A method for disconnecting a generator from a power system when the generator and the thereto connected power system are non-synchronized. The extrusion die comprises an inside section, an outer peripheral section, and an outermost peripheral section; the width of the slit 14 disposed in the outer peripheral section is wider than the width of the slit disposed in the inside section; and when the surface roughness of the slits in the inside section and the outer peripheral section is 0. The representation of the audio signal is generated including the first and the second spectral coefficients. The shirt is then captured by the device and the shirt arms folded over.