Abstract: The spreading code generation apparatus of the present invention temporarily stores a spreading code string generated from one spreading code generator in memory (shift register or RAM). Then, after providing a necessary delay based on synchronization acquisition information output from a searcher, the code generation apparatus supplies the spreading code stored in memory to one of a plurality of correlators. This makes it possible to give a spreading code whose phase is adjusted to correspond to a specific path of multi-paths to the correlator.

Abstract: The spreading code generation apparatus of the present invention temporarily stores a spreading code string generated from one spreading code generator in memory (shift register or RAM).

Abstract: A surface electric potential sensor for detecting an electric potential on a surface of an object without contacting the surface. The sensor comprises a tuning fork having a base and legs formed of a single elastic body, piezoelectric vibrators respectively mounted on the legs, double-layer structure electrodes respectively provided on ends of the legs and each comprising an insulating substrate and a high conductive film, a supporting board, and a shield case which has a window for introducing therethrough lines of electric force radiated from the surface of the object. The tuning fork is mounted at the base on the upper surface of the supporting board. An electric circuit may be also mounted on the upper surface of the supporting board. As the tuning fork is vibrated by the piezoelectric vibrators, the electrodes moves so as to open and close the window of the shield case.