Auphonic Leveler Batch Processor
The Auphonic Leveler is an intelligent Desktop Batch Audio File Processor
which analyzes your audio and corrects level differences between speakers,
between music and speech and between multiple audio files to achieve a
balanced overall loudness.
It includes a True Peak Limiter, targets for common
Loudness Standards (EBU R128, ATSC A/85, Podcasts, Mobile, etc.)
and automatic Noise and Hum Reduction algorithms.
The Auphonic Leveler is
available for Mac OS X 10.6+ (64bit) and
Windows 7+ (32bit or 64bit).
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The following algorithms are included in the Auphonic Leveler Batch Processor:
- Adaptive Leveler
-
Our Adaptive Leveler analyzes the content of audio files using machine learning techniques and is capable of balancing loudness variations between segments in one file:
- Music, background and speech segments are classified
- Loudness differences between speakers are corrected and dynamic range compression is applied
- Music segments are processed with care: the overall loudness will be comparable to speech, but the natural dynamics are not changed as in speech segments
- Background segments (noise, wind, breathing, silence etc.) won't be amplified
- Most suitable for programs, where dialogs/speech is the most prominent content: podcasts, radio, broadcast, lecture and conference recordings, film and videos, screencasts etc.
This algorithm was trained with over three years of audio files from our Web Service and keeps learning and adapting to new data every day.
For more details and audio examples see
Adaptive Leveler
.
- Loudness Normalization
-
Global Loudness Normalization calculates the loudness of your audio and
applies a constant gain to reach a defined target level, so that all
processed files have the same average loudness.
The loudness is calculated according to latest broadcast standards (ITU-R BS.1770)
and Auphonic supports loudness targets for television (EBU R128, ATSC A/85),
radio, podcasts, mobile and more.
For details and audio examples see
Global Loudness Normalization
.
- True Peak Limiter
-
A True Peak Limiter, with 4x oversampling to avoid intersample peaks,
is used to limit the final output signal to the selected maximum
true peak level and ensures compliance with the selected loudness target.
- Noise and Hum Reduction
-
Our Noise Reduction algorithms remove broadband background noise in audio files with slowly varying backgrounds.
First the audio file is segmented in regions with different background noise characteristics, then a noise print is extracted in each region
and removed from the audio signal.
In automatic mode, a classifier decides if and how much noise reduction
is necessary.
The Hum Reduction algorithms
identify power line hum and all its partials.
Afterwards the partials are removed as necessary with sharp filters.
For more details and audio examples see
Noise Reduction and
Hum Reduction.
- High Pass Filter
-
An adaptive High Pass Filter cuts unnecessary and disturbing low frequencies,
depending on the context (speech, music or noise).
For more details see
Adaptive Filtering
.
The Auphonic Leveler Batch Processor includes a
Parallel Task Queue with configurable CPU, RAM and disk usage.
Just drag and drop audio collections into the program window and
all files will be processed in parallel with your current settings.
During processing, the progress and status of all individual files and
the combined progress is shown in the application.
All your current settings (audio algorithm parameters,
output file options, intros/outros, warnings, hardware settings, etc.)
can be saved as Presets.
Audio Processing Statistics of input and output files
display details about what our algorithms are changing in your files.
They can be used to check compliance with
Loudness Standards
(Program Loudness, Maximum True Peak Level, LRA - see
EBU TECH 3341, Section 1
) and certain regulations for commercials (Max Momentary, Max Short-term Loudness - see Section 2.2).
It also shows how much our Adaptive Leveler changes your levels (Gain mean, min, max),
statistics about your input audio signals (SNR, Background and Signal Level) and much more.
Statistics can be exported as files (manually or automatically)
in machine readable JSON, in YAML, or in a human readable text format.
The exact file format is the same as in our
Web Service and is documented
here.
It is also possible to setup Warnings for quality control or as
alerts to manually check problematic segments in your audio:
for example, you don't want a MaxMomentary loudness >= -19 LUFS or
an Input SNR <= 15dB.
Warnings will be displayed in the application and are also exported
to processing statistics files.
We support a wide range of input and a limited selection of output file formats.
Sample rate and bit depth conversions are using the high quality
resampling and dithering algorithms of
SoX.
Please use lossless audio formats whenever possible.
- Supported Input File Formats:
-
WAV, WAV (float), AIFF, FLAC, MP3, Ogg Vorbis, Opus
Mac OS X only: MP4/M4A/M4B, AAC, ALAC, CAF, AC3, MP2, 3GP
- Supported Output File Formats:
-
WAV, WAV (float), AIFF, MP3 (via lame), FLAC, Ogg Vorbis, Opus
Mac OS X only: AAC (M4A)
Please see
Auphonic Leveler Help
for a descriptions of all available parameters and for further help.
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Screenshot 1
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Empty start screen of the Auphonic Leveler.
The Audio Algorithms Box (bottom left) shows basic controls to
enable/disable the Adaptive Leveler, High Pass Filter,
Noise and Hum Reduction
and to select a Target Loudness level.
Drag and drop files or folders to load multiple audio files.
-
Now multiple files are added to the Auphonic Leveler and we are ready to run.
Click on the Process All Files button (top right) to start all audio post productions.
-
During processing, a
progress bar is shown at the top right.
The left table lists the status and progress of all individual files.
Audio Processing Statistics of a selected file
are displayed in the right table: the format is exactly the same as
in our
web service and
is documented
here.
Statistics can be exported as files in JSON, YAML or in a human readable text format.
-
The Algorithm Details Preferences might be used by audio experts
to manually set the noise reduction amount, to adjust details of the
loudness measurement algorithms
and to select a custom maximum true peak level.
If you don't know what that means, please leave it at the default values!
-
Preference tab to select the Output Audio Format. All processed
files will be encoded into this format.
-
Details about the filenames and the location of Output Files.
It's also possible to automatically export processing statistics
(select box at the bottom).
-
Select an Intro and/or Outro file, which will be
added at the start/end of all your processed audio files.
-
Warnings can be used for quality control or as alerts to
manually check problematic segments. They will be
displayed in the Auphonic Leveler application and are also exported to processing statistics files.
-
Adjust RAM, CPU usage and the temporary processing directory of our audio processing task queue.
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We offer two licenses, depending on how you use the Auphonic Leveler Batch Processor.
If you want to buy a site license, have any questions or other licensing needs,
please contact us at licensing@auphonic.com.
All bug fixes and software updates up to the next major version can be downloaded and installed for free.
Please try and evaluate our program and algorithms fully before purchasing. All purchases are final!
All prices are listed in Euro (€) and US-Dollar ($), without taxes.
Sales tax or VAT may be charged, depending on where you live.
Companies from Europe can use their VAT ID (UID number)
to purchase without VAT.
To download and buy the Auphonic Leveler Batch Processor, you are required to
register for a free
Auphonic account.
The Auphonic Leveler includes our
Singletrack Audio Algorithms only,
they are exactly the same as implemented in our
Web Service.
Processing is done offline on your desktop computer: no need
to purchase Credits or to upload/download files.
Please see our Desktop Programs Help
for further remarks and distinctions!
Algorithm section in our
Online Production Form
with all algorithms included in the Auphonic Leveler Batch Processor.
IMPORTANT:
-
Advanced Algorithm Parameters,
Metadata (Tagging), Chaptermarks management,
Video Input/Output and
Automatic Content Deployment features of our
Web Service are not included in our desktop apps!
-
This program does not include our Multitrack Algorithms!
Please use Auphonic Multitrack
for multitrack productions.
Please evaluate our algorithms before purchasing the program:
In case of any problems or questions, please don't hesitate to contact us at
support@auphonic.com.
We also build custom versions of our programs and algorithms on request!