BCS 260 Lecture Notes - Lecture 4: Sine Wave, String Vibration, Longitudinal Wave
26 Sep 2016
School
Department
Course
Professor
Document Summary
Bcs 260: acoustic principles and the auditory system. ***aperiodic waves that don"t repeat (noise) unhitched ex. drum sound. Pure tone graphed as a sine wave frequency - measurement of # of cycles of periodic waves that pass a point in a given time span also hertz (hz) higher freq -> more cycles per sec. > shorter period (amount of time for one cycle frequency to pitch freq mapped on keyboard low to high 27. 5 to 4186 hz each octave doubles the frequency octave is a 2:1 pitch -> log(freq) # and strength of partials give musical tone its timbre or tone quality odd # partials give carnet sound (hear series of tone pairs) Rst with 12 partials with only the 6 odd number partials spectrum- shows partials & di erent amplitudes violin broadest spectrum of partials oboe 1st overtone strong clarinet odd partials (missing 2nd one) Ute does have a lot of higher freq components.
