Originally Posted by bananamane
I dont think I worded my question right.
Lets take DVD instead of BR. If I get a DVD and watch it thru the PS3 with an HDMI cable its in DD 5.1, now if I watch a movie on directv which is hooked up with an HDMI cable. Both sources outputting DD 5.1. Same movie and everything.
Not the same everything
. It is pretty well known that bandwidth for OTA, satellites and to a lesser degree cable systems is more likely to be intentionally limited as compared to pre-recorded media, particularly Blu Ray.
Are there differences between the two? If so, what would they be? Would the direct tv version have the same frequency ranges or would it be lacking?
I would expect more measurable bandwidth limiting of the video than the audio. And the bandwidth limiting is almost always related to high frequencies, not low frequencies.
Let's put it this way. If I compare OTA HDTV from a local studio-originated program to the same thing over cable, particularly for OTA channels that are running just one program at a time, I can generally see the extra resolution in the OTA signal.
Technically speaking one often finds that while an OTA HDTV channel can use the entire 6 MHz channel, while the channel spacing on cable systems is usually no more than 3 MHz. Go figure!
This can show up big time if you are watching a live local sports event that never went through a national network.
This comes right out and smacks you right in the file size versus time stats, if you do video capture on a PC.