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Authoress
Posts: 1
Joined: June 7th, 2021, 12:22 pm

Post by Authoress » June 15th, 2021, 3:58 am

Hi!
Here's my 1 minute test. I used audacity, on windows, with a USB mic. I think my volume might be too low, but I've set my mic volume to 100% and I'm not sure how to make it louder. Advice would be greatly appreciated!

https://librivox.org/uploads/tests/test_authoress.mp3

sjmarky
Posts: 3388
Joined: August 28th, 2006, 8:47 pm
Location: Poictesme
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Post by sjmarky » June 15th, 2021, 8:02 am

Hi Leanna

I reviewed your test sample and some changes are needed. LibriVox requires audio that is 128kbps constant bit rate, 44.1kHz sample rate, mono, and between 86db and 92db, preferably 89-90. Your audio is 103kbps variable bit rate, and a bit too low at 85.2db.

First, if you have a gain control on your mic, adjust it so your raw recording has wave forms that peak at about the 0.5 marks in the Audacity window. If necessary, adjust the volume level before exporting by going to Filters>Amplify. An alternative is to use Filters>Normalize, choose peak and set it to -3 or -4db.

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 check 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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