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1. Second, by means of wavelet multi-resolution analysis, separating modulating signal from radiated noise of naval ships has been simulated and realized with moderate and low signal-to-noise rate.

2. In the situation of modulating signal is square wave, the result of demodulation frequency is presented in imitation, and other parameter's jitter in this situation is also described.

3. Liner frequency modulating signal, phase coded and frequency coded signal are detected and recognized from all kinds of signals.

4. Detection of the photon rest mass is dependent on a rotating torsion pendulum method, where the precision of the experimental result is mainly dependent on the amplitude of the modulating signal.

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5. Frequency modulation(FM): the form of modulation in which the frequency of the carrier is varied in accordance with the instantaneous value of the modulating signal.

6. Arguments are given highlighting the link between the spectrum of the modulated signal and the invariant probability density function of the chaotic system generating the modulating signal.

7. To overcome the frequency offset between the mixing signal and modulating signal in PGC demodulation, an additional (A/D) channel in DSP system is used to sample the modulating signal.

8. According to the phase-detecting principle, a limited length of modulating signal and the including divide-modulation of modulating signal may be obtained.

9. Simulation shows that this method can accurately recover the modulating signal in low SNR circumstance.

10. Adopted the one to one communication of FSK audio frequency modulating signal in the communication of every subsystem and host monitor.

11. An all digital signal detecting system using C8051F060 as its core was completed. It can maintain the phase relation of sampling signal and modulating signal.