What is Sound?
A Vibrating Source
Characteristics of a Sound Wave
How Sound Travels in Air
Simple and Complex Sounds
Frequency Spectra of Repetitive Sounds
Frequency Spectra of Non-repetitive Sounds
Sound in Electrical Form
Displaying the Characteristics of a Sound Wave
Sound Power and Sound Pressure
Free and Reverberant Fields
A VIBRATING SOURCE
Sound is produced when an object (the source) vibrates and causes the air around it to move. Consider the sphere shown in Figure 1.1. It is a pulsating sphere which could be imagined as something like a squash ball, and it is pulsating regularly so that its size oscillates between being slightly larger than normal and then slightly smaller than ...