| Ssenkahdavic said: Check this OUT. Bandwidth calculator (appromation only of course). This is run off a Sony run formula for Video Bandwidth (that does NOT include bandwidth cutting techniques, IE what you stated above). The actual, uncut bandwidth number for 1920x1080x2x60hz = 373.2 Mhz (more than 1.3/1.4 can handle without a bandwidth cutting tech) Taking that 373.2 Mhz down to 297 Mhz (with frame packing) is around 20% reduction in bandwidth. Thats pretty damn impressive. I was getting my nomenclature a bit wrong. Bandwidth for video = Total Number of frames x hz (so for 3D its double 1920x1080xverticle refreshrate). Bandwidth has no notion of data amounts (why the color depth does not matter) I was finding BITRATE (gigabites/sec). Just thought I would correct myself before someone else did :) I was also assuming that they ran at a steady 60 frames per second.
Just to be thourogh: Here is the bandwidth formula (one of many but its the easist to approximate) SF = [(TP x Vt)/2]3 SF = Signal Frequency (or bandwidth) TP = total pixels Vt = vertical refreshrate |
Nice. This is pretty handy. You are quite a mathemaitician... :)
So the current scenario is:
- 3D 1080p@60 requires more bandwith than HDMI 1.3/1.4 offers (372 Mhz)
- But due to frame packing method which the 1.4 standard introduced to reduce bandwith, HDMI 1.3/1.4 chips can indeed do 1080p@60hz in 3D in theory (297 Mhz)
- However the 3D TVs currently on sale do not have fast enough HDMI chips to do 297 mhz of bandwith hence they don't support 1080p@60 hz in 3D
- Because 1080p@60 hz is not a manditory standard for these new TVs, and the TVs are able to do 1080p@24hz for bluray, they are able to get away with putting Full HD 3D on the box.
It looks like I dodged a bullet when decided to to buy these TVs yet. I say within a year max, we will have new 3D TVs which can do 1080p@60hz...
