Kessito

I am looking for a way to perform a non-realtime FFT/IFFT, I know how to do the realtime stuff with pfft~ etc. but I want to perform a FFT on a buffer~ wich is not longer than the FFT size. So basically I want to use it for analysing a buffer and I can't see how to do this with the realtime stuff. I've also searched maxobjects.com where I find a lot off realtime stuff, but no offline stuff.

non-realtime-offline-fft-ifft-options

This should be possible with FTM, from IRCAM, although I don't know 

> I am looking for a way to perform a non-realtime FFT/IFFT, I know how

> to do the realtime stuff with pfft~ etc. but I want to perform a FFT

> on a buffer~ wich is not longer than the FFT size. So basically I

> want to use it for analysing a buffer and I can't see how to do this

> with the realtime stuff. I've also searched maxobjects.com where I

> find a lot off realtime stuff, but no offline stuff.

This should be possible with FTM, from IRCAM, although I don't know 
offhand what the maximum FT size is.

Kessito wrote:
> Hi Everybody,
>
> I am looking for a way to perform a non-realtime FFT/IFFT, I know how
> to do the realtime stuff with pfft~ etc. but I want to perform a FFT
> on a buffer~ wich is not longer than the FFT size. So basically I
> want to use it for analysing a buffer and I can't see how to do this
> with the realtime stuff. I've also searched maxobjects.com where I
> find a lot off realtime stuff, but no offline stuff.
>
>

You can use soundhack for this and then read the result with csound~ 

On 10 Jan 2008, at 14:04, Owen Green wrote:

> This should be possible with FTM, from IRCAM, although I don't know 

>> I am looking for a way to perform a non-realtime FFT/IFFT, I know how

>> to do the realtime stuff with pfft~ etc. but I want to perform a FFT

>> on a buffer~ wich is not longer than the FFT size. So basically I

>> want to use it for analysing a buffer and I can't see how to do this

>> with the realtime stuff. I've also searched maxobjects.com where I

>> find a lot off realtime stuff, but no offline stuff.

>> maxmsp mailing list maxmsp@cycling74.com 

You can use soundhack for this and then read the result with csound~  
external.

> Hi Kessito,
>
> This should be possible with FTM, from IRCAM, although I don't know  
> offhand what the maximum FT size is.
>
> -- 
> Owen
>
> Kessito wrote:
>> Hi Everybody,
>> I am looking for a way to perform a non-realtime FFT/IFFT, I know how
>> to do the realtime stuff with pfft~ etc. but I want to perform a FFT
>> on a buffer~ wich is not longer than the FFT size. So basically I
>> want to use it for analysing a buffer and I can't see how to do this
>> with the realtime stuff. I've also searched maxobjects.com where I
>> find a lot off realtime stuff, but no offline stuff.
>>  maxmsp mailing list maxmsp@cycling74.com https://cycling74.com/ 
>> mailman/listinfo/maxmsp
>
>


Is there a reason you can't use the same [pfft~] methods, with 

appropriate modifications, on a buffer instead of the real-time input 

On Jan 10, 2008, at 5:41 AM, Kessito wrote:

> I am looking for a way to perform a non-realtime FFT/IFFT, I know 

> how to do the realtime stuff with pfft~ etc. but I want to perform 

> a FFT on a buffer~ wich is not longer than the FFT size. So 

> basically I want to use it for analysing a buffer and I can't see 

> how to do this with the realtime stuff. I've also searched 

> maxobjects.com where I find a lot off realtime stuff, but no 

Is there a reason you can't use the same [pfft~] methods, with  
appropriate modifications, on a buffer instead of the real-time input  
stream?

>
> Hi Everybody,
>
> I am looking for a way to perform a non-realtime FFT/IFFT, I know  
> how to do the realtime stuff with pfft~ etc. but I want to perform  
> a FFT on a buffer~ wich is not longer than the FFT size. So  
> basically I want to use it for analysing a buffer and I can't see  
> how to do this with the realtime stuff. I've also searched  
> maxobjects.com where I find a lot off realtime stuff, but no  
> offline stuff.

----
Steven M. Miller
Professor, Contemporary Music Program
College of Santa Fe

Home 
SFIFEM 
Atrium Sound Space 
OVOS 
CMP 


> I am looking for a way to perform a non-realtime FFT/IFFT, I know how to do the realtime stuff with pfft~ etc. but I want to perform a FFT on a buffer~ wich is not longer than the FFT size. So basically I want to use it for analysing a buffer and I can't see how to do this with the realtime stuff. I've also searched maxobjects.com where I find a lot off realtime stuff, but no offline stuff. 

there is an external library called vasp (information is here: 

which does non realtime processes on buffers.) threaded and non threaded.

Kessito wrote:
> Hi Everybody,
>
> I am looking for a way to perform a non-realtime FFT/IFFT, I know how to do the realtime stuff with pfft~ etc. but I want to perform a FFT on a buffer~ wich is not longer than the FFT size. So basically I want to use it for analysing a buffer and I can't see how to do this with the realtime stuff. I've also searched maxobjects.com where I find a lot off realtime stuff, but no offline stuff. 
>
> Thanks a lot,
> Kessito

there is an external library called vasp (information is here: 
http://grrrr.org, download is there: http://grrrr.org/ext/beta/max) 
which does non realtime processes on buffers.) threaded and non threaded.
marius.


On 12 Jan 2008, at 01:11, marius schebella wrote:

>> I am looking for a way to perform a non-realtime FFT/IFFT, I know 

>> how to do the realtime stuff with pfft~ etc. but I want to perform 

>> a FFT on a buffer~ wich is not longer than the FFT size. So 

>> basically I want to use it for analysing a buffer and I can't see 

>> how to do this with the realtime stuff. I've also searched 

>> maxobjects.com where I find a lot off realtime stuff, but no 

> there is an external library called vasp (information is here: 

> which does non realtime processes on buffers.) threaded and non 

also i have an external that does fft/ifft on buffers in non realtime 

> Kessito wrote:
>> Hi Everybody,
>> I am looking for a way to perform a non-realtime FFT/IFFT, I know  
>> how to do the realtime stuff with pfft~ etc. but I want to perform  
>> a FFT on a buffer~ wich is not longer than the FFT size. So  
>> basically I want to use it for analysing a buffer and I can't see  
>> how to do this with the realtime stuff. I've also searched  
>> maxobjects.com where I find a lot off realtime stuff, but no  
>> offline stuff. Thanks a lot,
>> Kessito
>
> there is an external library called vasp (information is here:  
> http://grrrr.org, download is there: http://grrrr.org/ext/beta/max)  
> which does non realtime processes on buffers.) threaded and non  
> threaded.
> marius.

also i have an external that does fft/ifft on buffers in non realtime  
that i would be happy to share.
osx only.
vb


since vasp seems to be completely undocumented for max/msp right now, I'm sure a lot of people could make good use of your object, Volker. 

Would you consider putting a link to it on maxobjects.com?

since vasp seems to be completely undocumented for max/msp right now, I'm sure a lot of people could make good use of your object, Volker. 
Would you consider putting a link to it on maxobjects.com?

Thank you all for the replies, I will check out the vasp and ftm options. The reasons why I can't do it with fft~/pfft~ are:

- It seems impossible to get a proper synchronisation between the buffer~ and the fft~ object (you can't make a zero delay feedback)

-For this project I need FFT sizes of approx. 4 million points, to my knowledge the fft~ object has a maximum size of 16k.

Thank you all for the replies, I will check out the vasp and ftm options. The reasons why I can't do it with fft~/pfft~ are:
- It seems impossible to get a proper synchronisation between the buffer~ and the fft~ object (you can't make a zero delay feedback)

-For this project I need FFT sizes of approx. 4 million points, to my knowledge the fft~ object has a maximum size of 16k.


On 14 Jan 2008, at 23:38, Klaas-Jan Govaart wrote:

> since vasp seems to be completely undocumented for max/msp right 

> now, I'm sure a lot of people could make good use of your object, 

> Would you consider putting a link to it on maxobjects.com?

i wonder how well this works for others anyway.

i've hesitated to put my stuff on maxobjects.com, cause most of the 

objects were made for a specific project or simply for

proof of concept and therefore haven't been tested very carefully, yet.

but since this state might not change "in the near future", i might 

aswell just make them available as they are, and let

everyone else decide what is useful and what not.

will probably find some time tonight to upload. stay tuned.

>
> since vasp seems to be completely undocumented for max/msp right  
> now, I'm sure a lot of people could make good use of your object,  
> Volker.
> Would you consider putting a link to it on maxobjects.com?

ok -
i wonder how well this works for others anyway.
i've hesitated to put my stuff on maxobjects.com, cause most of the  
objects were made for a specific project or simply for
proof of concept and therefore haven't been tested very carefully, yet.
but since this state might not change "in the near future", i might  
aswell just make them available as they are, and let
everyone else decide what is useful and what not.

will probably find some time tonight to upload. stay tuned.
volker.


No, I'm afraid that I really do need this 0,01 Hz resolution, this is because I'm doing some very low-frequency analysing according to 

type 0 (lab) ISO specifications... I know that I can just lower the sample rate but I need the whole spectrum, and I could do split frames (different sample rates for different parts of the spectrum) but then things might get dodgy when I FFTconvolve stuff.

-record log freq sweep (couple of minutes)

-convolve with inverse sweep ->this gives the impulse response

btw, maybe someone has actually used vasp, and could tell just how to perform a FFT/IFFT with it?

No, I'm afraid that I really do need this 0,01 Hz resolution, this is because I'm doing some very low-frequency analysing according to  
type 0 (lab) ISO specifications... I know that I can just lower the sample rate but I need the whole spectrum, and I could do split frames (different sample rates for different parts of the spectrum) but then things might get dodgy when I FFTconvolve stuff.

What I actually need to do is:
-record log freq sweep (couple of minutes)
-convolve with inverse sweep ->this gives the impulse response
-filter with passband filters
-make energy decay curves

btw, maybe someone has actually used vasp, and could tell just how to perform a FFT/IFFT with it?


http://www.notam02.no/notam02/prod-prg-mammut-e.html

> No, I'm afraid that I really do need this 0,01 Hz resolution, this is

> because I'm doing some very low-frequency analysing according to type

> 0 (lab) ISO specifications... I know that I can just lower the sample

> rate but I need the whole spectrum, and I could do split frames

> (different sample rates for different parts of the spectrum) but then

> things might get dodgy when I FFTconvolve stuff.

> What I actually need to do is: -record log freq sweep (couple of

> minutes) -convolve with inverse sweep ->this gives the impulse

> response -filter with passband filters -make energy decay curves

> btw, maybe someone has actually used vasp, and could tell just how to

You might find this helpful:
http://www.notam02.no/notam02/prod-prg-mammut-e.html

Kessito wrote:
> No, I'm afraid that I really do need this 0,01 Hz resolution, this is
> because I'm doing some very low-frequency analysing according to type
> 0 (lab) ISO specifications... I know that I can just lower the sample
> rate but I need the whole spectrum, and I could do split frames
> (different sample rates for different parts of the spectrum) but then
> things might get dodgy when I FFTconvolve stuff.
>
> What I actually need to do is: -record log freq sweep (couple of
> minutes) -convolve with inverse sweep ->this gives the impulse
> response -filter with passband filters -make energy decay curves
>
> btw, maybe someone has actually used vasp, and could tell just how to
> perform a FFT/IFFT with it? 
>
>

Non - realtime (offline) FFT-IFFT options?