CMD 278 Lecture Notes - Lecture 10: Fundamental Frequency, Square Root, Sine Wave
Document Summary
Amount of vibratory displacement; distance molecules are displaced from object at rest. 4 ways to measure amplitude: instantaneous. Amount of vibratory displacement at any given moment in time along the waveform: peak amplitude. Point of positive or negative maximum displacement: peak-to-peak amplitude. Total distance from point of positive maximum displacement to negative maximum displacement: rms. Square root of the mean of the squared deviatiosn of the instantaneous pressure. For sine wave, rms amplitude = peak amplitude x . 707 (1/2 square. Describes point in a cycle when an object begins to vibrate. Instantaneous phase: measurement of phase at any point along the waveform. Distance between 2 consecutive positive peaks (points of condensation) in a wave or two consecutive negative peaks (points of rarefaction) in a wave. Directly affected by hz and speed of sound. Measure of speed sound in air = c = constants (344 m/sec or 1100 ft/sec) Until now, waves have been discussed as traveling infinitely in space.
