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INDOOR POSITION INFORMATION PROVIDING APPARATUS, POSITION NOTIFIER APPARATUS AND PROGRAM

  • US 20150378001A1
  • Filed: 06/22/2015
  • Published: 12/31/2015
  • Est. Priority Date: 06/26/2014
  • Status: Active Grant
First Claim
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1. A position information providing apparatus for providing present position information indicating a present position to a position notifier apparatus having a function to notify the present position, the position information providing apparatus comprising:

  • an ultrasonic wave output device that outputs ultrasonic wave having a predetermined ultrasonic frequency;

    a controller thathas a plurality of predetermined detectable frequencies which are within a frequency range detectable by a speech input device of the position notifier apparatus and which are lower than the ultrasonic wave frequency,sequentially selects one detectable frequency as a modulation frequency from among the plurality of detectable frequencies in accordance with contents of the present position information, andcontrols the ultrasonic wave output device so that a maximum value or a minimum value of amplitude of the ultrasonic wave varies with the selected modulation frequency.

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