The DVD-A (DVD Audio Standard) is 96Khz 24-Bit. Standard DVD, as mentioned above, is 48Khz 16 Bit
Laserdisc is analog and can sound awesome even though they output 44.1
This is not true. While the first LDs had analog sound, the "modern ones", since about 1987 or so, all have PCM 44.1KHz/16 Bit sound. The "digital out" Rwwear speaks of won't convert the analog signals. If using the digital out from an LD player when playing an analog-only (early) LD, you will get nothing out ... at least on all the players I used until 1995.
Sheesh, sorry to revive an old thread. :)