Is there any expert out there able to help me with the above?
Just to elaborate further, if there’s anyway I am able to filter those unwanted sound except just to listen to a designated background sound from my own mobile phone recording?
I have use my sony ericsson to do a video recording. Incidentally, i manage to capture a quite personal conversation from the background of the recording which I need to verify it. I have tried listening to it even with my ear piece on at a extremely quiet place but still doesn’t help much cos the conversation was like being covered by something probably due to my normal phone recording devices.
Thank you in advance & also thanks for reading this post …
<<<Is there any expert out there able to help me with the above?>>>
There doesn’t appear to be anything above… Can you point to the original posting?
This sounds like a request of pull a clear conversation out of intense background noise or bubbling compression. Lot of that going around. In general, you don’t. There are special tricks you can pull under some very specific circumstances to sometimes pull a dialog, but there is certainly no magic bullet. Not even a slightly mysterious one.
For anybody. This is not an Audacity thing. The video editing people would kill for a tool that could do this.
[quote="kozikowski
In general, you don’t. There are special tricks you can pull under some very specific circumstances to sometimes pull a dialog, but there is certainly no magic bullet. Not even a slightly mysterious one.
For anybody. This is not an Audacity thing. The video editing people would kill for a tool that could do this.
Koz[/quote]
Hi Koz, got your msg loud & clear. None-the-less, thxs for pointing things out to me & pardon me for my posting to all, “no wonder there’s no response, hahaha…”
Guess I have to search on & hopefully, can bump into some audio wizard to help me…anyway, this is really a cool site, lots has been learned thou…cheers…
You did post to isolate one specific sound from a recording. Could a voice be this sound? All the voice isolator tools work with a stereo track. If the original recording is in mono–even if it’s in two-track mono (fake stereo) then you really are dead.
Is there such a thing that works the inverse of the noise removal algorithym? In noise removal you find a specific portion of the track representative of the noise profile that you wish to remove and then the noise removal plug in removes anyghing on the track that is similar. It seems to me that you just need to change the plug in program to discard everygthing but the represenative sound.
Voice is also only within a specific frequency range especially if the suggested plug in would request the gender of the people in the conversation and the recording mechanism of the recording (cell phone). There are effects plug ins that will modify sound to simulate an FM radio, AM radio, and a phone conversation although they may not work in reverse.
I think that it would be possible to do this with a little thinking on the correct algorithym. The success of removing he vocals may also depend on if there were other voices the same vector distance and direction as the desired voices. Every instrument has a unique set of harmonics, in addition to the main frequency, including the human voice. If audacity could remove enough noise then the listener’s brain could do the rest. The proposed plug in program would have to allow the user multiple inputs to allow human interaction to decide what to keep and what to filter.
As far as actual frequency filtering goes, No. Nature works against you there. Seriously important audio frequencies go from about 100 Hz to about 15 KHz. Voice frequencies go from 100 Hz to about 15 KHz. So no joy there.
You didn’t say whether or not you had an actual stereo show. The tools in that list all work either by spacial localization or channel cancellation. Both of those technologies require the original show to be in real stereo (violins on the left, drums on the right).
The Noise tools do work by another technology and if you want to mess with them, it is strongly recommended you use the tools in Audacity 1.3.x. Noise Suppression has its problems as well. They only work on noise or interference patterns that do not change over the course of the performance. They’re perfect for the air conditioning buzz in the background. They’re useless for suppressing the MetroBus starting up outside the window. They also depend on a perfectly clean selection of the interference without the performance. This is the Profile step. It then tries to subtract one from the other. Without that, you’re still dead.
I will agree with you that the noise tools in Audacity have their limitations but i have used them for voice and they work fine and I appreciate the programmers work. To do noise reduction for the purpose of discerning voices we are not talking about making a studio quality CD so we are really not interested in a loss of fidelity. As you said nature does work against you since the noise frequencies are in the same range as the human voice but then noise does have certain unique characteristics that voice does not. For example the Metro Bus starting up ouside will show a sharp spike in amplitude and a noise reduction algorithym can cut out all the frequencies with this amplitude spike. Plus there is no need to let the program do all the work. Anyone doing this would be willing to fiddle with it so put some interactive sliders to help the noise reduction program instead of just relying on a clean noise profile
It can be done if the right people have an interest to put their heads together and use their unique skills. Before our time, the proposal of a spreadsheet program was so far out there that it was considered artificial intelligence. Now a spreadsheet is freeware.
Do the difficult today and later the impossible will take care of itself because now the impossible has become just the difficult.
I don’t have any real skills in writing code but if anyone is interested I will help with testing and evaluation.
Kudos to both Koz & 3D, for one moment, the tunnel is getting darker but somehow, i am seeing abit of light now.
Koz: Many thxs & thumbs up to you for sharing your tricks, (buy u coffee if u r anywhere near me…haa) i’ll chk it out & see if the tools is able to help & “yes”, my request is to pull a clear conversation out of background noise from my cell phone recording.
3D: Thxs for your pointers as well & a thinking positive atitude(buy u bread, so 3 of us can enjoy the coffee & bread together…haa)… At the end, whatever the outcome is, we r just human & have to keep going & keep learning from each other…
