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beetlemania, then Ayre was able to adapt the new circuit board and whatever else to the present filters which surprises me. |
Ayre implements the filters in a Xilinx FPGA,
which provides the necessary horsepower. In an e-mail, Hansen told me
that, during the development of Ayre's digital products, "We have custom
filters whereby we can load whatever coefficients we want into [the
FPGA] . . . an external switch allows us to load different filter
coefficients and hear the audible changes they make. This is a great
test, as it allows for everything else to be held completely
constant. I spent four solid months doing nothing but listen[ing] to the
effects of various filters—corner frequency, stop-band response,
minimum-phase vs linear-phase, apodizing, sharpness at the 'knee,' windowing functions, interpolation rates (eg, 2x vs 4x vs 8x vs 16x), dithering functions . . . every single factor I could think of.
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beetlemania, that's interesting. Is this universal in the sense that recording engineers and others have the same ability?
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