One minute test

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steelpython
Posts: 1
Joined: June 26th, 2018, 5:20 am

Post by steelpython » June 29th, 2018, 2:14 am

Here I go, my one minute test!

https://librivox.org/uploads/tests/steelpython-1min-test.mp3

Recording software: Audacity 2.2.2
OS: GNU/Linux (Arch w/ Linux 4.15.13-1)
Mic: analog (cardioid condenser)

knotyouraveragejo
LibriVox Admin Team
Posts: 14692
Joined: November 18th, 2006, 4:37 pm
Location: Pennsylvania

Post by knotyouraveragejo » June 30th, 2018, 11:57 am

Hi steelpython. Welcome to LibriVox.

A couple of technical things to fix. The first two are necessary to meet LV requirements. The last two are optional suggestions. :)

1. The bitrate for the exported mp3 should be a constant bitrate of 128kbps. Your file was exported at a variable bitrate.

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

2. Your volume is a little on the high side at 92.9 db. We shoot for 89 db, but 86-92 is acceptable.

3. This test recording has a noticeable high pitched hiss. Eliminating it at the source if you can identify it would be ideal, but if that's not possible then that can be removed with a notch filter or single parametric (2 passes - one at ~ 1997Hz and a second at ~ 3980). This article talks about mains hum, but the principle is the same for removing high frequency interference.

https://wiki.librivox.org/index.php?title=Removing_Mains_Hum

4. You can follow that with a light pass of noise reduction to clean up the rest of the background noise, but that is up to you.

http://wiki.librivox.org/index.php/Noise_Cleaning

Here's the result. See what you think.

https://librivox.org/uploads/tests/steelpython-1min-test_nc.mp3
Jo
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