Added impulse noise for noiseblanker testing

diff --git a/hpsdrsim.c b/hpsdrsim.c
index d6b9a377d147f6e950615d6bfba6c14925453a3d..c41659e2df49d8dcad68a0886b3e21760fd5ffdd 100644 (file)
--- a/hpsdrsim.c
+++ b/hpsdrsim.c
@@ -229,6 +229,7 @@ int main(int argc, char *argv[])
        // seed value for random number generator
        seed = ((uintptr_t) &seed) & 0xffffff;
         diversity=0;
+        noiseblank=0;
         OLDDEVICE=DEVICE_ORION2;
         NEWDEVICE=NEW_DEVICE_ORION2;
 
@@ -246,6 +247,7 @@ int main(int argc, char *argv[])
             if (!strncmp(argv[i],"-audio",        6))  {do_audio=1;}
             if (!strncmp(argv[i],"-P1",           3))  {oldnew=1;}
             if (!strncmp(argv[i],"-P2",           3))  {oldnew=2;}
+            if (!strncmp(argv[i],"-nb",           3))  {noiseblank=1;}
         }
 
         switch (OLDDEVICE) {
@@ -282,7 +284,20 @@ int main(int argc, char *argv[])
          off += 0.016362461737446839783659600954581;
        }
 
-       if (diversity) {
+        //
+        // Use only one buffer, so diversity and
+        // noise blanker testing are mutually exclusive
+        // so diversity==0 means "no man-made noise",
+        //    diversity==1 && noiseblank == 0 means "noise for testing diversity"
+        //    diversity==1 && noiseblank == 1 means "noise for testing noise blanker"
+        //
+        if (noiseblank) diversity=1;
+
+       if (diversity && !noiseblank) {
+          //
+          // The diversity signal is a "comb" with a lot
+          // of equally spaces cosines
+          //
          fprintf(stderr,"DIVERSITY testing activated!\n");
          fprintf(stderr,".... producing some man-made noise\n");
           memset(divtab, 0, LENDIV*sizeof(double));
@@ -307,6 +322,18 @@ int main(int argc, char *argv[])
            divtab[i]=divtab[i]*off;
          }
        }
+
+        if (diversity && noiseblank) {
+           //
+           // Create impulse noise as a real-time signal
+           // 5 impulses per second
+           //
+           memset(divtab, 0, LENDIV*sizeof(double));
+           fprintf(stderr,"NOISE BLANKER test activated\n");
+           for (i=0; i<5; i++) {
+             for (j=9600*i; j< 9600*i+100; j++) divtab[j]=1.0;
+           }
+        }
        
 //
 //      clear TX fifo
@@ -1285,11 +1312,15 @@ void *handler_ep6(void *arg)
                    pointer += 8;
                    memset(pointer, 0, 504);
                    fac1=rxatt_dbl[0]*0.0002239;        // Amplitude of 800-Hz-signal to ADC1
-                   if (diversity) {
+                   if (diversity && !noiseblank) {
                        fac2=0.0001*rxatt_dbl[0];       // Amplitude of broad "man-made" noise to ADC1
                        fac4=0.0002*rxatt_dbl[1];       // Amplitude of broad "man-made" noise to ADC2
                                                        // (phase shifted 90 deg., 6 dB stronger)
                    }
+                    if (diversity && noiseblank) {
+                       fac2=0.001;
+                       fac4=0.0;
+                    }
                    for (j=0; j<n; j++) {
                        // ADC1: noise + weak tone on RX, feedback sig. on TX (except STEMlab)
                        if (ptt && (OLDDEVICE != DEVICE_C25)) {
@@ -1299,7 +1330,7 @@ void *handler_ep6(void *arg)
                          adc1isample= (txatt_dbl*i1*fac3+noiseItab[noiseIQpt]) * 8388607.0;
                          adc1qsample= (txatt_dbl*q1*fac3+noiseItab[noiseIQpt]) * 8388607.0;
                        } else if (diversity) {
-                         // man made noise only to I samples
+                         // man made noise to ADC1 samples
                          adc1isample= (noiseItab[noiseIQpt]+toneItab[toneIQpt]*fac1+divtab[divpt]*fac2) * 8388607.0;
                          adc1qsample= (noiseQtab[noiseIQpt]+toneQtab[toneIQpt]*fac1                   ) * 8388607.0;
                        } else {

diff --git a/hpsdrsim.h b/hpsdrsim.h
index 1c602ca23100f55b8a28174f4f80c1ce13d07878..991a6e9a7abf3bca2d2bdef2bd530d517df75f54 100644 (file)
--- a/hpsdrsim.h
+++ b/hpsdrsim.h
@@ -55,8 +55,9 @@ EXTERN double noiseQtab[LENNOISE];
 // using DIVERSITY
 //
 EXTERN int diversity;
+EXTERN int noiseblank;
 
-#define LENDIV 16000
+#define LENDIV 48000
 EXTERN double divtab[LENDIV];
 //
 // An 800-Hz tone with 0 dBm