| 摘要 |
The invention concerns a device for recovering a carrier wave provided with a circuit for inhibiting dummy frequency hookings or acquisitions for phase-modulated digital signals in N states with a phase N=2P, device including a phase locking loop provided with demodulation, a voltage-controllable oscillator, a 90 DEG phase shifter, for the low-pass filtering of basic band signals X1(t) and Y1(t), a loop filter, for sampling the signals X1(t) and Y1(t) and having a sampling frequency Fe so that Fe>(2p+1¦n¦)/T where T is the reciprocal value of the modulation speed and, associated with this loop, a circuit for drawing up the filtered signals Sign Sin (2P PHI k) and Sign Cos (2P PHI k) required for detection of the direction of variation of the phase error, a phase/frequency comparator, loss of synchronization and hooking detection and an adaptive filter.
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