mirror of https://github.com/thesofproject/sof.git
b1c996b21b
In test topologies the MFCC data can be packed to 1, 2, or 4 channels stream. This change fixes the shown time scale for audio features 3D plot. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com> |
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|---|---|---|
| .. | ||
| README.txt | ||
| decode_ceps.m | ||
| run_mfcc.sh | ||
| setup_mfcc.m | ||
README.txt
This directory contains a tool to create configuration blob for SOF
MFCC component. It's simply run in Matlab or Octave with command
"setup_mfcc". The MFCC configuration parameters can be edited from the
script.
The configuration can be test run with testbench. First the test topologies
need to be created with "scripts/build-tools.sh -t". Next the testbench
is build with "scripts/rebuild-testbench.sh".
Once the previous steps are done, a sample wav file can be processed
into stream of cepstral coefficients with script run_mfcc.sh. E.g.
next command processes an ALSA test file with speech clip "front center".
The output file is hard-coded to mfcc.raw.
./run_mfcc.sh /usr/share/sounds/alsa/Front_Center.wav
The output can be plotted and retrieved with Matlab or Octave command:
[ceps, t, n] = decode_ceps('mfcc.raw', 13);
In the above it's known from configuration script that MFCC was set up to
output 13 cepstral coefficients from each FFT -> Mel -> DCT -> Cepstral
coefficients computation run.
Other kind of signals have quite big visual difference in audio features. Try
e.g. other sound files found in computer.
./run_mfcc.sh /usr/share/sounds/gnome/default/alerts/bark.ogg
./run_mfcc.sh /usr/share/sounds/gnome/default/alerts/sonar.ogg