# Is dithering and noise shaping needed when upsampling an audio signal 8 times (from 44.1kHz to 352.8kHz for example)

The main purpose of upsampling before digital to analog conversion is to move quantization noise far beyond the audible spectrum to be able to filter it out by simple second-order low pass analog filter. So dithering may be an overkill in this case.

• no. images resulting from uniform sampling is not the same as quantization error. two different things. the uniform sampling is like quantizing along the $t$-axis and the quantization that is related to dithering and noise shaping is quantizing along the vertical axis. – robert bristow-johnson Dec 23 '16 at 5:12
• is what you want, the transfer function of the quantization error input to the output? that is the only relationship that $f_\text{s}$ has to quantization and noise shaping. – robert bristow-johnson Dec 23 '16 at 17:45