Speech synthesis ICs dedicated for AVAS by ROHM

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The ROHM group company LAPIS Technology has developed the industry’s first speech synthesis ICs – the ML22120xx series (ML22120TB, ML22120GP) – designed for AVAS (Acoustic Vehicle Alerting System) in xEVs (electric vehicles).

The ML22120TB and the ML22120GP integrate hardware functions that include a warning sound generator, fader, and equalizer. Unlike MCU-based designs, the hardware configuration eliminates the need for software validation – significantly reducing development time. At the same time, dedicated GUI software makes it easy to comply with regulations for volume and frequency characteristics required for AVAS.

The system of new ICs can be controlled by simple commands, allowing warning sound to be started in less than one-tenth the time of conventional MCU-generated systems. An included fault detection function detects both erroneous communication with the main controller and erroneous oscillation caused by external components – contributing to vehicle reliability.

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