| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an FSK signal detector for preventing reception characteristics from deteriorating, even if the wavelength of a frequency modulated to a frequency side that is lower than, for example, a central frequency of FSK signals becomes longer than a symbol time length. <P>SOLUTION: The output of a limiter amplifier 20 and FSK signals are inputted to a comparator 26; a correlator 30 including two systems for calculating the correlation of correlation signal trains G<SB>n</SB>-G<SB>2n</SB>, I<SB>n</SB>-I<SB>2n</SB>having prescribed regularity, adders 34, 42, absolute value converters 36, 44, and digital LPFs 38, 46 are successively connected to the output 28; and the output of the digital LPFs 38, 46 is computed by a difference calculator 50 for outputting demodulated data from a polarity determination section 54. <P>COPYRIGHT: (C)2007,JPO&INPIT |
