Circuit recovering the carrier of a signal modulated by amplitude steps and phase steps

摘要

the device for recovering the carrier of an input signal modulated by amplitude jumps and jumps (including phase modulation qam) is provided with a frequency controlled oscillator (3).to produce the carriera quadrature detector (1) for providing signals representing the amplitude of the input signal, on two elements p and q in the square of a signal provided by the oscillator and for theto determine the state of the input signal modulation and correction means for forming, a determining circuit (10) in the areas of the p and q components.a correction signal for the control of frequency of the oscillator.according to the invention, the correction means comprise a weighting circuit (12) which is to output the correction signal depending on the weight variable definition in different areasthe determination of the circuit areas.;application: transmission at high bit rate.