How did Texas Instruments use integrated circuits in the Speak & Spell learning toy?

Texas Instruments utilized integrated circuits in the Speak & Spell learning toy by incorporating the company's first single-chip speech synthesizer, which was introduced in 1978.1

This innovation represented a significant advancement in consumer electronics, as it allowed for the compact, affordable, and reliable reproduction of synthetic speech sounds within a portable device designed for children. By integrating this technology onto a single chip, Texas Instruments successfully applied its expertise in semiconductor development—which had previously been used in military applications and pocket calculators—to create a mass-market educational product.21