This patch updates the SRC coefficients generator scripts with
add of parameter cfg.thdn that is the min. THD+N performance. The
target gain is set to 0 dB for all conversions to be generated.
in src_param.m the default stop-band is relaxed from 70 dB to 63 dB.
It can be done because the THD+N performance check will step up the
attenuation. The default lower attenuation saves RAM in easy
simple fractions conversions.
The main change is in src_generate.m. The conversions matrix is
two pass. In the first pass the converters are designed and the
converter for same fraction and other bandwidth parameters with
highest performance is preserved. In the second pass the table
of converters is constructed and the size of filters and buffers
and other information like MCPS estimate are collected.
Other changes include reduction of plots made during batch design
and remove of some commented out code.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
There's need to have a 0 dB gain SRC conversion matrix while
earlier all defaulted to -1 dB. With this change the parameter
cfg.gain can be used with src_generate() function.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This patch replaces all the filter coefficients to avoid the
unpleasant effect of samples saturation that the previous 0 dB max.
gain scaled coefficients could cause. The saturation of transients
may still happen but it should be more rare.
The filter coefficients scaling is changed from fixed pass band peak
align (to 0 dB) into DC gain controllable via new parameter gain in
src_param.m.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This patch adds 50 kHz into SRC generator script for std and tiny
profiles. The src generator script is cleaned up and the default
conversion matrix is moved into caller script for easier maintenance.
The plots appearance is improved and the generated coefficients code
look is improved to pass the git pre- and post-commit script
requirements.
The SRC test bench scripts are updated for changed locations. A SRC
playback topology is used for test bench and real device usage.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Seppo Ingalsuo