This doesn't look right... help!

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CBJorgen
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Operating System: macOS 10.15 Catalina or later

This doesn't look right... help!

Post by CBJorgen » Sat Jan 12, 2019 7:43 am

Could anyone please look at the picture and tell me what might be wrong? I haven't made any adjustments, but the lower half of the wave form is longer than the top half. Unfortunately my mic fell about 3 feet to the floor. It seems to sound normal, but I don't know if it has anything to do with the way this wave form looks. I'm relatively new to Audacity, but I have not made any edits to this sound bite.

Oh, sorry: macOS Mojave 10.14.2
Audacity 2.3.0

Thank you,
Christian
Attachments
Screen Shot 2019-01-12 at 2.27.28 AM.png
Screen Shot 2019-01-12 at 2.27.28 AM.png (122.67 KiB) Viewed 391 times

kozikowski
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Re: This doesn't look right... help!

Post by kozikowski » Sat Jan 12, 2019 9:56 am

I think you're just now noticing stuff that's been there all along. My voice is non-symmetrical like that.

The sample is too loud. The waves should not go all the way to either of the 1.0 marks. That will create distortion.

If you turn on View > Show Clipping, Audacity will put red lines in the waves that are too big.

Image

What kind of microphone is it? Dynamic (moving coil) microphones such as the Shure SM58 rock band microphone will put up with a lot of physical abuse and still work right.

Koz

CBJorgen
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Re: This doesn't look right... help!

Post by CBJorgen » Tue Jan 15, 2019 11:10 pm

Thanks for your response Koz!

The mic is a Rode NT1-A. I called their support line and they said that because it landed on a rug that was on top of concrete, and it was also in a shock mount, that it should not be damaged. As I said, I have not done any editing to the recording and I was aware of the loudness of the recording.

I was only concerned about the shape of the wave, as I have never noticed it being that way before. I was wondering, would I be able to send you a recording of my voice for your option of how it sounds. We have spoke in the past (2017). I am trying to start in voice over, but had a family medical situation that kind of grounded everything to a halt, so I am trying to get it started again. I just can't afford to pay professionals to help me.

I have created a vocal booth from a wood cabinet lined with shipping blankets and foam. It deals with the reflection of sound but is not soundproof. I just don't know if it's good enough for voice over. Any help you can offer would be very much appreciated.

Thank you,
Christian

Trebor
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Re: This doesn't look right... help!

Post by Trebor » Wed Jan 16, 2019 6:03 pm

CBJorgen wrote:
Tue Jan 15, 2019 11:10 pm
... I was wondering, would I be able to send you a recording of my voice for your option of how it sounds ...
It's possible to attach audio to posts, see ... viewtopic.php?p=214897#p214897

DVDdoug
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Re: This doesn't look right... help!

Post by DVDdoug » Wed Jan 16, 2019 7:59 pm

The positive side seems to be clipping slightly below 0dB (100%). (Audacity won't show that as clipping.) The waveform seems to be more symmetrical at lower levels.

That's probably your interface rather than the microphone. I've seen clipping below 0dB with computer mic-inputs or regular "cheap" consumer soundcards. You don't have a DC offset, which would show-up during as an offset during silence. (DC offset also comes from the soundcard/interface).

Since it sounds OK I wouldn't worry too much about it, but you should leave yourself some extra headroom to avoid clipping.

A high-pass filter at around 20Hz or higher should even-out the waveform,. Or you can try Normalizing with the Remove DC Offset option but you don't really have a DC offset, so check to make sure that cause a DC offset and shift silence off the zero-line. (I've forgotten how DC offset removal works, and I don't know if that can happen.)

CBJorgen
Posts: 42
Joined: Sun Oct 29, 2017 2:29 am
Operating System: macOS 10.15 Catalina or later

Re: This doesn't look right... help!

Post by CBJorgen » Thu Jan 17, 2019 8:45 am

To Trebor or Koz or DVDdoug:

Would love your feedback on the quality of my vocal recording. This is an untouched sample (no editing).
Audacity Vocal Sample.wav
(485.11 KiB) Downloaded 11 times
I would like to try and get into a career of Voice Over. My wife was diagnosed with Alzheimer's this past July. She was the major bread winner in the household, but has lost most of her income. I need to find a way to make money and be able to stay home with her. I have picked up everything I need, but need help with this software to make great recordings. Any help you can offer would be greatly appreciated. If I do good, I promise to donate to Audacity ASAP.

Thank you,
Christian

Trebor
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Re: This doesn't look right... help!

Post by Trebor » Fri Jan 18, 2019 10:39 pm

CBJorgen wrote:
Thu Jan 17, 2019 8:45 am
Would love your feedback on the quality of my vocal recording.
This is an untouched sample (no editing).
Audacity Vocal Sample.wav
Your voice is good.

The #1 technical problem is clicking.
There is a free de-clicker plugin for Audacity. It's capable of very good results, but it's very complicated to use, (and slow).

De-Clicker settings (2 pass) apply left one first.png
De-Clicker settings (2 pass) apply left one first.png (27.35 KiB) Viewed 309 times
original - declicked (2 pass) - the difference (the clicks isolated).wav
"hello" has the most obvious click
(1.99 MiB) Downloaded 11 times

BTW there are spurious sounds ...
A (chair ?) squeak on the word "work", and a motor/fan-noise on "station".

kozikowski
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Re: This doesn't look right... help!

Post by kozikowski » Sat Jan 19, 2019 12:29 am

I don't hear most of that, so that's between you and Trebor. All I got was a nice voice.

Can you post another one according to this recipe?

http://www.kozco.com/tech/audacity/Test ... _Clip.html

I do hear some of the odd background noises and they're messing up the measurement tools.

We had one poster who had a squeaky chair and he rocked back and forth nervously as he spoke. We allowed maybe he should stop doing that.

Koz

Trebor
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Joined: Sat Dec 27, 2008 5:22 pm
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Re: This doesn't look right... help!

Post by Trebor » Sat Jan 19, 2019 2:19 am

kozikowski wrote:
Sat Jan 19, 2019 12:29 am
I don't hear most of that, so that's between you and Trebor ...
The click on "hello" is in the 6kHz -10kHz range.
So if your speakers / headphones / ears don't operate well in that region you'll have difficulty hearing it.
It sticks out like a sore-thumb on the spectrogram ...

Hello - Hello (spot the difference).png
before - after DeClicker
Hello - Hello (spot the difference).png (322.7 KiB) Viewed 294 times
hello - hello.wav
before - after DeClicker
(163.03 KiB) Downloaded 13 times

CBJorgen
Posts: 42
Joined: Sun Oct 29, 2017 2:29 am
Operating System: macOS 10.15 Catalina or later

Re: This doesn't look right... help!

Post by CBJorgen » Sat Jan 19, 2019 7:55 am

Yeah, sorry, I wasn’t actually trying to keep everything quiet (wasn’t thinking). I was just looking for opinions on my voice and whether I had the sound reflection in control. Trevor, my god you must have sensitive ears! Honestly, I don’t hear any of that, that worries me. I’m not sure what clicking is. Is that a sound description or a technical term? I plan on using a solid chair that won’t make any sounds and will make sure everything is quite for my next recording that I will send to you this weekend.

I’m having to start out on the cheap. I am hoping that if all goes well, I will get better equipment and eventually build a soundproof booth in my man cave. I’ll attach a couple of pictures of what I’m working with now. I will also study up this weekend to learn some of this technology that you guys talk about. If you get to technical I’ll be lost lol.

Thank you sooooo much for your help!
Christian
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DF8C7C7D-7A4D-415D-B9CC-3DDC63BA10C1.jpeg (1.79 MiB) Viewed 286 times
F214E898-E07A-4823-BA29-C53BB8AE8C15.jpeg
F214E898-E07A-4823-BA29-C53BB8AE8C15.jpeg (1.28 MiB) Viewed 286 times

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