Main > Main Forum
15KHZ on a 31KHZ Monitor
genesim:
Oh and for the record..turn off the motion flow if you don't like it. Ooooh problem solved. It has nothing to do with the benefits of a 120hz refresh.
24 frames are still shown five times which is a heck of alot better then what NTSC standards produce, or what 60hz produces. Again..even divisor.
genesim:
Sorry about the "Oooh problem solved". I would rather keep this discussion civilized, and that doesn't help.
It is hard not to sound condescending writing text...as I am sure it can be that way from the other side.
ahofle, I do appreciate you being decent as well as other being more reserved. We can disagree without it turning into a flame war. I am really really trying.
Bluedeath:
I add this only because "real" arcade monitors are in fact nothing more NTSC TVs without tuner.
Movies are in 24 frames (actually 48 since every frame is displayed 2 times to avoid flickering) at the movie teather. when you watch them from a DVD you will see 25 frames (actually the movie is displayed at 104% of the original speed) in Pal systems.
For NTSC systems the trick id done by replicating some frames and discarding some others with a procedure called pulldown normally sequence (if i remember correctly) is 3-2-3 or somethin like that. You see the movie looking on a 120Hz screen because is 4 times the original refresh rate. But unless you have access to 24P material (i don't' know if blue ray disks are always encoded in 24p) you are still seeing the same number of frame that you could see with a 60Hz display.
The 60Hz for NTSC and 50Hz for par were chosen because is the phase timing of the mains power in the countries
where the system were used, this prevented the need of expensive power converters in the TVs.
Is possible to create the missing frames via software but the result os not very good (there are programs to generate slow motion from normal footage)
Edit: Gene i didnt saw that you already expalined this sorry.
Bluedeath:
maybe this can help. If not i apologize in advance.
we should keep separate the emulation software from the process that is needed to visualize it.
Mame by itself doesn't produce any video signals when it runs create a virtual screen that is not what you really see displayed by your card. This screen is "rendered" and then visualized by the software driver that manage your video card. when you set the options in MAME you set the frame rate and the resolution of the emulation (basically what i called the virtual screen) then you video card translate it into video signals for the display.
This means that Mame cannot tweak the sync signal to drive a 15KHz display so you need a software solution that does that.
Advance MAME instead is born with the ability to directly control the video card to to output a 15KHz signal and what you see when you use it is the closest approximation to the "virtual screen" that MAME creates.
Differences are due to the fact that Normal MAME works trough and HAL (hardware abstraction layer) while Advacne MAME has direct control over the video chips in the card.
Theoretically (and i underscore it thousand timetheoretically ) all the cards could output 15KHz signals if driven in the correct way is but this is not their "native" frequency since they are supposed to work with 31kHz display, so by default in the firmware of the card this is set to output a 31KHz signal.
genesim:
As far as I know 24p is the standard for most Bluray movies.