Delay with Linear Phase EQ

Hi!
I woukd like to know .
Why i have delay when i use LPEQ?
There is no delay with other Logic's plugins .
Thanks!

It's required for the nature of the algorithm. You can use PlugIn Delay Compensation. Also, ChannelEQ's settings are interchangeable with LPEQ's - use Channel while tracking if you must.
J

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Audio gets delayed with Plugin - Help please!

I have a simple setup. Several external MIDI modules and an M-Audio Audiophile 192 PCI card in the G5. MIDI synth audio is mixed with the 192 audio externally on an analogue mixer.
All is well until I add a Linear Phase EQ plugin into the Main audio output in LP. Suddenly all the Audio is delayed slightly compared with the MIDI! If I bypass the plugin it's fine again. I thought there was a setting somewhere to compensate for this but darned if I can find it. Anyone?
I'm using LP 7.2

Go to Preferences ->Audio...->General
There you can change settings for Plug-in delay compensation.
If you want to play live, use Chanel EQ instead.
Also don't use the AdLimiter live.

Generate and synchronize 6 digital channels with differents phases/frequencies/duty cycles/...

Hello,
For some kind of tests we need to generate, with a 6534 card, 6 signals.
The 6534 has 32 digital E/S and can go up to 20MB/s !
Each channel must be independant so that it can have it's own frequency and duty cycle. But for exemple the second channel can be delayed in reference at first channel. I put an image so that you can understand better what i try to do (3 signals are shown but six are needed).
I see a lot of things on forum that are close to my probleme, but none seems to be as advanced as mine.
http://sine.ni.com/devzone/cda/epd/p/id/4683 -> 6534 doesn't have timers
http://forums.ni.com/ni/board/message?board.id=40&message.id=5167 -> Just a phase probleme
http://forums.ni.com/ni/board/message?board.id=170&message.id=261289 -> Another board
http://forums.ni.com/ni/board/message?board.id=40&message.id=5090 -> Another probleme
I contacted NI support, they send me an exemple on "patterns" but it generates frequencies that are multiple of one with no phase consideration or duty cycle.
Any idea ?
Thanks in advance for your advice and help.
Eric.
Message Edité par Eric31 le 08-10-2007 06:52 AM
Message Edité par Eric31 le 08-10-2007 06:55 AM
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At best, that's gonna be a pain in the neck with that board. If you need very precise timing for freqs, duty cycles and offsets, it gets worse. If they need to change on-the-fly, it'll be near-impossible.
1. You can only operate 1 hw-timed digital output task at a time. So all 6 signals must be part of that 1 task.
2. Thus, you need to define an output buffer representing the states of those 6 bits throughout your entire generation.
3. There's a bunch of greatest common factor and least common multiple stuff needed to figure out the right output rate and buffer size, assuming you'll want to regenerate repetitively. You first need the gcf of all the transition times to come up with the right output rate since all the transitions need to occur on some integer multiple of the output period.   You'll then need the lcm of the 6 signals' periods, combined with the output rate, to size up a buffer that can be regenerated.
4. Forming the output data array may be quite complex.   Personally, I always do my stuff with raw arrays and I know that interleaving all those signals can be quite tricky, especially if there may be an occasional simultaneous transition.   However, I suppose there's a chance that some of the digital waveform functions *might* make this step a bit simpler. I just haven't played around with that format much.
Editorial opinion: Buy a 6602. You can trigger 6 counters to start with different initial phasing, and will be able to change freq & duty cycle on-the-fly for each one independently.
Editorial opinion #2: For higher channel count apps, I'd also recommend checking out the DIO-64 board put out by Viewpoint Systems, an NI Alliance partner. It gives you much smarter hardware-timed DIO. With the NI board, there can be huge amounts of redundant info in the DO buffer. If you find that your GCF is 10 microsec, but the time between consecutive transitions is 10 millisec, you'll have to stuff 1000 identical values into your output buffer.   With Viewpoint's board, your data acq buffer *only* contains data at the transition times. Timing is controlled by delivering a separate array defining the timestamps that correspond to those transitions.
-Kevin P.

Least square linear-phase FIR filter

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Thanks in advance.

I don't believe that LabVIEW has any differentiation functions that use this algorithm. The only derivative function is located in the analyze, signal processing, time domain. You would probably have to build your own.

Linear Phase EQ and Latency?

So after reading up on all the positive tidbits of the Linear Phase EQ vs. the good old fashioned Channel EQ, I decided to start giving it a shot. I like the subtle nuances LPEQ has over CEQ and have been enjoying it.
Tonight, however, I ran into a major issue. Every instance of the LPEQ introduced some nasty latency onto the track it was put into. I tried to EQ a kick drum and the thing became so far off that I couldn't believe it. Bypassing the plug immediately sent everything back to normal.
Why does the LPEQ introduce so much latency when used? Is there any sort of workaround to lessen the effect? I bumped my buffer settings up to 512 and there wasn't a bit of difference. What's going on in the LPEQ that would make that drastic of a change? Am I missing something?

Thanks for the input, noeq.
You're weclome Brent
For the record, the latency issue started before
changing any settings. There's also no recorded
audio in the session file, all of it is soft-synths
and samplers.
I am devising a test for the synths only...without any audio in the session.I'll keep you posted on what I find.
Are you suggesting that PDC should be off to avoid
the latency issue?
At this point I am not suggesting ANYTHING.so please don't change your setup until you can find out exactly why the latency happens.By Sunday I'll have results of my tests for you to look at.
I don't think it's just my issue or a myth,
especially since tbird, iS and X all posted as having
the exact same issue with the LPEQ.
I'll be looking into this.So far with my only test,to determine default latency of Logic Plugins only,I have found it to be the case that the GuitarAmp Pro and the Space designer reverb DO have different latencies,after all other latencies have been accounted for.The Linear Phase EQ in this particular test,came out to have no latency.
Perhaps it will be a different result when I do the synth-only test.
But until I do the test,I cannot know.
Here is one of my favorite quotes,from aristotle:
"We suppose ourselves to possess unqualified scientific knowledge of a thing, as opposed to knowing it in the accidental way in which the sophist knows, when we think that we know the cause on which the fact depends, as the cause of that fact and of no other, and, further, that the fact could not be other than it is. Now that scientific knowing is something of this sort is evident-witness both those who falsely claim it and those who actually possess it, since the former merely imagine themselves to be, while the latter are also actually, in the condition described. Consequently the proper object of unqualified scientific knowledge is something which cannot be other than it is.”
— Aristotle, Posterior Analytics (Book 1 Part 2)
Cheers

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sorry, just saw that i was accidently in the snow leopard section....i reposted under the correct section. here's the link.
http://discussions.apple.com/message.jspa?messageID=12340796#12340796
sorry for the inconvenience, i was looking at other posts using search and didn't realize that i was reading the 10.6 board.
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Message was edited by: Elisabeth Hogrefe

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Hi all, I was wondering what your opinions were in regard to these two EQ's. Which one seems to be the way to go, and what are the differences between the two?
Are there some things that one would be god for over another, or is one just flat out better than the other for all things?

I have never used renaissance so im not sure about the two, but in theory any linear phase eq is better than one that is not due to the mathematical algorithms that it use to process the audio.
The way it works is that most eq's are made to be processor friendly so they have a few downfalls which is a slight phase distortion , this can be heard most when moving a peak notch along the spectrum. Most of the time this won't really be noticed but linear phase eq's resolve this problem but will consume alot more CPU, as the maths is considerably larger.
My recommendations though are to use 2 eq's which i love by PSP. NEON (linear phase) NITRO (normal), plus another great plug is Vintage Warmer2. As me my friends say: if it moves Vintage warmer. Well there u are, a short answer to ur question.LOL Thanks Stu.

Linear Phase EQ

Not hearing the difference at all to be honest.. ::: What is the use of this in Lemans terms?

You'll hear, and notice the difference immediately if you are trying to EQ a stereo recorded sound, say, like a stereo mic's acoustic guitar.
If one side of the stereo signal needs EQ's, such as if the two mics weren't the same make and model, and you try and add channel EQ to that track, the signal will become heavily out of phase. You'll hear the image shift drastically, and the timing will be off as well.
The Linear Phase EQ will keep the signal in phase, using this example.

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Hi,
is it possible to generate 2 clocks (same frequency) with different phase using PXIe-6674T ?
regards,
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hi,
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Delay with Linear Phase EQ

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