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Relationship between Frequency and Pitch
The frequency range of 20Hz to 20kHz is equivalent to about 10 octaves in pitch. An octave on a piano equals 12 notes (semitones). The higher the frequency the higher the pitch. A4 on a piano is 440Hz, therefore A5 is 880Hz and A3 is 220Hz (see diagram below).
- Every increase in pitch by 1 octave = double the frequency.
- Every decrease in pitch by 1 octave = halving the frequency.