This patch adds export format for header file that alsa-utils
uses. Automatic generation is much more convenient than hand
editing when there is update need.
The patch also contains some cleanup of unused code and small
code improvement. There are no changes to exported coefficients
values.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This patch adds the the Matlab script dmic_init() that simulates
initialization of the Intel PDM digital microphones decimation
block. The tool computes the needed FIR filters and exports
them as C header files. The script dmic_batch computes all the
currently used decimation settings.
The generated header files from subdirectory include need to be
manually copied to src/include/sof/audio/coefficients/pdm_decim/
and the header file pdm_decim_table.h edited manually if the
header file names were changed due to different filter characteristic
(band frequencies, stop-band attenuation).
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Seppo Ingalsuo