Sound signal output system and sound signal output method

A sound signal output system used for a user to listen to a sound signal, the sound signal output system comprising:

• at least one sound signal output apparatus that is installed toward a guide destination position and emits the sound signal;
• and
• a controller that controls emission by the sound signal output apparatus,
• wherein
• the sound signal output apparatus includes
• a concave reflector that has a rotational paraboloid or a surface approximate to the rotational paraboloid inside, and
• a first driver that is disposed inside the reflector,
• a sound signal emitted from the first driver to one side is set as a first sound signal, and a sound signal emitted from the first driver to an other side is set as a second sound signal,
• in a case where the first sound signal is emitted from the one side of the first driver and the second sound signal is emitted from the other side of the first driver, an attenuation rate of the first sound signal at a second point that is a point farther from the sound signal output apparatus than a first point with reference to the first point that is a predetermined guide destination where the first sound signal reaches is
• configured to be less than or equal to a predetermined value smaller than an attenuation rate of a sound signal due to air propagation at the second point with reference to the first point, or
• an attenuation amount of the first sound signal at the second point with reference to the first point is configured to be larger than or equal to a predetermined value larger than an attenuation amount of a sound signal due to air propagation at the second point with reference to the first point.

A sound signal output method for use in a predetermined area including a first area for indicating a warning and a second area adjacent to the first area and having a lower necessity for indicating the warning than the first area, the sound signal output method comprising:

• disposing a plurality of sound signal output apparatuses that emits a sound signal in the first area or in a vicinity of the first area;
• and
• causing a controller to control emission by the plurality of sound signal output apparatuses using a sound source corresponding to the warning,
• wherein
• each of the sound signal output apparatuses
• is allocated with a different sub-area in a case where the predetermined area includes a plurality of sub-areas including a first sub-area in the first area and a second sub-area adjacent to the first sub-area and in the second area, and
• includes
• a concave reflector that has a rotational paraboloid or a surface approximate to the rotational paraboloid inside, and
• a first driver that is disposed inside the reflector,
• a sound signal emitted from the first driver to one side is set as a first sound signal, and a sound signal emitted from the first driver to an other side is set as a second sound signal,
• when the first sound signal is emitted from the one side of the first driver and the second sound signal is emitted from the other side of the first driver, an attenuation rate of the first sound signal at a second point in the second sub-area of the allocated sub-area, the second point being a point farther from the sound signal output apparatus than a first point with reference to the first point in the first sub-area of the allocated sub-area, the first point being a predetermined point where the first sound signal reaches is
• configured to be less than or equal to a predetermined value smaller than an attenuation rate of a sound signal due to air propagation at the second point with reference to the first point, or
• an attenuation amount of the first sound signal at the second point with reference to the first point is configured to be equal to or more than a predetermined value larger than an attenuation amount of the sound signal due to air propagation at the second point with reference to the first point.

A sound signal output method used for a user to listen to a sound signal, the sound signal output method comprising:

• installing at least one sound signal output apparatus that emits the sound signal toward a guide destination position;
• and
• causing a controller to control emission by the sound signal output apparatus,
• wherein
• the sound signal output apparatus includes
• a concave reflector that has a rotational paraboloid or a surface approximate to the rotational paraboloid inside, and
• a first driver that is disposed inside the reflector,
• a sound signal emitted from the first driver to one side is set as a first sound signal, and a sound signal emitted from the first driver to an other side is set as a second sound signal,
• in a case where the first sound signal is emitted from the one side of the first driver and the second sound signal is emitted from the other side of the first driver, an attenuation rate of the first sound signal at a second point that is a point farther from the sound signal output apparatus than a first point with reference to the first point that is a predetermined guide destination where the first sound signal reaches is
• configured to be less than or equal to a predetermined value smaller than an attenuation rate of a sound signal due to air propagation at the second point with reference to the first point, or
• an attenuation amount of the first sound signal at the second point with reference to the first point is configured to be larger than or equal to a predetermined value larger than an attenuation amount of a sound signal due to air propagation at the second point with reference to the first point.