Abstract: A predicted menstruation start date calculation apparatus includes a date information acquisition unit that acquires a number of menstrual cycle days and a number of high temperature phase days over multiple menstrual cycles of a woman, a type classification unit that performs classification into a specific type indicating that the number of menstrual cycle days is unstable and the number of high temperature phase days is stable, and into one or more types other than the specific type, and a calculation unit that calculates the predicted menstruation start date based on the classification by the type classification unit.

Abstract: A health management support system includes: a unit that receives two or more types of physical information measured by a user along with measurement time data; an analyzing unit for analyzing the relationship between the received two or more types of physical information in accordance with a predetermined rule; an advice generating unit that generates advice based on a result of the analysis; and an advice output unit that outputs the generated advice. The analyzing unit has a knowledge file that stores the predetermined rule, and an engine unit for executing the analysis. The advice generating unit generates the advice for notifying the user of a goal achievement level by analyzing the two or more types of physical information measured in a first predetermined period.

Abstract: An angle of rotation detector has a drive unit which supplies 90 degree phase shifted signals to a pair of stator coils and measures an analog output from a rotor coil in a resolver. A calculating device calculates the rotational angle of the resolver using the output of an analog to digital converter receiving the analog output of the rotor. In one embodiment, the calculating device performs a Fourier transform to compute the phase of a fixed frequency component contained in the output of the rotor coil. In another embodiment, the drive unit supplies signals wherein f(T/2+t)=-f(t) and the calculating device performs a Fourier transform using data from successive half periods of the drive waveform. In another embodiment, the output of the rotor is sampled at 1/4 period of an excitation signal from the drive unit and the calculating device determines the phase difference between the excitation signal and the rotor output.