SPEAKER SYSTEM
A sound that cannot be heard by surrounding users is reproduced. A reproduction device ( 110 ) includes an n-th reproduction unit that outputs a 2n−1th acoustic signal (n=1, . . . , N) that is an acoustic signal obtained on the basis of a reproduction target and a 2n-th acoustic signal that is an acoustic signal having a phase opposite to that of the 2n−1th acoustic signal. A speaker system ( 120 ) includes a set of an n-th speaker unit pair ( 122 ) including a positive speaker unit ( 1221 ) that emits a 2n−1th acoustic signal-based sound and a negative speaker unit ( 1222 ) that emits a 2n-th acoustic signal-based sound, the n-th speaker unit pair being installed at a position close to a user's head.
1 . A speaker system that emits an acoustic signal that is audible to a user in the vicinity of a speaker and not audible to a user outside the vicinity of the speaker, the speaker system comprising:
a first speaker that emits the acoustic signal; and
a second speaker that emits the acoustic signal in a phase opposite to the first speaker.
2 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged on at least one of wall surfaces on which a display of a digital signage is installed.
3 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged in a terminal device that can be held by a human hand.
4 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged in a sound emission device held by a neck or a head of a human.
5 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged on at least one wall surface of a space having the wall surface.
6 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged on a desk.
7 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged on a bed.
8 . The speaker system according to claim 1 , wherein
the first speaker and the second speaker are arranged on clothing worn by a human.