Infineon Technologies have combined its radar and silicon microphone sensors with XMOS's audio processors to provide far field voice capture by audio beamforming combined with radar target presence detection. Together, they guarantee sound recognition and execution for digital voice assistance across a range of voice-controlled devices. Target applications are smart home as well as smart TV and set top box, secure keyless entry systems, and other voice-operated consumer devices.

 
Infineon-XMOS voice-recognition (cr) Figure 1: The Infineon audio sensors and the XMOS audio analyser.  

The performance of current MEMS microphone limits the effectiveness of systems: when multiple persons are speaking, the veracity and location of the voice source cannot be precisely identified and separated from inanimate object noise. Infineon’s 60GHz 2Tx/4Rx radar IC with accompanying antenna and the 70dB SNR microphone help to overcome these impediments. The microphones are based on the dual backplate MEMS technology from Infineon, and are well suited for far field voice capturing and beamforming. In addition, improving the SNR of the microphone will further enhance the performance.

The XMOS audio processor analyses the signal data from an array of Infineon’s digital microphones, adjusting the angular and distance data from each microphone to produce a beam at an angle identified by the radar data. A lit LED indicates presence detection and where sound is taken from.

The combination of Infineon radar and the XMOS beamformer allows the microphone to target a specific object precisely, even with the object moving and indistinctive noise. The microphone delivers clear voice-controlled systems, with understanding of commands and flawless execution that prevents unwanted activations of devices.