| 摘要 |
<p>PURPOSE:To apply control proportional to a frequency difference and to obtain a coincident frequency momentarily by adding information of phase margin to the conventional two-stage discrimination ways. CONSTITUTION:An oscillation circuit 2 outputs a frequency equal to a carrier frequency of a reception signal from an input terminal 1. A detection circuit 3 extracts phase information of the signals from an input terminal 1 and the circuit 2, outputs its quantization value, a recovery circuit 4 detects an optimum identification time, a decoding circuit 5 identifies the phase of the reception signal from the output of the circuits 3, 4 and outputs a code with a least phase difference as a decoded data. A detection circuit 7 quantizes an absolute value of the phase difference between the phase of the reception signal from the output of the circuits 3, 4 and the phase with a least phase difference to be sent and outputs the result. A control circuit 8 discriminates the state of 'phase lead' and 'phase lag' with respect to the sent phase similarly to the case with the circuit 7. When the phase is deviated to any state, the oscillating frequency of the circuit 2 is changed to cancel the deviation state.</p> |
