52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#include "AudioTools.h"
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#include "AudioTools/AudioLibs/AudioRealFFT.h" // using RealFFT
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AudioRealFFT fft; // or AudioKissFFT
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Hann hann;
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BufferedWindow buffered(&hann);
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SineWaveGenerator<int16_t> sineWave(32000);
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GeneratedSoundStream<int16_t> in(sineWave);
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StreamCopy copier(fft, in);
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AudioInfo info(44100, 1, 16);
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float value = 0;
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// display fft result
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void fftResult(AudioFFTBase &fft) {
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float diff;
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auto result = fft.result();
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if (result.magnitude > 100) {
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Serial.print(result.frequency);
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Serial.print(" ");
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Serial.print(result.magnitude);
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Serial.print(" => ");
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Serial.print(result.frequencyAsNote(diff));
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Serial.print(" diff: ");
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Serial.print(diff);
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Serial.print(" - time ms ");
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Serial.print(fft.resultTime() - fft.resultTimeBegin());
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Serial.println();
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}
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}
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void setup() {
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
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// set the frequency
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sineWave.setFrequency(N_B4);
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// Setup sine wave
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auto cfg = in.defaultConfig();
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cfg.copyFrom(info);
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in.begin(cfg);
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// Setup FFT
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auto tcfg = fft.defaultConfig();
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tcfg.copyFrom(info);
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tcfg.length = 4096;
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tcfg.callback = &fftResult;
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tcfg.window_function = &buffered;
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fft.begin(tcfg);
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}
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void loop() { copier.copy(); } |