Mp3 to DSD Conversion

[pkane2001]

5 hours ago, yamamoto2002 said:

Several years ago I created very poor performance 44.1kHz 16bit WAV to 2.8MHz 1bit converter (IIRC 2nd order noise shaper) and found the sound difference, constantly annoying noise is heard from 2.8MHz 1bit

 

by increasing noise shaping filter order, sound quickly becomes not so different from original 44.1kHz 16bit PCM, I cannot hear the SQ difference with 4th or higher order noise shaping filter

 

I've experimented with DSD a bit and found that a 7th or 8th order NS was necessary for best (computed) results. My 8th order noise shaper working on DSD256 produces a signal that matches up to the same recording in 96KHz/24bits better than -120dB if you consider up to about 36KHz. Starts to diverge a bit after that causing about a 10dB jump between 36 and 48KHz, which is still below -100dB, so not bad at all.

 

 

Phase is also nearly perfectly matched up to about 25Khz, but then starts to diverge.