SOUND SYSTEM
A sound system includes: a control system that generates a control signal for erasing noise from a signal of the noise in a place close to a head of a user who uses a seat; a silencing speaker system that is installed at the place close to the head of the user who uses the seat and includes M speaker units each emitting a sound based on the control signal; and an emission suppression unit including at least a sound absorbing material that easily absorbs only a sound having a frequency greater than or equal to a predetermined value and configured to make it difficult for the sound having the frequency greater than or equal to the predetermined value emitted from the silencing speaker units to be emitted to a place other than an ear of the user. The m-th silencing speaker unit is arranged so that a sound emitted from the m-th silencing speaker unit in the m-th silencing user direction is silenced at a place other than a place close to the head of the user who uses the seat due to coming around of a sound emitted from the m-th silencing speaker unit in a direction opposite to the m-th silencing user direction.
1 . A sound system comprising:
a control system that generates a control signal for erasing noise from a signal of the noise (hereinafter, the signal of the noise is referred to as a noise signal);
a silencing speaker system includes M speaker units each emitting a sound based on the control signal (hereinafter, the speaker units are referred to as silencing speaker units),
wherein M is an integer greater than or equal to 1,
the M silencing speaker units are defined as a first silencing speaker unit, . . . , and an M-th silencing speaker unit,
a direction in which an m-th silencing speaker unit faces a user who uses a seat is defined as an m-th silencing user direction (m=1, . . . , M), and
a sound emitted from the m-th silencing speaker unit in the m-th silencing user direction is silenced at a place other than a place close to a head of the user who uses the seat, due to coming around of a sound emitted from the m-th silencing speaker unit in a direction opposite to the m-th silencing user direction.
2 . The sound system according to claim 1 , further comprising a member arranged to lengthen a sound path in which a sound emitted from the m-th silencing speaker unit in the direction opposite to the m-th silencing user direction comes around in the m-th silencing user direction.
3 . The sound system according to claim 2 , wherein the speaker units are installed at the place close to the head of the user who uses the seat.
4 . The sound system according to claim 1 , wherein the speaker units are installed in earphones or headphones.