CPC Main Group Additional Only
H04S 2420/00 Techniques used stereophonic systems covered by H04S but not provided for in its groups
6 direct subcodes
Child Classifications
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- H04S 2420/01 Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
- H04S 2420/03 Application of parametric coding in stereophonic audio systems
- H04S 2420/05 Application of the precedence or Haas effect, i.e. the effect of first wavefront, in order to improve sound-source localisation
- H04S 2420/07 Synergistic effects of band splitting and sub-band processing
- H04S 2420/11 Application of ambisonics in stereophonic audio systems
- H04S 2420/13 Application of wave-field synthesis in stereophonic audio systems
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