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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: May not be undesirable posted by Dave Kingsland on December 6, 2006 at 09:09:28:
"The point of converting to 176.4 KHz and burning to DVD-A is so that on playback, the digital reconstruction filter of the player will be up around 88.2 KHz and thus will not interfere with the 22.05 KHz reconstruction filter being tested."The signal stored on the DVD-A would simply be the 4x oversampled filtered signal. It should be no different than playing a CD via a 4x oversampled filter. It may be cleaner in the sense that the extra processing has already been done before being stored on the DVD-A media.
In regard to the ringing, as I stated, it seems counter-intuitive. The HF rolloff using a filter with less ringing is due the HF modulation near half the media's sample frequency. The ringing in the brickwall filter "smooths out" this modulation, raising the average HF amplitude to "flat," creating the true brickwall response. But the "peak" amplitude with both filters is actually the same! This is why the perceived HF response with a gradual digital filter seems "flatter" (and more-resolute in time response) than what the measured FR would suggest.
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Follow Ups
- Re: May not be undesirable - Todd Krieger 08:59:28 12/07/06 (3)
- Re: May not be undesirable - Dave Kingsland 09:44:49 12/07/06 (2)
- Re: May not be undesirable - Todd Krieger 00:09:23 12/08/06 (1)
- Re: May not be undesirable - Dave Kingsland 09:06:44 12/08/06 (0)
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