Add root_pol

[takenori-y]

No description provided.

[codecov]

Codecov Report

Merging #17 (04a4862) into master (72fcde4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   99.74%   99.75%           
=======================================
  Files         134      136    +2     
  Lines        3136     3210   +74     
=======================================
+ Hits         3128     3202   +74     
  Misses          8        8           

Flag	Coverage Δ
unittests	99.75% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
diffsptk/core/__init__.py	100.00% <100.00%> (ø)
diffsptk/core/b2mc.py	100.00% <100.00%> (ø)
diffsptk/core/c2ndps.py	100.00% <100.00%> (ø)
diffsptk/core/cqt.py	100.00% <100.00%> (ø)
diffsptk/core/dct.py	100.00% <100.00%> (ø)
diffsptk/core/delta.py	100.00% <100.00%> (ø)
diffsptk/core/dfs.py	100.00% <100.00%> (ø)
diffsptk/core/excite.py	95.45% <100.00%> (-0.11%)	⬇️
diffsptk/core/fbank.py	100.00% <100.00%> (ø)
diffsptk/core/freqt.py	100.00% <100.00%> (ø)
... and 23 more

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