comparison tests/TestPhaseVocoder.cpp @ 342:c6e2a313d153

A more difficult test

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
 
 #include "dsp/phasevocoder/PhaseVocoder.h"
 
 #include "base/Window.h"
+
+#include <iostream>
+
+using std::cerr;
+using std::endl;
 
 #define BOOST_TEST_DYN_LINK
 #define BOOST_TEST_MAIN
 
 #include <boost/test/unit_test.hpp>
 
 BOOST_AUTO_TEST_SUITE(TestFFT)
 
 #define COMPARE_CONST(a, n) \
     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
-        BOOST_CHECK_SMALL(a[cmp_i] - n, 1e-14);				\
+        BOOST_CHECK_SMALL(a[cmp_i] - n, 1e-7);				\
     }
 
 #define COMPARE_ARRAY(a, b)						\
     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
-        BOOST_CHECK_SMALL(a[cmp_i] - b[cmp_i], 1e-14);			\
+        BOOST_CHECK_SMALL(a[cmp_i] - b[cmp_i], 1e-7);			\
     }
 
 #define COMPARE_ARRAY_EXACT(a, b)						\
     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
         BOOST_CHECK_EQUAL(a[cmp_i], b[cmp_i]);			\

     COMPARE_ARRAY_EXACT(mag, magExpected1);
 
     double phaseExpected1[] = { 999, 0, 0, 0, 0, 0, 999 };
     COMPARE_ARRAY(phase, phaseExpected1);
 
-    // Derivation of values:
+    // Derivation of unwrapped values:
     // 
     // * Bin 0 (DC) always has phase 0 and expected phase 0
     //
     // * Bin 1 has expected phase pi (the hop size is half a cycle at
     //   its frequency), but measured phase 0 (because there is no

 
     double unwExpected2[] = { 999, 0, 4*M_PI, 4*M_PI, 8*M_PI, 8*M_PI, 999 };
     COMPARE_ARRAY(unw, unwExpected2);
 }
 
-//!!! signal that starts mid-phase
+BOOST_AUTO_TEST_CASE(overlapping)
+{
+    // Sine (i.e. cosine starting at phase -pi/2) starting with the
+    // first sample, introducing a cosine of half the frequency
+    // starting at the fourth sample, i.e. the second hop. The cosine
+    // is introduced "by magic", i.e. it doesn't appear in the second
+    // half of the first frame (it would have quite strange effects on
+    // the first frame if it did).
 
+    double data[32] = { // 3 x 8-sample frames which we pretend are overlapping
+	0, 1, 0, -1, 0, 1, 0, -1,
+	1, 1.70710678, 0, -1.70710678, -1, 0.29289322, 0, -0.29289322,
+	-1, 0.29289322, 0, -0.29289322, 1, 1.70710678, 0, -1.70710678,
+    };
+
+    PhaseVocoder pvoc(8, 4);
+
+    // Make these arrays one element too long at each end, so as to
+    // test for overruns. For frame size 8, we expect 8/2+1 = 5
+    // mag/phase pairs.
+    double mag[]   = { 999, 999, 999, 999, 999, 999, 999 };
+    double phase[] = { 999, 999, 999, 999, 999, 999, 999 };
+    double unw[]   = { 999, 999, 999, 999, 999, 999, 999 };
+
+cerr << "process 0" << endl;
+
+    pvoc.process(data, mag + 1, phase + 1, unw + 1);
+
+    double magExpected0[] = { 999, 0, 0, 4, 0, 0, 999 };
+    COMPARE_ARRAY(mag, magExpected0);
+
+    double phaseExpected0[] = { 999, 0, 0, -M_PI/2 , 0, 0, 999 };
+    COMPARE_ARRAY(phase, phaseExpected0);
+
+    double unwExpected0[] = { 999, 0, 0, -M_PI/2, 0, 0, 999 };
+    COMPARE_ARRAY(unw, unwExpected0);
+
+cerr << "process 1" << endl;
+
+    pvoc.process(data + 8, mag + 1, phase + 1, unw + 1);
+
+    double magExpected1[] = { 999, 0, 4, 4, 0, 0, 999 };
+    COMPARE_ARRAY(mag, magExpected1);
+
+    //!!! I don't know why [2] here is -M_PI and not M_PI; and I definitely don't know why [4] here is M_PI. Check these with care
+    double phaseExpected1[] = { 999, 0, -M_PI, -M_PI/2, M_PI, 0, 999 };
+    COMPARE_ARRAY(phase, phaseExpected1);
+
+    double unwExpected1[] = { 999, 0, M_PI, 3*M_PI/2, 3*M_PI, 4*M_PI, 999 };
+    COMPARE_ARRAY(unw, unwExpected1);
+
+cerr << "process 2" << endl;
+
+    pvoc.process(data + 16, mag + 1, phase + 1, unw + 1);
+
+    double magExpected2[] = { 999, 0, 4, 4, 0, 0, 999 };
+    COMPARE_ARRAY(mag, magExpected2);
+
+    double phaseExpected2[] = { 999, 0, 0, -M_PI/2, 0, 0, 999 };
+    COMPARE_ARRAY(phase, phaseExpected2);
+
+    double unwExpected2[] = { 999, 0, 2*M_PI, 7*M_PI/2, 6*M_PI, 8*M_PI, 999 };
+    COMPARE_ARRAY(unw, unwExpected2);
+}
 
 BOOST_AUTO_TEST_SUITE_END()