one minute test Linda Chen

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lichen
Posts: 7
Joined: April 20th, 2021, 12:00 pm

Post by lichen » May 17th, 2021, 8:18 pm

I am using Audacity and laptop without a microphone.
https://librivox.org/uploads/tests/test_lindachen,mp3.mp3

sjmarky
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Joined: August 28th, 2006, 8:47 pm
Location: Poictesme
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Post by sjmarky » May 18th, 2021, 8:22 am

I reviewed your test sample and some changes are needed. LibriVox requires audio that is 128kb constant bit rate, mono, and between 86db and 92db, preferably 89-90. Your audio is 176kbps, stereo, and just 79.3db. There is also an extreme amount of background noise.

I don't know what you mean by "without a mic." Do you mean that you are using a built-in mic on your laptop? First, if you have a gain control on your PC, turn it up so your raw recording has wave forms that peak at about the 0.5 marks in the Audacity window. You can also adjust the recording level in Audacity; the slider is in the upper right. If necessary, adjust the volume level before exporting by going to Filters>Amplify.

Use Audacirty’s Noise Removal filter to reduce the background noise about 10db. A video tutorial on Audacity noise removal is available here: https://youtu.be/rvhqw7zBmEo

When exporting your MP3 from Audacity, be sure to first check Bit Rate Mode - Constant, then select 128kb from the pull-down menu, and check Force Export to Mono.

You can verify your audio yourself by downloading the free Checker app: https://cgjennings.ca/projects/checker/

Please record a new test with the same file name and post it as a reply. I’ll return and review it for you.
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