hi,

i 'm not very good in math and i can't figure how to do a small piece of csound code (UDO?) who help me to give frequency in place of a transposition ratio to a mincer opcode (and in general for all the opcode who need transposition ratio).

It will be useful for me for many things, tuning, Blue tuning parameter processing, algorithmic generation etc ....



thanks


stf


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also, i imagined it is something with root 12th of 2 .......

stf

Le 10 avr. 2013 à 16:17, Stéphane_Boussuge <stfboussuge@gmail.com> a écrit :

Thank you Justin, 

i will explore that ASAP.

best

stf

Le 10 avr. 2013 à 16:05, Justin Smith <noisesmith@gmail.com> a écrit :

frequency / base = transposition

alternately:

base * transposition = frequency

ibase = 440 ; recording of a 440 hz note

itranpos = 1000 / ibase ; the transposition factor to make a 1khz output

I guess you could do a udo

opcode trapspos i,ii

ihz, ibase xin

               xout ihz/ibase

endop

this only makes sense when the input sound is pitched and you know the pitch, obviously

On Wed, Apr 10, 2013 at 2:08 AM, Stéphane_Boussuge <stfboussuge@gmail.com> wrote:

hi,

i 'm not very good in math and i can't figure how to do a small piece of csound code (UDO?) who help me to give frequency in place of a transposition ratio to a mincer opcode (and in general for all the opcode who need transposition ratio).

It will be useful for me for many things, tuning, Blue tuning parameter processing, algorithmic generation etc ....



thanks


stf


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Darn you Richard, I've just spent the last 5 minutes trying to memorise these!

On 10 April 2013 16:27, Richard Dobson <richarddobson@blueyonder.co.uk> wrote:
> On 10/04/2013 15:32, Justin Smith wrote:
>>
>> oh, did you want semitones of transposition and not transposition to a
>> particular hz?
>>
>> (2^(1/12))^semitones translates from a number of semitones to a
>> transposition
>>
>> (ie. (2^(1/12))^7 is the transposition factor to go up an equal tempered
>> fifth, (2^(1/12))^-7 down a fifth etc.)
>>
>> I would usually just define isemi=2^(1/12) and then calculate
>> isemi^semitones to get the transposition needed
>>
>>
>
> That's a number well worth memorizing for musicians, just as mathematicians
> know the first digits of Pi or e. So in this case: 1.059463094. Something to
> impress/bore people with at parties, when all else fails!
>
> Richard Dobson
>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
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> csound"
>


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Darn you Richard, I've just spent the last 5 minutes trying to memorise these!


On 10 April 2013 16:27, Richard Dobson <richarddobson@blueyonder.co.uk> wrote:
> On 10/04/2013 15:32, Justin Smith wrote:
>>
>> oh, did you want semitones of transposition and not transposition to a
>> particular hz?
>>
>> (2^(1/12))^semitones translates from a number of semitones to a
>> transposition
>>
>> (ie. (2^(1/12))^7 is the transposition factor to go up an equal tempered
>> fifth, (2^(1/12))^-7 down a fifth etc.)
>>
>> I would usually just define isemi=2^(1/12) and then calculate
>> isemi^semitones to get the transposition needed
>>
>>
>
> That's a number well worth memorizing for musicians, just as mathematicians
> know the first digits of Pi or e. So in this case: 1.059463094. Something to
> impress/bore people with at parties, when all else fails!
>
> Richard Dobson
>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>


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on 2013-04-10 at 18:34 Oeyvind Brandtsegg wrote:

> The part after 1.059 is better for that. Most of them think the first few
> numbers are rather lame...

yeah, i guess that's why they always give me the cold shower...

perhaps that's also why i always sing my intervals a bit off.

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On 10/04/2013 16:40, Mark Brophy wrote:

Albert Einstein couldn't remember his 7 digit phone number so it might
be prudent for musicians to memorize only the first 6 digits of the
twelfth root of two or to download an open source spreadsheet like
LibreOffice.

If you make it just 1.0594631, it gives quite a nice pattern on a numeric keypad...

Richard Dobson



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