So it’s not isolated or treated like a proper vocal booth or dedicated voice recording rooms. You can hear the room ambience and even though I’m using a broadcast dynamic microphone, which tries to reject any external voice, it is still not the best recording. Now let’s put RX's De-reverb to the test. Original audio. To record in the RX 6 Audio Editor: Create a new file. Press the Record button once to arm recording. The Record button will flash red when RX is armed to record. The meters to the right of the transport controls will update based on your input signal when recording is armed. 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.

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In the past, I’ve had numerous instances where I’ve recorded a vocal or voice over in not the most ideal of rooms. Rooms that are maybe a bit too big for the vocalist or that aren’t treated to absorb room reflections and ambiences. I wish I could have had a plugin like RX back then. When I got my hands on RX the first thing I wanted to try was the De-reverb feature, and man was I impressed. Let me walk you through how RX works regarding removing room ambiences to correct those not so ideal recordings.

IZotope RX and Sound Design: 13 Tips with Matt McCorkle Feb 05, 2020. Sound designer Matt McCorkle shares tips for creating soundscapes with iZotope RX, including how he captures ambience profiles and his tips for effective EQing. Should I remove iZotope RX by iZotope? Rescue your audio from the cutting room floor! With remedies for noise, clipping, hum, buzz, crackles, and more, RX 3 is the most robust and best-sounding audio repair toolkit on the market. Feb 09, 2015 RX 4’s visual editing tools make it easy to identify and remove unwanted sounds captured during the recording process. Download your free, 10-day trial: http. 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.

Your Over-Room Ambience Recording

So for demonstration purposes, I have recorded a vocal in a room that is not the greatest for voice recordings. Here is the vocal recording. It is a medium-big sized room that is open-plan to the adjacent rooms. So it’s not isolated or treated like a proper vocal booth or dedicated voice recording rooms. You can hear the room ambience and even though I’m using a broadcast dynamic microphone, which tries to reject any external voice, it is still not the best recording. Now let’s put RX's De-reverb to the test.

Original audio:

Loading Up De-reverb

First let's take a look at how to use RX as a plugin in your DAW, and then how you can use it as a standalone audio editor, as well as the extra features it has in the mode.

So in your DAW, add the RX De-reverb module as an insert plugin. You’ll see from your plugin list that you can add an instance of the RX module. Choose the De-reverb.

Then you need to learn the reverb type in the audio. To do this, click on the learn button and then play back the audio in your DAW. While playing back, the plugin analyzes the audio and sets up the parameters to what it thinks will remove the reverb from the sound the best.

Listen back—it does quite a good job. Notice how most of the reverb has been removed. That’s quite impressive!

After De-reverb Learn:

Editing the Parameters

Perhaps you want to tweak the results even further? Maybe too many artifacts have been introduced. Then you can dial back the Reduction fader, and even increase the Artifact smoothing dial to reduce this. If you tick the Enhance dry signal, this can also help, but may also introduce more artifacts. So it’s a bit of a balancing act, but I haven’t seen a plugin before that has as good results like this one, nice work RX!

You can also tick the ‘Output reverb only', and then hear just the reverb signal in the audio. Plus you can go in and change the amount on the Low, Low-mid, High-mid and Highs. So you have quite a bit of flexibility in altering how the reverb is removed.

In Standalone Mode

Standalone mode, or the Audio Editor mode, is slightly different in how it operates, as well as having some extra features not present in the plugin modules. Open up the standalone version of RX, and then drag the audio into the audio window. This will display the waveform.

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Now select the audio waveform—you can use the shortcut Command-A (Mac) or Control-A (PC). Navigate to the De-reverb module on the right panel.

Click the learn button to analyze the audio. You’ll see you don’t need to play back the audio. It’ll do the analysis without the need to playback in real time.

The rest is pretty similar to the plugin. You can edit the reduction amount, and the EQ bands. What is different is that you have different undo/saved states in the bottom right. When you first load your audio track, it’ll have the Initial State, and then each time you analyze the audio, it’ll create a new state. So you can compare by jumping back to the initial state, or make new states and compare the De-reverb settings.

Ambient Match

Another cool thing you can do in the standalone mode is use the Ambient Match feature. So let’s say you’ve gone in and edited out the gaps between the voice in your recording. This tends to break up the continuity of the sound in some cases. So what works well is to insert bits of the room ambience back into the sound. And the Ambient Match feature makes this super easy. Just make a small selection of an area on the audio waveform that contains some room ambience. Then choose the Ambient Match module on the right panel.

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Click on the learn button, and the room ambience in the track will be recreated. You can then either click Preview to hear how it sounds. If it’s not quite right, you can fine-tune your selection and learn it again. Then click Process to add this to the audio.

Setting the gain too high on a preamp meant you were distorting on the way in, and there was really no way to fix that.The De-clip plug-in, available in both RX Plug-in Pack and, is designed to essentially redraw the waveform as it would have been before clipping occurred, which means that now those takes can be rescued. Dealing with clipped audio is something that used to be very difficult and typically meant throwing out what was sometimes the perfect take. Before and After ExampleHere's another example of De-clip cleaning up a phone interview for a documentary program. Izotope rx declip.

Conclusion

That’s how easy it is to use the De-reverb module in the RX Audio Editor to remove and clean up the reverberated signal in your audio. I found that the plugin had removed quite a bit of the ‘background sound’, but at the same time, you could go in and tweak the parameters if you wanted to reintroduce some of that background noise back in, or edit how it was being removed in the different frequency bands. Plus you can use the Ambient Match feature to pull in room ambience that may have gotten removed when you edited the audio, which always comes in handy when you're doing hard edits on audio such as dialogue. This feature helps in making the audio feel more seamless after the edits. I’d really suggest using an application like RX if you are involved in quite a bit of voice and dialog work. It can help improve your voice recording and even save recordings you didn’t think you could even use.

Learn more about how to repair audio using iZotope RX with these video tutorials.

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.

Note: The RX Hum Removal module is effective for removing hum that has up to seven harmonics above its primary frequency. For hum that has many harmonics that extend into higher frequencies (often described as 'buzz'), try using RX's Denoise module. For tricky hum problems the Denoise features 'Tonal Noise' suppression controls under its Advanced settings.

Previewing the Hum

To begin, select a section of the recording where the hum is prominent. Sometimes there will be silence (or near silence) at the beginning or end of the program material that will contain noise but not any other audio. Otherwise, try choosing a quiet passage of the recording where hum is obvious.

Next, select the section of audio where the hum is most clearly audible. Choose the Loop Playback button. This will allow you to set Hum Removal's parameters as audio plays back.

Finding the Hum's frequency

When attempting to remove hum, you first need to find the hum's primary frequency. The two most common base frequencies that cause hum are 50 Hz (Europe) and 60 Hz (U.S.). Under the Frequency Type field in the Hum Removal module, choose the appropriate frequency and then hit Preview to hear if this has an effect.

In some cases, for example a recording made from analog tape that is not precisely at its original recorded speed, you may need to choose the 'Free' Frequency Type. Selecting this option unlocks the Base Frequency control and allows you to manually find the Hum's root note. With Preview engaged, move the slider up and down until you find the point where the hum lessens or disappears.

For even more precise settings, use RX's Spectrogram Display to zoom in on the project's low frequencies. Use the frequency ruler to the right to identify the Hum's Base Frequency. Hum usually appears as a bright horizontal line, sometimes with many less bright lines above it (harmonics).

Learn

The Remove hum module can also automatically locate the root fundamental of any hum in your audio. Simply make a selection containing the trouble frequencies, and click the 'Learn' button. This will automatically change the mode to 'Free' and set the Base Frequency to the result of the 'Learn' calculation. If the hum continues throughout the entire audio file, clicking on 'Learn' without previously selecting any audio, RX will analyze the entire audio file in order the find the Base Frequency of the Hum.

Spectrum Analyzer - By hovering your mouse near a peak in the spectrum, a readout will appear displaying the exact frequency of the peak, its amplitude, and the closest musical note. This can provide much higher accuracy than simply inspecting the graph, even with zooming in and/or increase the FFT size in the settings window. This can help users to find the exact peak frequency of any signal.

Attenuating Hum's Harmonics

Because higher frequency harmonics often result from hum, RX's Hum Removal module has control for attenuating these overtones. Using the Number of Harmonics control, you can select up to 7 harmonics above the primary hum frequency. Again, the spectrogram display in many cases makes it easy to identify the number of hum harmonics in your project. After selecting number of harmonics, use the Harmonic Slope control to how aggressively the higher harmonics are being cut. The Filter Q control adjusts the width of the hum filters.

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Using the Residual Output control

By selecting the Residual Output checkbox, you can also hear only the hum that is being removed. This is useful for fine tuning your settings. Play through a section of your file where the hum is mixed with other material, and select Residual output mode and then hit Preview.

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Now you can adjust parameters like the Filter Q (width) control and the Harmonic Slope control to maximize hum removal while minimizing the affect on the program material.

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Learn more about Hum Removal controls in the Reference Guide.