diff --git a/src/dump_data.c b/src/dump_data.c
index 2eff7d4..5ec671f 100644
--- a/src/dump_data.c
+++ b/src/dump_data.c
@@ -305,9 +305,9 @@ int main(int argc, char **argv) {
     compute_frame_features(st, X, P, Ex, Ep, Exp, features, x);
     fwrite(features, sizeof(float), NB_FEATURES, ffeat);
     /* PCM is delayed by 1/2 frame to make the features centered on the frames. */
-    for (i=0;i<FRAME_SIZE/2;i++) pcm[i+FRAME_SIZE/2] = float2short(x[i]);
+    for (i=0;i<FRAME_SIZE-TRAINING_OFFSET;i++) pcm[i+TRAINING_OFFSET] = float2short(x[i]);
     if (fpcm) fwrite(pcm, sizeof(short), FRAME_SIZE, fpcm);
-    for (i=0;i<FRAME_SIZE/2;i++) pcm[i] = float2short(x[i+FRAME_SIZE/2]);
+    for (i=0;i<TRAINING_OFFSET;i++) pcm[i] = float2short(x[i+FRAME_SIZE-TRAINING_OFFSET]);
     old_speech_gain = speech_gain;
     count++;
   }
diff --git a/src/freq.h b/src/freq.h
index 33afd55..0316edd 100644
--- a/src/freq.h
+++ b/src/freq.h
@@ -30,10 +30,13 @@
 
 #define FRAME_SIZE_5MS (2)
 #define OVERLAP_SIZE_5MS (2)
+#define TRAINING_OFFSET_5MS (1)
+
 #define WINDOW_SIZE_5MS (FRAME_SIZE_5MS + OVERLAP_SIZE_5MS)
 
 #define FRAME_SIZE (80*FRAME_SIZE_5MS)
 #define OVERLAP_SIZE (80*OVERLAP_SIZE_5MS)
+#define TRAINING_OFFSET (80*TRAINING_OFFSET_5MS)
 #define WINDOW_SIZE (FRAME_SIZE + OVERLAP_SIZE)
 #define FREQ_SIZE (WINDOW_SIZE/2 + 1)