Re: audio record

[Ronan Scaife]

Dear all,

2 years ago, I was experimenting with Scilab to create experiments for 
sound recording/playback (simultaneous and synchronisable.)

I discovered pawavplay, a Matlab user-contributed PortAudio-based 
toolbox, and using Scilab's MEX interface emulation, I was able to 
rebuild this for Scilab (v4.1.2):

        <http://elm.eeng.dcu.ie/~scaifer/pa_wavplay/index.html>

I have no reason to doubt that the same could be done for Octave.

There is also playrec, a much more sophisticated package, which has 
already been ported to Octave:

        <http://www.playrec.co.uk/>

BTW, I love (and currently use) octave, but Scilab seemed to offer an 
easier way to build a GUI at the time.

Best Wishes,

On 22/07/2010 23:27, address@hidden wrote:
> The hardware probably does not support anything but a few 'given' values.
>
> You should be able to get 44100, but won't get 44000
>
> There's another way to do what you want.  Go directly to your sound card
> and directly record.
>
> I did this on WinXP system using the ASIO interface from Steinberg and
> wrote special C++ code to record.  and play.
>
> The latency is controllable, but is set default at around 50 ms.  I wanted
> better resolution so I run the card 24 bits at the maximum rate of 192000
> S/s. Then using octave you can do anything you want with the data.
>
> Regards,
>
>
> "un speakable"<address@hidden>  Thu, July 22, 2010 12:06
> pm wrote:
> > Hi all,
> >
> > I have a question to the record function in octave. Everything is working
> > very fine, I made my own audio analysis tool. But I have one problem with
> > the recording from the microphone.
> > x=record(time,samplingrate);
> > I can´t change the sampling rate. When I use some other value for the
> > sampling rate than 8000 then the time differ from the chosen value, but
> > the
> > sampling rate is still 8000. For example:
> > x=record(1,44000);
> > Here the recording time is 5,8 sec it´s close to the value 44000/8000 ->
> > sampling rate is still 8000 but recording time excedes the chosen 1 sec.
> >
> > Do you have a solution for this problem or can you help me how I can
> > change
> > the sampling rate?
> >
> > It woult be great, when you could help me!
> > Thank you very much for your help!!
> >
> > Regards,
> > Tobias


--
== Dr. Ronan Scaife =============== address@hidden ==========
RINCE (Research Inst. for Networks and Communications Engineering),
School of Elec Eng, Dublin City University, Dublin 9,  IRELAND.
http://www.eeng.dcu.ie/~scaifer/ phone (office): +353-1-700-5434
phone (lab): +353-1-700-7623 fax: +353-1-700-5508
====================================================================