A navigation system using ultrasonic directional speaker with rotating base

Kentaro Ishii, Yukiko Yamamoto, Michita Imai, Kazuhiro Nakadai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


This paper proposes new method for object reference which enables a person to find surrounding objects and develops a navigation system named CoCo. CoCo employs an ultrasonic directional speaker with a rotating base. Ultrasonic wave transmitted by an ultrasonic directional speaker is converted to audible sound when it reflects on floor, wall, or object. Based on this property, CoCo can emit audible sound from arbitrary place using a rotating base. When CoCo navigates a person to an object, CoCo transmits ultrasonic wave so as to hear audible sound continuously from the line between the ultrasonic directional speaker and the object. We designed and implemented an object management system as an application using 3D position sensors and a navigation system CoCo. This paper shows how CoCo navigates a person to an object using position data from an object management system.

Original languageEnglish
Title of host publicationHuman Interface and the Management of Information
Subtitle of host publicationInteracting in Information Environments - Symposium on Human Interface 2007. Held as Part of HCI International 2007, Proceedings
PublisherSpringer Verlag
Number of pages10
EditionPART 2
ISBN (Print)9783540733539
Publication statusPublished - 2007
EventSymposium on Human Interface 2007 - Beijing, China
Duration: 2007 Jul 222007 Jul 27

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
NumberPART 2
Volume4558 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


OtherSymposium on Human Interface 2007


  • Object reference
  • Position sensor
  • Ultrasonic directional speaker
  • Ultrasonic wave

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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