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GoldWave Inc. • View topic - US Coast Guard Radio Calls

US Coast Guard Radio Calls

GoldWave general discussions and community help

US Coast Guard Radio Calls

Postby thdot44 » Fri Sep 26, 2008 3:21 pm

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Postby DougDbug » Fri Sep 26, 2008 4:43 pm

GoldWave has a couple of tools that might help, but first I'll warn you that noise reduction can be difficult, and sometimes it makes things worse... Professionals record in soundproof studios and they use low-noise equipment to prevent noise. Noise reduction works best when you have a constant low-level background noise, such as slight tape-hiss.... In other words, it works best when you don't really need it.

Note - All of GoldWave's effects and filters have a "preview" button so you can experiment before you apply the effect to the entire file. This kind of thing requires lots of trial-and-error.... Well... most audio editing requires lots of listening and trial-and-error.

For this type of noise, your best option is probably a noisegate. A noisegate works by killing all of the sound when the volume falls below a preset threshold. It doesn't affect the sound at all when the volume is above the threshold. It's similar to the control that you might have on your communications-radio. In GoldWave, you can find some noisegate presets under Effect -> Compressor/Expander. (You can start with the presets, and then experiment with different threshold settings.)

GoldWave also has a noise reduction filter that tries to distinguish between the signal and the noise (Effect -> Filter -> Noise Reduction). The best way to use the noise reduction filter is usually to copy a section of noise-only into the clipboard (highlight the noise and click Copy), and then choose the Use Clipboard option. Again, that's a starting-point and you may need to experiment with the settings.

With the noisegate and noise reduction filter, you'll have to compromise between under-doing it, leaving some noise, and over-doing it, removing some "signal." Sometimes "the cure is worse than the disease", and you are better-off leaving it alone.

You can also do some frequency-filtering. You can start by experimenting with the equalizer (Effect -> Filter -> Equalizer). You can just experiment to see if you can reduce the noise and/or improve intelligibility. If you need "stronger" or more precise filtering, GoldWave has a parametric equalizer and a variety of other filters (high-pass, low-pass, band-pass, band-reject). The regular (graphic) equalizer can serve as a starting-point to help you decide what kind of filtering and what frequency range to use.

Good Luck!
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Location: Silicon Valley

thanks

Postby thdot44 » Fri Sep 26, 2008 4:55 pm

awesome thanks very much for the response.
thdot44
 
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Postby Mymilitary » Thu Oct 23, 2008 3:30 am

I just download goldwave and i'm trying to record a song but when I play it back I don't hear anything. How do I get it to record and playback what I just recorded.

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Postby DewDude420 » Fri Oct 24, 2008 10:00 am

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