A wireless magnetoresistive sensing system for an intraoral tongue-computer interface

Hangue Park, Mehdi Kiani, Hyung Min Lee, Jeonghee Kim, Jacob Block, Benoit Gosselin, Maysam Ghovanloo

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Tongue drive system (TDS) is a tongue-operated, minimally invasive, unobtrusive, and wireless assistive technology (AT) that infers users' intentions by detecting their voluntary tongue motion and translating them into user-defined commands. Here we present the new intraoral version of the TDS (iTDS), which has been implemented in the form of a dental retainer. The iTDS system-on-a-chip (SoC) features a configurable analog front-end (AFE) that reads the magnetic field variations inside the mouth from four 3-axial magnetoresistive sensors located at four corners of the iTDS printed circuit board (PCB). A dual-band transmitter (Tx) on the same chip operates at 27 and 432 MHz in the Industrial/Scientific/Medical (ISM) band to allow users to switch in the presence of external interference. The Tx streams the digitized samples to a custom-designed TDS universal interface, built from commercial off-the-shelf (COTS) components, which delivers the iTDS data to other devices such as smartphones, personal computers (PC), and powered wheelchairs (PWC). Another key block on the iTDS SoC is the power management integrated circuit (PMIC), which provides individually regulated and duty-cycled 1.8 V supplies for sensors, AFE, Tx, and digital control blocks. The PMIC also charges a 50 mAh Li-ion battery with constant current up to 4.2 V, and recovers data and clock to update its configuration register through a 13.56 MHz inductive link. The iTDS SoC has been implemented in a 0.5-μm standard CMOS process and consumes 3.7 mW on average.

Original languageEnglish
Article number6392916
Pages (from-to)571-585
Number of pages15
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume6
Issue number6
DOIs
Publication statusPublished - 2012 Dec 1
Externally publishedYes

Fingerprint

Interfaces (computer)
Integrated circuits
Wheelchairs
Smartphones
Sensors
Personal computers
Printed circuit boards
Clocks
Transmitters
Switches
Magnetic fields
Power management
Lithium-ion batteries

Keywords

  • Assistive technologies
  • Duty cycling
  • Industrial-scientific- medical (ISM) band
  • Intraoral Tongue Drive System (iTDS)
  • Magnetoresistive sensors
  • System-on-a-chip

ASJC Scopus subject areas

  • Biomedical Engineering
  • Electrical and Electronic Engineering

Cite this

A wireless magnetoresistive sensing system for an intraoral tongue-computer interface. / Park, Hangue; Kiani, Mehdi; Lee, Hyung Min; Kim, Jeonghee; Block, Jacob; Gosselin, Benoit; Ghovanloo, Maysam.

In: IEEE Transactions on Biomedical Circuits and Systems, Vol. 6, No. 6, 6392916, 01.12.2012, p. 571-585.

Research output: Contribution to journalArticle

Park, Hangue ; Kiani, Mehdi ; Lee, Hyung Min ; Kim, Jeonghee ; Block, Jacob ; Gosselin, Benoit ; Ghovanloo, Maysam. / A wireless magnetoresistive sensing system for an intraoral tongue-computer interface. In: IEEE Transactions on Biomedical Circuits and Systems. 2012 ; Vol. 6, No. 6. pp. 571-585.
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