CPFSK SIGNAL GENERATING CIRCUIT AND CPFSK SIGNAL GENERATING METHOD

摘要

PROBLEM TO BE SOLVED: To perform phase sequence FSK by a simple control form without needing a complicated circuit configuration.;SOLUTION: When data are inputted, in a circulation type shift register SR-A on an upper stage, data of a logic "1" shifts to the right (positive direction) in synchronization with a clock. After that, if a data input changes, in a circulation type shift register SR-B on a lower stage, data of logic "1" inputted to a certain bit position through a gate circuit GATE starts cyclic shift to the left (negative direction) in synchronization with the clock. N-bit data outputted from a selector SEL are used to designate an address of a memory ROM for pseudo CPFSK wave generation.;COPYRIGHT: (C)2004,JPO