RE: [microsound] [OT]? Hiss reduction recommendations

[mark <mark@xxxxxxxxxxxxx>]

I recently had to do some similar cleaning - the waves restoration bundle is
very good - as is the noise reduction tool in CoolEdit Pro. These both
"sample"
the noise (take do an FFT "image" of it") and try and remove it using FFT.
You
can get odd artefacts if you try and remoe too much.  Its a pain staking
(and
boring) job.

 A good compressor should help with the volume. Noise gates have to be used
with
care on speech - the human mind can edit out a certain level of constant
background noise - gating it constanltly brings the signal back to you
attention.

cheers

mark

-----Original Message-----
From: Bill Jarboe [mailto:billjarboe@xxxxxxxxxxxxx]
Sent: 03 March 2002 05:56
To: microsound
Subject: Re: [microsound] [OT]? Hiss reduction recommendations


on 3/02/02 10:56 PM, Michael Bleming at mbleming@xxxxxxxxxxx wrote:

> Hi I hope this is not too off topic, if it is, please refer me to a list
> better suited to the question...anyway... I have a friend who is working
on a
> documentary to complete his masters requirements...he's ran into a wall in
> regards to the audio quality of some of the interviews. A number of the
> interviews suffer from serious hiss issues coupled with low volume levels.
> What is the best way to reduce this extreme hiss and raise the level of
the
> audio as well? The interviews were one shot deals and cannot be recorded
> again. The poor audio quality sticks out like a sore thumb and he'd like
to
> find a way to clean it up, cheaply if possible. I'm aware of a number of
> restoration programs but I have no experience with them...is there a way
to
> cut the hiss while raising the level that will not cost an arm and a leg?
> Sorry if this is too far off topic and thanks for ANY help you can give.
> Michael
>
 I don't know what platform your friend is working on. I have found that the
best way to do the hiss removal thing is to find an app. that supports vst
plug ins and then try changing the phase first ( this can cancel hiss in
some cases) with something like imager <http://sonomatics.com/>for mac.
After that try a compressor and a  noise gate , maybe in tandem with
selective e.q..

 Waves <http://www.waves.com/> offers a restoration bundle demo , I haven't
tried it yet myself(could be fun).



                                  Bill


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