Abstract: An orthogonal frequency division multiplexing (OFDM) demodulating apparatus includes a delay profile creating section, a Fourier converting section, a pilot signal extracting section, a transmission path characteristic estimating section, an inverse Fourier converting section, and a window control section. In this case, the window control section creates a delay profile for defining a calculation range by leaving a path which exists at a same position in both the delay profiles created by the delay profile creating section and the inverse Fourier converting section and the number of times of detection which is equal to or higher than a threshold value and defines a higher threshold value for the path at a predetermined position from the position of the main path within the delay profile created by the inverse Fourier converting section than for the paths at the other positions.

Abstract: In an accelerometer supporting structure a housing is formed by a cylindrical portion and a flange, and a positioning part whose outer diameter is greater than that of the cylindrical portion and whose length is shorter than the length of the cylindrical portion in the axial direction of the cylindrical portion, is formed in the outer periphery of the cylindrical portion in contiguity to the flange. The inner peripheral surface of the cylindrical portion and the outer peripheral surface of the cylindrical sensor part are fixed to each other by a fixing ring disposed therebetween at an axial distance from the flange. The sensor supporting structure is adapted to be mounted on a mount with the cylindrical portion received in a circular hole of the mount and the flange resting on the mount about the marginal edge of the circular hole and fixed to the mount.