Enabling voice activation in portable devices

06 October 2015

ON Semiconductor introduces an “always listening” voice trigger System-on-Chip (SoC) solution designed for popular consumer electronics devices.

Using an audio pattern-matching algorithm developed by ON Semiconductor, BelaSigna R281 can detect a single, user-trained trigger phrase. This phrase can be any series of sounds, and is neither speech nor language dependent. Upon recognising this trigger phrase, BelaSigna R281 will assert a wake-up signal which, when connected to a host controller, alleviates the need for users to touch their device to wake it prior to use. 

Based on ultra-low-power technology developed for the advanced hearing aid solutions, BelaSigna R281 has virtually no impact on standby battery life. Unlike some standalone solutions which are only compatible with digital microphones, BelaSigna R281’s mixed-signal architecture works with both analogue and digital microphone signals. The device provides a configurable, regulated microphone supply to facilitate simple integration. Other key features of BelaSigna R281 include an I2C interface for configuration and control, a configurable GPIO wake-up signal, and an internal oscillator. 

BelaSigna R281 is available in a 5 x 5 mm QFN32 package and will soon also be available in an ultra-miniature 2.42 x 2.74 mm WLCSP. Both packages can be designed onto a single-sided PCB with 4 mil routing and a minimal amount of external components, providing one of the simplest solutions available for always-on, always-listening voice trigger.

“As the popularity of portable and wearable electronics devices has continued to grow, so has the demand for true hands-free operation” said: Michel De Mey, Senior Director, ON Semiconductor. “BelaSigna R281 supports voice triggered wake-up without placing unacceptable demands in terms of power, space, design-in complexity, and cost.”


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