Provided are an apparatus and method for coding and decoding a multi object audio signal with multi channel. In a laser machining method for removing remaining defects on a photomask by a method of laser machining, the remaining defects are removed by using a configuration in which irradiation with a laser beam is performed from below with a to-be-machined surface directed downward, and irradiation with a laser beam in an atmosphere containing a halogenated hydrocarbon gas. The amount of filler in the paper is measured, as is also the filler concentration or the total concentration in the white water or the stock. The printer system outputs a transfer request to the network server system in response to the print request. The recorded signal is convertedanalyzed by the frequency detector, and is compared to a known preprogrammed specific frequency vs. The retaining means may comprise a hole through the bar through which the retaining element, in the form of wire 30, 32, extends.