FW: [Nyquist-users] Re: Question about maximum table size

[<dav...@sy...>]

Thanks=2E I realize that for some people (rather, some machines), 1 millio=
n
samples might be too large, resulting in a crash, while for others,=20
100,000 might be too small=2E I just wanted some confirmation that there
was a contradiction between the documentation and the actual limit, or
if not, then help in clearing up my misunderstanding=2E

Since I'm just learning how to do things in Nyquist, it's not important=2E=

But maybe in some future release, the table size could be specified as=20
a command-line parameter, rather than hard-coded in an "include" file=2E
Then users could specify whatever is appropriate for their hardware
(although it could default to 100,000 samples)=2E

Thanks for your help=2E

David=2E

Original Message:
-----------------
From: Roger B=2E Dannenberg rbd@cs=2Ecmu=2Eedu
Date: Wed, 16 Mar 2005 15:40:59 -0500
To: nyquist-users@lists=2Esourceforge=2Enet
Subject: [Nyquist-users] Re: Question about maximum table size


Yes, there's a bug either in the documentation or the code: the table size=

limit is 100K samples, which is 400KB=2E The table size limit is a tradeof=
f
between giving users the freedom to do what they want and keeping Nyquist
alive=2E Before there was a limit, users would complain that Nyquist crash=
ed
for no apparent reason=2E The reason was that Nyquist was trying to alloca=
te
huge tables=2E In almost all cases, there was a better way to do things=2E=
 With
convolution, I think you can break the convolution up into two or more
parts, perform them separately, and then shift and sum the results togethe=
r
to get the correct result=2E I realize this is easy to say and somewhat
painful to code and test=2E And if you're going to allocate a bunch of big=

tables, why not just increase the tables size? A 4MB memory allocation isn=
't
so much on most modern machines=2E But is that enough? What should the lim=
it
be? (Also, Nyquist doesn't do fast convolution, so the time is proportiona=
l
to M*N where M and N are the lengths of the two sounds to be convolved=2E)=


I guess the thing to do is increase the max size to 1M and put in some err=
or
reporting in case the allocation fails so when it does the user gets a
meaningful error report=2E I'll work on in=2E

Meanwhile, have you tried the convolution at 22kHz? 88K samples (4 seconds=

at 22kHz) should fit into the current 100K sample limit=2E





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