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Is this a way to evaluate phase group delay ?
2 posts
• Page 1 of 1
Is this a way to evaluate phase group delay ?
Just randomly, trying to compare some phase i get this.
is this a way to check if a system have linear group delay ?
It seams to works but i'm not 100% sure.. Also the graphic must be not in a log view to see a linear function, but it make more hard to clearly see witch frequency will be the more phase distorted..
is this a way to check if a system have linear group delay ?
It seams to works but i'm not 100% sure.. Also the graphic must be not in a log view to see a linear function, but it make more hard to clearly see witch frequency will be the more phase distorted..
- Attachments
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- Linear phase group delay evaluation.fsm
- (102.66 KiB) Downloaded 495 times
- Tepeix
- Posts: 354
- Joined: Sat Oct 16, 2021 3:11 pm
Re: Is this a way to evaluate phase group delay ?
Hum, some while after i discover that the module of the precedent post is a little stupid..
If i understand well, the bode plot i use was in log mode.
To see if the phase is linear we could switch to linear mode which help to see if there's a curvature;)
But now here's a virtual linear delay representation.
(i hope it works and present reality and not something else?)
I plan to use it to try to implement a 2th order allpass interpolation.
(One thing i learn about this is that the 2th order could correct the phase of some frequency, but at the price of making worse other's. (not 100% sure of this but almost) generally the 2th order will make the <1,x/2 nyquist better but >1,x/2 nyquist worse.. ...EDIT Thinking more about this, it's maybe wrong, the phase will be less linear at the end but each frequency will have less additional delay ?)
So providing a fractional delay it give the virtually perfect (i hope) phase response and make possible to compare with a true delay phase response.
If i understand well, the bode plot i use was in log mode.
To see if the phase is linear we could switch to linear mode which help to see if there's a curvature;)
But now here's a virtual linear delay representation.
(i hope it works and present reality and not something else?)
I plan to use it to try to implement a 2th order allpass interpolation.
(One thing i learn about this is that the 2th order could correct the phase of some frequency, but at the price of making worse other's. (not 100% sure of this but almost) generally the 2th order will make the <1,x/2 nyquist better but >1,x/2 nyquist worse.. ...EDIT Thinking more about this, it's maybe wrong, the phase will be less linear at the end but each frequency will have less additional delay ?)
So providing a fractional delay it give the virtually perfect (i hope) phase response and make possible to compare with a true delay phase response.
- Attachments
-
- Virtual Linear phase delay.png (9.56 KiB) Viewed 10880 times
-
- Virtual linear delay plot.fsm
- (32.09 KiB) Downloaded 479 times
- Tepeix
- Posts: 354
- Joined: Sat Oct 16, 2021 3:11 pm
2 posts
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