Pink Noise Dithering - filmgrain of audio

Got higer order noise shaper figured out. It's actually a lot easirer than I thought for PCM signals. For 5th order noise shaper, its truncation resistance is about 5bit:

So the pattern is, as long as the white noise portion doesn't get above the slope noise, whether the slope is at high or low frequency, the quantization noise won't be distinguishable.

However, I still didn't like the sound of this 5th order noise shaper on my Gungnir Multibit. At 4x OS, the shaper demands a 5th order filter at 30kHz, which I don't think my DACs are that aggressive. The result sound is a little digitus and robotic. 9th order noise shaper sounds even worse on my setup.

Therefore, it's another advantage of pink noise dithering, that it is much less demanding on the analog filters. Aliasing doesn't show up until 1.5~2x of the nyquist frequency.

 

Nice, I'll download this and give it a listen at the weekend!