JP2002041049A - Whistle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a whistle which produces a beat sound with high effect on calling people's attention without giving any uncomfortable feeling. SOLUTION: This whistle has the first and the second resonance parts whose capacity is different to each other, and a capacity changeable means which is common to the both to change the capacity of the resonance parts. The capacity changeable means consists of the first and the second piston part material, a piston rod part material, and a pinching part that is located outer part of the piston rod part material and the whistle. By moving the picking part frontward or backward, the first and the second piston rod part material and the first and the second piston part material can be moved to make a liner change to the capacity of each resonance part, to change the resonance frequency. A fixed beat sound can be attained by keeping the difference of the resonance frequency constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a whistle used for judging in various sports competitions, for guarding, guiding, signaling, etc. in places where many people gather.

[0002]

2. Description of the Related Art In sports competitions, for example, a referee blows a whistle to start or stop a game and gives instructions to the player by sound in order to give various instructions to the player and advance the competition in accordance with the rules. And give attention. The basic principle of a whistle is to apply the exhaled air blown from an air supply port to an edge, and amplify the edge tone generated at this time by a resonance part to make a loud sound. If the length of the resonance part is shortened or its volume is reduced, the resonance frequency rises, and a high sound is generated. Conversely, if the length of the resonance part is lengthened or its volume is increased, the resonance frequency is lowered and the sound becomes low.

A whistle whose pitch can be changed by utilizing such a principle is known. For example, Jikken 39-3527
No. 1 discloses a structure in which an adjustable rod that can move forward and backward is fitted to the other end of a whistle tube having a whistle port on one end side, and the rod is moved forward or backward to change the sound of the whistle. In Japanese Utility Model Publication No. 57-34559, a whistle consisting of a whistle main body and a whistle mouth is formed with three holes (resonance parts) having different depths in the whistle main body, and three holes are formed by rotating the whistle mouth. A different pitch is obtained by selecting the hole and sending air. A whistle having such a structure is practically used and is commercially available.

[0004]

[Problems to be Solved by the Invention]
9-35271), the frequency of which can be changed, but since the frequency is always a single frequency, the sound is monotonous and cannot be called a pleasant sound. In addition, the above publication (Jun 57
The structure disclosed in JP-A-34559) has three holes of different depths serving as resonance portions, all three of which are sounded to form a mixed chord of three types, and the deepest hole is closed. , Only the other two holes are sounded to generate a high pitch.

In FIG. 9, a frequency c1 (2.7 kHz)
z), c2 (2.9 kHz), c3 (3.1 kHz)
Indicates the frequency of the whistle (commercially available product) having such a structure, and the synthesized sound of all frequencies c1, c2, and c3 is a chord, and the frequency c
The synthesized sound of 2, c3 is emitted as a high sound. As can be seen from the figure, the frequency of each hole is not selected as it is not an unpleasant sound, and there is no large difference between the frequencies, and the frequency cannot be constant and variable for each hole. Even if the sound is made to sound, the pitch obtained is limited, and it is difficult to make a clear difference between the pitches because the sound has a similar frequency. In order to respond to this, it is necessary to provide a large number of holes of different frequencies in order to generate sound over a wide frequency range, and the above-mentioned publication discloses that four or more holes are provided. There is a structural limit to greatly increasing.

[0006] A combination of sounds having two or more frequencies is unfavorable because a combination of sounds having greatly different frequencies often results in an unpleasant sound having a sound quality different from that of the original sound. There is an appropriate range for the difference between the frequencies of the combined sounds, but if the frequencies of the sounds of the respective resonance parts are selected within this range, there is a problem that a combination sound with a difference cannot be obtained only by combining these. is there.

The present invention has been made in view of such circumstances, and combines a plurality of sounds having an appropriate frequency difference.
It is another object of the present invention to provide a whistle capable of continuously changing the pitch over a wide frequency range while maintaining the frequency relationship.

[0008]

Means for Solving the Problems The present invention (claim 1) provides:
In a whistle having an air supply port, a resonance section into which air blown from the air supply port is introduced, and a singing mouth formed between the air supply port and the resonance section, the resonance section has a volume. A common volume changing means comprising a plurality of different resonance units and changing the volume of each resonance unit is provided. In such a configuration, the volumes of the plurality of resonance units are changed simultaneously and by the same amount by a common volume changing unit, and while the frequency difference of each resonance unit is kept constant, the frequency changes and the pitch changes.

In the present invention (Claim 2), the volume variable means includes a piston member that slides in each of the resonance sections,
A piston rod member having one end connected to the piston and the other end extending outside each of the resonance sections, and having different lengths for each of the resonance sections, and the other ends of the plurality of piston rod members being fixed. By having one imaging unit, moving the imaging unit back and forth, and pulling out the piston member and the piston rod member from each resonance unit or pushing it into each resonance unit, the volume in each resonance unit is increased. To change the pitch. In such a configuration, a difference occurs in the resonance frequency of each resonance section in accordance with the difference in the length of the piston rod member in each resonance section. The movement width of the piston rod member of each resonance unit becomes the same due to the movement of the imaging unit in the front-back direction, and each frequency increases or decreases while the frequency difference is kept substantially constant.

[0010] In the present invention (claim 3), the resonance frequency of each of the plurality of resonance parts is 0.1 to 0.4.
It differs in the kHz range. In such a configuration, the difference in frequency at each resonance section is 0.1 to 0.5.
It is in the range of 4 kHz. Therefore, the combination sound
It becomes a combination sound of close frequencies, and a beat (undulation, sound) sound that does not make the listener feel uncomfortable or uncomfortable is obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 5, 1 is a mouthpiece, 2 is a resonance part, and 3 is a photographing part, both of which are made of synthetic resin. The mouthpiece portion 1 is provided with an elongated rectangular air supply port 4 to which the lips are applied and breath is blown. The resonance section 2 is cylindrical as a whole, and the first and second resonance sections 5a and 5b each including two cylindrical spaces therein are arranged so as to be up and down when the air supply port 4 is in the left-right direction. ing. 6a and 6b are first and second air supply paths for sending air from the air supply port 4 to the first and second resonance units 5a and 5b, and 7a and 7b are first and second air supply paths 6a and 6b. The first and second singing mouths are formed by openings formed between the first and second resonance units 5a and 5b.

The mouthpiece section 1 and the resonance section 2 are composed of three members, an upper member 8, a lower member 9, and an intermediate member 10, which are bonded and integrated. The first member 7a is formed on the upper member 8, and the second member 7b is formed on the lower member 9.
Are formed. Further, a first air supply passage 6a and a first resonance portion 5a are provided between the upper member 8 and the intermediate member 10, and a second air supply passage 6b and the second resonance portion 5b are provided between the lower member 9 and the intermediate member 10. Are formed.

11a and 11b are first and second resonance sections a,
5b, first and second piston members, 12a, 1
Reference numeral 2b denotes first and second piston rod members having one end connected to the first and second piston members 11a and 11b and the other end extending out of the resonance unit 2, and having different lengths. That is, the first piston rod member 12a
Is longer than the second piston rod member 12b, so that the volume of the first resonance portion 5a is set smaller than the volume of the second resonance portion 5b. Reference numeral 3 denotes the above-described photographing unit fixed to the other ends of the first and second piston rod members 12a and 12b.
The resonance part 2 side is formed in a circular shape, and the other end side is formed flat, and a flat part is provided with a hole 13 through which a hanging string (not shown) is passed. These first and second piston members 11a, 1
1b, the first and second piston rod members 12a and 12b, and the photographing unit 3 constitute a volume changing unit. These parts are also formed of a synthetic resin.

Reference numerals 14a and 14b denote first and second stoppers integrally formed with the first and second piston rod members 12a and 12b, respectively.
Regulate the maximum withdrawal length of 2b. When the first and second stoppers 14a and 14b are pulled out to the maximum, these are the first and second stoppers 14a and 14b.
The surface s which abuts on the end (left end in the figure) of the second resonance portions 5a and 5b is formed at the same position as the first and second stoppers 14a and 14b, and these are simultaneously the first and second resonance portions. It contacts the ends of the parts 5a and 5b. Reference numeral 15 denotes a projection having a semicircular cross section formed near the bases (left ends in the figure) of the first and second piston rod members 12a and 12b, which gives a click feeling to the pushing operation of the photographing unit 3.

Reference numeral 16 denotes an O-ring for maintaining an airtight state in the first and second resonance portions 5a and 5b, and the first and second piston members 11a and 11b, the first and second stoppers 14 are provided.
The first and second piston rod members 12a and 12b are fitted between the first and second piston rod members 12a and 12b. Grease is applied to the first and second piston members 11a and 11b, the first and second piston rod members 12a and 12b, and the O-ring 16, so that the movement is smooth. Although the first and second resonance parts 5a and 5b are formed in the same shape, since the first and second piston rod members 12a and 12b have different lengths, the volumes of the first and second resonance parts 5a and 5b are different. Are different.

FIG. 4 shows that the photographing unit 3 is pushed into the resonance unit 2 and
In the case where the volume of the first and second resonance units 5a and 5b is minimized (treble), FIG. 5 shows that the photographing unit 3 is pulled out of the resonance unit 2 and the volume of the first and second resonance units 5a and 5b is reduced. Indicates the maximum (bass). The resonance frequency of the first resonance unit 5a having a small volume is set to 3.85 kHz at the minimum volume when the imaging unit 3 is pushed in, and 2.75 kHz at the maximum volume when the imaging unit 3 is pulled out. By moving the photographing unit 3 back and forth, it changes linearly between these frequencies. On the other hand, the resonance frequency of the second resonance unit 5b having a large volume is the frequency at the time of the minimum volume where the photographing unit 3 is pushed.
The frequency at the time of 60 kHz and the maximum volume at which the photographing unit 3 is pulled out is set to 2.60 kHz. When the photographing unit 3 is moved back and forth, the frequency changes linearly between these frequencies. The frequencies of the first and second resonance parts 5a and 5b are shifted from each other in a range of 0.15 to 0.25 kHz.
The two interfere to generate a beat sound.

FIG. 6 is an enlarged waveform diagram of the frequencies a (2.75 kHz) and b (2.60 kHz) of the first and second resonance sections 5a and 5b, and the combined frequency a + b of both. FIG.
Is a waveform diagram (with time intervals compressed) corresponding to FIG.
Each frequency a (see FIG. 7A) of the first and second resonance units 5a and 5b at the time of the lowest sound (when the imaging unit 3 is pulled out), b
Specific examples of (see FIG. 7 (b)) and synthesized sound a + b (see (c) of FIG. 7) are shown. The synthesized sound a + b is a beat sound having a frequency difference of 0.15 kHz between the frequencies a and b.

FIG. 8 shows a specific example of the first and second resonance sections 5a and 5b and the synthesized sound a + b at the time of the highest sound (when the photographing section 3 is pressed). The frequency a of the sound generated in the first resonance section 5a is 3.85 kHz (see FIG. 8A),
The frequency b of the sound generated in the resonance section 5b is 3.60 kHz.
(See FIG. 8B), the frequency difference is 0.25 kHz.
z. This synthesized sound a + b is a beat sound of 0.25 kHz (see FIG. 8C).

As shown in FIGS. 7 and 8, the resonance sections 5a, 5b
However, the waveform of each of the sounds emitted independently has a constant amplitude, becomes a monotonous sound, and has a small effect of attracting human attention. On the other hand, when two waveforms having different frequencies are synthesized, the two interfere with each other to emit a beat sound corresponding to the frequency difference, and this sounds to the ears of a person and acts to draw attention. In addition, it is preferable that the frequency difference between sounds having different frequencies be in the range of 0.1 to 0.4 kHz, since sounds having low sound quality are overlapped with each other, and a sound that is comfortable to the ear without discomfort is obtained. On the other hand, when the frequency difference is larger than the above range, the sound is different from the original sound and is often felt unpleasant. The difference between the two is 0.1k
When the frequency is less than Hz, there is a problem that the sound becomes almost monotonous because a beat sound effect hardly occurs.

The sound emitted from the first and second resonance parts 5a and 5b is kept within a frequency difference of 0.1 to 0.4 kHz. It is changed linearly in the range of .60 to 3.85 kHz. Within this range, the two whistles of the structure according to the present embodiment are moved to a position where they are not far apart,
For example, even when used on adjacent courts, by shifting the position of the shooting unit 3, the two can be made to have beat sounds of different pitches, without being confused, and there is no risk of affecting the game.

In FIG. 9, the frequencies a1 and a2 are minimum values (2.75 kHz) of the resonance frequency by the first resonance section 5a.
And the maximum value (3.85 kHz) with the frequencies b1, b2
Is the minimum value of the resonance frequency by the second resonance unit 5b (2.60
kHz) and a maximum value (3.60 kHz), and the frequencies a and b of the first and second resonance units 5a and 5b are arbitrarily set between the minimum value and the maximum value. From the figure, it can be seen that a wider frequency range can be set than the frequency distribution of the frequencies c1, c2, c3 applied to the whistle of the conventional structure.

[0022]

According to the present invention (claim 1), since a plurality of resonance portions having different volumes are provided, different resonance frequencies interfere with each other, and a beat sound with a high alertness can be generated. In addition, since there is a volume enabling means for simultaneously changing the volume of the resonance unit by the same amount, the frequency of the beat sound can be linearly and arbitrarily changed and adjusted over a wide range while the resonance frequency difference is kept substantially constant. A single whistle can generate a variety of different pitches.

According to the present invention (claim 2), since the volume of the resonance part is determined by the position of the piston member, the position of the piston member is changed by changing the length of the piston rod member in the plurality of resonance parts. And the resonance frequency of each resonance section can be changed. The difference in frequency can be set to an arbitrary value by the difference in length of the piston rod member. Further, the other end of the piston rod member, that is, the end opposite to the end connected to the piston member,
By being fixed to one imaging unit and moving it back and forth, the volume of each resonance unit can be simultaneously changed by the same amount. Therefore, the frequency is varied while the frequency difference between the resonance portions is maintained substantially constant, and a sound having a predetermined beat can be obtained in a wide frequency range.

According to the present invention (claim 3), when changing the resonance frequency, the difference between the plurality of resonance frequencies is 0.1 to
Since the frequency is kept substantially constant in the range of 0.4 kHz, sounds having frequencies close to each other are overlapped, and a beat sound that is comfortable to the ears and has alertness can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a whistle according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a mouthpiece portion and a resonance portion of the whistle of FIG.

FIG. 3 is a perspective view showing a mouthpiece portion of the whistle of FIG. 1;

FIG. 4 is a sectional view of the whistle of FIG. 1;

FIG. 5 is a sectional view corresponding to the line IV-IV in FIG. 1;

FIG. 6 is a waveform diagram showing frequencies a and b generated in first and second resonance units 5a and 5b and a combined frequency a + b thereof.

FIG. 7 is a waveform diagram when a low tone is generated.

FIG. 8 is a waveform diagram when a high sound is generated.

FIG. 9 is a diagram showing a frequency band.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mouthpiece part 2 Resonance part 3 Shooting part 4 Air supply port 5a First resonance part 5b Second resonance part 6a First air supply path 6b Second air supply path 7a First mouthpiece 7b Second mouthpiece 8 Upper member 9 Lower member 10 Intermediate member 11a First piston member 11b Second piston member 12a First piston rod member 12b Second piston rod member 14a First stopper 14b Second stopper 15 Projection 16 O-ring

Claims (3)

[Claims] 1. A whistle having an air supply port, a resonating portion into which air blown from the air supply port is introduced, and a singing mouth formed between the air supply port and the resonating portion, The whistle, wherein the part comprises a plurality of resonance parts having different volumes, and a common volume changing means for changing the volume of each resonance part is provided. 2. The apparatus according to claim 1, wherein said volume changing means includes a piston member sliding in each of said resonance sections, one end connected to said piston, and the other end extending outside said resonance sections. It has a piston rod member having different lengths, and one photographing part to which the other ends of the plurality of piston rods are fixed, and moves the photographing part back and forth to move the piston member and the piston rod member. By pulling out from each resonance part or pushing it into each resonance part,
2. The whistle according to claim 1, wherein a volume in each of the resonance sections is changed to change a pitch. 3. The whistle according to claim 1, wherein the resonance frequencies of the plurality of resonance sections are different in a range of 0.1 to 0.4 kHz.