r8brain PRO is a professional sample rate converter designed to deliver an
unprecedented sample rate conversion (SRC) quality. Unlike many existing SRC
algorithms available on the market, r8brain PRO implements sample rate
conversion processing in its full: interpolation and decimation steps without
exploiting any kind of simplifications; the signal is first resampled to a least
common multiple sample rate which makes conversion perfect. In the core of the
SRC algorithm, we use the convolution methods of our Pristine Space convolution
processor which is known for its highly precise convolution processing.
This gives us high sample rate conversion quality in combination with
comparably small processing times: sample rate conversion without
Like many existing SRC programs, r8brain PRO offers you a linear-phase
conversion mode. But more importantly, you also have an option of using
the minimum-phase conversion mode, which finally brings SRC with true analog
qualities to affordable digital audio workstations: in this mode, r8brain
PRO works like an ideal digital-to-analog converter followed by an
analog-to-digital converter to resample the audio. This eliminates pre-ringing
associated with linear-phase designs, while introducing only a minimal amount
of phase coloration.
r8brain PRO can read mono, stereo and multi-channel files in both WAV and
AIFF file formats, creating 16-, 24- and 32-bit mono, stereo and multi-channel
WAV files in fixed and floating point formats. EBU BWF (broadcasting)
extensions, extensible wave format, sample loops and textual data residing
inside the file are also supported. For the sake of convenience, r8brain
PRO allows you to perform batch conversions in a convenient manner.
r8brain PRO's bit-depth conversion is limited to flat dithering. We have
decided not to implement noise-shaping dithering because pro audio production
software available on the market usually offers the user noise-shaping dithering
of some kind already. We also based our decision on the fact that the sample rate
conversion process often adjusts peak structure of the original program
material, thus, in many cases, making a subsequent peak-limiting a necessity.
To prevent output audio from clipping we have implemented a level normalization
The demo version of r8brain PRO allows you to evaluate all features of the
software, but its conversion is limited to the first minute of an audio file.
The demo version does not support batch conversions. You may register to obtain
either a Full or Light license of r8brain PRO. The Light version offers you
a linear-phase conversion mode and up to 48 kHz output sample rates only while
supporting all input sample rates. The Full version offers you all features of
r8brain PRO features:
Reads 8-, 16-, 24-, 32-bit PCM and IEEE files
Reads both WAV and AIFF files
Writes 16-, 24-, 32-bit PCM and IEEE WAV files
Multi-channel file support
Extensible wave format support
EBU BWF extensions support
Linear- and minimum-phase modes
Ultra-steep conversion mode
Supports all standard sample rates
File folder. This is the name of the folder containing the original
WAV or AIFF files. To select a folder, just select any file in it.
In parallel, the program will put the selected file into the file list which you
can immediately process without first pressing the "Scan folders" button.
However, if you have selected file folder with the "Browse folders" function
you should use the "Scan folders" option as well.
Files to process list box lists all the files which shall be
processed when you press the "Process" button. You can use the Del key to
remove list entries. Several files can be selected for deletion. The Enter
key (or mouse double click) can be used to open the currently selected
Scan folders button scans the specified folder for WAV and AIFF
files and adds them into the file list. Before scanning starts, the file list
is cleared. You can also use the "Clear list" button to clear the file
Output folder specifies the folder where output files should be
created. This field is filled automatically after each new input file
folder is selected. Please note that if you have enabled the "Include
subfolders" option files in these subfolders will all be exported to
the Output folder preserving the folder structure.
Add suffix to the converted file switch allows you to append any
specified suffix to the output filename. This allows you to easily identify
resampled copies of your files. Please note that disabling this option
may overwrite the original file. Disable this option with care!
Out sample rate selects which samplerate resulting files should
Out bitdepth selects which bit-depth resulting files should
Filter specifies filter type to use during sample rate
Ignore already processed files switch enables skipping of
already processed files. Such files are identified by r8brain PRO via special
marker which is created for each output file which passes processing
Prevent clipping switch enables automatic normalization
for files with detected clipping. Normalizing is engaged only if the clipping
occurs in the resulting file. It is a counter-measure against clipping.
Normalize peak dBFS option can be used to normalize the resulting
file to the specified dB (full scale) peak value. Peak value should be
specified in decibells, with decimal part separated with the point
Ultra-steep mode option enables mode which offers an increased
output bandwidth. In this "ultra-steep" mode only the most high frequencies
get filtered out (about 1.4% of the total linear bandwidth, in non-ultra mode
it nears 6.25%, which is still acceptable). This means that
during conversion there will be almost no loss of high-frequency information.
However, in this mode conversion takes roughly 3 times more time.
About button brings program's version and registration
Process button starts processing of the files listed in the file
list. Any file that could not be processed will be listed again after the
batch finishes. This allows you to check/edit any such file in the default
audio file editor and continue the batch processing later.
r8brain PRO does not have such function. It can only read BWF data
and copy it into the destination WAV file and update its 'Time offset'
field (it is updated according to the input/output sample rate ratio).