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ROHM presents speech synthesis IC for ADAS and AVAS

24th July 2020
Alex Lynn

ROHM Group company, LAPIS Semiconductor, has announced the automotive speech synthesis ICs, ML2253x series, optimised for audible notifications and sound effects in ADAS (Advanced Driver Assistance System) and AVAS (Acoustic Vehicle Alerting System).

The ML2253x Speech Synthesis ICs provide an innovative technology as well as features for higher safety, increased flexibility on application level, thus reducing overall system costs and simplifying the hardware and software design.

“ROHM is embracing the growing market and increased safety demand by the auto makers for reliable voice and sound generation systems,” said Stefan Drouzas, Senior Application Marketing Manager at ROHM Semiconductor.

Utilising a new 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-digitises the analogue 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).

LAPIS Semiconductor offers the SDCK3 development tool that allows users to create voice data as well as prepare, write, and listen to ROM data stored in LAPIS Semiconductor's speech synthesis IC. Combining SDCK3 with an optional reference board that enables comprehensive evaluation for both hardware and software.

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