They're here! More Muvipix.com Guides by Steve Grisetti!
The Muvipix.com Guides to Premiere & Photoshop Elements 2019
Not quite sure what our site has to offer?
Check out the
Muvipix Video Tour

how to improve low quality audio files?

Talk about anything audio here. From video narration to podcasting, MP3s to MP4s - whatever your flavor, this is the place.

how to improve low quality audio files?

Postby MGadAllah » Thu May 29, 2014 4:45 pm

I've a friend, he is a teacher and he gave many lectures in a public places and recorded his lectures using poor mp3 player device.
Now he would like to make in a better quality in order to publish it on public.
This is the copy of an example:-
https://www.dropbox.com/s/7k9h9rputarjs7u/C002.WAV
I tried Adobe Audition, 1) Ctrl+P. 2) Ctrl+A. 3) Ctrl+Shift+P.
But I am afraid that the quality still not good.
Please may someone help me and tell me what to do using audition or any other software to make the audio more good?
Thanks a lot :)
User avatar
MGadAllah
Senior Contributor
Senior Contributor
 
Posts: 346
Joined: Sat Oct 09, 2010 8:27 am
Location: Egypt - Cairo

Re: how to improve low quality audio files?

Postby Kent Frost » Thu May 29, 2014 11:04 pm

Ouch. Not aware of any way to up the quality of really anything if it starts out low. The thing to do is start with high quality raw material and then, if you need to, generate lower quality (read: internet speed-friendly) versions of the final edits for delivery. Unfortunately, you can really only take quality away, not add it. Maybe someone out there knows a trick or two, but that's always been the rule as far as I've ever known.
Dell Studio XPS 8100, Intel Core i7 2.8GHz, 4GB RAM, 64-Bit Win7. Camera gear: 2x Canon 550D's, 1x Canon EOS 6D body, Sigma 70-200mm f2.8 & 17-50mm f2.8, Canon EF 50mm f/1.8 & 24-70mm f/2.8L, and two 420EX flashes.
User avatar
Kent Frost
Moderator
Moderator
 
Posts: 338
Joined: Mon Oct 14, 2013 2:48 pm

Re: how to improve low quality audio files?

Postby Bob » Fri May 30, 2014 1:46 am

That's pretty poor quality. Besides the noise, there is also reverberation/echo and distortion on the voice.

You should be able to clean up much of the noise in Audition. But, it's a balancing act between reducing the noise and not affecting the voice too much. With this poor quality, don't expect miracles. Here's the basic procedure. Did you basically follow this?

First load the audio file and display the waveform editor. Here I dragged the bottom of the frame up to display the spectral display also. Zoom into the waveform until you can easily find the space between the words.

noise1.jpg


Open the noise reduction effect (keyboard shortcut ctrl+shift+p). If you haven't sampled the noise yet, you'll get a message to do so like this screen capture. Select one of the spaces between words that is typical of the noise you want to remove and click "capture noise print".

noise2.jpg


After you take the sample, click on "select entire file". It should look something like this:

noise3.jpg


Now you need to play with the settings to find the best noise reduction. The two main sliders to adjust are "reduce noise" and "reduce by". Start with a setting of about 60% and 30db respectively. At the lower left corner there is a preview play button. Click it to hear the audio as you make adjustments of each up and down until you find a setting that reduces noise without drastically altering quality the voice. I also adjusted the "spectral decay rate" in advanced. I thought 25% sounded better. When you are satisfied with the results, click on apply.

For comparison, here's what the waveform/spectral display looked like with the 60/30 setting.

noise4.jpg


And, here's what it looked like with a 100/60 setting:

noise5.jpg


Notice the last one had removed almost all of the noise, but the voice waveform is noticeably different. I thought the 60/30 actually sounded better with less distortion.
You do not have the required permissions to view the files attached to this post.
User avatar
Bob
Moderator
Moderator
 
Posts: 5758
Joined: Wed Feb 21, 2007 4:49 am
Location: Southern California, USA


Return to Editing / Conversion / Formats 


Similar topics

TS Files
Forum: Water Cooler
Author: Little Nac
Replies: 11

Audio Repair Plug-ins
Forum: Water Cooler
Author: sidd finch
Replies: 1

Premiere Elements Preview Files
Forum: PRE Version 10
Author: Johnny
Replies: 5

Easiest way to remove/mute brief amounts of audio?
Forum: Vegas
Author: cgwaters
Replies: 6

Audio trouble
Forum: Water Cooler
Author: karri
Replies: 11


Who is online

Users browsing this forum: No registered users and 1 guest

cron