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libraries/audio-tools/examples/tests/conversion/channel-converter-diff/channel-converter-diff.ino

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+/**
+ * @file channel-converter-diff.ino
+ * @brief Test calculating parwise difference of channels
+ * @author Urs Utzinger
+ * @copyright GPLv3
+ **/
+ 
+#include "AudioTools.h"
+
+AudioInfo                     info1(44100, 1, 16);
+AudioInfo                     info2(44100, 2, 16);
+SineWaveGenerator<int16_t>    sineWave1(16000);                    // subclass of SoundGenerator with max amplitude of 32000
+SineWaveGenerator<int16_t>    sineWave2(16000);                    // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound1(sineWave1);                   // stream generated from sine wave1
+GeneratedSoundStream<int16_t> sound2(sineWave2);                   // stream generated from sine wave2
+InputMerge<int16_t>           imerge;                              // merge two inputs to stereo
+ChannelDiff                   differ;                            // channel averager
+ConverterStream<int16_t>      diffed_stream(imerge, differ);   // pipe the sound to the averager
+CsvOutput<int16_t>            serial_out(Serial);                  // serial output
+StreamCopy                    copier(serial_out, diffed_stream); // stream the binner output to serial port
+
+// Arduino Setup
+void setup(void) {
+
+  // Open Serial 
+  Serial.begin(115200);
+  while(!Serial); // wait for Serial to be ready
+
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // Setup sine waves
+  sineWave1.begin(info1, N_B4);
+  sineWave2.begin(info1, N_B5);
+
+  // Merge input to stereo
+  imerge.add(sound1, 1);
+  imerge.add(sound2, 1);
+  imerge.begin(info2);
+
+  // Define CSV Output
+  serial_out.begin(info1);
+
+}  
+
+// Arduino loop - copy sound to out with conversion
+void loop() {
+  copier.copy();
+}