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#1
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Interesting reading min phase vs linear phase
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#2
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Interesting reading min phase vs linear phase
"Mark" wrote in message
... http://ccrma.stanford.edu/~jos/filte...lly_Ideal.html The "correct" answer is that it depends on what you're using the filtering for. Most -- but not all -- deviations from flat amplitude response are minimum-phase, and require minimum-phase correction. |
#3
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Interesting reading min phase vs linear phase
On Feb 13, 2:04*pm, Mark wrote:
http://ccrma.stanford.edu/~jos/filte...lly_Ideal.html Mark this supports my contention that brick wall (steep) filtering always has a bad transient response (ringing). The only way to make a filter with better transient response (less ringing) is to make the transition band more gradual. Changing the phase response can move the ringing around, (before or after the main response) but does not eliminate it. Mark |
#4
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Interesting reading min phase vs linear phase
In article ,
Mark wrote: On Feb 13, 2:04=A0pm, Mark wrote: http://ccrma.stanford.edu/~jos/filte...lly_Ideal.html this supports my contention that brick wall (steep) filtering always has a bad transient response (ringing). The only way to make a filter with better transient response (less ringing) is to make the transition band more gradual. Changing the phase response can move the ringing around, (before or after the main response) but does not eliminate it. In the analogue domain, this is the case. In the digital domain where we can build FIR filters, it's not the case at all. Consequently, we use oversampling on digital converters to move as much of the anti-aliasing and reconstruction filter into the digital domain. I strongly recommend the discussion of filtering in _Signals and Systems_ which is a good introduction to the math. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Interesting reading min phase vs linear phase
"Mark" wrote in message
... On Feb 13, 2:04 pm, Mark wrote: http://ccrma.stanford.edu/~jos/filte...lly_Ideal.html Mark this supports my contention that brick wall (steep) filtering always has a bad transient response (ringing). The only way to make a filter with better transient response (less ringing) is to make the transition band more gradual. Changing the phase response can move the ringing around, (before or after the main response) but does not eliminate it. This is not completely true. |
#6
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Interesting reading min phase vs linear phase
On Feb 14, 1:53*pm, (Scott Dorsey) wrote:
In article , Mark wrote: On Feb 13, 2:04=A0pm, Mark wrote: http://ccrma.stanford.edu/~jos/filte...lly_Ideal.html this supports my contention that brick wall (steep) filtering always has a bad transient response (ringing). *The only way to make a filter with better transient response (less ringing) is to make the transition band more gradual. *Changing the phase response can move the ringing around, (before or after the main response) *but does not eliminate it. In the analogue domain, this is the case. *In the digital domain where we can build FIR filters, it's not the case at all. *Consequently, we use oversampling on digital converters to move as much of the anti-aliasing and reconstruction filter into the digital domain. I strongly recommend the discussion of filtering in _Signals and Systems_ which is a good introduction to the math. --scott -- "C'est un Nagra. *C'est suisse, et tres, tres precis." I'm sorry to disagree. An FIR filter with a linear phase will still have ringing if the frequency resonse is steep. This is shown in the example in the Stanford site. The min phase filter (typical of an anlog filter) has post ringing. A linear phase filter (typical of a digital FIR filter) has both pre and post ringing. The duration is less but the point of the artcile is that pre ringing is more objectionalbe compard to post ringing. In any case the linear phase filter still does have ringing. The bottom part of Fig 11.2 is a linear phase filter like a typical FIR filter. Mark |
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