Sound Quality Chapter 21 Sect. 4

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Presentation transcript:

Sound Quality Chapter 21 Sect. 4

Sound Quality warm-up: textbook p. 626 Passage-2 all Q’s … 1-2-3

Sound Quality https://www.youtube.com /watch?v=XMZW4Ol5zLk Today, I can describe the difference between noise and music

Sound Quality: Resonance (rez-O-nunce) (from Monday’s lesson) Resonance occurs when two objects naturally vibrate at the same frequency. The wave (sound) produced by one of the objects causes the other object to vibrate.

Sound Quality: Interference Interference the combination of two or more waves that result in a single wave. ex: a sonic boom Sound Quality the result of the blending of several pitches (frequencies) through interference. ex: musical instruments have pleasing sound quality if operated properly

Sound Quality: Resonance and Musical Instruments Musical instruments use resonance to make sounds. String instruments  strings vibrate & send waves inside the hollow instrument body, where it is amplified Wind instruments  blowing air causes mouthpiece vibrations … resulting sound waves are amplified inside the tubes/pipes Percussion instruments  make sounds when struck … different sizes & materials have different pitches

Strings p. 619

Winds p. 620

Percussion p. 621

Sound Quality: Noise Noise is any sound (especially non-musical) that is a random mix of frequencies (pitches) … shows no regular pattern Music shows distinct repeating patterns

Music vs. Noise