[PD] readsf~ problem with 28-channel 256hz file

[Johanna Nowak]

* kristof lauwers <pd at kristoflauwers.domainepublic.net> [2012-08-07 16:42]:
> At 14:07 2012-08-07, i go bananas wrote:
> 
> >If you only want to playback the data, then the easiest way might
> >be just to change pd's sample rate to 256hz.
> >
> >If that doesn't work, maybe have a look at readsf~ help to see how
> >to manually set playback parameters
> 
> well, i want to use the EEG data as control data for an audio
> signal, so lowering the samplerate is no option..
> the help from readsf~ doesn't say anything about changing the
> samplerate.. (but shouldn't it just read the right samplerate from
> the file? it's a normal .wav file..)
> 
> At 15:17 2012-08-07, Johanna Nowak wrote:
> >
> > have a look at the help-file for the block~ object, which can do
> > up/downsampling in a subpatch.
> 
> i tried running it from a subpatch with a lower samplerate, but that
> didn't change anything..
> 
> > If you have enough ram, you could also load all soundfile data into 28
> > tables, and read from those using tabread4~ or even a message-based
> > tabread followed by a line~.
> 
> i will give that a try. thanks for the suggestion!

Have you tried opening the 256Hz wav file(s) in another application,
such as sox[1], and resampling it there, resulting in a 44.1kHz file?

just an idea

best, Jo
[1] http://sox.sourceforge.net/sox.html

> 
> greetings,
> 
> Kristof
> 
> 
> >On Tuesday, August 7, 2012, kristof lauwers wrote:
> >Hi,
> >
> >I'm trying to play back a rather uncommon file with readsf~. It's
> >3 hours of EEG data, on 28 channels, with a samplerate of only 256
> >hz. At first sight, readsf~  deals well with the 28 channels, but
> >it seems to play it back way too fast.. Is there a way to make rit
> >play back the file at the right speed?
> >I'm using Pd version 0.40.3-extended on windows xp..
> >
> >thanks!
> >
> >Kristof
> >
> >
> >
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