Activity: Operating the Equipment

￿Analyzing Do-Re-Mi

uRecord the notes Do, Re, and Mi, and then record the peaks of their frequency distribu- tions. These are called “frequency components.”

uStudy the relationship of the frequency components included in the single-note frequency distribution.

uStudy the relationship of the highest peaks of different notes.

1 Waveform

1

2

2 Frequency

 

3

Distribution

 

3

3 Peak

 

 

 

 

 

￿Octaves

uRecord Do in two adjoining octaves, and make a note of its frequency components.

uOn the EA-200, double the frequency of the lower Do to synthesize the higher Do, and then compare the result with the corresponding note played on the piano.

￿Consonant Notes

uThe sound at a frequency ratio of 1:1 is the original sound, and the sound at 2:1 is called an “octave.” Two notes such as these are said to possess “absolute consonance.” Play the same note in two different octaves to see what absolute consonance sounds like.

uSounds at the frequency ratios 3:2 and 4:3 possess “perfect consonance,” sounds at 5:3 and 5:4 possess “medial consonance,” and sounds at 6:5 and 8:5 possess “imperfect consonance” Predict the consonance of Do-Re-Mi from their frequencies, and then actually play the notes on the piano.

uUsing the EA-200’s frequency conversion function, create and produce consonant notes. Next, play the same notes on the piano for comparison.

￿Electronic Sound

uUse the EA-200 to record Do played using a piano timbre on the computer MIDI sound source, and check its frequency components. Next, compare this with the frequency component of Do played on the acoustic piano.

2-8-2

English

Measurementasurement

￿Calculator Operation

uRecord the sound on the EA-200, perform FFT analysis, and view the frequency.

uFind the applicable program in the Program Library (P.2-16-2), input it into your calculator, and then run it.

uUse the EA-200 frequency conversion function to create synthesized sounds.

1Before Conversion

2After Conversion

f(Hz)

: Frequency

N(counts) : Number of Counts

uFind the applicable program (Natural Frequency and Sound) in the Program Library (P.2-16-2) , input it into your calculator, and then run it to use FFT graph (1, 2).

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uConsider why notes synthesized on the EA-200 are different from those produced by the piano.

uIn many cases, physical properties become evident by studying frequency components. Consider why this is so.

uConsider what noise is by checking its frequency components.

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