The toolbox to use LPC method can extract accurate formant frequency, and the resolution of formant filter order testing of all the speaker are the same problems. The toolbox by the United States a professor at Carnegie Mellon University to prepare, so all the explanations are the original English edition.

lpctoolbox_v20
..............\lpctools
..............\........\contents.m
..............\........\lpctool.m
..............\........\meanrc.m
..............\........\private
..............\........\.......\act_apdlg.m
..............\........\.......\analyzesnd.m
..............\........\.......\changes.txt
..............\........\.......\fixfilename.m
..............\........\.......\frame.m
..............\........\.......\frwrite.m
..............\........\.......\getpeaks.m
..............\........\.......\getsound.m
..............\........\.......\getstatusstr.m
..............\........\.......\helptext.txt
..............\........\.......\loadfilelist.m
..............\........\.......\loadsound.m
..............\........\.......\make_apdlg.m
..............\........\.......\menuactions.m
..............\........\.......\parcor.m
..............\........\.......\pksfig_click.m
..............\........\.......\pksfig_draw.m
..............\........\.......\pksfig_key.m
..............\........\.......\pksfig_setup.m
..............\........\.......\preham.m
..............\........\.......\rawread.m
..............\........\.......\rcfig_click.m
..............\........\.......\rcfig_draw.m
..............\........\.......\rcfig_setup.m
..............\........\.......\rootsolve.m
..............\........\.......\specgrm.m
..............\........\.......\uiconfig.m
..............\........\.......\uttdetect.m
..............\........\readdat.m
..............\........\readme.txt
..............\........\setparams.m
..............\The LPC Toolbox.doc

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