PSY384H5 Lecture Notes - Lecture 1: Greatest Common Divisor, Tuning Fork, Sine Wave
Document Summary
What is sound: disturbance of air that we sense through our auditory system, all sound originates with motion, sound takes time to travel, not all pressure variations are audible to humans (20-20 000 cps/hertz) Sounds differ in 3 ways: loudness( how hard tuning fork is struck, pitch ( middle c vs. middle g on piano, quality ( piano vs. violin) Whenever sounds differ in quality we find they have different wave shapes. Characterization of sound: repetitive (periodic, non- repetitive (non-periodic) Not in natural speech - in natural speech (vowel) - no regular repeating pattern - Sine wave (tuning fork) -piano note -fricative sounds (shhh, hiss) - ex. **complex and simple sounds both involve repeating waveform pattern cycles. Tuning fork: produce smooth /simple wave, simple sounds rare in nature, most common are complex sounds. 2 identical tuning forks can vary in loudness but not in pitch and quality.
