On Thu, 23 Nov 2017, Mark Brown wrote: > > In my case the codec is only a couple of years old, so I'd say it > > qualifies as 'modern'. There's a table in the data sheet describing the > > Wow, people are still designing new VMID based CODECs - what is this one? In this case it's the AK4637. From the data sheet it looks to be from 2015. I know there are codecs that do not need their inputs/outputs (internally) biased to a VMID, but have a 0V bias level using an internal charge-pump design to generate the required internal negative voltages, if that is what you're thinking of. One disadvantage from a cost perspective is the external capacitors needed for the charge pump to operate, and the design in which this one is used is extermely cost optimized. > > During which time period is the digital mute enabled? From the first > > stream startup until everything is up and running? > > It should be enabled at all times that we're not actively playing > anything. Ok. So it really would be the last callback made (with mute = off) to the codec driver once everything else has been set up then? /Ricard -- Ricard Wolf Wanderlöf ricardw(at)axis.com Axis Communications AB, Lund, Sweden www.axis.com Phone +46 46 272 2016 Fax +46 46 13 61 30 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
