Re: Playing an array as sound and recording it's output in parallel

[Macy]

I use Steinberg's ASIO interface [free] for a LOT of power on a sound card.

http://www.steinberg.net/...

--- address@hidden wrote:

From: Rick T <address@hidden>
To: William Krekeler <address@hidden>
Cc: "address@hidden" <address@hidden>
Subject: Re: Playing an array as sound and recording it's output in parallel
Date: Fri, 28 Oct 2011 05:02:54 -1000

Wow thanks I do have a full duplex sound card and I'm using ubuntu 10.04
64bit.  This looks like what I'm looking for hopefully it will allow me to
create my own test signals to use.
Thanks again

On Fri, Oct 28, 2011 at 3:21 AM, William Krekeler <
address@hidden> wrote:

>  ** **
>
> ** **
>
> *From:* address@hidden [mailto:
> address@hidden *On Behalf Of *Rick T
> *Sent:* Thursday, October 27, 2011 5:17 PM
> *To:* address@hidden
> *Subject:* Playing an array as sound and recording it's output in parallel
> ****
>
> ** **
>
> Greetings All****
>
> ** **
>
> I know octave can play arrays as sound but, I was wondering if Octave can
> do this.  I would like to cycle through a range of frequencies and have
> octave play them using the speaker out on my computer, and have octave also
> record the sound using the mic input to get the max value.  I'm trying to
> automate a way to have octave cycle through frequencies and record the
> data received so I can go back latter and look at the resonant frequencies.
>  Can Octave do this type of operation in parallel?****
>
> ** **
>
> Example:****
>
> clear all****
>
> t=linspace(0,1,44100);****
>
> A = 1; % amplitude****
>
> Fs = 44100****
>
> ** **
>
> for ii=1:1:10****
>
>      freq=ii; %how many in 1 sec****
>
>      T = 1/freq; % period of the signal****
>
>      vertoffset=0.5;****
>
>      % square****
>
>      square = mod(t * A / T, A) > A / 2;****
>
>      square = square - vertoffset;****
>
>      sound(square,Fs);****
>
> end;****
>
> ** **
>
> ** **
>
> Playing sound and recording sound at the same time requires a full-duplex
> soundcard. This is not the default configuration so from a hardware
> standpoint your computer may not be able to do this. Next you need a
> low-latency driver like ASIO, there are others I just can't remember then
> right now. For code look at MATAA (Mat's Audio Analyzer) for examples of how
> to input and output sound at the same time along with analysis.****
>
> ** **
>
> http://sourceforge.net/projects/mataa/****
>
> http://www.audioroot.net/index.html?analysis/mataa.html****
>
> ** **
>
> Hope that helps.****
>
> ** **
>
> William Krekeler****
>
> ** **
>
> ** **
>


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