A free solution that might work for you is audacity’s noise removal algorithm, where you can use a few seconds of your audio that contain the problematic audio you’re trying to get rid of, and then apply noise reduction to your entire clip. In that case you might need to use an advanced noise removal algorithm. If it’s a nastier hum, or broader frequency noise like an air-conditioner hum or just an overall noise coming in through your mic, the methods mentioned above won’t work. If the noise or hum are located in the high or low portion of the spectrum and your audio isn’t, a high or low pass filter might do the trick without doing to much damage to the audio you intended to record. Notch filters are typically free with most audio and video editing software – and certainly with the fantastic open source Audacity software. By applying a sharp notch filter to that particular frequency, I was able to completely remove the noise without any noticeable change to the audio overall. ![]() For example, I recently recorded a long audio clip and only after recording the whole thing noticed a relatively quiet but nasty high pitch noise at 8khz, that for some reason I missed during recording. If the noise happens to be at a particular frequency, you can use a precise notch filter at that frequency. If you’ve already recorded your audio with ground noise, and re-recording isn’t practical, you may be able to fix it in post with a filter or plugin. Ferrite beads aren’t designed for audio rate noise – rather, for things like network or USB cables. ![]() You can either buy a transformer or cable with a built in choke, or buy a separate ferrite bead and install it on your cable. Ferrite beads/chokeĪnother option that may work for you is Ferrite beads or a ferrite choke. ![]() One thing I have noticed this do is invert the audio’s phase, which is probably not a big deal unless there’s a particular case where this is a problem for you. However, your audio interface or other gear may not support balanced outputs, so plugging a balanced cable into it won’t help…which brings us to solution number three… Use a ground loop isolatorĪ favorite of mine is a simple and cheap ground loop isolator – just pass your audio through it and magically the annoying ground loop noise will disappear. If you’re like me and just don’t want to run wires so that everything is plugged into one place, use balanced, or XLR or TRS cables across your setup – while these cables may look like stereo cables they’re actually used to carry one mono signal, so you’d need two to carry stereo audio. I’ve seen people recommend removing the ground pin or using a ground lift plug on one but not both of your sockets – I’m no electrician but that doesn’t seem safe to me – and the only reason I’m mentioning it is because that’s something I think you shouldn’t do. If a ground loop is the problem – Plugging everything you’re using into the same outlet will probably solve it – most noise or hum issues coming from ground loops are a result of having your setup plugged into more than one wall socket in your studio. Here are a few ways to solve this problem: Have you ever hooked up a new piece of gear into your setup and suddenly heard a horrible noise you weren’t expecting? Or just had an unbearable noise find its way into your recording without you noticing in the heat of the moment? The cause may be a ground loop, some other interference, or even loud air-conditioning.
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