Publius
500+ Head-Fier
- Joined
- Nov 23, 2003
- Posts
- 723
- Likes
- 21
Quote:
There isn't anything particularly sophisticated about the reconstruction - CoolEdit just does spline interpolation IIRC, but a more technically accurate solution is sinc interpolation. They're both easy-peasy. Dither is rarely if ever used.
BTW, I have been made aware that some modern, inexpensive sound cards are out there whose DACs, in fact, lack a reconstruction filter. Doesn't really affect this conversation much but it's worth noting that such beasts do exist and require slightly more work to dismiss out of hand.
| Originally Posted by gregorio /img/forum/go_quote.gif BTW, when the reconstruction is done, it's a little more sophisticated than just drawing a line between the dots (sampling points). The values between the sampling points are interpolated with some fancy maths which apply dither algorithms. This results in a perfectly linear (without error) recreation of the original waveform, plus a little un-correlated noise down at the LSB level. |
There isn't anything particularly sophisticated about the reconstruction - CoolEdit just does spline interpolation IIRC, but a more technically accurate solution is sinc interpolation. They're both easy-peasy. Dither is rarely if ever used.
BTW, I have been made aware that some modern, inexpensive sound cards are out there whose DACs, in fact, lack a reconstruction filter. Doesn't really affect this conversation much but it's worth noting that such beasts do exist and require slightly more work to dismiss out of hand.
