How do I remove noise interference from audio -Sound Forge - PC

Subject:How do I remove noise interference from audio Posted by: ola Date:10/2/2007 4:09:43 AM I am using SF9 to record audio messages from our church services. Sometimes the recording is perfect, but sometimes it is not. When the recording includes unwanted noise and interference, I would like to know what I can do to clean up the audio. The interference is most noticeable and unbearable when recording voices from more than one microphone. In the current set up, we connect a creative sound card to a laptop running Windows Vista and the sound card to a Calsbro mixer output channel, using a USB cable. Speakers and microphones are also connected to the appropriate mixer channels. For an example of a mostly good output: Visit http://www.praise-church.com/AudioDownload.html download and listen to the first file: "Wisdom_And_Counsel_For_A_Better_Life" You can hear some interference noise (such as I would like to be able to remove) near the end of this recording. For a recording that is not so good because of interfering noises, when more than one mic is in use, please download and listen to the following file: http://www.praise-church.com/Prayer_And_Intercession_For_Broxbourne_06.mp3 Your help to overcome this problem will be greatly appreciated. Ola Stevens, Praise Church
Subject:RE: How do I remove noise interference from a Reply by: rraud Date:10/2/2007 9:37:25 AM "Wisdom_And_Counse" clip: 1. A foam pop filter would help with the plosives. (breath noise on Ps and B's, ect.) Ask the speaker back off the microphone a little.... 2. Reduce the mixer's input channel gain. (preamp) 3. A different type microphone would help . I would recommend a Shure SM-58 with an additional foam pop filter.
Subject:RE: How do I remove noise interference from a Reply by: Kennymusicman Date:10/2/2007 10:50:04 AM Listening to the second, noisy clip, then there will not be a lot you can do to restore it. As rraud is stating, the importance is prevention, as opposed to cure. Your gain is way too high, causing the audio to clip severely in many places, especially in the second half. You need to pull the gain down quite a bit. If the recording method features any choice of auto-gain anywhere in the signal path, turn it off. This could mean you need to turn down the input on your creative card, but also perhaps turning down the output from your carlsbro mixer. You will have plenty of chances to boost the volume on the recording, but if you cook it before that stage - you get the results you hear. I suspect that you have a fair amount of treble boost somewhere in your signal path too - as it is particalulary the "s"'s that are clipping, and this I would guess would be coming from the output stage of the carlsbro, but that's not 100% Another thing you can try is seperation. When you have 2 speakers, it's impossible to determine the difference between them as they are talking over each other. Try hard-panning each microphone (1 left, 1 right) and this will allow you the room to play with each of them individually and join/mix them together to your hearts content. Are the speakers (the people) moving, or talking from fixed points - as that will steer which type of micrpophone would be best to use... HTH Ken
Subject:RE: How do I remove noise interference from a Reply by: ola Date:10/3/2007 8:19:45 AM Excellent analysis and tips ... thanks so much. I will try what you have suggested using the existing mics and see how it goes. Cheers, Ola
Subject:RE: How do I remove noise interference from a Reply by: ola Date:10/10/2007 7:56:39 AM Bringing "gain" down on speakers and the mixer worked a treat! For an evidence of that, listen to: www.praise-church.com/The_Glorious_Name_Of_Jesus_1.mp3 . Thanks very much indeed. Ola

Subject:How do I remove noise interference from audio

Posted by: ola

Date:10/2/2007 4:09:43 AM

I am using SF9 to record audio messages from our church services.
Sometimes the recording is perfect, but sometimes it is not. When the recording includes unwanted noise and interference, I would like to know what I can do to clean up the audio. The interference is most noticeable and unbearable when recording voices from more than one microphone.
In the current set up, we connect a creative sound card to a laptop running Windows Vista and the sound card to a Calsbro mixer output channel, using a USB cable. Speakers and microphones are also connected to the appropriate mixer channels.
For an example of a mostly good output:
Visit http://www.praise-church.com/AudioDownload.html
download and listen to the first file: "Wisdom_And_Counsel_For_A_Better_Life"
You can hear some interference noise (such as I would like to be able to remove) near the end of this recording.
For a recording that is not so good because of interfering noises, when more than one mic is in use, please download and listen to the following file:
http://www.praise-church.com/Prayer_And_Intercession_For_Broxbourne_06.mp3
Your help to overcome this problem will be greatly appreciated.

Ola Stevens, Praise Church

Subject:RE: How do I remove noise interference from a

Reply by: rraud

Date:10/2/2007 9:37:25 AM

"Wisdom_And_Counse" clip:

1. A foam pop filter would help with the plosives. (breath noise on Ps and B's, ect.) Ask the speaker back off the microphone a little....
2. Reduce the mixer's input channel gain. (preamp)
3. A different type microphone would help . I would recommend a Shure SM-58 with an additional foam pop filter.

Subject:RE: How do I remove noise interference from a

Reply by: Kennymusicman

Date:10/2/2007 10:50:04 AM

Listening to the second, noisy clip, then there will not be a lot you can do to restore it. As rraud is stating, the importance is prevention, as opposed to cure.

Your gain is way too high, causing the audio to clip severely in many places, especially in the second half. You need to pull the gain down quite a bit. If the recording method features any choice of auto-gain anywhere in the signal path, turn it off.

This could mean you need to turn down the input on your creative card, but also perhaps turning down the output from your carlsbro mixer. You will have plenty of chances to boost the volume on the recording, but if you cook it before that stage - you get the results you hear.

I suspect that you have a fair amount of treble boost somewhere in your signal path too - as it is particalulary the "s"'s that are clipping, and this I would guess would be coming from the output stage of the carlsbro, but that's not 100%

Another thing you can try is seperation. When you have 2 speakers, it's impossible to determine the difference between them as they are talking over each other. Try hard-panning each microphone (1 left, 1 right) and this will allow you the room to play with each of them individually and join/mix them together to your hearts content.

Are the speakers (the people) moving, or talking from fixed points - as that will steer which type of micrpophone would be best to use...

HTH

Ken

Subject:RE: How do I remove noise interference from a

Reply by: ola

Date:10/3/2007 8:19:45 AM

Excellent analysis and tips ... thanks so much. I will try what you have suggested using the existing mics and see how it goes.

Cheers,
Ola

Subject:RE: How do I remove noise interference from a

Reply by: ola

Date:10/10/2007 7:56:39 AM

Bringing "gain" down on speakers and the mixer worked a treat!

For an evidence of that, listen to: www.praise-church.com/The_Glorious_Name_Of_Jesus_1.mp3 .

Thanks very much indeed.

Ola