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AUDIO HUM
When you are capturing a deep humming noise distortion in the microphone, there are some things that you will want to look at to avoid the aforementioned issue.
- keep your headset away from magnets (i.e., speakers), electrical wiring, and kitchen appliances (i.e., microwaves).
- Use a USB headset. (I use is a Plantronics Audio 655 DSP with built-in noise reduction)
- HUM can be cleaned up slightly with audio restoration plugins (i.e., Audacity noise removal).
- Ground looping
- Having the microphone volume too high will cause feedback and distortion.
Rule 1: the best output depends on the best input
Audacity Help:
- http://www.podtopia.net/gettingstarted/removenoise.shtml
- http://wiki.audacityteam.org/index.php?title=Noise_Removal#Nyquist_Noise_Gate_Plug-in
Webrefs:
- http://www.vocalist.org.uk/microphone_techniques.html
- http://www.ehow.com/how_5041565_reduce-noise-audio-recording.html
- http://www.channld.com/hum.html
- http://www.epanorama.net/documents/groundloop/
- http://en.wikipedia.org/wiki/Ground_loop_%28electricity%29
Google Search Terms:
- audio ground looping
MCAST
MCAST - multimedia podcasting
Comments
Very helpful! I wasn't sure how to eliminate the hum in Audacity - I'll get that worked out for episode three!
The solution that worked for me is a USB headset. I have tried many different USB headsets but I tend to gravitate back to Plantronics, not because they make a fabulous product, but their headsets seem to produce the most reliable audio recording over time. Pricing varies wildly on headsets. I often see sales of 50% or more on items that are already extremely expensive. My price range in Canada is around $40CDN for a high end USB headset with a life expectancy of about 5 years. I have seen the same item cheaper at times, and also way more expensive....that's consumerism!
Although I have found out through experience and paying for many types of headsets, there are many other people in the podcast biz (http://www.slideshare.net/dkaye/skype-for-interviews) who advocate the same thing.
Given that a headset can be dropped and kicked around, it is noteworthy that faulty wiring in a USB headset can also contribute to noise capture problems. The solution is to always run a test audio clip to evaluate the expected quality...hence why its good to make a Skype test call (to hear the quality of your recorded voice online).
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