AET 1380 Lecture Notes - Lecture 3: Synthesizer, Sound Energy, Refraction

• School: Belmont University
• Department: Audio Engineering Technology
• Course: AET 1380
• Professor: Time Brown

Document Summary

Timbre: most sounds are made up of more than one discrete frequency consisting of, fundamental, overtones. Harmonics are 880 (1x), 1320 (2x), 1760 (3x), etc: typical harmonics are, 2nd 4th 6th etc. = even (warm sounding: 3rd 5th 7th etc. = odd (harsh sounding: timbre the key to an instrument"s sound. Envelope: characteristic variations in level that occur over the duration of a played note (over time, one way that instruments sound different, adsr, attack decay sustain release. Describes the behavior of sound waves in a room. Sound reflects off of surfaces at angle equal (and opposite) to angle of incidence. Predictable result involving smooth, concave, and convex surfaces: concave focused into a point, convex focused out of the point. Some sound energy absorbed by surface material. Some sound energy reflected by surface material. Scattering of sound in all directions on reflection from a surface. Spreads around barriers: low frequencies more omni directional, high frequencies more directional.