Hi there,
Regarding AS upsampling to DSD, could anyone explain what the DSD Sigma-Delta Modulator filter type (A, B, C) does?
I understand what the n-th order is, but not the filter type (A, B, C). Could anyone enrich my understanding on that?
Regards, Ed
I’m going to offer some possible definitions, along with references:
“A” type = Apodizing Filter
“B” type = Brickwall Filter
(As extrapolated from this article: Website of Wayne Stegall - Delta-Sigma Modulators - Their basic theory of operation)
“C” type = Central difference Filter
(As extrapolated from this paper: https://123.physics.ucdavis.edu/week_5_files/filters/digital_filter.pdf)
More insights found here:
https://www.beis.de/Elektronik/DeltaSigma/DeltaSigma.html
That’s extremely useful! Thank you, brother.