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RE: slow/fast roll-off filters pre-ringing in real world?

Posted by Tony Lauck (A) on July 20, 2015 at 13:18:39

In Reply to: RE: slow/fast roll-off filters pre-ringing in real world? posted by Todd Krieger on July 19, 2015 at 17:33:24:

Best results will depend on the filtering used in the ADC or downsampling. This can be shown by theory, measurement and listening tests.

If the original recording was apodized and used a minimum phase filter, then it will be possible to use a steep linear phase filter without introducing any preringing (or adding any additional post ringing) or adding additional phase shift. If not, then other filter settings may be needed for best results. As a general rule, however, if one wants to use the same settings for all recordings then it is probably best to use a linear phase filter with slow roll-off (and slightly apodizing). This minimizes the maximum sonic damage, IMO.

I spent a lot of time reaching these conclusions. In the end, I concluded that the 44 kHz formats were inadequate and that it was probably not worth obsessing over this unfortunate fact of history. Filter choices at higher sampling rates are much less signficiant.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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