▲ Octave band analysis © Ono Sokki Co.

 

Properties of harmonic interval

 

 

Chords:

- Perception of chord is based on frequency differences

Chord	Frequency Ratio
Major (1 3 5)	4:5:6
Minor (1 3b 5)	10:12:15

 

 

 

Critical Bands:

- Ear’s perception of frequency combinations

- 1/3 octave wide

 

[2 notes]

a) More than 1/3 octave distance ==> No interaction

b) At 1/3 octave interaction ==> 'Consonance' (pleasant) or 'Dissonance' (unpleasant)

▲ ©The Music Telegraph

 

 

 

*Each octave has different number of frequency:

e.g. A3 note = 220 Hz, A4 note = 440 Hz, A5 note = 880 Hz 

 

 

 

 

 

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