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low audio problem
I posted this in the Basics Forum, but figured I should post it here too. Hi. I’m new to the forum and I have what I think might be a pretty basic question. I’m shooting some testimonials in HD that I’ll be converting to flash for use on a website and I didn’t use an external mic so some of the audio was pretty low. I turned the volume up on the low audio tracks in Vegas and along with that came a hissing sound. I’m sure there’s a specific name for it. Anyway, I was wondering how I could clean that up or if there was a better way to increase the volume without creating a hiss. Thanks in advance.
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5 Replies
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You can EQ most of the hiss out Creat a notch filter and sweep it until the hiss goes away, and there’s many noise reduction pluggins out there. Hope this helps
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Using a noise reduction plug-in might be the easiest and cleanest way to deal with broadband noise like you have. There is iZotope RX, BIAS Sound Soap 2, and Sony’s own Noise Reduction which ships with Sound Forge.
iZotope RX is the best but it’s also the most expensive. BIAS Sound Soap 2 is the least expensive, pretty darn good with broadband noise, and is very simple to use. You might want to try the free trial of that first.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
You might also try the noise reduction function in Audacity, a free sound program.
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I took a shot at Prentice’s question over in the basic forum. Didn’t add much to the discussion that the experts here haven’t covered: high frequency, broadband noise can be attacked with EQ (noting that human speaking voices are in the 80-250Hz range), maybe add a noise gate, optional noise reduction. I did also suggest cheating (as I often do) by dropping a music bed underneath, if it’s appropriate to the style of the piece.
But that got me thinking. What order would you guys go at this? Meaning: Would you EQ first, then NR? Would a soft gate be a part of the solution?
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> But that got me thinking. What order would you guys go at this? Meaning: Would you EQ first, then NR? Would a soft gate be a part of the solution?
I go right for the Noise Reduction first thing. In fact, I will try applying the noise reduction before increasing the gain. This is to suppress the noise floor while it’s still quiet. But sometimes that’s not enough and it’s better to apply the NR after increasing the gain. Then I will use EQ to make it sounds better but not as a noise reducing step. All three noise reducers that I mentioned (Sony NR, Sound Soap 2, and iZotope RX) all make a noise print so there is no need to use an EQ which may mask the noise when you have a tool that can actually remove it via a sound print.
Noise gates are good for when the noise is not constant making a noise sample less effective. However, I never use a noise gate unless I have room tone to place under it. There is nothing that gets peoples attention that something’s not quite right quicker than total silence.
BTW, I like to use the music bed trick when there is unwanted wind rumble. Wind rumble is almost impossible to remove without taking out too much bottom, and music really helps to put the bottom back so that voices sound more natural. (investing in a good wind screen is always a good idea)
~jr
http://www.johnrofrano.com
http://www.vasst.com
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