Diff: signal_processing.cpp

Revision:

7:88543caf2b6e

Parent:

6:291e341f0d71

Child:

8:e66f32a7e3e7

--- a/signal_processing.cpp	Fri Mar 06 19:02:55 2020 +0000
+++ b/signal_processing.cpp	Fri Mar 06 19:09:04 2020 +0000
@@ -36,7 +36,7 @@
 #define PADDED_FILTER_LENGTH            (WIN_NUM_TAPS + 2*(AUDIO_BLOCK_SAMPLES - 1))
 
 /* For Lab Exercise */
-#define Lab_Execution_Type              6
+#define Lab_Execution_Type              3
 
 float32_t padded_filter[PADDED_FILTER_LENGTH];
 
@@ -171,10 +171,11 @@
     for(uint16_t shift = 0; shift < CONV_LENGTH; shift++)
     {
         result = 0;
+
         //multiply-add the shifted, reversed data sample to the padded filter
         for(int i=0; i<sig_length; i++)
         {
-            result += padded_filter[i + shift] * d_in[i];
+            result += padded_filter[i + shift] * d_in[sig_length - i - 1];
         }
         
         // overlap-add to the buffer
@@ -386,7 +387,7 @@
         }
         else
         {
-         padded_filter[i] = win_filter_coeffs[WIN_NUM_TAPS - 1 - (i - AUDIO_BLOCK_SAMPLES - 1)];   
+         padded_filter[i] = win_filter_coeffs[i - AUDIO_BLOCK_SAMPLES - 1];   
         }
     }
     
@@ -416,29 +417,4 @@
     return;
 }
 
-void filter_fft_OS_init()
-{
-    for(int i=0; i < FFT_LENGTH; i++)
-    {
-        if(i < AUDIO_BLOCK_SAMPLES)
-        {
-            fft_of_filter[2*i] = 0;   
-            fft_of_filter[2*i+1] = 0;
-        }
-        else if(i < WIN_NUM_TAPS + AUDIO_BLOCK_SAMPLES)
-        {
-            fft_of_filter[2*i] = win_filter_coeffs[i];
-            fft_of_filter[2*i+1] = 0;
-        }
-        else
-        {
-            fft_of_filter[2*i] = 0;   
-            fft_of_filter[2*i+1] = 0;
-        }
-    }
-    
-    arm_cfft_f32(&arm_cfft_sR_f32_len1024, fft_of_filter, 0, 1);
-    
-    return;
-}