Removing 50 Hrtz Hum -Sound Forge - PC - MAGIX Community Forums Archive

Subject:Removing 50 Hrtz Hum Posted by: GLC Date:11/19/2002 8:46:07 AM Help! I am useing S F 5 and I have a 50 htz hum I want to remove from a sound file which has piano and drums on it. I have tried the EQ tool without much success can anyone tell me what tool and settings to use. Thanks Geoff.
Subject:RE: Removing 50 Hrtz Hum Reply by: Chienworks Date:11/19/2002 10:04:33 AM I usually use the Envelope tab under Process / Graphic EQ. This is only available in the full version of SoundForge, not the XP version. I set an envelope that was flat from 20 to 45Hz, dropped to -inf at 50Hz, then back to 0 at 55Hz, then flat to 20KHz. It didn't remove all the hum, but it did make it passable. Using a wider notch will remove more of the hum, but will also affect the music more too.
Subject:RE: Removing 50 Hrtz Hum Reply by: Geoff_Wood Date:11/19/2002 9:51:53 PM I have seen a plugin (sorry, can't remember name) that is a very sharp filter at 50 or 60 Hz, and related harmonics. Sound like exactly what you need - now, just need to remember what it was called.... geoff
Subject:RE: Removing 50 Hrtz Hum Reply by: Rednroll Date:11/21/2002 10:43:40 AM Perfect job for the Sonic Foundry "Noise Reduction 2.0" plugin.
Subject:RE: Removing 50 Hrtz Hum Reply by: nlamartina Date:11/21/2002 3:39:20 PM I second Noise Reduction. 60 Hz cycle hum (I'm presuming that's what you're talking about) doesn't just spit out a 60 Hz sine wave. Rather, it's noise that is distributed all up and down the frequency spectrum, so using a notch filter will do little more than slightly improve the effect. Even then, you'll be messing with integrity of the recording. Noise Reduction takes a "fingerprint" of noise, and then cross-applies that fingerprint to your recording, thus removing only the noise with that specific signature. If you can get a 30 second sample of just the noise and nothing else, that will be more than sufficient to glean a "print" from. Regards, Nick

Subject:Removing 50 Hrtz Hum

Posted by: GLC

Date:11/19/2002 8:46:07 AM

Help! I am useing S F 5 and I have a 50 htz hum I want to remove from a sound file which has piano and drums on it. I have tried the EQ tool without much success can anyone tell me what tool and settings to use.
Thanks Geoff.

Subject:RE: Removing 50 Hrtz Hum

Reply by: Chienworks

Date:11/19/2002 10:04:33 AM

I usually use the Envelope tab under Process / Graphic EQ. This is only available in the full version of SoundForge, not the XP version. I set an envelope that was flat from 20 to 45Hz, dropped to -inf at 50Hz, then back to 0 at 55Hz, then flat to 20KHz. It didn't remove all the hum, but it did make it passable. Using a wider notch will remove more of the hum, but will also affect the music more too.

Subject:RE: Removing 50 Hrtz Hum

Reply by: Geoff_Wood

Date:11/19/2002 9:51:53 PM

I have seen a plugin (sorry, can't remember name) that is a very sharp filter at 50 or 60 Hz, and related harmonics. Sound like exactly what you need - now, just need to remember what it was called....

geoff

Subject:RE: Removing 50 Hrtz Hum

Reply by: Rednroll

Date:11/21/2002 10:43:40 AM

Perfect job for the Sonic Foundry "Noise Reduction 2.0" plugin.

Subject:RE: Removing 50 Hrtz Hum

Reply by: nlamartina

Date:11/21/2002 3:39:20 PM

I second Noise Reduction. 60 Hz cycle hum (I'm presuming that's what you're talking about) doesn't just spit out a 60 Hz sine wave. Rather, it's noise that is distributed all up and down the frequency spectrum, so using a notch filter will do little more than slightly improve the effect. Even then, you'll be messing with integrity of the recording. Noise Reduction takes a "fingerprint" of noise, and then cross-applies that fingerprint to your recording, thus removing only the noise with that specific signature. If you can get a 30 second sample of just the noise and nothing else, that will be more than sufficient to glean a "print" from.

Regards,
Nick