MusicianCV · TRHarmonic seventh
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Tuning and pitch systems
Harmonic seventh · 7:4 → 200 × 7/4 = 350 Hz
Fix a reference frequency before comparing tunings. An octave doubles frequency. Convert a frequency ratio to cents with 1200 × log₂(ratio).
Example
Read the ratio alongside the worked calculation. · 7:4 / 200 × 7/4 = 350 Hz
Read the ratio alongside the worked calculation.7:4 200 × 7/4 = 350 Hz
Try it
How does a frequency difference differ from a ratio?
Answer
Moving the same interval to another pitch preserves the ratio. The difference in hertz can change.Related topics
Reading small pitch differences in centsReferences
Frequency and Pitch of Sound
Subject-expert review pending.