Le Mon, 25 Jun 2012 08:34:06 -0400, Jerry Geis <geisj@xxxxxxxxxxxxxxx> a écrit : > We are using a USB webcam with integrated USB mic. > When we use the USB microphone the volume level is really good > and we dont have to be right up to the micrphone, we can be some > distance away and still have good level audio. > Problem is over time we get feedback that keeps building up and > getting louder and louder. > > If I change that and use an analog microphone I dont get the feedback > but I have to be right up to the analog mic to get any volume level > at all - which is not desirable either. > > Is there anyway to eliminate the audio feedback I am seeing using the > USB microphone? The best things to do would be to use something like a dbx, a feedback suppressor. The problem is than they are expensive pieces of hardware. The principle is simple: above a given (adjustable) input level, you get an output level with a gain of 1, and under this given input level, you get a gain (adjustable) < 1. That way, the feedback will never begin, so it will never get the opportunity to become louder and louder. The dbx are mostly used to suppress feedback on stages. It should be very easy to implement such dbx as a software effect, but I don't know if something like that already exist for linux. Ciao, Dominique > > Thanks, > > Jerry > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user -- "We have the heroes we deserve." ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
