On Mon, Oct 22, 2007 at 10:17:50AM -0700, william estrada wrote: > Yes, the format is U8, it is a simple recording program to make '.wav' > files. The filtering does work when adjusting the 'silence byte'. It > appears that the device drivers are not consistent with this value? > So I will be adding an option to change the value of the 'silence byte'. > > How do I use the RMS value to remove noise? A URL that I could read? It's probably not worth the effort for 8 bits. What you see is a simple DC offset. Probably the easy approach is to consider a range of values e.g. 0x7E...0x82 as silence. Any value outside the range starts the recording, until you find a long series of samples within the silence range. So the algo would be: If you find a value in the silence range, increment a counter. If the counter reaches a certain value, stop. If you find a value outside the range, start and reset the counter. You could also use a counter to avoid too many false starts. Ciao -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Lascia la spina, cogli la rosa. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
