March 2013
Intermediate to advanced
73 pages
1h 34m
English
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Appendix B. Glossary
- Audio context
A container for all audio nodes in the Web Audio API graph.
- Bit depth
The number of bits allocated for each value in an audio data stream.
- Bit rate
The number of bits per second that a compressed audio file will output.
- Cents
A logarithmic unit of measure used for musical intervals. Twelve-tone equal temperament divides the octave into 12 semitones of 100 cents each.
- Clipping
What happens to an audio wave when it exceeds the highest permitted value (0 dBFS).
- Decibels
A relative unit used to measure the intensity of a sound signal.
- dBFS
Sound level relative to the full scale (nominally 0 dBFS). This unit is negative unless sound is being clipped.
- dBSPL
Sound pressure level relative to the threshold of human hearing.
- FFT
Fast Fourier Transform, an algorithm for breaking a sound wave up into its constituent sine waves.
- Hertz
A measure of frequency. The number of times per second that something happens.
- Nyquist frequency
Half of the sample rate of an audio buffer.
- PCM
Pulse code modulation, a way of storing sound waves as an array of numbers.
- Playback rate
The speed at which an audio buffer is played back.
- Sample rate
The number of times per second that an analog sound is sampled during quantization, or the process of converting an analog signal into a digital one.
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