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Topic: how tones generated
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AuthorTopic:   how tones generated
Registered User

posted: 6/2/2006 at 3:43:18 PM ET
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I have to create an illustration showing how tones are generated and how musical instruments produce sound, using the 5 general groups of instruments.
1. brass
2. woodwinds
3. percussion
4. electronic
5. keyboard
Does anyone know how to explain this?

Registered User

posted: 6/5/2006 at 7:00:09 PM ET
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Not sure how you might illustrate this, but here goes:

All sound is created through a vibration of some sort, whether that of a string, or your vocal cords, or even air. These vibrations travel through the air as sound waves. The major differences between the "families" of instruments is in how each creates its own vibration.

1. Brass instruments create sound by vibrating a "column of air," in other words the air traveling through the horn. In this case, it is the player's "buzzing" lips in the mouthpiece that sets the air to vibrate.

2. Woodwinds also use a vibrating column of air to create sound, similar to the brass instruments. The difference is that they use a reed (on all but the flute) to create vibrations. The flute also creates a vibrating column of air, but in this case the vibration is caused by the player's breath "shattering" - as my woodwind techniques professor put it - as it travels across the embouchure hole.

3. Percussion is easy - anything you can hit or shake to make sound can be a percussion instrument. The obvious source of vibration is in the striking or shaking of the instrument itself.

4. All electronic instruments create sound through the exact same principle since they all use some type of speaker or amplifier. If you were to disassemble a stereo speaker, you would find, among other things, a thin disc of plastic, usually shaped almost like a cone. This disc actually vibrates with the help of a magnet, and creates sound waves.

5. Keyboard instruments use a variety of methods to produce sound. Pianos - as well as harpsichords, clavichords, and so on - create sound by getting a string or set of strings to vibrating. Several different mechanisms will do this at the touch of a key - In the case of the piano, a small "hammer" strikes the string. For the Harpsichord, small hooks pluck them. Whatever the mechanism, the common characteristic of all keyboard instruments is the keyboard itself which sets the mechanism in motion when a key is pressed.

Not all keyboard instruments use strings. See above for electronic pianos, but also consider the organ. This instrument has a set of several (sometimes hundreds) of pipes which create sound when air passes through them. The air is released into each pipe by pressing the appropriate key.

I hope that helps you - although I'[m not sure I'd know how to draw some of that.

Anonymous Poster

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posted: 12/5/2006 at 8:40:57 AM ET
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What are the five groups of instruments

Anonymous Poster

From Internet Network:

posted: 5/27/2011 at 1:53:04 PM ET
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The Five general groups of instruments are (and these categories cover any kind at all not just symphonic):
Membranophones- use a vibrating membrane to make a noise (ex. a conga drum)
Idiophones- The actual instrument vibrates (ex. a xylophone or a bell)
Aerophones- Moving air creates the sound (ex. a flute)
Chordophones- Vibrating string makes sound (ex. a banjo)
Electrophones- electronic production of a sound, coming out of a speaker (ex. keyboard)

Anonymous Poster

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posted: 5/27/2011 at 2:22:49 PM ET
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i am not sure but gone google or a search engines they will help! GOOD LUCK!

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