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adcsample_t *process_data(adcsample_t *samples, unsigned int size)
{
constexpr float alpha = 0.7;
constexpr unsigned int D = 2000;
static adcsample_t output[SIZE];
static adcsample_t prev[D]; // prev[0] = output[0 - D]
// Do calculations with previous output
for (unsigned int i = 0; i < D; i++)
output[i] = samples[i] + alpha * (prev[i] - 2048);
// Do calculations with current samples
for (unsigned int i = D; i < size; i++)
output[i] = samples[i] + alpha * (output[i - D] - 2048);
// Save outputs for next computation
for (unsigned int i = 0; i < D; i++)
prev[i] = output[size - (D - i)];
return output;
}
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