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

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+/**
+ * @file channel-converter-decimate.ino
+ * @author Urs Utzinger
+ * @brief Reduce samples by binning; which is summing consecutive samples and optionally dividing by the number of samples summed.
+ * @copyright GPLv3
+ **/
+ 
+#include "AudioTools.h"
+#define FACTOR 4
+
+AudioInfo                     info1(44100, 1, 16);
+AudioInfo                     info2(44100, 2, 16);
+AudioInfo                     info_out(44100/FACTOR, 2, 16);
+SineWaveGenerator<int16_t>    sineWave1(16000); // subclass of SoundGenerator with max amplitude of 16000
+SineWaveGenerator<int16_t>    sineWave2(16000); // subclass of SoundGenerator with max amplitude of 16000
+GeneratedSoundStream<int16_t> sound1(sineWave1); // stream generated from sine wave
+GeneratedSoundStream<int16_t> sound2(sineWave2); // stream generated from sine wave
+InputMerge<int16_t>           imerge(sound1,sound2);
+Decimate                      decimater(FACTOR, 2, 16);  // decimate by FACTOR on each channel
+ConverterStream<int16_t>      decimated_stream(imerge, decimater);  // pipe the sounds to the decimater
+CsvOutput<int16_t>            serial_out(Serial);  // serial output
+StreamCopy                    copier(serial_out, decimated_stream); // stream the decimater output to serial port
+
+// Arduino Setup
+void setup(void) {  
+
+ // Open Serial 
+  Serial.begin(115200);
+  while(!Serial);
+
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // Setup sine wave
+  sineWave1.begin(info1, N_B4);
+  sineWave2.begin(info1, N_B5);
+
+  // Merge input to stereo
+  imerge.begin(info2);
+
+  // Define CSV Output
+  serial_out.begin(info_out);
+
+ }
+
+// Arduino loop - copy sound to out with conversion
+void loop() {
+  copier.copy();
+}