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