TRANSMISSION

Introduced: September 1968

Description

H04B covers the technical systems and methods for transmitting signals, data, and information through various communication media and channels. This subclass encompasses transmission techniques across multiple frequency ranges, including radio transmission, wire-based transmission, optical transmission, and hybrid systems. It includes aspects such as signal modulation, amplification, filtering, impedance matching, and transmission line design, as well as technologies for managing bandwidth, noise, and signal quality. Adjacent classes address reception techniques (H04B15), specific communication protocols and applications (H04L-H04W), and individual component design.

Of 14 combined children, 10 exist in both systems.

4 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

7 shared codes have differing titles between IPC and CPC.

Child Classifications

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H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission +2 CPC IPC+CPC Available in IPC and CPC
H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication since 1990 IPC+CPC Available in IPC and CPC
H04B 11/00 Transmission systems employing ultrasonic, sonic or infrasonic waves IPC+CPC Available in IPC and CPC
H04B 13/00 Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00 +1 CPC IPC+CPC Available in IPC and CPC
H04B 14/00 Transmission systems not characterised by the medium used for transmission (details thereof H04B1/00) since 1985 +1 CPC IPC+CPC Available in IPC and CPC
H04B 15/00 Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) +1 CPC IPC+CPC Available in IPC and CPC
H04B 17/00 Monitoring; Testing (of line transmission systems H04B3/46; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves H04B10/07) since 1974 +1 CPC IPC+CPC Available in IPC and CPC
H04B 2201/00 Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00 2nd only +1 CPC CPC only CPC only
H04B 2203/00 Indexing scheme relating to line transmission systems 2nd only +1 CPC CPC only CPC only
H04B 2210/00 Indexing scheme relating to optical transmission systems 2nd only +7 CPC CPC only CPC only
H04B 2215/00 Reducing interference at the transmission system level 2nd only +3 CPC CPC only CPC only
H04B 3/00 Line transmission systems (combined with near-field transmission systems H04B5/00) IPC+CPC Available in IPC and CPC
H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems IPC+CPC Available in IPC and CPC
H04B 7/00 Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) +1 CPC IPC+CPC Available in IPC and CPC