[Acoustics] Lab 3: Consonance / Dissonance (Combination tones)

The Music Telegraph | Text 2018/12/11 [12:05]

[Acoustics] Lab 3: Consonance / Dissonance (Combination tones)

The Music Telegraph| 입력 : 2018/12/11 [12:05]

 



Consonance / Dissonance (Combination tones)

 

Two sine wave tones are played together. The upper tones sweeps up to the octave while the lower tone constantly plays A 220 Hz. At first when the tones play unison  they start to sound pleasant (consonant), and when the tones are far apart, there appear to be just 2 the two tones then unpleasant (dissonant). When the tones get very close together they will start develop combination tones. You will hear one or two additional frequencies. They are the result of combining the two sine waves. When the tones are very close together, they will cease to sound like 2 different tones, but now will start to beat or pulse with a frequency that is the mathematical difference between the frequencies. These beat frequencies are what musicians use when tuning instruments. It is how they stay in tune when playing together.

 

 

Intervals: Octave

An octave in musician’s terms means a doubling (or halving) of a pitch’s frequency

 

Intervals: minor 3rd

 

Intervals: 4th (feel “sinister”)

 

Intervals: 5th (feel “pleasing”)

 

Intervals: 7th (dominant)

 

Intervals: 7th (Major)

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