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 Passages 1 and 2 (all Q’s)

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) (review) 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. (positive or negative) 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