Experts help with Noise Reduction on Amplified Sound -Sound Forge - PC

Subject:Experts help with Noise Reduction on Amplified Sound Posted by: doormill Date:4/22/2003 4:44:37 PM I have a sound file from a wedding where the Chaplin accidently unplugged the microphone from the camera during the ceremony. I'm able to boost the volume thru Sound Forge 6 to get more than adequate clarity from the voices recorded on the camera after it unplugged. Of course when I do this, I get a very constant loud hiss sound thru the whole file. Almost like water spraying or air leaking from a tire. I don't have Noise Reduction yet but am thinking about getting it. If I try the demo, what are the best settings to get rid of the hiss as much as possible while maintaining the voice. Thanks in advance.
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: MJhig Date:4/22/2003 6:37:00 PM Follow the directions. They are straight forward and effective. In Sound Forge highlight a small section of noise only > launch NR > choose a preset that relates to your PC > click Capture Noiseprint > click Preview > adjust dB slider until most of the noise is gone > R-click on the lower right of the plug-in and select all data > listen to the results and adjust. MJ
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: Chessmaster Date:4/23/2003 6:27:29 AM You have a possible problem here, noise reduction may or may not work. Because the hiss maybe mixed in with the same level of sound and frequency as the actual voice, so noise reduction may work for pops and clicks, but constant hiss is much more harder to clear up. Try the demo, before the investment for maybe a one off project.
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: doormill Date:4/23/2003 12:20:43 PM Thanks for quick responses. I'll try it.
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: doormill Date:4/24/2003 12:05:52 PM Maybe somebody can tell me how this helped but I ran it thru Track EQ/vocal cut and it was a 500% help. Hiss dropped by 75%. Not sure why. I discovered this quite by accident. Have a good day
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: Rednroll Date:4/25/2003 10:59:06 AM "You have a possible problem here, noise reduction may or may not work. Because the hiss maybe mixed in with the same level of sound and frequency as the actual voice, so noise reduction may work for pops and clicks, but constant hiss is much more harder to clear up." Noise reduction is IDEAL for hiss noise, because hiss noise is a constant background noise and can therefore be removed. Noise reduction works on the premisis that you sample the noise by itself as described previously and then reduce THAT noise throughout the entire wave file. The Noise reduction analyzes the frequency content of that sample and learns what is referred too as a "noise print". Yes, within that noise print may be some frequencies of the actual voice may be present. You should therefore start with a higher setting in the "reduce noise by" slider (ie -50dB) and then lower this slider if too much of what you want to keep is being effected. Noise reduction should be able to remove background noise like hiss by as much as -30dB, without effecting the voice. Which in most cases will give you acceptable results. Chessmaster, have you ever even used noise reduction for background noise removal like hiss before? "Maybe somebody can tell me how this helped but I ran it thru Track EQ/vocal cut and it was a 500% help. Hiss dropped by 75%." You can remove a lot of hiss noise using an EQ and notching out the frequency that the noise is loudest at, which will sometimes give you acceptable results like you experienced. The Vocal remover works by putting the Left channel and right channel 180 degrees out of phase with each other and also boosting frequencies that the vocals are not present in and cutting frequencies that the vocals are present in. Therefore you get noise cancelation due to the 180 degree phase shift of anything panned dead center (ie common noise between the L/R channels) and you get an EQ reduction at a frequency the noise be louder at. Basically, you found out there is more than one way to skin a cat, but it might just depend on the size of the cat the next time you try it, and this technique might not work.
Subject:RE: Experts help with Noise Reduction on Amplified Sound Reply by: doormill Date:4/25/2003 12:32:34 PM Thanks for the answers.

Subject:Experts help with Noise Reduction on Amplified Sound

Posted by: doormill

Date:4/22/2003 4:44:37 PM

I have a sound file from a wedding where the Chaplin accidently unplugged the microphone from the camera during the ceremony. I'm able to boost the volume thru Sound Forge 6 to get more than adequate clarity from the voices recorded on the camera after it unplugged. Of course when I do this, I get a very constant loud hiss sound thru the whole file. Almost like water spraying or air leaking from a tire. I don't have Noise Reduction yet but am thinking about getting it. If I try the demo, what are the best settings to get rid of the hiss as much as possible while maintaining the voice.

Thanks in advance.