| 摘要 |
<p>PURPOSE:To surely obtain the synchronism of communication signals, by demodulating data through the obtaining of frequency difference between the local frequency changed phase of a local frequency pattern signal according to the frequency difference between the frequency signal based on this data signa and the difference frequency signal. CONSTITUTION:An SS communication signal in a frequency hopping FH-spectrum scattering communication (SS communication), is inputted to the 1st mixer circuit 11. A local frequency pattern signal is inputted to this mixer circuit 11 from a frequency pattern generating circuit 12 to obtain the frequency difference between the pattern signal and the reception signal. The local frequency pattern signal is produced with an FH code indicating the frequency change according to the specified rule from an FH code generating circuit 13. Further, a synchronizing control circuit section (within dotted lined area) consists of the 1st circuit which performs square processing the discriminated output of the 2nd frequency discriminator 20 with a square circuit 21 and integrates it at an integrator INT 22, and of the 2nd circuit consisting of the 2nd frequency discriminator 20, limiter 24, inverting controller 25, and integrator 26, and the synchronism can surely be taken with organic effect of them.</p> |
