Popular Post Fokus Posted June 5, 2021 Popular Post Share Posted June 5, 2021 Quote Not only is it showing minimum phase, and non-linear ringing characteristics, the ringing also does not decay linearly. Above is the impulse response of GoldenOne's 44.1kHz master after MQA encoding. Given that Meridian/MQA see impulse pre-ringing as the spawn of the devil one would expect them here to deploy what they call an apodising filter as used in the Meridian 808.2 CD player: minimum phase, cutting in after 20kHz, but reaching a lot of attenuation at 22.05kHz. But they don't, because the frequency magnitude response of the MQA encoded version is the same as that of the master. Only the phase differs. I think it is safe to conclude that this is a direct application of Meridian European Patent Application EP3029674A1 "Mastering improvements to audio signals" where an all-pass filter is proposed to take any pre-existing pre-ringing and dump it after the main response lobe. botrytis, opus101 and Currawong 3 Link to comment
Popular Post Fokus Posted June 10, 2021 Popular Post Share Posted June 10, 2021 On 6/5/2021 at 4:21 PM, Fokus said: I think it is safe to conclude that this is a direct application of Meridian European Patent Application EP3029674A1 "Mastering improvements to audio signals" where an all-pass filter is proposed to take any pre-existing pre-ringing and dump it after the main response lobe. The cross-correlation between the 88.2kHz original and the unfolded MQA version shows that similar all-pass filtering is being applied to 2x rate source material: https://pinkfishmedia.net/forum/threads/mqa-pt-ii.255443/page-50#post-4383413 http://jcgl.orpheusweb.co.uk/temp/EvenMoreInteresting.png Currawong, Nikhil and botrytis 3 Link to comment
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