Abstract: An optimum route of multiple mobile objects is estimated by: generating a time-series route candidate of a shortest route for each mobile object; generating a time-series route candidate of a detour route for each mobile object; calculating route assignment evaluation values for the shortest route and the detour route for each mobile object; calculating travel distance evaluation values for the shortest route and the detour route for each mobile object; calculating a route collision evaluation value of a combination for the shortest route and the detour route for each mobile object; and comparing a total value of the route assignment evaluation value, the travel distance evaluation value, and the route collision evaluation value for combinations of the time-series route candidates of the mobile objects, and estimating one of the combinations of the time-series route candidates of the mobile objects as the optimum route.

Abstract: A bass reflex port including: a tubular body portion; and a surface forming portion which is board-like, and continuous to an inner wall of the tubular body portion and which has a surface extending radially outwardly from an opening end of the tubular body portion disposed in a housing of a speaker, wherein the surface forming portion extends linearly in a direction away from a tube axis of the tubular body portion in a cross section parallel to the tube axis.

Abstract: An acoustic device includes an enclosure and a bass reflex port that includes a tube body. An inner wall surface of the tube body includes multiple regions in which viscous resistances in a tube axis direction of moving air and the inner wall surface are different. The multiple regions are provided along a circumferential direction of the inner wall surface. The tube body is attached to an opening area in the enclosure.

Abstract: A display tool includes a display part, a back part, a stable part, a leg part, and a bottom part. The display part is disposed in its erected state. The back part has its upper edge connected to an upper edge of the display part and is disposed behind the display part such that a distance between the back part and the display part gradually increases from the upper edges to lower edges of the back part and the display part. The stable part protrudes downwardly along the back part from a portion of the lower edge of the back part. The leg part protrudes downward direction from the remaining portion of the lower edge of the back part at an angle less than an angle at which the back part slants. The bottom part is connected to a lower edge of the display part and to a lower edge of the leg part. The stable part is disposed such that its lower edge is in abutment with an upper surface of the bottom part.

Abstract: An acoustic structure defining a cavity in which a sound wave propagates, wherein a first portion of the cavity substantially corresponding to a position of a node or an antinode of a standing wave generated in the cavity has an area different from an area of a second portion of the cavity except the first portion, the area being on a plane orthogonal to a direction of propagation of the sound wave.

Abstract: A display tool includes a display part, a back part, a stable part, a leg part, and a bottom part. The display part is disposed in its erected state. The back part has its upper edge connected to an upper edge of the display part and is disposed behind the display part such that a distance between the back part and the display part gradually increases from the upper edges to lower edges of the back part and the display part. The stable part protrudes downwardly along the back part from a portion of the lower edge of the back part. The leg part protrudes downward direction from the remaining portion of the lower edge of the back part at an angle less than an angle at which the back part slants. The bottom part is connected to a lower edge of the display part and to a lower edge of the leg part. The stable part is disposed such that its lower edge is in abutment with an upper surface of the bottom part.

Abstract: A measurement apparatus measuring a flight time of a search wave corresponding to a time after the search wave is emitted and before a reflected wave is received is provided. The measurement apparatus includes a transceiver, a memory portion, a sampling portion, a measurement portion, and a determination portion. The transceiver emits the search wave and receives the reflected wave. The sampling portion generates a sampling data and causes the memory portion to store the sampling data. The sampling portion includes a first processing unit and a second processing unit. The first processing unit causes the memory portion to store the sampling data as a first signal data. The second processing unit causes the memory portion to store the sampling data as a second signal data. The measurement portion measures the flight time and generates a measurement value of the flight time. The determination portion determines a sampling period.

Abstract: An acoustic structure defining a cavity in which a sound wave propagates, wherein a first portion of the cavity substantially corresponding to a position of a node or an antinode of a standing wave generated in the cavity has an area different from an area of a second portion of the cavity except the first portion, the area being on a plane orthogonal to a direction of propagation of the sound wave.

Abstract: A keyboard instrument includes: an instrument body; at least one speaker; and at least one acoustic pipe configured to collect a sound emitted from the at least one speaker and guide the sound to at least one sound emitting opening formed in a front face of the instrument body.

Abstract: A tubular body having an air flow passage, wherein an area of a cross section, in a direction perpendicular to a tube axis, of a space enclosed with an inner wall of the tubular body increases toward an open end thereof, wherein a curvature of the inner wall at an end portion of the tubular body near the open end is repeatedly increased and decreased along a circumferential direction of the inner wall, and wherein, when the inner wall in a cross section of the end portion in the direction perpendicular to the tube axis is viewed from the tube axis, a convex portion at which the inner wall protrudes in a direction away from the tube axis and a concave portion at which the inner wall is recessed in a direction toward the tube axis are repeatedly formed along the circumferential direction.

Abstract: A bass reflex port having a tubular shape for air flows, wherein an angle of a first inner radial line with respect to a reference plane including a center axis of the bass reflex port differs from an angle of a second inner radial line with respect to the reference plane, the first line being orthogonal to the center axis and passing a first characteristic point on an inner circumference of the bass reflex port in a first transverse cross section perpendicular to the center axis, the second line being orthogonal to the center axis and passing a second characteristic point corresponding to the first characteristic point and located on the inner circumference in a second transverse cross section perpendicular to the center axis, the first transverse cross section and the second transverse cross section differing form each other in position in a direction of extension of the center axis.

Abstract: A keyboard instrument includes: an instrument body; at least one speaker; and at least one acoustic pipe configured to collect a sound emitted from the at least one speaker and guide the sound to at least one sound emitting opening formed in a front face of the instrument body.

Abstract: A measurement apparatus measuring a flight time of a search wave corresponding to a time after the search wave is emitted and before a reflected wave is received is provided. The measurement apparatus includes a transceiver, a memory portion, a sampling portion, a measurement portion, and a determination portion. The transceiver emits the search wave and receives the reflected wave. The sampling portion generates a sampling data and causes the memory portion to store the sampling data. The sampling portion includes a first processing unit and a second processing unit. The first processing unit causes the memory portion to store the sampling data as a first signal data. The second processing unit causes the memory portion to store the sampling data as a second signal data. The measurement portion measures the flight time and generates a measurement value of the flight time. The determination portion determines a sampling period.

Abstract: A speaker includes: one or more speaker units; a cabinet accommodating the one or more speaker units; and a speaker net mounted on one of the cabinet and at least one of the one or more speaker units so as to cover a sound emitting surface of each of the at least one of the one or more speaker units. The speaker net includes: a frame surrounding the sound emitting surface of each of the at least one of the one or more speaker units; and a sheet member stuck to the frame to cover the sound emitting surface of each of the at least one of the one or more speaker units. The frame being formed with at least one through hole establishing communication between (i) a space between the frame and the cabinet and (ii) a space outside the speaker.