Digital Audio Expansion Hub

[Music] before we consider how sound is stored and processed by a computer let's first consider what sound actually is and how it's captured this is an abstract model of the air around us in reality the air molecules are not uniformly sized and spaced like this and they're in a constant state of random motion even when there's no noise at all nevertheless when a sound is made perhaps by the clap of a pair of hands a vibrating guitar string or someone's voice the air molecules nearby are disturbed as each molecule collides with its nearest neighbours a wave of alternating compressions and decompressions moves away from the source of the sound on a dry day at 20 degrees celsius this longitudinal wave travels at a speed of 343 meters per second to capture this sound we can use a microphone a dynamic microphone contains a magnet surrounded by a coil of copper wire and attached to the coil i