![]() On the other hand, most of the time we don’t want to remove these sounds, we simply need to reduce them. Removing voices behind your actors can be very, very difficult. Worse, the frequencies of the talking you want to remove are, essentially, the same as the frequencies of the talking you want to keep. Machine noise, like fans or air conditioners, are higher frequencies, but, generally, defined by some very specific pitches. (We use “Hz,” or “Hertz,” as the abbreviation for “cycles per second.”) Low frequency hum is around 60 Hz, so it is easy to separate voices from hum based on this frequency difference. Human speech is roughly 200 cycles per second to about 6,000 cycles. Why? Because all sounds exist as a series of rapidly changing frequencies. The hardest noises to get rid of are echoes and people talking in the background. The easiest noises to get rid of are low-pitched hums. Machine noises are interwoven with everyday life unless “everyday” is the Middle Ages. But, in a sad death scene, a cheering crowd is distracting. Noise is anything you don’t want to hear in your clip.įor example, in a football video, a cheering crowd adds energy to your video. However, it is often best to clean-up audio in a dedicated audio program, such as Adobe Audition. That's the key to the whole process.There are some good noise reduction tools in Final Cut Pro X and Premiere Pro CC. And then repeat the process once more, using the lowest value of FFT, still taking only 3-4dB.īecause you have to resample each time, these steps are cumulative - you are taking a fresh noise print with what's actually there, rather than what you started with, and you will end up with a decent amount of artifact-free NR - as long as you don't overdo it. Once again, only take 3-4dB off to avoid artifacts. At that point, you need to repeat the process, only with the FFT set to a mid-range value. This means setting the Noise Reduction value so that the green band is slightly under the yellow band, (usually around 70-80%) and the Reduce by slider set to 3-4dB. ![]() So at a high FFT setting, don't take off more than about 3-4 dB. To minimise artifacts, take off very little noise at a single pass. The next important bit is how much to use. When you subsequently click on 'Capture Noise Print' that selection is what is captured, and that FFT size is the one it uses. Now, whilst keeping the plugin open, go back to your waveform and make the selection, as above. Don't leave it at the default, but increase it to the maximum value. Go then to Advanced, and select the FFT size. The best method is to open the plugin first, and it will say 'noise print undefined'. The correct way to use NR isn't to make the noise selection first, incidentally. When you let go of the mouse, the highlighted selection is what you use as the noise print. You make the selection in the normal way you make one position the cursor at the start of your background noise, hold the left mouse button down and swipe the mouse forward to the end of the noise selection. What you need to select is a portion of silence where there isn't any wanted audio - in other words, it's the noise before or after speaking that you need to select. The one thing you don't want is a portion of audio!
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |