| 摘要 |
To maintain a cophasal relationship between two concurrently transmitted waves of the same high frequency derived from a common pilot oscillator, one of these waves being modulated by a low-frequency signal, a phase shifter in cascade with the modulator is controlled by a phase discriminator including a comparator with inputs receiving the two high-frequency waves. An analog multiplier driven by the low-frequency modulating signal converts an error signal from the phase comparator into a unipolar pulsating voltage which, upon integration, yields a control voltage adjusting the phase shifter to correct any relative phase displacement. |
