removed some old code,

rename a function, that tries to add IIRfilter Butterworth on a signal.  Lets see if I can get it to work on Graphbuffer data one of these days.

diff --git a/client/ui.c b/client/ui.c
index 48a55b1fdfea12e5d9d9c26cc737d9e50b3049cb..9c24f17d1bdd2aa5155397dc54fb9fafcff646fc 100644 (file)
--- a/client/ui.c
+++ b/client/ui.c
@@ -80,13 +80,13 @@ void SetLogFilename(char *fn) {
   logfilename = fn;
 }
  
-void iceFsk3(int * data, const size_t len){
+void iceIIR_Butterworth(int *data, const size_t len){
 
        int i,j;
        
        int * output =  (int* ) malloc(sizeof(int) * len);      
        memset(output, 0x00, len);
-       float fc           = 0.1125f;          // center frequency
+       float fc = 0.1125f;          // center frequency
        size_t adjustedLen = len;
        
     // create very simple low-pass filter to remove images (2nd-order Butterworth)
@@ -94,13 +94,13 @@ void iceFsk3(int * data, const size_t len){
     float b[3] = {0.003621681514929,  0.007243363029857, 0.003621681514929};
     float a[3] = {1.000000000000000, -1.822694925196308, 0.837181651256023};
     
-    float sample           = 0;      // input sample read from file
+    float sample           = 0;      // input sample read from array
     float complex x_prime  = 1.0f;   // save sample for estimating frequency
     float complex x;
                
        for (i=0; i<adjustedLen; ++i) {
 
-               sample = data[i]+128;
+               sample = data[i];
                
         // remove DC offset and mix to complex baseband
         x = (sample - 127.5f) * cexpf( _Complex_I * 2 * M_PI * fc * i );
@@ -125,63 +125,6 @@ void iceFsk3(int * data, const size_t len){
        for (j=0; j<adjustedLen; ++j)
                data[j] = output[j];
                
-       CmdLtrim("30");
-       adjustedLen -= 30;
-       
-       // zero crossings.
-       for (j=0; j<adjustedLen; ++j){
-               if ( data[j] == 10) break;
-       }
-       int startOne =j;
-       
-       for (;j<adjustedLen; ++j){
-               if ( data[j] == -10 ) break;
-       }
-       int stopOne = j-1;
-       
-       int fieldlen = stopOne-startOne;
-       
-       fieldlen = (fieldlen == 39 || fieldlen == 41)? 40 : fieldlen;
-       fieldlen = (fieldlen == 59 || fieldlen == 51)? 50 : fieldlen;
-       if ( fieldlen != 40 && fieldlen != 50){
-               printf("Detected field Length: %d \n", fieldlen);
-               printf("Can only handle 40 or 50.  Aborting...\n");
-               free(output);
-               return;
-       }
-       
-       // FSK sequence start == 000111
-       int startPos = 0;
-       for (i =0; i<adjustedLen; ++i){
-               int dec = 0;
-               for ( j = 0; j < 6*fieldlen; ++j){
-                       dec += data[i + j];
-               }
-               if (dec == 0) {
-                       startPos = i;
-                       break;
-               }
-       }
-       
-       printf("000111 position: %d \n", startPos);
-
-       startPos += 6*fieldlen+5;
-       
-       int bit =0;
-       printf("BINARY\n");
-       printf("R/40 :  ");
-       for (i =startPos ; i < adjustedLen; i += 40){
-               bit = data[i]>0 ? 1:0;
-               printf("%d", bit );
-       }
-       printf("\n");   
-       
-       printf("R/50 :  ");
-       for (i =startPos ; i < adjustedLen; i += 50){
-               bit = data[i]>0 ? 1:0;
-               printf("%d", bit );     }
-       printf("\n");   
-       
        free(output);
 }
 

diff --git a/client/ui.h b/client/ui.h
index f2e949cdb60bafe2671fe7e990c7a594acc95cd3..b5133ab424ada438e24f74bf16501f5331f4c2c5 100644 (file)
--- a/client/ui.h
+++ b/client/ui.h
@@ -40,5 +40,5 @@ extern int PlotGridX, PlotGridY, PlotGridXdefault, PlotGridYdefault;
 extern int offline;
 extern int flushAfterWrite;   //buzzy
 
-void iceFsk3(int * data, const size_t len);
+void iceIIR_Butterworth(int * data, const size_t len);
 #endif