Abstract: The disclosure provides a spectrum calculation device and a spectrum calculation method, in which an inner product of a predetermined number of sampling data xn obtained by sampling and predetermined kernel functions is calculated, and spectra Spec(fi) for predetermined frequencies fi are calculated by calculating a square root of a sum of squares based on the calculated inner products. A difference between a latest data (xk, t+1)) among the predetermined number of sampling data upon calculation of the inner product and an oldest data (x(1, t)) among the predetermined number of sampling data in a previous calculation is respectively multiplied by first and second kernel functions, and an obtained value is added to a sine inner product value InSin(fi, t) and a cosine inner product value InCos(fi, t) obtained in the previous calculation, to update a sine inner product value InSin(fi, t+1) and a cosine inner product value InCos(fi, t+1).

Abstract: A printed wiring board includes a first outer surface, a second outer surface, and an electronic circuit. The second outer surface is opposite to the first outer surface. The electronic circuit includes at least one specific design circuit block and at least one common design circuit block. The at least one specific design circuit block is provided on the first outer surface and designed in accordance with a specification of a device to which the printed wiring board is applied. The at least one common design circuit block is for a common use regardless of the specification of the device. The at least one common design circuit block is provided on the second outer surface.

Abstract: A printed wiring board includes a first outer surface, a second outer surface, and an electronic circuit. The second outer surface is opposite to the first outer surface. The electronic circuit includes at least one specific design circuit block and at least one common design circuit block. The at least one specific design circuit block is provided on the first outer surface and designed in accordance with a specification of a device to which the printed wiring board is applied. The at least one common design circuit block is for a common use regardless of the specification of the device. The at least one common design circuit block is provided on the second outer surface.

Abstract: A DC voltage booster apparatus includes a booster coil, a first capacitor, a switching device, and a second capacitor. The booster coil includes a first end and a second end. The first end of the booster coil is connected to a DC power supply source. The second end of the booster coil is connected to a rectifier diode. The first capacitor is connected between the rectifier diode and a ground. The first capacitor includes a smoothing capacitor. The switching device is disposed between the second end of the booster coil and the ground. The second capacitor is connected in parallel with the rectifier diode.

Abstract: A DC voltage booster apparatus includes a booster coil, a first capacitor, a switching device, and a second capacitor. The booster coil includes a first end and a second end. The first end of the booster coil is connected to a DC power supply source. The second end of the booster coil is connected to a rectifier diode. The first capacitor is connected between the rectifier diode and a ground. The first capacitor includes a smoothing capacitor. The switching device is disposed between the second end of the booster coil and the ground. The second capacitor is connected in parallel with the rectifier diode.