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Re: Need some audio cleanup help please (hiss)

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Rick MacRe: Need some audio cleanup help please (hiss)
by on Feb 23, 2007 at 5:47:17 am

Eric,

My day job has me doing NR quite often for our shooters. I use Audition (cooledit) at work to cleanup location audio and it is a great program for this.
I prefer the Noise Reduction workflow over the hiss removal option.
One really cool thing you can do is tell it how much NR to do in any given Frequency band. For example, why process the bass and upper bass frequencies. Target the frequency band where the hiss is. This gives you less artifacts overall. Hiss is going to be most noticeable in the mids and upper mids where your hearing is most sensitive. Try targeting
2000-6000 hz. Better yet, learn how to use the spectral view to locate the frequency range of the hiss. The objective is to reduce the hiss to a livable level. In most cases the total elimination of the hiss creates artifacts and unnatural sound. Follow the workflow mentioned by previous poster but add this step after you capature profile. Directly under the Noiseprint window you will see a window with a straight line. When you move your cursor within the box you will see the frequncy the cursor is at in a little box under the second box. Move to 2000HZ and click on the line (this adds a point to the line). Now place another point just to the right of your first point. Now Go up to 6000HZ and put another two points. Now click and drag your 1st two points on the left side all the way down. Then go to the right side and drag down the two far right points all the way down. Now what you will see on the line is a big bump from 2000-6000hz, and nothing below and above that range. This tells the program to Noise reduce only from 2000-6000Hz. Now set your Noise Reduction Slider to 50% and close the NR Window. Out on the timeline highlight 15 - 20 seconds of clip and go back to NR window and click OK.
This will process the highlighted section. Play thru it to see if 50% reduction is good enough. After listening test you can undo and highlight the entire clip for processing or sliding in a higher ratio on reduction slider. One last tip, EQ is not a good way to get rid of hiss. As you found out already you end up with very muddy sound. EQ's are great for enhanceing the audio track or applying a high pass filter around 120HZ to get rid of low end rumble. By the way, a little eq lift by a few db around 2000-4000 can make your vocal cut thru better if it is a bit muddy.

Hope this helps, good luck, let your ears be the judge, and no when to stop processing.

Later..Rick.


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