Upsampling article wanted - short and comprehensible

[dabassgoesboomboom]

@ged_hickman1

Anyone know of an article on upsampling and why one might use it that doesn’t immediately dive into math or the discussion of Fourier transforms?
I don’t use it but I’m on holiday in the house for a week in a few days so have time to experiment.
Thanks.

Below is a link to a cool post, with very pretty pictures!

Before any jumps in and says many DACs are already upsampling, Jussi adds a comment about this in his final paragraph.

HQPlayer vs. Roon

Upsampling is same as oversampling, but used to emphasize DAC side process and that proper digital filters are used for it (which is not always the case for oversampling). Oversampling itself is explained here: Digitally sampled signal has spectrum that repeats itself at multiples of sampling rate, these are called images. Starting from band 0, every even spectrum is normal forward frequency content and every odd spectrum has inverse frequency content. To properly reconstruct analog signal,…