The physics of sound: note frequencies, decibels, harmonics, tempo and the Doppler pitch shift
Frequency of a note n semitones from a reference pitch.
An octave above a note has exactly double its frequency.
Sound intensity expressed in decibels relative to the hearing threshold.
Total level when two sound sources play together.
Sound speed equals frequency times wavelength.
Fundamental pitch of a string from length, tension and mass.
Overtones of a note are whole-number multiples of the fundamental.
Measures the size of a musical interval in cents.
Length of one beat in seconds from the tempo.
Milliseconds per beat, used to sync echo/delay effects to a song.
Observed pitch changes as a source moves toward or away.
Lowest standing-wave frequency between two parallel walls.
Frequency is the reciprocal of the wave's period.
Lowest note of a pipe open at both ends (like a flute).
A 10 dB increase is heard as roughly twice as loud.
Time for sound to decay 60 dB in a room.
Converts frequency to the perceptual mel pitch scale.