japa(1) jack or alsa perceptual analyser


japa {-h|-A|-J} [options]


Japa (JACK and ALSA Perceptual Analyser), is a 'perceptual' or 'psychoacoustic' audio spectrum analyser. Possible uses include spectrum monitoring while mixing or mastering, evaluation of ambient noise, and (using pink noise), equalisation of PA systems. For more information see /usr/share/doc/japa/README.gz.


One out of -A and -J must be given.
Show summary of options.
Use jack.
Select jack server.
Use alsa.
-C -P
Enable use of split ALSA devices.
-d <device>
If using alsa: Specify alsa device. Defaults to hw:0.0.
-r <rate>
If using alsa: Specify sample frequency. Defaults to 48000.
-p <period>
If using alsa: Specify period size. Defaults to 1024.
-n <nfrags>
If using alsa: Specify number of fragments. Defaults to 2.


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

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