Filter tests

Author: pschatzmann

src/AudioTools/MusicalNotes.h

@@ -128,15 +128,19 @@ class MusicalNotes {
     /// Determines the frequency of the indicate note and octave (0-8)
     int frequency(MusicalNotesEnum note, uint8_t octave){
         if (note>11) return 0;
-        if (octave>7) return 0;
+        if (octave>8) return 0;
         return notes[octave][note];
     }
 
     /// Determines the frequency of the indicate note index from 0 to 107
     int frequency(uint16_t idx){
         MusicalNotesEnum mainNote = (MusicalNotesEnum) (idx % 12);
-        uint8_t level = idx / 12;
-        return frequency(mainNote, level);
+        uint8_t octave = idx / 12;
+        return frequency(mainNote, octave);
+    }
+
+    int frequencyCount() {
+        return 108;
     }
 
     /// Determines the frequency of the indicate main note index (0-6)  and octave (0-8)

tests/filter-wav/noise.wav renamed to src/AudioTools/wave.wav

@@ -5,54 +5,58 @@
 #include "SdFat.h"
 
 // define FIR filter
-float coef[] = { 
--0.018296746249137946,
--0.056723974384224739,
-0.018540799820324621,
-0.097644454515593698,
--0.018688161556077588,
--0.297627121039396536,
-0.550301497785836702,
--0.297627121039396536,
--0.018688161556077588,
-0.097644454515593698,
-0.018540799820324621,
--0.056723974384224739,
--0.018296746249137946
+int16_t coef[] = { 
+-600,
+-1859,
+608,
+3200,
+-612,
+-9752,
+18032,
+-9752,
+-612,
+3200,
+608,
+-1859,
+-600
 };
 // 
 uint16_t sample_rate=44100;
 uint8_t channels = 2;                                             // The stream will have 2 channels 
-NoiseGenerator<int16_t> noise(32000);                             // subclass of SoundGenerator with max amplitude of 32000
-GeneratedSoundStream<int16_t> in_stream(noise);                   // Stream generated from sine wave
-FilteredStream<int16_t, float> in_filtered(in_stream, channels);  // Defiles the filter as BaseConverter
+SineWaveGenerator<int16_t> wave(32000);                             // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> in_stream(wave);                   // Stream generated from sine wave
+FilteredStream<int16_t, int16_t> in_filtered(in_stream, channels);  // Defiles the filter as BaseConverter
 SdFat sd;
 SdFile file;
 EncodedAudioStream out(&file, new WAVEncoder());                  // encode as wav file
 StreamCopy copier(out, in_filtered);                                // copies sound to out
+MusicalNotes notes;
 
 void setup(){
   Serial.begin(115200);
   AudioLogger::instance().begin(Serial, AudioLogger::Info);  
 
-  auto cfg = noise.defaultConfig();
+  auto cfg = wave.defaultConfig();
   cfg.sample_rate = sample_rate;
   cfg.channels = channels;
   cfg.bits_per_sample = 16;
-  noise.begin(cfg);
+  wave.begin(cfg, 20);
   in_stream.begin();
   out.begin();
 
   // setup filters on channel 1 only
-  in_filtered.setFilter(1, new FIR<float>(coef));
+  in_filtered.setFilter(1, new FIR<int16_t>(coef));
 
   if (!sd.begin(SS, SPI_HALF_SPEED)) sd.initErrorHalt();
-  if (!file.open("noise.wav", O_RDWR | O_CREAT)) {
-    sd.errorHalt("opening noise.wav for write failed");
+  if (!file.open("wave.wav", O_RDWR | O_CREAT)) {
+    sd.errorHalt("opening wave.wav for write failed");
   }
 
-  for (int j=0;j<1024;j++){
-    copier.copy();
+  for (int j=0;j<notes.frequencyCount();j++){
+      wave.setFrequency(notes.frequency(j));
+      for (int i=0;i<20;i++){
+        copier.copy();
+      }
   }
   file.close();
   stop();