The term "Cepstral" (a play on the word "spectral") refers to the mathematical analysis used to separate the "excitation" (the vocal cords) from the "filter" (the throat and mouth). This process is what allows David to sound human rather than metallic. ScienceDirect.com
Cepstral was founded in 2000 by a team of researchers and engineers who aimed to create more natural-sounding voices for voice synthesis applications. The company's early work focused on developing voices for the telecommunications industry, where there was a growing demand for high-quality, automated voice solutions. The Cepstral David voice was one of the company's first major breakthroughs, offering a significantly more natural-sounding alternative to earlier voice synthesis technologies. cepstral david voice work