16 Apr
2007
16 Apr
'07
11:50 a.m.
I'm trying ot clean up a WAV file that has a low sounding rumble, motor-like
sound, sort of up and down. It's lower than the bass line. I'm finding this
hard to describe in words. I'm using the Gnome Wave Cleaner and its got
a notch filter but I don't know what frequency to set it for. I do know people
hear from about 20 Hz to 20,000 Hz, on a good day, so would maybe 50 Hz
to 100 Hz would be a good start?
16 Apr
16 Apr
12:13 p.m.
New subject: rumble, motor-like sound. What frequency to set notch filter?
millward wrote:
I'm trying ot clean up a WAV file that has a low
sounding rumble, motor-like
sound, sort of up and down. It's lower than the bass line. I'm finding this
hard to describe in words. I'm using the Gnome Wave Cleaner and its got
a notch filter but I don't know what frequency to set it for. I do know people
hear from about 20 Hz to 20,000 Hz, on a good day, so would maybe 50 Hz
to 100 Hz would be a good start?
"up and down" sounds dynamic, so you either need a wider range or
several. The best way is empirical: try a wide range and a deep cut of
where you believe the sound to be worst. After that, adjust it narrower
and listen for the offending sound and also move the center freq around
until you hit it. Then experiment with the deepness until you get it to
where you are happy with the compromise (compromise because you are
affecting the sound of the program, of course.)
--
brad fuller
http://www.Sonaural.com/
+1 (408) 799-6124
1:39 p.m.
New subject: rumble, motor-like sound. What frequency to set notch filter?
On Mon, Apr 16, 2007 at 08:49:19AM -0500, millward wrote:
I'm trying ot clean up a WAV file that has a low
sounding rumble, motor-like
sound, sort of up and down. It's lower than the bass line. I'm finding this
hard to describe in words.
Can you post a small sample somewhere?
I'm using the Gnome Wave Cleaner and its got
a notch filter but I don't know what frequency to set it for. I do know people
hear from about 20 Hz to 20,000 Hz, on a good day, so would maybe 50 Hz
to 100 Hz would be a good start?
IF you're lucky, it might be that the rumble really is completely
lower than the bassline. In that case, I'd try a very steep highpass
filter first. Set it to just below the lowest fundamental in the
bassline and see if that helps.
If the bassline is from a bass guitar, low E fundamental is about 41
Hz and low B fundamental on a 5-string is about 31 Hz. (Handy chart
here: http://en.wikipedia.org/wiki/Piano_key_frequencies).
Typically most of the energy from a bass guitar is in the first few
overtones, so you might also be able to apply some gradual rolloff of
frequencies below about 80 Hz.
--
Paul Winkler
http://www.slinkp.com
6376
days inactive
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days old
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2 comments
3 participants
participants (3)
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Brad Fuller -
millward -
Paul Winkler