On November 6, 2015 11:55, Mark Brown wrote: > > > > I can envisage in a system you may want to choose which capture channels can > > > > trigger level detection (if any), and this may change depending on the use-case > > > > at the time, so having it as a control makes sense to me. > > > > What is a "capture channel" here? > > > Input filters 1L/R and 2L/R, which are fed from either Mic1(ADC1) or DMic1L/R > > and Mic2(ADC2) or DMic2L/R. > > Hang on, is this just recording a DC value with the ADC and then looking > at that? The RMS of the Mic signal is taken and compared to the trigger level set. If it's above that level then an IRQ is raised. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
