| 摘要 |
PROBLEM TO BE SOLVED: To create a plurality of distribution areas using a non-audible sound speaker at one place.SOLUTION: A data distribution system comprises: a transmitter comprising a main sound source, a plurality of auxiliary sound sources mounted, separately from the main sound source, on the main sound source to have directivity of transmitting auxiliary sound waves as a non-audible sound having a single wavelength such that a direction thereof divides an arrival region of the non-audible sound that the main sound source transmits, and a control part which makes the main sound source transmit the non-audible sound including divided digital data in order and also makes the plurality of auxiliary sound sources transmit auxiliary sound waves in predetermined order; and a receiver which extracts digital data from the non-audible sound from the main sound source, and receives one of periodically received auxiliary sound waves of the plurality of auxiliary sound sources and measuring the timing of the reception of the auxiliary sound wave when receiving digital data composed of the non-audible sound.SELECTED DRAWING: Figure 1 |
