electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
go to the radio page Live at electro-music.com radio 1 Please visit the chat
poster
 Forum index » Online Music » Field recordings
How to avoid|remove planes trains automobiles?
Post new topic   Reply to topic Moderators: shanemorris
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Acoustic Interloper



Joined: Jul 07, 2007
Posts: 2067
Location: Berks County, PA
Audio files: 89

PostPosted: Sat Feb 02, 2013 9:09 pm    Post subject: How to avoid|remove planes trains automobiles?
Subject description: Unwanted artifacts be gone!
Reply with quote  Mark this post and the followings unread

How do folks avoid getting distant planes, trains and automobiles in their outdoor field recordings? I live in a rural area, but it is nevertheless a problem.

I imagine if one is recording a very localized sound, one could use 2 mics and use 1 to record the desired sound + noise, the other just the noise, then phase invert the latter when mixing them later. Have not tried it, should work.

What about if the target sound is more distributed? Any tricks of the trade?

Thanks.

_________________
When the stream is deep
my wild little dog frolics,
when shallow, she drinks.
Back to top
View user's profile Send private message Visit poster's website
Uncle Krunkus
Moderator


Joined: Jul 11, 2005
Posts: 4761
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1

PostPosted: Sun Feb 03, 2013 2:44 am    Post subject: Re: How to avoid|remove planes trains automobiles?
Subject description: Unwanted artifacts be gone!
Reply with quote  Mark this post and the followings unread

Acoustic Interloper wrote:
I imagine if one is recording a very localized sound, one could use 2 mics and use 1 to record the desired sound + noise, the other just the noise, then phase invert the latter when mixing them later. Have not tried it, should work.


I was thinking about this, and wondered whether it might be better to do "additive-triangulation" for very localised sounds. By recording on two, very directional mics at different distances and as wide an angle as feasible (30<r<90deg) between them. You could then delay one channel just enough to add the two signals together, thereby doubling the signal - halving the noise.
You could even get the same percieved improvement in signal, while still panning the two mics hard L/R, which would give a 1 sound from two directions, pseudo stereo depth. Any sudden wind changes will give a phasing effect. Good? Bad? Just noteworthy.

My main issue with the noisel/signal+noise approach is that the wind noise/rumble is localised to each mic, and will therefore not phase cancel. I hope that makes sense.

_________________
What makes a space ours, is what we put there, and what we do there.
Back to top
View user's profile Send private message Visit poster's website
robsol
Stream Operator


Joined: Apr 24, 2009
Posts: 2492
Location: Bristol UK
Audio files: 495

PostPosted: Sun Feb 03, 2013 8:31 am    Post subject: Re: How to avoid|remove planes trains automobiles?
Subject description: Unwanted artifacts be gone!
Reply with quote  Mark this post and the followings unread

Acoustic Interloper wrote:
I imagine if one is recording a very localized sound, one could use 2 mics and use 1 to record the desired sound + noise, the other just the noise, then phase invert the latter when mixing them later. Have not tried it, should work.


I have done this, but in a different context. You set up two identical and directional mikes facing the opposite way, and you can cancel out a lot of the background this way.

In TV and film recording they use highly directional mikes normally, also called shotgun mikes. Other mikes are designed for on location news reporting, which use different techniques to filter out background noise, and they are dear. An SM-57 or 58 will also do this for much less. They tend to color the sound a bit but are still usable. They make use of what is called the proximity effect to reduce bass the longer away the source is from the mic.

You can also use software to further reduce the noise after the fact. I often use Adobe Audition (previously Cool Edit Pro) which works quite well in many cases.

_________________
Muied Lumens Sub Forum
Bandcamp
Back to top
View user's profile Send private message
Acoustic Interloper



Joined: Jul 07, 2007
Posts: 2067
Location: Berks County, PA
Audio files: 89

PostPosted: Sun Feb 03, 2013 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the ideas! I have some experiments to plan Smile
_________________
When the stream is deep
my wild little dog frolics,
when shallow, she drinks.
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic Moderators: shanemorris
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Online Music » Field recordings
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use