Digital Drive

RE: Because recordings are made with different filters

68.104.246.173

Todd Krieger

In Reply to: RE: Because recordings are made with different filters posted by Tony Lauck on September 01, 2015 at 09:21:49

Since the A/D filtering method is almost never disclosed with a recording, we have to fall back on the music type, in regard to selection of the best-suited D/A filtering method.

If the A/D filtering method were disclosed with all recordings, I agree it would take a lot of guesswork and evaluation out of the D/A filter selection process.

Follow Ups:

RE: Because recordings are made with different filters - Tony Lauck 12:49:07 09/02/15 (0)
Neither the A/D filter mode or the polarity (absolute phase) are disclosed. However, to the extent that they matter they are readily discernible by listening. I suspect, but I haven't tried confirming this, that one can discern the general parameters from examining the files, e.g. looking at spectrograms and waveform plots of transients.

The most important parameters of a filter are 1. its center frequency, 2. the width of the transition zone, 3. the depth of the transition zone, and 4. whether the filter is linear phase, minimum phase, or some mixture thereof. The first three factors are readily pulled from spectral plots. If one can find a transient in the music at the right point, one can see the extent of "pre-ringing". This will not necessarily answer which filters are best for playback, because there are other issues as well, e.g. tonal balance issues a function of microphone placement and EQ and system "house curve" issues as a result of speaker/room interactions.

Tony Lauck

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

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