Audio effects
¶
Overview
¶
Comb filters
Harmonic Distortion
Amplitude Modulation
Vocoder
Feedforward
¶
$$y[n] = x[n] + \alpha x[n-K]$$$$h[n] = \delta [n] + \alpha \delta[n-K]$$
Feedback
¶
$$ y[n] = x[n] + \alpha y[n-K] $$
Flanger
¶
A flanger is a comb filter whose delay $K[n]$ slowly oscillates within some range $\pm R$
$$y[n] = x[n] + \alpha x\left[n-K[n]\right]$$$$K[n] = R \cos(\omega_{\text{flanger}}) + \frac{R}{2}$$
Harmonic Distortion
¶
Modeling speech
¶
Vocoder
¶