Need help with...music math??? 0-0 .(I WILL GIVE MEDAL AND FAN!)http://snag.gy/UZXxi.jpg

- anonymous

Need help with...music math??? 0-0 .(I WILL GIVE MEDAL AND FAN!)http://snag.gy/UZXxi.jpg

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## More answers

- anonymous

- amistre64

yeah, i never covered this type of stuff in music class, just learned how to read it and play the trombone.

- amistre64

i cant find a good solution to this, not without taking acoustic/music theory

- amistre64

not D3, D# perhaps

- anonymous

sorry afk >< and It's a math problem from math class :P

- amistre64

The perfect 5th below D# is a G#
but i dont know its frequency yet

- anonymous

Huh? >< Might wanna take another gander at the problem it is shooting frequencies no notes there D# and G# are out of my horizon.

- amistre64

http://www.musictheory.net/lessons/31
yeah, apparently the notation like G4 means 4th octave above middle g?

- amistre64

at any rate, i might have a solution strategy
when we double the frequency, we step an octave.
an octave is divided into 12 or 13 half steps .. and perfect and major are just names that i see no bearing on frequenct

- anonymous

LiteLegacy.exe has stopped working: huh?

- amistre64

http://www.musictheory.net/lessons/31

- amistre64

the scale they give is a number off: D3 has the D2 value
1 2 3 4 5 6
0 A 55.000 110.000 220.000 440.000 880.000 1,760.000
1 # 58.270 116.541 233.082 466.164 932.328 1,864.655
2 B 61.735 123.471 246.942 493.883 987.767 1,975.533
3 C 65.406 130.813 261.626 523.251 1,046.502 2,093.005
4 # 69.296 138.591 277.183 554.365 1,108.731 2,217.461
5 D 73.416 146.832 293.665 587.330 1,174.659 2,349.318
6 # 77.782 155.563 311.127 622.254 1,244.508 2,489.016
7 E 82.407 164.814 329.628 659.255 1,318.510 2,637.020
8 F 87.307 174.614 349.228 698.456 1,396.913 2,793.826
9 # 92.499 184.997 369.994 739.989 1,479.978 2,959.955
10 G 97.999 195.998 391.995 783.991 1,567.982 3,135.963
11 # 103.826 207.652 415.305 830.609 1,661.219 3,322.438

- anonymous

AH thank you kindly or that.

- anonymous

the heck.....I might just wing the answers because I am totally confuse

- amistre64

a 5th is 7 half steps ... according to the links
E is the perfect 5th above A, since it is A+7 steps

- amistre64

D-7 gets us to G
so D2 is where we start and we drop to G1

- anonymous

...I am going to get this in Hz units right ?

- amistre64

A4 is 440 (your A5)
half of that is 220, so what is 440+2(220)? this gets us 2 full octaves above it

- anonymous

oh!! Nice algebra there !!

- amistre64

ive got that off, i didnt see the octave right

- amistre64

if we start at 440
440+440 gets us 1 octave, we double the start
2(440) is on octave, then double again
2(2)(440) is 2 octaves above

- amistre64

i see no rhyme or reason to it other than the octaves ... the fifths and whatnots are just from the table

- anonymous

Ah okay Gotcha ^^

- amistre64

for example
A1 = 55, A2=110 for an interval of length 55
55/13 = 4.23... assuming each half step is linear (but its not)
55 + 7(55)/13 = 84.615....
E is a 5th above A, but that table shows E1=82.4, not 84.6
so i got no real recourse for that

- anonymous

0-0 what about the D3 ? (the example kinda confused me)

- amistre64

D3 = 146.8
D2 = 73.4
for an interval length of 73.4
146.8 -7(73.4)/13 = 107.27 , which is no where close to 98

- amistre64

the labeling on the site i got the table from is 1 off
D2, - (7 steps) = G1
G1 has a value of about 98
rowG col1

- amistre64

we can table up percentages ... but all thats doing is reorganizing a table that someone else has written

- anonymous

math must really hate me...I will just wing it on the second one ><

- amistre64

.06
.12
.18
.26
.32
as approximations, the percentages seem to be linear

- anonymous

0-0

- amistre64

I dont know music theory so i cant comment on the verity of it.

- anonymous

lol it's okay :) Thank for your help with everything and sticking with me for an hour.

- amistre64

lets say we start at a freq of 55, the interval of the octave is also 55.
.06 of the interval is a step;
A = 55
A# = 55 + .06(55) = 58.3
G = 58.3(1.06) = 61.8
G#= 61.8(1.06) = 65.5
E= 55(1.06)^7 = 82.7, ball park
E is a perfect 5th above A
--------------------------
if D3 = 146.83, our rate of change is 1-.06 = .94
lets test this out
146.83(.94)^7 = 95.22 which is in the ball park of 98 as far as the options go.

- amistre64

oh well, its fun to play with, but thats about it :) good luck

- anonymous

Thx I passed with a 70 % (good enough)

- amistre64

yay! or at least its worth a cookie? meh, it ok i spose lol

- anonymous

Lmbo, I wish for the cookie.

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