ASK & DISCUSS INDEX

10 years, 4 months ago - Paddy Robinson-Griffin

'Bias Sound Soap', if you can find a copy, is surprisingly good at cleaning audio with very few controls and a pretty dodgy interface. If the noise is mains hum, you need to look at your sound recording workflow as it shows you're running unbalanced or possibly an earth loop somehow. If it's tape transport noise (I'm not familiar with the camera, and typing from a phone), you may be using the built-in microphone, which will be awful anyway!

10 years, 4 months ago - Claire Buckley

Could be...

I assume it's mains power inductive or induce hum. I also assume you are in the UK and therefore the frequency of the mains AC is 50HZ. If you are elsewhere in the world it may be 60Hz. You can get this if you had unbalanced mic feed or some other exposed path across a power cable. It shouldn't be a "common" problem especially if you are using balanced line audio feeds or interconnections - but I digress.

What you need is called a 'notch filter'. Simply it applies a significant amount of attenuation at a specified frequency of narrow or selective bandwidth (this is often call the 'Q'). It may also be that the hum spans into harmonics (even or odd multiples of the original). But you should get some success with a good tunable notch filter with adjustable Q and attenuation.

Depending upon your audio content and especially with speech, you might find you have removed the hum but may have also lost some of the bottom end. If the notch has a really narrow bandwidth (large Q) you should have some success.

Good Luck

10 years, 4 months ago - Marlom Tander

Noise Reduction is worth trying as well, again, a filter in your audio editing software.