| 摘要 |
FIELD: radio and communications engineering; demodulation of frequency-modulated signals. SUBSTANCE: method involves delay of signal to be demodulated followed by relative phase detection of undelayed and delayed signals; delay is effected for time T= (n+k)/f,, where n+k= B/2Pm;; n is actual number, except for n = 0, for first half-cycle of phase detection characteristic; 0 ≅ k< 1 is relative coordinate of working point phase detection characteristic cycle; B ≅ PhD/2 is phase modulation index; PhD is phase detection range; m is frequency modulation percentage; fis carrier (mean) frequency. Method proposed, as distinct from previous one, involves additional introduction of phase shift PhDbetween undelayed and delayed signals at which relative coordinate of working point equals k+k, where k= PhD/2P.. EFFECT: facilitated procedure. |
