H - Electricity – 03 – C
Patent
H - Electricity
03
C
332/39
H03C 5/00 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1208712
13 ABSTRACT: "Circuit for recovering the carrier of an amplitude- and- phase-modulated input signal". A circuit for recovering the carrier of an ampli- tude- and- phase-modulated input signal (in particular QAM signal) is provided with a frequency-controlled oscilla- tor for producing the carrier, with a quadrature detector for supplying signals representing the amplitude of the input signal projected on two quadrature components P and Q of the carrier signal produced by the oscillator and for thus determining the modulation states of the input signal, and with correction means for forming a correction signal for the frequency control of the oscillator on the basis of output signals from a circuit which determines zones in the plane of the quadrature components P and Q. To provide for a satisfactory operation also in the presence of se- lective fading, the correction means comprise a weighting circuit connected to the zone-determining circuit for producing the correction signal in accordance with distinct weights allocated to the respective zones defined by the zone-determining circuit.
448668
Bonnerot Georges
Daout Michel
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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