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Re: [Discuss-gnuradio] OS X input troubled

From: Jason Uher
Subject: Re: [Discuss-gnuradio] OS X input troubled
Date: Thu, 30 Apr 2009 07:30:41 -0500

> The problem I have is with audio input. Output is working fine (dial_tone.py 
> is wowking), but when I try
> to use audio input, I get:

2009/4/30 Michael Dickens <address@hidden>:
> code; I haven't looked at it or updated it in a long time.  I can't look
> into this issue today, but I will tomorrow (Friday).

If you want to keep messing with this in the meantime, I recall that
there were a few issues getting audio input in gnuradio to work for me
at first with (an earlier version of ) 10.4

First, the 'dumb' problem, make sure voice control is off, apple has
it on by default, and you can turn it off in system

Secondly, there were issues with sample rate.  You specified 96k as
the input sample rate, I'm reasonably sure that I could only get it to
work with lower rates (i.e. <40k) on my MBP C2D (with the very
informative name of 'intel audio device').

Finally, there was an issue where garage band (even when closed) had
'claimed' control over the microphone.  I had to go in and set its
default input device to null.

I'm not sure exactly what you are doing, I was only playing around to
try and get a handle on gr before my usrp got here so I didn't need a
whole lot of functionality, but at least you have something to try in
the meantime.


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