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Hii Guys
I am not an engineer, my background is applied math and computer science, and I normally post over in the QM sub-forum. I have an interest in audio, and know Shannon's sampling theorem and what not. I know what dither is and how it works, but in investigating MQA coding I came across something I have I ever heard about before - subtractive dither. As far as I can see one adds a psudo-random dither prior to digitization then subtracts it after digitization before playback. All I can think of in how to subtract it is start with the same pseudo random seed. But what I don't get is how it improves things - you add and subtract the same thing so you really haven't done anything.
Anyone know what the go is - MQA looks very interesting technically and does sound fantastic, but this one has me a bit confused.
I did a listening session with a very experienced audiophile on a (very) high end reference system yesterday with MQA from Tidal (the album Blue which we both know well) and using just the first unfolding from the Tidal app we were gob smacked and I ordered a full MQA DAC to see what full unfolding does. Its the real deal - many things in audio aren't.
Thanks
Bill
I am not an engineer, my background is applied math and computer science, and I normally post over in the QM sub-forum. I have an interest in audio, and know Shannon's sampling theorem and what not. I know what dither is and how it works, but in investigating MQA coding I came across something I have I ever heard about before - subtractive dither. As far as I can see one adds a psudo-random dither prior to digitization then subtracts it after digitization before playback. All I can think of in how to subtract it is start with the same pseudo random seed. But what I don't get is how it improves things - you add and subtract the same thing so you really haven't done anything.
Anyone know what the go is - MQA looks very interesting technically and does sound fantastic, but this one has me a bit confused.
I did a listening session with a very experienced audiophile on a (very) high end reference system yesterday with MQA from Tidal (the album Blue which we both know well) and using just the first unfolding from the Tidal app we were gob smacked and I ordered a full MQA DAC to see what full unfolding does. Its the real deal - many things in audio aren't.
Thanks
Bill
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