tested glottal phase in excitation for zero phase model but no difference

git-svn-id: https://svn.code.sf.net/p/freetel/code@58 01035d8c-6547-0410-b346-abe4f91aad63

diff --git a/codec2/octave/glottal.m b/codec2/octave/glottal.m
new file mode 100644 (file)
index 0000000..2b823c3
--- /dev/null
+++ b/codec2/octave/glottal.m
@@ -0,0 +1,25 @@
+% glottal.m
+% David Rowe 12 Sep 2009
+% Matlab script to generate the phase spectra of a glottal pulse
+
+% lpc10 pulse from spandsp.  When the file glottal.c was used as a part of the
+% excitation phase component in phase.c, phase_synth_zero_order(), no difference 
+% in speech quality was apparent.  So left out of code for now.
+
+sh=12
+kexc = [ 8,  -16,   26, -48,  86, -162, 294, -502, 718, -728, 184 672, -610, -672, 184, 728,  718, 502,  294, 162,   86,  48, 26, 16, 8];
+kexc = shift(kexc,sh);
+kexc = [kexc(1:sh) zeros(1,512-25) kexc(sh+1:25)];
+figure(1)
+plot(kexc)
+figure(2)
+G = fft(kexc);
+plot((1:256)*(4000/256),unwrap(angle(G(1:256))))
+
+f=fopen("glottal.c","wt");
+fprintf(f,"float glottal[]={\n");
+for m=1:255
+  fprintf(f,"  %f,\n",angle(G(m)));
+endfor
+fprintf(f,"  %f};\n",angle(G(256)));
+fclose(f);