Compounds of the Formula I:wherein m, n, k, A, X, Y, Z, Ar, R1, R2, R3, and R4 are as defined herein. A determining portion determines the search area for each of the blocks of the current picture on the basis of the tendency information to cause the motion vector searching portion to search for the motion vector as the searched motion vector for each of the blocks of the current picture in the search area for each of the blocks of the current picture. The shaft having an open end operative to receive the shank. The head has a diameter corresponding at least approximately to the outer diameter of the thread and is provided with the inner notch for a tool. Each tuner comprises an image reject mixer connected to the tuner input by a single tracking filter, for example of the single-tuned type. The supply of power to the second function block section can be stopped when desired, while continuing the supply of power to the first function block section, thereby saving the power.