Sunday 25th July 2021

Automotive grade speech synthesis launched with sound continuity detection

Published on September 9th, 2020

ROHM Group Company LAPIS Semiconductor Co., Ltd. has launched 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,” says Stefan Drouzas, senior application marketing manager at ROHM Semiconductor GmbH.

Utilising 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-digitises 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).

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