Next: Digitizing Audio
Up: Basics of Digital Audio
Previous: Application of Digital Audio
Let us first analyse what a sound actually is:
- Sound is a continuous wave that travels through the air
- The wave is made up of pressure differences. Sound is detected by
measuring the pressure level at a location.
- Sound waves have normal wave properties (reflection, refraction,
diffraction, etc.).
A variety of sound sources:
- Source
- -- Generates Sound
- Air Pressure changes
- Electrical -- Loud Speaker
- Acoustic -- Direct Pressure Variations
The destination receives (sensed the sound wave pressure changes) and has to deal with
accordingly:
- Destination
- -- Receives Sound
- Electrical -- Microphone produces electric signal
- Ears -- Responds to pressure hear sound
Sound is required input into a computer: it needs to sampled or digitised:
Continuous Analog Waveform
Next: Digitizing Audio
Up: Basics of Digital Audio
Previous: Application of Digital Audio
Dave Marshall
10/4/2001