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3.01 Audio
Question | Answer |
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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 | 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 File Format | MPEG-1 Audio Layer 3 |
WAV File Format | Waveform file |
OGG File Format | Ogg Vorbis |
AIFF File Format | Audio Interchange File Format |