On Tue, 12 May 2009 16:16:08 +0300 Peter Ujfalusi peter.ujfalusi@nokia.com 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@nokia.com 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?