math problem

joffo78 · Unread post by **joffo78** » 13 Apr 2011, 18:20

Hi
Nobody on the french forum to help to resolve my problem ?
I'll try to explain it here.
I'd like to convert pitch data in time data.
i can modify the pitch with positive negative or 0 values (0 mean no pitch so 100% of the duration of my sample)
I'd like to deduce the operator which permit me to calculate the duration of my sample when i modify the speed.
thank you.
Jof

nay-seven · Unread post by **nay-seven** » 13 Apr 2011, 21:47

sorry, was dreaming during maths lessons..
any maths guru for joffo..?

23fx23 · Unread post by **23fx23** » 13 Apr 2011, 22:43

mmm speed double and length reduce of half when pitched an octave (+12),

so if not wrong should be len= original len / (pitch/6) maybe.

bsork · Unread post by **bsork** » 13 Apr 2011, 22:44

I was sure I had brought up this issue once, so I did a search and found this thread from 2006. You'll find the formula there.

joffo78 · Unread post by **joffo78** » 14 Apr 2011, 07:16

ok thank you
this formul : original_length / 2^(pitch/12) = shifted_length
seems interest me but i don't know what the symbol ^ means...
and how can i apply this formule in usine ?

caco · Unread post by **caco** » 14 Apr 2011, 08:43

^=power.

It's in the maths section of the browser as A ^ B (power)

joffo78 · Unread post by **joffo78** » 14 Apr 2011, 10:53

thank you

joffo78 · Unread post by **joffo78** » 14 Apr 2011, 11:06

So i tried to traduct this : 300 / 2^(7/12) = 200.225978126 in usine language without success

may i did some mistake ?

nay-seven · Unread post by **nay-seven** » 14 Apr 2011, 11:23

here it is : ( when there's parenthesis...)

YouTube · Unread post by **senso** » 14 Apr 2011, 11:29

@bsork: you're the Usine's encyclopedia!

joffo78 · Unread post by **joffo78** » 14 Apr 2011, 12:01

thank you you're masters !

joffo78 · Unread post by **joffo78** » 15 Apr 2011, 09:24

So Nay you're not so bad in math.No more than me !

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math problem

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