Added radioModulatedGenerator_F32 for AM/PM/FM transmit

examples/AM_PM_FM/AM_PM_FM.ino

@@ -0,0 +1,64 @@
+/* AM_PM_FM.ino     Bob Larkin 20 April 2021
+ * 
+ * This tests the radioModulatedGenerator class in AM and
+ * FM for the simple case of sine wave modulation.  The "carrier
+ * is 15000 Hz and a single output is produced.  This is only
+ * a partial test of the class as it supports phase modulation and
+ * formats such as QAM.
+* 
+* Public Domain
+ */
+
+#include "AudioStream_F32.h"
+#include "OpenAudio_ArduinoLibrary.h"
+#include "Arduino.h"
+#include "Audio.h"
+
+// *****************    CONTROLS   **********************
+// Comment out one of the next two:
+#define DO_AM
+//#define DO_FM
+
+// *******************************************************
+
+// Use SineCosine as it allows amplitudes greater than 
+// 1.0 (this is FP and that is OK). Use 0 channnel only.
+AudioSynthSineCosine_F32        sine1;
+//AudioSynthWaveformSine_F32    sine1;  // Restricts amplitude
+radioModulatedGenerator_F32   modGen1;
+AudioOutputI2S_F32            i2sOut1;
+
+#ifdef DO_AM
+AudioConnection_F32    pcord0(sine1,   0, modGen1, 0);
+#endif
+#ifdef DO_FM
+AudioConnection_F32    pcord0(sine1,   0, modGen1, 1);
+#endif
+
+AudioConnection_F32    pcord1(modGen1, 0, i2sOut1, 0);
+AudioControlSGTL5000   codec1;
+
+void setup(void) {
+  AudioMemory_F32(25);
+  Serial.begin(300);  delay(1000);
+  Serial.println("*** Test Modulated Generator ***"); delay(2000);
+  codec1.enable();  // MUST be before inputSelect()
+  codec1.inputSelect(AUDIO_INPUT_LINEIN);
+
+  sine1.frequency(567.0f);       // Modulation frequency
+  modGen1.frequency(15000.0f);   // Carrier frequency
+#ifdef DO_AM
+  sine1.amplitude(1.0f);    // 100% AM modulation
+  modGen1.amplitude(0.25);  // Total including AM peaks less than +/-1.0
+  modGen1.doModulation_AM_PM_FM(true, false, false, false);  //AM, single output
+#endif
+
+#ifdef DO_FM
+  sine1.amplitude(3000.0f); // 3 kHz deviation
+  modGen1.amplitude(1.0);  // Max DAC level
+  modGen1.doModulation_AM_PM_FM(false, false, true, false);  //FM, single output
+#endif
+}
+
+void loop(void) {
+}