2010/2/16 Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> > On Tue, Feb 16, 2010 at 03:32:01PM +0100, Lennart Poettering wrote: > > On Tue, 16.02.10 09:24, Jaroslav Kysela (perex@xxxxxxxx) wrote: > > > > Line: 0dB..47.81dB # seems correct -47.81dB..0dB > > > Line Capture: -0.18dB..23.81dB # seems correct > > > -17.81dB..6.18dB > > > Hmm, how did you choose where to put 0dB? > > The Line one looks like someone got attenuation and gain confused, which > is a fairly common mistake for people to make when copying information > from one place to another. Possibly a similar thing going on with the > Line Capture control, plus a fixed 6dB gain (which may well be a > separate amp...). > Correct me if I am wrong 0dB point is needed when you recording from line-in by connected loopback cable to line out. The captured signal is supposed to be the same as the playback signal when you set both playback volume and capture volume to 0dB , if you set playback volume over 0dB , clipping occur in the captured signal , if the playback volume is less than 0dB , captured signal will be less than the playback signal. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
