Sampo - MQA is based on finite rate of innovation sampling (and reconstruction) theory. Primary authors are M. Unser, M. Vetterli, P.L. Dragotti, and others.
I can’t unravel whatever you think it is based on your sentences below. Craven’s minimum phase reconstruction in the ultrasonic? Have you read any of the papers (admittedly they are not as elucidating as they could be)? > On Jan 7, 2022, at 9:31 PM, Sampo Syreeni <de...@iki.fi> wrote: > > On 2021-11-20, vicki melchior wrote: > >> Not to open the MQA topic here since it’s been discussed endlessly. > > MQA appears to be shit, both in theory and its empirical validation. Craven's > ideas about minimum phase reconstruction might just be tenable, in the > ultrasonic regime, but MQA really isn't about that, even. It's about forgoing > usual reconstruction via the sampling theorem, by utilizing low order > polynomial interpolation. Then about dual Gaussian quadrature to "fold back" > that stuff. > > That is just stupid and ineffectual. It's unbelievable Meridian would ever go > there. As the prime DSP firm, they really should have known better, for > years, if not decades, already. > >> You mention no one caring about CD but Japan is 80% CD. MQA CDs are sold >> there. > > They should not be. Idjit-audiophiles, them. > > What I'm saying is that subtractive dither sounds surprisingly good even at > 14-bit lossless, and it can be developed towards what Acoustic Reneissance > for Audio said years back, about bandwidth, bit depth, and in-band noise > shaping, in regard to the competing audio formats of the time. It'd shave one > bit off, and it'd leave the recording amenable to further processing, without > noise accumulation. Nothing lost, some gained. > -- > Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front > +358-40-3751464, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
