Diff: main.cpp

Revision:

0:540cf00460b2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Apr 29 19:54:31 2020 +0000
@@ -0,0 +1,105 @@
+#include "mbed.h"
+//Adafruit MEMs SPW2430 microphone demo
+
+BusOut myleds(LED1,LED2,LED3);
+Serial pc (USBTX, USBRX);
+bool countdown;
+
+float received_buffer_1[22050];
+float received_buffer_temp_1[22050];
+float goes_to_mfcc_1[22050];
+float received_buffer_2[22050];
+float received_buffer_temp_2[22050];
+float goes_to_mfcc_2[22050];
+float threshold;
+int counter;
+float energy;
+float energy_valued;
+float bias;
+float noise;
+float mic_valued;
+int mod;
+float mic;
+
+class microphone
+{
+    public :
+        microphone(PinName pin);
+        float read();
+        operator float ();
+    private :
+        AnalogIn _pin;
+};
+microphone::microphone (PinName pin):
+    _pin(pin)
+{
+}
+float microphone::read()
+{
+    return _pin.read();
+}
+inline microphone::operator float ()
+{
+    return _pin.read();
+}
+ 
+microphone mymicrophone(A0);
+
+int main(){
+    pc.baud(9600);
+    mod = 1;
+    energy = 0;
+    threshold = 0.03;//original is 0.03
+    bias = 0.67/3.3;
+    noise = 0.037;
+    while(true){
+        mic = (mymicrophone-bias);
+        for(int t = 22048; t >= 0;t--){
+            received_buffer_2[t+1]=received_buffer_2[t];        
+        }
+        received_buffer_2[0]=received_buffer_1[22049];
+        for(int j = 22048; j >= 0;j--){
+            received_buffer_1[j+1]=received_buffer_1[j];        
+        }
+        received_buffer_1[0] = mic;
+        mod++;
+        if((mod+400)%500 == 0 && mod >= 44100){
+            for(int k = 16640; k <= 17640;k++){
+                energy = energy + ((received_buffer_2[k]-noise)*(received_buffer_2[k]-noise));
+            }
+            if(energy >= threshold){
+                //do mfcc here
+                printf("\n\r");
+                printf("mod = %d, energy = %f , threshold = %f", (mod-44100), energy, threshold);
+                printf("\n\r");
+                printf("doing mfcc");
+                printf("\n\r");
+                //for(int u = 0; u < 22050;u++){
+                //    goes_to_mfcc_1[u]=received_buffer_1[u];        
+                //}
+                //for(int o = 0; o < 22050;o++){
+                //    goes_to_mfcc_2[o]=received_buffer_2[o];        
+                //}
+                energy = 0;
+            }
+            else{
+               energy = 0;
+            }
+        }
+        wait(1.0/22050.0);      
+    }
+    //printf("\n\r");
+    //printf("%f",energy);
+    //printf("\n\r");
+    //mic_mean = mic_mean / 44100.0f;
+    //printf("%f",mic_mean);
+    //printf("\n\r");
+
+
+    //for(int k = 22049; k >= 0;k--){
+    //    printf("%f",received_buffer_2[k]);      
+    //}
+    //for(int l = 22049; l >= 0;l--){
+    //    printf("%f",received_buffer_1[l]);          
+    //}
+}