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Linear Phase EQ, Whats it do, tell tell.
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| Innocence Lost |
Yeah everytime i load up an eq i see it i rather whats it for and wwere do u put it?
Thanks in advance. |
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| inversoundzzz |
http://en.wikipedia.org/wiki/Linear_phase
http://en.wikipedia.org/wiki/Phase_response
I think it's basically...like aligning all the incoming signals....together...so they flow out in the proper phase relationships....it's really small amounts of time though....like when you have incoming audio signal...when it leaves the EQ, you dont want the phase of all the incoming frequencies harmonics to get shifted all out of their original phases....maybe..something like that..idk..i use ableton EQs only and I dont see any setting tlike that....it sounds like a more advanced process....in more advanced filters...i think. |
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| Lucidity |
| It's generally used for precision eq'ing, where you might want to have sharp steep slopes without having phase shifting. It sounds more natural and doesn't color the sound as much. Could be useful for mastering and acoustic material, ect... this is how I understand it anyways. |
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| Raphie |
with linear phase, time and frequency are mathematically aligned, which is sounding more natural especially with sharp filter curves.
Though it's more a marketing thing than a noticeable real world advantage. Don't worry about it. |
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| Storyteller |
| What Raphie said. Basically same story as analog vs digital. |
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| Kthought |
It's for live recorded drums.
Trance? nah |
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| Vernon Wanderer |
| A type of eq that doesn't cause phase issues when manipulating frequencies. Very useful for critical mixing. |
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| echosystm |
| quote: | Originally posted by Raphie
with linear phase, time and frequency are mathematically aligned, which is sounding more natural especially with sharp filter curves. |
Linear phase filters don't sound natural at all. That is total placebo. They pre-ring and that is not a thing that happens in nature. Minimum phase filters mimic filter effects in nature much more accurately.
Anyhow, there's basically two scenarios in which to use a linear phase filter.
1. You need to EQ one or more phase-aligned tracks, such as two microphones recording one drum. If you use a minimum phase EQ, you might get phasing between those tracks. In practice, it generally won't be noticeable.
2. You're doing hardcore EQing. The more extreme the curve is on a minimum phase filters, then the more phase is affected. In practice, almost no one actually needs to use filters so steep that this is a problem. If you think you are in that group of people, then you're almost certainly wrong and have no idea what you're doing. All you're doing is trading phase changes for unnatural pre-ringing.
Just for the record... Almost all analog filters are minimum phase. When I say "almost all", I mean literally every filter on every analog mixing console ever made, regardless of how many houses could be purchased in lieu of said mixing desk. Linear phase analog filters are probably only used for industrial or scientific purposes. In other words, the world's top mixing and mastering engineers use minimum phase filters pretty much exclusively.
TLDR; don't use linear phase filters. If you don't fully understand the difference at a physical level, then you will probably do more harm than good. |
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| JPaulizle |
| Dropin the knowledge, right on. |
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| Raphie |
I didn't say they sounded more natural in general, but sound more natural than non phase filtered on very small Q's
I guess we're saying the same thing. You just took the time to expand more.
| quote: | Originally posted by echosystm
Linear phase filters don't sound natural at all. That is total placebo. They pre-ring and that is not a thing that happens in nature. Minimum phase filters mimic filter effects in nature much more accurately.
Anyhow, there's basically two scenarios in which to use a linear phase filter.
1. You need to EQ one or more phase-aligned tracks, such as two microphones recording one drum. If you use a minimum phase EQ, you might get phasing between those tracks. In practice, it generally won't be noticeable.
2. You're doing hardcore EQing. The more extreme the curve is on a minimum phase filters, then the more phase is affected. In practice, almost no one actually needs to use filters so steep that this is a problem. If you think you are in that group of people, then you're almost certainly wrong and have no idea what you're doing. All you're doing is trading phase changes for unnatural pre-ringing.
Just for the record... Almost all analog filters are minimum phase. When I say "almost all", I mean literally every filter on every analog mixing console ever made, regardless of how many houses could be purchased in lieu of said mixing desk. Linear phase analog filters are probably only used for industrial or scientific purposes. In other words, the world's top mixing and mastering engineers use minimum phase filters pretty much exclusively.
TLDR; don't use linear phase filters. If you don't fully understand the difference at a physical level, then you will probably do more harm than good. |
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| kaboom75 |
EQ Eight in Ableton live 9 was re programed with help from Andy at Cytomic.
"The new algorithm for EQ 8 is an analog model of a linear SVF circuit, and as such shares the excellent noise performance, as well as ultra smooth modulation properties, of the ideal circuit. The cutoff of EQ 8 can be swept smoothly with automation without the horrible artefacts of commonly used EQ algorithms."
"Tell us about the SVF filters you helped to design for EQ8 – what makes them sound better than the old filters? Were they modeled off of hardware filters?
This is a little tricky to answer in detail as it is actually really technical. The old filter algorithm is a digital abstraction that shares the same theoretical response as many circuits, but doesn't model the voltages of any circuit. The new algorithm is a linear SVF analog model based on the circuit of the Urei 545 parametric EQ. In a linear model no drive occurs, so if you put a single sine wave in you get just a sine wave back out again without any harmonics being added.
So in theory, given infinite precision numbers, and if you don't adjust any of the settings, both will sound identical. In practice computers don't have infinite precision and people tend to like adjusting the controls on their EQs!
The new linear SVF EQ algorithm in EQ8 has astounding noise properties that give the lowest noise possible for any given finite precision numbers computers use, and since it is an analog model you can also smoothly change all the settings without getting horrible pops and clicks.
In combination with the new frequency analyser the new SVF algorithm will make tuning in on which frequency you want to adjust much easier since the sound remains silky clean even when you are adjusting the settings. Once you have found the setting you want no unwanted noise will be added to your audio."
http://www.cytomic.com/ableton-and-cytomic
https://www.ableton.com/en/blog/andrew-simper-glue-eq-eight/ |
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