background noise cancellation -Sound Forge - PC - MAGIX Community Forums Archive

Subject:background noise cancellation Posted by: shobbs Date:5/6/1999 4:56:20 PM We recently conducted interviews in an environment where we had the low hum of the building generator as background noise. I seem to recall some discussion about recording only the ambient noise with a mic having reverse polarity to cancel the ambient noise. After the interview we recorded several minutes of ambient sound in hopes of trying this fix. Can the ambient sound be reduced by converting to .wav file and then inverting the signal? Or is there another technique to use to reduce the ambient noise besides EQ? Thanks, Steve
Subject:Re: background noise cancellation Reply by: slappy Date:8/23/1999 10:14:00 PM try mapping the BG noise with SF noise reduction plug-in (ya gotta have at least a second during the session where no one was talking or anything). This is usualy quite effective with reducing consistent BG noise. slappy steve wrote: >>We recently conducted interviews in an environment where we had the low hum of the building >>generator as background noise. I seem to recall some discussion about recording only the ambient >>noise with a mic having reverse polarity to cancel the ambient noise. After the interview we recorded >>several minutes of ambient sound in hopes of trying this fix. Can the ambient sound be reduced by >>converting to .wav file and then inverting the signal? Or is there another technique to use to reduce >>the ambient noise besides EQ? >> >>Thanks, >>Steve
Subject:Re: background noise cancellation Reply by: slappy Date:8/23/1999 10:20:00 PM oh - the inversion method - if you conducted the ENTIRE session without moving the mic and the BG noise remained COMPLETLEY consistent throughout - you might have a chance - but even then you have to match the cycle of the machine sounds exactly (in placement and in length)create a lenght as long as your program then invert then mix... I'd try the NR plug-in :) steve wrote: >>We recently conducted interviews in an environment where we had the low hum of the building >>generator as background noise. I seem to recall some discussion about recording only the ambient >>noise with a mic having reverse polarity to cancel the ambient noise. After the interview we recorded >>several minutes of ambient sound in hopes of trying this fix. Can the ambient sound be reduced by >>converting to .wav file and then inverting the signal? Or is there another technique to use to reduce >>the ambient noise besides EQ? >> >>Thanks, >>Steve

Subject:background noise cancellation

Posted by: shobbs

Date:5/6/1999 4:56:20 PM

We recently conducted interviews in an environment where we had the low hum of the building
generator as background noise. I seem to recall some discussion about recording only the ambient
noise with a mic having reverse polarity to cancel the ambient noise. After the interview we recorded
several minutes of ambient sound in hopes of trying this fix. Can the ambient sound be reduced by
converting to .wav file and then inverting the signal? Or is there another technique to use to reduce
the ambient noise besides EQ?

Thanks,
Steve

Subject:Re: background noise cancellation

Reply by: slappy

Date:8/23/1999 10:14:00 PM

try mapping the BG noise with SF noise reduction plug-in (ya gotta
have at least a second during the session where no one was talking or
anything). This is usualy quite effective with reducing consistent BG
noise.

slappy

steve wrote:
>>We recently conducted interviews in an environment where we had the
low hum of the building
>>generator as background noise. I seem to recall some discussion
about recording only the ambient
>>noise with a mic having reverse polarity to cancel the ambient
noise. After the interview we recorded
>>several minutes of ambient sound in hopes of trying this fix. Can
the ambient sound be reduced by
>>converting to .wav file and then inverting the signal? Or is there
another technique to use to reduce
>>the ambient noise besides EQ?
>>
>>Thanks,
>>Steve

Subject:Re: background noise cancellation

Reply by: slappy

Date:8/23/1999 10:20:00 PM

oh - the inversion method - if you conducted the ENTIRE session
without moving the mic and the BG noise remained COMPLETLEY consistent
throughout - you might have a chance - but even then you have to match
the cycle of the machine sounds exactly (in placement and in
length)create a lenght as long as your program then invert then mix...

I'd try the NR plug-in :)

steve wrote:
>>We recently conducted interviews in an environment where we had the
low hum of the building
>>generator as background noise. I seem to recall some discussion
about recording only the ambient
>>noise with a mic having reverse polarity to cancel the ambient
noise. After the interview we recorded
>>several minutes of ambient sound in hopes of trying this fix. Can
the ambient sound be reduced by
>>converting to .wav file and then inverting the signal? Or is there
another technique to use to reduce
>>the ambient noise besides EQ?
>>
>>Thanks,
>>Steve