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OpenAudio_ArduinoLibrary/examples/CESSB_ZeroIF/CESSB_ZeroIF.ino

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// CESSB_ZeroIF.ino
// This tests the Controlled Envelope Single Sideband generator version
// that produces a zero-IF signal 0to 3kHz or 0 to -3 kHz.
// Uses radioCESSB_Z_transmit_F32.h and .cpp. See the .h file for
// more information and references.
// Tests with voice from SD Card file and a 1 second 750 Hz tone burst.
//
// The SD card may connect to different pins, depending on the
// hardware you are using. Configure the SD card
// pins to match your hardware. It is set for T4.x Rev D PJRC
// Teensy Audio Adaptor card here.
//
// Your microSD card must have the WAV file loaded to it:
// W9GR48.WAV
// These are at
// https://github.com/chipaudette/OpenAudio_ArduinoLibrary/blob/master/utility/
//
// This example code is in the public domain.
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include "OpenAudio_ArduinoLibrary.h"
// T3.x supported sample rates: 2000, 8000, 11025, 16000, 22050, 24000, 32000, 44100, 44117, 48000,
// 88200, 88235 (44117*2), 95680, 96000, 176400, 176470, 192000
// T4.x supports any sample rate the codec will handle.
const float sample_rate_Hz = 48000.0f;
const int audio_block_samples = 128; // Always 128
AudioSettings_F32 audio_settings(sample_rate_Hz, audio_block_samples);
AudioSynthWaveformSine_F32 sine1(audio_settings);
AudioSDPlayer_F32 playWav1(audio_settings);
AudioMixer4_F32 mixer4_0;
radioCESSB_Z_transmit_F32 cessb1(audio_settings);
RadioIQMixer_F32 iqMixer1(audio_settings);
AudioMixer4_F32 mixer4_2;
AudioFilter90Deg_F32 filter90deg1(audio_settings);
RadioIQMixer_F32 iqMixer2(audio_settings);
AudioMixer4_F32 mixer4_1;
AudioOutputI2S_F32 audioOutput(audio_settings);
AudioAnalyzeFFT1024_F32 fft1;
AudioConnection_F32 patchCord0(playWav1, 0, mixer4_0, 0);
AudioConnection_F32 patchCordb(sine1, 0, mixer4_0, 1);
AudioConnection_F32 patchCordc(mixer4_0, 0, cessb1, 0);
AudioConnection_F32 patchCord1(cessb1, 0, iqMixer1, 0);
AudioConnection_F32 patchCord2(cessb1, 1, iqMixer1, 1);
AudioConnection_F32 patchCord9(iqMixer1, 0, mixer4_2, 0);
AudioConnection_F32 patchCord10(iqMixer1,1, mixer4_2, 1);
// mixer4_2 is transmitter SSB output, iqMixer2 is receiver input
AudioConnection_F32 patchCord14(mixer4_2,0, iqMixer2, 0);
AudioConnection_F32 patchCord3(iqMixer2, 0, filter90deg1, 0);
AudioConnection_F32 patchCord4(iqMixer2, 1, filter90deg1, 1);
AudioConnection_F32 patchCord7(filter90deg1, 0, mixer4_1, 0);
AudioConnection_F32 patchCord8(filter90deg1, 1, mixer4_1, 1);
AudioConnection_F32 patchCord11(mixer4_1, 0, audioOutput, 0);
AudioConnection_F32 patchCord12(mixer4_1, 0, audioOutput, 1);
AudioConnection_F32 patchCord13(mixer4_2, 0, fft1, 0);
AudioControlSGTL5000 sgtl5000_1;
// Use these with the Teensy 4.x Rev D Audio Shield (NOT for T3.x)
#define SDCARD_CS_PIN_Z 10
#define SDCARD_MOSI_PIN_Z 11
#define SDCARD_SCK_PIN_Z 13
// Filter for AudioFilter90Deg_F32 hilbert1, only for receiving the CESSB
#include "hilbert251A_Z_.h"
// wavData is a global struct, definined in AudioSDPlayer_F32.h
// This provides information about the current WAV file to this .INO
struct wavData* pCurrentWavData;
// And data about the CESSB
struct levelsZ* pLevelData;
uint32_t writeOne = 0;
uint32_t cntFFT = 0;
uint32_t ttt; // For timing test audio
uint32_t tp;
void setup() { // ********** SETUP **********
Serial.begin(9600); delay(1000);
Serial.println("*** Test CESSB Zero-IF from SD Card Voice Sample ***");
AudioMemory_F32(70, audio_settings);
pCurrentWavData = playWav1.getCurrentWavData();
sgtl5000_1.enable();
delay(500);
SPI.setMOSI(SDCARD_MOSI_PIN_Z);
SPI.setSCK(SDCARD_SCK_PIN_Z);
Serial.print("SD.begin() returns "); Serial.println(SD.begin(SDCARD_CS_PIN_Z));
// sine0.frequency(468.75f); // 2-tone generators
// sine0.amplitude(0.707107);
sine1.frequency(750.0f);
sine1.amplitude(0.707107);
// Build the CESSB SSB transmitter
// The WAV file has carefully controlled 0.707 peaks. We bring these to 1.000
mixer4_0.gain(0, 1.41421356f); // Play WAV file on
mixer4_0.gain(2, 0.0); // Sine Wave 1 off
cessb1.setSampleRate_Hz(48000.0f);
// Set input, correction, and output gains
float32_t Pre_CESSB_Gain = 1.5f; // Use to set amount of clipping, 1.0 to 2.0f, 3 is excessive
cessb1.setGains(Pre_CESSB_Gain, 1.4f, 1.0f);
cessb1.setSideband(false);
pLevelData = cessb1.getLevels(0); // Gets pointer to struct
// Generate SSB at 15 kHz from zero-IF signal of CESSB generator
iqMixer1.useTwoChannel(true);
iqMixer1.frequency(15000);
mixer4_2.gain(1, 1.0f); // 1.0f for LSB, -1.0f for USB
// Need a receiver for the SSB transmitter to let us hear the results.
iqMixer2.frequency(15000.0f);
iqMixer2.useTwoChannel(false);
filter90deg1.begin(hilbert251A, 251);
mixer4_1.gain(0, -1.0f); // LSB, + for USB
audioOutput.setGain(0.02); // <<< Output volume control
fft1.setOutputType(FFT_DBFS);
fft1.windowFunction(AudioWindowBlackmanHarris1024);
fft1.setNAverage(16);
ttt = millis(); // Time test audio
tp=millis();
}
void playFile(const char *filename) {
if(playWav1.isPlaying())
return;
Serial.println("");
Serial.print("Playing file: ");
Serial.println(filename);
playWav1.play(filename); // Start playing the file.
// A brief delay for the library read WAV info
delay(25);
Serial.print("WAV file format = "); Serial.println(pCurrentWavData->audio_format);
Serial.print("WAV number channels = "); Serial.println(pCurrentWavData->num_channels);
Serial.print("WAV File Sample Rate = "); Serial.println(pCurrentWavData->sample_rate);
Serial.print("Number of bits per Sample = "); Serial.println(pCurrentWavData->bits);
Serial.print("File length, seconds = ");
Serial.println(0.001f*(float32_t)playWav1.lengthMillis(), 3);
}
void loop() {
uint32_t tt=millis() - ttt;
if(tt < 2000)
{
// Thanks to W9GR for the test file, W9GR48.WAV. This is intended for testing
// the CESSB radio transmission system.
playFile("W9GR48.WAV");
mixer4_0.gain(0, 1.41421356f); // Play WAV file on
mixer4_0.gain(1, 0.0f); // Sine Wave 1 off
}
else if(tt > 12300 && tt<13300)
{
mixer4_0.gain(1, 0.0f); // Play WAV file off
// The following puts a 1-sec 750 Hz, full amplitude tone into the input
// .707 on the generator and 1.414 here make the peak sine wave 1.000 at the CESSB input
mixer4_0.gain(1, 1.41421356f); // Sine Wave 1 on, 750 Hz
}
else if(tt >= 13300)
{
mixer4_0.gain(0, 1.41421356f); // Play WAV file on
mixer4_0.gain(1, 0.0f); // Sine Wave 1 off
ttt = millis(); // Start again
}
delay(1);
// Un-comment the following to print out the spectrum
/*
if(fft1.available() && ++cntFFT>100 && cntFFT<102)
{
for(int kk=0; kk<512; kk++)
{
Serial.print(46.875f*(float32_t)kk); Serial.print(",");
Serial.println(fft1.read(kk));
}
}
*/
if(cessb1.levelDataCount() > 300) // Typically 300 to 3000
{
cessb1.getLevels(1); // Cause write of data to struct & reset
// Detailed Report
Serial.print(10.0f*log10f(pLevelData->pwr0));
Serial.print(" In Ave Pwr Out ");
Serial.println(10.0f*log10f(pLevelData->pwr1));
Serial.print(20.0f*log10f(pLevelData->peak0));
Serial.print(" In Peak Out ");
Serial.println(20.0f*log10f(pLevelData->peak1));
Serial.print(pLevelData->peak0, 6);
Serial.print(" In Peak Volts Out ");
Serial.println(pLevelData->peak1, 6);
Serial.print("Enhancement = ");
float32_t enhance = (10.0f*log10f(pLevelData->pwr1) - 20.0f*log10f(pLevelData->peak1)) -
(10.0f*log10f(pLevelData->pwr0) - 20.0f*log10f(pLevelData->peak0));
if(enhance<1.0f) enhance = 1.0f;
Serial.print(enhance); Serial.println(" dB");
/*
// CSV Report suitable for entering to spread sheet
// InAve, InPk, OutAve, OutPk, EnhancementdB
Serial.print(pLevelData->pwr0, 5); Serial.print(",");
Serial.print(pLevelData->peak0, 5); Serial.print(",");
Serial.print(pLevelData->pwr1, 5); Serial.print(",");
Serial.print(pLevelData->peak1, 5); Serial.print(",");
float32_t enhance = (10.0f*log10f(pLevelData->pwr1) - 20.0f*log10f(pLevelData->peak1)) -
(10.0f*log10f(pLevelData->pwr0) - 20.0f*log10f(pLevelData->peak0));
if(enhance<1.0f) enhance = 1.0f;
Serial.println(enhance);
*/
}
}