CMSS-3D for surround speakers on the other hand performs the same task like CMSS-3D Headphone, except it doesn't have to downsample all the stuff in the end into 2 channales, but it will output it like simulated 10.1 on a physical 5.1 (or even more since i don't know ho wmany channels it's interpolated with HRTF like algorithm. You dont need to handle special case for it (as its not special). Testing a register against itself, such as in the example above. Probably you dont understand twos complement representation completely. It's an HRTF like calculation that Creative acquired from several companies like Sensaura or A3D. To do this, games will use the compare (cmp) and test operations: cmp eax, 2 test eax, eax. It will downmix surround to headphones with maximal precision including interpolation/prediction of middle channels between each otherwise physical one, that would otherwise be heard on 5.1+ systems (like extra channel between every regular 5.1 channel). That virtualized surround for music is just spatialized and processed sound while gaming CMSS-3D Headphone is an advanced surround channel downmixer. Music never moves in full 3D environment like gaming sounds do. Even though they have the same name, they perform completelly different. Don't mix CMSS-3D for music and CMSS-3D for gaming.
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