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Update InputFFT.ino #265

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Merged
merged 1 commit into from
Feb 26, 2025
Merged

Update InputFFT.ino #265

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6 changes: 6 additions & 0 deletions Arduino_package/hardware/libraries/AudioCodec/examples/InputFFT/InputFFT.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -12,11 +12,13 @@

#define SAMPLERATE 16000
#define SAMPLECOUNT 128
#define GAIN_FACTOR 1.0 // Gain factor (can be adjusted), Cannot be 0 as it will mute the signal

int16_t audio_buffer[SAMPLECOUNT] = {0};
float fft_buffer[SAMPLECOUNT/2] = {0};
uint16_t freq_bins[SAMPLECOUNT/2] = {0};
int i = 0;
int audioBufferMaxValue = INT16_MAX; // 16-bit signed audio data (Refer to int16_t audio_buffer[SAMPLECOUNT])

FFT fft;

Expand All @@ -38,6 +40,10 @@ void setup() {
void loop() {
if (Codec.readAvaliable()) {
Codec.readDataPage(audio_buffer, SAMPLECOUNT); // read latest received data from buffer
for (int i = 0; i < SAMPLECOUNT; i++) {
audio_buffer[i] *= constrain(audio_buffer[i] * GAIN_FACTOR, -audioBufferMaxValue, audioBufferMaxValue); // Clamping to avoid overflow and amplify each sample
}

fft.calculate(audio_buffer, fft_buffer, SAMPLECOUNT);
for (i = 0; i < (SAMPLECOUNT/2); i++) {
if (fft_buffer[i] > 0.01) {
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