Area-sound reproduction system and area-sound reproduction method

An area-sound reproduction system, comprising:

• a speaker array including a plurality of speakers linearly arranged side by side;
• a sound collector configured to collect an environment sound in an environment where the area-sound reproduction system is installed;
• a processor;
• and
• a memory having a computer program stored thereon, the computer program causing the processor to execute operations, including
• adjusting signals that the plurality of speakers are caused to output as reproduced sounds according to a reproduction condition on a control line, wherein the control line includes
• (i) a reproduction line in which sound waves emitted from the speaker array have constructive interference with each other, and
• (ii) a non-reproduction line in which the sound waves have destructive interference with each other,
• the reproduction line and the non-reproduction line being set at a position substantially in parallel with the speaker array and apart from the speaker array by a predetermined distance, and
• causing the plurality of speakers to output the reproduced sounds,
• wherein the adjusting further includes
• determining a noise level from the collected environment sound, and
• adjusting signals to be output as the reproduced sounds, such that at each frequency,
• a sound pressure of the reproduced sound reaching the reproduction line on the control line exceeds the noise level, and
• a sound pressure of the reproduced sound reaching the non-reproduction line on the control line does not exceed the noise level.