Test number 2

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AnneFiennes
Posts: 3
Joined: November 14th, 2020, 10:44 am

Post by AnneFiennes » November 16th, 2020, 11:27 am

Hi all,
I've just uploaded my 1 minute test and would be grateful for any input!
I have a MacBook and used GarageBand as my software. I used a USB microphone.
Here it is:
https://librivox.org/uploads/tests/test_annefiennes.mp3

RomaSingh
Posts: 75
Joined: September 17th, 2020, 1:01 pm

Post by RomaSingh » November 16th, 2020, 8:15 pm

AnneFiennes wrote:
November 16th, 2020, 11:27 am
Hi all,
I've just uploaded my 1 minute test and would be grateful for any input!
I have a MacBook and used GarageBand as my software. I used a USB microphone.
Here it is:
https://librivox.org/uploads/tests/test_annefiennes.mp3
Hi AnneFiennes, welcome to Librivox! So glad to have so many people joining us.

Regarding your test, you have a clear and loud voice, making it easier to hear. There are a couple of technical issues, however. There seems to be a lot of background noise in your recording. Try recording in a quieter place if available, or use a different mic. You also can go to Audacity at the top and click Effect<Noise Reduction and reduce the noise.

Your track is a stereo file, we need to have it as mono. You can do this when exporting your track.

Typical Librivox recordings have about 5 seconds of silence at the end, so just remember that when you are recording.

Overall, great first recording! It's ok if you didn't get everything required, I didn't either. You might want to wait for somebody else's feedback, it might be better than mine, as I've only been here for a short amount of time. :D

MaryAnnSpiegel
LibriVox Admin Team
Posts: 16171
Joined: February 23rd, 2009, 4:37 pm
Location: Chicago, IL

Post by MaryAnnSpiegel » November 18th, 2020, 6:20 pm

Anne,

I've also listened to your test and agree that you have just 2 issues to fix:

Change stereo to mono
Do noise cleaning.

Unfortunately, I don't know of a way to force GarageBand to export in mono. A number of people have struggled with this over the years and it seems like the newest version of their software has eliminated this option altogether. That's why we strongly recommend that people use Audacity.

I suggest you try to make another recording using Audacity. Info on setting up Audacity to meet the LV tech specs is here: https://wiki.librivox.org/index.php?title=Audacity_1-2-3

Then submit a new recording and we will check it again. It helps if you change your filename to "test2_yourname".

MaryAnn

AnneFiennes
Posts: 3
Joined: November 14th, 2020, 10:44 am

Post by AnneFiennes » November 18th, 2020, 7:49 pm

Thank you both for the advice, I will re-do the test with Audacity.

AnneFiennes
Posts: 3
Joined: November 14th, 2020, 10:44 am

Post by AnneFiennes » November 19th, 2020, 6:42 pm


MaryAnnSpiegel
LibriVox Admin Team
Posts: 16171
Joined: February 23rd, 2009, 4:37 pm
Location: Chicago, IL

Post by MaryAnnSpiegel » November 20th, 2020, 3:29 pm

Great Anne. I've merged your two tests, so everything is in the same place.

You're pretty close. I hear a hum in the background. Is anything running? If you listen with headphones, I think you'll hear it too. I was able to get most of the hum out with two passes of noise cleaning, but it's best if you can find the source and shut it off when you record (or move farther away). See if you can get away from whatever is causing the noise, and then apply some noise cleaning. Instructions are here: https://wiki.librivox.org/index.php?title=Noise_Cleaning Phil has also done some helpful videos, including one on noise cleaning. Links are here: https://wiki.librivox.org/index.php?title=Instructional_Videos

Your volume is a little low. You come in at 85.7 dB. Our target is 89 dB, with 87-91 being acceptable. That means that after noise cleaning, you'll need to amplify a bit. Instructions on how to check your volume using a plug in to Audacity called ReplayGain are here: https://wiki.librivox.org/index.php?title=Measuring_Volume_within_Audacity

The trouble is, your recording has a couple of spikes that get pretty close to the top and bottom of the window. If you amplified your file enough to get the overall volume up to 89dB, that would cause some of these spikes to get cut off, which can affect the quality of the recording. This is called clipping and you can make it show up red in Audacity by hitting View | Show Clipping.

So, before you adjust the volume, you need to bring down those spikes a bit. For this, please watch Phil's video on the "compressor" feature in Audacity. It's not something that I use often, but if you follow his instructions and the settings he recommends and you'll come out fine.

THEN, you can analyze your file with ReplayGain. It will tell you how much you need to amplify. I always use the Effect | Amplify to actually change my volume (as opposed to letting ReplayGain do it for me), because that way Amplify will ask me if I'm sure before it lets me amplify so much that I introduce clipping.

You know, when I first started reading, I had a lot of spikes too. Something about just being aware of them, they have decreased over time, so now it is seldome an issue for me. Which is just to say, at some point you may be able to drop the compressor step. Pretty much everyone does some sort of noise removal and volume adjustment on every file, so those steps will likely stay with you for the long term!

Please do another test, name it 3 this time, and upload it to this thread.

MaryAnn

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