Reference design; voice input remote control minimises power

August 30, 2016 // By Graham Prophet
Nordic Semiconductor’s smart remote control reference design combines voice input performance with ultra low power consumption; the 'nRFready Smart Remote 3 for nRF52 Series' is a complete state-of-the-art hardware and software single-chip Bluetooth low energy reference design.

Featuring voice input speech recognition control, digital mic option, keyboard matrix, six-axis motion sensing, multitouch trackpad, infrared LED, NFC Touch-to-Pair, and on-board buzzer implementing the Bluetooth low energy Find Me Profile, this reference design claims leading voice control performance and power consumption

Nordic Semiconductor’s (Oslo, Norway) reference design uses the company’s nRF52832 Bluetooth low energy SoC; targeting remote control OEMs/ODMs and manufacturers of smart TVs, set-top boxes, and digital media devices, the design aims to deliver a rich, intuitive, and engaging end-user experience. It features voice input for speech recognition-driven search and control functions using a pair of PDM microphones employed for echo and noise cancellation. There is also a digital mic input option, six-axis motion sensor 'Air-mouse' for physical gesture control, multi-touch trackpad, a matrix of programmable keyboard buttons, legacy IR hardware support, user-friendly NFC Touch-to-Pair (future software release), and an on-board buzzer that implements the Bluetooth low energy Find Me Profile.


"With the extra processing performance of the nRF52832 and on-chip PDM support we have been able to extend the audio functionality of our existing nRFready Smart Remote 3 for nRF51 Series reference design to now include two digital microphones and all required signal processing in a single-chip implementation for state-of-the-art voice input search and control of home media devices," comments John Leonard, Product Marketing Manager at Nordic Semiconductor.


"The ...computing power of the nRF52832 combined with its unique set of peripherals has allowed us to optimize every major function of the remote control reference design, and do some really effective audio noise cancellation and associated audio compression on voice data. This includes being able to sample a much cleaner voice signal so the compression can be pushed much further resulting in less on-air data and associated power saving benefits."


nRFready Smart Remote 3 for nRF52 Series supports a range of popular audio compression formats including Opus, Broadvoice, and ADPCM. It comes complete with all