- #1
Loren Booda
- 3,125
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What effect does the sphere inside of a police whistle have on its resultant sound?
Police Whistle: Impact of Inner Sphere on Sound Quality
- Thread starter Loren Booda
- Start date
In summary: The size of the chamber determines how far the air has to travel before it can escape through the sound hole.In summary, the sphere inside of a police whistle, also known as a pea whistle, plays a crucial role in altering the airflow and producing a distinct tone. The air stream enters through the mouthpiece and hits the bevel, splitting outwards and filling the air chamber until the air pressure is high enough to pop out of the sound hole. The pea inside the chamber interrupts the flow of air, changing the rate of packing and unpacking and creating the distinct warble sound of the whistle. The size of the chamber also plays a role in determining the pitch of the sound.
- #2
Spin_Network
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- 0
Loren Booda said:
I believe it intensifies the sound?
The police whistle I think, is a variant of TIN WHISTLE, which is just an instrument that produces only 2-Octave sounds?
The principle and dynamics of Tin whistle's, can occur when opening a sunroof of a moving car for instance.
Here is a link that explains a little more:http://en.wikipedia.org/wiki/Whistle
I am going to assume that you are delving into Particle-In-A-Box and the Police Whistle is thus an analogy of sorts?
Afterthought..maybe the input and output of a spherical Blackhole?
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- #3
Danger
Gold Member
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If not, then I will go back to the original 'pea-whistle'. The whole point of having the 'pea' or other spherical body in the whistle is to alter the airflow and thus produce a tone. Think of it as a person doing a '2 finger whistle'.Spin_Network said:
- #4
Loren Booda
- 3,125
- 4
Pea whistle it is. What is the acoustic (mathematical) sense for using the pea?
- #5
GOD__AM
- 210
- 0
I got the following information from this link http://www.kenaston.org/History/RefereeWhistle.html
In a pea whistle, the air stream enters through the mouthpiece as shown (1). It hits the bevel (2), and splits outwards into the air, and inwards filling the air chamber (3) until the air pressure inside the chamber is so great, it pops out of the sound hole, making room in the chamber for the whole process to start over again. The pea (4) gets forced around and around and interrupts the flow of air and changes the rate of air packing and unpacking inside the air chamber. This creates the sound of the whistle warble.
The air stream enters through the whistle's mouthpiece as shown.
The air inside a whistle chamber packs and unpacks 263 times every second to make the note middle-C. The faster the packing and unpacking is, the higher- pitched the sound the whistle creates.
In a pea whistle, the air stream enters through the mouthpiece as shown (1). It hits the bevel (2), and splits outwards into the air, and inwards filling the air chamber (3) until the air pressure inside the chamber is so great, it pops out of the sound hole, making room in the chamber for the whole process to start over again. The pea (4) gets forced around and around and interrupts the flow of air and changes the rate of air packing and unpacking inside the air chamber. This creates the sound of the whistle warble.
The air stream enters through the whistle's mouthpiece as shown.
The air inside a whistle chamber packs and unpacks 263 times every second to make the note middle-C. The faster the packing and unpacking is, the higher- pitched the sound the whistle creates.
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1. How does the inner sphere of a police whistle impact its sound quality?
The inner sphere of a police whistle is responsible for creating the sound when air is forced through it. The size, shape, and material of the inner sphere can greatly affect the tone, pitch, and volume of the sound produced.
2. What materials are commonly used for the inner sphere of a police whistle?
The most common materials used for the inner sphere of a police whistle are metal, plastic, or wood. Each material has its own unique properties that can influence the sound quality of the whistle.
3. How does the size of the inner sphere impact the sound of a police whistle?
The size of the inner sphere can affect the volume and pitch of the sound produced by a police whistle. A larger inner sphere will typically create a louder sound, while a smaller inner sphere will create a higher-pitched sound.
4. Can the shape of the inner sphere affect the sound quality of a police whistle?
Yes, the shape of the inner sphere can also impact the sound quality of a police whistle. A spherical inner sphere will create a more uniform sound, while a cone-shaped inner sphere may produce a more focused and piercing sound.
5. Is the impact of the inner sphere on sound quality unique to police whistles?
No, the impact of the inner sphere on sound quality is not unique to police whistles. This principle applies to any instrument or device that uses air to create sound, such as flutes, trumpets, and even whistles used in sports. The inner sphere plays a crucial role in shaping the sound produced.
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