CPC Subgroup
H04L 27/144 with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
Full Title
Modulated-carrier systems > Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) > Demodulator circuits; Receiver circuits > with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
2 direct subcodes
Child Classifications
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- H04L 27/148 using filters, including PLL-type filters
- H04L 27/152 using controlled oscillators, e.g. PLL arrangements
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- HUAWEI TECHNOLOGIES COMPANY CN 101,476
- QUALCOMM US 101,139
- SAMSUNG ELECTRONICS COMPANY KR 96,655
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
- LG ELECTRONICS KR 55,253
- HUAWEI TECHNOLOGIES COMPANY 54,181
- SONY CORPORATION JP 35,309
- ZTE CORPORATION CN 32,950
- INTEL CORPORATION US 27,533
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498