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Posted by Mike Kujbida on 10/05/48 11:38
P.C. Ford wrote:
> On Fri, 27 Jan 2006 17:45:44 -0800, "Richard Crowley"
> <rcrowley@xpr7t.net> wrote:
>
>> "Steve King" wrote ...
>>> I've found that AC air noise is more like pink noise.
>>> Where do you center that notch filter? I'd like to know.
>>> I haven't been successful with EQ on blower/air noise.
>>
>> That has been my experience, also. HVAC/fan noise is
>> rarely simple enough for notch filtering to be effective.
>
> Frequency analysis in Sound Forge suggests that the sound's frequency
> extends from low to high; it's very broad. If I am reading the tool
> correctly it is a bit louder at the lower frequencies.
>
> My sound guru says that the lower frequency are the most troublesome.
> If one can get rid of them, one is better off. He says to use a high
> pass filter. He suggests that one needs to experiment with the range
> of frequencies. He said that he would then pump up the mid range
> frequencies.
>
> He said to use the high pass filer to do this. Does someone know the
> analogous tool in Sound Forge 6? I am a dummy. Only used Sound Forge
> for simple stuff.
>
> By the way, this is essentially a video of a PowerPoint presentation.
> PP slides and talking head. (I know, I never let them do it again.)
> However, I converted the PowerPoint successfully with Camtasia.
> (Client bought it with no problem.) Hardware conversion was done as
> well but it was muddly and blurry. Not close to useable.
For Sound Forge, go Process - EQ. There are 3 different EQs there for you
to try. Since, as you said, fan noise is almost full spectrum, I'd
concentrate on the voice range and dropping everything else around it. For
this, try the band pass in the Parametric EQ option.
For Powerpoint, I've had my best success at transferring it by using a scan
converter with video outputs on it. Obviously, the better the unit, the
better the quality.
Mike
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