| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an FSK demodulation circuit wherein data are hardly misdiscriminated even in the presence of noise of a greater magnitude. <P>SOLUTION: The FSK demodulation circuit includes: an FM detector 12 that receives an FSK modulation signal and outputs an FM detection signal with an amplitude in response to the frequency of the FSK modulation signal; a synchronizing circuit 13 for detecting a data border from the detection signal outputted from the FM detector 12; an integral circuit 14 for newly integrating the detection signal outputted from the FM detection between preceding and succeeding data borders on the basis of the data borders detected by the synchronizing circuit; and a discrimination circuit 15 for discriminating the data by comparing a threshold value with an integral signal outputted from the integral circuit in a timing of the data borders. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
