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Old 17th February 2010, 08:24 PM   #441
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Sir! That's a standard 24dB filter in Pro Tools.
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Old 17th February 2010, 08:32 PM   #442
Pano is offline Pano  United States
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Well it may not be that bad.

See the graph below that compares the filtered voice signal and a 24dB/Octave filtered white noise using the same FFT method.

I wonder if the noises at the top comes from the file's conversion to MP4 and back to wave?

Regardless, I found the sharply filtered white noise to be easy to locate.
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Old 17th February 2010, 08:34 PM   #443
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Don't forget that a voice sample does not contain equal power at every frequency.

By the way, which sound files are we talking about? I posted a couple.

Last edited by markus76; 17th February 2010 at 08:41 PM.
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Old 17th February 2010, 08:51 PM   #444
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Good point!
I ran your file again with my steep filter. Still lots of junk up top. I believe that is because of the unequal power, as you say. There is a lot of energy around 700Hz in the original. If seen in linear amplitude instead of log, it sure looks different!

It was the Lowpass_24db_300Hz voice file that I ran.
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Old 17th February 2010, 08:53 PM   #445
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Quote:
Originally Posted by markus76 View Post
Don't forget that a voice sample does not contain equal power at every frequency.

By the way, which sound files are we talking about? I posted a couple.
Me quoting Markus76
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Originally Posted by markus76 View Post
I totally I agree with Earl but nonetheless there is useful spatial information in signals lower 500 Hz. Find out for yourself with the following two examples of a low-pass filtered male voice:

Low-Pass (24 db) at 150 Hz (AAC, 2 MB)

Low-Pass (24 db) at 300 Hz (AAC, 2 MB)

It also becomes pretty obvious how important higher frequencies are to understand one word at all

Best, Markus
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Old 17th February 2010, 08:57 PM   #446
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Hello,

It's not a surprise noise can be located even at low freqs. The reason is it has temporal variance. Sinusoidal do not have.

Temporal variation of the signal is reproduced more accurately the less the room messes the sound. That's why for a low freq localisation in a small rooms directivity of the source grows in importance.

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Old 17th February 2010, 09:05 PM   #447
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Hello,

It's not a surprise noise can be located even at low freqs. The reason is it has temporal variance. Sinusoidal do not have.

Temporal variation of the signal is reproduced more accurately the less the room messes the sound. That's why for a low freq localisation in a small rooms directivity of the source grows in importance.

- Elias
For clarification: So the room will reflect back higher frequencies than what hits its boundaries? Is that what you are saying?

IOW, what exactly is temporal variance? Does it mean that the later arriving signals will have less high frequencies perhaps d/t directivity variance?

thanks,
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Last edited by dantheman; 17th February 2010 at 09:22 PM. Reason: inc
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Old 17th February 2010, 10:02 PM   #448
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I did some low passed white noise testing on my system. Panning the signal left-right-left-right, etc.

At 40Hz LP (steep) I really can't easily hear if it's left or right. At 60Hz LP I can tell without much trouble. Sure, it's not as distinct as a midrange frequency, but it's certainly there. So somewhere between 60 and 40Hz things blend together in my room/my system. With noise.

With a steady sine, I had trouble at 300Hz.
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Old 17th February 2010, 10:44 PM   #449
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Then you shouldn't come here and discuss it unless you are willing to give the details. People will stop responding to you completely if you do that.
Well maybe people will stop telling what is the best use of my time. Some of my ideas are grounds for patents and I am no fool to just give them away without making sure they are open to the public to use (ie CC). If I didn't all I would be doing is giving my ideas away to the first person smart enough and with enough money to lock the rest of us out of that idea. Feel free to tell me when I'm wrong I wont be offended. But I don't like open ended guessing about what I am doing and sweeping generalizations about what can be accomplished.
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Old 17th February 2010, 10:53 PM   #450
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On bass localization. I think I have found some situations where you will mis-localize frequencies lower than 80Hz. They are subtle though so I don't know if they are that big of a problem.

But for instance if you have a tuned kick drum panned like 25% to the left and say a bass with the same harmonics panned hard right I think my brain gets confused as to which harmonics the fundamental belongs to. You get sort of a localization in between the two instruments in the worst case but at times it sounds to me like the fundamental is in both places sort of stretched in length covering the area between them.

A few times I swear I have localized 30Hz and lower at the sub with certain programmed music because there is nothing but a sine wave down there and there is a complete lack of harmonic content - or it's so low I am not picking up on it.
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