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MaWD 3.01 Audio

Lesson 3.01 Principle of Digital Audio

TermDefinition
Sound wave an audible vibration that travels through air or water.
Frequency Number of waves to pass a point in one second
Amplitude Distance from rest to crest or rest to trough
Wavelength Distance from crest to crest
Crest Point that exhibits maximum amount of upward displacement from the rest position
Trough Point that exhibits maximum amount of downward displacement from the rest position
Pitch The quality of the sound determined by the rate of vibration
Sampling process used to convert analog sound waves into digital data to be used by computers
Sample rate the number of samples taken per second, often measured in Kilohertz (kHz).
Bit rate (Depth) the number of computer bits process per unit of time.
Sample size the number of bits used to save one sample
Channel single audio stream consisting of a sequence of samples.
Mono one channel; audio is a single channel, where sound comes from a single direction
Stereo two channels; creates the impression of sound being heard from various directions, as in human hearing
Audio file size determined by the sample rate, sample size and number of channels used.
MP3 MPEG-1 Audio Layer 3
WAV Waveform file
OGG ogg vorbis
AIFF Audio interchange file format
Created by: meechaj
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