The interpolation table used by the SPU is mistakenly named as Gaussian from when it was originally dumped because it looks like a Gaussian.
The table is actually windowed-sinc filter using a Blackman window as derived here https://forums.nesdev.org/viewtopic.php?t=10586.
The interpolation table used by the SPU is mistakenly named as Gaussian from when it was originally dumped because it looks like a Gaussian.
The table is actually windowed-sinc filter using a Blackman window as derived here https://forums.nesdev.org/viewtopic.php?t=10586.