Forums > MaxMSP

polyphony varies amplitude


wak
January 15, 2006 | 3:03 am

I am working on a polyphonic synthesizer and I am wondering if there is
a generally accepted way (method and degree) for automatically
lessening the output volume as the number of sounding voices increases
in order to avoid distortion.

Thank you, community, for your help; and thank you, Cycling ’74, for
the new web site and forms.

-ian



wak
January 17, 2006 | 1:11 am

If I understand what you’re proposing, the voice number output by poly
does not necessarily = the number of voices. However, I have worked up
a patch that does indeed divide the the amplitude by the number of
voices (derived from the busymap thru iter which may be a round about
way for all I know)).

This curve 1 1/2 1/3 1/4 . . . sounds too drastic to me though. Before
I get into experimenting with different curves, I thought that I would
see if there was a standard that I could Simply adhere too.

I will try out normalize~, it hadn’t occurred to me.

thank you,

-ian


January 17, 2006 | 9:18 am

Try sqrt(1), sqrt(1/2), sqrt(1/3)…

On around Jan 17, 2006, at 2:11, walbers said something like:
> This curve 1 1/2 1/3 1/4 . . . sounds too drastic to me though. Before
> I get into experimenting with different curves, I thought that I would
> see if there was a standard that I could Simply adhere too.
>
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pcastine@gmx.net |
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January 17, 2006 | 10:58 am

that’s a better andwer, but tim place’s [tap.elixir~] is very nice.



wak
January 28, 2006 | 12:27 am

i have worked up a method that iterates and counts a busymap from
poly~. i am happy with the sqrt(1) sqrt(1/2) curve but since it’s not
at audio rate, it is not near as smooth as tap.elixir~. i haven’t been
able to think of another method of determining the # of voices sounding
in a polly~. i still haven’t tried normalize~, which may be my best
bet.

-ian


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