| 摘要 |
PROBLEM TO BE SOLVED: To expand a sound collection range of acoustic communication without excessively increasing the volume of sound.SOLUTION: A sound emission system 12 comprises: a modulation unit M1 for generating an acoustic signal A1 including transmission data Z1 as an acoustic component in a frequency band B1, by modulating a carrier wave by using the transmission data Z1; a modulation unit M2 for generating an acoustic signal A2 including transmission data Z2 as an acoustic component in a frequency band B2 differing from the frequency band B1, by modulating a carrier wave by using the transmission data Z2; a sound emission device S1 for emitting an acoustic sound corresponding to the acoustic signal A1 generated by the modulation unit M1; and a sound emission device S2 for emitting an acoustic sound corresponding to the acoustic signal A2 generated by the modulation unit M2.SELECTED DRAWING: Figure 1 |
