tetrafile(1) Tetrahedral Microphone Processor


tetrafile <options> <config file> <input file(s)> <output file>


is a microphone processor, which converts the A-format signals from a tetrahedral Ambisonic microphone into B-format signals ready for recording. TetraProc consists of two parts: the A/B converter and the metering and monitoring. Tetrafile only has the A/B conversion part which is otherwise identical.

When using tetrafile, make sure to include the high pass filter option with a reasonable cutoff frequency - without it some mics (in particular Core Sound's) are very sensitive to LF noise.

The default output file type for Tetrafile is '.amb', which is a WAVEX file with a special GUID identifying it as Ambisonic. Not all tools can read this, use either .caf or .wav in those cases. Note that the file type is set using the command line options and does not depend on the filename extension.


The default options are --fuma, --amb.
Display this text.
Stereo input files.
--hpf <frequency>
Highpass filter.
--fuma, --sn3d, --n3d
B format standard.
--invx, --invy, --invz
B format inversion.
Endfire mode.
--amb, --caf, --wav
Output file type.


tetrafile was written by Fons Adriaensen <[email protected]>.

This manual page was written by Alessio Treglia <[email protected]> for the Debian project (but may be used by others).