[Bradford] Convert wave amplitude into a float

[John R. Hudson]

Thanks for all the suggestions which I will pass on if they haven't
joined the mailing list yet. Because they want to do it continuously,
reading the Alsa PCM device seems the most likely route. But maybe one
of the other options will be more useful for them once they investigate
them.

However, thanks for the suggestion about how to export from Audacity as
that will enable them to use the data they have already collected to
develop the software before they need to apply to an actual stream.

John
--
On Thu, 2014-03-20 at 20:25 +0000, David Spencer wrote:
> What they *really* want to do is probably some kind of realtime signal
> processing... which is not what Audacity is for (it's an editor).
> They should probably be looking at reading the Alsa pcm device
> directly (e.g. from Python); I bet that's what is pencilled in to
> consume these hypothetical floats... either that, or the hypothetical
> float-consumer needs to read an arbitrary well-understood audio file
> container (e.g. WAV) using a library routine. Once the ints are in a
> program, It's not rocket science to convert ints to floats prior to
> feeding them to whatever other library routines are processing the
> data (fft or whatever).
> 
> The audacity question as posed just sounds like they caught the first
> bus that came along :-)
> 
> -D.
> 
> 
> On 20 March 2014 17:46, John R. Hudson <j.r.hudson at virginmedia.com> wrote:
> > Hi
> >
> > I popped in to see Paul Cannon this afternoon and they had just hit a
> > problem - how to convert a wave amplitude as displayed in Audacity into
> > a float which can be fed into another program.
> >
> > There is no obvious way in which to do this from Audacity. So it may
> > involve using different software.
> >
> > Any thoughts very welcome.
> >
> > John
> > --
> >
> >
> >
> > _______________________________________________
> > Bradford mailing list
> > Bradford at mailman.lug.org.uk
> > https://mailman.lug.org.uk/mailman/listinfo/bradford
> 
> _______________________________________________
> Bradford mailing list
> Bradford at mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bradford