Wayde_R
Stunt Coordinator
- Joined
- Aug 25, 2003
- Messages
- 244
Hello. Sorry about all newb questioning in the forum today.
Please correct me if I'm wrong in any assumption I make about video and TV.
Regular (non-hi def) broadcast TV has 480i. 480 lines horizontal interlaced. Do they give a number for vertical lines?
I understand interlaced means every other scan line alternates on/off position each cycle. But what is a cycle? Do the scan lines alternate their on/off cycles with each frame? I believe NTSC video has 25 frames per second (is this correct?). So, that means 480i alternates 25 times per second. Or is there some other frequency by which interlaced video signals are alternating.
The best a DVD player can do today with progressive scan is upconvert that 480i image to 480P on a TV capable of such definition. I've read people talk about upconversion to 1080i, how can this be in our pre-HDDVD era? Don't they really mean it's upconverted to 480P on an HDTV capable of 1080i?
Thanks in advance for answers to some of these questions. I've read the newbies guides here on this site and on others, very helpful.
Wayde
Please correct me if I'm wrong in any assumption I make about video and TV.
Regular (non-hi def) broadcast TV has 480i. 480 lines horizontal interlaced. Do they give a number for vertical lines?
I understand interlaced means every other scan line alternates on/off position each cycle. But what is a cycle? Do the scan lines alternate their on/off cycles with each frame? I believe NTSC video has 25 frames per second (is this correct?). So, that means 480i alternates 25 times per second. Or is there some other frequency by which interlaced video signals are alternating.
The best a DVD player can do today with progressive scan is upconvert that 480i image to 480P on a TV capable of such definition. I've read people talk about upconversion to 1080i, how can this be in our pre-HDDVD era? Don't they really mean it's upconverted to 480P on an HDTV capable of 1080i?
Thanks in advance for answers to some of these questions. I've read the newbies guides here on this site and on others, very helpful.
Wayde