ABSTRACT

Figure 13.1. Filter view of additive formant synthesis, showing individual impulse responses of parallel formant filters.

the outputs of each individual filter in response to a single impulse. We know from our filter studies that the impulse response of a simple two-pole resonant filter is an exponentially decaying sinusoid. The resonance param eter determines the decay time of the filter, the center frequency parameter sets the frequency of the sinusoidal oscillation, and the phase is determined by the excitation time.