Methods are disclosed for determining mounting locations of ingots on a wire saw machine. The ballast starting circuit includes the inputs of the starting circuit connected to an inverter circuit, the starting circuit generating a pulse at the leading edge of each alternating half cycle of the inverter circuit output, the polarity of the pulse being the same as the polarity of each alternating half cycle of the inverter circuit output. Also disclosed are methods of forming enamel layers and corresponding coated substrates. The first color filter 16a is a filter that allows first wavelength band light to be selectively transmitted therethrough; the second color filter 16b is a filter that allows second wavelength band light in the longer wavelength side relative to the first wavelength band to be selectively transmitted therethrough. A denoised physiological signal is constructed in the first domain from at least one of the identified target subcomponents.