CANCELLATION APPARATUS, METHOD AND PROGRAM
A cancellation device includes a sound signal processing unit 2 that generates a cancellation signal for suppressing noise acquired by one or more reference microphones 1 for acquiring noise, and one or more cancellation loudspeakers 3 that emit sound on the basis of the cancellation signal. The sound signal processing unit 2 generates the cancellation signal on the basis of sound signals obtained by one or more error microphones 4 disposed in a region where noise is desired to be suppressed, and the one or more reference microphones 1 have directivity and are disposed in the vicinity of the cancellation loudspeakers 3.
1 . A cancellation device comprising:
processing circuitry configured to generate a cancellation signal for suppressing noise acquired by one or more reference microphones for acquiring noise; and
one or more cancellation loudspeakers configured to emit sound on the basis of the cancellation signal,
wherein the processing circuitry generates the cancellation signal on the basis of sound signals obtained by one or more error microphones disposed in a region where noise is desired to be suppressed, and
the one or more reference microphones have directivity and are disposed in the vicinity of the cancellation loudspeakers.
2 . The cancellation device according to claim 1 ,
wherein the one or more cancellation loudspeakers are enclosure-less loudspeakers.
3 . The cancellation device according to claim 1 ,
wherein the number of the one or more reference microphones is one, and
the reference microphone has directivity in a direction in which sound coming from the one or more cancellation loudspeakers is weaker than in a direction in which sound coming from the one or more cancellation loudspeakers is strong.
4 . The cancellation device according to claim 1 ,
wherein the number of the one or more reference microphones is two or more, some of the one or more reference microphones have directivity in a direction in which sound coming from the one or more cancellation loudspeakers is weaker than in a direction in which sound coming from the one or more cancellation loudspeakers is strong, and
the rest of the one or more reference microphones have directivity in a direction in which the noise arrives.
5 . The cancellation device according to claim 1
the processing circuitry further configured to dynamically control the directivity.
6 . A cancellation method comprising:
a sound signal processing step of generating, by processing circuitry, a cancellation signal for suppressing noise acquired by one or more reference microphones for acquiring noise; and
a sound emitting step of emitting, by the processing circuitry, sound on the basis of the cancellation signal,
wherein the sound signal processing step includes generating the cancellation signal on the basis of sound signals obtained by one or more error microphones disposed in a region where noise is desired to be suppressed, and
the one or more reference microphones have directivity and are disposed in the vicinity of the cancellation loudspeakers.
7 . A non-transitory computer readable medium that stores a program for causing a computer to perform each step of the cancellation method according to claim 6 .