PSYCH 3A03 Lecture Notes - Spectrogram, Sideband, Amplitude Modulation

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3A03
• Professor: Paul Faure

Document Summary

This outline summarizes major points covered in lecture. It is not intended to replace your own lecture notes. Law of reflection applies to both planar and spherical waves. Reverberant waves (echoes) reflected sound waves. Reverberation time: time for intensity of reflected sound wave to reach -60 db re: source intensity (i. e. time for energy in reverberant waves to damp down to one millionth of source energy) Reflected wave can be considered as a second sound source. Reflected waves can interact (interfere) with incident waves. Interference can result in standing wave with nodes (zero amplitude) and anti-nodes (max amplitude: constructive interference increase in amplitude of sound energy, destructive interference decrease in amplitude of sound energy. Phase relationship does not need to be exact for interference to occur. Fundamental frequency ( 0): lowest frequency that creates standing wave pattern. Second harmonic frequency second lowest frequency of vibration (= 2 0)