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audio denoise methodik

audio denoise Methodology



Frage von aight8:
Februar 2011

I'm just in a club but I just remembered something that I have to write jetzz simple. , an audio editing program from 2 audio sources, the audios add together so that the intersection is filtered out. for mobile phones such procedures are indeed synonymous on the fly realized by the background noise to filter out.

schöhnen evening still love community



Antwort von WoWu:

clearly a source of the phase rotate and mono output again.



Antwort von B.DeKid:

Or He now speaks of "phase reversal" method such as the Bose speakers in his helicopter offers o r s how the last World Cup the vuvuzelas "quasi" could make dumb?

So ne constant sound source can filter out How it was and is very cool - almost silence button ;-))

MfG
B. DeKid








Antwort von WoWu:

There are several methods ... and even entire Programs that do nothing else than to accomplish such sound problems.



Antwort von B.DeKid:

That's why I asked yes - because I have 2 friends who are really fit wenns to sound goes - and the really cool if filter out the quasi-NEN vacuum cleaner and you only hear the call Mom! ;-))

Dependent heli and I know of containing the Bose speakers fitern quasi the "Schrabb, Schrabb, Schrabb" get out and you only nooch the voices of the pilots heard - is synonymous a lot :-)

Just as I let me explain it - it turns containing NEN peak around and swallow these so - what's just come under the same noise sources.

But I'll just go hard to assume that it is here for the right professionals that can explain much better than both of us - or WoWu -?)

MfG
B. DeKid



Antwort von Axel:

"B. DeKid" wrote:
But I'll just go hard to assume that it is here for the right professionals that can explain much better than both of us - or WoWu -?)


Maybe it helps just that I am not a professional, this is the simple explanation:

Background noise can be a second - or what always synonymous - to isolate and create a so-called "fingerprint" (Noise print) it. This sample rate can be on any audio clip to be used as a Choice. Most if not all audio programs have a function to remove noise or something.

What happened: The pattern that you have previously entered, serves as a key, such as green for green screen. It says nothing about what happens after that. A key is a Choice.

If this frequency is now easy car to 100% would be removed, would have an ugly hole in the frequency spectrum. Under-and overtones of the desired frequencies (including the aptly known as harmonics) could - Paff! - Cut off. Not only an audiophile, but not quite every dove claps his hands over his head.

At a minimum, there needs to be adjustable tolerances, which are adjusted to Ohrenmaß, the analogy to Farbkeying fit again. Even after that "spill" (remnants of unwanted frequencies) has left. And, as we know of the video may not be synonymous a spill suppression auto, if you will not have the whole picture magenta.

So better to filter manual. Many find this difficult non-sound engineers, because they do not have the figures for the frequency of spontaneous heights to do something with what is heard. Endless experimenting with, and we know after ten minutes no longer whether the result verfilterte now at all is better than the original. Doof.

For me, the penny dropped with this zum Bild
Oben sehen wir die gewohnte waveform, unten die Frequenzdarstellung. Während man hört, sieht man, what you hear. Not only can you for a numerical filtering, the frequency level on the y-coordinate of the right) read (you may even directly with s.Photoshop reminiscent selection tools (lasso, in the old demo version, at least it was synonymous the Razzelfummi) s.den problem areas . rumdoktorn

Best of all, a few hours of hearing and seeing a parallel world they know suddenly - just about at least - which frequency band is in a sound.



Antwort von WoWu:

Three common methods are in the majority of cases.
Gating, which is based on that content (voice), a background noise level in excess.
Does no one is either lowered the level or an adjustable filter to limit the fall in the high range, noise reduction. This is synonymous with a signal (mono).

Phase reversal requires two signals. Here, the content of one signal by 180 ° phase is subtracted from the other signal and the summation no longer audible. Problem is that is cut in broadband content synonymous with the actual useful signal, because no substantive weighting takes place.
This requires the close proximity of the two audio recordings, for a term (working distance) between the signals, the low efficiency and not all the frequencies can be filtered.

The filtering process, with the frequency positions analyzed and limited disturbing frequency content simple.

Programs are now combining it, as has been written of Axel, producing a mixture of these methods, so make an analysis and use the tools along with the requirements and. here may be synonymous additionally intermittent effects are eliminated and synonymous reactions are added to specific sides (click). Or parts of the signals are on a delay on the time axis changed to compensate for times.

Also different envelopes are included.

So here comes yet the time element comes into play.

These Programs are quite effective. But they are all based on the level, frequency and the temporal signal behavior of the sound events.
Who can deal with the three components, we can already offer good solutions.



Antwort von shodushitanaka:

"B. DeKid" wrote:
So ne constant sound source can filter out How it was and is very cool - almost silence button ;-))

Go easy even. I hunt as a spoken text accessible by the software Audacity. 2sekündigen you make a "fingerprint" of the constant sound source (eg background noise, now no music, or something ...) and hey presto, you have only the clear voice.



Antwort von shodushitanaka:

"B. DeKid" wrote:
So ne constant sound source can filter out How it was and is very cool - almost silence button ;-))

"Axel" wrote:
Background noise can be a second - or what always synonymous - to isolate and create a so-called "fingerprint" (Noise print) it.

eg with the free "Audacity"



Antwort von B.DeKid:

Thank you I've learned synonymous directly again NEN bissel more.

MfG
B. DeKid




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