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Calling All Phones: From a Single-Chip Mobile Communicator to the Smart Phone of the Future

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2 Author(s)
Greg Delagi ; Texas Instruments Incorporated, Dallas ; Baher Haroun

Generally seen as an innovative educational toy, the Speak & Spell played a critical role in the introduction of cost effective and power-efficient voice digitization. Speak & Spell was one of the earliest handheld, battery operated consumer devices having a keyboard and display and produced audio from digitally synthesized sound stored in replaceable cartridge ROM and played through a special digital signal processing clip. Such a technology stood as a precursor to digital voice transmission and ultimately spurred the exponential growth of digital cellular by influencing subsequent technological innovations and trends.

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IEEE Solid-State Circuits Magazine  (Volume:4 ,  Issue: 2 )