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