Design of a knock tracking system based on TDOA method for responsive environment application

Hungchi Wang, Jyh Ching Juang, Chunlin Lu, Chinheng Wu, Tsunghsien Tsai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The paper demonstrates a system that is capable of locating the position of knocks on top of a table for context-aware applications. Four sensors, located near the table corners, are employed to record the acoustic waveform coming from the impacts. A microprocessor extracts relevant characteristics from these signals including amplitudes and differential timings, which are then used to estimate the location of the hit. As this system requires only simple hardware, no special adaptation of the touch screen is needed. Further, as all sensors are mounted on the inner surface, the system is easy to deploy as a retrofit to existing tables. The technique can be applied to detect commands in responsive environments.

Original languageEnglish
Pages (from-to)6727-6738
Number of pages12
JournalInternational Journal of Innovative Computing, Information and Control
Issue number12
Publication statusPublished - 2011 Dec 1

All Science Journal Classification (ASJC) codes

  • Software
  • Theoretical Computer Science
  • Information Systems
  • Computational Theory and Mathematics

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