On Sun, 9 Jan 2011 13:02:39 +0600 IL'dar AKHmetgaleev <akhilman@xxxxxxxxx> wrote: > ÐÐ Sat, 8 Jan 2011 22:42:30 -0800 (PST) > Bill Unruh <unruh@xxxxxxxxxxxxxx> ÐÐÐÐÑÐÐÐ: > > > On Sun, 9 Jan 2011, IL'dar AKHmetgaleev wrote: > > > > > Greetins. > > > > > > I have USB headset which produces a little DC Offset when I'm > > > recording sound. > > > Windows magicaly corrects it even inside virtual machine. > > > > > > How can I remove DC Offset from my microphone input? > > > > Not sure what you mean. Do you mean that there is an electrical > > voltage on that input or that when you record, there is a non-zero > > mean level? If the former, then that is probably to give power to > > electret condenser microphones to run their fets. If the latter, then > > you can always apply a digital filter that takes out ultra low > > frequencies. > > Yes I can apply digital filter if I recording sound. But If I'm using > headset for VoIP chatting? I'm currently using ladspa plugin in > asoundrc. But this solution doesn't work with all applications. > > > > > > > As I know there is a lot cheap hardware which produces DC Offset. > > > > A capacitor removes DC offset. and they are quite cheap. > > Yes. but it's a USB headset. It has USB connector at one side and > microphone at another side. Hacking and putting capacitor into this > hardware not very easy solution. > Why do you think your ADC converts from DC ? I.e. why do you think you have the DC offset in your recording ? Regards, Sergei. ------------------------------------------------------------------------------ Gaining the trust of online customers is vital for the success of any company that requires sensitive data to be transmitted over the Web. Learn how to best implement a security strategy that keeps consumers' information secure and instills the confidence they need to proceed with transactions. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
