Question 2
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Question 2 a) Below is a frequencies of a “c-soprano descent recorder” from lecture notes. Note
Freq (Hz)
C
261.62 6 D4 293.65 5 E4 329.62 8 F#4 369.99 0 A4 440.00 0 B4 493.88 3 C5 523.25 1
hole 0
hole 1
hole 2
hole 3
hole 4
hole 5
hole 6
hole 7
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
o
x
x
x
x
x
x
o
o
x
x
x
x
x
o
o
o
x
x
x
o
o
o
o
o
x
x
o
o
o
o
o
o
x
o
x
o
o
o
o
o
b) 10 seconds of pure tones can be hear at cd. c) Note
Ideal Freq (Hz)
Measured Freq (Hz) (dominant)
C4 D4 E4 F#4 A4 B4 C5
261.63 293.63 329.63 369.99 440.00 493.88 523.25
259 290 329 369 445 482 524
d) From my observation, the value of measured frequency of each notes above ( c ) is near with ideal frequency. The difference value is cause by sound disturbance from surrounding such as air flow, foot steps and radio music. So that, we can assumed that the sound disturbance is not too effected the frequency notes.
Freq (Hz)
C
261.62 6 D4 293.65 5 E4 329.62 8 F#4 369.99 0 A4 440.00 0 B4 493.88 3 C5 523.25 1
hole 0
hole 1
hole 2
hole 3
hole 4
hole 5
hole 6
hole 7
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
o
x
x
x
x
x
x
o
o
x
x
x
x
x
o
o
o
x
x
x
o
o
o
o
o
x
x
o
o
o
o
o
o
x
o
x
o
o
o
o
o
b) 10 seconds of pure tones can be hear at cd. c) Note
Ideal Freq (Hz)
Measured Freq (Hz) (dominant)
C4 D4 E4 F#4 A4 B4 C5
261.63 293.63 329.63 369.99 440.00 493.88 523.25
259 290 329 369 445 482 524
d) From my observation, the value of measured frequency of each notes above ( c ) is near with ideal frequency. The difference value is cause by sound disturbance from surrounding such as air flow, foot steps and radio music. So that, we can assumed that the sound disturbance is not too effected the frequency notes.
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