Upsampling MQA files to original resolution with sox

[Alandbush]

(14-05-2020 12:56)Cebolla Wrote:  Isn't this upsampling with minimum phase steep filter just a substitute for the final MQA rendering step, which produces the 'further unfolds'?

So, there appears to be nothing here that takes care of the initial step, ie, the actual MQA decoding of the MQA source file track to produce the MQA Core signal (aka 'first unfold').


If that has already been taken into account, how do you get the MQA Core signal/first unfold into MinimServer in the first place?

Precisely my initial thought, so I revisited the original ComputerAudiophile thread (refer to the OPs first post). Unless I have completely misread that threads' opening post, there is no mention of unfolding. In fact, I think there is a specific reference to using the original MQA file as input to Sox which I've inferred as meaning no unfold necessary.

Fortunately, I'm not bothered either way. My age old ears cannot differentiate such subtleties.