To follow up my previous thread below:
Finally, I'm started converting my 15 years old Hi8 S-video footage to
DV, among other a relation-familiy meeting. Part of this video contains
speeches where a separate, wireless mic/amplifier/loadspeaker system"
was used. That is "out of my control" and I had to record this happening
adhoc on some distance, just with the camcorder's built-in mic and using
video/audio zoom.
Yes, this typically results in the well known and already mentioned
"zoom or direction stereo mic" decreasing bass and increasing treble"
The recorded speakers voice sounds artificial "thin" and "sharp". During
playback on a TV, the voice sounds some more natural (better) by
increasing the bas and decreasing the treble using these TV audio
controls. Maybe the voice still contains some weak bas part, but that it
is lowered or cut off compared with the treble part.
I'm a beginner on both audio and video NLE, and not quite ready to start
exploring Cinelerra's or other free audio tools yet. But I wonder:
Will it be difficult or relative easy to move the complete voice to a
lower frequency band, or alternatively, just increase the lower
frequency band of the voice?
----------------
Terje J. Hanssen
On Tue, 01 Jan 2008 21:20:15 -0800 Craig Lawson wrote:
Terje,
Try Cinelerra filters "EQ Parametric" and "DenoiseFFT".
For DenoiseFFT, you'll need an uninterrupted noise sample, longer is
better (see the filter settings for exact length). Paste the noise
sample at the beginning of your audio tracks immediately preceding your
valued content (exclude from rendering with in/out points or markers).
Too much Denoise power adds unpleasant artifacts to your audio. My
experience so far is that DenoiseFFT can improve the clarity somewhat,
but forget about perfection. Good luck!
Craig.
Stefan de Konink wrote:
> On Tue, 1 Jan 2008, Terje J. Hanssen wrote:
>
>
>> Typical audio problems when recorded with the built-in mic on camcorders
>> can be:
>>
>> - outdoor wind noise (too weak person voice)
>>
>
> This is hard to compensate. Noise is generally a distribution of 'sound'
> on all frequencies. Some techniques like selecting a speakers speech
> frequency can be done with tools like 'Praat'. But seriously, these things
> are beginner errors, and should be teached how to avoid, not mask...
>
>
>> - "zoom or direction stereo mic" decreasing bass and increasing treble
>>
>
> I think any serious Linux audio tool can do this. Audicity[1], Praat[2],
> Ardour[3]...
>
>
>> - other background noise in between (too weak voice)
>>
>
> If you are able to design or use a designed filter (mathematically) you
> can use it within Praat. So export a wav, process and save. Maybe in the
> future Praat will support video, but now there are other priorities ;)
>
>
> Stefan
>
> [1] audicity.sf.net
> [2] praat.org
> [3] ardour.org
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