Abstract: A jigsaw includes a jigsaw main body, a handle, and a battery. The jigsaw main body includes a housing, a motor disposed inside the housing, and a battery mounting portion having a first mounting surface facing downward. The handle is disposed at an upper portion of the jigsaw main body and above the motor. The battery has a second mounting surface and supplies the motor with an electric power. The battery is slidable along the first mounting surface and mountable to the battery mounting portion with the first and second mounting surfaces facing each other.

Abstract: A signal processing technique the noise suppressing performance of which is more improved than conventional one is provided. A first component extraction unit 14 extracts a non-stationary component ^?S(A)(?, ?) derived from a sound coming from a target area and a stationary component ^?S(B)(?, ?) derived from an incoherent noise from a power spectrum density ^?S(?, ?) of the target area through processing of time average. A second component extraction unit 15 extracts a non-stationary component ^?N(A)(?, ?) derived from an interference noise and a stationary component ^?N(B)(?, ?) derived from an incoherent noise from a power spectrum density ^?N(?, ?) of a noise area.

Abstract: A jigsaw includes a motor, a rod having a blade attached thereto, a power transmission portion that converts rotation transmitted from the motor to vertical movement of the rod to vertically move the blade, and a counterweight that moves vertically in a direction of the vertical movement of the rod outside a range of the vertical, movement of the rod and the blade. At least a part of the counterweight is disposed so as to cross an extended line of a trajectory of the vertical movement of the rod. The counterweight moves vertically independently of the vertical movement of the rod which is produced by the power transmission portion.

Abstract: A signal processing technique the noise suppressing performance of which is more improved than conventional one is provided. A first component extraction unit 14 extracts a non-stationary component ??S(A)(?, ?) derived from a sound coming from a target area and a stationary component ??S(B)(?, ?) derived from an incoherent noise from a power spectrum density ??S(?, ?) of the target area through processing of time average. A second component extraction unit 15 extracts a non-stationary component ??N(A)(?, ?) derived from an interference noise and a stationary component ??N(B)(?, ?) derived from an incoherent noise from a power spectrum density ??N(?, ?) of a noise area.

Abstract: A sound enhancement technique that uses transfer functions ai,g of sounds that come from each of one or more positions/directions that are assumed to be sound sources arriving at each microphone to obtain a filter for a position that is a target of sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions. Each of the transfer functions ai,g is represented by sum of a transmission characteristic of a direct sound that directly arrives from the position determined by the direction i and the distance g and a transmission characteristic of one or more reflected sounds produced by reflection of the direct sound off an reflective object. A filter that corresponds to the position that is the target of sound enhancement is applied to frequency-domain signals transformed from M picked-up sounds picked up with M microphones to obtain a frequency-domain output signal.

Abstract: A jigsaw includes a motor, a rod having a blade attached thereto, a power transmission portion that converts rotation transmitted from the motor to vertical movement of the rod to vertically move the blade, and a counterweight that moves vertically in a direction of the vertical movement of the rod outside a range of the vertical, movement of the rod and the blade. At least a part of the counterweight is disposed so as to cross an extended line of a trajectory of the vertical movement of the rod. The counterweight moves vertically independently of the vertical movement of the rod which is produced by the power transmission portion.

Abstract: A cutting machine includes a housing accommodating a motor. In the housing, a cutting blade, an air duct, a dust collecting channel and a shutter member are provided. The cutting blade is operated with the driven motor to cut a workpiece, and the air duct allows cooling air generated by a cooling fan for the motor to be blown out onto a cutting place of the workpiece. The dust collecting channel has an opening at one end for serving as a dust collecting port located near the cutting place and an opening at the other end for permitting coupling of a dust collecting nozzle. The shutter member is movable between a closed position and an open position of the air duct and located in the open position in a normal state.

Abstract: A jigsaw includes a housing, a motor, a blade, a roller holder and a dust collection passage. The housing accommodates the motor. The blade driven by a motor protrudes downward from a front part of the housing and moves in a reciprocating manner to cut a workpiece. The roller holder is pivotally arranged under the housing and holds a roller that is arranged between a pair of side walls facing each other. The roller abuts on a rear part of the blade. The dust collection passage formed through the housing has a dust collection port that opens behind the roller holder. The jigsaw further includes a dust collection nozzle that has a vertically long opening formed on a front face and a rear face thereof respectively, the opening on the front face being connected to the dust collection port.

Abstract: A sound enhancement technique that uses transfer functions ai,g of sounds that come from each of one or more positions/directions that are assumed to be sound sources arriving at each microphone to obtain a filter for a position that is a target of sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions. Each of the transfer functions ai,g is represented by sum of a transmission characteristic of a direct sound that directly arrives from the position determined by the direction i and the distance g and a transmission characteristic of one or more reflected sounds produced by reflection of the direct sound off an reflective object. A filter that corresponds to the position that is the target of sound enhancement is applied to frequency-domain signals transformed from M picked-up sounds picked up with M microphones to obtain a frequency-domain output signal.

Abstract: A cutting machine providing excellent usability and facilitating installation of a battery pack is provided. The cutting machine includes a handle provided on a housing accommodating a motor, and a cutting blade operated by the motor driven by the battery pack which is a drive source. An insert receiving member is formed in the housing at the rear of the handle, and has an open top end allowing the battery pack to be inserted and installed therein from above. The insert receiving member is integrally joined to the handle.

Abstract: A cutting machine includes a housing accommodating a motor. In the housing, a cutting blade, an air duct, a dust collecting channel and a shutter member are provided. The cutting blade is operated with the driven motor to cut a workpiece, and the air duct allows cooling air generated by a cooling fan for the motor to be blown out onto a cutting place of the workpiece. The dust collecting channel has an opening at one end for serving as a dust collecting port located near the cutting place and an opening at the other end for permitting coupling of a dust collecting nozzle. The shutter member is movable between a closed position and an open position of the air duct and located in the open position in a normal state.

Abstract: A pure-water pipe for fuel cell has an innermost layer made of fluoro resin or polyolefin resin wherein an entire body of the pipe is made of resin and the pipe has a value of (a total thickness of the pipe)/(a thickness of the innermost layer) in a range of 1.1 to 40. The pure-water pipe further has a layer in the outside of the innermost layer which contains one of polyamide, polyester elastomer and polyolefin elastomer or a layer in the outside of the innermost layer which contains non-plastic polyamide. The pure-water pipe further has a low hydrogen-permeable layer in the outside of the innermost layer. The low hydrogen-permeable layer contains ethylene-vinyl alcohol copolymer, polymethaxyleneadipamide, or polybutylene naphthalate.