"Sound" existing in this world is created by vibration of objects such as air and water. A site that can interactively know such "sound formation" is "Let's Learn About Waveforms"is. On this site, it ...
When the arbitrary waveform generator (Arb) was introduced by Wavetek in 1975, a few design and test engineers jumped up and down for joy, but most failed to see the potential of this new signal ...