Q: I can use compressor but it brings up the quiet parts so that the background noise is now at an unacceptable level, how can I fix this?Ī: A gate/expander may help. However, if you have taken all those steps and you still have annoying background noise, here are some ideas: Noise Prevention will give you some tips to help you make cleaner recordings and save you a lot of bother. There are many effective ways of removing background noise once you have got it, but of course, it is better if you can avoid the noise in the first place. It tends to happen most with deeper voices. The peaks above and below the line on an asymmetrical recording are not the same size, and this is perfectly normal and harmless. DC Offset prevents the audio being normalized to maximum volume, and may even introduce artifacts into the audio, so always remember to Normalize if you have this problem.ĭC Offset is not the same as your recording being asymmetrical. If the signal never goes to the proper rest position, then the speakers playing that audio will also never go to their rest position. There are some sound cards (and audio chips in some computers with on-board sound) that introduce DC offset and there's nothing you can do to stop that. Every bit means 6 dB, so just a few bits can mean a lot of decibels off the headroom of your system. If your system is generating DC Offset, the signal, when at rest, is a few bits off 'minus infinity'. It signifies a level of 'minus infinity dB'. The central horizontal line is where the signal should be when you are not saying anything. ![]() Here's a more detailed explanation of DC Offset: Secondly, if you try to amplify your recording, you will not be able to amplify it to the maximum volume. Firstly, if you try to edit your recording, it will make nasty clicks. Does it matter? And if it does, how do I fix it? Q: My whole recording is not centred on the middle line. It has been reported that it does not work on the latest version of MacOS. Our own Checker program: this requires Java to be installed on your computer. MP3Gain for Windows or MP3Gain Express for Mac: these are simple free programs which will tell you the decibel level of your MP3. * Optional: If you choose Normalize from the drop-down menu, Audacity will amplify it for you, providing it doesn't cause clipping. Now your recording should be set to the optimum of 89 dB. ![]() Keep the defaults, make sure to not check the box for "Allow clipping", and confirm by clicking OK. ![]() This means that you have to use Effect > Amplify and set your amplification to -1.8 or 2.7 dB, respectively. When next you start up Audacity, you will be able to select the whole recording (Ctrl A on Windows), then go to Effect > ReplayGain (it may be hidden under Effect > Plugins).įrom there, leave all defaults and just click on OK. * For Audacity versions from 2.1.1 ONLY: Click Analyze and choose Manage. On Linux, this folder is located at /home/username/.audacity-data/Plug-Ins.ĭrag the file you saved into the Plug-Ins folder. Now browse to the folder in which Audacity is installed (on my Windows 7 machine, it's in C:\Program Files (x86)\Audacity) and then open the Plug-Ins folder. It shows the amount of amplification or de-amplification required to bring your overall volume to 89 dB.ĭownload ReplayGain.ny from the Audacity website and save the file to your computer - your desktop or somewhere where you can easily find it. This plug-in enables you to check the volume of your recording within Audacity. There are a number of ways to check your volume: Q: How do I know if my volume is high enough?Ī: We look for an overall volume of between 87 and 91 dB, ideally 89 dB (-16 to -14 LUFS). ![]() Normalize can only increase the volume to the extent that the spikes are still within maximum possible volume, so the quiet bits don't get amplified enough. If you look at your recording, you will see that there are lots of spikes. In this case, you need to use Compression. If some parts of the recording are still too quiet, then the Normalize command wasn't enough to solve your problem. It is not allowed to go above 0 dB, or it will cause unpleasant distortion of the voice. The Normalize command simply increases the volume until the wave fits within the available space. Do not check the box that says "Allow Clipping". Find a command in your editor called Normalize. Q: My sound file is too quiet, what is the problem and how do I fix it?Ī: The wave is too small.
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