SOUND WAVE COMMUNICATION SYSTEM EQUIPPED WITH SOUND WAVE SIGNAL OUTPUT DEVICE, AND PORTABLE TERMINAL DEVICE USING THIS SYSTEM
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United States of America Patent
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Issued Date -
Jul 14, 2016
app pub date -
Jun 16, 2014
filing date -
Jun 16, 2014
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Abstract
ID transmitters, each of which can output a sound wave signal comprising sine waves of different frequencies, are installed apart from one another so that areas where each sound wave signal reaches are different. A predetermined number of frequencies, which are included in a frequency range that uses an uppermost audio frequency range, correspond to a predetermined number of bits with the value of each bit being expressed by the presence or absence of the output of the sine wave of the corresponding frequency. Information is divided into items of partial information with each item of partial information being expressed by at least part of the predetermined number of bits of the sound wave signal. An ID transmitter switches at predetermined time intervals the sound wave signal to be outputted, thereby cyclically outputting sound wave signals expressing the items of partial information in the order the information is formed.
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