CPC Subgroup
H04L 27/142 Full Title
Modulated-carrier systems > Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) > Demodulator circuits; Receiver circuits
H04L 27/142 Modulated-carrier systems > Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) > Demodulator circuits; Receiver circuits