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. There are some good noise reduction tools in Final Cut Pro X and Premiere Pro CC.
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