Originally posted by: Red5
The active part of a PAL or NTSC scanline is 52 - 53 usec long and to fill that part with 704 alternating white-black pixels equals a period time of 148.148 nsec which is the same as a 6.75 Mhz signal.
You're right! I forgot to divide the number of pixels by two. Silly me. I'll edit out my misinformation.
Originally posted by: Red5
I've measured the multiburst VITS (Vertical Interval Test Signal) on a few of my PAL LDs and at best the 5 Mhz burst was at -4 dB and quite noisy, so the 5.5 Mhz bandwidth of PAL LD is in practice more like just below 5.0 Mhz.
The active part of a PAL or NTSC scanline is 52 - 53 usec long and to fill that part with 704 alternating white-black pixels equals a period time of 148.148 nsec which is the same as a 6.75 Mhz signal.
You're right! I forgot to divide the number of pixels by two. Silly me. I'll edit out my misinformation.
Originally posted by: Red5
I've measured the multiburst VITS (Vertical Interval Test Signal) on a few of my PAL LDs and at best the 5 Mhz burst was at -4 dB and quite noisy, so the 5.5 Mhz bandwidth of PAL LD is in practice more like just below 5.0 Mhz.
Does that mean that Laserdiscs have test signals embedded in them (during blanking)?
Also, I'm still wondering about Moth3r's statement about DVD's 6.75 MHz translating into 540 lines. Shouldn't it be 720 lines?