When to use Hum Removal Hum removal is designed to remove low frequency buzz or hum from your audio file. Hum is often caused by lack of proper electrical ground. This tool includes a series of notch filters that can be set to remove both the base frequency of the hum (usually 50 or 60 Hz) as well as any harmonics that may have resulted. Apr 24, 2017 DeRustle: Removing Lavalier Microphone Noise with Deep Learning Posted on April 24, 2017 By inconspicuously attaching on clothing near a person’s mouth, the lavalier microphone (lav mic) provides multiple benefits when capturing dialogue.
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Ableton Live is a treasure trove for musicians, sound designers and audio editors. It turns out you can create a de-noise module without 3rd party plug-ins if you know how. Joshua Casper shows how!
I love RX by iZotope. I especially love the dialogue/vocal de-noise module. I just click the button, sample a bit of the background noise, and run the algorithm. Next thing you know the noise is gone and there is a minimal effect to the dialogue or vocal. The one downfall of RX is its price. It is completely worth it if you need to use it a lot, but for those of us on a budget the price tag can be a bit hefty… especially if we only need it every now-and-then.
The De-hum audio plug-in and module in iZotope RX automatically identifies the base frequency of unwanted hum and precisely removes it from the recording along with harmonics, ensuring a clean overall sound without electrical interference. Remove noise from video recordings. Using a denoiser VST with Adobe Audition and other softwares. Advanced noise reduction techniques with iZotope RX. Best practices when it comes to recording audio outdoors. First of all, you must understand that it’s impossible to remove 100% of the noise from a recorded audio. It’s not possible.
This got me thinking. Is there a way to get similar results using audio effects native to Ableton Live?
And, as it turns out, there is. It isn’t on the same level as RX, but it gets the job done and what’s more, it is automated. Let’s find out how to do it!
Step 1
First record some dialogue or a vocal. I am using this clip I recorded directly into my phone. This is what the original sounds like +9.5 dB.
AUDIO SAMPLE: original plus 9.5 dB.wav:
Now, before we get into the de-noising process we can clean this up a little bit. I am going to throw a simple EQ on it to boost the high frequencies and trim the ultralow end.
AUDIO SAMPLE: original plus 9.5 dB - EQ.wav:
Step 2
Now for the important part. This needs to be done before we being the de-noising process.
We need to use a compressor to even out the dynamic range of the vocal. Don’t worry though, it’s really easy to do. Just put a Glue Compressor after the EQ and turn the threshold down to -15 dB.
![Izotope hum removal tool Izotope hum removal tool](/uploads/1/2/6/1/126140970/232606505.jpg)
This value is going to be different for every vocal clip.
What you are looking to do is bring those really high peaks down with some gain reduction so the overall volume is closer to being the same level throughout the clip. This is going to help us in the near future. Obviously you don’t want it to be flat, but bringing the peaks down a couple dB should be fine. You can see how many dB of gain reduction is being applied by watching the Glue Compressor’s needle and how far it peaks.
AUDIO SAMPLE: original plus 9.5 dB – EQ - Glue.wav:
It may be a little difficult to hear the difference so here are what the before and after waveforms look like.
Step 3
Now we are ready to start the de-noise process. What I do is duplicate the original channel, so we can always go back. Then on the new duplicate I freeze and flatten the track making the EQ and Compression permanent.
Next, I duplicate that new channel. That should leave you with 3 channels in total. You can deactivate the audio on the first channel as we don’t want or need to hear it.
Now take a Utility Audio Effect and drop it on the third channel. Then click the Phz-L and Phz-R buttons at the bottom of the device. This is inverting the waveforms for the left and the right channels. If you play the second and third audio tracks together right now you should hear nothing as the exact opposite waveforms will cancel each other out when they get mixed together in the master channel. Don’t worry, that’s OK!
Now, for the magic.
Step 4
Solo the third channel—the channel with the Utility device on it. Take the Gate Audio Effect and drop it behind the Utility device. Click the “flip” button, because we want the gate to allow everything except what passes the threshold. Also turn on the “Lookahead” to 10 ms - I found this helps with the very short attack settings we will be using.
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Now you need to adjust the Threshold and the Return parameters so the vocal is set right in between the two.
When the dialogue is being played you should hear the noise section but the vocal itself begin to be cut out. Get it close. Don’t forget to set the floor to, so that you can’t hear any of the dialogue or vocal coming through. We want just noise.
This is the goal here. You want the gate to cut out the audio when there is someone talking or singing and ONLY at those moments. The Attack and Release parameters will help to smooth things out after the other parameters are set.
This were my final Gate settings.
Now we can play the second and third channels together and the large areas with just noise will be completely quiet and the dialogue will be allowed to pass through. That will save a boat load of time right off the bat!
Now, the part with the dialogue with still have the noise, so this method is a little limited. But, overall we already have a massively improved result that will handle itself no matter how long to the audio clip is.
![Instructions Instructions](/uploads/1/2/6/1/126140970/292081921.jpeg)
Step 5
However, there is one more trick we can pull off to clean up that final output a bit more.
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Go back to the original clip, drop a spectrum analyzer on the channel, and loop a section of just noise. Look for any clear peaks in the spectrum. That is where the noisiest parts are. As you can see from the picture below there is a big problem around 15 kHz and something fishy around 330 Hz.
We can use an EQ 8 on the master channel to precisely remove those sections. Now when the dialogue comes through the gate the noise will be reduced a bit at the frequencies. Here is what my master channel EQ looks like.
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Now all we need to do is take a listen to the final output. And, to be honest, I am rather impressed with the results. Go ahead and A|B the original with the final and let us know what you think!
FINAL Audio
AUDIO SAMPLE: final output.wav:
ORIGINAL Audio
AUDIO SAMPLE: original plus 9.5 dB – EQ - Glue.wav
Learn more Ableton Live tips and tricks in the AskAudio Academy here.
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Izotope Hum Removal Instructions
iZotope RX 5 Audio Editor Final is an ultimate audio noise removal and loudness control software designed for professional audio and video editing to improve the sound quality, reduce noise and resolve audio problems to recover the high-quality of a sound file. If you own or create a movie and you want to adjust the sound level to a normal status then this program is what you need. It helps you to remove unwanted sound noise from video/audio without using Audacity, repair clipped samples and remove clicks from samples.
iZotope RX 5 Audio Editor Advanced 5 Key Features:
iZotope RX 5 Audio Editor offers a number of tools to select the audio signal on the spectrum. Repair an MP3 audio file and fix a corrupted audio file. This allows users not only on audio editions based on the heard sounds, but also by means of the sense of sight. Among the options available to you will find, among others, tools such as selecting the time and the frequency of the sound tool and magic wand, that brush laso precise marking of audio signal amplitude spectrum chart.
Izotope Hum Removal Reviews
iZotope RX 5 Audio Editor Advanced 5 features by default, such a plugin Denoise, Declip, Spectral Repair, Declick, Decrackle & Remove Hum RX 2 Advanced adds an Adaptive Denoise mode, Deconstruct and Azimuth Alignment, Spectrum Analyzer, EQ or Gain. The functionality of the application, you can expand by installing additional plug-ins VST and DirectX. In practice, the program iZotope RX 2 Advanced successfully can be used for such tasks as recording music, post-production audio in the movie industry, improving audio quality when conducting phone interviews, processing audio from cassette tapes and vinyl records, etc.