Method Step

nes/filter.go:19–24

(x float32)

}

func (f *FirstOrderFilter) Step(x float32) float32 {
	y := f.B0*x + f.B1*f.prevX - f.A1*f.prevY
	f.prevY = y
	f.prevX = x
	return y
}

// sampleRate: samples per second
// cutoffFreq: oscillations per second