<div dir="ltr">The Speex sample rate converter has problems it appears and consumes and inordinate amount of CPU upwards of 57% when converting from 44.1 to 48 and it still sounds bad. Even with the Audacity generated 300Hz tone at 44.1 the quality does not improve. If I suspend PulseAudio 4.0 and play with straight ALSA, all of the problematic wave files at 44.1 play beautifully with little burden on the CPU. I have tried the 'tsched=0' recommendation on the udev module load line and still get the same poor quality. I use PulseAudio primarily for echo cancellation during video conferencing for which it performs beautifully. Is there a way to bypass the mixing/resampling in PulseAudio and let ALSA perform these functions?<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 25, 2013 at 12:03 AM, Robert Krakora <span dir="ltr"><<a href="mailto:rob.krakora@messagenetsystems.com" target="_blank">rob.krakora@messagenetsystems.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Peter,<div><br></div><div>If I convert all four files, which sent you, to 48K then they all play fine via PulseAudio 4.0 (no motor boating). The frequency spectrum of the 300Hz tone at 44.1K looked a lot different from the 300Hz tone generated by Audacity at 44.1K. I agree that the tone is not perfect. However, the other three files also play poorly on PulseAudio 4.0, but play fine on ALSA 1.0.25.</div>
<div><br></div><div>Best Regards,</div><div><br></div><div>Rob</div><div><br></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jun 24, 2013 at 8:26 PM, Robert Krakora <span dir="ltr"><<a href="mailto:rob.krakora@messagenetsystems.com" target="_blank">rob.krakora@messagenetsystems.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi Peter,<br><br></div><div>Thanks, I suspect the resampling as well. I will take a look at the wave file with audacity and generate a pure 300 Hz tone. Thank you for your time.<br>
<br></div><div>Best Regards,<br>
<br></div><div>Rob<br></div></div><div class="gmail_extra"><div><div><br><br><div class="gmail_quote">On Mon, Jun 24, 2013 at 7:23 PM, Peter Meerwald <span dir="ltr"><<a href="mailto:pmeerw@pmeerw.net" target="_blank">pmeerw@pmeerw.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><br>
> I just provided the files to you via YouSendIt. You should be receiving an<br>
> e-mail with a link to them. Thanks in advance for your help.<br>
<br>
</div>the mysterious 300HZ.wav is not a pure 300Hz tone;<br>
it plays distorted (on ALSA and PA) because the signal is distorted<br>
<br>
when you look at it in Audacity (Analyze -> Plot Spectrum) you see plenty<br>
of frequency components besides 300Hz; you can generate a pure 300Hz tone<br>
using Generate -> Tone and compare<br>
<br>
I do not know why ALSA and PA sounds differently for you, it might be<br>
resampling<br>
<br>
regards, p.<br>
<div><div><br>
--<br>
<br>
Peter Meerwald<br>
<a href="tel:%2B43-664-2444418" value="+436642444418" target="_blank">+43-664-2444418</a> (mobile)<br>
</div></div></blockquote></div><br><br clear="all"><br></div></div><div>-- <br><font color="#888888"><font color="blue">Rob Krakora<br>
MessageNet Systems
<br>
101 East Carmel Dr. Suite 105
<br>
Carmel, IN 46032
<br>
<a value="+13175661677">(317)566-1677</a></font></font><font color="#888888"><font color="blue"> Ext 212<br>
<a value="+13176630808">(317)663-0808</a> Fax
</font></font>
</div></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><font color="#888888"><font color="blue">Rob Krakora<br>
MessageNet Systems
<br>
101 East Carmel Dr. Suite 105
<br>
Carmel, IN 46032
<br>
<a value="+13175661677">(317)566-1677</a></font></font><font color="#888888"><font color="blue"> Ext 212<br>
<a value="+13176630808">(317)663-0808</a> Fax
</font></font>
</div>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><font color="#888888"><font color="blue">Rob Krakora<br>
MessageNet Systems
<br>
101 East Carmel Dr. Suite 105
<br>
Carmel, IN 46032
<br>
<a value="+13175661677">(317)566-1677</a></font></font><font color="#888888"><font color="blue"> Ext 212<br>
<a value="+13176630808">(317)663-0808</a> Fax
</font></font>
</div>