Further formant experiments

2022-06-06 12:08:52 +01:00
parent c33582a8c4
commit baab6ae66e
2 changed files with 43 additions and 13 deletions
--- a/src/finer/R3StretcherImpl.h
+++ b/src/finer/R3StretcherImpl.h
@@ -223,15 +223,26 @@ protected:

    struct FormantData {
        bool enabled;
+        int fftSize;
        FixedVector<double> cepstra;
        FixedVector<double> envelope;
        FixedVector<double> shifted;

        FormantData(int _fftSize) :
            enabled(false),
+            fftSize(_fftSize),
            cepstra(_fftSize, 0.0),
            envelope(_fftSize, 0.0),
            shifted(_fftSize, 0.0) { }
+
+        double envelopeAt(double bin) const {
+            int b0 = int(floor(bin)), b1 = int(ceil(bin));
+            if (b1 == b0) return envelope.at(b0);
+            else {
+                double diff = bin - double(b0);
+                return envelope.at(b0) * (1.0 - diff) + envelope.at(b1) * diff;
+            }
+        }
    };
    
    Parameters m_parameters;