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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 andy19191 on December 2, 2006 at 13:11:59:
"Unfortunatley, a sharp change in time or freqency maps to a wide change in frequency or time respectively. The step change in frequency of the brick wall filter will produce wide periods of "ringing" where significant energy has been removed from the original time signal. This can, for example, make a quiet section before/after a transient something other than quiet."Recording engineers call this "pre echo".
In any case I did a fair amount of monitoring music coming out of my DAC and at least 95% of the more square like wave forms were from digital limiting done at some point in the recording/mixing/mastering process. From one CD I was monitoring I found a non digital limited sqare wave at about a few hundred hertz and yes there was some overshoot on it. Whether this was an artifact or a real waveform I will probably never know.The above experience makes me wonder just how much the poor transient reponse of a FIR brickwall digital filter has on recorded music.
d.b.
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Follow Ups
- Re: What's the problem with "brick wall" filtering? - Dan Banquer 13:27:19 12/02/06 (1)
- Re: What's the problem with "brick wall" filtering? - andy19191 14:54:07 12/02/06 (0)
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