Izotope Rx 7 Elements Why Is Gain Hifh

Pro Tools Expert's review of iZotope's RX Elements. This new product aimed for users on a budget who want the additional power and features in the standalone version of iZotope RX but cannot afford RX6 Standard can now take advantage of this new product.

• Izotope Rx Elements Review
• Izotope Rx 5
• Izotope Rx Advanced

Module & Plug-in

IZotope, Inc. Is an audio technology company based in Cambridge, Massachusetts, United States.iZotope develops professional audio software for audio recording, mixing, broadcast, sound design, and mastering which can be used in wide range of Digital Audio Workstation (DAW) programs. Get the guaranteed best price on Virtual Instrument Content Software like the iZotope RX 7 Elements EDU at Musician's Friend. Get a low price and free shipping on thousands of items.

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.
  

  Tip

  You 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.

• 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.

• 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.

• 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

This image shows the spectrogram of a file with 3 harmonics of a 60 Hz Hum:

De-hum

De-hum 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. The De-hum 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 the De-noise module. For tricky hum problems, De-noise features tonal noise reduction controls that can make short work of any extra-harmonic hum and buzz. Some very high frequency buzz can also be removed with the De-click module.

Base Frequency

Sets the base frequency of the hum to be removed. The two most common base frequencies that cause hum are 50 Hz (Europe) and 60 Hz (U.S.). You can manually specify a base notch by choosing the Free option.

Note: When the De-hum module's 'Base Frequency' is set to 'Free,' you can use the Spectrum Analyzer (under View > Spectrum Analyzer) and its peak readout display to help find the exact peak frequency of any unwanted hum.

Manual/Adaptive

Adaptive mode will allow the De-hum module to adjust its noise profile based on changes over time in the incoming audio. In this mode, RX will analyze incoming audio for the specified learning time to determine what is hum and what is desired audio material. Adaptive mode can work better with sources that are constantly evolving.

In the Manual mode, the base hum frequency does not change over time.

Izotope Rx Elements Review

Learn

The De-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 set the Base Frequency to the result of the Learn calculation. RX can analyze any audio with prominent hum, if you don’t have a passage of pure hum. This is, however, less reliable than learning from only hum.

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 De-hum module, choose the appropriate frequency and then hit Preview to hear if this has an effect.

In some cases, you may need to choose the Free Frequency Type (e.g., when a recording made from analog tape is not precisely at its original recorded speed). 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 Peak Finding feature in the Spectrum Analyzer window. Simply single click to place RX's anchor sample on top of the hum you are trying to remove, and then drag your mouse over the peaks that appear in the Spectrum Analyzer window to view the exact frequencies of your audio.

Filter Q

Controls the bandwidth of filters for base frequency and harmonics.

Linear Phase filters

Enables linear-phase FIR filters with a high FFT size. De-hum’s linear phase filters have a very accurate frequency response at the expense of latency and filter pre-ringing. When this is disabled, De-hum will use minimum-phase IIR filters, which are only susceptible to post-ringing (which is usually less noticeable than the pre-ringing introduced by FIR filters).

High/Low-pass filters

These filters allow high/low frequencies to pass while attenuating low/high frequencies respectively.

• Frequency (Hz): sets the cutoff frequency for the filter
• Q: sets the bandwidth of the high-pass filter

Izotope Rx 5

Number of harmonics

Because higher frequency harmonics often result from hum, RX's De-hum 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 set how aggressively the higher harmonics are being cut. The Filter Q control adjusts the width of the hum filters.

60 Hz hum with harmonics

Link harmonics

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Links the gain of all of the filters, none of the filters, or odd/even filters.

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When harmonics are linked, this controls the slope of the gain/suppression. As the harmonic order increases, the gain/suppression level resolves closer to 0 dB. When linking type is odd/even, an odd/even slope separate control appears that allows you to control the amount of gain/suppression for both odd and even harmonics.

Izotope Rx Advanced

Harmonic gains (dB)

Gives numerical readout of gain settings in dB. You can also manually type in your gain settings for any of the harmonics.

Output hum only

By selecting the Output hum only checkbox, you can also hear 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, select this mode, and 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 effect on the program material.