<div class="gmail_quote">On Sun, Jan 29, 2012 at 11:11 PM, Fons Adriaensen <span dir="ltr"><<a href="mailto:fons@linuxaudio.org" target="_blank">fons@linuxaudio.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div></div><div>On Sun, Jan 29, 2012 at 10:43:48PM +0530, Rustom Mody wrote:<br>
<br>
> Thanks to Al Thomson pointer to look at 'normalize' I have found that my<br>
> equipment (just a vanilla sound card) has/introduces some DC offset.<br>
> How to remove it? Why does it come?<br>
<br>
</div></div>How much is 'some' ? Capture or playback ?<br>
<br></blockquote></div><br>Immediate context:<br>Im trying to capture from firefox using the .asoundrc/jack settings shown<br><a href="http://jackaudio.org/routing_alsa">http://jackaudio.org/routing_alsa</a><br>[Track is <a href="http://www.raaga.com/play/?id=183659" target="_blank">http://www.raaga.com/play/?id=183659</a><br>
I would just buy it if it were for sale; its not. You may have to click past an ad]<br><br>However Ive noticed earlier that when I use my (cheap headset) mike to record directly into audacity, this similar DC offset occurs. Since I am no audio pro I did not know what to google for before seeing the tabs in the normalize dialog of audacity.<br>
<br>So if you ask me exactly how much DC offset I dont know how to find out in figures. The audacity track shows it 1/4th to 1/3rd way up. Center is 0.0 top is 1.0 inbetween is 0.5.<br>This is little more than half way between 0 and 0.5.<br>
<br>When I run the audacity normalize tool a certain booming sound is there which is not in the original. So if there is some way of capturing without the offset<br><br>