CPC Main Group Additional Only
H04R 2227/00 Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
5 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H04R 2227/001 Adaptation of signal processing in PA systems in dependence of presence of noise
- H04R 2227/003 Digital PA systems using, e.g. LAN or internet
- H04R 2227/005 Audio distribution systems for home, i.e. multi-room use
- H04R 2227/007 Electronic adaptation of audio signals to reverberation of the listening space for PA
- H04R 2227/009 Signal processing in [PA] systems to enhance the speech intelligibility
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