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dsp-paw/gui/examples/6_iir_test.cpp

24 lines
563 B
C++

/**
* 6_iir_test.cpp
* Written by Clyne Sullivan.
*
* Implements a simple infinite impulse response (IIR) filter using an alpha
* parameter.
* To build upon this example, try setting `alpha` with a parameter knob:
* alpha = param1() / 4095.0
*/
Sample* process_data(Samples samples)
{
constexpr float alpha = 0.7;
static Sample prev = 2048;
samples[0] = (1 - alpha) * samples[0] + alpha * prev;
for (unsigned int i = 1; i < SIZE; i++)
samples[i] = (1 - alpha) * samples[i] + alpha * samples[i - 1];
prev = samples[SIZE - 1];
return samples;
}