A Vibrating SourceCharacteristics of a Sound WaveHow Sound Travels in AirSimple and Complex SoundsFrequency Spectra of Repetitive SoundsFrequency Spectra of Non-Repetitive SoundsPhaseSound in Electrical FormDisplaying the Characteristics of a Sound WaveThe DecibelSound Power and Sound PressureFree and Reverberant FieldsStanding WavesRecommended Further Reading