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Revision as of 17:36, 2 February 2010 by Craffel (Created page with 'This is an attempt to keep track of the various numbers and approximations that are good to have in your hip-pocket when studying audio and music. == Physics == * Sound travels …')
This is an attempt to keep track of the various numbers and approximations that are good to have in your hip-pocket when studying audio and music.
- Sound travels roughly 1 foot every millisecond
- Humans can usually hear from about 20 Hz to 20,000 Hz (20 kHz)
- Perception of "loudness" for different frequencies is (very) roughly flat from about 100 Hz to 10 kHz, for most decibel levels. Pitches sound much less loud outside of this range.
- About 6 dB of Signal to Noise Ratio is gained per bit when quantizing continuous values.
- In order to avoid aliasing, the sampling frequency must be two times that of the highest frequency present in the signal.