H04J MULTIPLEX COMMUNICATION
Introduced: September 1968
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- MULTIPLEX COMMUNICATION
Description
H04J covers multiplex communication systems and techniques that enable simultaneous transmission of multiple signals or information streams over a single communication channel or medium. This includes time-division multiplexing (TDM), frequency-division multiplexing (FDM), code-division multiplexing (CDM), and wavelength-division multiplexing (WDM), along with associated synchronization, signaling, and channel allocation methods. The classification encompasses technologies for telecommunications networks, data transmission systems, and integrated communication infrastructures where efficient bandwidth utilization through signal combining is essential. Related switching, routing, and network management aspects specific to multiplex systems are also included, distinguishing this from broader electrical communication techniques covered in H04.
Additional Content
Limiting references
Optical monitoring arrangements, independent of the multiplexing method Selecting arrangements for multiplex systems
Application references
Use of multiplexing in transmission systems for measured values, control or similar signals Arrangements for transmission of digital information affording multiple use of the transmission path Systems for the simultaneous or sequential transmission of more than one television signal
Related Keywords
9 direct subcodes
Child Classifications
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- H04J 1/00 Frequency-division multiplex systems
- H04J 11/00 Orthogonal multiplex systems
- H04J 13/00 Code division multiplex systems
- H04J 14/00 Optical multiplex systems
- H04J 3/00 Time-division multiplex systems
- H04J 4/00 Combined time-division and frequency-division multiplex systems
- H04J 7/00 Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
- H04J 9/00 Multiplex systems in which each channel is represented by a different type of modulation of the carrier
- H04J 99/00 Subject matter not provided for in other groups of this subclass
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327