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Izotope Rx Sample Rate

18.06.2020
  1. Izotope Rx Sample Rate Conversion
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Overview

De-bleed reduces the leakage of one signal into another, such as when vocals bleed into a guitar microphone, or when a click track fed into headphones bleeds into an open mic.

The De-bleed module learns a bleed relationship between two tracks. In the descriptions below, these two tracks are referred to as:

  • BLEED SOURCE TRACK: This track contains only the bleed source audio.
  • ACTIVE TRACK: This track contains the audio present in your source track (bleed), mixed in with the audio you want to preserve.

De-bleed relies on a relationship existing between your Active track and Bleed Source track in order to function properly and provide the best results. In order to properly establish the relationship between the Active and Bleed Source tracks, the following requirements must be met:

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De-bleed requires 2 tracks to process
De-bleed requires 2 tracks (Bleed Source Track & Active Track) to be open in the RX Audio Editor.
Bleed Source and Active Track must have matching sample rates
The sample rates of the Bleed Source Track and Active Track must match in order to process using De-bleed.
Using tracks of different sample rates may indicate that the tracks are not related.

Tip: How to correct sample rate differences

If you need to correct the sample rates of your bleed source and active track selections in the De-bleed module, you can use the Resample module in the RX Audio Editor to correct sample rate differences between your files, if necessary.

Time alignment of the Bleed Source and Active tracks is important
The Bleed Source Track and Active Track must be time aligned within a few milliseconds of each other.
“Time aligned” means that if the two files were played back together, they would sound in sync. So if the same audio events are occurring at the same points in the timeline for both the Bleed Source and Active tracks, this means they’re time aligned.

Tip: How to correct time alignment issues

You can adjust the length or timing of files in the RX Audio Editor by:

  • Using the “Cut” edit operation, Command+X (Mac) or Ctrl+X (Windows), to remove the active selection.
  • Insert Silence using the Signal Generator module to adjust the length of your file.

Workflow

  1. Import the bleed source file (“Bleed Source Track”) and the file you are removing bleed from (“Active Track”) into the RX Audio Editor. Ensure that the files are in sync (instructions above).
  2. Open the De-bleed module.
  3. Ensure that the “Active Track” name that is displayed in the De-bleed module is the file you wish to modify.
  4. In the De-bleed module, select the Source Track from the “Bleed Source Track” drop-down menu.
  5. In the active file tab (Active Track), make a selection where the bleed is most obvious.
  6. Click the Learn button in the De-bleed module. (Learn analyzes the general relationship between the Bleed Source and the Active Track.)
  7. After the Learn pass is complete, select part or all of the Active Track and click Process.

Controls

  • BLEED SOURCE TRACK SELECTION MENU: Select the Bleed Source track from this dropdown.

  • ACTIVE TRACK: Displays the name of the track tab you are currently viewing.

  • LEARN: Learns the relationship between the two tracks.

  • BLEED PROFILE DISPLAY: After learning the bleed profile, this displays a portion of the relationship captured between the two tracks. Toggle between the Bleed Source and Active track displays to check that the bleed present in the bleed source track is present and aligned with the bleed in your active track.
    Bleed source display:
    Active track display:

  • STRENGTH: Determines the amount of bleed reduction applied during processing. Higher Strength values may result in the removal of audio you wish to preserve. It is recommended you start with lower strength values and increase the values if needed to achieve the most desirable results.

  • ARTIFACT SMOOTHING: Helps to reduce or eliminate the “musical noise” that is often characteristic of FFT-based processing. Musical noise can be described as how something may sound underwater. Increase this slider if your output sounds watery, but decrease it when too much smoothing makes your audio sound dull.

What is an FFT?

  • Fast Fourier Transform: a procedure for the calculation of a signal frequency spectrum. The greater the FFT size, the greater the frequency resolution, i.e., notes and tonal events will be clearer at larger sizes. However, when using FFT-based processing, the more audio you remove from your source, the more likely you are to create undesirable artifacts.

Import: Supported File Formats

IMPORT: Audio File FormatsIMPORT: Video File Formats **
WAVAVI
BWFMPEG
AIFF/AIFWMV
MP3MPV
FLACM4V
AAX (Audible)
SD2
OGG
WMA
CAF

** Note about Importing Video File Formats

  • Importing any of the Video file formats listed above will import the Audio only, RX does not support video playback.
  • RX 6 Audio Editor requires having QuickTime installed to open QuickTime formats (like .MOV).

Tip: Option for opening Split Stereo files in one tab

Mono audio files with (.L and .R) or (.1 and .2) extensions can be opened as either mono files (2 mono tabs) or split stereo (1 stereo file tab). See Preferences > Misc for more information.

Export: Supported File Formats

EXPORT: Audio File Formats
WAV
BWF
AIFF
OGG
FLAC
MP3 [STD & ADV]

File Format Dependencies

Some file formats may have dependencies based on your operating system that may prevent you from importing them into the RX Audio Editor. For example, Windows native formats (like WMA and WMV) may not open on Mac and QuickTime formats (like AAC, MOV, and M4V) may require installing QuickTime on Windows and running RX 6 Audio Editor in 32 bit mode.

Knowledgebase Article about Supported Audio and Video Formats

For the most up-to-date information about supported audio and video formats, check out this knowledgebase article:
Supported Audio and Video Formats KB Article

Creating New Files

To create a new file in RX:
1. Open the File menu
2. Select “New…”
3. You will be prompted for the name, sample rate and channel count of the new file you are creating.

Tip: Create a new file from the contents of the clipboard

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If you have existing audio data in your clipboard (for example, if you have copied a selection from an existing file in RX), you can create a new file based on that audio data.

  • Open the “File” menu, choose “New from Clipboard” or use the keyboard shortcut: Command+Shift+N (Mac) or Ctrl+Shift+N (Windows)
    The new file will match the sample rate and channel count of the audio data present on your clipboard.

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Importing Files

There are four ways to import a file into the RX 6 Audio Editor:

  1. From the File menu, select Open… and select the files you want to open.
  2. Drag and drop a file from your operating system into the RX UI.
  3. Drag a file from Finder/Explorer to the RX icon in the Dock/Desktop.
  4. Double-click on the RX logo in the middle of the RX Audio Editor interface when no files are loaded in the application

Managing File Tabs

RX supports having up to 16 files open at once.

You can navigate between tabs by clicking on a tab or using the following keyboard shortcuts:

ActionMac Keyboard ShortcutWindows Keyboard Shortcut
Select File Tab to the right of the current selected tabControl+TabAlt+Tab
Select File Tab to the left of the current selected tabControl+Shift+TabAlt+Shift+Tab
  • If you right click on a file tab, you can access options for closing tabs.

  • If you have multiple files open, an arrow button will appear to the right of the last visible tab. You can access file tabs that are not currently visible by clicking on the arrow button and selecting a tab from the menu.

Saving Files

There are a number of ways to save a file in RX 6 Audio Editor. The Save Operations include:

NameDescriptionDefault Mac ShortcutDefault Windows Shortcut
SaveFor uncompressed file formats (.wav or .aiff): Overwrites the original file on diskCommand+SCtrl+S
For compressed file formats: Opens the Export File dialogCommand+SCtrl+S
Save As…For uncompressed file formats (.wav or .aiff): Save a copy of your file using the same file formatCommand+Shift+SCtrl+Shift+S
For compressed file formats: Opens the Export File dialogCommand+Shift+SCtrl+Shift+S
Save RX DocumentSaves file as .rxdoc file extension (more information below)
Save RX Document As…Saves copy of your .rxdoc file

Autosave

The RX Audio Editor will automatically save backups of your editing session by default. When the RX application is launched, it will open your most recent editing session. The option to turn it off is located under the Preferences > Misc tab as “Resume last editing session when app starts.”

Saving RX Documents

You can save a file using the RX Document file format (.rxdoc) to archive your edits. An RX Document includes your original file, all the edits you’ve made to it, and your most recent selection and view state. RX Documents can only be opened in the RX Audio Editor. If you need to save your file so it can be opened somewhere else (like a DAW or media player), you need to export it in another format (like WAV or AIFF).

To save an RX Document, select File > Save RX Document… and select where you would like to store the file.

Keep in mind that the size of the RX Document file can be very large, especially if your list of edits include multiple processes on the whole file.

Export Options

When exporting, you will be able to define the output file name, directory, and bit depth. There are four ways you can export a file in RX 6 Audio Editor:

  1. Export File
  2. Export Selection
  3. Export Regions to Files
  4. Export Screenshot
  5. Export History as XML

Export File

  1. Select File… > Export
  2. Select the file format you want to Export to and adjust the associated settings as desired (available settings explained in the table below)
  3. Click “OK”
  4. In the system window, name your file and choose where you would like to save it to
  5. Click “Save” to export your file

Tip

  • Checking the Reopen file in RX checkbox will open your exported file in the RX 6 Audio Editor after the export completes successfully

Export Format Options

RX 6 offers the folowing file type options for export:

  1. WAV
  2. AIFF
  3. FLAC
  4. OGG VORBIS
  5. MP3 [STD & ADV]

The following tables outline the export options for the different file formats.

Uncompressed Export File Formats

Uncompressed FormatBit DepthDitherBWFPreserve non-audio data
WAV16 bit, 24 bit, 32 bit (float), 32 bit (int)None, White Noise (TPDF), Noise shaping (MBIT+)Outputs a broadcast wave format fileExported file retains the metadata of the original file
AIFF16 bit, 24 bit, 32 bit (float), 32 bit (int)None, White Noise (TPDF), Noise shaping (MBIT+)n/aExported file retains the metadata of the original file

Compressed Export File Formats

LOSSLESS COMPRESSION

FormatBit DepthDitherCompression Level
FLAC8 bit, 16 bit, 24 bitNone, White Noise (TPDF), Noise shaping (MBIT+)Adjusts the compression strength of the FLAC encoder. Stronger compression requires more CPU time during file encoding but results in a slightly smaller file. FLAC compression setting does not result in any quality change to the signal since FLAC is a lossless format.

LOSSY COMPRESSION

FormatQualityModeBit Rate
OGGAdjusts the bitrate of the Vorbis compression algorithm. Higher bitrate values result in higher audio quality, but also increase the file sizen/an/a
MP3 [STD & ADV]n/aControls how (or if) bit rate varies over time. Constant bit rate (CBR), Average bit rate (ABR), Variable bit rate (VBR)Adjusts the bit rate of the MP3 compression algorithm. Higher bit rates result in higher quality audio but will increase the file size

Export Selection

This option will allow you to export only the audio that is contained within your current selection, as opposed to the entire audio file.

  1. Select File > Export Selection, and the Export File dialogue box appears.
  2. Follow the additional aforementioned steps.

Export Regions to Files

This option allows you to export multiple regions of any audio file that has regions as discrete audio files. To export regions:

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  1. Select File > Export Regions to Files.
  2. Choose the exported file format in the Export window
  3. In the File Save dialogue box, navigate to where you want to save the files.
  4. If you want, enter a prefix for your series of files in the Optional prefix field.

    Note

    • If you choose not to add a prefix, the names of the files will be the names of the regions. If any regions have the same name, numbers will be appended sequentially.

  5. Click Save.

Export Screenshot

This option allows you to export your current Spectrogram/Waveform display as a PNG image file. This can be very helpful for archiving any restoration process or for forensic documentation.

When clicking on Export Screenshot from the File menu, your current Spectrogram/Waveform view will be used for adjusting your screenshot size and position.

Note

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The Spectrogram/Waveform transparency balance must be set before selecting File > Export Screenshot as this cannot be changed in this window.

To define the size of your screenshot, simply click and drag in order to enlarge or shrink the screenshot window. The dimensions of your resulting screenshot will update automatically, however these can also be entered manually by clicking once in either Width or Height.

Note

The max resolution attainable for your screenshot will be limited by the individual computer’s screen resolution.

When you are finished changing the dimensions of your screenshot, click on the Save button to name and save your .PNG screenshot to your chosen directory.

Tip

To save screenshots faster (at the expense of having a larger file on disk), disable Maximum image compression.

Export History as XML

Export the Undo history list of your current file tab to an xml document

File Info

The File Info window can be opened by clicking Window > File Info and has two sections; General Info and More Info. The More Info section lists information dependent on the file type. The following table describes the information in each section including a list of possible entries in the More Info section:

General Info section

InformationDescription
NameThe current filename
DurationLength of the file
Sampling rateThe original sampling rate of the file
Bit depthThe original bit depth of the file
ChannelsMono or stereo
Size on diskSize of the file in bytes

More Info section

Information
Timecode
Created by
Originator reference
Date created
Time created
BWF version
Coding history
Track Title
Artist
Album
Date
Track Number
Comment
Genre

Closing files

There are two ways to close a file:

  1. Close: if you close a file that has uncommitted changes (represented by a dot or asterisk next to the file name in the tab display), RX will ask you if you want to save the file. RX does not ask about saving files when the application is closed because your changes are retained in its session data.
  2. Close All: if you have any uncommitted changes in open files, RX will prompt you to save for every unsaved file.

The default keyboard shortcuts for closing files are:

ActionMac Keyboard ShortcutWindows Keyboard Shortcut
Close the current file tabCommand+WCtrl+W
Closes all file tabsCommand+Shift+WCtrl+Shift+W
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