diff --git a/radio/interpolation/PolyPhase.hpp b/radio/interpolation/PolyPhase.hpp
index 8b4022e..00314b0 100644
--- a/radio/interpolation/PolyPhase.hpp
+++ b/radio/interpolation/PolyPhase.hpp
@@ -86,10 +86,13 @@ public:
 			// Polyphase filtering
 			uint32_t index = (uint32_t)dmod(dmax(0, mu*m_M), (RealScalar)m_M);
 			ComplexScalar yout = m_fir.processReal(column(m_coeff, index));
-			buf_out->write(&yout, 1);
 
 			// Process timing generator
-			m_timingGenerator.process(yout);
+			bool is_sample = m_timingGenerator.process(yout);
+			if (is_sample)
+			{
+				buf_out->write(&yout, 1);
+			}
 		}
 	}