| 摘要 |
<p>The modulator consists of a frequency shift input and an automatic control circuit for locking the formed phase, comprising a reference oscillator (19), a variable frequency oscillator (15) and a phase detector (21) for comparing the output signals from the two oscillators. The modulator incorporates a compensation circuit (35) to at least attenuate the phase locking during the periods of frequency shift, based on an integrator to compensate for perturbation of modulation produced by the oscillator. The integrator is formed by an amplifier (41), resistances (R3, R4) and condensers (C3, C4).</p> |
