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Posted by Richard Crowley on 10/05/71 11:38
"P.C. Ford" wrote ...
> "Richard Crowley" 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.
Your audio guru may have not been completely forthcoming
on the exact scope of that little "if". The problem comes
when the noise is in the same frequency range as the signal
of interest. No filtering can affect one without an equal
effect on the other.
I'd re-record the track. With a different narrator if
necessary. In the long run it is simpler than trying
to remove broadband noise. Unless the customer
can be convinced to live with the artifacts.
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