Speech synthesis chip targets ADAS and AVAS

July 27, 2020 //By Christoph Hammerschmidt
Speech synthesis chip targets ADAS and AVAS
Known from large airliner cockpits and sci-fi movies, speed synthesis is now expanding to the automotive world. Through its subsidiary Lapis Semiconductor Co, chipmaker Rohm is introducing the ML2253x speech synthesis IC family for automotive use. It is optimized for audible notifications and sound effects in ADAS (Advanced Driver Assistance System) and AVAS (Acoustic Vehicle Alerting System).

The ML2253x Speech Synthesis ICs is intended to increase safety and flexibility on application level, thus reducing overall system costs and simplifying the hardware and software design. Utilizing a state of the art compression method (HQ-ADPCM), the ML2253x series provides superior audio playback with reduced memory usage for storing audio data.

The integrated Sound Continuity Detection re-digitizes the analog speaker output signal and compares it with the playback data stored in the internal or external memory. The main MCU receives a feedback in case the data is exceeding a predefined value e.g. in case of skipping.

In addition, a number of essential detection functions are also built in, including short-circuit, high-temperature, and command transfer error detection, contributing to improved reliability in automotive applications.

To increase the flexibility of development from day one and even beyond shipment of the final product, the memory content can be updated through the main MCU, once connected to a communication network (IoT).

More information: https://www.lapis-semi.com/en/semicon/speech/

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