Messages in this thread | | | From | "Opensource [Adam Thomson]" <> | Subject | RE: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver | Date | Fri, 6 Nov 2015 13:17:28 +0000 |
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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.
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