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how to extarct autofocus motor noise from audio file

 
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angelman



Joined: 05 Oct 2009
Posts: 9

PostPosted: Thu Jul 14, 2011 9:48 am    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

Any suggestions on the best way to extract or suppress the autofocus motor noise from the audio I have taken from a video, if possible.
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Thu Jul 14, 2011 2:23 pm    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

Do you have a clean sample of the autofocus noise? If so, see if there
are discrete frequencies that you can pull out. You can also try the
denoising algorithm -- I think in theory it should work but in practice,
you may just be able to decrease it. (I am assuming it is a variant of
the Wiener algorithm,)

Chuck

On 7/14/11 4:48 AM, angelman wrote:
Quote:
Any suggestions on the best way to extract or suppress the autofocus motor noise from the audio I have taken from a video, if possible.




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Martin Hairer
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Joined: 08 Nov 2006
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PostPosted: Thu Jul 14, 2011 2:27 pm    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

Quote:
(I am assuming it is a variant of the Wiener algorithm,)

Correct. It may work pretty well if the noise sounds "constant"...
Regards,

Martin

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angelman



Joined: 05 Oct 2009
Posts: 9

PostPosted: Fri Jul 15, 2011 1:12 am    Post subject: settings Reply with quote

Thanks for quick reply.
I have reduced it quite a bit using these settings Short FFT, smooth,sensitivity 60%. the voice is a bit more guttural but who can understand an aussie accent anyway.
Any suggestions on further improvement . say; If I amplify it all use the settings and drop it back?
I may put in some background music too. I personally find the noise really annoying. I hate fridge noises too.
Would this mean the camera is not so good. thanks again.
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Fri Jul 15, 2011 2:05 am    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

I doubt if amplifying anything is likely to help. Background music is
always an option. On CarTalk they always talk of turning the radio up
louder to drown out a noise.

I would guess that it says nothing about the camera; you just
shouldn't use a mike on a camera with autofocus. You might find that if
you used a cardiod mike and moved a foot or 2 from the camera, the noise
would go way down. Remember every time you see a live news feed on TV,
they have mikes plastered right in the face of the speakers and the
cameras a distance away.

Chuck

On 7/14/11 8:12 PM, angelman wrote:
Quote:
Thanks for quick reply.
I have reduced it quite a bit using these settings Short FFT, smooth,sensitivity 60%. the voice is a bit more guttural but who can understand an aussie accent anyway.
Any suggestions on further improvement . say; If I amplify it all use the settings and drop it back?
I may put in some background music too. I personally find the noise really annoying. I hate fridge noises too.
Would this mean the camera is not so good. thanks again.




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angelman



Joined: 05 Oct 2009
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PostPosted: Fri Jul 15, 2011 2:20 am    Post subject: Reply with quote

thanks.
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angelman



Joined: 05 Oct 2009
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PostPosted: Fri Jul 15, 2011 3:30 am    Post subject: camera microphone Reply with quote

I know this is off topic but does the microphone have be plugged in to the camera to synch the sound and video. there is no external mike jack on it. Guess I will have to research this.
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Gerard Bik



Joined: 10 Nov 2006
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PostPosted: Fri Jul 15, 2011 8:47 am    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

In this wonderful digital age you can use two independent camera's or a camera and a digital soundrecorder and sync the sound afterwards in iMovie or another editor.
Even 90 minute recording show up perfectly in sync from start to finish. Probably has to do with timecode or something.
Coming from the analog tape age this is like magic to me. Wink

If cash is not a problem, invest in a microphone/recorder like one of the Zoom recorders. (Or a better camera)

Gerard


Quote:
I know this is off topic but does the microphone have be plugged in to the camera to synch the sound and video. there is no external mike jack on it. Guess I will have to research this.


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CDJonah_alt



Joined: 15 Mar 2007
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PostPosted: Fri Jul 15, 2011 2:16 pm    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

And I do love my zoom H2 recorder.

Chuck

On 7/15/11 3:28 AM, Gerard Bik wrote:
Quote:
In this wonderful digital age you can use two independent camera's or a camera and a digital soundrecorder and sync the sound afterwards in iMovie or another editor.
Even 90 minute recording show up perfectly in sync from start to finish. Probably has to do with timecode or something.
Coming from the analog tape age this is like magic to me. Wink

If cash is not a problem, invest in a microphone/recorder like one of the Zoom recorders. (Or a better camera)

Gerard


Quote:
I know this is off topic but does the microphone have be plugged in to the camera to synch the sound and video. there is no external mike jack on it. Guess I will have to research this.

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MrEes



Joined: 10 Nov 2006
Posts: 64
Location: Finger Lakes, NY, USA

PostPosted: Fri Jul 15, 2011 7:58 pm    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

+1. And I recently read an announcement of H2n (or something like that) with 5 mics
that's supposed to be in the same-ish price range.

m.
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composer &c.

Charles Jonah expressed with much marked refinement of phraseology:
Quote:
And I do love my zoom H2 recorder.


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angelman



Joined: 05 Oct 2009
Posts: 9

PostPosted: Sat Jul 16, 2011 12:22 am    Post subject: Reply with quote

Thank you. You people are very helpful. I should come here more often.
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angelman



Joined: 05 Oct 2009
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PostPosted: Sat Jul 16, 2011 3:16 am    Post subject: return sound to video on mac Reply with quote

My next question is after I have converted the sound track what is best program to return the sound tot he video on a mac.
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Gerard Bik



Joined: 10 Nov 2006
Posts: 353

PostPosted: Sat Jul 16, 2011 11:29 am    Post subject: how to extarct autofocus motor noise from audio file Reply with quote

In my experience the easiest is the old iMovie HD (version 6).
But it can be done in any video editor.
Gerard



Quote:
My next question is after I have converted the sound track what is best program to return the sound tot he video on a mac.

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