barry threw

In many example patches, like the transposition playground, I see a 

It is an expr with the following formula... ((440. * exp(.057762265 * 

$f1))* 0.002273) that serves the purpose of turning pitch changes into 

The issue is that multiplying by 0.002273 is the same as dividing by 

440. so you end up multiplying and then dividing by 440.

In the phase vocoder example by Dudas and Cort on the c74 site, this 

same patcher is used, but its even more explicit:

expr ((440. * exp(.057762265 * $f1))/ 440.)

Now, Les and Richard are two gentlemen that history tells me don't do 

things for no reason. However, I can't figure out why on earth this 

formula multiplies and then divides by 440. Taking those two 

statements out seems to yield the same results.

In many example patches, like the transposition playground, I see a  
sub-patcher called "transratio".

It is an expr with the following formula... ((440. * exp(.057762265 *  
$f1))* 0.002273) that serves the purpose of turning pitch changes into  
transposition multipliers.

The issue is that multiplying by 0.002273 is the same as dividing by  
440. so you end up multiplying and then dividing by 440.

In the phase vocoder example by Dudas and Cort on the c74 site, this  
same patcher is used, but its even more explicit:
expr ((440. * exp(.057762265 * $f1))/ 440.)

Now, Les and Richard are two gentlemen that history tells me don't do  
things for no reason. However, I can't figure out why on earth this  
formula multiplies and then divides by 440. Taking those two  
statements out seems to yield the same results.

San Francisco, CA
Work: 857-544-3967
Email: bthrew (at) gmail (dot) com
Web: www.barrythrew.com


transratio-question

multiplication is less expensive computing, than multiplication. it's mentioned somewhere in the tutorials.

multiplication is less expensive computing, than multiplication. it's mentioned somewhere in the tutorials.
jrp


While true, you are missing the forrest. When you multiply and then 

I'm tending to think its just a "typo", but it's strange to me that it 

appeared in two separate patches...I'm just making sure I'm not crazy.

On Nov 12, 2008, at 10:20 PM, jayrope wrote:

> it seems, that multiplication is less expensive computing, than 

> multiplication. it's mentioned somewhere in the tutorials.

While true, you are missing the forrest. When you multiply and then  
divide by the same thing it cancels out.

I'm tending to think its just a "typo", but it's strange to me that it  
appeared in two separate patches...I'm just making sure I'm not crazy.

> it seems, that multiplication is less expensive computing, than  
> multiplication. it's mentioned somewhere in the tutorials.
> jrp
> --
> ---
> fiction-induced heat
> on too many websites to name

Man, how i miss the forrest, spending way too much time in the city centre.

The self-canceling 440.0*0.002273 is removed in Max 5.

< & Xoaz are great Max developers, but even the best of us does something unnecessary once in a while. The technical Latin term is "poopus cranialus"

The only reason to use this number in a pitch related formula would be as the "A=440" (or 436, or 442 etc) reference pitch, right?

I use this for calculating transposition ratios.

the 12 can be replaced with another number for different equal temperaments.

I use this for calculating transposition ratios.
[expr pow(2,($f1/12))]

I have done that as well, and it works. Simplifying the world never 

hurts. No problem for me, and never expect the gurus to find always the 

shortest path. They do mostly though and that's fine...

barry threw schrieb:
> Taking those two statements 
> out seems to yield the same results.

I have done that as well, and it works. Simplifying the world never 
hurts. No problem for me, and never expect the gurus to find always the 
shortest path. They do mostly though and that's fine...

-- 
Stefan Tiedje------------x-------
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transratio question