Forums > MaxMSP

how to track different frequencies?

September 1, 2008 | 2:09 pm

hi there,

i know something about the envelop follower and on how to create a threshold system that gives a bang when the sound reaches a certain amplitude, but!
i don’t know how to extrapolate from an audio input and map ranges of frequencies such as hi, low , mid-hi and so on…
is anybody here that can help me with some tips?

thanx

fede


September 1, 2008 | 2:26 pm

The really great thing about Max 5 is that
you can search for information from within
the application. So, why not try it out? See
what you can find out about the cross~ or the
fffb~ objects.

You can do this searching *before* you post
questions, too. :-)

The procedure will be a bit different for
Max 4, but the object names remain.


September 17, 2008 | 10:22 am

fuzzz schrieb:
> i know something about the envelop follower and on how to create a
> threshold system that gives a bang when the sound reaches a certain
> amplitude, but! i don’t know how to extrapolate from an audio input
> and map ranges of frequencies such as hi, low , mid-hi and so on…
> is anybody here that can help me with some tips?

If its about frequency bands, just split your signal with filters and
then apply your envelope followers afterwards…

Stefan


Stefan Tiedje————x——-
–_____———–|————–
–(_|_ —-|—–|—–()——-
– _|_)—-|—–()————–
———-()——–www.ccmix.com


September 17, 2008 | 12:59 pm

I’m not sure what you’re asking. Do you want to detect the amplitude in
different frequency ranges? (in which case as Stefan mentioned use filters).
Or are you after fundamental frequency (pitch) or partial detection? I use
fiddle~ for that.

Worth remembering that perceived loudness is not necessarily directly
related to the overall amplitude of a signal but is frequency dependant. The
higher frequencies increase in amplitude as natural loudness of an
instrument increases. The range 1000-4000 Hertz is of crucial importance.

Best
Peiman

2008/9/17 Stefan Tiedje

> fuzzz schrieb:
>
>> i know something about the envelop follower and on how to create a
>> threshold system that gives a bang when the sound reaches a certain
>> amplitude, but! i don’t know how to extrapolate from an audio input
>> and map ranges of frequencies such as hi, low , mid-hi and so on… is
>> anybody here that can help me with some tips?
>>
>
> If its about frequency bands, just split your signal with filters and then
> apply your envelope followers afterwards…
>
> Stefan
>
> –
> Stefan Tiedje————x——-
> –_____———–|————–
> –(_|_ —-|—–|—–()——-
> — _|_)—-|—–()————–
> ———-()——–www.ccmix.com
>
>
>


September 20, 2008 | 5:49 pm

thanx to all!
now i got all the tips i needed


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