1-minute recording in english by Emma Norman

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Joined: May 17th, 2020, 6:39 am

Post by emmaoran » May 22nd, 2020, 6:20 am


Used software: Audacity
Operating system: Windows
Mic type: USB

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Joined: November 18th, 2006, 4:37 pm

Post by knotyouraveragejo » May 22nd, 2020, 12:18 pm

Hi Emma, Welcome to LibriVox!

First, this test file is stereo. It needs to be mono. Here is how you set this in Audacity for all future recordings.

Edit - Preferences - Devices
Under the Recording section you should see your microphone listed as the device. Under that set Channels to 1 (Mono).

Second, the bitrate for the exported mp3 should be 128kbps constant bitrate. Your file was exported as a variable bitrate at ~ 140 kbps

You set the bitrate in Audacity when you export to mp3 at the bottom of the export window under Format Options.
Bit Rate Mode: Constant
Quality - select 128 kbps from the dropdown

Your volume is OK, but the beginning of the recording is much softer than the rest. You may have changed you position relative to the microphone or started speaking louder once you got going.

To judge whether you have the volume set correctly it is consistent, your waveform in Audacity should look similar to this example:


You can download the checker program to check your volume after exporting to mp3 and before you upload your file.


If you prefer you can use the Replay Gain plugin in directly in Audacity to tell you how much your file needs to be amplified to get to 89 db. Instructions here:


There is some background noise that could be reduced using the Noise Reduction plugin in Audacity. The default setting should do the trick.


Please make the above changes to your settings and upload another test. Just post the link to this same thread to keep all your tests together.
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