Originally Posted by nitrotg
Can anyone explane how the 120hz works?
Is it compined with the smootmotion feature or?
Since its only accepting 60hz from a source..
Thx in advance
There is several possible situations to consider depending upon the source used and if smooth motion or 5:5 pull down is off or on. If smooth motion is on, then 5:5 pull down is turned off automatically. If smooth motion is off, then you have to turn 5:5 on if you want it. 5:5 only works with 60hz sources showing material that uses 3:2 pulldown (ie: movies).60hz source + smooth motion on:
An intermediate frame is produced that approximates what would have happened had the source been 120hz. The extra frame is then added into the data stream and each old frame is shown for 1/120th second followed by the new frame for 1/120th of a second (the total time is still 1/60th second). The effect is to smooth out the motion by adding in a frame that attempts to calculate what might have happened between the first 60th second and the next. If the approximation fails, then you may see disturbances very fleetingly on the screen.60hz source + 5:5 pulldown (smooth motion off) (movie source requiring 3:2)
3:2 is expanded to 6:4 (by doubling all the frames) and then the last frame in the 6 is replaced with a frame copied from the 4 to produce 5:5 and eliminate 3:2 effects. All 10 (5+5) frames are shown for 1/120th second instead of the five frames for 1/60th second.60hz source (no 3:2 required - eg football):
Each frame is doubled and shown twice at 1/120th second each.24hz source (blu ray) + smooth motion on:
An intermediate frame is produced that approximates what would have happened had the source been 48hz. Then the old frame plus the new frame are each shown twice in a row for 1/96th of a second (96 hz). The net effect is four frames displayed, two old followed by two new but four times faster.24hz source - smooth motion off:
Each frame is shown four times in a row @ 96hz. No intermediate frames are made.
Note that only 60hz material becomes 120hz. 24hz original material uses 96hz.