CPC Subclass Not Allocatable
H04S STEREOPHONIC SYSTEMS
Description
H04S covers the transmission, reception, and processing of stereophonic audio signals, including systems for creating, encoding, and reproducing sound with spatial dimension using multiple channels. This classification encompasses stereophonic microphone techniques, stereo signal encoding and decoding methods, and equipment for stereo broadcasting and reproduction. It includes systems for both analog and digital stereophonic transmission, as well as related technologies for surround sound and spatial audio reproduction.
6 direct subcodes
Child Classifications
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- H04S 1/00 Two-channel systems (H04S5/00, H04S7/00 take precedence)
- H04S 2400/00 Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S 2420/00 Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S 3/00 Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
- H04S 5/00 Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
- H04S 7/00 Indicating arrangements; Control arrangements, e.g. balance control
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