If you meant a specific person named David, the cepstral analysis framework below still applies—simply replace the vocal identity with your target speaker.
Smoothed CPP (CPPS): A variant that applies a smoothing factor across time or quefrency to improve stability, often used to better correlate with auditory-perceptual judgments like breathiness.
Background: Cepstrum and Its Relevance to Voice
David didn’t remember dying. One moment, he was a fifty-three-year-old linguistics professor choking on a grape at a faculty dinner; the next, he was a voice in a machine. Not a metaphor. Not a ghost in the wires. A literal voice, clean and crisp, stored as ones and zeros in a server farm in Ashburn, Virginia.