Speak & Spell: How a $25,000 Toy Project Taught Microchips to Talk

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In 1976, a small team at Texas Instruments led by Paul Breedlove began a side project with a budget of just 25,000 dollars. Two years later, at the Summer Consumer Electronics Show in 1978, they unveiled the Speak and Spell, the first educational toy to store whole spoken words in solid state memory with no moving parts. Earlier talking toys relied on tiny phonograph records and tape loops. This one ran on the TMC0280, the world's first single-chip voice synthesizer.

This episode explains the engineering behind that red and yellow box and follows its strange afterlife. Instead of storing recordings, the chip modeled the human vocal tract using linear predictive coding, squeezing speech down to about 1,000 bits per second. The same technology later warned Chrysler drivers that a door was ajar, helped E.T. phone home, and gave electronic musicians a machine they could deliberately break to produce new sounds.

The original voice belonged to Mitch Carr, a radio anchor at KRLD in Dallas, and engineers spent days hand-editing the data phoneme by phoneme to make single words intelligible.
A slot in the battery compartment took expansion cartridges such as Vowel Power and Super Stumpers, and a Secret Code game encrypted words with a Caesar cipher.
Foreign versions were recorded near Nice, France, then processed in Dallas, and the cartridges were not region-locked, so a French module worked in an American unit.
A 2019 revival by Basic Fun dropped the cartridge slot and the real synthesizer, using prerecorded audio filtered to sound robotic.
Circuit benders rewire vintage units to jam the keyboard matrix, and Depeche Mode named their 1981 debut album Speak and Spell.

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