ABSTRACT
Sound is the perception of the movement of air particles which causes a displacement of the ear-drum. The air particles are extremely small—about 400 billion billion per cubic inch—and when set in motion create patterns of sound-waves. Certain concepts in acoustics (frequency, amplitude, waveform analysis and resonance) provide the bases for an understanding of the structure of these sound-waves. The subject is dealt with by Fry (1979).
