Marcel, thank you very much taking the time to write this pdf.
I already studyed it and i think understood your point.
5th element,
Yes you are right.
Let me be more accurate: i'm not surprised that 2pole filters share some common features.
A sealed box of Qtc 0.577 ( a second order bessell hp) is the filter usually used as benchmark wrt it's behavior with transients ( it have uponthe lowest group delay values).
As Marcel and CharlieLaub pointed the 0.577 give maximaly flat phase beavior. For my intuition low gd ( and smooth behavior once ploted) and maximally flat behavior regarding phase is not coincidence.
Of course if we talked about freq max flat freq is a Qtc of 0.707. But we observe the filter on one of the other side which characterise it ( frequency, amplitude, phase) it's phase rather than freq.
Edit: in one sentence, Marcel's answer sumeup in technical terms what i would have loved to express clearly! 🤣
I already studyed it and i think understood your point.
5th element,
Yes you are right.
Let me be more accurate: i'm not surprised that 2pole filters share some common features.
A sealed box of Qtc 0.577 ( a second order bessell hp) is the filter usually used as benchmark wrt it's behavior with transients ( it have uponthe lowest group delay values).
As Marcel and CharlieLaub pointed the 0.577 give maximaly flat phase beavior. For my intuition low gd ( and smooth behavior once ploted) and maximally flat behavior regarding phase is not coincidence.
Of course if we talked about freq max flat freq is a Qtc of 0.707. But we observe the filter on one of the other side which characterise it ( frequency, amplitude, phase) it's phase rather than freq.
Edit: in one sentence, Marcel's answer sumeup in technical terms what i would have loved to express clearly! 🤣
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