Re: [LAU] denoising audio files

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: Kevin Cosgrove <kevinc@...>
Cc: <linux-audio-user@...>
Date: Thursday, May 24, 2012 - 2:20 pm

--bcaec55240bef98cf504c0c8f2e2
Content-Type: text/plain; charset=ISO-8859-1

On Thu, May 24, 2012 at 10:04 AM, Kevin Cosgrove wrote:

>

This is standard practice for anyone that does restoration work. What Fons
has said, not to demean it at all, is common knowledge for those that use
the tools. Your standard 4 tools are a broadband de-noiser, used for
relatively constant noises in the background, often a multiband expander at
least when dealing with realtime applications. A De-Buzzer designed to
take at periodic noises that have relatively high harmonic content at
regular intervals, primarily a series of carefully designed notch filters.
A De-Hum which is designed to take out periodic noise without much harmonic
content. And a De-Clicker designed to remove clicks and pops you get from
vinyl and other sources (ie. Dust on Tape going over the heads sometimes).
But also as he mentioned you can get more specialized tools as well and yes
some will go so far as to allow you to focus on specific spectral areas, if
anyone has seen Audition this does this, but really I am referring to much
more specialized tools that cost much more money, like Algorithmix
Renovator.

There is an 'ok' article on the basic process located on CEDAR Audio's
website, who are pretty much the standard in the industry to my knowledge
for realtime noise reduction(As compared to Algorithmix reNovate which is
offline/non-realtime)

http://www.cedaraudio.com/
Click on "About Audio Restoration"

At least it covers the basics pretty well if you click through to info on
the various tools at the bottom of the page.

Seablade

--bcaec55240bef98cf504c0c8f2e2
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

On Thu, May 24, 2012 at 10:04 AM, Kevin =
Cosgrove <kevinc@cosgroves.us> wrote:

On 24 May 2012 at 13:52, Fons Adriaensen <fons@linuxaudio.org> wrote:

> So that's at least three cases

Other cases I've faced are:

4. Power line hum getting into the recording system.
5. Acoustic hum from florescent lights.
6. Noise from photocopier drum warming getting into
=A0 the power circuit with chirps every 12.6 seconds.

I think Fons is onto something, find the cases for noise
reduction, study the noise content, and devise or apply a
suitable noise algorithm.
This is standard practice for anyone that does re=
storation work.=A0 What Fons has said, not to demean it at all, is common k=
nowledge for those that use the tools.=A0 Your standard 4 tools are a broad=
band de-noiser, used for relatively constant noises in the background, ofte=
n a multiband expander at least when dealing with realtime applications.=A0=
A De-Buzzer designed to take at periodic noises that have relatively high =
harmonic content at regular intervals, primarily a series of carefully desi=
gned notch filters.=A0 A De-Hum which is designed to take out periodic nois=
e without much harmonic content.=A0 And a De-Clicker designed to remove cli=
cks and pops you get from vinyl and other sources (ie. Dust on Tape going o=
ver the heads sometimes).=A0 But also as he mentioned you can get more spec=
ialized tools as well and yes some will go so far as to allow you to focus =
on specific spectral areas, if anyone has seen Audition this does this, but=
really I am referring to much more specialized tools that cost much more m=
oney, like Algorithmix Renovator.
There is an 'ok' article on the basic process located on CEDAR =
Audio's website, who are pretty much the standard in the industry to my=
knowledge for realtime noise reduction(As compared to Algorithmix reNovate=
which is offline/non-realtime)
http://www.cedaraudio.com/Click on "About Audio Restoration"At least it covers th=
e basics pretty well if you click through to info on the various tools at t=
he bottom of the page.
=A0=A0=A0=A0=A0=A0=A0 Seablade

--bcaec55240bef98cf504c0c8f2e2--

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
[LAU] denoising audio files, Iain Mott, (Mon May 21, 10:04 am)
Re: [LAU] denoising audio files, Julius Smith, (Wed May 23, 5:25 am)
Re: [LAU] denoising audio files, Ricardus Vincente, (Mon May 21, 2:04 pm)
Re: [LAU] denoising audio files, Fons Adriaensen, (Mon May 21, 9:48 pm)
Re: [LAU] denoising audio files, Jaromír Mikeš, (Thu May 24, 10:33 am)
Re: [LAU] denoising audio files, Georg Holzmann, (Thu May 24, 11:05 am)
Re: [LAU] denoising audio files, Hartmut Noack, (Wed May 23, 9:44 pm)
Re: [LAU] denoising audio files, Fons Adriaensen, (Thu May 24, 1:52 pm)
Re: [LAU] denoising audio files, Kevin Cosgrove, (Thu May 24, 2:04 pm)
Re: [LAU] denoising audio files, Thomas Vecchione, (Thu May 24, 2:20 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Thu May 24, 5:46 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Tue May 22, 3:04 am)
Re: [LAU] denoising audio files, david, (Tue May 22, 8:37 am)
Re: [LAU] denoising audio files, Ricardus Vincente, (Tue May 22, 1:32 pm)
Re: [LAU] denoising audio files, david, (Tue May 22, 7:40 pm)
Re: [LAU] denoising audio files, Thomas Vecchione, (Tue May 22, 10:36 am)
Re: [LAU] denoising audio files, david, (Tue May 22, 7:43 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Tue May 22, 7:59 pm)
Re: [LAU] denoising audio files, david, (Wed May 23, 5:09 am)
Re: [LAU] denoising audio files, Folderol, (Tue May 22, 7:53 pm)
Re: [LAU] denoising audio files, Thomas Vecchione, (Wed May 23, 5:18 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Tue May 22, 1:57 pm)
Re: [LAU] denoising audio files, Emanuel Rumpf, (Tue May 22, 2:36 pm)
Re: [LAU] denoising audio files, Thomas Vecchione, (Tue May 22, 3:11 pm)
Re: [LAU] denoising audio files, Thomas Vecchione, (Tue May 22, 3:12 pm)
Re: [LAU] denoising audio files, hermann, (Tue May 22, 2:29 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Tue May 22, 3:15 pm)
Re: [LAU] denoising audio files, Ricardus Vincente, (Mon May 21, 9:57 pm)
Re: [LAU] denoising audio files, Lorenzo Sutton, (Tue May 22, 7:22 am)
Re: [LAU] denoising audio files, Thomas Vecchione, (Tue May 22, 10:35 am)
Re: [LAU] denoising audio files, Lorenzo Sutton, (Mon May 21, 11:43 am)
Re: [LAU] denoising audio files, Julien Claassen, (Mon May 21, 10:15 am)
Re: [LAU] denoising audio files, Georg Holzmann, (Mon May 21, 10:11 am)
Re: [LAU] denoising audio files, Alexandre Prokoudine, (Mon May 21, 10:08 am)
Re: [LAU] denoising audio files, Thomas Vecchione, (Mon May 21, 5:17 pm)
Re: [LAU] denoising audio files, Kevin Cosgrove, (Wed May 23, 12:22 am)