On Tue, 12 May 2009 16:16:08 +0300 Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > On Tuesday 12 May 2009 15:21:55 ext Jarkko Nikula wrote: > > On Tue, 12 May 2009 15:16:40 +0300 > > > > Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > > > > Looks like the beep is caused by the ramp operation since beep > > > > is gone in power-down when reverting both of your patches but > > > > it's still present in power-up. > > > > > > But the 'tuck' still there after you have reverted the patches? > > > > Yep it was there even it sounds bit more silent when going to longer > > ramp times. Beep was present only with '109/81/55 ms'. > > Now I'm even more confused... > Without the patches that you have reverted, the ramp delay does not > matter after the playback. It just cuts the VMID and that's it. > On startup the ramp is initiated. If you set the ramp delay longer, > than it is possible that the beginning of the audio is played already > when the VMID is ramping up. > > So with the ramp (down) delay - the patches that you have reverted - > the 'tuck' was worst after playback, than without the proper ramp > (down) delay handling? > Hopefully I didn't confuse you too much :-) So with your patches reverted, the low-frequency pop was gone in power-down since there were no ramp implemented but there still were the sharp snap. I didn't notice were there any difference on that. Then this low-frequency pop went more silent as the ramp time increased. Allways in power-up phase and also in power-down when your patches were in implementing the ramp down. Third observation was that the beep was present with ramp time of '109/81/55 ms'. Without your patches it was present only in power-up and with your patches is was also in power-down phase. So it sounds to me that beep was there when the ramp up or down was going. > I can see on the scope, that the ramp up also has kind of 'tuck' > problem, but it comes when the VMID is quite low, so it is harder to > hear it. By making the ramp delay longer, this 'tuck' happens when > the VMID is close to 0, so it makes it less audible. > I think for me this low-frequency power-up and -down (when your patches are in) pops are caused when the capasitors connected into HSOL/HSOR are charging/discharging through the headphones. What I'm wondering how it is possible to hear such a slow ramp like 100 ms? -- Jarkko _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
