Audacity test

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WilmaS
Posts: 5
Joined: January 31st, 2021, 12:56 pm

Post by WilmaS » February 7th, 2021, 12:14 pm

Please review my test and give me feedback. It was recorded using a Mac and a usb mic (Yetti) via Audacity.


https://librivox.org/uploads/tests/audacitytest1.mp3

wib66
Posts: 9921
Joined: January 5th, 2012, 8:57 am

Post by wib66 » February 7th, 2021, 1:35 pm

Hi and welcome to Librivox. Your reading is great there are just some edits needed please. Please carry out the edits then upload the file using the same file name. Thanks

The bit rate should be 128 kbps. When you export the file change ‘quality’ to 128kbps.

The recording should use a constant bit rate. When you export the file change ‘bit rate mode’ to ‘constant’

It would also benefit from some noise reduction which can be done in Audacity

Step 1 - Select a piece of background noise
Select a piece of background noise (no speech, breaths or other noises) in your audio.
In Menu click: Effect > Noise Reduction... A dialog will pop up.
Click "Get Noise Profile" The dialog box will close instantly.
Step 2 - Noise Reduction
Press CTRL-A / Command-A to select your complete recording.
In Menu click: Effect > Noise Reduction... again. Note: don't select "Repeat Noise Reduction" -- that instantly applies the default settings; you want to adjust the settings and preview the results before you apply the noise filters.
Set all sliders to 6. Hit Preview .
The most likely setting for Sensitivity (second slider) will be 6. If you have very light noise, you may try a lower setting. If you can still hear noise behind your voice, increase the slider.
The most likely setting for the Frequency Smoothing (bands) (third slider) is 6. This equates to the 150Hz Frequency Smoothing in previous versions of Audacity (see above).
Now experiment with the Noise Reduction slider (first slider) and increase it in small steps and preview again and again until you are satisfied with the preview.
A setting of 6 would be very light noise removal - use if you have very little noise
A setting of 12 would be a moderate setting - use if you have moderate noise
A setting of 18 would be a stronger setting - use if you have a nuisance noise, but consider also whether you should have used a Notch Filter before using Noise Reduction (see above). Leaving a little background ambience is definitely preferable to introducing unwanted 'artifacts' and distortions by cleaning too heavily.
Make sure that the 'Reduce' radio button is checked, and hit OK ~- (the effect may take a couple of minutes if it is a long file) -~ Done!

WilmaS
Posts: 5
Joined: January 31st, 2021, 12:56 pm

Post by WilmaS » February 8th, 2021, 1:11 pm

Thanks so much. I will try! Technology is confusing to me. I had not used headphones and I am guessing that is what I need to do in order to evaluate the background noise.

WilmaS
Posts: 5
Joined: January 31st, 2021, 12:56 pm

Post by WilmaS » February 21st, 2021, 1:56 pm

Here is the test redo. Please let me know if it's OK.

https://librivox.org/uploads/tests/audacitytest2.mp3

wib66
Posts: 9921
Joined: January 5th, 2012, 8:57 am

Post by wib66 » February 21st, 2021, 2:21 pm

Hi thats great there is just one more edit needed please

The volume is 81dB which is too low. We aim for between 86-92 dB but ideally we would like it to be at 89 dB.
In Audacity you will also find the option to amplify under 'effects'.
How to amplify in Audacity: https://www.youtube.com/watch?v=z_z607awyLw
If you like you can use the checker tool to verify volume and other settings.
https://cgjennings.ca/projects/checker/

If you could carry out that edit and reupload using the same filename that would be great thanks

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