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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: What's the problem with "brick wall" filtering? posted by Dan Banquer on December 2, 2006 at 13:27:19:
> The above experience makes me wonder just how much the poor transient
> reponse of a FIR brickwall digital filter has on recorded music.It would depend on the characteristics of the particular filter. Filtering in time, rather than frequency as in my example, can avoid the problem of using samples from the future (apart from the delay) but at the cost of a less than perfect brick wall filtering. Since a perfect brick wall filter is actually undesirable for most applications some form of imperfect filter is going to be optimal although this will change from application to application depending on precisely what is trying to be achieved.
The design of a filter is going to presumably seek to use the least brickwall-like filter (gentlest slope) that avoids significant aliasing and does not significantly degrade the audible highest frequencies and therefore minimises the degree of ringing. It is straightforward to quantify all the tradeoffs. It would also seem pretty straightforward to determine what is and what is not audible in terms of amplitude change, phase change and ringing around transients. I presume all this has been done a long time ago but it is not my field and so I cannot provide references.
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- Re: What's the problem with "brick wall" filtering? - andy19191 14:54:07 12/02/06 (0)
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