| 摘要 |
A frequency modulator comprising an oscillator the output frequency of which is dependent upon the amplitude of a modulating signal, modulating signal control means via which the modulating signal is fed to the oscillator to produce a corresponding frequency modulation on the output signal from the oscillator, a discriminator responsive to the frequency modulation for producing a corresponding amplitude signal, and a comparator responsive to the corresponding amplitude signal and to the modulating signal for providing a control signal which is fed back to control the gain provided by the signal control means so as to maintain constant the amplitude of the amplitude signal with respect to the modulating signal, whereby operation of the modulator is linearized.
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