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. Jul 27, 2017 Don’t let hum noise ruin otherwise perfect guitar recording. In this video, we show you how to use RX Elements’ De-hum module to quickly and easily remove hum noise. Electrical interference. Aug 29, 2017 This page is not a recommendation to uninstall RX 6 Elements by iZotope, Inc. From your computer, nor are we saying that RX 6 Elements by iZotope, Inc. Is not a good application for your computer. This text simply contains detailed instructions on.
When to use Hum Removal
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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
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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.
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.
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.
Izotope Rx 6 De Hum 1
Learn more about Hum Removal controls in the Reference Guide.
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.
![Izotope Rx 6 De Hum Izotope Rx 6 De Hum](/uploads/1/2/5/6/125657466/786176036.png)
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
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.
Visual Example
Izotope Rx 6 De Human Body
This image shows the spectrogram of a file with 3 harmonics of a 60 Hz Hum: