a to 22c on the rod-shaped member 21A. However, a plurality of microphones may be provided on the pipe 31. In this aspect, the microphone cannot be attached to and detached from the main body unit 10, but any one of the plurality of microphones is selected, or the output signals of the plurality of microphones are mixed, thereby the axial direction of the pipe 31. Sound quality sound at each position can be selected. That is, the same effect as when the microphone is moved in the axial direction of the pipe 31 can be obtained.

  1, 1A, 1B, 1C, 1D, 1E ... silencer, 3 ... bell, 10, 10E ... main body, 11, 51, 11E ... trunk, 11a, 34a, 11Ea ... large diameter side end, 11b, 34b, 11Eb: small diameter side end, 12, 52, 12E ... bottom, 13 ... cavity, 14 ... mounting portion, 15 ... through hole, 16 ... U-shaped pipe, 20, 20E ... microphone unit, 21 ... rod-shaped member, 22, 22a, 22b, 22c ... microphone, 23, 23a, 23b, 23c, 23E ... microphone capsule, 24 ... signal line, 25 ... packing, 26E ... support member, 26Ea ... large diameter pipe, 26Eb ... small diameter rod, 26Ec ... elastic member, 26Ed ... Attachment part, 31 ... Pipe, 32 ... Nail part, 33 ... Insertion port, 33a ... Microphone insertion hole, 34 ... Pitch adjustment part, 35, 27a, 27 ... Opening, 36, 37 ... Cap, 41 ... Electrical component, 42 ... Wireless transmitter, 43 ... Power source, 51b ... Open end, F10, F11 ... Frequency characteristics near the end of the pitch adjustment unit, F20, F21 ... Body Frequency characteristics in the vicinity of the end surface of the small-diameter side end, F30, F31... Frequency characteristics in the vicinity of the bottom.

Claims (4)

A main body fixed to the bell of the wind instrument,
A microphone for picking up sound generated in the bell,
The silencer characterized in that the main body portion includes a microphone attaching / detaching means for attaching / detaching the microphone. A rod-like member to which the microphone is fixed;
The microphone attaching / detaching means includes
The silencer according to claim 1, wherein the silencer has a microphone insertion hole into which the rod-shaped member is inserted, the hole being opened in a closing portion that closes the front end of the main body portion.   The silencer according to claim 2, wherein a hollow pipe that accommodates the rod-shaped member inserted through the microphone insertion hole is fixed inside the main body. The silencer according to claim 2 or 3, wherein the rod-shaped member has a plurality of microphones fixed in the axial direction of the rod-shaped member.

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