Izotope Rx Fill In With Another Mic

Resample

Resample allows you to convert an audio file from one sampling rate to another.

Sample Rate Conversion (SRC) is a necessary process when converting material from one sampling rate (such as studio-quality 96 kHz or 192 kHz) to another rate (such as 44.1 kHz for CD or 48 kHz for video).

It is common to record and edit in high sampling rates since higher rates allow higher frequencies to be represented. For example, a 192 kHz audio sample can represent frequencies up to 96 kHz whereas a 44.1 kHz audio sample can only represent frequencies up to 22.05 kHz. The highest frequency that can be represented accurately by a sampling rate is half of the sampling rate, and is known as the Nyquist frequency.

I've used Algorithmix Noisefree and Renovator which were amazing but I am not sure if they are still being developed and Algorithmix stuff is uber expensive. I remember that worked better than iZotope RX for decrackle/declick at one stage a few years back, not sure if it is still true. Adobe Audition has a good noise reduction and spectral repair. Today, we’re going to put the Vocal Chain Bundle to the test by creating a beat with vocal sounds and objects recorded on a laptop microphone, using Nectar 3 and VocalSynth 2 to polish the recordings. Afterward, we’ll perform some audio editing with RX Elements, do some sampling, and light processing to create a viable beat. Sep 14, 2018  In this video tutorial, Joshua Casper shows you how to isolate any vocal from any track using the brand new Music Rebalance module in RX7 by iZotope.

When reducing the sampling rate, or downsampling, it is crucial to remove the frequencies that cannot be represented at the lower sampling rate. Leaving frequencies above this point causes aliasing. Aliasing can be heard as the frequencies in an inaudible range are shifted into an audible range, causing distortion and noise. With iZotope SRC's steep low-pass filter, users can completely avoid the common aliasing artifacts while maintaining the maximum frequency content. A comparison of iZotope’s SRC process versus other sample rate convertors can be viewed at: http://src.infinitewave.ca/

You can also engage the Post-limiter option in order to limit the output levels of your signal to prevent any clipping from occurring.

Note: The Aliasing portion of the curve displayed in red shows the reflected frequencies during downsampling or imaged frequencies during upsampling — both due to aliasing.

New sampling rate

This setting chooses the sampling rate you want to convert to. Choose a sampling rate from the drop-down list, or click on the field to type in a custom sampling rate.

Change tag only

Changes the declared sampling rate of the file in the file’s properties without resampling the file, effectively changing the playback rate and pitch of the file.

This feature is useful if the sampling rate tag was damaged by a previous audio editing process and the file is playing back incorrectly.

Filter steepness

This allows you to control the steepness of the SRC filter cutoff. The white line is representative of an ideal low-pass filter.

Higher filter steepness means better frequency performance of the filter: wider passband retains more useful signal, while stronger stopband attenuation provides better rejection of aliasing. At the same time, higher steepness of the frequency response requires a longer filter, which produces more ringing in time domain and energy smearing near the cutoff frequency.

Cutoff shift

SRC filter cutoff frequency shift (scaling multiplier).

Allows shifting the filter cutoff frequency up or down, to balance the width of a passband vs. amount of aliasing.

Pre-ringing

SRC filter pre-ringing amount in time domain (0 for minimum phase, 1 for linear phase, or anywhere in between).

Adjusts the phase response of the filter, which affects its time-domain ringing characteristic. The value of 0 produces a minimum-phase filter, which has no pre-ringing, but maximal post-ringing. The value of 1 produces a linear-phase filter with a symmetric impulse response: the amount of pre-ringing is equal to the amount of post-ringing. Intermediate values between 0 and 1 produce so-called intermediate-phase filters that balance pre- and post-ringing while maintaining linear-phase response across a possibly wider range of frequencies.

Post-limiter

Keeps true peak levels of the output signal below 0 dBTP to prevent any clipping from occurring.

This option is important when resampling signals that are very close to 0 dB, because filtering during resampling can change peak levels of a signal.

iZotope’s RX suite of audio repair modules is usually thought of as a post-production or mastering tool, but it has many music and mixing applications as well. Here are a few of them.

Vocal Cleanup

One obvious application for both music and post is vocal cleanup; whether spoken or sung, vocal tracks often present a number of familiar problems that may need to be addressed, and RX has several modules that do just that.

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The De-plosive module automatically detects and eliminates plosives—also known as p-pops—the annoying bassy thumps that can occur on certain letters, like P and B. Removing them by hand is easy enough, but it can involve some tedious manual editing, like cutting the Region at each offending pop and fading in over the plosives to tame them. After a couple of simple settings, De-plosive does this automatically, saving lots of time over the course of an afflicted track.
De-ess addresses the equally familiar problem of harsh sibilants—“S”-sounds—but offers an extra twist over conventional dynamics processors. Besides the usual filtered-sidechain method, De-ess includes an option that utilizes spectral shaping, for especially difficult or problematic situations.
The Breath Control module automates the process of removing breath sounds—or better, minimizing them without removing them entirely, for a more natural quality. Depending on the vocal performer and the mic setup/position, this might take a little experimentation to find just the right sensitivity settings to minimize breaths without softening some consonants too much, but if you don’t try to completely eliminate the breaths, it can work very well—again, saving a lot of time that would be better applied to more creative aspects of a mix.
RX offers no less than two de-clicking modules: the regular De-click, which is good for random clicks like from a vinyl record, and Mouth De-click, which is especially tuned for removing mouth clicks—those little lipsmacks that can be particularly difficult to edit out. This module does an exceptionally good job on these noises, without any noticeable adverse effect on the vocal itself.

Clipping

RX’s De-clip addresses the universal problem of clipped audio—nowadays that could be audio that’s been clipped at the ADC—Analog-To-Digital Converter—resulting in the typically unpleasant digital distortion that can ruin an otherwise good take, an occasional problem when performers get a little more intense in a recording session after the level check. I’ve always followed the traditional warning that digital clipping should be considered a potentially unrecoverable error to be avoided at all costs, but I’ve thrown a number of tracks at De-clip and it’s handled them all easily, restoring clean, usable audio to even some really harsh clipped vocal tracks.

RX’s De-clip module is capable of repairing clipped audio Audio example 1 A clipped vocal recording; the clipping repaired with De-clip

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Wet->Dry

In modern music sessions many, if not most, tracks are close-miked and fairly dry, with reverb and ambience added at the mix stage, to taste. But sometimes a track may be overly ambient, and may not blend in properly in a mix that’s going for a tighter, more “studio” quality; or a vocal may pick up a little too much room tone, making it recede excessively into the mix. It’s much easier to add reverb than to take it away, but De-reverb addresses this issue, with surprisingly good results.

De-reverb can remove excessive ambience from a recording

As with some of RX’s other processors, Re-reverb does best when it can “learn” the reverb signal, ideally from a section of just reverb (like a long tail that defines the spectral content of the reverberation/ambience), but it does a credible job even when this isn’t possible. There are a few more controls here than in some of the other modules mentioned so far, and it may take a little more experimentation to get the best results while avoiding any artifacts of the processing, but I’ve been able to remove a fair bit of unwanted ambience from various guitars and other tracks, with suitably clean results.

Guitar with excess ambience; the same track with the ambience reduced by De-reverb
There’s also a module that will try to match the sound of ambience in one track to that in another track; this is probably less commonly needed in music projects than in post-production, but it could conceivably come in handy as well.

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Auto-EQ

On occasion in a mix session, it may be necessary to apply EQ to a recording to match the overall tonal balance of another; a common application for this in mixing might be when comping a final track from multiple takes. It’s not unusual for the tone to change noticeably over the course of recording several takes of the same part—a vocalist may shift position on mic, or a guitarist may fiddle with pickup selection or the amp’s tone controls for example. When the comp is made, some sections that are chosen may stick out due to these small tonal variances, and it can be a bit of a pain to get the tone to match closely enough so that the different edits in the comp won’t call attention to themselves.
RX’s EQ Match module is designed to make short work of this. Once again, there’s a learning process employed—the module first “learns” (analyzes) the tonal signature of the target file, then also analyzes the audio to be EQ’d, and applies EQ to it to match the desired tonality. It’s all automatic, but there is a control for determining the amount—the strength—of the applied EQ curve, which can be a great help in smoothing out what could otherwise be an overly sharp tonal change.

EQ Match generates a curve automatically to match the tone of one piece of audio to that of another

Spectral Processing

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The most well-known of RX’s processing tools has always been its Spectral Repair module - actually there are several modules that can be used to remove unwanted sounds buried within an audio recording. Once again, this is a universal problem—in music projects it might rear its ugly head as a siren that leaks into a vocal mic, a snare that shows up a little too strongly in a piano recording, or the cross-bleed between the vocal and acoustic guitar tracks of a singer who needs to play and sing together. There are also more ambient sounds that may compromise a recording, like the hum of an air-conditioner.
Several modules in RX can be applied to these common problems: De-hum selectively filters out AC hum—up to eight harmonics’ worth—even on bass tracks, without a noticeable thinning of tone. And the Spectral De-noise and Voice De-noise modules both learn the spectrum of the unwanted noise—like the whiny whoosh of a window AC unit—and then remove it seamlessly from the track; Voice De-noise is specifically tuned to removing such noises from vocal tracks.
For more difficult problems, the main Spectral Repair module provides a full Spectrogram display, and lets the user draw out unwanted sounds graphically. Obviously this will likely be a bit more time-consuming, but it can often salvage a track that would otherwise be ready for the trash. When the unwanted sound is less-correlated—i.e. noiselike—than the main audio, the Deconstruct module may be able to handle it more automatically.

Fig 5 RX’s Spectral Repair lets the user draw out unwanted sounds embedded in the audio

A squeaky piano bench removed by spectral processing

Bleed

Finally, a potential issue for any music session is headphone bleed. As performers record with a mix of the track in their headphones, the familiar tst-tst-tst of sound leaking out of headphones not adequately sealed over the ears (for whatever reason) might be picked up by a close mic and intrude to an unacceptable degree on the recording. While a number of RX’s modules could try to address this, RX has one specifically geared to this exact problem—De-bleed.

The De-bleed module can eliminate problematic headphone leakage

To make this work better than other modules that might attempt the same thing, De-bleed needs you to have access to the track that bled into the mic—that is, the track the performer was monitoring in the headphones that leaked into the recording. Ideally this would be applied while that exact headphone mix is still dialed up in the mixer, so De-bleed can learn it and then apply that to the task of removing it from the main audio in the recording.

However, I’ve tried it even well after the session, by approximating what I thought would have been in the monitor mix at the time the leakage occurred, and letting De-bleed learn that approximation, and it still worked quite well. You have to make sure that the reference track is more or less time-aligned with the leakage in the main track, which might involve doing a quick trim/edit to a copy, but this will help the process work much more effectively.

A vocal recording with headphone leakage; the same track after processing with De-bleed

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Final Word

RX has even more modules that might be pressed into service in a music session in special circumstances, but the ones described here could end up being mainstays for recordists and mixers who frequently need to clean up their tracks before delving into the creative aspects of the mix. Besides RX Advanced, which includes all the modules I’ve described here, iZotope has a couple of smaller bundles that make some of these modules available at a lower price point. Either way, with a few exceptions most of these processes won’t be found in your DAW, and they can sometimes save the day when technical problems threaten to get in the way of a great mix, so this kind of processing is definitely worth a good look.

Learn more iZotope RX tips and tricks: https://ask.audio/academy?nleloc=category/audio/application/rx

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