Test Listener

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DoktorOktagon
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Joined: July 22nd, 2018, 8:39 am

Post by DoktorOktagon » August 12th, 2018, 1:42 pm

https://librivox.org/uploads/tests/EDWARD_TULANE.wav



I used the Audacity software on my Lenovo PC using a USB microphone. I wasn't sure what was allowable for narration so I grabbed a book of mine and read. I am also unsure as to the upload process.

Any advice would be helpful. Thank you


Eric

TriciaG
LibriVox Admin Team
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Post by TriciaG » August 12th, 2018, 1:50 pm

Well, you uploaded it and got a link, so that part works. :)

File is in WAV format. We need MP3. Have you downloaded and installed the LAME encoder yet?

Some of the tech specs are MP3-specific, so I can't check them. But I'll check what I can. :)

- Your volume is too low. Visually, you should aim for your wave forms to peak near the 0.5 mark, like this:
Image

Make sure the microphone slider in the Audacity window is all the way up. Also, have you increased your input volume in Windows yet? Here's a link to instructions: http://wiki.librivox.org/index.php/Audacity_1-2-3#Volume

- The recording is in stereo. To change all future recordings, go to Edit, Preferences, Devices. Under Recording, change Channels to "1 (Mono)".

Please adjust these 3 items, then upload a new test. Post it in this same thread. We'll take another listen from there. :)

DoktorOktagon
Posts: 8
Joined: July 22nd, 2018, 8:39 am

Post by DoktorOktagon » August 12th, 2018, 4:12 pm

Thanks for the support!

I rerecorded it and made the proper adjustments as needed- my levels still seem low, but if I go any higher it seems to blast the speakers.


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


Let me know what needs to happen next.

Thanks again!


Eric

TriciaG
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Post by TriciaG » August 13th, 2018, 10:18 am

So, this recording is still in stereo, but all the sound is in one speaker/channel. And you've got clipping. Here's how it looks in my Audacity window:
Image

Did you set the recording channels to "1 (mono)"?

The red lines are where the recording is now clipping (going over maximum). The spikes seem to be mostly on S sounds. What kind of mic are you using? You said USB; is it a headset mic or a desktop mic? Do you happen to know the model? If you can, try placing the mic more along your jawline, at either 10:00 or 2:00. If it's a headset mic, try moving it below your mouth at about chin level. That might lessen the higher tones getting to the mic.

Go to View / Show Clipping. This will put those red lines in your window as you record. I don't think I'd lower the input volume; the rest of your voice is not that loud; it's just the S sounds.

Also, there's a pronounced hum/whistle/buzz going on in the background. It's unusual to get such a sound from a USB mic. How is it plugged into the computer? Are there any other items plugged in near it? (If it's plugged into a USB hub, what else is plugged into the hub?)

Finally, Bit rate is variable; it needs to be 128 constant. This is set when you export to MP3. When you go to export, on the screen where you enter the file name for the MP3, change the Bit Rate mode to Constant, and the quality should be 128 kbps. You should only have to set it once; it'll remember the setting until you change it again.

Another test, please? :)

DoktorOktagon
Posts: 8
Joined: July 22nd, 2018, 8:39 am

Post by DoktorOktagon » August 14th, 2018, 12:34 pm

Thank you for the feedback Trish! I tried including a screenshot of my Recording Preferences tab but it appears not to want to paste into the window. It appears to be in Mono presently. I also did another read with Clippings On, and it again seems to have recorded properly (without red marks). As for the microphone- I have a Blackweb USB Desktop Microphone via Big Box Store. Could that be where the hum is coming from?

Here's the newest file, if you wouldn't mind taking another listen.


Thanks immensely,

Eric


https://librivox.org/uploads/tests/ET_Test3.mp3

TriciaG
LibriVox Admin Team
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Post by TriciaG » August 14th, 2018, 1:54 pm

Yep, it's mono now. :)

Regarding the noise: yes, it's probably from the microphone somehow. If you fall in love with recording and want to do it for the rest of your life, you'll want to invest in a better microphone. But in the meantime with some noise reduction, this should be OK for our purposes. :)

Here are a couple resources for noise reduction:
text instructions: http://wiki.librivox.org/index.php/Noisecleaning_With_Pics
video, but with an older version of Audacity so the settings are different: http://www.youtube.com/watch?v=VFSg9o37HMw

My settings are as follows:
Noise reduction: 10-16 (I suggest about 14 for you)
Sensitivity: 6
Frequency Smoothing: 6

The only other issue is that the bit rate is still variable. Here's a picture:
Image

(To post a picture, it has to be online somewhere where you can link to it. You can't upload/insert pics into posts directly.)

DoktorOktagon
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Joined: July 22nd, 2018, 8:39 am

Post by DoktorOktagon » August 19th, 2018, 10:42 am

Hello again!

I tried experimenting with levels and distances and whatnot. I believe you are correct about the microphone- is there one that you would suggest for somebody just getting their feet in the water?

Here's a new test for your consideration- the hummmm is still apparent.


https://librivox.org/uploads/tests/ET_Test5.mp3


Thanks again!

Eric

TriciaG
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Post by TriciaG » August 20th, 2018, 6:35 am

Yeah, still has the whistle and the very strong S sounds. :?

Here's a fairly recent thread with mic suggestions: viewtopic.php?f=23&t=69485

audiomike
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Post by audiomike » August 20th, 2018, 7:48 am

So, just what mic are you using? Is it a mic on the desktop or a headset? Most USB mics have a headphone jack so you can monitor without latency. Is the noise present there when you record? The noise is strongest at 1kHz and evident every 1kHz thereafter right through the voice range. In Audacity, click on the spin down to the right of the filename on the track. Select Spectorgram to see what I mean. Also make sure your mic isn't picking up the fan noise from your computer.

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