From YIN Autocorrelation Pitch Detection to Tempered Tuning, DADGAD, and Drop D
Understand the acoustic science behind guitar pitch, why equal temperament is a mathematical compromise, how sub-cent digital autocorrelation algorithms detect pitch, and how to utilize alternate tunings like DADGAD, Open G, and Drop D.
Guitars utilize 12-Tone Equal Temperament (12-TET), which divides an octave into 12 semitones using a frequency multiplier of 2^1/12 ≈ 1.05946.
While 12-TET allows a guitar to play in all 12 keys without retuning, pure acoustic third intervals are approximately 14 cents sharper than pure mathematical harmonics. Understanding this explains why your B string can sometimes sound slightly sharp in certain open chords even when your electronic tuner shows perfect green.
DailyFret utilizes the YIN algorithm—a specialized time-domain autocorrelation DSP technique that tracks acoustic pitch with sub-cent precision (< 0.1 Hz error). By subtracting audio phase offsets and applying parabolic interpolation, it accurately isolates fundamental guitar string frequencies while filtering out room noise and pick-strike transients.
| Tuning Name | String Notes (6 to 1) | Genre / Vibe | Notable Songs / Uses |
|---|---|---|---|
| Standard E | E - A - D - G - B - E | Universal Baseline | All genres |
| Drop D | D - A - D - G - B - E | Rock / Heavy Metal / Folk | One-finger power chords, deep low-end rumble |
| DADGAD | D - A - D - G - A - D | Celtic / Fingerstyle / Jimmy Page | Lush modal drones with open string ringing |
| Open G | D - G - D - G - B - D | Blues / Keith Richards | Strumming open major chord without fretting |
| Half Step Down (E♭) | E♭ - A♭ - D♭ - G♭ - B♭ - E♭ | Hendrix, SRV, Guns N' Roses | Warmer string tone, easier bends |
Alternate tunings rearrange the fretboard, so re-anchor your note knowledge afterward with Memorize Every Note on the Guitar & Bass Fretboard.
Launch our interactive WebAudio fretboard tools to practice these concepts in real-time.
Open High-Precision Chromatic Tuner →A: Intonation refers to whether notes stay in tune as you move up the neck. If your 12th-fret fretted note matches the 12th-fret natural harmonic, your guitar has proper intonation.