Casio EA-200 User Manual

Page 29

20020601

English

Activity: Operating the Equipment

Measurement

2-8-2

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Other Things To Do

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í Analyzing Do-Re-Mi

u Record the notes Do, Re, and Mi, and then record the peaks of their frequency distribu-

tions. These are called “frequency components.”

u Study the relationship of the frequency components included in the single-note frequency

distribution.

u Study the relationship of the highest peaks of different notes.

í Octaves

u Record Do in two adjoining octaves, and make a note of its frequency components.
u On 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.

í Consonant Notes

u The 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.

u Sounds 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.

u Using the EA-200’s frequency conversion function, create and produce consonant notes.

Next, play the same notes on the piano for comparison.

í Electronic Sound

u Use 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.

í Calculator Operation

u Record the sound on the EA-200, perform FFT analysis, and view the frequency.
u Find the applicable program in the Program Library (P.2-16-2), input it into your calculator,

and then run it.

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

u Consider why notes synthesized on the EA-200 are different from those produced

by the piano.

u In many cases, physical properties become evident by studying frequency

components. Consider why this is so.

u Consider what noise is by checking its frequency components.

Waveform

Frequency
Distribution

Peak

Before Conversion

After Conversion

(Hz)

: Frequency

(counts) : Number of Counts

u Find 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