test ssb

lib/hilbert.c

@@ -0,0 +1,24 @@
+#include "hilbert.h"
+
+void init_hilbert(HilbertTransformer *hilbert) {
+    hilbert->delay = calloc(D_SIZE, sizeof(float));
+    hilbert->dptr = 0;
+}
+
+void apply_hilbert(HilbertTransformer *hilbert, float sample, float *output_0deg, float *output_90deg) {
+    float hilb;
+
+    hilbert->delay[hilbert->dptr] = sample;
+    hilb = 0.0f;
+    for(int i = 0; i < NZEROS/2; i++) {
+        hilb += (xcoeffs[i] * hilbert->delay[(hilbert->dptr - i*2) & (D_SIZE - 1)]);
+    }
+
+    *output_0deg = hilbert->delay[(hilbert->dptr - 99) & (D_SIZE - 1)];
+    *output_90deg = hilb;
+    hilbert->dptr = (hilbert->dptr + 1) & (D_SIZE - 1);
+}
+
+void exit_hilbert(HilbertTransformer *hilbert) {
+    free(hilbert->delay);
+}