In this video, I’m going to cover how to use the brand new Dialogue Isolate module in RX 6 in a post-production context, using a sample that features dialogue.![Izotope Rx 6 Documentation Izotope Rx 6 Documentation](/uploads/1/2/6/0/126034288/623318147.jpg)
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IZotope’s RX 6 is here and so is master trainer Joe Albano with an in-depth look at every module included in the RX Advanced collection. Join him in this course, and learn how to repair, enhance, and restore damaged audio you thought was unrecoverable. Mar 28, 2018 Description: iZotope RX 6 Advanced – the most complete software solution for sound restoration in the modern market, a unique stand-alone application, designed from scratch to combat the full range of problems arising from audio. Added Japanese translations to the RX 6 Help Documentation.
Once you’ve downloaded the test file called, “Post Production_Dialogue Isolate,” for this tutorial from the RX web page, and opened it in RX 6 by clicking and dragging it into the RX application window, or by opening RX 6 and pressing Command+O or Control+O on a PC to locate and open the sample, your RX window should look like mine, with the file, “Post Production_Dialogue Isolate” in a tab on the top-left hand side of the screen.
Informed by machine learning to recognize and separate spoken dialogue from non-stationary background noise, such as crowds, traffic, footsteps, weather, or other noise with highly variable characteristics, Dialogue Isolate can be particularly effective at increasing the level of dialogue in challenging, low signal-to-noise ratio conditions.
Have a listen to this sample, which features some dialogue, and a very noisy background.
[voice sample]
![Izotope Rx 6 Documentation Izotope Rx 6 Documentation](/uploads/1/2/6/0/126034288/623318147.jpg)
Let’s use Dialogue Isolate to bring the dialogue center stage, and attenuate some of that background noise.
First, we see some parameters in the module. Dialogue gain controls the gain of the components in your audio recognized as speech. We can leave this slider at 0dB to reduce noise, or lower the slider to reduce the level of spoken dialogue.
In this case, we want to reduce noise, and bring the dialogue center stage, so we’ll leave it at 0dB.
Noise gain controls the gain of the components in your audio recognized as noise. We can keep the slider low to increase dialogue intelligibility, or increase it to 0dB while turning down dialogue gain to only hear the isolated noise.
Given the nature of our example, I’d like to really bring down the noise gain so that we can focus on the dialogue as much as possible.
Next, we have separation strength. For large values, meaning if I slide it to the right, the processing will more strictly define what it classifies as dialogue, which can result in more background noise reduction at the cost of possible reduction of speech.
For small values, if I slide it to the left, the processing will more broadly define what it classifies as dialogue, which will allow more background noise through, but will reduce the possibility of speech loss as a result of the processing.
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Again, dialogue is king in this example, so I’ll bring my separation strength to 10. I should note that Dialogue Isolate will still process, even when the reduction strength is set to zero.
Let’s press process and listen back to our results.
I’ll press space bar to play our newly dialogue isolated track.
[voice sample, processed]
Here’s before.
[voice sample, unprocessed]
And here’s after.
[voice sample, processed]
Now, I’m still hearing a few clicks in the background, so I’m going to run Dialogue Isolate once more with the same settings to really get the best possible results, given this noisy sample.
Let’s hear the results.
[voice sample, processed twice]
Rx 6 Supplement
So here’s the initial state before we did any processing with Dialogue Isolate.
[voice sample, unprocessed]
And here’s after.
[voice sample, processed]
For more information, tutorials, and to download your own samples to use with RX 6, head to izotope.com/RX.
Module & Plug-in |
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Overview
De-hum is designed to remove persistent tonal noise, like the AC hum that can be caused by poor electrical grounding. De-hum includes a series of notch filters that can be set to remove both the base frequency of the hum, usually 50 Hz (Europe) or 60 Hz (USA) as well as any harmonics. The De-hum module is effective for removing hum that has up to seven harmonics above its primary frequency.
Controls
- BASE FREQUENCY: Sets the fundamental frequency of the hum to be removed. The Free option unlocks the Notch Frequency control and allows you to manually identify the fundamental. With Preview engaged, adjust the slider until you find the point where the hum is appropriately reduced.TipYou can also use the Spectrum Analyzer to help identify the base frequency of the hum.
- SUGGEST: De-hum can intelligently identify the noise profile of the hum in your audio. Make a selection containing the hum in isolation, and click the Suggest button. This will automatically set the Base Frequency based on the learned profile. If you cannot find a selection of hum in isolation, RX can analyze any audio with prominent hum, but the results may not be as useful.
- ADAPTIVE MODE: Allows De-hum to adjust the notch filters based on changes in the audio over time. In this mode, RX will analyze incoming audio to determine what is hum and what is desired audio material. Adaptive mode will work better with hum that changes in pitch throughout the file.
- FILTER Q: Controls the bandwidth of the notch filters for the base frequency and all of the harmonics.
- LINEAR-PHASE FILTERS: Linear-phase enables FIR (Finite Impulse Response) filters with a high FFT size. These filters provide very accurate frequency response with no change in phase at the expense of latency and filter pre-ringing.Disabling Linear Phase (FIR) filters
- When Linear Phase is disabled, De-hum will use minimum-phase IIR filters. These are also very accurate, and are only susceptible to post-ringing, which is usually less noticeable than the pre-ringing introduced by FIR filters.
- Latency Consideration: Disabling Linear Phase Filters will reduce the latency used by De-hum when it is being used as a real-time plug-in.
- When Linear Phase is disabled, De-hum will use minimum-phase IIR filters. These are also very accurate, and are only susceptible to post-ringing, which is usually less noticeable than the pre-ringing introduced by FIR filters.
- HIGH/LOW-PASS FILTERS: These traditional filters come ahead of the De-hum notch filters, and allow for frequencies to pass above or below a certain cutoff point. These can be useful for tackling extreme hum or buzz.
- FREQUENCY [Hz]: sets the cutoff frequency for the filter
- Q: Sets the bandwidth of the filter (or dB/octave cut). In the default IIR filter mode with a high Q setting, you may notice a resonance at the cutoff frequency characteristic of traditional analog filters. That resonance can be mitigated by engaging the Linear-phase filters.
- FREQUENCY [Hz]: sets the cutoff frequency for the filter
- NUMBER OF HARMONICS: Because harmonics often accompany the fundamental frequency of a hum, De-hum can also attenuate these overtones with notch filters. Using the Number of Harmonics control, you can select up to 7 harmonics above the fundamental. The spectrogram display can make it easy to identify the harmonics. After selecting the number of harmonics, use the Slope control to set how aggressively the higher harmonics are attenuated.
- LINK HARMONICS: Connects the gain controls of the notch filters.
- ALL: presents a single node on the display for controlling the gain of all the notch filters. This is the default setting.
- ODD/EVEN: presents two nodes on the display, one for controlling the gain of the fundamental frequency and even harmonics, and another for controlling the 1st harmonic and any following odd harmonics.
- NONE: presents individual gain nodes for the fundamental and each harmonic.
- ALL: presents a single node on the display for controlling the gain of all the notch filters. This is the default setting.
- SLOPE: When harmonics are linked, this controls the harmonic slope of the gain nodes for each overtone. As the harmonic order increases, the gain level resolves closer to 0 dB. When the Link Harmonics control is set to Odd/Even, a separate control appears that affords independent control over the slope for both odd and even harmonics.
- HARMONIC GAINS [dB]: This section provides a numerical readout of the notch filter gain settings in decibels. You can also manually enter gain settings for the fundamental, or any of the harmonics if Link Harmonics is set to None.
- FILTER DC OFFSET: This checkbox will engage a filter to remove any DC (direct current) offset that sometimes occurs in A/D converters or analog circuits used in the recording process.
- OUTPUT HUM ONLY: Selecting this check box will isolate the hum that is being removed. This is useful for fine-tuning your settings. Identify a section of your file where the hum is mixed with other material, select this mode, and click Preview. Now adjust parameters like Filter Q and Slope control to maximize hum removal, thus minimizing the effect on the program material.
More Information
Izotope Rx Manual
Alternative Modules to use for Complex Hum Issues
- Spectral De-noise For hum that has many harmonics that extend into higher frequencies (often described as “buzz”), try using Spectral De-noise. Spectral De-noise features tonal noise reduction controls that can make short work of harmonic hum and buzz across the entire spectrum.
- De-click Some very high frequency buzz can also be removed with the De-click module.
Rx 6 Fat Burner
Visual Example
Izotope Rx 6 Documentation Download
This image shows the spectrogram of a file with 3 harmonics of a 60 Hz Hum: